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CAMBRIA <br /> Table G Estimated MTBE Mass Remaining in Groundwater -Chevron Station 9-1848 - 1257 W Yosemite Avenue,Manteca, California <br /> Impacted GW Impacted GW Aquifer Volume Estimated Impacted Representative MTBE Total Dissolved Total Dissolved <br /> Thickness Area Aquifer GW Volume Concentration MTBE Mass MTBE Volume <br /> (ft) (sq-ft) (cu-ft) Porosity (gallons) (ug/1 or ppb) (lb) (gallons) <br /> 200 19,200 202,000 03 453,288 4 002 0 002 <br /> 100 18,200 182,000 03 408,408 45 0 15 0 024 <br /> Total Estimated Residual MTBE 017 0 027 <br /> Notes: <br /> Aquifer Volume=Impacted aquifer thickness x impacted aquifer area [excludes aquifer volume of greater impact] <br /> Impacted GW Volume=Aquifer volume (cu-ft) x est porosity(%) x 7 48 (gals/cu-ft) <br /> Total Dissolved MTBE Mass=GW volume (gals) x 3 785 (1/gal) x Concentration (ug/1) x 2 205 lb/kg/ 1,000,000,000 (ug/kg) <br /> Total Dissolved MTBE Volume=Mass (lb)/ 6 31 (lbs/gal) <br /> Approximate density MTBE (gasoline) =b 31 lb/gal <br /> Abbreviations <br /> GW=Groundwater <br /> ft=feet <br /> sq-ft=square feet Soil Type_ PorositV <br /> cu-ft=cubic feet Gravel 25-40 <br /> gals=gallons Sand 25-50 <br /> kg=kilograms Silt 35-50 <br /> lb=pound Clay 40-70 <br /> ug/l=micrograms per liter <br /> ppb=parts per billion From Groundwater, Freeze&Cherry, 1979,Prentice-Hall Inc,pg 37 (based on Davis, 1969) <br /> R 59 1848 MantecakClosure%Copy of Mass Estimating Spreadsheet 11 03 Page 1 of 1 3/23/2006 <br />