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ATTACHMENT 2 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> 4,. POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER POTABLE <br /> INHALATION OF VOCS AND NON-VOCS IN AIR FROM SOIL-Cancer <br /> CoInhalationExcessExcess <br /> Chemical Slope Factor <br /> Air (Ca} (SFi) Cancer Risk <br /> (ingtxW) (mg/kg-d)" (--) <br /> Benzene NA 0.1 NA <br /> Eth ylbenzene 7.6E-04 NA NA <br /> Toluene 3.4E-03 NA NA <br /> Xylenes,Total 1.6E-03 NA NA <br /> i <br /> Acenaphthene 3.4E-05 NA NA <br /> Benzo(a)anthracene 6.5E-09 0.39 3:813-10 <br /> Chrvsene 2.7E-08 0.039 L6E-10 <br /> Fluoranthene 4.9E-09 NA NA <br /> Fluorene 3.0E-05 NA NA <br /> Naphthalene 1.8E-04 NA NA <br /> Phenanthrene 2.6E-07 NA NA <br /> Pyrene 1.4E-08 NA NA <br /> 5E-10 <br /> Risk,,, = SF x C. x IR.d,d,x EF x ED.adw, <br /> BW.,,,, x AT x 365 days/yr <br /> + SF, xx IRs,dnud x EF x EDCW,d <br /> C, <br /> BWc,,;,d x AT x 365 day/yr <br /> Parameter Symbol Values Units <br /> Exposure Frequency EFa 350 days <br /> Exposure Duration-adult EDar 24 yrs <br /> Exposure Duration-child EDcr G yrs <br /> Body Weight-adult BWar 70 k <br /> Body Weight-child BWer 15 k <br /> Averaging Time-Cancer ATca '70 yrs <br /> Inhalation Rate-adult IRaar 20 m3/d <br /> Inhalation Rate-child Macr 10 m3 <br /> /d <br /> � f <br /> pombo_based on UCLsVisk air Page 15 of 18 <br />