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Table 8 <br />First Quarter 2016 Total VOC Mass Estimation Calculations <br />Austin Road Unit - Forward landfill, Manteca California <br />Contour Interval (ug/L) <br />1-25 <br />25-35.77 <br />Average TVOC Concentration Within Interval (ug/L) <br />13.0 <br />30.39 <br />Aquifer Area Within Interval (ft2) <br />39,744,785 <br />4,400,305 <br />Aquifer Volume Within Interval (ft3) <br />[Aquifer Area (ft2) x Thickness (40 ft)] <br />1,589,791,400 <br />176,012,200 <br />Aquifer Volume Within Interval (L) <br />(28.317 L/ft3) <br />45,018,123,074 <br />4,984,137,467 <br />Groundwater Volume Within Interval (L) <br />[Aquifer Volume (L) x Porosity (0.25)] <br />11,254,530,768 <br />1,246,034,367 <br />TVOC Mass Within Interval (kg) <br />[Average TVOC Concentration (ug/L) x Groundwater <br />Volume (L)/1,000,000,000 ug/kg] <br />146.3 <br />37.9 <br />Plume -Wide TVOC Mass (kg) <br />[Sum of all Interval TVOC Masses] <br />184.2 <br />Threshold Limit (kg) <br />789.5 <br />