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PEI/RP1200-17 pei.org18 sump, where it can be easily observed or detected by a sensor. This section describes a hydrostatic test method. There are vacuum test methods available for con- tainment sumps. Consult the manufacturer before performing a vacuum test. NOTE: Follow the manufacturer’s instructions when testing the interstitial spaces of double- walled containment sumps. 6.5.2 Purpose. This section describes the prepa- ration and procedures to test the integrity of con- tainment sumps to ensure that they do not leak. 6.5.3 Description of Test. The containment sump is filled to the proper level with water. The water level is measured at the beginning and end of the test. 6.5.4 Test Equipment. Test equipment shall include: • water; • measuring stick that is accurate to within 1/16 (0.063) inch and of sufficient length; • stopwatch or other time-measurement device capable of measuring a 1-second increment. 6.5.5 Preparation. 1.Care should be taken when conducting the test in the rain or during freezing weather condi- tions. 2.Remove and properly dispose of any liquid and debris (leaves, sediment and trash) in the con- tainment sump. 3. Inspect the containment sump for damage. Examine all penetration fittings, conduits, junc- tion boxes, caps and risers (if present), and side- wall seams for defects, damage or improperly installed components. If there are loose com- ponents (e.g., loose penetration fitting clamps or missing interstitial space caps), correct these items before performing the integrity test. If there are items that must be repaired or replaced (e.g., deteriorated penetration fitting boots), notify the owner/operator and obtain approval prior to proceeding with repairs. 4.Test boots or secondary containment termina- tion fittings must be present on the piping pen- etrating the sump. During testing, these fittings prevent water from entering the interstitial space of double-walled piping. Without these fittings, the integrity of the sump cannot be tested using this method. 5. If interstitial monitoring sensors are present within the containment sumps, temporarily remove them before conducting the test. If the sensor is removed, reposition after testing to appropriate position according to the manufac- turer’s instructions. 6.If the containment sump is found to have cracks, loose parts or separation of any joints or penetra- tion fittings, it is not considered to be liquid- tight. This visually indicates a test failure. CAUTION: Water can damage electrical connections. Ensure that there are no components that can be damaged by the addition of water to the sump. If such components are present, take appropriate precautions when performing the test or use an alternative test method. 6.5.6 Test Procedure. 1.Begin the test by adding water to the sump to a minimum of 4 inches above the highest sump penetration or sump sidewall seam, whichever is higher. To compensate for sump deflection, the water must be allowed to settle a minimum of 15 minutes before taking the initial test measure- ment. If the highest sump penetration or sump sidewall seam is less than 4 inches from the top Water Level Electrical Conduit Product Piping Electrical Junction Box FIGURE 6-5. The test fluid level in the under dispenser containment (UDC) must be at least 4 inches above the highest sump penetration or sidewall seam.