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t <br /> ATTACHMENT 3 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> NOW- POMBO PROPERTY <br /> 1755 WEST HTH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER NOT POTABLE <br /> INGESTION,DERMAL CONTACT,AND INHALATION OF VOCs in GROUNDWATER-Cancer <br /> Concentration Oral Slope Inhalation Excess Cancer <br /> Chemical Groundwater Factor(SFa) Slope.Factor Risk VOCs <br /> (CW) (SFi) <br /> (mg(L) (mg/kg-dY' (mg/kg-d)`1 (--1 <br /> Benzene ND 0.1 0.1 ND <br /> Eth lbenzene ND NA NA ND <br /> Toluene ND NA NA ND <br /> Xylenes,Total ND NA NA ND <br /> Acenaphthene ND NA NA ND <br /> Benzo(a)anthracene ND 1.2 0.39 ND <br /> Chrysenc ND 0.12 0.039 ND <br /> Fluoranthene ND NA NA ND <br /> Fluorene ND NA NA ND <br /> Naphthalene ND NA NA ND <br /> Phenanthrene ND NA NA ND <br /> rene ND NA NA ND <br /> O.OE+00 <br /> RisSF x C. x IRvac.�dA x.EF x )ED,, <br /> I <br /> kvOC,walcr = Riskw„�,.+ BWod„l x AT x.365days/yr <br /> SF xC xIR xEFxED <br /> +_ 1 w VOC,chiW child ' <br /> BW�,,;,d x AT x 365 days/yr <br /> Parameter Symbol Values Units <br /> Exposure Frequency EF 350 d/yr <br /> Exposure Duration-adult EDar 24 yrs <br /> Exposure Duration-child EDcr 6 yrs <br /> Body Weight-adult B War 70 k <br /> Body Wei ht-child BWcr 15 k <br /> Averaging Time-Cancer ATca 70 yrs <br /> Intake Rate-adult IRvocar 2 L/d <br /> Intake Rate-child IRvoecr 1 Ud <br /> pombo_based on UCLs\risk gw VOCs Page 10 of. 18 <br />