UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: January 11, 2001

SIR Monitor
(originally listed as Environmental Management Technologies)

SIR Monitor

STATISTICAL INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)

Certification	Leak rate of 0.1 gph with PD = 99% and PFA = 1%. "If a method meets the requirement for detecting a leak rate of 0.1 gph, it will meet the requirement for 0.2 gph.", according to "Standard Test Procedures for Evaluating Leak Detection Methods: Statistical Inventory Reconciliation Methods", EPA/530/UST-90/007, June 1990, Section 7.2.3, page 30.
Leak Threshold	If the absolute value of the calculated leak rate (gain or loss) is less than the leak threshold and the minimum detectable leak rate is less than or equal to 0.1 gph, the test result is "pass." If the absolute value of the calculated leak rate is greater than or equal to the leak threshold, the result is "fail." If the minimum detectable leak rate exceeds 0.1 gph and the absolute value of the calculated leak rate is less than the leak threshold, the test result is "inconclusive."
Applicability	Gasoline, diesel. Other more viscous liquids may be tested after consultation with the vendor.
Tank Capacity	Maximum of 18,000 gallons.
Data Requirement	Minimum of 90 days of product level and flow through data are required before making the first evaluation. Following the first evaluation, subsequent evaluations are made based on minimum of 30 days of data.
Comments	Not evaluated using data from manifolded tank systems. Of 41 data sets submitted for evaluation, 5 were inconclusive. Median monthly throughput of tanks evaluated was 14,600 gallons. Leak rates of 0.05, 0.1, and 0.2 gph were used in evaluation. Data sets evaluated were supplied by vendor.

SIR Monitor	Evaluator: Nathan Adams,
P.O. Box 2791	Middle Tennessee State University
Murfreesboro, TN 37133	Tel: (615) 898-2644
Tel: (615) 895-2872	Date of Evaluation: 11/05/92

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