ARCHIVED REPORTS HUMAN HEALTH SCREENING EVALUATION ADDENDUM

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TABLE 27 ESTIMATION OF AIR CONCENTRATIONS FOR VOCS SURLAND HOMES-BRIDLE CREEK Tracy,San Joaquin County,California Residential Scenario I Residential Scenario 2 Construction Worker Scenario COPC Ei m /sec) Cs(mg/kg) Ca(m m') Ei(m /sec) Cs(m /k ) Ca(m /m') Ei(m /sec) Cs m /k ) Ca(m /ta) BTEX Toluene 2.7E-06 0.001 2.8E-08 2.7E-06 0.001 2.8E-08 8.2E-06 0.003 8.3E-08 Eth (benzene LSE-OS 0.007 1.5E-07 1.5E-OS 0.007 1.5E-07 6.5E-06 0.003 6,5E-08 X lene s 1.IE-05 0.005 I.IE-07 2.2E-06 0.001 2.2E-08 6.7E-06 0.003 6.7E-08 PAHs Acenaphthene 6.0E-05 0.29 6.1E-07 4.3E-05 0.21 4.4E-07 3.7E-05 0.18 3.8E-07 Anthracene 5.2E-06 0.26 5.3E-08 4.6E-06 0.23 4.7E-08 2.8E-06 0.14 2.8E-08 Benzo(a)anthracene NA 0.19 NA NA 0.031 NA NA 0.058 NA Benzo a ene NA 0.011 NA NA 0.0070 NA NA 0.0063 NA Benzo b fluoranthene NA 0.056 NA NA 0.055 NA NA 0.054 NA Benzo(g,hj)pery1ene NA 0.21 NA NA 0.078 NA NA 0.058 NA Benzo k fluoranthene NA 0.00067 NA NA 0.00067 NA NA 0.0067 NA Ch Bene NA 0.11 NA NA 0.110 NA NA 0.063 NA Dibenz a,h anthracene NA 0.0073 NA NA 0.0067 NA NA 0.0073 1 NA Fluoranthene NA 0.068 NA NA 0.066 NA NA 0.039 NA Fluorene 3.1E-05 0.87 3.1E-07 2.5E-05 0.70 2.5E-07 2.0E-05 0.57 2.1E-07 Naphthalene 5.0E-04 1.9 5.0E-06 1.6E-04 0.61 1.6E-06 2.9E-04 1.1 2.9E-06 Phenanthrene NA 1.2 NA NA 0.88 NA NA 0.60 NA Pyrene NA 0.19 NA NA 0.19 1 NA NA 0.099 NA METALS Barium NA 230 NA NA 223 NA NA 211 NA Be Ilium NA 0.94 NA NA 0.93 NA NA 0.82 NA Chromium Trivalent NA 48.0 NA NA 47 NA NA 44 NA Cobalt NA 14.0 NA NA 13 NA NA 12 NA Copper NA 185 NA NA 122 NA NA 103 NA Lead NA 40 NA NA 12 NA NA 16 NA mercury NA 0.019 NA NA 0.015 NA NA 0.014 NA Molybdenum NA 1.0 NA NA 0.82 NA NA 0.71 NA Nickel NA 43 NA NA42 NA NA 39 NA Vanadium NA R2.0 NA NA 81 NA NA 76 NA Zinc NA 143 NA NA 113 NA NA 85 NA Equation: Ca=Ei/99 Where: Ca-ambient air concentration,mg/m3 Ei=total emission rate for compound i(mg/second); Page I of 2 SSI IC..