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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 darn- 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 for double-walled piping systems. Leakage 3.Attach the test apparatus to the test port. 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 test apparatus. by a sensor. 5.Tf 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. DOTE: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- fails 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/[=ail Criteria. If the ending vacuum • water; level is 12 inches water column or greater,the spill • measuring stick that is accurate to within 1116 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 I-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 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 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- 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 improperly where they are secure and isolated from installed components. If there are loose corn- 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