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CALCULATION OF HYDROCARBON MASS ADSORBED TO SOIL <br /> r <br /> Arco 4932 <br /> 16 E Harding Way <br /> Stockton,California <br /> Average soil concentration was based on soil samples from borings EW-1,EW-2, MW-4,MW-6, SVE-1, <br /> SB-2,DMW-1, DMW-2, and DMW-3 and excavation samples VL-4 and PL-2 collected at depth <br /> ranging from ground surface to 50 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 3 16,450 sq ft area from 0 to 50 ft bgs area where vertical migration of release is assumed to <br /> have occurred beneath the dispensers minus the volume of area 1 (2,585 square feet x 25 feet) <br /> Estimated avg MtBE concentration is 5 6 mg/kg <br /> ( CONTAMINANT MtBE <br /> 1 <br /> X -CONTAMINANT CONCENTRATION(mg/kg) = 56 <br /> D-AVERAGE SOIL DENSITY(lbs/ft^3) = 100 <br /> A-IMPACTED AREA (ft^2) = 16,450 <br /> H-HEIGTH OF IMPACTED AREA(ft) = 50 <br /> VOLUME OF AREA 3 (ft^3) = 822,500 <br /> VOLUME OF AREA 1 (ft^3) = 64,625 <br /> VOLUME OF AREA 3 -VOLUME OF AREA 1 = 757,875 <br /> P-POUNDS OF CONTAMINANT(lbs) = 424 <br /> Estimated Total Mass of Adsorbed Hydrocarbons. 424 pounds <br /> Estimated Volume of Adsorbed Hydrocarbons: 61 gallons <br /> f amass wk4 - <br />