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MTBE MASS IN GROUNDWATER CALCULATIONS October 2003 Total Estimated Mass of MTBE In Groundwater: 3.89 lbs Volume of impacted groundwater inside 10,000 gg/L contour Area in square feet 288 W Avgerage thickness(from A-A' Section,estimated at same thickness as 1,000 gg/L contour) 8.44 ft ' Volume in cubic feet 2,431 ft' Volume of water in pore spaces(40%porosity) 972 ft' Volume of water in pore spaces(liters) 27,535 L ' Concentration of MTBE in groundwater Sample from CPT-4 12,000 ug/L Calculated mass of MTBE in pg 330,422,354 ug Calculated mass of MTBE in mg 330,422 mg Calculated mass of MTBE in kg 0.33 kg Calculated mass of MTBE in pounds 0.73 lbs ' Volume of impacted groundwater between 1,000 gg/L and 10,000 gg/L contour Area in square feet 1,112 W Avgerage thickness(from A-A'Section) 8.44 R ' Volume in cubic feet 9,385 ft' Volume of water in pore spaces(40%porosity) 3,754 ft' Volume of water in pore spaces(liters) 106,316 L Concentration of MTBE in groundwater Average of 10,000 ug/L+ 1,000 ug/L 5,500 µg/L Calculated mass of MTBE in ug 584,740,485 ug ' Calculated mass of MTBE in mg 584,740 mg Calculated mass of MTBE in kg 0.58 kg Calculated mass of MTBE in pounds 1.29 lbs Volume of impacted groundwater between 1,000 gg/L and 100 gg/L contour Area in square feet 11,675 ft' Avgerage thickness(from A-A'Section) 10.80 ft Volume in cubic feet 126,090 ft' Volume of water in pore spaces(40%porosity) 50,436 ft' Volume of water in pore spaces(liters) 1,428,348 L Concentration of MTBE in groundwater Average of 1,000 ug/l,+ 100 µg/L 550 pg/L Calculated mass of MTBE in mg 785,591,136 pg ' Calculated mass of MTBE in mg 785,591 mg Calculated mass of MTBE in kg 0.79 kg Calculated mass of MTBE in pounds 1.73 lbs 1 i PA3000_prj 3761 Boyett Manteca13761C Boyett Manteca Groundwater MonitoHng%ReportslNFARIMass Calcs.xls