COMPLIANCE INFO_1999-2007 - Laserfiche WebLink

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0 0 4.Measure the distance from the tank top(inside)to the top of 36• METHOD 1 the standpipe.Subtract 1 inch from this measurement and record the distance. 5.Subtract the second distance from the first and record this value as reading`B"on the Installation Checklist. CALCULATION AND COMPARISON 1.Subtract reading`B"from reading"A". 2.Compare this value to the table of Maximum Allowable gill 011111mill 011 11110 Deflections shown on the Installation Checklist. FIGURE 15-1 3.Vertical deflection in excess of these values indicates improper If this method is not practical,additional tanks may be buried in installation and voids the tank warranty. the same installation hole.After emptying existing tanks to less ® ®® than one-quarter capacity,remove the surface slab.Enlarge the excavation for the new tank,leaving as much backfill as possible around existing tanks. It may be necessary to install shoring to SINGLE WALL TANKS make sure that existing tanks do not move and that sufficient Single wall tank installations may require release detection backfill remains.The new tank must be installed by following the monitoring,which can include inventory control,automatic tank procedures in this guide. Remember to leave a minimum of 18 gauging,vapor monitoring or ground water monitoring.Check inches between tanks.The backfill material must be the same as with federal,state,and local officials for requirements in your that specified in Section 3. area. DOUBLE WALL TANKS Xerxes double wall tank has an interstitial space for the METHOD 2 containment 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 FIGURE 15-2 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 INTERSTITIAL SPACE In a liquid-filled monitoring system,the interstitial space is filled with liquid at the point of manufacture.The system enables the owner to have continous monitoring or to conduct a tank tightness test(Tru Check®).It also provides 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.