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• CALCULATION AND COMPARISON excavation for the new tank,leaving as much backfill as possible 1. Subtract reading"B"from reading"F1'. 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. Remember to leave a minimum of 18 3. Vertical deflection in excess of these values indicates improper inches between tanks.The backfill material must be the same as installation and voids the tank warranty. that specified in Section 3. 14. MONITORING plep, SINGLEWALLTANKS �) o 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 requirements in your area. _ DOUBLE WALL TANKS Xerxes double wall tank has an interstitial space for the contain- _ ment of leaked product from the primary tank.The tank,as — supplied,will have a minimum of one fitting that provides access into the space between the primary(internal)and secondary (external)tank shell walls. If a double wall tank is sloped,the monitor should be at the low end. WITH A DRY INTERSTITIAL SPACE MANUFACTURING PLANTS: The monitoring system and method is the responsibility of the tank owner and/or operator.A safe electronic or mechanical system Anaheim Cafdomia,714/630-0012 should be used to detect either incoming water or product.The FAX:714/632-7133 monitor system should detect leakage near the bottom of the tank. Monitoring can be done through the access fitting provided.If the Avon,Ohio,216/327-6051 tank is sloped during installation the lowest elevation must be the FAX:216/327-6071 monitoring end. Hagerstown, Maryland,301/223-6933 TRU-CHEK'" HYDROSTATIC MONITORING SYSTEM FAX:301/223-6836 In a liquid filled monitoring system,the interstitial space is filled Lakeland,Florida,813/665-1471 with liquid at the point of manufacture(except 25,000 and 30,000- FAX: ,Flori a,813 gallon tanks).The system provides continuous leak protection and 695 it enables the owner to conduct a tank tightness test It also North Ridgeville,Ohio,216/327-6051 provides the ability to use an electronic monitoring system. FAX:216/327-6071 15. ADDING TANKS AT EXISTING LOCATIONS Seguin,Texas,512/372-0090 FAX:512/372-0321 Additional Xerxes tanks can be installed at existing locations if proper foundation support exists.The method of installation is the Tipton,Iowa,319/886-6172 responsibility of the owner. It is required,however,that one of the FAX:319/886-2042 following methods be used.The preferred method is to install a new tank in a separate hole at least 3 feet from the original hole. Caution must be exercised in keeping unusual surface loads off existing tanks.The natural barrier of undisturbed soil between . tanks must be maintained. 36" 'I 11 I lal—Ilfll !I - II —'I li h h-i II If this method is not practical,additional tanks may be buried in the same installation hole.After emptying existing tanks to less than one-quarter capacity,remove the surface pad.Enlarge the