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ATTACHMENT 2 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER POTABLE <br /> INGESTION,DERMAL CONTACT AND INHALATION OF VOCs IN GROUNDWATER-Non-cancer <br /> Concentration Oral Chronic Inhalation <br /> Chemical Groundwater Permeability Reference 'chronic Hazard <br /> (Cw) Constant (Kp) Dose(Rmo) Reference Quotient <br /> Dose(RfDi) <br /> (m ) (cm/hr) (m -d) (m -d) (--) <br /> Benzene 0.0006 0.02 0.003 0.0017 3.6E-02 <br /> Eth lbenzene 0.0016 0.07 0.1 0.29 1.5E-03 <br /> Toluene 0.0026 0.05 0.2 0.11 2.4E-03 <br /> Xylenes,Total 0.004 0.08 2 2 2,7E-04 <br /> Acenaphthene ND 0.09 0.06 0.06 ND <br /> Benzo(a)anthracene ND 0.81 NA NA NA <br /> .Chrysene ND 0.81 NA NA NA <br /> Fluoranthene ND 0.36 0.04 0.04 NA <br /> Fluorene 0.0002 0.12 0.04 0.04 6.8E-04 <br /> Na hthalene ND 0.07 0.02 0.00086 ND <br /> Phenanthrene 0.0003 0.27 0.3 0.3 NA <br /> Pyrene ND 0.31 0.03 0.03 NA <br /> ew.. 4.0E-02 <br /> _ C. xIR.� xEFxED <br /> Hazard w - (1/RfD°)x BW x AT x 365 day/yr <br /> C. x IR„,v0 x EF x ED <br /> (1/RfD,) x BW x AT x 365 day%yr + <br /> C. is SA x Kp x ET x EF x ED x (1U1000cm3) <br /> (1/R.fD°) x BW.x.AT x 365 days/yr <br /> Parameter Symbol Value Units <br /> Exposure Frequency EF 350 d/ i <br /> Exposure Duration ED 6 yrs <br /> Body Weight BW 15 kg <br /> Averaging Time-Non-cancer ATnc. 6 yrs <br /> Intake Rate(water) IRw 1 Ud <br /> Intake Rate(inhalation) IRvoc 1 L/d <br /> Exposure Time ET 0.14 hr/d <br /> Surface Area SAswr 7200' cm2 <br /> Conversion Factor-L to cm CF1_ciii3 0.001 L/cm3 <br /> pombo_based on UCLs\HQ gw VOCs Page 12 of 18 <br />