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gTABLE,D=1"� Page 1 of 1 <br /> ESTIMATED MTBE MASS IN GROUNDWATER(NOVEMBER 4,2011) <br /> INDEPENDENT SHELL-BRANDED SERVICE STATION <br /> 4315 WATERLOO ROAD <br /> STOCKTON,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) (pg/1) (lb) (gallons) <br /> 15.00 214 3,210 0.4 9,604 5.55 0.00 0.00 ) <br /> 15.00 1,238 18,570 044 55,561 27.50 0.01 0.00 <br /> 15.00 2,550 38,250 0.4 114,444 55.75 0.05 0.01 <br /> 15.00 976 14,640 0.4 43,803 27.50 0.01 0.00 <br /> 15.00 368 5,520 0.4 16,516 110.00 0.02 0.00 <br /> Total Estimated Residual MTBE: 0.09 0.01 <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)/6.17(lbs/gal) <br /> Approximate density of MTBE=6.17 lb/gal <br /> i <br /> Abbreviations: Soil Type: Porosi <br /> MTBE=methyl tertiary butyl ether Gravel 25-40 <br /> GW=Groundwater Sand 25-50 <br /> ft=feet Silt 35-50 <br /> sq-ft=square feet Clay 40-70 <br /> cu-ft=cubic feet <br /> kg=kilograms <br /> lb=pound <br /> µg/1=micrograms per liter <br /> lb/gal=pounds per gallon From:Groundwater;Freeze&Cherry,1979,Prentice-Hall,Inc.,pg.37. (based on Davis,1969) <br /> CRA 241359(7) <br /> 1e <br /> 1 <br />