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Table 9 <br />Second Quarter 2016 Total VOC Mass Estimation Calculations <br />Austin Road Unit - Forward Landfill, Manteca California <br />Contour Interval (ug/L) <br />1-25 <br />25-50 <br />50-71.8 <br />Average TVOC Concentration Within Interval (ug/L) <br />13.0 <br />37.5 <br />60.9 <br />Aquifer Area Within Interval (ft2) <br />38,065,850 <br />14,047,095 <br />2,871,720 <br />Aquifer Volume Within Interval (ft3) <br />[Aquifer Area (ft2) x Thickness (40 ft)] <br />1,522,634,000 <br />561,883,800 <br />114,868,800 <br />Aquifer Volume Within Interval (L) <br />(28.317 L/ft3) <br />43,116,426,978 <br />15,910,863,565 <br />3,252,739,810 <br />Groundwater Volume Within Interval (L) <br />[Aquifer Volume (L) x Porosity (0.25)] <br />10,779,106,745 <br />3,977,715,891 <br />813,184,952 <br />TVOC Mass Within Interval (kg) <br />[Average TVOC Concentration (ug/L) x Groundwater <br />Volume (L)/1,000,000,000 ug/kg] <br />140.1 <br />149.2 <br />1 49.5 <br />Plume -Wide TVOC Mass (kg) <br />[Sum of all Interval TVOC Masses] <br />338.8 <br />Threshold Limit (kg) <br />789.5 <br />