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0 0 0 For further information concerning fabric specifications and instal lation procedures, consult the filter fabric supplier's installation guides or instructions. To install filter fabric, typically filter fabric manufacturers recom- mend that the installer line the excavation sides and bottom with the fabric. Overlap adjoining panels by at least twelve inches. Place backfill material on the panels around the edge of the hole to anchor them in place. In wet -hole conditions, use backfill material to sink and hofd the fabric in place on the hole bottom. ]RY Hf]LF INSTALLATIL CAUTION: Xerxes recommends that every site be thoroughly evaluated for the potential to trap water or otherwise subject the tank to a rise in the local water table, Xerxes recommends that all tanks be anchored in installations in which water may enter the hole. Failure to anchor the tank in a wet hole may damage the tank or surrounding property. Prepare a smooth, level bed, 12" thick, of approved backfill material. Place the tank or tanks onto the bed. Do not set Xerxes tanks directly onto a concrete slab or on timbers, cradles or directly onto the hole bottom. Leveling: As the tank is being placed, set the tank pitch as shown on the site plans. Xerxes does not require that a tank be pitched. All pitch is determined by the tank owner's specification. If a double wall tank is pitched, the monitor should be at the low end. Use the tops of the ribs to establish longitudinal level. Establish lateral level by placing the level across the top of a fitting, a manway or a collar. When the tank is placed, take the first diameter reading (Deflection reading `A' on the checklist). See Section 13 for instructions on taking deflection readings. If the tank is to be anchored, install the anchoring hardware at this time (See Section 7). BACKFILLING Use only approved backfill material (See Section 3). Do not mix approved material with sand or native soil. Do not use native soil as backfill material. All excavated native soil must be replaced with approved material. Place one 12" lift of material evenly around the tank. From the hole side or the top of an adjacent tank, work the material by hand completely beneath the tank body and domes to provide full support. Use a nonmetal probe bar long enough to reach beneath the tank and push the backfill in place. Repeat this step with a second 12" lift. After the second lift of material has been placed and probed, the backfill can be brought to the top of the tank without further hand work. CAUTION: Do not strike the tank with the probe bar. The tank may be damaged and require repair. RIGHT FIGURE 5-1 FIGURE 5-2 When the tank is backfilled to the tank top: • take an intermediate diameter reading as an in -process check. • repeat the 5 PSIG (3 PSIG for 12 -foot tanks) air test as outlined in Section 2, soaping all exposed areas of the tank and all fittings. :7 SUMMARY 1. Prepare the tank bed. 2. Set and level the tanks, 3. Measure the tank diameter. 4. Install holddown hardware (if applicable). 5. Place and probe the first two lifts of backfill material. 6. Add backfill to the top of the tank. 7. Measure the tank diameter and repeat the air test. After the air test and measurement of tank deflection are success- fully completed, it is recommended that the tank be ballasted until piping installation and final backfilling to grade is completed. When filling the tank make sure that the tank is adequately vented. The vent must be large enough to allow the displaced air to escape. NOTE: Do not ballast the tank until the backfill is even with the top of the tank. WARNING: If product is used as ballast, exercise special care in handling. Safeguard against sparks, fire or product spills. Improper handling of product can cause a fire or explosion, and death, severe personal injury or property damage. WARNING: Do not use air pressure to test tanks that contain flam- mable or combustible liquids, or vapors, and do not perform any post installation pressure test. The fuel and air mixture may explode and cause death, severe personal injury, or property damage. CAUTION: Never allow an empty tank to remain in a wet hole, or a dry hole that may become wet unless anchoring and backfilling have been completed. Failure to anchor and backfill may damage the tank or surrounding property. NOTE: Deflection readings to be taken in sequence similar to steps described in Section 5. Pump the water from the hole to maintain minimum water level, Add a minimum of 12 inches of well-placed backfill material to the hole, and level the bed to assure uniform bottom support for the tank. Position the tank in the hole. Partially ballast tank until it settles firmly on the prepared bed. Ballast level in a tank must never exceed water level in hole during installation. Use only enough ballast to sink the tank until backfill material is even with the top of the tank. WARNING: If product is used as ballast, exercise special care in handling. Safeguard against sparks, fire or product spills. Improper handling of product can cause a fire or explosion, and death, severe personal injury or property damage. After leveling tanks, the anchoring procedures in Section 7 must be followed. Backfill must be added evenly after anchoring, and remaining dry hole backfilling procedures should be followed as stated in Section 5. NOTE: cover depth must meet minimum depth specified in Section 7 of these installation instructions. NOTE: It is recommended that the tank be completely ballasted once backfill is even with the top of the tank. FIGURE 61