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8.2.9.If tank is to be anchored,install the anchoring hardware at 11111 this time.(See SECTION 6.) 8.2.10.Place one 12-inch lift of approved backfill material evenly 1=1 I IIII around the tank.From the edge of the hole or the top of an =IIIII IIIII adjacent tank,push the backfill in place by using a nonmetal probe long enough to reach beneath the tank.Work the backfill lllll—III — -=_ — III II I material under the tank body and domes so the tank is fully supported—that is,so there are no voids under the tank.(See IIIII-1111 IIII IIIII FIGURE 8-1 and FIGURE 8-2.) =LMIIIIJJ-IIIII 12 II-IIII-IIIII-1 II CAUTION FIGURE 8-3 Do not strike the tank with the probe or tank damage may result 8.3.2.Cover depth must meet minimum depth specified in SECTION 5 of this Installation Manual. Right IIIII = 8.3.3.Completely ballast the tank once backfill is even with the - III—IIIII top of the tank. IIIII— 9. POSTINSTALLATION TESTING IIII—IIIII —IIIII= A WARNING Do not use air pressure to test tanks that contain or have FIGURE 8.1 contained flammable or combustible liquids or vapors. The _ fuel and air mixture could explode and result in death or Wrong IIIII= serious injury. Tanks should be air tested before ballasting. III=IIIII A WARNING IIIII= if product is used as ballast,exercise special care in handling. IIII—IIIII Safeguard against sparks,fire or product spills.Improper —IIIII— handling of product could cause a fire or explosion and result in death or serious injury. FIGURE 8-2 9.1.GENERAL 8.2.11.Repeat Point 8.2.10.with a second 12-inch lift. 9.1.1.After backfill is brought to the top of the tank,take a 8.2.12.After the second lift of material has been placed and measurement of the internal diameter of the tank as a deflection worked under the tank,bring the backfill to the top of the tank. check.(See SECTION 14 of the Installation Manual for instructions on taking diameter measurements.) 8.3.WET-HOLE INSTALLATION 9.1.2.After the internal diameter of the tank has been measured 8.3.1.Follow the dry-hole installation procedure(SECTION 8.2.) and vertical deflection is determined to be within the limits with the following modifications: specified by Xerxes(See table in Tank Installation Checklist, 8.3.1.1.Before performing Point 8.2.1.of the dry-hole installa- SECTION 4.),the tank must be pressure tested to ensure that tion,take a measurement of the internal diameter of the tank no damage occurred during installation. before the tank is placed in the excavation hole.(See SECTION 9.1.3.Follow the procedure in SECTION 3,soaping all exposed areas 14 of the Installation Manual for instructions on taking diameter of the tank and all fittings,and monitoring the pressure for one hour. measurements.)Record this measurement as Initial Internal Diameter on the Tank Installation Checklist,SECTION 4. 9.1.4.Carefully relieve the pressure in the tank.Remove the 8.3.1.2.Before performing Point 8.2.1.of the dry-hole installa- quick-disconnect assembly from dry double-wall tanks. tion,pump the water from the hole and continue pumping to maintain minimum water level during tank installation. 10. BALLASTING(ADDING LIQUID) 8.3.1.3.During Point 8.2.2.of the dry-hole installation,when A WARNING setting and leveling the tank,partially ballast the tank until it Do not use air pressure to test tanks that contain or have settles firmly on the prepared bed.The ballast level in the tank contained flammable or combustible liquids or vapors,and must never exceed the water level in the hole by more than 1 foot do not perform any postinstallation pressure tests. The fuel until the backfill reaches the top of the tank.(See FIGURE 8-3.) and air mixture could explode and result in death or serious 8.3.1.4.Omit Point 8.2.8. injury. Tanks should be air tested before ballasting. 17