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5.2.12.3.1.Sloping of tanks may affect accuracy of calibration NOTICE charts. Do not use metal probes.Failureto follow this notice may 5.2.12.3.2. If a double-wall tank is sloped,the monitor should result in damage to the tank. be at the low end in a tank with a dry interstitial space and at the high end in a tank with a wet interstitial space.See SEC- tical An object like a long wooden shovel handle is a prat- - TION 15 for more information. tical choice as a tamping rod. 5.2.13.Use the tops of the ribs to establish longitudinal level. NOTICE Establish lateral level by placing the level across the top of a Do not strike the tank with the tamping rod. Failure to heed fitting or a manway, this notice may result in damage to the tank. 5.2.14.If anchor straps are to be used, install them at this 5.2.17.Repeat POINTS 5.2.16. and 5.2.16.1.with a second lift time.See SECTION 8.2. of approximately 12 inches of primary backfill. 5.2.14.1.The locations for anchor straps are marked on tank 5.2.18.After the second lift of material has been placed and ribs by the arrowhead symbol►®(on the tank itself on 4-foot- worked under the tank, bring the backfill to the top of the tank. diameter tanks). 5.2.18.1. Place backfill material evenly on opposite sides of - 5.2.14.2.All marked anchor strap locations must have straps. the tank so that the tank does not shift. NOTICE 5.2.19. If secondary backfill material is to be used on the perimeter of the installation, it must be placed and compacted Do not place straps between ribs.Failure to properly place at the same time as the primary backfill material. straps may result in damage to the tank. 5.2.14.3. Place a strap on each marked location and install an- 5.2.20. During the backfilling process,it is good practice to choring hardware.See SECTION 8, continue to check tank deflection. 5.2.14.4.Tighten each anchor strap until it is snug over the rib NOTICE , (over the tank itself in 4-foot-diameter tanks)but causes no Thoroughly hand tamp backfill to eliminate all voids under deflection of the tank.Straps must be uniformly tight. the tank.Do not allow the tank to shift during the backfill procedure.If there are voids under the tank and/or the tank 5.2.14.5.The elevation of deadmen is critical. If a strap ap- has shifted(and the backfill is above one-quarter(1/4)of the pears too short or there is not sufficient adjustment in the turn- tank diameter),it may be necessary to remove and reinstall buckle to make the strap snug,the tank and/or tank anchors the tank. Failure to follow this notice may result in damage must be repositioned by adding or removing backfill material to the tank and/or property damage. until the straps are properly installed. 5.2.21.After backfill has been brought to the top of the tank, NOTE:Make sure that the minimum bedding thickness of take another tank diameter measurement.Record it as Meas- 12 inches has been maintained. urement#3 in the Tank Installation Checklist, and determine whether tank deflection is within the allowable limits shown in _ 5.2.14.6.After the straps have been installed and tightened,take a TABLE 11-1. tank diameter measurement to check tank deflection,and record it as Measurement 42 on the Tank Installation Checklist. 5.2.22.All UL-labeled tanks,chemical tanks and potable water tanks must be air tested after backfill is brought close to the NOTICE top of the tank. Overdeflection of the tank may result in damage to the tank. 5.2.23. If additional testing(postinstallation testing for air- 5.2.15.On water/wastewater tanks with bottom fittings, piping testable tanks or optional hydrostatic testing)is to be done, needs to be installed at this time. perform those tests now.See SECTION 13 for instructions. - 5.2.16.Place approximately 12 inches of primary backfill 5.2.24.Typically,the tank should be ballasted at this time.See around the bottom of the tanks between the ribs(if present) SECTION 12 for instructions. and under the end domes. 5.2.25. If piping and/or venting needs to be installed, complete 5.2.16.1. Use a nonmetal tamping rod long enough to reach this work now.See SECTION 14 for instructions. beneath the tank to push material under the tank body and 5.2.26.If containment sumps need to be installed,do that domes until solid resistance is felt,all voids are filled and the now.See SECTION 16 for instructions. tank is fully supported.See FIGURE 5-1. 5.2.27.Continue to backfill to grade,or to subgrade if rein- forced concrete or asphalt is to be installed. Right VIII- Wrong VIII= 5.2.28.When the tank has been backfilled to subgrade(but IP-11111 III=VIII before placement of reinforced concrete or asphalt),take the 1= — last required tank diameter measurement. Record it as Meas- uI1-11111 =11111 urement 44 and determine whether tank deflection is within Hill —I I I I I I I L_ 1111_Frill_1.11F= the allowable limits shown in TABLE 11-1. FIGURE 5-1 9