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TABLE 18 <br /> CALCULATION OF EMISSION RATE FOR VOCs IN SOILS <br /> FORMER VERNALIS PUMP STATION <br /> Vernalis,San Joaquin and Stanislaus Counties,California <br /> Cs Ci Kd Di He Ei S Csat <br /> COPC (mg/kg (m /k (cm3/ ) (cm2/sec) (atm-m3/mole) Hc/Kd Kd/Hc (m /sec) ((mg/L-water (mg/kg) <br /> BTEX <br /> Toluene 0.03500 3.5E-08 4.4 0.075 8.44E-03 1.9E-03 5.2E+02 9.6E-05 534.8 2441 <br /> Ethylbenzene 0.00500 5.0E-09 5.1 0.078 5.94E-03 1.2E-03 8.7E+02 1.1E-05 161 851 <br /> Xylene(s) 0.42000 4.2E-07 4.8 0.087 5.30E-03 1.1E-03 9.1E+02 9.3E-04 200 988 <br /> PAHs <br /> Acenaphthene 0.00500 5.0E-09 92.0 0.064 1.20E-03 1.3E-05 7.7E+04 1.0E-06 3.88 357 <br /> Benzo(a)anthracene 0.05700 5.7E-08 NA NA NA NA NA NA NA NA <br /> Benzo(a)pyrene 0.00810 8.1E-09 NA NA NA NA NA NA NA NA <br /> Benzo(b)fluoranthene 0.00830 8.3E-09 NA NA NA NA NA NA NA NA <br /> Benzo(g,h,i)perylene 0.01100 1.1E-08 NA NA NA NA NA NA NA NA <br /> Benzo(k)fluoranthene 0.00500 5.0E-09 NA NA NA NA NA NA NA NA <br /> Chrysene 0.08600 8.6E-08 NA NA NA NA NA NA NA NA <br /> Dibenz(a,h)anthracene 0.00500 5.0E-09 NA NA NA NA NA NA NA NA <br /> Fluoranthene 0.03600 3.6E-08 NA NA NA NA NA NA NA NA <br /> Fluorene 0.00500 5.0E-09 158.0 0.061 6.42E-05 4.1E-07 2.5E+06 1.8E-07 1.9 300 <br /> Indeno(1,2,3-cd)pyrene 0.00800 8.0E-09 NA NA NA NA NA NA NA NA <br /> Naphthalene 1.10000 1.1E-06 25.8 0.069 5.00E-04 1.9E-05 5.2E+04 2.9E-04 31.7 820 <br /> Phenanthrene 0.76000 7.6E-07 NA NA NA NA NA NA NA NA <br /> Pyrene 0.05900 5.9E-08 NA NA NA NA NA NA NA NA <br /> Equation: <br /> 1.6 X 105XD1 % HcXCi <br /> El_ Kd <br /> 0.023 <br /> Dix <br /> 0.284 + 0.046 x K e <br /> W, <br /> Where: <br /> Ei=average emission rate of contaminant i over the residential lot during the exposure interval,mg/sec <br /> Ci=bulk soil concentration of contaminant i;(chemical concentration in soil,mg/kg,x[10-6 kg/mg]) <br /> Di=diffusivity in air for compound i,cm2/sec <br /> He=Henry's Law constant,atm-m3/mole <br /> Kd=soil/water partition coefficient,cm3/g <br /> -- The Benham Campanies,LLC <br /> 46. n wi,,,iaowee <br /> Page 1 of 2 pm Samnae fa Snl,+t,aas <br />