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9 0 <br /> 8.2.7.When the tank is placed,take the first diameter reading 8.2.12.When the backfill is to the top of the tank,take the <br /> (Deflection Reading"A"on the Installation Checklist). See following steps: <br /> SECTION 14 for instructions on taking deflection readings. <br /> 8.2.12.1 Take the secondary diameter reading as an in-process <br /> 8.2.8. If tank is to be anchored,install the anchoring hardware at check(Deflection Reading"B"on the Installation Checklist). <br /> this time. (See SECTION 6.) See SECTION 14 for instructions. <br /> 8.2.9.Place one 12-inch lift of approved backfill material evenly 8.2.12.2. Repeat the 5 psig air test[3 psig for 12-foot tanks]as <br /> around the tank. From the edge of the hole or the top of an outlined in SECTION 3,soaping all exposed areas of the tank <br /> adjacent tank,push the backfill in place by using a nonmetal and all fittings,and monitoring the pressure for one hour. <br /> probe long enough to reach beneath the tank.Work the backfill <br /> material under the tank body and domes so the tank is fully 8.2.13.After completing the air test and measurement of tank <br /> supported—that is,so there are no voids under the tank. (See deflection,ballast the tank until piping installation and final <br /> FIGURE 8-1 and FIGURE 8-2.) backfilling to grade is completed.When filling the tank,make <br /> sure that the tank is adequately vented.The vent must be large <br /> ACAUTION enough to allow the displaced air to escape.(See SECTION 10.) <br /> Do not strike the tank with the probe or tank damage may <br /> result. <br /> If product is used as ballast, exercise special care in <br /> handling. Safeguard against sparks, fire or product spills. <br /> Improper handling of product could cause a fire or explosion, <br /> Right I I I I I and death serious personal injury or property damage. <br /> IIIV I I I 8.3. WET-HOLE INSTALLATION <br /> i 8.3.1. Follow the dry-hole installation procedure with the <br /> following modifications: <br /> II VIII 8.3.1.1.Before performing Step 8.2.1.of the dry-hole installa- <br /> tion,pump the water from the hole and continue pumping to <br /> I maintain minimum water level during tank installation. <br /> IIIVIII = I I I I I VIII VIII 8.3.1.2.During Step 8.2.2.of the dry-hole installation,when <br /> setting and leveling the tank,partially ballast the tank until it settles <br /> firmly on the prepared bed.The ballast level in the tank must never <br /> FIGURE 8-1 exceed the water level in the hole by more than 1 foot until the <br /> backfill reaches the top of the tank. (See FIGURE 8-3.) <br /> Wrong Tr�� <br /> III VIII � e �_ <br /> - <br /> I ��!� - <br /> _ <br /> III '�n a.. III <br /> 1111VAIIIII VIII ® VIII VIII - <br /> I =1 I — 12" I II <br /> FIGURE 8-2 FIGURE 8-3 <br /> 8.2.10.Repeat Step 8.2.9.with a second 12-inch lift. 8.3.2.Cover depth must meet minimum depth specified in <br /> SECTION 5 of this Installation Manual. <br /> 8.2.11.After the second lift of material has been placed and 8.3.3.Completely ballast the tank once backfill is even with the top <br /> worked under the tank,bring the backfill to the top of the tank. of the tank. <br /> 16 <br />