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CALCULATION OF HYDROCARBON MASS ADSORBED TO SOIL <br /> Arco 4932 <br /> 16 E Harding Way <br /> Stockton, California <br /> Average soil concentration was based on soil samples from borings EW-1 and MW-4 and from excavation <br /> samples D1, D2,D4, D5, PL-1,and PL-6 collected at depth ranging from ground surface to 25 feet bgs <br /> Average soil density is based on soils generally being classisified as sands or clay beneath the site <br /> Average concentration was calculated using the laboratory reporting limit as the concentration in samples <br /> where the concentration was reported as nondetect <br /> AREA 1 2,585 sq ft area from 0 to 25 ft bgs area where vertical irugration of release is assumed to <br /> have occurred beneath the dispensers <br /> Estimated avg TPHg concentration is 1,488 mg/kg <br /> Estimated avg benzene concentration is 4 mg/kg <br /> Estimated avg MtBE concentration is 121 mg/kg <br /> CONTAMINANT TPHg Benzene MtBE <br /> X-CONTAMINANT CONCENTRATION (mg/kg) = 1,488 4 121 <br /> D- AVERAGE SOIL DENSITY (lbs/ft/13) = 100 100 100 <br /> A-IMPACTED AREA(ft^2) = 2,585 2,585 2,585 <br /> H-HEIGTH OF IMPACTED AREA(ft) = 25 25 25 <br /> P-POUNDS OF CONTAMINANT (lbs) = 9,615 28 782 <br /> Estimated Total Mass of Adsorbed Hydrocarbons: 10,424 pounds <br /> Estimated Volume of Adsorbed Hydrocarbons: 1,489 gallons <br /> arew=s wk4 <br />