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ATTACHMENT 3 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER NOT POTABLE <br /> INGESTION OF AND DERMAL CONTACT WITH non-VOCs in GROUNDWATER-Cancer <br /> Concentration <br /> Chemical Groundwater Permeability Oral Slope Excess Cancer <br /> (Cw) Constant (Kp) Factor(SFo) Risk <br /> (mg1L) (cm/hr) (mg/kg-d)-i (--) <br /> Benzene ND 0.021 0.1 NA <br /> Eth lbenzene ND 0.074 NA NA <br /> Toluene ND 0.045 NA NA <br /> Xylenes,Total ND 0.08 NA NA <br /> Acena hdtene ND 0.091807889 NA NA <br /> Benzo(a)anthracene ND 0.81 1.2 ND' <br /> Cluysene ND 0.81 0.12 ND <br /> Fluoranthene ND 0.36 NA ND <br /> Fluorene ND 0.123021212 NA NA <br /> Naphthalene ND 0.069 NA NA <br /> Phenanthrene ND 0.27 NA ND <br /> Pyrene ND 0.309773313 NA ND <br /> 0E+00 <br /> mow/ <br /> Risk,,,, = SF. x CW x IRw;aduk x EF x EDaduk <br /> BW,d„„ x AT x 365day/yr <br /> IR W.chifd x EF x ED,,, <br /> + SF. x C, x BW,,, x AT x 365day/yr <br /> + SF„ x CW x.SA.Wuu x Kr x EF x EDWAX Eradultx 11/1000 cm3 <br /> BW,", x AT x 365 days/yr <br /> + SF. x CW x SAW,d X KP x EF x EDOUX ErchU x 1L/1000 cm3 , <br /> BWchud x AT x 365 days/yr <br /> Parameter Symbol Values Units <br /> Exposure.Frequency EFdw 350 dlyr <br /> Exposure Duration-adult EDar 24 yr <br /> Exposure Duration-child EDcr 6 yr <br /> Body Weight-adult BWar 70 k <br /> Body Weight-child BWcr 15 k <br /> Averaging Time-Cancer ATca 70 yr <br /> Intake Rate-adult 1Rwar 2 L/d <br /> Intake Rate-child IRwcr 1 L/d <br /> Skin Surface Area-adult SAswrar 23,000 cm2 <br /> Skin Surface Area-child SAswrcr 7,200 cm2 <br /> Exposure Time-adult ETar 0.25 hr/da <br /> Exposure Time-child. ETcr 0.14 hr/da <br /> Conversion Factor from L to cm3 CFL-cn13 0.001 IJem <br /> pombo_based on UCLArisk gw non-VOCs Page 9 of 18 <br />