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i Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities of the sump, add water to within 1 inch of the 6.6 Accelerated Precision Hydrostatic Test for Spill top of the sump. Buckets and Containment Sumps. Electronic preci- 2.Place the measuring stick vertically at the lowest sion test equipment can be utilized to test spill buckets point in the sump and extending above the water and containment sumps. It incorporates more sensitive level in the sump to allow for an accurate mea- equipment that permits a test to be conducted in a shorter surement to be taken. The location of the mea- Period of time.The procedures use the same test fluid and suring stick must remain the same for each water tests the same volume as other methods outlined in this level measurement. Document the initial water chapter.The manufacturer of the measurement equipment level measurement as measured from the bottom should specify the precision and duration of the test and of the sump.Alternative measurement methods the pass/fail criteria. However, pass/fail criteria should not be less stringent than those prescribed for the 1-hour may be used provided that the measurement to 1/16 (0.063)inch can be made. test in Section 6.5.7. 3.Take all precautions to prevent the water level The data sheet for Sections 6.2 or 6.5 may be used for this from being disturbed during the duration of the test.Refer to Appendix D. test. 6.7 Proper Handling of Test Liquids. Test liquids 4.After 1 hour, document the ending water level must be handled properly. Check with the AHJ regarding measurement. requirements. S.Upon completion of the test: -- • remove all water and properly dispose of it according to Section 6.7; • reinstall any interstitial monitoring sensors in their proper positions; • return the test boots or secondary containment fittings to their pre-test operating configurations; • inspect and reinstall all containment sump lids, r. " gaskets and covers. r Level FIGURE 6-7. The test fluid level in the tank sump must be at least 4 inches above the highest sump penetra- Electrical tion or sidewall seam. Conduit Product ' —• Piping y • i FIGURE 6-6. To prevent leakage, check all penetration fittings before adding water to ensure they make a tight seal. "�— FIGURE 6-8. Mea- suring sticks used 6.5.7 Pass/Fail Criteria. If the water level _ a' to measure the changes less than 1/8(0.125)inch,the containment I water level should sump passes the integrity test. ':''r be securely mount- ed to ensure that If the water level changes 1/8(0.125)inch or great- �n they do not move er, the containment sump fails the integrity test. during the test. pei.org