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• Proper backfilling is required to provide necessary • After completion of second lift, backfill can be brought <br /> support for the tank. to tank top without additional handwork. <br /> • Use approved backfill. • Special Instructions for a wet hole installation: <br /> • Place the first 12"lift of approved backfill material - Water level in the excavation should be maintained <br /> evenly around the tank. From the edge of the hole or at lowest practical level by using pumps. <br /> the top of an adjacent tank, push the backfill in place <br /> by using a probe long enough to reach beneath the <br /> tank. Work the backfill material under the entire length <br /> of the tank between and around ribs and endcaps, Keep tank vented to prevent pressurization <br /> eliminating all voids, so the tank is fully supported of tank when adding ballast.As the tank <br /> (see Figure 1-4). nears full,reduce the ftil rate to prevent <br /> pressurization or tank damage may occur. <br /> Figure 14 This may result in personal injury or <br /> property damage. <br /> Long Handled Probe <br /> - Ballast the tank if ground water cannot be lowered. <br /> / - For compartment tanks, add ballast to <br /> compartments as needed to keep tank level.Add <br /> j\\\ j\\j enough ballast to sink the tank. Ballast level inside <br /> all tank compartments should not be more than 12" <br /> above ground water level outside tank <br /> (see Figure I-6). <br /> 2nd 12"Lift Figure 16 <br /> 7 <br /> \/\\\ 11t 12"Lift \/\\j ��\��� <br /> ' 12"max. <br /> \jjAA� <br /> Backfill Bed- Dry Hole Wet Hole <br /> \\ \\ 12"-24" 18"-24" <br /> \� 18"-24"Baffin Bed <br /> Do not strike the tank with the probe or tank • Backfill to the tank top. <br /> damage may result. <br /> • Take the Third Vertical Diameter Measurement and <br /> • Eliminate all voids by using a long handled probe to record the value on the Tank Installation Checklist and <br /> push backfill: verify measurement A does not exceed the value in <br /> Table 1-1. (see Figure 1-7). <br /> - Completely beneath tank bottom. <br /> - Completely between the 5 o'clock and 7 o'clock Figure I-7 <br /> positions along the entire length of the tank between Th I IrdWrtical,Diameter Measurement <br /> and around all ribs and endcaps. It is critical to tank <br /> performance that this area offers full support under <br /> the tank and end caps(see Figure 1-5). Backfill to <br /> Tank Top \/\\ <br /> • Repeat this process with a second 12"lift. �i��i <br /> Figure 1-5 \� �/ <br /> Right �� Wrong % <br /> /\\ /�\ ....-... <br /> .................... <br /> .......... <br /> \\ <br /> ........... <br /> ........................................ <br /> ........... <br /> Measure from the bottom of the tank <br /> to the bottom of the fitting <br /> 20 <br />