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PEI/ RP1200 - 17 sump, where it can be easily observed or detected prevent water from entering the interstitial space by a sensor. of double-walled piping . Without these fittings , the integrity of the sump cannot be tested using This section describes a hydrostatic test method. this method . There are vacuum test methods available for con- tainment sumps . Consult the manufacturer before 5. If interstitial monitoring sensors are present performing a vacuum test . within the containment sumps , temporarily remove them before conducting the test. If the NOTE : Follow the manufacturer ' s instructions sensor is removed , reposition after testing to when testing the interstitial spaces of double- appropriate position according to the manufac- walled containment sumps . turer ' s instructions . 6 . If the containment sump is found to have cracks , 6 . 5. 2 ' Purpose . This section describes the prepa- loose parts or separation of any joints or penetra- ration and procedures to test the integrity of con- tion fittings , it is not considered to be liquid- tainment sumps to ensure that they do not leak. tight. This visually indicates a test failure . 6 . 5.3 Description of Test . The containment sump is filled to the proper level with water. The CAUTION : Water can damage electrical water level is measured at the beginning and end of connections . Ensure that there are no the test. components that can be damaged by the addition of water to the sump. If such 6 . 5. 4 Test Equipment . Test equipment shall components are present , take appropriate include: precautions when performing the test or • water ; use an alternative test method . • 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 . WaterElectrical Level Junction 1. Care should be taken when conducting the test 1 Box in the rain or during freezing weather condi- Electrical tions . ! Conduit 2 . Remove and properly dispose of any liquid and Product debris (leaves , sediment and trash) in the con- Piping tainment sump . 3 . Inspect the containment sump for damage . Examine all penetration fittings , conduits , junc- FIGURE 6-5 . The test fluid level in the under dispenser tion boxes , caps and risers (if present) , and side- containment (UDC) must be at least 4 inches above the wall seams for defects , damage or improperly highest sump penetration or sidewall seam. installed components . If there are loose com- ponents (e . g . , loose penetration fitting clamps or missing interstitial space caps) , correct these 6 . 5 . 6 Test Procedure . items before performing the integrity test. If 1. Begin the test by adding water to the sump to a there are items that must be repaired or replaced minimum of 4 inches above the highest sump (e . g . , deteriorated penetration fitting boots) , penetration or sump sidewall seam , whichever is notify the owner/operator and obtain approval higher. To compensate for sump deflection , the prior to proceeding with repairs . water must be allowed to settle a minimum of 4. Test boots or secondary containment termina- 15 minutes before taking the initial test measure- tion fittings must be present on the piping pen- ment. If the highest sump penetration or sump etrating the sump . During testing , these fittings sidewall seam is less than 4 inches from the top peLorg