Laserfiche WebLink
Tank Installation (Additional Instructions for Wet Hole Installation) <br /> • 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 t <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 of tank <br /> eliminating all voids, so the tank is fully supported when adding ballast As the tank nears full,reduce the <br /> (see Figure 1-4). fill rate to prevent pressurization or tank damage may <br /> Figure 1.4 occur. This may result In personal Injury or <br /> property damage. <br /> Long Handled Probe Ballast the tank K ground water cannot be lowered. <br /> For compartment tanks, add ballast to <br /> compartments as needed to keep tank level.Add <br /> 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 1-6). <br /> Figure 1.8 <br /> X// I� 2nd 12"Lift \/ <br /> /\ <br /> \\ 1"12"Lift 12"max. <br /> //\ <br /> \/\ Backfill Bed Dry Hole Wet Hole /\\j <br /> 12"-24" 18"-24" \//\\� �. / <br /> -46 <br /> 18"-24"Backfill Bed <br /> Do not strike the tank with the probe or tank • Backfill to the tank top. <br /> damage may result. • 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 does not exceed the value in <br /> p Table 1-1. (see Figure 1-7). <br /> - Completely beneath tank bottom. <br /> - Completely between the 5 o'clock and 7 o'clock Figure 1-7 <br /> positions along the entire length of the tank between Third Vertical Diameter Measurement <br /> and around all ribs and endcaps. It is critical to tank <br /> performance that this area offers full support under BaGkfi <br /> the tank and end caps(see Figure I-5). TankTIOP <br /> • Repeat this process with a second 12"lift. <br /> Figure 1-5 <br /> 3 <br /> Right Wrong <br /> y <br /> Measure from the bottom of the tank <br /> `.� to the bottom of the fitting <br /> 20 <br />