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APPENDIX A-12 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <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(RtDo) Reference Quotient <br /> Dose(RfDi) <br /> (m /L) cm/hr (mg/kg-d m -d <br /> Eth (benzene 0.0017 0.074 0.1 0.29 1.5E-03 <br /> ' Toluene 0.0007 0.045 0.2 0.11 6.4E-04 <br /> Xylenes,Total 0.0054 0.08 2 2 3.6E-04 <br /> Acenaphthene 0.0013 0.09 0.06 0.06 2.9E-03 <br /> ' Fluorene 0.0034 0.12 0.04 0.04 1.2E-02 <br /> 1.7E-02 <br /> C xIR�, xEFxED <br /> Hazardw = (1/RfD°) x BW x AT x 365 day/yr + <br /> (I/Rf4) x C. x IRw.voc x EF x ED + <br /> BW x AT x 365 day/yr <br /> C. xSAxK. xETxEFxEDx (IUm <br /> 1000c ) <br /> (1/RfD°) x <br /> BW x AT x 365 days/yr <br /> Parameter Symbol Value Units <br /> Exposure Frequency EF 350 d <br /> Exposure Duration ED 6 yrs <br /> Body Weight BW 15 k <br /> Averaging Time-Non-cancer ATnc 6 yrs <br /> Intake Rate(water) IRw 1 L/d <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' CFI.°m3 0.001 L/cm' <br /> ' NA=Not Applicable <br /> is\project\6000s\6447\6447.007Utra stand alone doc\pea risk for surland.xls Page 12 of 18 <br />