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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) (m -d)_t (—) <br /> Chrysene 1.7E-08 0.039 9.6E-11 <br /> ' 1E-10 <br /> IRedWt x EF x EDeduh <br /> ' Risk,h = SF, x C. x BW,d„„ x AT x 365days/yr <br /> IR,,,hdd x EF x ED.... <br /> + $F, xC, x <br /> ' BW,edd x AT x 365 day/yr <br /> Parameter Symbol Values Units <br /> ' <br /> Exposure Frequency EFa 350 days <br /> Exposure Duration-adult EDar 24 yrs <br /> Exposure Duration-child EDcr 6 yrs <br /> Bodv Wei t-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 /> is\project\6000s\6447\6447.007Vva stand alone doc\pea risk for surland.xls Page 15 of 18 <br />