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i <br /> 1 <br /> Estimation of intiai mss of TPH,as gasoline <br /> Moore Petroleum,1399 E Yosemite Ave,Manteca,CA <br /> ' concentrations for each contour interval volume are listed in Table AR I <br /> One of the final steps in this estimation process is to calculate the approximate mass of TPK as <br /> ' gasoline,per contour volume This is accomplished by multiplying the average concentration per <br /> contour volume, in milligrams per kilogram,by the mass of soil per contour volume, in kg In <br /> reference to Figure 5C,the approximate mass of TPR as gasoline,per contour volume for the <br /> interval volume between the approximate zero line and the 500 mg/kg contour line is <br /> Mass of TPHg (mg) = 250 kgxb1,000 kg = 15,000,000 <br /> g <br /> This process may be applied for each contour interval volume <br /> Once the mass of contaminate is known for each contour interval volume in milligrams, this <br /> number should be converted to units of pounds In reference to Figure 5C,the approximate mass <br /> of TPK as gasoline, for the contour volume between the approximate zero line and the 500 <br /> mg/kg contour line is <br /> X 2 2046E-06 lb = 33 lb <br /> ' Mass of TPHg (lb) = 15,000,000 mg 1 kg <br /> This method maybe applied to all contour interval volumes Indmdual mass values for each <br /> contour volume may then be summed and the result will be an estimate for the approximate mass <br /> of TPH, as gasoline, in soil at the subject site These results are included in Table AR 1 The <br /> ' results of this estimation process yields an estimate of 590 pounds of TPR as gasoline, initially <br /> present <br /> 1 <br />