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i 0 <br /> PETROLEUM TANK REPAIR WORK <br /> 13215 -2 <br /> 6. Confirm integrity of repaired piping: <br /> a. Isolate diesel fuel piping from tank and dispenser suction pump, <br /> b. Pressure check entire re-assembled length of primary piping using nitrogen at 60 <br /> PSI for one hour prior to replacing back fill. Soap all exposed joints. <br /> C. Reconnect dispenser pump and tank and confirm proper operation of system. <br /> d. Inspect fittings for leaks <br /> e. Precision test diesel tank and piping. <br /> f. Button up all caps, plugs, covers, panels and manholes. <br /> 7. Back fill piping: <br /> a. Surround piping in trenches with a 6" sand or pea gravel (match existing) envelop. <br /> (1) Isolate sand backfill from pea gravel backfill using Geodetic fabric or equal. <br /> b. Continue back filling trenches up to within 8" of AC pavement or within 10" of <br /> concrete slabs in 6" lifts of CL2 aggregate base compacted to 95% of relative <br /> maximum density. <br /> 8. Restore concrete at fueling island: <br /> a. Install #5 reinforcing bars (60 KSI steel) on 12" centers each way. <br /> b. Dowel bars 12" into existing adjacent concrete. <br /> C. Epoxy into place using Sikadur 62 High Modulus adhesive. <br /> d. Apply Sika Armatec adhesive to face of existing concrete. <br /> e. Place concrete (5-112 sack mix with 1/4" aggregate). <br /> f. Crown manholes to facilitate drainage. <br /> g. Apply light broom finish and liquid curing compound/hardener. <br /> 9. Button-up all caps, plugs, covers, panels and manholes. <br /> 10. Sweep down pavement in work area and remove all debris. <br /> 11. Turn over to PG&E a final report including: <br /> a. Written summary of all underground investigation and repair activities. <br /> b. Detailed photos of leakage point and the repair(s). <br /> C. Technical data sheets for all newly-installed components including fiberglass <br /> piping, flex-connector, and neoprene boots and seals. <br /> END OF SECTION <br />