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TABLE 19 <br /> CALCULATION OF EMISSION RATE FOR VOCs IN SOILS <br /> US CAN-WELTY ROAD <br /> 35275 Welty Road <br /> Vernalis,California <br /> Ci Kd Di He Ei S Csat <br /> COPC Cs(mg/kg) (mg/kg) (cm3/g) (cm2/sec) (atm-m3/mole) He/Kd Kd/Hc (m /sec) (m /L-water) (mg/kg) <br /> BTEX <br /> Benzene 0.0050 5.0E-09 2.9 0.09 5.50E-03 1.9E-03 2.1E-02 1.6E-06 1,790.00 2,581.83 <br /> Toluene 0.033 3.3E-08 4.7 0.078 6.64E-03 1.4E-03 1.8E-02 7.3E-06 526 2,441.14 <br /> Ethylbenzene 3.3 3.3E-06 8.9 0.068 7.88E-03 8.8E-04 1.3E-02 4.3E-04 169 851.09 <br /> Total Xylenes 9.5 9.5E-06 7.7 0.085 5.18E-03 6.8E-04 8.0E-03 1.1E-03 106 988.11 <br /> PAHs <br /> Acenaphthene 0.00067 6.7E-10 100.5 0.051 1.84E-04 1.8E-06 5.5E+05 4.6E-08 3.9 357.38 <br /> Anthracene 0.11 1.1E-07 327 0.039 5.56E-05 1.7E-07 5.9E+06 2.0E-06 0.0434 20.15 <br /> Benzo(a)anthracene 0.0061 6.1E-09 NA NA NA NA NA NA NA NA <br /> Benzo(a)pyrene 0.0063 6.3E-09 NA NA NA NA NA NA NA NA <br /> Benzo b fluoranthene 0.013 1.3E-08 NA NA NA NA NA NA NA NA <br /> Benzo ,h,i a lene 0.0018 1.8E-09 NA NA NA NA NA NA NA NA <br /> Benzo(k)fluoranthene 0.00067 6.7E-10 NA NA NA NA NA NA NA NA <br /> Chrysene 0.44 4.4E-07 NA NA NA NA NA NA NA NA <br /> Dibenz a,h anthracene 0.00067 6.7E-10 NA NA NA NA NA NA NA NA <br /> Fluoranthene 0.65 6.5E-07 NA NA NA NA NA NA NA NA <br /> Fluorene 0.6 6.1E-07 183.2 0.044 9.62E-05 5.3E-07 1.9E+06 2.1E-05 1.69 300.39 <br /> Indeno 1,2,3-c,d ene 0.00067 6.7E-10 NA NA NA NA NA NA NA NA <br /> Naphthalene 3.6 3.6E-06 30.9 0.060 4.40E-04 1.4E-05 7.0E+04 7.5E-04 31 819.88 <br /> Phenanthrene 2.3 2.3E-06 NA NA NA NA NA NA NA NA <br /> Pyrene 0.067 6.7E-08 NA NA NA NA NA NA NA NA <br /> Equation: <br /> _8X 105 X Dix He X C, <br /> d <br /> �i <br /> 0.02,3 <br /> 0.284 + 0.040 K d <br /> H, <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 /> Abbreviations: Equation Source: <br /> atm-m3/mole=Atmosphere per cubic meter per mole Ei-PEA Manual,Figure 2.6. <br /> cm2/sec=Square centimeter per second Csat-PEA Manual Equation 2.5(as modified per Item 3 of the Errata Sheet) <br /> cm3/g=Cubic centimeter per gram Parameter values from Regional Screening Level(RSL)Chemical-specific Parameters Supporting Table,May 2010 <br /> COPC=Constituent of potential concern <br /> Cs=Concentration in soil,mg/kg <br /> mg/kg=Milligram per kilogram <br /> mg/sec=Milligram per second <br /> NA=Not applicable because chemical is considered non-volatile(PEA Manual) <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> PEA=Preliminary Endangerment Assessment <br /> VOCs=Volatile organic compounds <br /> Page 1 of 1 SAIC <br />