Issue Date: 6/29/20


Version 1.0 Monthly Monitoring (0.2 gal/hr leaks and 0.1 gal/hr leaks)


Certification Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.0%.
Leak rate of 0.1 gph with PD = 99.0% and PFA = 0.01%.
Leak Threshold 0.1 gph for leak rate of 0.2 gph.
0.05 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, diesel. 
Tank Capacity Maximum of 45,000 gallons.
Data Requirement Minimum of 21 days of usable product level and flow through data are required.
Comments This method is used as a monthly monitoring method.
This method cannot be used as a tightness test.
Evaluated for use on a manifolded tank system not to exceed 45,000 gallons that contains no more than 4 tanks in its system.
Maximum throughput is 127,068.9 gallons.
70% of data sets evaluated were from manifolded tank systems.
73% of data sets evaluated used data collected by Automatic tank gauges.
Of 100 data sets submitted for evaluation, all were analyzed with conclusive results.


David N. Brevard

Evaluator: Ken Wilcox Associates

ACCENT Environmental Services, Inc.

1125 Valley Ridge Dr.

PO Box 3289

Grain Valley, MO 64029

Lufkin, TX 75903

  Tel: (816) 443-2494

Email: Date of Evaluation: 09/01/2014
Tel: (936)225-5000  

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