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• Table D-1. Soil Mass Balance Calculation Results <br /> Impacted Concentration Calculated Total Mass <br /> Soil Volume Ranges Concentration Mass Removed <br /> (ft') Constituent (mg/kg) (mg/kg) (lbs) (a) (lbs) <br /> 194,650 Benzene 0.5-5 5 127 <br /> 450 Benzene 5-50 50 3 <br /> 500 Benzene X50 220 14 <br /> 144 153 <br /> 190,600 TPH-G 50-500 500 12,389 <br /> 4,000 TPH-G 500-5,000 5,000 2,600 <br /> 1,000 TPH-G X5,000 17,000 2,210 <br /> 17,199 50,862 <br /> (a) Mass (lbs) = Impacted Soil Volume (ft) * Unit Weight of Soil (lb/ft3) <br /> Concentration (mg/kg) *[10-3 g/mg/103 g/kg] <br /> Groundwater Mass Balance Calculations <br /> Groundwater mass balance calculations were determined with the following assumptions: { <br /> • Approximate extent of groundwater affected by petroleum hydrocarbons was based <br /> on quarterly groundwater results since October 1992 (Table 3, in main body of text). <br /> The startup of the Groundwater Extraction Treatment System (GWETS) was on <br /> October 14, 1992. <br /> • Groundwater affected by petroleum hydrocarbons is homogenous in extent. <br /> • Impacted groundwater volumes were determined from only the wells within the <br /> impacted area (see Figure 7, in main body of text). All other well samples outside <br /> this area of extent were not used in calculating the mass. <br /> • Each well was considered to be within the impacted are, if any of the constituents of <br /> any groundwater sample collected from that well exceeded the analytical reporting <br /> limits (ARLs). Each well was considered to be within the impacted area, if any of the <br /> constituents exceeded the ARLs. <br /> I <br />