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' CALCULATION OF HYDROCARBON MASS ADSORBED TO SOIL <br /> F ,Cbevron Station#9-2396 <br />' 25651 North Highway 99 <br /> Acampo, CA <br /> These mass calculations were conducted based on historical data presented in "Tank Removal Report" <br /> dated September 20, 1993, and "Tank Removal and Excavation Report" dated February 10, 1994 <br /> AREA 1 4,800 sq ft area from 0 to 20 ft bgs minus the excavation for the tanko <br /> p it f <br /> 1,500 square feet <br /> Estimated average TPHg concentration is 36 6 mg/kg <br /> 1,500 square feet of soil was excavated in 1993,which included the samples <br /> with 410 mg/kg This sample was not used to calculate the average TPHg <br /> concentration <br /> Total Mass =(D A H X) 10 <br />'• =(129 lb/ft' *3,300 ft' * 37 mg/kg* 10-6) <br />' =312 lbs <br />' CONTAMINANT TPHg <br /> X-CONTAMINANT CONCENTRATION(mg/kg) = 37 <br /> D -AVERAGE SOIL DENSITY(lbs/ft' = 129 <br />' A-IMPACTED AREA(ft) = 3,300 <br /> H-HEIGHT OF IMPACTED AREA(ft) = 20 <br /> P-POUNDS OF CONTAMINANT(lbs) = 312 <br /> Estimated Total Mass of Adsorbed Hydrocarbons: 312 pounds <br /> IEstimated Volume of Adsorbed Hydrocarbons: 45 gallons <br />