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Table 8
<br /> First Quarter 2017 Total VOC Mass Estimation Calculations
<br /> Austin Road Unit-Forward Landfill, Manteca California
<br /> Contour Interval (ug/L) 1-25 25-50 50-75 75-100 100-113.5
<br /> Average TVOC Concentration Within Interval (ug/L) 13.0 37.5 62.5 87.5 106.75
<br /> Aquifer Area Within Interval(ft2) 36,056,890 18,426,535 9,267,050 3,495,420 575,055
<br /> Aquifer Volume Within Interval(ft3)
<br /> [Aquifer Area (ft2)x Thickness(40 ft)] 1,442,275,600 737,061,400 370,682,000 139,816,800 23,002,200
<br /> Aquifer Volume Within Interval (L)
<br /> (28.317 L/ft3) 40,840,918,165 20,871,367,664 10,496,602,194 3,959,192,326 651,353,297
<br /> Groundwater Volume Within Interval(L)
<br /> [Aquifer Volume(L)x Porosity(0.25)] 10,210,229,541 5,217,841,916 2,624,150,549 989,798,081 162,838,324
<br /> TVOC Mass Within Interval (kg)
<br /> [Average TVOC Concentration (ug/L)x Groundwater
<br /> Volume(L)/1,000,000,000 ug/kg] 132.7 195.7 164.0 86.6 17.4
<br /> Plume-Wide TVOC Mass(kg)
<br /> [Sum of all Interval TVOC Masses] 596.4
<br /> Threshold Limit(kg) 789.5
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