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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,MW-1,MW-2,MW-4,DMW-1, <br /> SVE-1,and SB-2 and from excavation samples D3,PL-2, PL-3,PL-5,VL-1, VL-3, VL-4, and VP-1 <br /> collected at depth 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 linvt as the concentration in samples <br /> where the concentration was reported as nondetect <br /> AREA 2 16,238 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 soil volume in area 1 (2,585 feee x 25 feet) <br /> Estimated avg TPHg concentration is 39 mg/kg <br /> Estimated avg benzene concentration is 0 24 mg/kg <br /> CONTAMINANT TPHg Benzene <br /> X-CONTAMINANT CONCENTRATION(mg/kg) = 39 4 <br /> D-AVERAGE SOIL DENSITY(lbs/ft^3) = 100 100 <br /> A-IMPACTED AREA (ft"2) = 16,238 16,238 <br /> H-HEIGTH OF IMPACTED AREA(ft) = 50 50 <br /> VOLUME OF AREA(ft^3) = 811,900 811,900 <br /> VOLUME OF AREA 1 (ft^3) = 64,625 64,625 <br /> VOLUME OF AREA 2-VOLUME OF AREA 1 = 747,275 747,275 <br /> P-POUNDS OF CONTAMINANT(lbs) = 2,914 321 <br /> Estunated Total Mass of Adsorbed Hydrocarbons. 3,235 pounds <br /> Estimated Volume of Adsorbed Hydrocarbons- 462 gallons <br /> s wk <br />