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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities 2 . Clean the spill bucket and examine it for dam- 6 . 5.1 General . Containment sumps are liquid- age. Make sure that it is free of cracks, loose tight structures designed to temporarily contain parts or separation of the bucket from the fill leaks or spills . In addition, containment sumps pipe. If the spill bucket is damaged notify the often serve as the leak detection monitoring loca- owner/operator. tion foil double-walled piping systems. Leakage 3 . Attach the test apparatus to the test porta from the primary containment typically flows by gravity inside the secondary containment to the 4 . Connect the line from the vacuum source to the sump, where it can be easily observed or detected lest apparatus. by a sensor. 5. If the spill bucket is found to have cracks , loose This section describes a hydrostatic test method. parts or separation of the bucket from the fill There are vacuum test methods available for con- pipe, it is not considered to be liquid- tight. This tainment sumps. Consult the manufacturer before visually indicates a test failure. performing a vacuum test. 6. 4. 5 Test Procedure. NOTE : Follow the manufacturer ' s instructions 1 . Slowly apply a vacuum of 15 inches water when testing the interstitial spaces of double,, column to the spill-bucket interstitial space and walled containment sumps , close the control valve. If a 15 -inch water col- umn vacuum cannot be attained, the spill bucket 6. 5. 2 Purpose : This section describes the prep,, falls the test . See Appendix B for pressure and aration and procedures to test the integrity of con- vacuum conversions , tainment sumps to ensure that they do not leak. 2. Start the time-measurement device and record 6. 5.3 Description of Test . The containment the initial vacuum level shown on the gauge. sump is filled to the proper level with water. The 3 . After 1 minute, record the ending vacuum level . water level is measured at the beginning and end of the test. Upon completion of the test, release the vacuum, remove the test apparatus and restore the spill 6 . 5.4 Test Equipment. Test equipment shall bucket to its normal operating condition . include : 6. 4 .6 Pass/Fall Criteria . If the ending vacuum water; level is 12 inches water column or greater, the spill measuring stick that is accurate to within 1/ 16 bucket passes the test. (0 .063) inch and of sufficient length ; If the ending vacuum level is less than 12 inches stopwatch or other time-measurement device water column, the spill bucket fails the test@ 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 , lions , cover or dispenser panel that is in place to protect the equipment in the sump . These 2 • Remove and properly dispose of any liquid and components can be heavy. They may debris (leaves , sediment and trash ) in the con- require special handling and more than lainmenl 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- testing Is 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 impropez•ly 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