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Installation Procedure - Dry Hole (Straight or Shored Walls) • Set tank 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. • The curved probe is a 4' section of the long - handled aluminum probe bent on a radius to match the tank curvature. • Probe (with curved probe) the entire tank bottom and around end caps. • Place first 12" lift evenly around tank. • Probe (with curved probe) the entire tank bottom and around end caps. Push backfill evenly against tank walls and under end cap. Long handled Probe • Place the second 12" liftr4\ % , Utt�uf B�acikfill evenly around tank. V • Probe (with straight probe) the entire tank bot- tom and around endcaps. After completion of sec- • It's critical to tank pertonnance p that this area offer full support and lift, backfill can be under tank and end caps brought to top of tank without additional hand- work. A9. Installation Procedure - Wet Hole Before you begin: • Determine if a filter fabric is necessary for your installa- tion (see section A6 for details). In general: • Water level should be maintained at lowest practical level by using pumps (with or without a well -point system). Bed • Provide a minimum bed of 18" of approved backfill. Ballast • If water cannot be lowered, you will need to ballast (fill tank) tanks to sink them. • Place tanks in the hole, maintaining control with lifting cables. 10 A.9 Installation Procedure - Wet Hole % . Add enough ballast to sink the tank. Water level In- si should not . above - w shouldlevel uts'de 141• While adding ballast,use 'lifting cable to 'ell keep tank 'In position. MEMO MEN• Tanks Backfilling • Place first 12" lift evenly around tank • Push backfill under tank using ❑ Long handled probe and/or, ❑ An air jet." • Place second 12" lift evenly around tank. • Push backfill under tank. • After completing the second lift, backfill can be brought to tank top without using the probe or air jet. • An air let can be constructed by using a 3/I" pipe connected to a 65 cfm compressor. We recommend you install a valve on the air jet• which allows the operator to safely control the flow Additional information on alternate man -out -of -hole instal- lation techniques is available. Call Fluid Containment and ask for Pub. No. 13415, Alternate Backfill Procedure. A10. Piping and Sump Clearances Tanks with Bottom Sumps When installing a tank equipped with a bottom sump, ex- cavating and bedding must be modified to provide: • A hole centered at the sump location. • Hole should be 12" deep x 24" diameter. After the tank is placed, the void surrounding the sump must be: • Hand backfilled and • Hand tamped prior to adding backfill around tank. External Piping • The pump and attached piping must be free to move with the tank. • Use a fill box or street box to isolate the piping from the traffic pad.