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UST Program - LG 113

UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: November 6, 1997

Western Environmental Resources

AES System II (Large Tanks)


Certification Leak rate of 0.1 gph with PD = 98.9% and PFA = 1.1%.
Leak Threshold 0.05 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, aviation fuel, fuel oil #4.
Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 75,000 gallons.
Tank must be minimum 100% full.
Waiting Time Minimum of 24 hours after delivery. Between "topping off" and beginning test, waiting time is computer-dictated by real-time analysis of level and temperature data and must be minimum of 1 hour.
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 4 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from the last 3 hours of test period data.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a minimum of 12 thermistors.
Groundwater Depth to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level must be adjusted to provide a minimum net pressure of 2 psi at bottom of the tank during test.
Calibration Level sensors must be calibrated before each test in accordance with manufacturer's instructions.
Thermistors must be checked annually and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments Not evaluated using manifolded tank systems.


Western Environmental Resources

Evaluator:  Ken Wilcox Associates

PO Box 37

Tel:  (816) 443-2494

Bakersfield, CA 93302

Date of Evaluation:  02/28/92

Tel:  (805) 326-0173


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