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ATTACHMENT 2 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER POTABLE <br /> INGESTION,DERMAL CONTACT,AND INHALATION OF VOCs in GROUNDWATER-Cancer <br /> Concentration Inhalation <br /> Chemical Groundwater Oral Slope Slope Factor Excess Cancer <br /> Factor(SFo) Risk VOCs <br /> (Cw) (SFi) <br /> (mom) (mgtkg-dY' (mg/kg-d)*' (--) <br /> Benzene 0.0006 0.1 0.1 1.8E-06 <br /> Eth lbenzene 0.0016 NA NA NA <br /> Toluene 0.0026 NA NA NA <br /> Xylenes,Total 0.004 NA NA NA <br /> Acenaphthene ND NA NA ND <br /> t Benzo(a)anthracene ND 1.2 0.39 ND <br /> Chrysene ND 0.12 0.039 ND <br /> Fluoranthene ND NA NA ND <br /> Fluorene 0.0002 NA NA NA <br /> Naphthalene ND NA NA ND <br /> Phenanthrene 0.0003 NA NA NA <br /> Pyrene ND NA NA ND <br /> 1.8E-06. <br /> ~ SF xCxIR xEFXm <br /> — Riskµ. + ' voc,auk �am� <br /> Risk <br /> voc,WaKr — '"` BW x AT x 365 days/yr <br /> SF, x C,,, x IR,.,,,�,, x EF x EDc,,;W <br /> BW,wu x AT x 365 days/yr <br /> Parameter Symbol Values Units <br /> Exposure Fregwency EF 350 d/yr <br /> Exposure Duration-adult EDar 24 yrs <br /> Exposure Duration-child EDcr 6 yrs <br /> Body Weight-adult BWar 70 k <br /> Body Weight-child BWcr 15 k <br /> Averaging Time-Cancer ATca 70 yrs <br /> Intake Rate-adult 1Rvocar 2 L/d <br /> Intake Rate-child IRvoccr I L/d <br /> 1 <br /> pombo_based on UCLslrisk gw VOCs Page 10 of 18 <br />