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Table 6
<br />Third Quarter 2022 Total VOC Mass Estimate Calculations
<br />Austin Road Unit
<br />Forward Landfill, Manteca, California
<br />Contour Interval (ug/L)1 - 25 25 - 50 50 - 75 75-75.6
<br />Average TVOC Concentration Within Interval (ug/L)12.5 37.5 62.5 75.3
<br />Unadjusted Aquifer Area Within Interval (ft2)31,013,070 5,991,197 1,897,116 165,210
<br />Additional Unadjusted Aquifer Area Within Interval (ft2)160,194 0 0 0
<br />Total Unadjusted Aquifer Area Within Interval (ft2)31,173,264 5,991,197 1,897,116 165,210
<br />Excluded Aquifer Area Within Interval (ft2)5,991,197 1,897,116 165,210 0
<br />Additional Excluded Aquifer Area Within Interval (ft2)0 0 0 0
<br />Total Excluded Aquifer Area Within Interval (ft2)5,991,197 1,897,116 165,210 0
<br />Total Adjusted Aquifer Area Within Interval (ft2)25,182,067 4,094,081 1,731,906 165,210
<br />Aquifer Volume Within Interval (ft3)
<br />[Aquifer Area (ft2) x Thickness (40 ft)]1,007,282,680 163,763,240 69,276,240 6,608,400
<br />Aquifer Volume Within Interval (L)
<br />(28.317 L/ft3)28,523,223,650 4,637,283,667 1,961,695,288 187,130,063
<br />Groundwater Volume Within Interval (L)
<br />[Aquifer Volume (L) x Porosity (0.25)]7,130,805,912 1,159,320,917 490,423,822 46,782,516
<br />TVOC Mass Within Interval (kg)
<br />[Average TVOC Concentration (ug/L) x Groundwater Volume
<br />(L)/1,000,000,000 ug/kg]
<br />89.1 43.5 30.7 3.5
<br />Plume-Wide TVOC Mass (kg)
<br />[Sum of all Interval TVOC Masses]
<br />Threshold Limit (kg)
<br />166.8
<br />789.5
<br />Annual Cap Tables_2023_0801 18/25
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