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BACKFILLING <br />Use only approved backfill material (See Section 3). Do not mix <br />approved material with sand or native soil. Do not use native soil <br />as backfill material. All excavated native soil must be replaced <br />with approved material. Place one 12 inch lift of material evenly <br />around the tank. From the hole side or the top of an adjacent <br />tank, work the material by hand completely beneath the tank <br />body and domes to provide full support. Use a nonmetal probe <br />bar long enough to reach beneath the tank and push the backfill <br />in place. Repeat this step with a second 12 inch lift. After the <br />second lift of material has been placed and probed, the backfill <br />can be brought to the top of the tank without further hand work. <br />CAUTION: <br />Do not strike the tank with the probe bar. The tank may be <br />FIGURE 5-1 <br />rJ�1 7 <br />When the tank is backfilled to the tank top: <br />• take an intermediate diameter reading as an in -process <br />check. <br />• repeat the 5 PSIG (3 PSIG for 12 foot tanks) air test as <br />outlined in Section 2, soaping ail exposed areas of the tank <br />and all fittings. <br />1. Prepare the tank bed. <br />2. Set and level the tanks. <br />3. Measure the tank diameter. <br />4. Install holddown hardware (if applicable). <br />S. Place and probe the first two lifts of backfill material. <br />S. Add backfill to the top of the tank. <br />7. Measure the tank diameter and repeat the air test <br />After the air test and measurement of tank deflection are <br />successfully completed, it is recommended that the tank be <br />ballasted until piping installation and final backfilling filling to grade is <br />completed. When filling the tank, make sure that the tank is <br />adequately vented. The vent must be large enough to allow the <br />displaced air to escape. <br />NOTE: Do not ballast the W* until the packfill is even wfth the mo of the tank. <br />WARNING: <br />If product is used as ballast; a in haadflng. <br />Safeguard against sparks, Erre or product spill& Improper <br />handling of product can cause a fire or explosion, and death, <br />severe personal injury of property da e. <br />WEr HOLE INSTALLATION <br />:.. ✓, .. i,'.... t.., r .: s. r fir- r. r.r-: <br />Q CAUTION: <br />Never allow an empty tank to remain in a wet hole, or a dry hole <br />that may become wet, unless anchoring and backfilling -have <br />been completed Failure to anchor and backfill may damage <br />the tank or surrounding property. <br />NOTE: deflection readings to be taken in sequence similar to steps deswbed in <br />Section 5. <br />Pump the water from the hole to maintain minimum water level. <br />Add a minimum of 12 inches of well-placed backfill material to the <br />hole, and level the bed to assure uniform bottom support for the <br />tank. Position the tank in the hole. <br />Partiaily ballast tank until it settles firmly on the prepared bed. <br />Ballast level in a tank must never exceed water level in hole <br />during installation. Use only enough ballast to sink the tank until <br />backfill material is even with the top of the tank. <br />/!\ WVARiNG: <br />N product is used as ballast, exercise special care in handling. <br />Safeguard against sparks, fire or product spillt improper <br />handling of product can cause a fire or explosion, and death, <br />severe personal injury or property damage. <br />After leveling tanks, the anchoring procedures in Section 7 must <br />be followed. <br />Backfill must be added evenly after anchoring, and remaining dry <br />hole backfilling procedures should be followed as stated in <br />Section S. <br />NOTE: Lover depth must meet minimum depth specified in Section 4 of these <br />instaitation instructions. <br />NOTE: I is recommended tai the tank be completely ballasted orate backfill is <br />even with the top of the tardL <br />/L CAUTION: <br />Xerxes recommends that every site be thoroughly evaluated <br />for the potential to trap water or otherwise subject the tank to a <br />ase in the %cal water table. Xerxes recommends that ail tanks <br />be anchored in installations in which water may enter the hole <br />railure to anchor may damage the tank or surrounding <br />property <br />A deacman is a reinforced concrete beam. The length of the <br />deaoman is equal to the ength of the tank. A deadman may be <br />faoncated in multiple secsons as long as the total length is not <br />aecreased and each section contains at least two anchor points. <br />ahe width and thickness cecend on [he tank diameter. Refer to <br />:able 7-' nor mecmc dimensions. <br />NOTE: wars of t0 `oot diameter arta .^AG l gatkxts or Larger may require <br />mW ce :o oftet movancl. Czmact Xerxes' :acrinicai Service <br />