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VILLAGE WEST MARINA August 28, 1997 <br /> 6649 Embarcadero Drive,Stockton <br /> Estimated Mass Calculations for Gasoline Released into Possible Migratory Pathway <br /> by Two, 10,000-gallon Capacity USTs. Possible pathway is depicted on Figures 5 and 6. <br /> INPUT DATA <br /> Original estimated thickness of impacted interval= 1.0±foot <br /> Approximate thickness of"smeared" interval after winter recharges <br /> to water table (see Figure 6): 3.0±feet <br /> Estimated surface area of possible gasoline migratory path (see Figure 5): 3200 square feet <br /> Estimated volume of impacted interval prior to rise of water table: 3200 cubic feet <br /> Estimated volume of"smear" interval after winter recharge to water table: 9600 cubic feet <br /> Approximated bulk density of clayey silt: 84 lb./cu. ft. <br /> Mean TPH-gasoline concentration in MW-6 from 17-20 feet bsg in path: 1.92 mg/L <br /> Weight of one cubic foot of gasoline =_60 Ib.; 7 gallons of gasoline per cubic foot. <br /> CALCULATIONS <br /> Weight estimate(in tons)of"smeared"soil in possible migratory path impacted by dissolved-phase <br /> gasoline: <br /> ((9600 cfl(84 lb/cfl(1.92 mg/L)=774.1 <br /> 2000 lb/ton <br /> Mass of estimated gasoline released by two IOK USTs(in total gallons)into the possible migratory path: <br /> ((3200 cl)(84 Ib)(1.92mg/L))-(60 lb/c1228.8 <br /> 7 gal/cf <br />