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8. INSTALLATION A 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 it in death or serious injury. A WARNING Do not use air pressure to test tanks that contain or have FIGURE 6-7 contained flammable or combustible liquids or vapors. The 6.7.1.4.The following method is shown in FIGURE 6-8: fuel and air mixture could explode and result in death or • loop a wire rope around the deadman at each location that cor- serious injury. Tanks should be air tested before ballasting. responds to each rib marked with the arrowhead symbols►t; • secure the termination of the wire rope(See SECTION 6.5. CAUTION for suggested method.); Adequately ballast the tank(add liquid)in a wet hole or in a • lower each deadman to the bottom of the excavation using dry hole that may become wet(for example,from site the wire rope; runoff)until the installation is totally completed.Failure to • center each hold-down strap on each rib marked with the do this may damage the tank or surrounding property. arrowhead symbols►A ; • bring the live end of each wire rope up to the top of the tank 8.1.GENERAL at each marked rib; 8.1.1.Use only approved backfill material. (See SECTION 4.) • take the slack out of each wire rope and splice the termina- 8.1.2.Do not mix approved material with sand or in situ soil. tion of the wire ropes on top of the tank(See SECTION 6.5.). 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. r- / � 1 .y 8.2.2.Refer to Points 2.1.3. through 2.1.3.6.regarding the use `5 of lifting lugs to hoist the tank when unloading and installing it. FIGURE 6-8 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 7. BOTTOM SUMPS AND FITTINGS onto the in situ soil. 7.1.GENERAL 8.2.4.As the tank is being placed,slope the tank according to site 7.1.1.When handling a tank with a bottom sump or fitting, specifications.(Xerxes does not require that a tank be sloped. always take extra care so that the bottom sump or fitting is not The slope is determined by the tank owner's specifications.) damaged by contact with any other object,such as the truck bed 8.2.5.Sloping of tanks may affect accuracy of Xerxes calibration or the ground. charts. CAUTION 8.2.6. If a double-wall tank is sloped,the monitor should be at All connections to the tank must be flexible.Provisions the low end. must be made to accommodate movement and misalign- 8.2.7.Use the tops of the ribs to establish longitudinal level. ment between the piping and the tank. Establish lateral level by placing the level across the top of a 7.1.2. During installation,provide a clear area in the backfill fitting or a manway. bedding so that the tank rests on the backfill bedding and the 8.2.8.When the tank is placed,take a measurement of the sump or bottom fitting is clear. internal diameter of the tank.(See SECTION 14 of the 7.1.3.After setting the tank,fill and tamp the resulting void by Installation Manual for instructions on taking diameter using hand tools before continuing the backfilling. measurements.)Record this measurement as Initial Internal Diameter on the Tank Installation Checklist,SECTION 4. 16