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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities NOTE: If the fill cap is not included in the spill bucket test and/or the cap is not tight, it could be the source of potential fuel contami- nation from water intrusion. NOTE: Before permanently plugging, ensure that local regulations allow the drain valve to be permanently plugged. 6.2.5 Test Procedure. 1. Add water to the spill bucket to a level within 1.5 inches of the top of the spill bucket. Allow the water to settle for 5 minutes before the initial water level measurement is taken. 2. Place the measuring stick vertically at the lowest point in the spill bucket and extending above the water level to allow for an accurate measure- ment to be taken. The location of the measuring stick must remain the same for each water level measurement. Document the initial water level measurement as measured from the bottom of the spill bucket. Alternative measurement meth- ods may be used provided that measurement to 1/16 (0.063) inch can be made. 3. 'Fake all precautions to prevent the water level from being disturbed during the duration of the test. 4. After 1 hour, document the ending water level measurement. S. Upon completion of the test, remove and dis- pose of the water according to Section 6.7, and dry the inside of the spill bucket before returning it to service. 6.2.6 Pass/Fail Criteria. If the water level has dropped less than 1/8 (0.125) inch, the spill bucket passes the integrity test. If the water Ievel has dropped 1/8 (0.125) inch or greater, the spill bucket fails the integrity test. 6.3 Spill Bucket Integrity Testing — Vacuum Test Method. 6.3.1 Purpose. This method is used to test the integrity of single -walled spill buckets or the pri- mary containment of secondarily contained spill buckets. 6.3.2 Description of Test. Using a specially equipped test cover, a partial vacuum is applied to the spill bucket. The vacuum level is monitored for a l -minute period. 6.3:3 Test Equipment. Test equipment shall include: vacuum test apparatus (The test apparatus may be available from the spill bucket manufacturer. It includes an air pressure regulator, a vacuum source, a vacuum gauge with a minimum 0-50 inch water column range and a control valve. The control valve is used to adjust the vacuum level.); • test cover (The cover is equipped with a test fit- ting.); • plumber's plug (appropriate size, if used); • stopwatch or other time -measurement device capable of measuring a 1 -second increment; • gasketing material (The purpose of the Bas- keting material is to provide an air -tight seal between the test cover and the spill bucket.). 0 - 50'Water column Vacuum Vacuum Gauge Source Control Valve Plumbers Plug In Tank Riser Pipe FIGURE 6-2. The cover must make a tight seal with the spill bucket to prevent leakage when the vacuum is pulled during the test. WARNING: Use only an air -operated vac- uum source or a vacuum pump pow- ered by an explosion -proof motor. Vacuum pumps with electric motors that are not pei.org 4)