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ATTACHMENT 4 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> 95% UCL;GROUNDWATER POTABLE <br /> INGESTION OF AND DERMAL CONTACT WITH non-VOCs in GROUNDWATER-Cancer <br /> Concentration Oral Slope Excess Cancer <br /> Chemical Groundwater Permeability <br /> (Cw) Constant (Kp) Factor(SFo) Risk <br /> (mg/L) (cm/hr) (m -d)'t (--) <br /> Benzene 0.00043 0.021 0.1 NA <br /> Eth !benzene 0.00093 0.074 NA NA <br /> Toluene 0.0015 0.045 NA NA <br /> Xylenes,Total 0.0025 0.08 NA NA <br /> Acenaphthene 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 0.00013 0.123021212 NA NA <br /> Naphthalene ND 0.069 NA NA <br /> Phenanthrene 0.00018 0.27 NA NA <br /> Pyrene ND 0.309773313 NA ND <br /> 0E+00 <br /> �. IRw.,d,k x EF x EDad�k <br /> Risk,.,, = SF, x C, x BW.,, x AT x 365 day/yr <br /> + SFo XCw X IRw,W X EF X EDehia <br /> BW,,,, x AT x 365 day/yr <br /> + SF„ x C,, x SAgd„i, x Kr 'x EF x ED,,d„i,x Er„d„„ x 11)1.000 cm3 <br /> BW.d;,,, x AT x 365 days/yr <br /> + SF x C x SAcniia X KP x EF x.EQ,,,,,,x ET01ild x IU1000 cm3 I <br /> ° W BW,,,,,, x AT x.365 days/yr <br /> Parameter Symbol Values Units <br /> Exposure Frequency EFdw 350 dlyr <br /> Eximsure 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 lRwar 2 LJd <br /> Intake Rate-child IRwer 1 L/d <br /> Skin Surface Area-adult SAswrar 23,000 cm2 <br /> Skin Surface Area-child SAswrer 7,200 cm2 ; <br /> Exposure Time-adult ETar 0.25 hr/dayI$ <br /> Exposure Time-child ETcr 0.14 lidday i <br /> Conversion Factor from L to cm3 CFL_c,n3 0.001 L/cm, <br /> pombo_based ou UCLArisk gw non-VOCs Page 9 of 18 <br />