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2. Cover slab with at least 12 inches of backfill material, free of rock and debris. <br />3. While installing tanks to proper slope, maintain minimum pea gravel bed. <br />F. Burial Depth and Top Concrete Slab: <br />1. Depth of Hole: Refer to Drawings. <br />2. Top Concrete Slab Dimensions: Center slab over tank. <br />a. Slab Length: Tank length + 4 feet minimum. <br />b. Slab Width: Tank width + 4 feet minimum. <br />3. Maximum Depth of Cover: 7 feet maximum. <br />G. Installation Procedure - Dry Hole: <br />1. Bed: Minimum 12 inch pea gravel backfill bed over concrete anchor slab, sloped down toward fill end <br />of tank, as shown on Drawings. Place tanks in hole on backfill bed. <br />a. Caution: Do not place tanks directly on concrete slab or grout tanks in wet concrete. D® not place <br />tanks on anything but 12 inch pea gravel bed. <br />2. Backfilling: <br />a. Pour backfill, using same material as bed, to top of tank in 12 inch lifts. Insure backfill material <br />flows under tank and end caps. <br />b. Do not add water or product in tank before backfill material is to top of tank. (Exception: See <br />Installation Procedure - Wet Hole). <br />3. Leveling.to Grade: <br />a. Bring excavation to within 1 foot, 10 inches of grade with same backfill material. <br />b. Finish leveling with compacted aggregate base. <br />c. Caution: Remove bricks or blocks used to support piping prior to filling -to grade. <br />d. Barricade: To prevent any vehicle travel over tanks. <br />H. Installation Procedure - Wet Hole: <br />1. Water Level: Maintain water level at lowest practical level during installation. Use a system of <br />wellpoints and pumps to minimize water level in hole. Number of wellpoints required will depend on <br />water flow rate into hole. <br />2. Shoring: Use appropriate shoring to insure that sides of hole remain stable and that adjoining property <br />is unaffected. <br />3. Ballast: <br />a. Place tanks in hole adding only enough ballast to sink them. Ballast level in tanks shall never <br />exceed water level in hole during installation. <br />b. Use only lifting cable while adding ballast to keep tanks in position. Tanks should be free to roll <br />slightly. Carefully tend lift cables. Caution: Never place tanks on timbers, beams or cradles. <br />4. Backfill: Distribute backfill evenly around tanks and continue procedure outlined for dry hole 1 <br />installation. <br />UNDERGROUND FUEL STORAGE TANK <br />r-� <br />070601:HTL:lc:cw 13215 -20 CH 107 517 / 107518 <br />