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Double-Wall •- D9,D10,E <br /> Figure D9-3 6. Wait at least 30 minutes, if the water level in the <br /> Air Supply Air Supply collar does not drop more than W,the tank is <br /> Valve Closed considered acceptable and leak free. <br /> Reservoir 7. If the level drops more than the '/,", ensure that inlet <br /> and outlet pipe caps or plugs and collars are not <br /> leaking,then refill the tank and retest. <br /> 8. After the tank is proven to be watertight, remove the <br /> water in the tank to below the pipe invert. <br /> 5psig 5psig 5psig 9. For additional testing instructions for a Non <br /> Petroleum tank, refer to Supplemental Documents <br /> (Section R). <br /> 16. With all compartments under pressure, cover <br /> fittings and manway(s)with soap solution and E. EXCAVATIONAND TANK CLEARANCE <br /> inspect. <br /> 17. After completing air test, release pressure. <br /> 18. Remove all gauges, valves, and hose assemblies. Do not enter the tank excavation unless in <br /> 19. Replace and tighten fitting plug(s). compliance with OSHA regulations. Follow OSHA <br /> 20. Replace the plastic vent plug in the open fittings. guidelines for tank excavation. <br /> Collapsing excavation walls can cause injury <br /> D10. WATER TEST FOR or death. <br /> • STABLE EXCAVATIONS <br /> (NON PETROLEUM TANKS) • When your excavation is in stable, undisturbed soil; <br /> use the minimum spacings <br /> ` • (per Figure E-1 and Table E-2). <br /> If the tank is to be water tested,It must be supported <br /> by backfill on all sides to the top of the tank. Failure Figure E-1 <br /> �..� to do so may result in tank damage. B AA <br /> These instructions are for tanks that require a post <br /> installation water test. <br /> Perform the following in the order listed. <br /> 1. Comply with the requirements of Section C. <br /> 2. Tanks may only be water tested if the backfill is at // <br /> tank top (see Figure D10-1). B B <br /> Figure D10-1 / ~� <br /> Fill 2"into \\ \\ \\ \\ ` Stable Soil \\ \ \\ \ <br /> Access Collar <br /> TABLE E-2 <br /> 4',6,8'Diameter Tanks <br /> Water Minimum w/12"x 12"CSI Deadmen <br /> A 18"(457mm) 24"(womm) <br /> Backfill : B 18"(457mm) 24"(610mm) <br /> 10'Diameter Tanks <br /> Minimum w/18"x8"CSI Deadmen <br /> 3. Expose tank penetrations on tank top by A 18"(457mm) 36"(914mm) <br /> temporarily removing backfill. B 24"(610mm) 24"(610mm) <br /> 4. So water does not exit the inlet/outlet pipe, install a 12'Diameter Tanks <br /> turned up elbow or plug. Minimum w!18"x8"CSI Deadmen <br /> 5. Completely fill the tank with water to a level 2"into A 24"(610mm) 36"(914mm) <br /> the access collar(s). B 24"(610mm) 24"(610mm) <br /> 13 <br />