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Am) <br /> MASSNOLUME OF MTBE IN GROUND WATER <br /> Tracy Marine Sales <br /> 2353 Toste Road, Tracy, California <br /> VOLUME CALCULATIONS <br /> Approximate areal distribution(from drafting software) = 11,000 square feet <br /> Approximate vertical extent=vertical column of water in shallow screened wells = 22 feet* <br /> Approximate area of MTBE-impacted ground water=220,000 cubic feet (ft3) <br /> Average porosity of soil = 20% <br /> Volume of MTBE-impacted ground water=(220,000 ft3 x 0.20) =44,000 ft' <br /> 44,000 ft' x 7.48 gallons/ft3 = 329,000 gallons = 1,250,000 liters impacted water <br /> MASS CALCULATIONS <br /> Volume of contaminated water= 1,250,000 liters <br /> Average concentration of MTBE in ground water=7,760 micrograms per liter* <br /> Mass of contaminants=volume of contaminated water x average concentration of TPH-g <br /> L <br /> 1,250,000 liters impacted ground water x 7,760 micrograms/liter= 9.67 kilograms (kg) TPH-g <br /> 9.67 kg TPH-g=21.3 pounds or approximately 3.4 gallons MTBE <br /> *Based on data collected during July 2003 ground water monitoring event <br /> C. <br /> { <br /> i" <br /> 4 <br /> L <br />