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• 11/17/98 17:06 TITABBER 4 444 NO.042 P005 CALCULATION AND COMPARISON excavation for the new tank leafing as much backfill as possible 1. Subtract reading"B"from reading'q. around existing tanks.It may be necessary to install shoring to make sure that existing tanks do not move and that sufficient back• 2. Compare this value to the table Of Maximum Allowable fill remains.The new tank must be installed by following the Deflections shown on the Installation Checklist. procedures in this guide.Rememberto leave a minimum of 18 3. Vertical deflection in excess of these values indicates improper inches between tanks.The backfill material must he the same as installation and voids the tank warrardy, that speed in Section 3. 14. MONITORING NEM02 SINGLE WALL TANKS ' Single wall tank installations may require release detection monitor- ing,which can include inventory control,automatic tank gauging, vapor monitoring or ground water monitoring.Check with federal, state,and local officials for requiremerb in your area. _ DOUBLE WALL TANKS Xerxes'double wall tank has an interstitial space for the comain- ment of leaked product from the primary tank.The tank,as supplied,will have a minimum of one monitor fitting that provides FIGURE 15-2 access into the space between the primary(internal)and secondary (external)tank walls.If a double wall tank is sloped,the monitor should be at the low end. WITH A DRV INTERSTITIAL SPACE The monitoring system and method is the responsibility of the tank PLANTS- owner and/or operator.A safe electronic or mechanical system Anaheim California,7114/I530-0012 should be used to detect either incoming water or product.The RUC 714/632-7133 monitor system should detect leakage near the bottom of the tank. Avon,Ohio,216/327-6051 Monitoring can be done through the monitor fitting provided.It the FAX 216/327-6071 tank is sloped,the lowest elevation must be the monitoring end. • WITH LIQUID FILLED INTERSTICE—TRU*NEK` Hagerstown,Maryland,301/223-6933 In a liquid filled monitoring system,the interstitial space is filled FAX:301/223-6836 with liquid at the point of manufacture(except 25,000 and Florida,Lake",30,OOo- ta4vd, 813/665-1471 gallon tanks).The system ides provcontinuous leak protection and TAX: ,Flori 5-1695 it enables the owner to conduct a tank tightness test,it also pro vides the ability to use an electronic reservoir monitoring system. Seguin.Texas,210/372-0090 I AX:210/372.0321 15. ADDING LOCATIONS Tipton,Iowa,319/886-6172 Additional Xerxes tanks can be installed at existing locations if FAX.319/886-2042 proper foundation support exists.The method of installation is the responsibility of the owner.it is required,however,dim ore of the following methods be used.The preferred method is to install a new tank in a separate Irak at least 3 feet from the original hole. Caution must be exercised in keeping unusual surface loads off _.. existing tanks.The natural harrier of undisturbed soil between tanks must be maintained. ,�. AEf11o0 i MFIGURE 15.1 If this me0lod is not practical,additional tanks may be buried in i the same installation hole.After emptying existing tanks to less than -quarter capacity,remove the surface slab.Enlarge the