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r r� r r r r rr r r rr r r rr r� r r r rr rr <br /> TABLE 22 <br /> CALCULATION OF EMISSION RATE FOR VOCS IN SOILS <br /> SURLAND HOMES-BRIDLE CREEK <br /> Tracy,California <br /> Ci Kd Di <br /> Ei <br /> He <br /> Constituent in Soil T-C,(m } (m ) (cm3/ } (cmzlse <br /> BTEx c) (atm-m3/mole) Hc/Kd Kd/Hc ( sec) <br /> Toluene 0.028 2.8E-08 4.4 0.075 8.44E-03 1.9E-03 5.2E+02 7.6E-05 <br /> Eth (benzene I.5 1.5E-06 5.1 0.078 5.94E-03 1.2E-03 8.7E+02 3.2E-03 <br /> X lene s 1.5 1.5E-06 4.8 0.087 5.30E-03 1.1 E-03 9.1 E+02 3.3E-03 <br /> PAHs <br /> Acenaphthene 0.17 1.7E-07 92.0 0.064 1.20E-03 1.3E-05 7.7E+04 3.5E-05 <br /> Anthracene 0.090 9.0E-08 252 0.058 3.40E-05 1.4E-07 7.4E+06 1.8E-06 <br /> Benzo a anthracene 0.032 3.2E 08 NA NA NA NA NA NA <br /> Benzo(a)pyrene 0.0046 4.6E-09 NA NA NA NA NA NA <br /> Benzo 6 fluoranthene 0.024 2.4E-08 NA NA NA NA NA NA <br /> Benzo(g,h,i) a lene 0.040 4.0E-08 NA NA NA NA NA NA <br /> Ch Bene 0.081 8.1E-08 NA NA NA NA NA NA <br /> Dibenz(a,h)anthracene 0.0068 6.8E-09 NA NA NA NA NA NA <br /> Fluoranthene 0.027 2.7E-08 NA NA NA NA NA NA <br /> Fluorene 0.48 4.8E-07 158 0.061 6.42E-05 4.1E-07 2.5E+06 1.7E-05 <br /> Naphthalene 0.36 3.6E-07 25.8 0.Ofi9 5.00E-04 1.9E-05 5.2E+04 9.5E-05 <br /> Phenanthrene 1.8 1.8E-06 NA NA NA NA NA NA <br /> Pyrene 0.074 7.4E-08 NA NA NA NA NA NA <br /> Equation: <br /> 7..6 X 10 1 x D, X H L X C, <br /> E. - KY <br /> 0.023 <br /> Ds X <br /> 0.284 + 0.046 X K' <br /> He <br /> e <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: Note: <br /> atm-m'/mole=Atmospheres per cubic meter per mole Metals were not included on this table because they are not volatile. <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> cm2/sec=Square centimeters per second Equation Source: <br /> em°/g=Cubic centimeters per gram PEA Manual.Figure 2.6. <br /> mg/kg=Milligrams per kilogram <br /> mg/see=Milligrams per second <br /> NA=Not Applicable because chemical is considered non-volatile <br /> (PEA Manual) <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> PEA=Preliminary Endangerment Assessment <br /> VOCs-Volatile organic compounds _ __ <br /> CAI w.- <br /> Page 1 of 1 From science lo5aluno., <br />