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FIGURE 6.7 6.7.1.4. The following method is shown in FIGURE 6-8: • loop a wire rope around the deadman at each location that cor- responds to each rib marked with the arrowhead symbols ►® ; • secure the termination of the wire rope (See SECTION 6.5. for suggested method.); • lower each deadman to the bottom of the excavation using the wire rope; • center each hold-down strap on each rib marked with the arrowhead symbols ►® ; • bring the live end of each wire rope up to the top of the tank at each marked rib; • take the slack out of each wire rope and splice the termina- tion of the wire ropes on top of the tank (See SECTION 6.5.). FIGURE 6-8 7.1. GENERAL 7.1.1. When handling a tank with a bottom sump or fitting, always take extra care so that the bottom sump or fitting is not damaged by contact with any other object, such as the truck bed or the ground. CAUTION All connections to the tank must be flexible. Provisions must be made to accommodate movement and misalign- ment between the piping and the tank. 7.1.2. During installation, provide a clear area in the backfill bedding so that the tank rests on the backfill bedding and the sump or bottom fitting is clear. 7.1.3. After setting the tank, fill and tamp the resulting void by using hand tools before continuing the backfilling. 16 ® WARNING If product is used as ballast, exercise special care in handling. Safeguard against sparks, fire or product spills. Improper handling of product could cause a fire or explosion and result in death or serious injury. ®WARNING Do not use air pressure to test tanks that contain or have contained flammable or combustible liquids or vapors. The fuel and air mixture could explode and result in death or serious injury. Tanks should be air tested before ballasting. CAUTION Adequately ballast the tank (add liquid) in a wet hole or in a dry hole that may become wet (for example, from site runoff) until the installation is totally completed. Failure to do this may damage the tank or surrounding property. 8.1. GENERAL 8.1.1. Use only approved backfill material. (See SECTION 4.) 8.1.2. Do not mix approved material with sand or in situ soil. 8.1.3. Do not use in situ soil as backfill material. 8.1.4. All excavated in situ soil must be replaced with approved material. 8.2. DRY -HOLE INSTALLATION 8.2.1. Prepare a smooth level bed, 12 inches thick, of approved backfill material. 8.2.2. Refer to Points 2.1.3. through 2.1.3.6. regarding the use of lifting lugs to hoist the tank when unloading and installing it. 8.2.3. Place the tank or tanks onto the bed. Do not set Xerxes tanks directly onto a concrete slab, on timbers or cradles, or onto the in situ soil. 8.2.4. As the tank is being placed, slope the tank according to site specifications. (Xerxes does not require that a tank be sloped. The slope is determined by the tank owner's specifications.) 8.2.5. Sloping of tanks may affect accuracy of Xerxes calibration charts. 8.2.6. If a double-wall tank is sloped, the monitor should be at the low end. 8.2.7. Use the tops of the ribs to establish longitudinal level. Establish lateral level by placing the level across the top of a fitting or a manway. 8.2.8. When the tank is placed, take a measurement of the internal diameter of the tank. (See SECTION 14 of the Installation Manual for instructions on taking diameter measurements.) Record this measurement as Initial Internal Diameter on the Tank Installation Checklist, SECTION 4.