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FORMER STOCKTON PLATING FACILITY <br /> 632South El Dorado Street, Stockton, California <br /> Assumptions: <br /> • The distribution ofhydrocarbon concentrations on the site can be approximated by an cylinder <br /> (See Figure 1); and <br /> • The average TPH-g concentration was estimated from data collected at the site and are <br /> believed to be representative of the site: <br /> The area of an cylinder can be calculated by the formula: <br /> soil (vadose) <br /> II r' x depth <br /> 3.14 x 20 feet ',x 15 feet = 18,849.5 feet' <br /> 18,849.5 feet' = 27 feet'/yard = 698 yards' <br /> 698 yards' x 764,550 cm'/yards' = 533,756,591.8 cm3 <br /> 533,756,591.8 cm3 x 1.5 grams/cm= 8 x 10' grams soil <br /> average concentration= 5297.5 mg/kg or 0.0052975 unitless <br /> 0.00052975 unitless x 8 x 108 grams soil =424,136 grams gas or 424 kg <br /> soil (saturated) <br /> II.r- x depth = 69,115 feet' <br /> 69,115 feet' _ 27 feet3/yard= 2,559.8 yards3 <br /> 2,559.8 yards' x 764,550 cm'/yards' = 1,95,7,107,503 cm3 <br /> 1,95,7,107,503 cm' x 1.5 grams/cm=2.9 x 109 grams soil , <br /> average concentration = 753.8 mg/kg or 0.0007538 unitless <br /> 0.0007538 unitless x 2.9 x 109 grams soil grams soil= 2,186,020 grams gas or'2,186 kg <br />