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UST Program - LG 113

UST Programs - LG 113

Issue Date: April 17, 2002
Revision Date: January 12, 2011


USTest, Inc.
(previously listed as Sound Products Manufacturing, Inc.)

UST 2001/P
(Ultrasonic Probe)


Certification Leak rate of 0.1 gph with PD = 97% and PFA = 0.6%
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 may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 20,000 gallons.
Minimum product level required is 15 inches (1 inch above lowest calibration rod).
Waiting Time Minimum of 4 hours between delivery and testing.
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 1 hour.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by an ultrasonic probe containing 5 temperature targets.
Targets located above the product surface are not used in data analysis.
If a test is to be conducted following a product delivery, the temperature difference between the product in the tank and the product delivered should not exceed 7.7 degrees F.
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 1 psi at bottom of the tank during test.
Calibration Probe must be checked regularly and, if necessary, calibrated in accordance with manufacturer's instructions.

System consists of an ultrasonic probe which interfaces with a micro processing unit.

Not evaluated using manifolded tank systems.

Tests only portion of tank containing product.

As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). 

Consistent testing at low levels could allow a leak to remain undetected.

EPA leak detection regulations require testing of the portion of the tank system which routinely contains product.


Southwest Environmental Services, Inc.

Ken Wilcox Associates

102 Abigayle Row

Tel: (816) 443-2494

Scott, LA 70508

Date of Evaluation: 07/11/01

Tel:  (337) 235-1184



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