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OHILLSIDE INSTALLA,,,.N CAUTION: DDT STRIKE THE TANK Tanks may be installed on moderately sloping terrain WITH STEEL BAR provided the slope does not exceed 10 degrees. The After backfill is brought to top of tank,it is recommended downhill side must consist of native soil. Fill dirt is not that water or product be added as ballast until piping permitted on this side to alter the grade of the slope. and final backfilling to grade is accomplished.When fill- The top of the tank must be below the surface of the ing with ballast or product, make sure the tank is ade- downhill side, and must be covered by material with quately vented. depths as stated in item 4. CAUTION—Do not ballast tank with water or product until backfill is even with top of tank (except as noted in wet hole procedure). The same material as specified in Item 3 must be used to completely fill excavation. The backfill must be free -III 100 of debris.Any blocks or bricks used as support material during piping must be removed prior to completion of - = backfilling. Safety measures, such as placing barri- cades until installation is complete, should be used III— III III— around the excavation site. II = NOTE:If there is any reason to believe that water might enter the hole after installation,or if hole is in clay soil with poor drainage,anchoring II II is required. II II III III III — I 1 - I IIII I — O WET HOLE INSTALLATION Pump the water from the hole to maintain minimum wa- ter level.Add a minimum of 12 inches(30 cm)of backfill O7 material to the hole, and level the bed to assure com- DRY HOLE INSTALLATION plete bottom support for the tank. Position the tank in The bed must be smooth and level, and must contain a the hole.The 24 inch(60 cm)spacing between tank and minimum of 12 inches (30cm) of smooth and level pea side wall must be maintained as a minimum in a wet gravel or stone crushings. (See (5 ) Place the tank or hole installation. tanks on the bed carefully. Do not install Xerxes Partially fill the tank with water until it settles firmly on Century-Cast Tanks directly on a concrete slab,or grout the prepared bed. Ballast level in a tank must never tanks in wet concrete. Also, do not install these tanks exceed water level in hole during installation. Use only on timbers,beams,cradles or directly on the hole bottom. enough water to ballast the tank until backfill material is j Leveling even with the top of the tank. After leveling tanks, After the tank is bedded, and prior to backfilling, it must the anchoring proce- be leveled. For longitudinal leveling,place the level across dures in Item 9 must the tank ribs at the top surface. Lateral leveling is ac- be followed. complished by placing the level across the top of the Backfill must be added tank outlet or manway. evenly after anchor- Backfilling ing, and remaining dry hole backfilling pro- Backfill uniformly with the same material used for bed- cedures should be _- ding. In freezing conditions make sure the material is followed as stated in - - - dry and free of ice and snow. First,place a 12 inch(30cm) Item 7. 12" lift of backfill evenly around the tank. Work the material completely beneath the tank body and endcaps by hand in order to provide full support. A board or tamping bar should be used to NOTE:Cover depth must meet minimum depth specified in Item 4 of force the material in I I- ' these installation instructions. place.After the first WRONGr t NOTE:It is recommended the tank be ballasted with water or product 18-24 Inches (45- r ,a once backfill is even with the top of the tank. 60cm) of backfill is ff in place, use the tamping bar to work -W111ML,the backfill into the voids under the edges of the tank RIGHT and ribs and around '\ the endcaps. Re- mainder of backfill " can now be done without further hand - work.