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APPENDIX A-15 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <br /> RISK FOR AIR-Cancer <br /> Concentration Inhalation Excess <br /> Chemical Air (Ca) Slope Factor Cancer Risk <br /> (SFi) <br /> (mg/m') (mg/kg-d)" (—) <br /> Chrysene 1.7E-08 0.039 9.6E-11 <br /> IE-10 <br /> Risk,;, = SF, x C. x <br /> IR,d,,, x EF x ED.dmi <br /> BW,d.I, x AT x 365days/yr <br /> + SF x C. x IR:.,had x EF x ED.hdd <br /> BW,had 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 6 yrs <br /> Body Weight-adult BWar 70 k <br /> Body Weight-child BWcr 15 k <br /> .Averaging Time-Cancer ATca 70 yrs <br /> Inhalation Rate-adult IRaar 20 m'/d <br /> Inhalation Rate-child IRacr 10 m'/d <br /> NA=Not Applicable <br /> i:\project\6000s\6447\6447.007\Irra stand alone doc\pea risk for surlmd.xls Page 15 of 18 <br />