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ESTIMATION OF HYDROCARBONS REMAINING IN SOIL <br />' Former Exxon Service Station No. 7-3330 <br /> 3128 West Benjamin Holt Drive <br /> Stockton, California <br />.Assumption: <br /> 1. Inferred lateral extent of impacted soil is illustrated on Figure 10. <br /> 2. Average depth of ground water = 12.5. <br /> 3. Thickness of hydrocarbon layer of impacted soil is 6 - 12.5 feet = H = 6.5 feet. <br /> 4. Average weight per cubic foot of soil = 110 lbs/ft3. <br /> 5. Estimation of hydrocarbons remaining in soil is based on a model illustrated in Figure 12. <br /> I Estimation of TPH as Gasoline Remaining is Soil <br /> 1(A) Calculations: Soil Around PL-1 <br /> (1) _ 5-15± (6.5 110 lbs (25 ppm <br /> 8 ft3 1 x l06 <br /> I • <br /> = 0.175 lbs <br /> (2) 7C (10)2 (5)2 (6.5� 110 lbs) 12.5 ppmv <br /> 8 8 ft3 1x106 <br /> = 0.26 lbs <br /> Total = 0.175 lbs + 0.26 lbs — 0.44 lbs <br /> • <br /> xProox.sio <br />