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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities 6. 5 . 1 General . Containment sumps are liquid- tight structures designed to temporarily contain leaks or spills . In addition, containment sumps often serve as the leak detection monitoring loca- tion for double-walled piping systems . Leakage from the primary containment typically flows by gravity inside the secondary containment to the sump, where it can be easily observed or detected by a sensor. This section describes a hydrostatic test method . There are vacuum test methods available for con- tainment sumps. Consult the manufacturer before performing a vacuum test . NOTE : Follow the manufacturer ' s instructions when testing the interstitial spaces of double- walled containment sumps . 6. 5 .2 Purpose. This section describes the prep- aration and procedures to test the integrity of con- tainment sumps to ensure that they do not leak . 6 . 5 .3 Description of Test. The containment sump is filled to the proper level with water. The water level is measured at the beginning and end of the test. 6. 5.4 Test Equipment. Test equipment shall include , • water; • measuring stick that is accurate to within 1 / 16 (0. 063) inch and of sufficient length ; • stopwatch or other time-measurement device capable of measuring a 1 -second increment. 6 . 5 Containment Sump Integrity Testing. 6 . 5 . 5 Preparation. 1. Care should be taken when conducting the test CAUTION* Gaining access to the contain- in the rain or during freezing weather condi- ment sump requires removing the lid, tions . cover or dispenser panel that is in place to 2. Remove and properly dispose of any liquid and protect the equipment in the sump . These debris (leaves , sediment and trash ) in the con- components can be heavy. They may require special handling and more than tainment sump, one person to remove them. Use caution 3 . Inspect the containment sump for damage . when moving and replacing them when Examine all penetration fittings , conduits , junc- testingis complete . During the test, put tion boxes , caps and risers (if present) , and side- the covers and panels in a safe location wall seams for defects, damage or improperly where they are secure and Isolated from installed components . If there are loose com- vehicle and customer traffic . ponents (e. g . , loose penetration fitting clamps or missing interstitial space caps) , correct these items before performing the integrity test . If pei .org