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Table 8
<br />First Quarter 2025 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 - 120.7
<br />Average TVOC Concentration Within Interval (µg/L)12.5 37.5 62.5 87.5 110.4
<br />Unadjusted Aquifer Area Within Interval (ft2)36,436,878 1,121,151 179,455 22,472 13,436
<br />Additional Unadjusted Aquifer Area Within Interval (ft2)780,022 0 0 0 0
<br />Total Unadjusted Aquifer Area Within Interval (ft2)37,216,900 1,121,151 179,455 22,472 13,436
<br />Excluded Aquifer Area Within Interval (ft2)1,121,151 179,455 22,472 0 0
<br />Additional Excluded Aquifer Area Within Interval (ft2)0 0 0 0 0
<br />Total Excluded Aquifer Area Within Interval (ft2)1,121,151 179,455 22,472 0 0
<br />Total Adjusted Aquifer Area Within Interval (ft2)36,095,749 941,696 156,983 22,472 13,436
<br />Aquifer Volume Within Interval (ft3)
<br />[Aquifer Area (ft2) x Thickness (40 ft)]1,443,829,960 37,667,840 6,279,320 898,880 537,440
<br />Aquifer Volume Within Interval (L)
<br />(28.317 L/ft3)40,884,932,977 1,066,640,225 177,811,504 25,453,585 15,218,688
<br />Groundwater Volume Within Interval (L)
<br />[Aquifer Volume (L) x Porosity (0.25)]10,221,233,244 266,660,056 44,452,876 6,363,396 3,804,672
<br />TVOC Mass Within Interval (kg)
<br />[Average TVOC Concentration (µg/L) x Groundwater
<br />Volume (L)/1,000,000,000 µg/kg]
<br />127.8 10.0 2.8 0.6 0.4
<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 />141.5
<br />789.5
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