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AB ;CISION ENVIRONMENTAL TANK TE;. .AG 10 <br />OVERCOMING UNDERGROUND WATER PRESSURES FOR.HYDROSTATIC TANK TESTING <br />WITH AN INTERNAL ADVANTAGE OF 1.5 PSI <br />X = UNDERGROUND WATER LEVEL MEASURED FROM TOP OF GRADE TO TOP OF WATER <br />Y = TOTAL NUMBER OF INCHES OF PRODUCT BELOW GRADE (FILLPIPE + TANK DIA) <br />Z = STANDPIPE IN INCHES ABOVE GRADE FILLED WITH PRODUCT <br />I = WATER INTERFACE POINT <br />W = INSPECTION WELL, WELL POINT ECT ... (VISIBLE WATER LEVEL) <br />R = PRODUCT WEIGHT eD.1 PSI/IN <br />Lis 14 <br />(Loa) -Roo <br />PRODUCT WEIGHTS PSI <br />GASOLINE KEROSINE FUEL OIL DIESEL OIL WATER <br />.026 .029 .031 .031 .036 <br />