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Third Quarter 2014 Total Volatile Organic Compound Mass Estimation Calculations <br />Austin Road Unit - Forward Landfill - Manteca, California <br />Contour Interval (ug/L) <br />1-25 <br />25-50 <br />50-75 <br />75-76.4 <br />Average TVOC Concentration Within Interval (ug/L) <br />13.00 <br />37.50 <br />62.50 <br />75.70 <br />Aquifer Area Within Interval (ft) <br />4,366,259 <br />583,256 <br />121,797 <br />46,619 <br />Aquifer Volume Within Interval (ft) <br />[Aquifer Area (ft) x Thickness (40 ft)] <br />174,650,360 <br />23,330,240 <br />4,871,880 <br />1,864,760 <br />Aquifer Volume Within Interval (L) <br />a <br />[28.317 L/ft] <br />4,945,574,244 <br />660,642,406 <br />137,957,026 <br />52,804,409 <br />Groundwater Volume Within Interval (L) <br />[Aquifer Volume (L) x Porosity (0.25)J <br />1,236,393,561 <br />165,160,602 <br />34,489,256 <br />13,201,102 <br />TVOC Mass Within Interval (kg) <br />[Average TVOC Concentration (ug/L) x Groundwater <br />16.07 <br />6.19 <br />2.16 <br />1.00 <br />Volume (L) / 1,000,000,000 ug/kg] <br />Plume -Wide TVOC Mass (kg) <br />[Sum of All Interval TVOC Masses] <br />25.42 <br />Threshold Limit (kg) <br />789.5 <br />Notes: <br />Aquifer areas dervived from Figure 1. <br />0 0 0 <br />