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16.5.3.Set the cover on the opening and seat it in place. 16.6.5.Set the street box,and check for clearance to allow access and space to remove the watertight cover.(See FIGURE 16.5.4.Open the clamping ring and fit it around the cover and 16-8,Area C.) top lip of the opening. 16.6.6.Continue with backfill,as required,to subgrade.(See 16.5.5.Slowly close the clamping ring with the lever making FIGURE 16-8,Area D.) sure both the cover edge and top lip are caught in the ring groove.Lock the lever in place. 16.6.7.Maintain good drainage of water away from the access CAUTION opening of the containment sump top. Do not force the clamping ring closed,or minor or moderate 17. ADDING TANKS AT EXISTING LOCATIONS injury may occur.If the clamping ring binds,rotate the cover and ring,and try again. 17.1.GENERAL 17.1.1.Additional Xerxes tanks may be installed at existing Note: The gasket in the watertight cover requires periodic locations if proper foundation support exists. replacement. 17.1.2.It is the responsibility of the tank owner to choose the 16.6.FINAL CONTAINMENT SUMP INSTALLATION correct method of installation. CAUTION 17.1.3.Xeres requires that one of the following methods be used. Make sure that no heavy objects are allowed to distort the 17.2.PREFERRED METHOD containment sump top after final assembly. This includes 17.2.1.The preferred method(FIGURE 17-1)is: the street box and concrete pad.No weight should be Install a new tank in a separate hole at least 3 feet from the transferred to the tank.Failure to do so may result in original hole. property damage. Follow procedures outlined in this Installation Manual. 16.6.1.Backfill to the top of the containment sump system. Exercise caution in keeping unusual surface loads off existing tanks. 16.6.2.Backfill around the outside edge of the containment Maintain the natural barrier of undisturbed soil between tanks. sump,making sure that no backfill is on top of the containment sump.(See FIGURE 16-8,Area A.) 36" Backfill Street Boz Barrier o Q, B 34 iFIGURE 17-1 Top of containment A sump system Typical Installation Backfill (watertight cover 17.3.ALTERNATE METHOD No Backfill shown) 17.3.1. If the referred method outlined above is not practical, on top of P containment sump an alternate method(FIGURE 17-2)is: Bury additional tanks in the same installation hole. • Empty existing tanks to less than 1/4 capacity. • Remove the surface slab. FIGURE 16-8 Enlarge the excavation for the new tanks,leaving as much backfill as possible around existing tanks. 16.6.3.Isolate the containment sump from all traffic loads. Install shoring,if necessary,to make sure that existing tanks 16.6.3.1.The contractor must install a concrete form/barrier to do not move and sufficient backfill remains. allow a minimum 3-inch clearance between any load-bearing Follow procedures and requirements outlined in this Installa- item(for example,the concrete pad/street-box frame)and the tion Manual. containment sump top. See SECTION 5 for excavation parameters. 16.6.3.2.Typically,a sheet of plywood(or other material)is used as a barrier and is set on the pea gravel to ensure that there is at least a 3-inch clearance above the containment sump top. (See FIGURE 16-8,Area B.) 16.6.4.Choose a street-box size that allows enough clearance around the containment sump top opening for proper operation of the cover. FIGURE 17-2 25