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CAMBRIA <br /> Table 2 Estimated Benzene Mass Remaining in Groundwater-Shell-branded Service Station,620 West Charter Way Stockton California <br /> Contoured Impacted GW Impacted GW Aquifer Volum" Estimated Impacted Representative Total Dissolved Total Dissolved <br /> Interval Thickness Area Aquifer GW Volume Concentration Mass I Volume <br /> ft (sq-ft) cu ft Parost (gallons) u lb (gallons) <br /> 30 40 it interval <br /> €0 contour 10 4,945 44 450 04 147 954 125 002 000 <br /> I contour 10 2 993 29 930 04 89 551 5 0 00 000 <br /> 40 50 ft interval <br /> 10 000 contour t 0 3 154 31 540 04 94 368 6 600 5 20 071 <br /> 1 000 contour 10 4 936 49 360 04 147 685 5 000 6 1 6 084 <br /> t 00 contour 10 7 562 75 620 04 226 255 500 094 0 13 <br /> 10 contour 10 2,983 29 830 04 89,251 50 004 001 <br /> I contour 10 3 149 31 490 04 94 218 5 000 000 <br /> 50 70 ft interval <br /> 1000 contour 20 8 497 169 940 04 508 460 1600 679 093 <br /> 100 contour 20 8 518 170,360 04 509 717 500 2 13 0 29 <br /> 10 contour 20 3 485 69 700 04 208 542 50 009 001 <br /> I contour 20 4 321 86 420 04 258 569 5 001 000 <br /> 7D 80 ft interval <br /> 1000 contour 10 1 093 10 930 0 4 32 703 1 470 040 005 <br /> 100 contour 10 7 526 75 260 0 4 225 178 500 0 94 0 13 <br /> 10 contour 10 4,037 40 370 0 4 120 787 50 0 05 001 <br /> I contour to 6 458 64,580 0 4 t93,223 5 001 000 <br /> >80 ft interval <br /> 10 contour 15 434 6 510 0 3 14 608 18 Goo 000 <br /> I contour 15 9 449 141 735 0 3 319 053 5 0 01 000 <br /> Total Estimated Residual Benzene 2279 3 11 <br /> motes <br /> Aquifer Volume=Impacted aquifer thickness x impacted aquifer area[excludes aquifer volumeo`f greater impact] <br /> Impacted GW Volume=Aquifer volume(cu ft)x est porosity(%)x 7 48(gals/cu-ft) 1f <br /> Total Dissolved Benzene Mass=GW volume(gals)x 3 785(€lgal)x Concentration(ug/1)x 2 205(b/kg I 1 000,000 000(ug/kg) <br /> Total Dissolved Benzene Volume=Mass(]b)!7 34(lbs/gal) <br /> Approximate density Benzene—7 34 Ib/gal <br /> Abbreviations Porosity f <br /> GW=Groundwater Soil Type i%) <br /> Jt=feet Gravel 25 40 <br /> sq ft=square feet Sand 25 50 <br /> cu It=cubic feet Sdt 35 50 <br /> Ib=pound Clay 40 70 <br /> ugll=micrograms per liter <br /> From Groundwater Freeze&Cherry 1979 Prent;ce Hall Inc pg 37 (based on Davis 1969) <br /> 0 LSwckw rttr WayaMRTSISCM 10-04 W pp H Ht grass E=xit s ab 1 I W INHA <br />