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L - ATTACHMG THE MANOMETER <br /> L. I -At this point, after the ALDP test, the interstice should still be holding vacuum. Maintain 20" of <br /> Vacuum and slowly open ball valve to let fluid into the interstice until it exits the venturi assembly. <br /> Visually check whether the fluid level reaches the top of the interstitial space. <br /> L.2 - Cut the barb & ball valve assembly free by cutting the tubing just below it and connect open <br /> end of tubing to the bottom of the primary Manometer. <br /> L.3 - Remove the Barb, Tubing & Combination gauge assembly from the test port fitting on the <br /> side of the sump. Install a threaded pipe plug into the open test port fitting and adjust Primary <br /> manometer bracket so the manometer is in a position clear of the sump cover. <br /> Remove Entire Gauge <br /> Assembly by backing <br /> off threaded barb fitting. <br /> Fig. L.7 <br /> (assembly. <br /> barb U Sensor Cable <br /> valve Cap assembly <br /> Install PVC Plug o- <br /> I <br /> I <br /> Connect Tubing to Continuous Monitoring <br /> Primary Manometer Interstitial & Leak <br /> Detection of Secondary <br /> Containment <br /> P-Traps OK since vacuum fill <br /> method leaves no room for air. <br /> LA - It is not uncommon for some interstitial fluid to be lost while connecting the tubing to the primary <br /> manometer. This is ok. Replace lost fluid by topping off manometer with interstitial fluid until the liquid level <br /> reaches just 2 inches below the top of manometer. <br /> L.5 - Hydrostatic Field Integrity Test - Mark the date and time of test and <br /> manometer level. Allow 1 hour to look for a change in level. No change in level or visible leaking means <br /> box passes test. <br /> L.6 - If interstitial test fluid changes its level more than 1/4", visually look for any signs of leaking around <br /> fittings both interior and exterior to sump. Pay special attention to field installed fittings. <br /> L.7 - If interstitial monitoring is required, install a California Listed Hydrostatic Sensor (LG-113) using the <br /> sensor manufacturer's fitting. Run sensor cable through the cap assembly (see Fig. L.7). Level sensor should <br /> be set to bottom of manometer. Follow your leak detector manufacturer's installation instructions. Cover the <br /> manometer with cap and fasten with wire and lead crimp seal. <br /> 21 ii-6401-DW-SP-10A <br />