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9 CALCULATION AND COMPARISON 1. Subtract reading "B" from reading "A'. 2. Compare this value to the table of Maximum Allowable Deflections shown on the Installation Checklist. 3. Vertical deflection in excess of these values indicates improper installation and voids the tank warranty. 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 WALLTANKS 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 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 The monitoring system and method is the responsibility of the tank owner and/or operator. A safe electronic or mechanical system should be used to detect either incoming water or product. The monitor system should detect leakage near the bottom of the tank. Monitoring can be done through the monitor fitting provided. If the tank is sloped, the lowest elevation must be the monitoring end. WITH LIQUID FILLED INTERSTICE — TRU-CHEKTM In a liquid filled monitoring system, the interstitial space is filled with liquid at the point of manufacture (except 25,000 and 30,000 - gallon tanks). The system provides continuous leak protection and it enables the owner to conduct a tank tightness test. It also pro- vides the ability to use an electronic reservoir monitoring system. Additional Xerxes tanks can be installed at existing locations if 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 tanks must be maintained. FIGURE 151 If this method is not practical, additional tanks may be buried it the same installation hole. After emptying existing tanks to less than one-quarter capacity, remove the surface slab. Enlarge the 0 excavation for the new tank, leaving as much backfill as possible around existing tanks. It may be necessary to install shoring to make sure that existing tanks do not move and that sufficient back- fill remains. The new tank must be installed by following the procedures in this guide. Remember to leave a minimum of 18 inches between tanks. The backfill material must be the same as that specified in Section 3. FIGURE 15-2 Anaheim California, 7141630-0012 FAX: 714/632-7133 Avon, Ohio, 216/327-6051 FAX: 2161327-6071 Hagerstown, Maryland, 3011223-6933 FAX: 301/223-6836 Lakeland, Florida, 813/665-1471 FAX: 813/665-1695 Seguin, Texas, 512/372-0090 FAX: 5121372-0321 Tipton, Iowa, 3191886-6172 FAX: 319/886-2042