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UST Program - LG 113

UST Programs - LG 113

Issue Date: February 17, 1998
Revision Date: May 5, 2003


Warren Rogers Associates, Inc.

WRA Statistical Inventory Analysis, Version 5.2


Certification Leak rate of 0.1 gph with PD = 99.9% and PFA = 0.1%
"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 (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 36,000 gallons for single tank.
Maximum of 36,000 gallons cumulative capacity for manifolded tank systems with no more than 3 tanks in system.
Data Requirement Minimum of 30 days of product level and flow through data.
Comments 50% of data sets evaluated were from manifolded tanks systems.
82 data sets were submitted for evaluation.
All were analyzed with conclusive results.
Median monthly throughput of tanks evaluated was 52,207 gallons.
Median monthly throughput of separate manifolded tank system evaluation was 14,944 gallons. Leak rates of 0.05, 0.10, and 0.20 gph were used in evaluation.
All manifolded tank system data sets evaluated were supplied by evaluator.
A portion of the data sets drawn from the WRA Statistical Inventory Analysis Version 5.1 evaluation for tanks that were not manifolded, were provided by the vendor.


Warren Rogers Associates, Inc.

Evaluator:  Ken Wilcox Associates

747 Aquidneck Ave.

Tel :  (816) 443-2494

Middletown, RI 02840

Date of Evaluation:  12/08/97

Tel:  (401) 846-4747


E-mail: info@wraenviro.com  
URL: www.wraenviro.com  

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