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SECTION • • Double INSTALL TION PROCEDURE - DRY HOLE 4� (STRAIG T OR SHORED WALLS) ♦ Set to k on minimum 12" approved backfill bed. ♦ Straight or shored walled holes in tight areas require a curved probe to properly backfill under and around the tanks. i INSTALLATION PROCEDURE - WET HOLE ♦ The curved probe is a 4' section of the long- Before you begin: handlprobe bent on a radius to match ♦ Determine if a filter fabric is necessary for your installa- the tank curvature. tion (see section A6 for details). ♦ Probe (with curved probe) the entire tank bottom and around end caps between the 5 and 7 o'clock position. In general: ♦ Place first 12" lift evenly around tank. ♦ Water level should be maintained at lowest practical level ♦ Probe (with curved probe) the entire tank bottom by using pumps(with or without a well-point system). and around end caps at the 5 - 7 o'clock position. Bed Push backfill evenly against tank walls and under ♦ Provide a minimum bed of 18" of approved backfill. end cap (see figure 20). FIGURE 20 Ballast Long Handled Probe — ♦ If water cannot be lowered, you will need to ballast(fill tank)tanks to sink them. ♦ Place tanks in the 4' Curved hole, maintaining Probe control with lifting Section cables attached to all lift lugs pro- 12• BED vided on tank. CONCRETE �. �':; kii4 SLAB ♦ Add enough bal- (OPTIONAL) last to sink the tank ♦ Place the second 12" lift evenly around tank. (see figure 22). FIGURE 22 0 Water level inside tank should not be more than 1' ♦ Probe (with straight probe) the entire tank bottom above water level outside tank. and around endcaps at the 3 - 5 o'clock position (see figure 21). ♦ While adding ballast,use lifting cable to keep tank in posi- FIGURE 21 tion. Long Handled Probe ♦ Tanks should be free to roll slightly. Second 12" Lift Backfilling of Backfill ♦ Place first 12" lift evenly around tank First 12"Lift of ♦ Push backfill under tank using Backfill 0 Long handled probe and//or, 5 Cl An air jet." ♦ Place second 12" lift evenly around tank. Bed ♦ Push backfill under tank. ♦ After completing the second lift,backfill can be brought It is critical to tank performance to tank top without using the probe or air jet. that this area offer full support An air jet can be constructed by using a 3/4"steel pipe con- under tank and end caps netted to a 65 cfm compressor. We recommend you install a ♦ After completion of second lift, backfill can be valve on the air jet, which allows the operator to safely control brought to top of tank without additional hand- the flow. work. NOTE:To minimize the chance of tank buoyancy,back- Additional information on alternate man-out-of-hole in- stallation possible techniques is available. Call Containment Solu- p p tions and ask for Pub. No. INST 6004, Alternate Backfill ballast(fill tank)with water or product. Procedure. 14