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APPENDIX A-4 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <br /> TOXICITY CRITERIA <br /> Slope Factors SF Reference Doses(RfD) <br /> Chemical oral inhalation chronic oral chronic <br /> inhalation Source(s) <br /> (mg/kg-d)-' (mg/kg-d)"t (m -d) (m -d <br /> Eth Ibenzene NA NA 0.1 0.29 <br /> Toluene NA NA 0.2 0.11 <br /> Xylenes,Total NA NA 2 2 <br /> Acenaphthene NA NA 0.06 0.06 <br /> Chrysene 0.12 0.039 0.03 0.03 Pyrene <br /> Fluoranthene NA NA 0.04 0.04 <br /> Fluorene NA NA 0.04 0.04 <br /> Phenanthrene NA NA 0.04 0.04 Fluoranthene <br /> Pyrene NA NA 1 0.03 1 0.03 <br /> NA=Not Available <br /> r <br /> r <br /> is\project\6000s\6447\6447.007\hm stand alone doc\pea risk for surland.xls Page 4 of 18 <br />