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16.5.3. Set the cover on the opening and seat it in place. <br />16.5.4. Open the clamping ring and fit it around the cover and <br />top lip of the opening. <br />16.5.5. Slowly close the clamping ring with the lever making <br />sure both the cover edge and top lip are caught in the ring <br />groove. Lock the lever in place. <br />CAUTION <br />Do not force the clamping ring closed, or minor or moderate <br />injury may occur. if the clamping ring binds, rotate the cover <br />and ring, and try again. <br />Note: The gasket in the watertight cover requires periodic <br />replacement. <br />16.6. FINAL CONTAINMENT SUMP INSTALLATION <br />CAUTION <br />Make sure that no heavy objects are allowed to distort the <br />containment sump top after Lina/ assembly. This includes <br />the street box and concrete pad. No weight should be <br />transferred to the tank. Failure to do so may result in <br />property damage. <br />16.6.1. Backfill to the top of the containment sump system. <br />16.6.2. Backfill around the outside edge of the containment <br />sump, making sure that no backfill is on top of the containment <br />sump. (See FIGURE 16-8, Area A.) <br />Backfill <br />Street Box Barter <br />D <br />�Ci 8 <br />S <br />Topof containment <br />A <br />sump system <br />Typical Installation Backfill <br />(watertight cover <br />No Backfill <br />shown) <br />on top of <br />containment sump <br />FIGURE 16-8 <br />16.6.3. Isolate the containment sump from all traffic loads. <br />16.6.3.1. The contractor must install a concrete form/barrier to <br />allow a minimum 3 -inch clearance between any load-bearing <br />item (for example, the concrete pad/street-box frame) and the <br />containment sump top. <br />16.6.3.2. Typically, a sheet of plywood (or other material) is used <br />as a barrier and is set on the pea gravel to ensure that there is <br />at least a 3 -inch clearance above the containment sump top. <br />(See FIGURE 16-8, Area 8.) <br />16.6.4. Choose a street -box size that allows enough clearance <br />around the containment sump top opening for proper operation <br />of the cover. <br />25 <br />11 <br />16.6.5. Set the street box, and check for clearance to allow <br />access and space to remove the watertight cover. (See FIGURE <br />16-8, Area C.) <br />16.6.6. Continue with backfill, as required, to subgrade. (See <br />FIGURE 16-8, Area D.) <br />16.6.7. Maintain good drainage of water away from the access <br />opening of the containment sump top. <br />17.1. GENERAL <br />17.1.1. Additional Xerxes tanks may be installed at existing <br />locations if proper foundation support exists. <br />17.1.2. It is the responsibility of the tank owner to choose the <br />correct method of installation. <br />17.1.3. Xerxes requires that one of the following methods be used. <br />17.2. PREFERRED METHOD <br />17.2.1. The preferred method (FIGURE 17-1) is: <br />• Install a new tank in a separate hole at least 3 feet from the <br />original hole. <br />• Follow procedures outlined in this Installation Manual. <br />• Exercise caution in keeping unusual surface loads off existing <br />tanks. <br />• Maintain the natural barrier of undisturbed soil between tanks. <br />FIGURE 17-1 <br />17.3. ALTERNATE METHOD <br />17.3.1. If the preferred method outlined above is not practical, <br />an alternate method (FIGURE 17-2) is: <br />• Bury additional tanks in the same installation hole. <br />• Empty existing tanks to less than 1/4 capacity. <br />• Remove the surface slab. <br />• Enlarge the excavation for the new tanks, leaving as much <br />backfill as possible around existing tanks. <br />• Install shoring, if necessary, to make sure that existing tanks <br />do not move and sufficient backfill remains. <br />• Follow procedures and requirements outlined in this Installa- <br />tion Manual. <br />• See SECTION 5 for excavation parameters. <br />FIGURE 17.2 <br />