COMPLIANCE INFO_1999-2001 - Laserfiche WebLink

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n n • 8.2.7. When the tank is placed, take the first diameter reading (Deflection Reading "A" on the Installation Checklist). See SECTION 14 for instructions on taking deflection readings. 8.2.8. If tank is to be anchored, install the anchoring hardware at this time. (See SECTION 6.) 8.2.9. Place one 12 -inch lift of approved backfill material evenly around the tank. From the edge of the hole or the top of an adjacent tank, push the backfill in place by using a nonmetal probe long enough to reach beneath the tank. Work the backfill material under the tank body and domes so the tank is fully supported — that is, so there are no voids under the tank. (See FIGURE 8-1 and FIGURE 8-2.) CA TIO Do not strike the tank with the probe or tank damage may result. I9[ell]V:15 FIGURE 8-2 8.2.10. Repeat Step 8.2.9. with a second 12 -inch lift. 8.2.11. After the second lift of material has been placed and worked under the tank, bring the backfill to the top of the tank. 16 Ll 8.2.12. When the backfill is to the top of the tank, take the following steps: 8.2.12.1 Take the secondary diameter reading as an in -process check (Deflection Reading "B" on the Installation Checklist). See SECTION 14 for instructions. 8.2.12.2. Repeat the 5 psig air test [3 psig for 12 -foot tanks] as outlined in SECTION 3, soaping all exposed areas of the tank and all fittings, and monitoring the pressure for one hour. 8.2.13. After completing the air test and measurement of tank deflection, ballast the tank 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. (See SECTION 10.) AWARNING 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 death, serious personal injury or property damage. 8.3. WET -HOLE INSTALLATION 8.3.1. Follow the dry -hole installation procedure with the following modifications: 8.3.1.1. Before performing Step 8.2.1. of the dry -hole installa- tion, pump the water from the hole and continue pumping to maintain minimum water level during tank installation. 8.3.1.2. During Step 8.2.2. of the dry -hole installation, when setting and leveling the tank, partially ballast the tank until it settles firmly on the prepared bed. The ballast level in the tank must never exceed the water level in the hole by more than 1 foot until the backfill reaches the top of the tank. (See FIGURE 8-3.) 8.3.2. Cover depth must meet minimum depth specified in SECTION 5 of this Installation Manual. 8.3.3. Completely ballast the tank once backfill is even with the top of the tank.