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TABLE 12 <br /> ' ESTIMATED INHALATION CANCER RISKS FROM EXPOSURE TO SOIL <br /> US CAN-WELTY ROAD <br /> 35275 Welty Road <br /> ' Vernalis,California <br /> COPC Cs(mg/kg) C811. (mg/m) SFi Inhalation Risk <br /> BTEX <br /> Benzene 0.0050 1.6E-08 1.0E-01 2.4E-10 <br /> Toluene 0.033 7.4E-08 NA NA <br /> ' Eth lbenzene 3.3 4.4E-06 8.7E-03 5.7E-09 <br /> Total Xylenes 9.5 1.1E-05 NA NA <br /> PAHs <br /> Acenaphthene 0.00067 4.7E-10 NA NA <br /> Anthracene 0.11 2.0E-08 NA NA <br /> Benzo(a)anthracene 0.0061 3.1E-10 3.9E-01 1.8E-11 <br /> Benzo(a)pyrene 0.0063 3.2E-10 3.9E+00 1.8E-10 <br /> ' Benzo b fluoranthene 0.013 6.5E-10 3.9E-01 3.8E-11 <br /> Benzo h,i a lene 0.0018 9.0E-11 NA NA <br /> Benzo k fluoranthene 0.00067 3.4E-11 3.9E-01 1.9E-12 <br /> ' Ch Bene 0.44 2.2E-08 3.9E-02 1.3E-10 <br /> Dibenz a,h anthracene 0.00067 3.4E-11 4.1E+00 2.0E-11 <br /> Fluoranthene 0.65 3.3E-08 NA NA <br /> Fluorene 0.61 2.1 E-07 NA NA <br /> ' Indeno 1,2,3-c,d ene 0.00067 3.4E-11 3.9E-01 1.9E-12 <br /> Naphthalene 3.6 7.6E-06 1.2E-01 1.4E-07 <br /> Phenanthrene 2.3 1.2E-07 NA NA <br /> Pyrene 0.067 3.4E-09 NA NA <br /> Total Estimated Risk: 1.4E-07 <br /> Equation: <br /> ' Inhalation Risk=SFi x Ca;,x 0.149 <br /> Where: <br /> Cs=Concentration in soil,mg/kg <br /> SFi=inhalation cancer slope factor,(mg/kg-day)-1 <br /> Ca;,=concentration in air,mg/m3 <br /> Note:Using the PEA Manual,the value for Cai,is estimated using Figures 2.5,2.6,and 2.7 for <br /> VOCs and Figure 2.8 for non-VOCs. <br /> Abbreviations: <br /> ' BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> COPC=Constituent of potential concern <br /> mg/kg=Milligrams per kilogram <br /> ' mg/m'=Milligrams per cubic meter <br /> NA=Not applicable <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> ' PEA=Preliminary Endangerment Assessment <br /> VOCs=Volatile organic compounds <br /> Equation Source: <br /> ' PEA Manual,Figure 2.4. <br /> Page 1 of 1 SAIE <br /> 1 <br />