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16.1.7. Measure the sump to ensure it is the correct length for 17.ADDING TANKS AT EMSTING LOCATIONS intended burial depth.For further instructions,see the Xerxes 17.1. GENERAL supplement applicable for the specific containment sump being installed.See SECTION 20 for list of supplements. 17.1.1.Additional Xerxes tanks may be installed at existing lo- cations if proper foundation support exists. 16.2 FINAL CONTAINMENT SUMP INSTALLATION 17.1.2.Backfill support around the existing tanks must not be CAUTION disturbed. Make sure that no heavy objects are allowed to distort the 17.1.3.It is the responsibility of the tank owner to choose the containment sump top after final assembly.This includes the method of installation. street box and concrete pad.No weight should be trans- ferred to the tank.Failure to follow this caution may result in 17.1.4.Xerxes requires that one of the following methods be used. property damage. 17,2. PREFERRED METHOD 16.2.1. Backfill to the top of the containment sump system. 17.2.1.The preferred method is to install new tank(s)in a sep- 16.2.2. Backfill around the outside edge of the containment arate hole if space allows and/or if existing tank(s)must re- sump,making sure that no backfill is on top of the contain- main in service during installation of the new tank(s).The ment sump.See FIGURE 16-1,Area A. preferred method is described here.See FIGURE 17-1. 16.2.3. Isolate the containment sump from all traffic loads. 16.2.3.1.The contractor must install a concrete form/barrier to 36' allow a minimum 3-inch clearance between any load-bearing i aiyNr. item(for example,the concrete pad/street-box frame)and the containment sump top. No backfill on top of containment sump - l Surface Pad Street Box Barrier Backfill - - - ❑0 © ❑A _. FIGURE 17-1 17.2.1.1.Install a new tank in a separate hole at least 3 feet from the original hole. 17.2.1.2.Follow procedures outlined in this Installation Manual. 17.2.1.3.Keep heavy and/or unusual surface loads off existing Typical Installation tanks when excavation hole is open. (watertight rover shown) 17,2,1,4.Maintain the natural barrier of undisturbed soil be- tween tanks. 17.2.1.5.See SECTION 7.5.for minimum spacing require- ments between tanks. NOTE:Sufficient soil must remain between the excavations so that the backfill in the original excavation does not shift. FIGURE 16-1 16.2.3.2.Typically,a sheet of plywood(or other material)is 17.3. ALTERNATE METHOD used as a barrier and is set on the backfill to ensure that there 17.3.1.If the preferred method outlined above is not possible is at least a 3-inch clearance above the containment sump or practical,an alternate method is described here.See FIG- top.See FIGURE 16-1,Area B. URE 17-2. 16.2.4.Choose a street-box size that allows enough clearance around the containment sump top opening for proper opera- tion of the cover. III 16.2.5.Set the street box,and check for clearance to allow access and space to remove the watertight cover.See FIG- URE 16-1,Area C. 16.2.6.Continue with backfill,as required,to subgrade.See FIGURE 16-1,Area A. 16.2.7.Maintain good drainage of water away from the access opening of the containment sump top when installing the sur- FIGURE 17-2 face pad.See FIGURE 16-1,Area D. 17.3.1.1.Bury additional tanks in the same installation hole. 24