Final California 2020 Integrated Report (303(d) List/305(b) Report)

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/28/2004 and 04/19/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

3060

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. Two of 11 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for iron is 0.3 mg/L.

Objective/Criterion Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142844

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life (Water Quality Control Plan for the San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142846

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 10 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-01-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

143023

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the water quality threshold for Iron. Although a total of 3 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-01-12 to 2011-04-06

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142607

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 35 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

143022

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 21 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142772

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142715

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 35 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142792

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142667

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142754

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142806

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 33 samples exceeded the water quality threshold for Iron. Although a total of 34 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142973

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-01-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

143008

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-04-06

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142791

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142827

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-04-06

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142990

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

143053

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142596

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 2 of the 22 samples exceeded the water quality threshold for Iron. Although a total of 23 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142575

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142701

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 23 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111281, Iron	Region 9
Rainbow Creek

LOE ID:

142789

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	111286	Region 9
Rainbow Creek

Pollutant:	Sulfates
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twelve lines of evidence are available in the administrative record to assess this pollutant. One hundred and ninety-nine of the 246 samples exceed the threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred and ninety-nine of 246 samples exceeded the threshold, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

3054

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. Six of 11 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for sulfate is 250 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146811

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 15 of 21 samples exceeded the water quality threshold for Sulfate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146736

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 8 of 10 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-01-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146795

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region NPDES data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

County of San Diego - Dept of Public Works. 2008. Quality Assurance Project Plan from Southern California Bight. ., Weston Solutions, Inc.. 2014. Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program., Wood. 2019. Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load., Weston Solutions, Inc.. 2019. Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring.

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146794

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 31 of 36 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146714

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 30 of 35 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146733

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 32 of 35 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146735

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

147056

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 17 of 22 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146792

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 27 of 35 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146750

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SMC Regional Watershed Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111286, Sulfates	Region 9
Rainbow Creek

LOE ID:

146771

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-04-06

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	111287	Region 9
Rainbow Creek

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Fifteen lines of evidence are available in the administrative record to assess this pollutant. Five hundred twenty eight of the 551 samples exceed the Basin Plan water quality objective for total dissolved solids. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Five hundred twenty eight of 551 of the samples exceed the Basin Plan water quality objective for total dissolved solids, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147308

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 37 of 42 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147215

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147263

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147116

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147259

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 49 of 51 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147162

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 69 of 71 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147378

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3046

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Nine of 9 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22, and all beneficial uses, the WQO for TDS is 750 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

These objectives apply to the lower portion of Murrieta Creek in the Wolf HSA (2.52) and the Santa Margarita River from its beginning at the confluence of Murrieta and Temecula Creeks, through the Gavilan HSA (2.22) and DeLuz HSA (2.21), to where it enters the Upper Ysidora HSA (2.13).

Guideline Reference:

Spatial Representation:

Samples were collected in Rainbow Creek at station 3, Oak Crest.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3047

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Nine of 9 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22, and all beneficial uses, the WQO for TDS is 750 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 6, Stage Coach.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3044

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Twenty of 20 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22, and all beneficial uses, the WQO for TDS is 750 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek at station 5, Riverhouse.

Temporal Representation:

Samples were collected 2-4 times per month from 03/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3043

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Twenty of 20 samples were in exceedance. One sample was also collected by RWQCB9 on 06/09/1998. This sample was in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22, and all beneficial uses, the WQO for TDS is 500 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 4, Willow Glen.

Temporal Representation:

Samples were collected 2-4 times per year from 03/2000 to 10/2000, and on 06/09/1998.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3048

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected from 1997 to 2000. Nine of 11 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22 and all beneficial uses, the WQO for TDS is 500 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

3045

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. One sample was collected and was in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters in HSA 902.22, and all beneficial uses, the WQO for TDS is 750 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

Spatial Representation:

Samples were collected at Rainbow Creek at station 2, Hines Nurseries.

Temporal Representation:

One sample was collected on 09/19/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147213

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 71 of 72 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147377

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147278

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 24 of 24 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147211

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147333

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147347

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147048

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147065

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147379

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147212

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147326

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147231

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147233

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147135

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147376

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147284

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147307

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147303

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147305

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147093

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147239

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147140

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147070

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147091

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147329

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147120

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147240

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147279

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111287, Total Dissolved Solids	Region 9
Rainbow Creek

LOE ID:

147073

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	127245	Region 9
Rainbow Creek

Pollutant:	Nitrogen
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	Agricultural Return Flows \| Nonpoint Source \| Nurseries \| Onsite Wastewater Systems (Septic Tanks) \| Other Urban Runoff \| Point Source
TMDL Name:	Rainbow Creek
TMDL Project Code:	47
Date TMDL Approved by USEPA:	03/22/2006
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the section 303(d) list under sections 2.2 and 4.2 of the Listing Policy. Under 4.2 of the Policy, a minimum of one line of evidence is needed to assess listing status. Thirty lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard.. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three hundred sixty of 368 samples exceeded the water quality threshold for the WARM/COLD beneficial use, 57 of 71 samples exceed the water quality threshold for the MUN beneficial use, and these exceed the allowable frequency listed in Table 4.2 of the Listing Policy. 4. The Rainbow Creek Nutrient TMDL was approved by the RWQCB in 2004 and approved by USEPA on 3/22/2006. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3039

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. One sample was collected and was in exceedance of the 10:1 N:P ratio.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters, enclosed bays and estuaries, coastal lagoons, and ground waters, and all beneficial uses, analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 2, Hines Nurseries.

Temporal Representation:

One sample was collected on 09/19/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3038

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Twenty-five of 25 samples, N:P ratios were in exceedance of the 10:1 ratio standard.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 5, Riverhouse.

Temporal Representation:

Samples were collected 2-4 times per month from 01/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144306

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 48 of 49 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Concentrations of nitrogen and phosphorus, by themselves or in combination with other nutrients, shall be maintained at levels below those which stimulate algae and emergent plant growth. A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total P. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144185

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144318

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144282

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 33 of 33 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2017-10-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144337

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 60 of 61 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144163

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144242

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2017-10-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144280

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 40 of 41 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144193

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

143949

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144283

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 21 of 21 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144341

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 41 of 41 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144186

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144082

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 45 of 46 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144324

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144347

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144301

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144252

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

143866

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144342

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144131

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

81110

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 8 samples exceed the criterion for Total Nitrogen as N.

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses (RWQCB, 2007). A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (RWQCB, 2007).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

21192

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

Three of the four samples collected at Rainbow Creek show excessive nitrogen concentrations according to results in California's Surface Water Ambient Monitoring Program Report, 2007. Samples were collected on January 2003, April 2003, May 2003, and September 2003.

Data Reference:

Monitoring data for Region 9

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses (RWQCB, 2007).

A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (RWQCB, 2007).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station (902SMRNB4).

Temporal Representation:

Samples were collected on January 2003, April 2003, May 2003, and September 2003.

Environmental Conditions:

QAPP Information:

Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3041

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Nine of 9 N:P ratios were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 6, Stage Coach.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3037

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2000. Eighteen of 25 N:P ratios were in exceedance. However, all phosphorus samples were in exceedance of the 0.1 mg/L standard, and if phosphorus levels meet the standard, all 25 nitrogen samples would be in exceedance. Nitrogen levels varied in the creek from 2.1 mg/L (October) to 23 mg/L (June).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek Station 4, Willow Glen.

Temporal Representation:

Samples were collected 2-4 times per month from 01/2000 to 10/2000

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3042

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB from 1997-2000. Six samples were collected, but only 2 samples were collected on the same days that phosphorus samples were collected. Only these two samples were used, because there is currently only the N:P ratio to evaluate nitrogen levels. None of 2 ratios were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected 1-2 times per year from 12/1997 to 03/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

3040

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 2002. For 4 of 9 samples, the N:P ratio exceeded 10:1. However, none of the phosphorus samples met standards, but if they had, all 9 of 9 nitrogen samples would have been considered to be in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 3, Oak Crest.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127245, Nitrogen	Region 9
Rainbow Creek

LOE ID:

144182

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition


DECISION ID	111285	Region 9
Rainbow Creek

Pollutant:	Phosphorus
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
TMDL Name:	Rainbow Creek
TMDL Project Code:	47
Date TMDL Approved by USEPA:	03/22/2006
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the CWA section 303(d) List under sections 2.2 and 4.1 of the Listing Policy. Under 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Thirty-two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 4.1 of the Policy. 2. The data used satisfies the data quantity requirements of section 4.1 of the Policy. 3. Five hundred and thirty of 571 samples exceeded the OBJECTIVE and these exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. The TOTAL MAXIMUM DAILY LOADS (TMDLS) FOR TOTAL NITROGEN AND TOTAL PHOSPHORUS IN THE RAINBOW CREEK WATERSHED was approved by USEPA on 02/09/2005. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146275

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 23 of 24 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146009

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 72 of 72 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145941

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 50 of 51 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146054

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 57 of 71 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146065

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 42 of 42 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145939

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146040

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 58 of 71 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145878

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145838

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145998

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145961

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145934

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 65 of 71 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145966

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146048

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146000

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145572

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 4 of 6 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145884

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145887

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146050

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145685

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145983

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145986

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

145995

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3033

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by the RWQCB in 2000. One sample was collected. It was in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters - streams and other flowing waters, and all beneficial uses, the WQO for total phosphorus is 0.1 mg/L. This appears to be desired goal in order to prevent plant nuisance in streams and other flowing waters; not to be exceeded more than 10% of the time.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek at Station 2, Hines Nurseries.

Temporal Representation:

One sample was collected on 09/19/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3055

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997-1999. Seven of 7 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters - streams and other flowing waters and all beneficial uses, the WQO for total phosphorus is 0.1 mg/L. This appears to be desired goal in order to prevent plant nuisance in streams and other flowing waters; not to be exceeded more than 10% of the time.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 02/1999.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3031

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB in 2000. Twenty-five of 25 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected in Rainbow Creek at Station 4, Willow Glen, near the Willow Glen Rd. Steel Bridge.

Temporal Representation:

Samples were collected 2-3 times per month from 01/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3035

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB in 2000. Nine of 9 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station 6, Stage Coach.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3034

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by the RWQCB in 2000. Nine of 9 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek Station 3, Oak Crest.

Temporal Representation:

Samples were collected 2-4 times per month from 08/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

3032

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB in 2000. Twenty-five of 25 samples were in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek at station 5, Riverhouse.

Temporal Representation:

Samples were collected 2-3 times per month form 01/2000 to 10/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

81109

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 4 of 8 samples exceed the criterion for Phosphorus.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The numeric target for phosphorus according to the Rainbow Creek TMDL is 0.1 mg/L. (San Diego Basin Plan)

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

146192

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111285, Phosphorus	Region 9
Rainbow Creek

LOE ID:

21193

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

All four samples collected at Rainbow Creek show excessive phosphorus concentrations according to results in California's Surface Water Ambient Monitoring Program Report, 2007. Samples were collected on January 2003, April 2003, May 2003, and September 2003.

Data Reference:

Monitoring data for Region 9

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

As described in San Diego Basin Plan; inland surface waters, bays and estuaries and coastal lagoon waters shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses (RWQCB, 2007).

From the Basin Plan: For inland surface waters-streams and other flowing waters, with all beneficial uses, the water quality objective for total phosphorus is 0.1 mg/L (RWQCB, 2007).

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek station (902SMRNB4).

Temporal Representation:

Samples were collected on January 2003, April 2003, May 2003, and September 2003.

Environmental Conditions:

QAPP Information:

Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.

QAPP Information Reference(s):


DECISION ID	111289	Region 9
Rainbow Creek

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139568

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region NPDES data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or produce detrimental physiological responses in, human, plant, animal, or aquatic life (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

The CCC of 20mg/L is a minimum value except where alkalinity is naturally lower, in which case the criterion cannot be lower than 25% of the natural level (USEPA National Recommended Water Quality Criteria Aquatic Life)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139711

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SMC Regional Watershed Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139595

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139613

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139622

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139739

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139607

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111289, Alkalinity as CaCO3	Region 9
Rainbow Creek

LOE ID:

139725

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition


DECISION ID	127693	Region 9
Rainbow Creek

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty lines of evidence are available in the administrative record to assess this pollutant. Fourteen of the 313 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Fourteen of the 313 samples exceed the water quality threshold, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184947

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185313

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 34 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184910

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 46 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185112

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 46 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184914

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

Regional Monitoring of Southern California's Coastal Watersheds

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185254

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 45 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184978

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 4 of 16 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185394

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185116

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184977

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184981

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184917

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 29 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185437

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184979

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184980

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184911

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185395

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

184912

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185107

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127693, Ammonia	Region 9
Rainbow Creek

LOE ID:

185270

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

Regional Monitoring of Southern California's Coastal Watersheds

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition


DECISION ID	115496	Region 9
Rainbow Creek

Pollutant:	Ammonia (Unionized)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Ten lines of evidence are available in the administrative record to assess this pollutant. Thirteen of the 219 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Thirteen of the 219 samples exceeded the threshold and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185403

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 24 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 72 samples were collected, 48 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The discharge of wastes shall not cause concentrations of un-ionized ammonia (NH3) to exceed 0.025 mg/l (as N) in inland surface waters, enclosed bays and estuaries and coastal lagoons (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185501

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 33 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 74 samples were collected, 41 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185598

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 0 of the 28 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 72 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185568

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 7 of the 20 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 24 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-12-15 to 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185507

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SMC Regional Watershed Monitoring data for Rainbow Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Ammonia as N, Unionized. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161).

Temporal Representation:

Date for this waterbody was collected over the date range 2015-06-25 to 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185566

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 3 of the 38 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 72 samples were collected, 34 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185579

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 33 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 74 samples were collected, 41 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185475

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 0 of the 25 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 43 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185453

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 1 of the 23 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 53 samples were collected, 30 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185309

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 0 of the 25 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 72 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185489

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 0 of the 25 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 72 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185556

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 6 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-01-12 to 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185515

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185282

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185496

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-01-12 to 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185476

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161).

Temporal Representation:

Date for this waterbody was collected over the date range 2015-06-25 to 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185287

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185481

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-22 to 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185575

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-12-15 to 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115496, Ammonia (Unionized)	Region 9
Rainbow Creek

LOE ID:

185482

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-09-21 to 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	111280	Region 9
Rainbow Creek

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

3064

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 15 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for chloride is 250 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

141007

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

141339

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

140964

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

141096

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

140934

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

140985

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

141245

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111280, Chloride	Region 9
Rainbow Creek

LOE ID:

141359

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chloride water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition


DECISION ID	115497	Region 9
Rainbow Creek

Pollutant:	Cyazofamid
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115497, Cyazofamid	Region 9
Rainbow Creek

LOE ID:

184850

Pollutant:

Cyazofamid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cyazofamid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Cyazofamid is the USEPA Aquatic Life Benchmark of <8.7 ug/L for an invertebrate (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115497, Cyazofamid	Region 9
Rainbow Creek

LOE ID:

184851

Pollutant:

Cyazofamid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cyazofamid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Cyazofamid is the USEPA Aquatic Life Benchmark of <8.7 ug/L for an invertebrate (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115495	Region 9
Rainbow Creek

Pollutant:	Cyprodinil
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115495, Cyprodinil	Region 9
Rainbow Creek

LOE ID:

184852

Pollutant:

Cyprodinil

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cyprodinil.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Cyprodinil is the USEPA Aquatic Life Benchmark of 8.2 ug/L for an invertebrate (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115495, Cyprodinil	Region 9
Rainbow Creek

LOE ID:

184853

Pollutant:

Cyprodinil

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cyprodinil.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Cyprodinil is the USEPA Aquatic Life Benchmark of 8.2 ug/L for an invertebrate (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115484	Region 9
Rainbow Creek

Pollutant:	Dithiopyr
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115484, Dithiopyr	Region 9
Rainbow Creek

LOE ID:

184855

Pollutant:

Dithiopyr

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Dithiopyr.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dithiopyr is the USEPA Aquatic Life Benchmark of 20 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-10-18

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115484, Dithiopyr	Region 9
Rainbow Creek

LOE ID:

184856

Pollutant:

Dithiopyr

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Dithiopyr.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dithiopyr is the USEPA Aquatic Life Benchmark of 20 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-10-18

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115498	Region 9
Rainbow Creek

Pollutant:	Fenhexamid
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115498, Fenhexamid	Region 9
Rainbow Creek

LOE ID:

184861

Pollutant:

Fenhexamid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenhexamid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenhexamid is the USEPA Aquatic Life Benchmark of 101 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-02-01

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115498, Fenhexamid	Region 9
Rainbow Creek

LOE ID:

184862

Pollutant:

Fenhexamid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenhexamid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenhexamid is the USEPA Aquatic Life Benchmark of 101 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-02-01

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115500	Region 9
Rainbow Creek

Pollutant:	Fluazinam
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115500, Fluazinam	Region 9
Rainbow Creek

LOE ID:

184867

Pollutant:

Fluazinam

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fluazinam.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fluazinam is the USEPA Aquatic Life Benchmark of 0.69 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-08-07 and 2016-08-07

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115500, Fluazinam	Region 9
Rainbow Creek

LOE ID:

184866

Pollutant:

Fluazinam

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fluazinam.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fluazinam is the USEPA Aquatic Life Benchmark of 0.69 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-08-07 and 2016-08-07

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115488	Region 9
Rainbow Creek

Pollutant:	Metalaxyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115488, Metalaxyl	Region 9
Rainbow Creek

LOE ID:

184872

Pollutant:

Metalaxyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Metalaxyl.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Metalaxyl is the USEPA Aquatic Life Benchmark of 1200 ug/L for a invertebrate (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115488, Metalaxyl	Region 9
Rainbow Creek

LOE ID:

184874

Pollutant:

Metalaxyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Metalaxyl.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

IRIS Reference Summary (Various Pollutants)

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for metalaxyl is 420 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 115488, Metalaxyl	Region 9
Rainbow Creek

LOE ID:

184873

Pollutant:

Metalaxyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Metalaxyl.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Metalaxyl is the USEPA Aquatic Life Benchmark of 1200 ug/L for a invertebrate (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115491	Region 9
Rainbow Creek

Pollutant:	Napropamide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115491, Napropamide	Region 9
Rainbow Creek

LOE ID:

184878

Pollutant:

Napropamide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Napropamide.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Napropamide is the USEPA Aquatic Life Benchmark of 1100 ug/L for a invertebrate (acute) and fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-06-08 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115491, Napropamide	Region 9
Rainbow Creek

LOE ID:

184877

Pollutant:

Napropamide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Napropamide.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Napropamide is the USEPA Aquatic Life Benchmark of 1100 ug/L for a invertebrate (acute) and fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-06-08 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	127774	Region 9
Rainbow Creek

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. Five of the 473 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Five of the 473 samples exceed the water quality threshold and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143940

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

144091

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 71 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

144049

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 70 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143897

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 23 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

144088

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143880

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 50 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143839

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 71 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143841

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127774, Nitrogen, Nitrite	Region 9
Rainbow Creek

LOE ID:

143862

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	111290	Region 9
Rainbow Creek

Pollutant:	Nonylphenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 111290, Nonylphenol	Region 9
Rainbow Creek

LOE ID:

144524

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nonylphenol.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2011-07-27 and 2011-07-27

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111290, Nonylphenol	Region 9
Rainbow Creek

LOE ID:

144520

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2011-07-27 and 2011-07-27

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):


DECISION ID	115489	Region 9
Rainbow Creek

Pollutant:	Oryzalin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115489, Oryzalin	Region 9
Rainbow Creek

LOE ID:

184879

Pollutant:

Oryzalin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oryzalin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oryzalin is the USEPA Aquatic Life Benchmark of 13 ug/L for a vascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115489, Oryzalin	Region 9
Rainbow Creek

LOE ID:

184882

Pollutant:

Oryzalin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oryzalin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oryzalin is the USEPA Aquatic Life Benchmark of 13 ug/L for a vascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115490	Region 9
Rainbow Creek

Pollutant:	Oxyfluorfen
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115490, Oxyfluorfen	Region 9
Rainbow Creek

LOE ID:

184883

Pollutant:

Oxyfluorfen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxyfluorfen.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oxyfluorfen is the USEPA Aquatic Life Benchmark of 0.29 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115490, Oxyfluorfen	Region 9
Rainbow Creek

LOE ID:

184884

Pollutant:

Oxyfluorfen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxyfluorfen.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oxyfluorfen is the USEPA Aquatic Life Benchmark of 0.29 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	111283	Region 9
Rainbow Creek

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2, a single line of evidence is necessary to assess listing status. Twenty-six line(s) of evidence are available in the administrative record to assess this pollutant (13 for COLD and 13 for WARM beneficial uses). Seventy of the 602 samples exceed the water quality threshold for the COLD beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Seventy of 602 samples exceeded the water quality threshold, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144915

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 17 of 51 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144947

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 11 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 5 of 28 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144953

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 91 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145050

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144537

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144778

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144392

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144420

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144797

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144565

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144698

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 57 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144833

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 28 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145033

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145048

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 22 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145049

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144383

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144414

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145052

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 5 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144718

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 13 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144926

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 57 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144933

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 12 of 51 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144950

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 10 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144996

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

144713

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111283, Oxygen, Dissolved	Region 9
Rainbow Creek

LOE ID:

145054

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 4 of 90 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	111279	Region 9
Rainbow Creek

Pollutant:	Oxytetracycline
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111279, Oxytetracycline	Region 9
Rainbow Creek

LOE ID:

145056

Pollutant:

Oxytetracycline

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxytetracycline.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oxytetracycline is the USEPA Aquatic Life Benchmark of 47450 ug/L for a fish (acute) for Oxytetracycline (hydrochloride salt).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111279, Oxytetracycline	Region 9
Rainbow Creek

LOE ID:

145058

Pollutant:

Oxytetracycline

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Oxytetracycline is the USEPA Aquatic Life Benchmark of 47450 ug/L for a fish (acute) for Oxytetracycline (hydrochloride salt).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):


DECISION ID	115492	Region 9
Rainbow Creek

Pollutant:	Pendimethalin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115492, Pendimethalin	Region 9
Rainbow Creek

LOE ID:

184887

Pollutant:

Pendimethalin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Pendimethalin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Pendimethalin is the USEPA Aquatic Life Benchmark of 5.2 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115492, Pendimethalin	Region 9
Rainbow Creek

LOE ID:

184888

Pollutant:

Pendimethalin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Pendimethalin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Pendimethalin is the USEPA Aquatic Life Benchmark of 5.2 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-12-19 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115493	Region 9
Rainbow Creek

Pollutant:	Prodiamine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115493, Prodiamine	Region 9
Rainbow Creek

LOE ID:

184900

Pollutant:

Prodiamine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Prodiamine.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Prodiamine is the USEPA Aquatic Life Benchmark of 1.5 ug/L for a invertebrate (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115493, Prodiamine	Region 9
Rainbow Creek

LOE ID:

184899

Pollutant:

Prodiamine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Prodiamine.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Prodiamine is the USEPA Aquatic Life Benchmark of 1.5 ug/L for a invertebrate (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115494	Region 9
Rainbow Creek

Pollutant:	Propiconazole
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115494, Propiconazole	Region 9
Rainbow Creek

LOE ID:

184903

Pollutant:

Propiconazole

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Propiconazole.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Propiconazole is the USEPA Aquatic Life Benchmark of 21 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115494, Propiconazole	Region 9
Rainbow Creek

LOE ID:

184904

Pollutant:

Propiconazole

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Propiconazole.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Propiconazole is the USEPA Aquatic Life Benchmark of 21 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115485	Region 9
Rainbow Creek

Pollutant:	Simazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115485, Simazine	Region 9
Rainbow Creek

LOE ID:

184905

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Simazine.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115485, Simazine	Region 9
Rainbow Creek

LOE ID:

184906

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Simazine.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	127394	Region 9
Rainbow Creek

Pollutant:	Specific Conductivity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Thirteen lines of evidence are available in the administrative record to assess this pollutant. Six of the 422 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six of 422 samples exceeded the threshold and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146744

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for specific conductance is 900 uS/cm (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146862

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146997

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146974

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146958

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146885

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 61 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2015-09-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146987

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146939

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146913

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 48 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2015-03-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146743

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146724

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146916

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 127394, Specific Conductivity	Region 9
Rainbow Creek

LOE ID:

146865

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2015-09-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	115486	Region 9
Rainbow Creek

Pollutant:	Trifluralin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 115486, Trifluralin	Region 9
Rainbow Creek

LOE ID:

184908

Pollutant:

Trifluralin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Trifluralin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Trifluralin is the USEPA Aquatic Life Benchmark of 1.9 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-02-01

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115486, Trifluralin	Region 9
Rainbow Creek

LOE ID:

184909

Pollutant:

Trifluralin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Trifluralin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The USEPA drinking water health advisory level for triallate is 4 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-02-01

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 115486, Trifluralin	Region 9
Rainbow Creek

LOE ID:

184907

Pollutant:

Trifluralin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Trifluralin.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Trifluralin is the USEPA Aquatic Life Benchmark of 1.9 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-02-01

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	111284	Region 9
Rainbow Creek

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2, a single line of evidence is necessary to assess listing status. Thirteen line(s) of evidence are available in the administrative record to assess this pollutant. Eighteen of the 645 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Eighteen of the 645 samples exceeded the water quality threshold, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145224

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145089

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 97 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145427

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

3056

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997-2000. None of the 14 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for pH is 6.5(minimum) to 8.5(maximum).

Objective/Criterion Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000. Samples were collected once on most sampling days, but were collected twice on 12/06/1999, 03/07/2000, and 06/01/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145419

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 96 samples exceeded the water quality threshold for pH.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145093

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145494

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145280

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 11 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145631

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region NPDES data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145150

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145380

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 95 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145363

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145220

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 10 of 32 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145212

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145257

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region NPDES data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145104

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 95 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145256

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145269

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 61 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145258

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145424

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145339

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145210

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145223

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145709

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145233

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145378

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111284, pH	Region 9
Rainbow Creek

LOE ID:

145296

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	126454	Region 9
Rainbow Creek

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Five line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Five of Nine benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. These data indicate that the waterbody is likely impaired for Benthic Community Effects. CSCI scores downstream of Margarita Glen Road do not exceed the threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Five of nine benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. Therefore, this water body is exceeding the water quality threshold for the protection of the WARM and/or COLD beneficial use. 4. Pursuant to section 3.9 of the Listing Policy, the water segment has associated pollutant(s) samples that exceed water quality objectives. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146040

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145986

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145983

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146054

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146000

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146192

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2011-06-21

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145685

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144282

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2017-10-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144082

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144185

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

143949

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144186

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144324

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144283

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144341

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-11-04 and 2015-09-03

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

143866

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144306

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-08-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144193

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-07-02

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

215702

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902M20161 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.4603 to 0.4603 .

Data Reference:

California Stream Condition Index Scores for the 2020 Integrated Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant or animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analysis of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board. Region 9 Basin Plan.

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.

Guideline Reference:

Spatial Representation:

Samples were collected from station 902M20161

Temporal Representation:

Samples were collected from 6/25/2015 to 6/25/2015.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

215703

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902M20173 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.4204 to 0.4204 .

Data Reference:

California Stream Condition Index Scores for the 2020 Integrated Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from station 902M20173

Temporal Representation:

Samples were collected from 6/7/2016 to 6/7/2016.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

215713

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902RCBWGR to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the threshold. CSCI scores were from 0.8464 to 0.8464 .

Data Reference:

California Stream Condition Index Scores for the 2020 Integrated Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from station 902RCBWGR

Temporal Representation:

Samples were collected from 4/30/2014 to 4/30/2014.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

215691

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902RCWGR to determine beneficial use support and the results are as follows: 1 of 4 samples exceeded the threshold. CSCI scores were from 0.7544 to 0.9547 .

Data Reference:

California Stream Condition Index Scores for the 2020 Integrated Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from station 902RCWGR

Temporal Representation:

Samples were collected from 2011 to 2015.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

215701

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902RNBI15 to determine beneficial use support and the results are as follows: 2 of 2 samples exceeded the threshold. CSCI scores were from 0.4858 to 0.5717 .

Data Reference:

California Stream Condition Index Scores for the 2020 Integrated Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from station 902RNBI15

Temporal Representation:

Samples were collected from 2011 to 2013.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

184868

Pollutant:

Imidacloprid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality standard for Imidacloprid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of Imidacloprid does not exceed 0.016 ug/L. (UC Davis Water Quality Criteria)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145049

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144698

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144915

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145048

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144778

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144718

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145033

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144797

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145050

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902RCWGRx)

Temporal Representation:

The samples were collected between the dates of 2010-10-07 and 2011-09-29

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144392

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144953

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

144950

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145966

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145878

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

145961

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146048

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126454, Benthic Community Effects	Region 9
Rainbow Creek

LOE ID:

146275

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2015-03-10

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):


DECISION ID	115499	Region 9
Rainbow Creek

Pollutant:	Fenpyroximate
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Two of the two samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of the two samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115499, Fenpyroximate	Region 9
Rainbow Creek

LOE ID:

184864

Pollutant:

Fenpyroximate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Fenpyroximate.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenpyroximate is the USEPA Aquatic Life Benchmark of 0.016 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-06-08

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 115499, Fenpyroximate	Region 9
Rainbow Creek

LOE ID:

184865

Pollutant:

Fenpyroximate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Fenpyroximate.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenpyroximate is the USEPA Aquatic Life Benchmark of 0.016 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2016-02-01 and 2016-06-08

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):


DECISION ID	115487	Region 9
Rainbow Creek

Pollutant:	Imidacloprid
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Six of the six samples exceed the water quality threshold for the WARM beneficial use, and six of the six samples exceed the water quality threshold for the COLD beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six of six samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115487, Imidacloprid	Region 9
Rainbow Creek

LOE ID:

184871

Pollutant:

Imidacloprid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality standard for Imidacloprid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of Imidacloprid does not exceed 0.016 ug/L. (UC Davis Water Quality Criteria)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 115487, Imidacloprid	Region 9
Rainbow Creek

LOE ID:

184868

Pollutant:

Imidacloprid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality standard for Imidacloprid.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of Imidacloprid does not exceed 0.016 ug/L. (UC Davis Water Quality Criteria)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (USGS-332455117090701)

Temporal Representation:

The samples were collected between the dates of 2015-08-26 and 2016-12-19

Environmental Conditions:

QAPP Information:

No QAPP Required

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	111282	Region 9
Rainbow Creek

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Two of the three samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of three samples exceed the threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111282, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 9
Rainbow Creek

LOE ID:

143895

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Quality Assurance Project Plan from Southern California Bight.

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111282, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 9
Rainbow Creek

LOE ID:

143834

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

Regional Monitoring of Southern California's Coastal Watersheds

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111282, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 9
Rainbow Creek

LOE ID:

143893

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Quality Assurance Project Plan from Southern California Bight.

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load


DECISION ID	111288	Region 9
Rainbow Creek

Pollutant:	Turbidity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Fourteen lines of evidence are available in the administrative record to assess this pollutant. One hundred and twenty three of the 633 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred and twenty three of 633 samples exceed the threshold and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147148

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147632

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

Regional Monitoring of Southern California's Coastal Watersheds

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147867

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 1 of 59 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148081

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 29 of 95 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147548

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 96 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147888

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 12 of 56 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148121

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 56 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147818

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 92 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147933

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 24 of 96 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147672

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147950

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 93 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148060

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 11 of 59 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147554

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 5 of 95 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148122

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 92 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147729

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148079

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 23 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147892

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147463

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147836

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC04)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147840

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

Regional Monitoring of Southern California's Coastal Watersheds

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147751

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147506

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20161)

Temporal Representation:

The samples were collected between the dates of 2015-06-25 and 2015-06-25

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147772

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 6 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147886

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 2 of 11 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148103

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Rainbow Creek to determine beneficial use support and results are as follows: 8 of 93 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147590

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC01)

Temporal Representation:

The samples were collected between the dates of 2011-01-12 and 2017-06-07

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147420

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-09-12

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147802

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan from Southern California Bight.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147016

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC10)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147150

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RVT02)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2018-04-11

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147121

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

148082

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (HST01)

Temporal Representation:

The samples were collected between the dates of 2010-12-15 and 2017-05-15

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147560

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC06)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147801

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Regional Monitoring of Southern California's Coastal Watersheds

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902M20173)

Temporal Representation:

The samples were collected between the dates of 2016-06-07 and 2016-06-07

Environmental Conditions:

QAPP Information:

Weston Solutions, Inc.. 2007. Regional Monitoring of Southern California's Coastal Watersheds., Weston Solutions, Inc.. 2019. Bioassessment Survey of the Stormwater Monitoring Coalition.

QAPP Information Reference(s):

QAPP Information Reference(s):

Bioassessment Survey of the Stormwater Monitoring Coalition

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147662

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (SMG05)

Temporal Representation:

The samples were collected between the dates of 2010-09-22 and 2018-09-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

147716

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (RBC-WGR)

Temporal Representation:

The samples were collected between the dates of 2017-07-06 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Quality Assurance Project Plan from Southern California Bight.

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency for NPDES Receiving Water Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for the County of San Diego's Inland Surface Water Monitoring Program

QAPP Information Reference(s):

Quality Assurance Project Plan Equivalency Los Penasquitos Watershed Management Area Sediment Load Total Maximum Daily Load

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

3049

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 1998. One sample was collected. It was not in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for turbidity is 5 ntu.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek at Willow Glenn Rd.

Temporal Representation:

One sample was collected on 06/09/1998.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111288, Turbidity	Region 9
Rainbow Creek

LOE ID:

81113

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for turbidity is 5 ntu.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 03/19/2005 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	86280	Region 9
Rainbow Creek

Pollutant:	Antimony
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the eight samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of eight samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86280, Antimony	Region 9
Rainbow Creek

LOE ID:

80846

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Antimony.

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony is .006 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	77698	Region 9
Rainbow Creek

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. Zero of the eighteen samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of eighteen samples exceeded the CRITERIA and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 77698, Arsenic	Region 9
Rainbow Creek

LOE ID:

80847

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for arsenic is 0.05 mg/L (Title 22 of the California Code of Regulations)..

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 77698, Arsenic	Region 9
Rainbow Creek

LOE ID:

3066

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of 10 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For all waters with a municipal beneficial use, the WQO for arsenic is 0.05 mg/L.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	86283	Region 9
Rainbow Creek

Pollutant:	Barium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the four samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of four samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86283, Barium	Region 9
Rainbow Creek

LOE ID:

80848

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Barium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium is 1 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/28/2004 and 05/19/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	86319	Region 9
Rainbow Creek

Pollutant:	Beryllium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the four samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of four samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86319, Beryllium	Region 9
Rainbow Creek

LOE ID:

80849

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The CA Department of Health Services maximum contamination level(MCL) thought to be protective of drinking water for beryllium is 4 ug/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/28/2004 and 05/19/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	69052	Region 9
Rainbow Creek

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the 11 samples exceed the Basin Plan water quality objective for Boron. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the 11 samples exceed the Basin Plan water quality objective for Boron, and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69052, Boron	Region 9
Rainbow Creek

LOE ID:

3065

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 11 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for Boron is 0.75 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	77550	Region 9
Rainbow Creek

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the Eight samples exceed the Water Quality Criteria for Cadmium. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Cadmium and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 77550, Cadmium	Region 9
Rainbow Creek

LOE ID:

75504

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cadmium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	84343	Region 9
Rainbow Creek

Pollutant:	Chromium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the Eight samples exceed the Water Quality Criteria for Chromium. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Chromium and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 84343, Chromium	Region 9
Rainbow Creek

LOE ID:

75505

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	85391	Region 9
Rainbow Creek

Pollutant:	Copper
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollution

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the Eight samples exceed the Water Quality Criteria for Copper. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Copper and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 85391, Copper	Region 9
Rainbow Creek

LOE ID:

75506

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 85391, Copper	Region 9
Rainbow Creek

LOE ID:

3063

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 11 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial uses, the WQO for copper is 1.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	69684	Region 9
Rainbow Creek

Pollutant:	Cyanide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. None of the six samples exceed the Basin Plan water quality objective for cyanide. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the six samples exceed the Basin Plan water quality objective for cyanide, and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69684, Cyanide	Region 9
Rainbow Creek

LOE ID:

3062

Pollutant:

Cyanide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 6 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For all waters with a municipal beneficial use, the WQO for cyanide is 0.2 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected 1-2 times per year from 12/1997 to 03/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	76946	Region 9
Rainbow Creek

Pollutant:	Fluoride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. None of 11 of the samples exceed the Basin Plan water quality objective for fluoride. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 11 of the samples exceed the Basin Plan water quality objective for fluoride, and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 76946, Fluoride	Region 9
Rainbow Creek

LOE ID:

3061

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 11 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for fluoride is 1.0 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	83693	Region 9
Rainbow Creek

Pollutant:	Lead
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the Eight samples exceed the Water Quality Criteria for Lead. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Lead and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 83693, Lead	Region 9
Rainbow Creek

LOE ID:

75507

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	69807	Region 9
Rainbow Creek

Pollutant:	Manganese
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence is necessary to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. One of the eleven total manganese samples and zero of the four dissolved manganese samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of eleven total manganese and zero of four dissolved manganese samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69807, Manganese	Region 9
Rainbow Creek

LOE ID:

81112

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL for manganese is 0.05 mg/L (Water Quality Control Plan for the San Diego Basin).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/28/2004 and 03/19/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 69807, Manganese	Region 9
Rainbow Creek

LOE ID:

3059

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. One of 11 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The water quality objective for manganese in Rainbow Creek is 0.05 milligrams/liter (mg/l) according to Basin Plan, Table 3-2 entitled, Water Quality Objectives. This concentration is not be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	69246	Region 9
Rainbow Creek

Pollutant:	Mercury
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a one line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the seven total mercury samples zero of four dissolved mercury samples exceed the OBJECTIVE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of seven total mercury and zero of four dissolved mercury samples exceeded the OBJECTIVE and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69246, Mercury	Region 9
Rainbow Creek

LOE ID:

81104

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego DPW data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceed the objective for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to elemental mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected 10/8/2004 - 4/15/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.

Line of Evidence (LOE) for Decision ID 69246, Mercury	Region 9
Rainbow Creek

LOE ID:

3058

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. None of the 7 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For all waters with a municipal beneficial use, the WQO for mercury is 0.002 mg/L.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected 1-3 times per year from 12/1997 to 03/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	83694	Region 9
Rainbow Creek

Pollutant:	Nickel
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the One samples exceed the Water Quality Criteria for Nickel. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of One samples exceeded the Water Quality Criteria for Nickel and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 83694, Nickel	Region 9
Rainbow Creek

LOE ID:

75508

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	86321	Region 9
Rainbow Creek

Pollutant:	Nitrate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the eight samples exceed the OBJECTIVE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of eight samples exceeded the OBJECTIVE and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86321, Nitrate	Region 9
Rainbow Creek

LOE ID:

81111

Pollutant:

Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The numeric objective for Nitrate according to the Rainbow Creek TMDL is 10.0 mg/L Nitrate as N. (San Diego Basin Plan)

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	77144	Region 9
Rainbow Creek

Pollutant:	Oil and Grease
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2, one line(s) of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. This conclusion is based on the fact that the data shows 2 out of 15 samples had "detectable levels" of oil and grease. There is no numeric water quality objective to compare the data to, to determine if water quality objectives are being met or exceeded. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. This conclusion is based on the fact that the data shows 2 out of 15 samples had "detectable levels" of oil and grease and this information is insufficient to determine with the confidence and power required by the Listing Policy. There is no numeric water quality objective to compare the data to, to determine if water quality objectives are being met or exceeded. A minimum of five samples is needed for application of table 3.2 when there is a numeric water quality objective. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 77144, Oil and Grease	Region 9
Rainbow Creek

LOE ID:

3057

Pollutant:

Oil and Grease

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 from 1997 to 2000. Fifteen samples were collected, 2 samples had detectable levels of oil and grease. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, waters shall not contain oils, greases, waxes, or other materials in concentrations which result in a visible film or coating on the surface of the water or on objects in the water, or which cause nuisance or which otherwise adversely affect beneficial uses.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	86356	Region 9
Rainbow Creek

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the eight samples exceed the criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of eight samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86356, Selenium	Region 9
Rainbow Creek

LOE ID:

81106

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.005 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 06/08/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	86357	Region 9
Rainbow Creek

Pollutant:	Silver
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the six samples exceed the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of six samples exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of sixteen samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 86357, Silver	Region 9
Rainbow Creek

LOE ID:

81107

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 0 of 6 samples exceed the criterion for Silver.

Data Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion maximum concentrations for silver to protect aquatic life in freshwater (1-hour average). The silver criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Old Highway 395 - 902RBC04, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/08/2004 and 07/05/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	75441	Region 9
Rainbow Creek

Pollutant:	Surfactants (MBAS)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One lines of evidence is available in the administrative record to assess this pollutant. None of the ten samples exceed the Basin Plan water quality objective for surfactants. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the ten samples exceed the Basin Plan water quality objective for surfactants, and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 75441, Surfactants (MBAS)	Region 9
Rainbow Creek

LOE ID:

3053

Pollutant:

Surfactants (MBAS)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data were collected from 1997-2000 by RWQCB9. None of the 10 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for MBAS is 0.5 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):


DECISION ID	69687	Region 9
Rainbow Creek

Pollutant:	Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the ten samples exceed the Basin Plan water quality objective for zinc. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the ten samples exceed the Basin Plan water quality objective for zinc, and this sample size is insufficient to determine with the power and confidence of the listing policy the applicable beneficial use support rating. At least 16 samples are required to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69687, Zinc	Region 9
Rainbow Creek

LOE ID:

3052

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected from 1997 to 2000. None of the 10 samples were in exceedance. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for zinc is 5.0 mg/L.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

Samples were collected on a quarterly basis from 12/1997 to 06/2000.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 69687, Zinc	Region 9
Rainbow Creek

LOE ID:

75509

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Rainbow Creek was collected at 2 monitoring sites [ Rainbow Creek at Stage Coach Lane - 902SMG06, and Rainbow Creek at Stage Coach Lane - 902SMG06]

Temporal Representation:

Data was collected between 10/13/2004 and 6/8/2005.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP was followed.

QAPP Information Reference(s):

Quality Assurance Project Plan from the CRG Marine Laboratories and MACTEC Flow Monitoring Sampling SOP.


DECISION ID	68848	Region 9
Rainbow Creek

Pollutant:	Aluminum
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. Three of the five samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of five samples exceed the GUIDELINE and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 68848, Aluminum	Region 9
Rainbow Creek

LOE ID:

3067

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 1999. One sample was collected and was equal to the standard. (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Aluminum is 0.2 mg/L.

Objective/Criterion Reference:

Data for Metals, Nutrients, and Inoganics from the County of San Diego Rainbow Creek, 2004-2005.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Rainbow Creek near Fallbrook.

Temporal Representation:

One sample was collected on 12/06/1999.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 68848, Aluminum	Region 9
Rainbow Creek

LOE ID:

80845

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed County of San Diego Dept. of Public Works data for Rainbow Creek to determine beneficial use support and results are as follows: 3 of 4 samples exceed the criterion for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference: