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long -handled probe Second 12" lift of backfill voids Use sa aterials as bedding. Place " lift evenly around tanks. F the bank or adjacent tank top, backfill must be pushed completely beneath tank bottom, between ribs and under endcaps to provide necessary support. A long handled probe can be used to penetrate backfill and push it between all ribs and at three points under endcaps. The backfill may be shoveled beneath the tank. Place another 12" lift of backfill evenly around tanks. Repeat the probing of backfill from the bank or adjacent tank top. After completion of second lift, backfill can be brought to top of tanks or grade without additional handwork. (Compaction may be required for slab support.) prooea section This method will not work in tight areas in straight -walled holes. The angle necessary to probe the back- fill under the tank can not be made with the long -handled probe. Straight -walled holes in tight areas will require a curved probe to 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. A leveraging action on the long -handled probe creates a pushing action under the tank bottom. The following procedure is the most effective for the curved probe a. After setting the tank on the gravel bed, probe the entire tank bottom and around the end caps. b. Place the first 12" lift of backfill. c. Probe the entire tank bottom and end caps again. d. Place the second 12" lift of backfill. e. Switch to straight probe section and probe tank again. CMIM, I M.a s a a A filter fabric separator may be appropriate to prevent gravel migration. Refer to Section 6 for details. Water level should be maintained at lowest practical level by using pumps with or without a well -point system. Prepare bed as outlined in Section 7. Ballast If the water can not be lowered, you will need to ballast tanks. Place tanks in the hole, adding only enough ballast to sink them. Ballast level in tanks must never exceed water level in hole during installation. While adding ballast, use only lifting cable to keep tanks in positions. Tanks should be free to roll slightly. Backfilling Distribute backfill evenly around tanks. Push backfill under tank after each drop using either a long handled probe or an air jet. After backfill is at least 2' up the tank sides, additional backfill can be freely added to tank top without using the probe or air jet. An air jet can be constructed by using a 3/4" diameter pipe connected to a minimum 65 cfm air compressor. A valve on the air jet is essential so the operator can safely control the flow. Additional information on alternate out of hole techniques are available from Owens-Corning. Ask for Pub. No. 3 -PE -13415, Alternate Backfill Procedure. } Anchorinp It is the responsibility of the tank owner or his technical representative to determine if mechanical anchoring is required for a specific job site. All potential sources of water (underground water table, rain water run-off, etc.) should be considered. If water could enter the tank hole, Owens-Corning recommends the tanks be mechanically anchored unless the minimum burial depth from tank top is as follows: Concrete Traffic Slab Thickness 0" 6" Tank Minimum buried depth when Diameter Mechanical Anchoring is Not Required 4' 30" 27„ 6' 45" 42" 8' 54" 51" 10' 69" 66" 12' 81" 78" At the above burial depths, the overburden directly above the tank weighs more than the buoyancy of the empty tank with water to grade (safety factor equals 1.2). Note: TANKS INSTALLED WITH BACKFILL TO TOP OF TANK BUT WITHOUT BACKFILL TO GRADE SHOULD BE COMPLETELY FILLED WITH WATER OR PRODUCT AS BALLAST. DO NOT PLACE WATER OR PRODUCT IN TANK UNTIL BACKFILL IS EVEN WITH TANK TOP. For burial depths where mechanical anchoring is recommeded, either of two common methods can be used: a concrete anchor pad or deadman anchors. Both methods include the use of Fiberglas anchor straps. turnbuckle triple Strapping Use Fiberglas hold-down straps on top of all designated ribs (►•a)" Anchor points should be spaced equal to tank diameter plus 1' on each side of tank, regardless of tank diameter. Anchor points at bottom of hole must be aligned with designated (0- -4) ribs t 1 ". All anchor straps must be uniformly tightened with turnbuckles m co - - eal nStraps ............. snug but cause no tank deflection. Deflection can be detected by checking tank diameter with a gauge stick before and after snugging straps. Triple clamp the wire rope. Note: Do Not Use Straps or Cables Between Ribs. —�• 12" 8" min. #6 re -bar@ thickness 12" o.c. each way cable clamps °concrete pad o 60 NE sero.. ;ti`, Concrete Anchor Pad The weight of overburden on top of the concrete slab provides the anchoring force. This pad design is strictly for buoyancy. Poor soil conditions may require increased reinforce- ment and slab size. Imbed anchor points in concrete and attach them to ends of straps with wire cable (see table at end of this section) and clamp with at least three clamps. (Be sure there is a 12" bed between concrete pad and tanks.)