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0 <br /> 4.Measure the distance from the tank top(inside)to the top of 36- METHOD 1 <br /> the standpipe.Subtract 1 inch from this measurement and <br /> record the distance. <br /> 5.Subtract the second distance from the first and record this <br /> value as reading`B"on the Installation Checklist. <br /> CALCULATION AND COMPARISON <br /> 1.Subtract reading`B"from reading"A". <br /> 2.Compare this value to the table of Maximum Allowable <br /> Deflections shown on the Installation Checklist. FIGURE 15-1 <br /> 3.Vertical deflection in excess of these values indicates improper If this method is not practical,additional tanks may be buried in <br /> installation and voids the tank warranty. the same installation hole.After emptying existing tanks to less <br /> ®, than one-quarter capacity, remove the surface slab.Enlarge the <br /> excavation for the new tank,leaving as much backfill as possible <br /> SINGLE ANLL TANKS around existing tanks. It may be necessary to install shoring to <br /> make sure that existing tanks do not move and that sufficient <br /> Single wall tank installations may require release detection backfill remains.The new tank must be installed by following the <br /> monitoring,which can include inventory control,automatic tank procedures in this guide.Remember to leave a minimum of 18 <br /> gauging,vapor monitoring or ground water monitoring.Check inches between tanks.The backfill material must be the same as <br /> with federal,state,and local officials for requirements in your that specified in Section 3. <br /> area. <br /> DOUBLE WALL TANKS <br /> Xerxes double wall tank has an interstitial space for the METHOD 2 <br /> containment of leaked product from the primary tank.The tank, <br /> as supplied,will have a minimum of one monitor fitting that <br /> provides access into the space between the primary(internal) <br /> and secondary(external)tank walls. If a double wall tank is <br /> sloped,the monitor should be at the low end. <br /> WITH A DRY INTERSTITIAL S C <br /> The monitoring system and method is the responsibility of the <br /> tank owner and/or operator.A safe electronic or mechanical FIGURE 1 -2 <br /> system should be used to detect either incoming water or <br /> product.The monitor system should detect leakage near the <br /> bottom of the tank.Monitoring can be done through the monitor <br /> fitting provided.If the tank is sloped,the lowest elevation must be <br /> the monitoring end. <br /> Anaheim,California,714/630-0012 <br /> WITH LIQUID-FILLED INTERSTITIAL SP C FAX: 714/632-7133 <br /> In a liquid-filled monitoring system,the interstitial space is filled <br /> with liquid at the point of manufacture.The system enables the Avon,Ohio,216/327-6051 <br /> owner to have continous monitoring or to conduct a tank FAX: 216/327-6071 <br /> tightness test(Tru Check®). It also provides the ability to use an <br /> electronic reservoir monitoring system. <br /> Hagerstown,Maryland,301/223-6933 <br /> ®® FAX: 301/223-6836 <br /> Additional Xerxes tanks can be installed at existing locations if <br /> proper foundation support exists.The method of installation is the Lakeland,Florida,941/665-1471 <br /> responsibility of the owner. It is required, however,that one of the FAX: 941/665-1695 <br /> following methods be used.The preferred method is to install a <br /> new tank in a separate hole at least 3 feet from the original hole. <br /> Caution must be exercised in keeping unusual surface loads off Seguin,Texas,210/372-0090 <br /> existing tanks.The natural barrier of undisturbed soil between FAX: 210/372-0321 <br /> tanks must be maintained. <br /> - Tipton, Iowa,319/886-6172 <br /> FAX: 319/886-2042 <br />