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TABLE 9 <br /> ESTIMATED INHALATION CANCER RISKS <br /> MOUNTAIN HOUSE DEVELOPMENT SITE#6 <br /> Mountain House,San Joaquin County,California <br /> 8:59 AM <br /> COPC in Soil Cs(mg/kg) Cain (mg/rn) SFi Inhalation Risk <br /> BTEX <br /> Benzene 0.00050 1.5E-08 1.0E-01 2.2E-10 <br /> Ethylbenzene 0.055 9.8E-07 8.7E-03 1.3E-09 <br /> Xylene(s) 0.0010 1.7E-08 NA NA <br /> PAHs <br /> Acenaphthene 0.47 3.3E-07 NA NA <br /> Acenaphthylene 0.19 9.5E-09 NA NA <br /> Anthracene 0.17 3.2E-08 NA NA <br /> Benza(a)anthracene 0.21 1.1E-08 3.9E-01 6.1E-10 <br /> Benzo(a)pyrene 0.041 2.1E-09 3.9E+00 1.2E-09 <br /> Benzo(b)fluoranthene 0.052 2.6E-09 3.9E-01 NA <br /> Benzo(g,h,i)perylene 0.033 1.7E-09 NA NA <br /> Benzo(k)fluoranthene 0.047 2.4E-09 3.9E-01 1.4E-10 <br /> Chrysene 0.68 3.4E-08 3.9E-02 2.0E-10 <br /> Dibenz(a,h)anthracene 0.034 1.7E-09 4.1E+00 1.0E-09 <br /> Fluoranthene 0.079 4.0E-09 NA NA <br /> Fluorene 0.66 2.3E-07 NA NA <br /> Indeno(1,2,3-cd)pyrene 0.016 8.0E-10 3.9E-01 4.6E-11 <br /> Naphthalene 0.33 7.0E-07 1.2E-01 1.2E-08 <br /> Phenanthrene 4.0 2.0E-07 NA NA <br /> Pyrene 0.27 1.4E-08 NA NA <br /> Total Risk: 1.7E-08 <br /> Equation: <br /> Inhalation Risk=SFi x Cair x 0.149 <br /> Where: <br /> Cs=concentration in soil,mg/kg <br /> SFi=inhalation cancer slope factor,(mg/kg-dayyl <br /> Cair=concentration in air,mg/m, <br /> Note:Using the PEA Manual,the value for Cair 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 /> Cal/EPA=California Environmental Protection Agency <br /> COPC=Constituent of potential concern <br /> DTSC=Department of Toxic Substances Control <br /> mg/kg=Milligrams per kilogram <br /> mg/m3=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. (Cal/EPA DTSC,June 1999). <br /> From Smenca to 5alulmns <br /> Page 1 of 1 <br />