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CAMBRIA <br /> Table Al Estimated TPHg Mass Rematmng to Groundwater-Former Texaco Service Station/ARCO,440 West Charter Way,Stockton,California <br /> Contoured Impacted GW Impacted GW Aquifer Volume Estimated Impacted Representative Total Dissolved Total Dissolved <br /> Interval Thickness Area Aquifer GW Volume Concentration Mass Volume <br /> (ft) (sq-ft) (cu-ft) Porosity (gallons) (ug2) Ob) (gallons) <br /> Shallow Groundwater <br /> 1,000 contour 20 24,737 494,740 04 1,480,262 2,750 3397 5 53 <br /> 100 contour 20 19,906 398,120 04 1,191,175 500 497 081 <br /> Total Estimated Residual TPHg 3894 634 <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 TPHg Mass=GW volume(gals)x 3 785 ftal)x Concentration(ug/1)x 2 205 lb/kg/1,000,000,000(ug/kg) <br /> Total Dissolved TPHg Volume=Mass(lb)/6 14(lbs/gal) <br /> Approximate density TPHg(gasoline)=6 14 lb/gal <br /> Abbreviations Porosity <br /> GW=Groundwater Soil Type n(%) <br /> ft=feet Gravel 25.40 <br /> sq-ft=square feet Sand 25 50 <br /> cu-ft=cubic feet Silt 35-50 <br /> lb=pound Clay 40-70 <br /> ug/l=micrograms per liter <br /> From Groundwater,Freeze&Cherry, 1979,Prentice-Hall,Inc,pg 37 (based on Davis,1969) <br /> 1399 Page I of 1 i tlY2004 <br />