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Use sar%_.aterias as bedding. If water could enter the t�iole,O/C Tanks recommends the tanks be long-handled Place firslT2"lift evenly around mechanically anchored u „essthe minimum burial depth from tank top is probe tanks.From the bank or adjacent asfollows: tanktop,ball must apushed completely beneath tank bottom, Concrete Traffic betweenribsand un der endcaps Second to provide necessary support.A Slab Thickness 0” 6" ' 12'lift of long handled probe can be used Tank Minimum buried depth when backfill to penetrate backfilt and push it between all ribs and at 3 to 5 points DemeterMechanical Anchoring is Not Required voids under endcaps.The backfill may 4' 30" 27' be shoveled beneath the tank. 61 45" 42" Place another 120 lift of backfill 81 54" 51" -- �_• �12'6ed'-�•"'� evenly around tanks.Repeat the 10, 69" probing of backfill from the bank or 12' 81" 78" adjacenttanktop. At the above burial depths,the overburden above the tank weighs more Probe After completion of second lift, than the buoyancy of the empty tank with water to grade(safety factor k""handledbackfill can be brought to top of equals l.2). tanks or grade without additional Note:TANKS INSTALLED WITH BACKFILL TO TOP OF TANK BUT hquired krslab support.) maybe WITHOUT BACKFILL TO GRADE SHOULD BE COMPLETELY FILLED required for slab support.) WITH WA-TER OR PRODUCT AS BALLAST.DO NOT PLACE WATER 1 This method will not work in tight OR PRODUCT IN TANK UNTIL BACKFILL IS EVEN WITH TANK TOP. areas in straight-walled holes.The 4'curved angle necessary to probe the back- For burial depths where mechanical anchoring is recommended.either probed section fill under the tank can not be made of two common methods can be used:aconcrete anchor pad ordead- with the long-handled probe. man anchors.Both methods include the use of Fiberglas anchor straps. Straight-walled holes in tight areas ��`•;��• will require a curved probe to Strapping backfill under the tanks. Use Fiberglas anchor straps be, The curved probe is a 41 section of tween the arrows on the tank the long handled aluminum probe bent on a radius to match the tank wrnbockie sides. curvature.A leveraging action on the long-handled probe creates a tonal For double-wall tanks,2,500 pushing action under the tank bottom, vlple gallon rapacity and larger,the The following procedure is the most effective for the curved probe: clamped anchor straps must also be placed a.After setting the tank on the gravel bed.probe the entire tank bottom wire in the strap guides at the tank top. and around the end caps. :o_ ._;::s::;z For single-wall tanks 2,000 gallon capacity and larger,anchor straps b.Place the first 12"lift of backfill. - Y c.Probe the entire tank bottom and end caps a gin. A �1 must be placed on top of all d.Placethesecond 12"liftofbackfill. designated external ribs(►), e.Switch to straight probe section and probe tank again- Anchor points should be spaced 4 equal to tank diameter plus 1'on each side of tank,regardless of tank diameter.Anchor points at bottom of AB. Installation Procedure—Wet Hole hole must be aligned with designatedribs tl". A filter fabric separator may be appropriate to prevent gravel migration. All anchor straps must be uniformly fightened with turnbuckles or comew Refer to Section A6 for details.Water level should be maintained at lowest a-longs.Straps should besnug but cause no tank deflection.Deflection practical level by using pumps with or without a well-point system. can be detected by checking tank diameter with a gauge stick before and Prepare bed as outlined in Section AT after snugging straps. Ballast Triple clamp the wire rope. If the water can not be lowered, Note:Do Not Use Straps or Cables Between Ribs. you will need to ballast tanks. Place tanks in the hole,adding _ Concrete Anchor Pad only enough ballast to sink them. 12 The weight of overburden on top of Ballast level in tanks must nevere•min. the concrete slab provides the exceed water level in hole during es Ro-bar�` thickness anchoring force. installation.While adding ballast, 12•o.c. use only lifting cable to keep tanks each way This pad design is strictly for in position.Tanks should be free to buoyancy.Poor soil conditions roll slightly. triple mayrequireincreasedreinforce- ment and slab size. Imbed anchor points in concrete _- - - Distribute backfill evenly around - tanks.Push ;R backfill undertank R`=':i�: ` and attach them to ends of straps :::1z•i17<_ eea with wire rope(see table at end of after each drop using efthera long handled probe oran air jet. this section)and clamp with at After backfill is at least 2'up the tank sides,additional backfill can be Uffl.cTnc:eta pato; ^bi_�..,ti least three clamps.(Be sure there freely added to tank top without using the probe or air jet. is a 12" bed between concrete An air jet can be constructed by using a 8L"diameter pipe connected to a pad and tanks.) minimum 65 cfm air compressor.A valve on the air jet is essential so the The concrete pad must extend a minimum of l8"beyond sides of tank operator can safely control the flow. and be at least equal in length to the tank.It is best to extend the slab to the undisturbed native soil. Additional information on alternate out of hole techniques are available from OIC Tanks.Ask for Pub.No.3-PE-13415,Alternate Backfill Deadman Anchors Procedure. deadmanisnua lenWhoftank The weight of overburden on top oneach site of the deadman and tank provides A9. Anchoringthe anchoring force Lay deadman along each side and parallel to It isthe responsibility of the tank owner or his technical representative totank.The tank must not'over- determineifinechanicalanchoringisrequiredforaspecificjobsite.All triDie shadow'the deadman anchor. �--'� potential sources of water(underground watertable,ran water run-off, clam Clamp wire rope with at least three ps etc.)should beconsidered. clamps around deadman and through end of strap. o e" center aB4ebars In cross sectio .. F