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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities • inspect and reinstall all containment sump If the water level changes 1/8(0.125)inch or great- lids, gaskets and covers. er, the containment sump fails the integrity test. 6.5.7 Pass/Fail Criteria. If the water level 6.6 Accelerated Precision Hydrostatic Test for Spill µ changes less than 1/8 (0.125)inch. the containment Buckets and Containment Sumps. Electronic preci- sump passes the integrity test. sion test equipment can be utilized to test spill buckets and containment sumps. It incorporates more sensitive equipment that A _ permits a test to b.,conducted in a shorter _ period of time.The procedures use the same text fluid and _ - tests the same volume as other methods outlined in this = chapter.The manufacturer of the measurement equipment should specify the precision and duration of the test and the pass/fail criteria. However, pass/fail criteria should not be less stringent than those prescribed for the 1-hour test in Section 6.5.7. - The data sheet for Sections 6.2 or 6.5 may be used for this test. Refer to Appendix D. 6.7 Proper Disposal of Test Liquids. Test liquids must be disposed of properly. Check with the AHJ regarding requirements for proper disposal. FIGURE 6-7. The test fluid level in the tank sump must be at least 4 inches above the highest sump penetra- tion or sidewall seam. 7. UST OVERFILL EQUIPMENT VERIFICATION9 INSPECTION : AND TESTING N Although the effectiveness of overfill prevention devices can be tested by attempting to overfill a UST with product and determining how well the device functions, this approach is not recommended. Any malfunction in the overfill prevention device could result in a product release that could result in a threat to public health and safety and environmental damage. Federal UST rules require that overfill prevention equip- ment automatically restrict flow or alert the transfer operator when the tank is no more than 90 percent full or shut off flow into a tank when it is no more than 95 percent full. Other alternatives to prevent overfills are the restriction of flow during a delivery 30 minutes prior to overfilling; alerting the operator 1 minute before overfill- ing may occur, or automatically shutting off flow into a tank so that none of the fittings located on top of the tank are exposed to product due to overfilling. The committee has written the recommended practices FIGURE 6-8. Measuring sticks used to measure the for automatic shutoff devices to reflect that the devices water level should be securely mounted to ensure that must be set to shut off flow when the tank is no more they do not move during the test. than 95 percent full, and flow restriction and overfill pei.org