UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: May 5, 2003

Warren Rogers Associates, Inc.

WRA Statistical Inventory Analysis, Version 5.1

STATISTICAL INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)

Certification	Leak rate of 0.1 gph with PD = 99.98% and PFA = 0.02%. "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 (0.2 gph for the 0.2 gph test), 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 (0.2 gph for the 0.2 gph test) 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 30 days of product level and flow through data.
Comments	Not evaluated using manifolded tank systems. Of 41 data sets submitted for evaluation, all were analyzed with conclusive results. Median monthly throughput for tanks evaluated was 1000 gallons. Leak rates of 0.05, 0.1, and 0.20 gph were used in evaluation. A portion of data sets evaluated was supplied by vendor.

Warren Rogers Associates, Inc.	Evaluator: Ken Wilcox Associates
747 Aquidneck Ave.	Tel : (816) 443-2494
Middletown, RI 02840	Date of Evaluation: 12/18/90
Tel: (401) 846-4747
E-mail: info@wraenviro.com
URL: www.wraenviro.com

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