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�i <br /> CAMBRIA <br /> Table 3 Estimated MTBE Mass Remaining in Groundwater-Shell-branded Service Station,620 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) (ug/1) Ib (gallons) <br /> 30 40 ft Interval <br /> 10 000 contour 10 86 860 04 2 573 5 500 0 12 002 <br /> 1 000 contour 10 709 7 090 04 21 213 5 000 089 0 14 <br /> 100 contour 10 1 422 14,220 04 42 546 500 0 18 0 03 <br /> 10 contour 10 2 910 29 100 04 87 067 50 004 001 <br /> I contour l0 3051 30 510 04 91 286 5 000 000 <br /> 40-50 ft interval <br /> 100 contour 10 818 8 180 04 24 475 421 009 001 <br /> 10 contour 10 8 959 89 590 04 268 053 50 0 11 002 <br /> 1 contour 10 22,816 228,160 04 682,655 5 003 0 00 <br /> 50-70 ft interval <br /> 10 contour 20 7 796 155 920 04 466 513 18 007 001 <br /> I contour 20 21,374 427 480 04 1279,020 5 005 001 <br /> 70-80 ft interval <br /> I contour 10 21 692 216 920 04 649 025 3 85 002 000 <br /> >80 ft interval <br /> No Contours <br /> Total Estimated Residual XITBE 1 59 026 <br /> 'Votes <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(galslcti-ft) <br /> Total Dissolved MTBE Mass=GW volume(gals)x 3 785(l/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 MTBE=6 17 lb/gal <br /> Abbreviations Porosit) <br /> GW=Groundwater Sod Tr oe n <br /> ft=feet Gravel 25 40 <br /> sq-ft=square feet Sand 25 50 <br /> cu-ft=cubic feet Silt 35 50 <br /> Ib=pound Clay 4070 <br />` ug/I m micrograms per liter <br /> From Groundwater Freeze&Cherry 1979 Prentice-Hall Inc pg 37 (based on Davis '969) <br /> 0 IStodnon 620 W Cha r WayREPORMCM 10 04Wpp B Hc Mus Esumates As Page I of I I 5 <br />