COMPLIANCE INFO_1995-2011 - Laserfiche WebLink

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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 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. • Place the second 12" lift evenly around tank. • Probe (with straight probe) the entire tank bottom and around endcaps. • After completion of second lift, backfill can be brought to top of tank without additional handwork. Long Handled Probe \ Second 12" Lift of Backfill , It's critical to tank performance • that this area offer full support under tank and end caps A9. Installation Procedure - Wet Hole Before you begin: • Determine if a filter fabric is necessary for your installation (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. 10 Ballast • If water cannot be lowered, you will need to ballast, (fill tank) tanks to sink them. • Place tanks in the hole • Add enough ballast to sink the tank. ❑ Water level inside tank should not be more than 1' above water level outside tank. • While adding ballast, `W\\\\_"'`""\`"'A use lifting cable to keep tank in position. • Tanks should be free to roll slightly. Backfilling • Place first 12" lift evenly around tank. • Push backfill under tank using ❑ Long handled probe and/or ❑ An air jetT 18" Bed • Place second 12" lift evenly around tank. • Push backfill under tank. • After completion of second lift, backfill can be brought to tank top without using the probe or air jet. An air jet can be constructed by using a 314" 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 installation techniques is available. Call Owens -Coming and ask for Pub. No. 3 -PE -13415, Alternate Backfill Procedure. A10. Piping and Sump Clearances Tanks with Bottom Sumps When installing a tank equipped with a bottom sump, excavating 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.