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TABLE 21 <br /> 1 INHALATION CANCER RISK: CONSTRUCTION WORKER SCENARIO <br /> SURLAND HOMES-BRIDLE CREEK <br /> Tracy,San Joaquin County,California <br /> COPC Cs(mg/kg) C,;, (mg/m3) SFi Inhalation Risk <br /> BTEX <br /> ' Toluene 0.0030 8.3E-08 NA NA <br /> Eth lbenzene 0.0030 1 6.5E-08 I 8.7E-03 I 1.6E-12 <br /> X lene s 0.0030 6.7E-08 NA NA <br /> PAHs <br /> ' Acenaphthene 0.18 3.8E-07 NA NA <br /> Anthracene 0.14 2.8E-08 NA NA <br /> Benzo(a)anthracene 0.058 2.9E-09 3.9E-01 3.2E-12 <br /> ' Benzo a ene 0.0063 3.2E-10 3.9E+00 3.4E-12 <br /> Benzo fluoranthene 0.054 2.7E-09 3.9E-01 2.9E-12 <br /> Benzo h i e lene 0.058 2.9E-09 NA NA <br /> Benzo k fluoranthene 0.0067 3.4E-10 3.9E-01 3.7E-13 <br /> ' <br /> Chrysene 0.063 3.2E-09 3.9E-02 3.4E-13 <br /> Dibenz a h anthracene 0.0073 3.7E-10 4.1E+00 4.2E-12 <br /> Fluoranthene 0.039 2.0E-09 NA NA <br /> Fluorene 0.57 2.1E-07 NA NA <br /> Naphthalene 1.1 2.9E-06 1.2E-01 9.8E-10 <br /> Phenanthrene 0.60 3.0E-08 NA NA <br /> Pyrene 0.099 5.0E-09 NA NA <br /> ' METALS <br /> Barium 211 1.1E-05 NA NA <br /> Beryllium 0.82 4.1E-08 8.4E+00 9.6E-10 <br /> Chromium III 44 2.2E-06 NA NA <br /> ' Cobalt 12 6.0E-07 NA NA <br /> Copper 103 5.2E-06 NA NA <br /> Lead 16 8.0E-07 4.2E-02 9.4E-11 <br /> ' <br /> Mercury 0.014 7.0E-I0 NA NA <br /> MolybdenumNA <br /> NA <br /> Nickel 39 2.0E-06 9.TE-50 5.0E-09 <br /> Vanadium 76 3.8E-06 NA NA <br /> 1 Zinc 85 4.3E-06 NA NA <br /> Total Risk: 7.0E-09 <br /> 1 Equation: <br /> Inhalation Risk=SFi x C,;,x 0.0028 <br /> Where: <br /> ' SFi=inhalation cancer slope factor,(mg/kg-day)-' <br /> C,;,=concentration in air,mg/m3 <br /> (Note:Using the PEA Manual,the value for C,;,is estimated using Figures 2.5,2.6&2.7 for <br /> 1 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 /> mgfkg=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. SAIC <br /> ' Page 1 of 1 L <br />