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H. KLEINFELDER& ASSOCIATES <br /> If we make the assumption that the volume of influence of the <br /> contamination spill can be approximated as a cylinder with diameter (D) <br /> and length (L), the total mass may be calculated as follows: <br /> NJ <br /> cli YU-1Y1111 0 <br /> s .......(4) <br /> 4 <br /> From Plate 3, D can be approximated as 40 feet while the thickness of <br /> contamination is approximately 15 feet (i.e., L = 15 ft). Based on an <br /> average dry soil density of 2.6 and an average soil porosity of 35%, <br /> Equation 4 can now be used to calculate the total amount of gasoline in <br /> the soil from the concentration data. Based on 16 boring concentrations, <br /> the total amount of gasoline -is estimated to be about 855 lbs. The <br /> percentage error of this estimate may be as high as 30-40%. <br /> 41-87-137 13 <br />