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rPEIlRP1200-12 pipe, it is not considered to be liquid -tight. This visually indicates a test failure. 6.3.5 Test Procedure. 1. Slowly apply a vacuum of 30 inches water column to the spill bucket and close the valve. If a 30 -inch water column vacuum cannot be attained, the spill bucket fails the test. See Appendix B for pressure and vacuum conver- sions. 2. Start the time -measurement device and record the initial vacuum level shown on the gauge. 3. After 1 minute, record the ending vacuum level. Upon completion of the test, release the vacuum, remove the test apparatus and the Basketing mate- rial from the spill bucket and replace the original cover. FIGURE 6-3. The vacuum test method can detect a spill bucket leak by measuring the change in vacuum level during the test. 6.3.6 Pass/Fall Criteria. If the ending vacuum level is 26 inches water column or greater, the spill bucket passes the test. If the ending vacuum level is less than 26 inches water column, the spill bucket fails the test. and secondary containment. The vacuum level is monitored for a 1 -minute period. 6.4.3 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 0.30 inch water column range, a test fitting and a control valve. The control valve is used to adjust the vacuum level.); • stopwatch or other time -measurement device capable of measuring a 1 -second increment. WARNING. Use only an air -operated vacu- um source or a vacuum pump powered by an explosion -proof motor. Vacuum pumps with electric motors that are not explo- sion -proof may ignite flammable vapors. If a portable air compressor is used, it should be located at least 20 feet away from the venturl-eductor or outside any Class I, Division 1 area. 6.4 Double -Walled Spill Bucket Integrity Testing -- FIGURE 6-4. Check lines and connections to ensure Vacuum Test Method. that they are leak -tight before starting the test. 6.4.1 Purpose. This method is used to test the integrity of the primary and secondary containment of the double -walled spill bucket. 6.4.2 Description of Test. A partial vacuum is applied to the interstitial space between the primary 0 peLorg 6.4.4 Preparation. 1. Remove and properly dispose of any liquid and debris (leaves, sediment and trash) in the spill bucket.