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Table 7
<br />Fourth Quarter 2024 TVOC Mass Estimations Calculations
<br />2025 Annual Corrective Action Evaluation Report
<br />Forward Landfill
<br />9999 South Austin Road, San Joaquin County, California
<br />Contour Interval (µg/L)1 - 25 25 - 50 50 - 75 75 - 100 100 - 107.0
<br />Average TVOC Concentration Within Interval (µg/L)12.5 37.5 62.5 87.5 103.5
<br />Unadjusted Aquifer Area Within Interval (ft2)37,076,463 1,173,703 255,353 40,905 10,990
<br />Additional Unadjusted Aquifer Area Within Interval (ft2)1,105,079 0 0 0 0
<br />Total Unadjusted Aquifer Area Within Interval (ft2)38,181,542 1,173,703 255,353 40,905 10,990
<br />Excluded Aquifer Area Within Interval (ft2)1,173,703 255,353 40,905 0 0
<br />Additional Excluded Aquifer Area Within Interval (ft2)0 0 0 0 0
<br />Total Excluded Aquifer Area Within Interval (ft2)1,173,703 255,353 40,905 0 0
<br />Total Adjusted Aquifer Area Within Interval (ft2)37,007,839 918,350 214,448 40,905 10,990
<br />Aquifer Volume Within Interval (ft3)
<br />[Aquifer Area (ft2) x Thickness (40 ft)]1,480,313,560 36,734,000 8,577,920 1,636,200 439,600
<br />Aquifer Volume Within Interval (L)
<br />(28.317 L/ft3)41,918,039,079 1,040,196,678 242,900,961 46,332,275 12,448,153
<br />Groundwater Volume Within Interval (L)
<br />[Aquifer Volume (L) x Porosity (0.25)]10,479,509,770 260,049,170 60,725,240 11,583,069 3,112,038
<br />TVOC Mass Within Interval (kg)
<br />[Average TVOC Concentration (µg/L) x Groundwater
<br />Volume (L)/1,000,000,000 µg/kg]
<br />131.0 9.8 3.8 1.0 0.3
<br />Plume-Wide TVOC Mass (kg)
<br />[Sum of all Interval TVOC Masses]
<br />Threshold Limit (kg)
<br />Acronyms and Abbreviations:
<br />µg/kg = microgram per kilogram
<br />µg/L = microgram per liter
<br />ft = feet
<br />ft2 = square feet
<br />ft3 = cubic feet
<br />kg = kilogram
<br />L = liter
<br />L/ft3 = liter per cubic foot
<br />TVOC = total volatile organic compound
<br />145.9
<br />789.5
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