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1 <br />' .� FORMER STOCKTON PLATING FACILITY <br /> 632 South El Dorado Street, Stockton, California <br /> tAssumptions <br />' • The distribution of hydrocarbon concentrations on the site can be approximated by an <br /> cylinder (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 /> I1 rZ x depth <br />' 3 14 x 20 feet 2 x 15 feet = 18,849 5 feet' <br /> 18,849 5 feet' --27 feet'/yard = 698 yards' <br /> 698 yards' x 764,550 cm3/yards3 =533,756,5918 cm3 <br />' 533,756,591 8 cm3 x 1 5 grams/cm = 8 x 108 grams soil <br /> average concentration= 5297 5 mg/kg or 0 0052975 umtless <br /> 0 00052975 unitless x 8 x 101 grams soil =424,136 grams gas or 424 kg <br /> soil (saturated) <br /> II r2 x depth= 69,115 feet' <br /> 3 14 x 20 feet z x 55 feet= 69,115 feet3 <br />' 69,115 feet' — 27 feet'/yard=2,559 8 yards' <br /> 2,559 8 yards' x 764,550 cm3/yards3 = 1,95,7,107,503 cm3 <br /> 1,95,7,107,503 cm3 x 1 5 grams/cm =2 9 x 101 grams soil <br />' average concentration= 753 8 mg/kg or 0 0007538 unitless <br />' 0 0007538 umtless x 2 9 x 109 grams soil grams soil = 2,186,020 grams gas or 2,186 kg <br /> I <br />