Welcome to the State Water Resources Control Board Welcome to the California Environmental Protection Agency
Governor's Website Visit the Water Board Members Page
My Water Quality
Performance Report
UST Program - LG 113

UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: December 6, 2002

Tanknology - NDE

UST Ullage Test, Version U2 (Pressure Test)


Certification Leak rate of 0.1 gph with PD = 95.24% and PFA = 0%.
Leak Threshold A tank system should not be declared tight when the pressure decay trend equals or exceeds ± 0.016 psi/hr.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Other liquids may be tested after consultation with the manufacturer.
Tank Capacity Maximum ullage volume is 10,260 gallons.
Waiting time Minimum of 2 hours between delivery and testing.
Test Period Minimum of 30 minutes (after data trend has been established).
There must be no dispensing or delivery during test.
Test Pressure Total pressure of 4.0 psi must be applied at bottom of tank.
Temperature Ullage must be monitored during test, and a correction factor is applied to account for temperature changes.
If ullage temperature changes exceed 5 degrees F, test must not be conducted.
Groundwater Depth to groundwater in tank excavation backfill must be determined.
If groundwater is above product level, net pressure must be maintained at a minimum of 1 psi in the ullage during test.
Comments Not evaluated using manifolded tank systems.
Evaluated using diesel.
Tests only ullage portion of tank.
Product-filled portion of tank must be tested using a volumetric underfill test method.


Tanknology - NDE

Evaluator:  ADA Technologies, Inc.

8900 Shoal Creek Blvd. , Building 200

Tel:  (303) 792-5615

Austin , TX 78757

Date of Evaluation:  04/10/92

Tel:  (800) 800-4633



 | Home | Vendors: A - F | Vendors: G - M | Vendors: N - S | Vendors: T - Z | Method Index |

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable laws and regulations.
For full details, please refer to our expanded "DISCLAIMER" page.