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CALCULATION OF HYDROCARBON MASS DISSOLVED IN GROUNDWATER <br /> ARCO 4932 <br /> 16 E Harding Way <br /> Stockton,CA <br /> These mass calculations were conducted based on Figure 7 and the 2nd quarter 2002 <br /> groundwater sampling data Average concentration was calculated using all wells <br /> at the site <br /> Plume Size Approximately 528 ft X 240 ft area and approximatley 40 ft vertically <br /> Estimated avg TPHg concentration of 40,973 ug/l <br /> Estimated avg Benzene concentration of 1,400 6 ug/1 <br /> Estimated avg MtBE concentration of 41,036 ug/l <br /> CONTAMINANT TPHg Benzene MtBE <br /> X-CONTAMINANT CONCENTRATION(mg/L) = 40 973 14006 41 036 <br /> ` N-POROSTI'Y(%) = 038 038 038 <br /> A-IMPACTED AREA(ft^2) = 126,720 126,720 126,720 <br /> H-HEIGHT OF IMPACTED AREA(ft) = 40 40 40 <br /> P-POUNDS OF CONTAMINANT(lbs) = 4927.13 16843 493471 <br /> Estimated Total Mass of Dissolved Hydrocarbons: 10,030 3 pounds <br /> Estimated Volume of Dissolved Hydrocarbons 1,432.9 gallons <br /> i <br /> areamass wk4 <br /> 1 <br />