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For further information concerning fabric specifications and instal- SUMMARY lation procedures,consult the filter fabric supplier's installation 1. Prepare the tank bed. guides or instructions. 2. Set and level the tanks. To install filter fabric,typically filter fabric manufacturers recom- 3. Measure the tank diameter. mend that the installer line the excavation sides and bottom with 4. Install holddown hardware. the fabric.Overlap adjoining panels by at least twelve inches. 5. Place and probe the first two lifts of backfill material. Place backfill material on the panels around the edge of the hole 6. Add backfill to the top of the tank. to anchor them in place. 7. Measure the tank diameter and repeat the air test. In wet-hole conditions,use backfill material to sink and hold the After the air test and measurement of tank deflection are success- fabric in place on the hole bottom. fully completed,it is recommended that the tank be ballasted until piping installation and final backfilling to grade is completed.When r r INSTALLATION filling the tank make sure that the tank is adequately vented.The CAUTION:Xerxes recommends that every site be thoroughly vent must be large enough to allow the displaced air to escape. evaluated for the potential to trap water or otherwise subject the NOTE:Do not ballast the lank until the backf l is even with the top of the tank tank to a rise in the local water table.Xerxes recommends that all WARNING:If product is used as ballast,exercise special care in tanks be anchored in installations in which water may enter the handling.Safeguard against sparks,fire or product spills.Improper hole.Failure to anchor the tank in a wet hole may damage the tank handling of product can cause a fire or explosion,and death, or surrounding property. severe personal injury or property damage. Prepare a smooth,level bed,12"thick,of approved backfill t material.Place the tank or tanks onto the bed.Do not set Xerxes tanks directly onto a concrete slab or on timbers,cradles or CAUTION:Never allow an empty tank to remain in a wet hole,or a directly onto the hole bottom. dry hole that may become wet unless anchoring and backfilling Leveling:As the tank is being placed,set the tank pitch as shown have been completed.Failure to anchor and backfill may damage on the site plans.Xerxes does not require that a tank be pitched. the tank or surrounding property. All pitch is determined by the tank owners specification.If a double NOTE:Deflection readings to be taken in sequence similar to steps described in wall tank is pitched,the monitor should be at the low end.Use the section 5. tops of the ribs to establish longitudinal level.Establish lateral level Pump the water from the hole to maintain minimum water level. by placing the level across the top of a fitting,a manway or a collar. Add a minimum of 12 inches of well-placed backfill material to the When the tank is placed,take the first diameter reading(Deflection hole,and level the bed to assure uniform bottom support for the reading'A'on the checklist).See Section 13 for instructions on tank.Position the tank in the hole. taking deflection readings. Partially ballast tank until it settles firmly on the prepared bed. If the tank is to be anchored,install the anchoring hardware at this Ballast level in a tank must never exceed water level in hole during time(See Section 7). installation.Use only enough ballast to sink the tank until backfill BACKFILLING material is even with the top of the tank. Use only approved backfill material(See Section 3).Do not mix WARNING:If product is used as ballast,exercise special care in approved material with sand or native soil.Do not use native soil handling.Safeguard against sparks,fire or product spills.Improper as ball material.All excavated native soil must be replaced with handling of product can cause a fire or explosion,and death, approved material.Place one 12"lift of material evenly around the severe personal injury or property damage. tank.From the hole side or the top of an adjacent tank,work the After leveling tanks,the anchoring procedures in Section 7 must material by hand completely beneath the tank body and domes to be followed. provide full support Use a probe long enough to reach beneath the Backfill must be added evenly after anchoring,and remaining tank and push the backfill in place. Repeat this step with a second dry hole backfilling procedures should be followed as stated in 12"lift.After the second lift of material has been placed and probed, Section 5. the backfill can be brought to the top of the tank without further NOTE Cover depth must meet minimum depth specified in Section 7 of these hand work. installation instructions. I CAUTION:Do not strike the tank with the tamping bar.The tank NM It is recommended that the tank be completely ballasted once baddill is even may be damaged and require repair. with the top of the tank Did 11 0 oil RIGHTIIII — WRONG II I - III- IIT IIII_II IIIII _=IIIII =IIII =1 II-IIII III I=- II1WIIII _ _ - When the tank is backfilled to the tank top: •take an intermediate diameter reading as an in-process check. •repeatthe 5 PSI airtest as outlined in Section 2,soaping all z" eicposed areas of the tank and all fittings.