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TABLE 4 Page 3 of 3 <br /> ESTIMATED MASS REMAINING IN SOIL <br /> FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINES <br /> NEIGHBORHOODS B,C,AND D <br /> MOUNTAIN HOUSE,CALIFORNIA <br /> Soil Interval Impacted Soil Impacted Soil Soil Volume Representative Estimated Soil Total Impacted Total Residual Total Residual <br /> (feet below Thickness Area Concentration Bulk Density Soil Mass Contaminant Mass in Soil Contaminant Volume in Soil <br /> surface) (ft) (sq-ft) (cu ft) (mg/kg) (lb/cu-ft) (lb) (lb) (gallons) <br /> 15-25' 10.0 243 2,430 1125 79.9 194,157 218.4 35.8 <br /> 15-25' 10.0 326 3,260 112.5 79.9 260,474 29.3 4.8 <br /> 15-25' 10.0 299 2,990 295 79.9 238,901 70.5 11.6 <br /> 15-25' 10.0 363 3,630 112.5 79.9 290,037 32.6 5.3 <br /> 15-25' 10.0 257 2,570 370 79.9 205,343 76.0 12.5 <br /> 15-25' 10.0 448 4,480 112.5 79.9 357,952 40.3 6.6 <br /> 15-25' 10.0 267 2,670 55 79.9 213,333 11.7 1.9 <br /> Total Estimated Residual TPHc: 15,468 2,536 <br /> Notes: <br /> Soil Volume=Impacted soil thickness x impacted soil area[excludes soil volume of greater impact] <br /> Residual Mass=Impacted soil mass(lb)x Concentration(mg/kg)/1,000,000 (mg/kg) <br /> Derived from:Hydrology for Engineers;Linsley,Kohler&Paulhus,1982,McGraw-Hill,Inc.pg.179. <br /> Total Impacted Soil Mass=Soil Volume(cu-ft)x Bulk Density(Ib/cu-ft) <br /> Chemical Mass to Chemical Volume=Mass Chemical(lbs)/ 6.1 (Ib/gal) <br /> Impacted Soil Area measured from isoconcentration maps for dispenser samples. Radius of 10 feet assumed for monitoring well soil concentrations. <br /> Bulk(Drv) <br /> Abbreviations: Soil Type: Density(Ib/cu ft): <br /> ft=feet Sand 94.8 <br /> cu-ft=cubic feet Sandy loam 89.9 <br /> kg=kilograms Loam 84.9 <br /> mg/kg=milligrams per kilogram Silt loam 79.9 <br /> sq-ft=square feet Clay loam 79.9 <br /> Clay 74.9 <br /> Peat 25.0 <br /> CRA 060222(11) <br />