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

Warren Rogers Associates, Inc.

WRA Statistical Inventory Analysis, Version 5.1


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 0.05 gph.
This leak threshold is for evaluation purposes only.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds the leak threshold calculated from the data set. This leak threshold may be different than the above leak threshold.
Applicability Gasoline, diesel.
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:  (800) 972-7472



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