Issue Date: November 22, 1995
Revision Date: September 11, 1998

Xerxes Corp.

Xerxes Trucheck Hydrostatic Monitoring System

INTERSTITIAL TANK TIGHTNESS TEST METHOD

Certification Leak rate of 0.1 gph with PD = 99% and PFA = 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.
Tank Capacity Maximum of 30,000 gallons.
Tank must be between 0 to 100% full.
Waiting Time None between delivery and testing.
Test Period Minimum of 10 hours.
Groundwater Depth to groundwater in tank excavation backfill must be determined before and after test.
When groundwater level is above bottom of tank but below top, test should be repeated if groundwater level increases by more than 7 inches during test.
When groundwater level is above tank, test should be repeated if groundwater level increases by more than 5 inches during test.

 

Xerxes Corp.

Evaluator:  Robert Plunkett, Ph.D.

7901 Xerxes Ave.

Tel:  (612) 338-0945

Minneapolis, MN  55431

Date of Evaluation:  01/07/93

Tel:  (952) 887-1890

 
 

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