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Table 9
<br />Second Quarter 2023 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 - 77.2
<br />Average TVOC Concentration Within Interval (ug/L)12.5 37.5 62.5 76.1
<br />Unadjusted Aquifer Area Within Interval (ft2)34,577,098 365,752 263,002 103,900
<br />Additional Unadjusted Aquifer Area Within Interval (ft2)119,841 0 0 0
<br />Total Unadjusted Aquifer Area Within Interval (ft2)34,696,939 365,752 263,002 103,900
<br />Excluded Aquifer Area Within Interval (ft2)365,752 263,002 103,900 0
<br />Additional Excluded Aquifer Area Within Interval (ft2)0 0 0 0
<br />Total Excluded Aquifer Area Within Interval (ft2)365,752 263,002 103,900 0
<br />Total Adjusted Aquifer Area Within Interval (ft2)34,331,187 102,750 159,102 103,900
<br />Aquifer Volume Within Interval (ft3)
<br />[Aquifer Area (ft2) x Thickness (40 ft)]1,373,247,480 4,110,000 6,364,080 4,156,000
<br />Aquifer Volume Within Interval (L)
<br />(28.317 L/ft3)38,886,248,891 116,382,870 180,211,653 117,685,452
<br />Groundwater Volume Within Interval (L)
<br />[Aquifer Volume (L) x Porosity (0.25)]9,721,562,223 29,095,718 45,052,913 29,421,363
<br />TVOC Mass Within Interval (kg)
<br />[Average TVOC Concentration (ug/L) x Groundwater Volume
<br />(L)/1,000,000,000 ug/kg]
<br />121.5 1.1 2.8 2.2
<br />Plume-Wide TVOC Mass (kg)
<br />[Sum of all Interval TVOC Masses]
<br />Threshold Limit (kg)
<br />127.7
<br />789.5
<br />Annual Cap Tables_2023_0801 21/25
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