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CALCULATION AND COMPARISON excavation for the new tank, leaving as much backfill as possible 1. Subtract reading"B"from reading"A'. 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. MONITORING14. METHOD 2 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 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 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 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 California,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. 1 Monitoring can be done through the monitor fitting provided. If the Avon,Ohio,216/327-6051 tank is sloped,the lowest elevation must be the monitoring end. FAX:216/327-6071 WITH LIQUID FILLED INTERSTICE—TRU-CHEKTM Hagerstown,Maryland,301/223-6933 i 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 30,000- gallon tanks).The system provides continuous leak protection and Lakeland,Florida,813/665-1471 it enables the owner to conduct a tank tightness test. It also pro- FAX:813/665-1695 vides the ability to use an electronic reservoir monitoring system. Seguin,Texas,512/372-0090 FAX:512/372-0321 15. ADDING TANKS AT EXISTING 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,that one of the 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 a tanks must be'maintained. i 36- METHOD 1 i l FIGURE 15-1 \ 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 slab.Enlarge the