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SOIL MASS BALANCE CALCULATIONS <br /> Soil mass balance calculations were determined with the following assumptions: <br /> • Approximate extent of soil affected by petroleum hydrocarbons was based on soil <br /> results (Table 2, in main body of text) from previous investigations at the Site. <br /> • Soils affected by petroleum hydrocarbons is homogenous in extent. <br /> • Impacted volumes were determined from only the soil borings within the impacted <br /> area (see Figures 7, 8, and 9, in main body of text). All other soil samples outside this <br /> area of extent were not used in calculating the mass. <br /> • Each soil boring was considered to be within the impacted are, if any of the <br /> constituents of any soil sample collected from that boring exceeded the analytical <br /> reporting limits (ARLs). Each soil sample was considered to be within the impacted <br /> area, if any of the constituents exceeded the ARLs <br /> • Benzene and Total Petroleum Hydrocarbons as Gasoline (TPH-G) were used to <br /> calculate the total mass in soil prior to remediation. Benzene is a known carcinogen <br /> and a priority risk assessment constituent. Concentrations of TPH-G are the largest at <br /> this Site and therefore, would calculate the largest mass. <br /> • Impacted soil volumes were calculated using best fit rectangles, based on the ranges <br /> specified in Table D-1. Each mass was calculated using the maximum concentration <br /> within the range, except for the range which contained the maximum concentration of <br /> the data set. The maximum concentration was used in calculating the mass for the <br /> last range. <br /> • A typical unit weight of 130 (lb/ft3) was used based on a mixed soil of sandy to silty <br /> clay. <br />