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Table 8 <br />First Quarter 2015 Total Volatile Organic Compound Mass Estimation Calculations <br />Austin Road Unit - Forward Landfill - Manteca, California <br />Contour Interval (ug/L) <br />1-25 <br />25-31.23 <br />Average TVOC Concentration Within Interval (ug/L) <br />13.00 <br />28.12 <br />Aquifer Area Within Interval (ft) <br />5,608,681 <br />365,755 <br />Aquifer Volume Within Interval (ft) <br />[Aquifer Area (ft2) x Thickness (40 ft)] <br />224,347,240 <br />14,630,186 <br />Aquifer Volume Within Interval (L) <br />[28.317 L/ft3] <br />6,352,840,795 <br />414,282,977 <br />Groundwater Volume Within Interval (L) <br />[Aquifer Volume (L) x Porosity (0.25)] <br />1,588,210,199 <br />103,570,744 <br />TVOC Mass Within Interval (kg) <br />[Average TVOC Concentration (ug/L) x Groundwater <br />20.65 <br />2.91 <br />Volume (L) / 1,000,000,000 ug/kg] <br />Plume -Wide TVOC Mass (kg) <br />23.56 <br />[Sum of All Interval TVOC Masses] <br />Threshold Limit (kg) <br />789.5 <br />Notes: <br />Aquifer areas dervived from Figure 3. <br />