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INSTALLATION PROCEDURES FOR UNDERGROUND STORAGE TANKS <br /> GLASTEELEM BED AND BACKFILL : <br /> ALL EXCAVATED NATIVE SOIL MUST BE REPLACED WITH APPROVED BACKFILL. DO NOT BACKFILL IN LAYERS USING <br /> DIFFERENT MATERIALS. <br /> APPROVED BACKFILL MATERIALS ARE: <br /> 1 . CLEAN WASHED SAND <br /> 2. GRAVEL <br /> A CLEAN, NATURALLY ROUNDED AGGREGATE WITH A MIX OF PARTICLE SIZES NOT LESS THAN 1/8" NOR <br /> MORE THAN 3/4" IS REQUIRED. THIS MATERIAL IS COMMONLY CALLED PEA GRAVEL. <br /> 3. STONED OR GRAVEL CRUSHINGS <br /> WASHED STONE OR GRAVEL CRUSHINGS WITH ANGULAR PARTICLE SIZE NOT LESS THAN 1/8" NOR MORE <br /> THAN 1/2" IS REQUIRED. <br /> LEAK TEST PROCEDURES FOR DOUBLE WALL TANK AT JOBSITE WHILE TANK IS EMPTY : <br /> 1 . INNER TANK TO BE PRESSURIZED AT NOT LESS THAN 3 PSI AND NOT MORE THAN 5 PSI MAXIMUM AND <br /> MAINTAINED WHILE CHECKING FOR PRESSURE DROP. <br /> 2. AFTER MAKING SURE THERE IS NO PRESSURE DROP (LEAKS) MAINTAIN PRESSURE ON INNER TANK AND <br /> APPLY PRESSURE ON OUTER TANK. DO NOT EXCEED INNER TANK PRESSURE ON OUTER TANK. IF THIS IS <br /> DONE IT COULD COLLAPSE THE INNER TANK. <br /> 3. AFTER BEING ASSURED OF NO LEAKS, RELEASE PRESSURE ON OUTER TANK, THEN RELEASE PRESSURE ON <br /> INNER TANK. ACCURATE LOW PRESSURE GAGES MUST BE USED ON BOTH OUTER AND INNER TANK. ( 15 PSI <br /> MAXIMUM ON DIAL). CARE MUST BE TAKEN WHEN FILLING OUTER TANK WITH AIR DUE TO MUCH SMALLER <br /> VOLUME OF AIR REQUIRED FOR PRESSURE. <br /> Page 2 of 2 <br />