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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(RfDo) Reference Quotient <br /> Dose(RfDi) <br /> m /L cm/hr m /k -d m -d <br /> Eth lbenzene 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 /> Hazard (w = 1/RtD x Cw, x IRw x FF x ED <br /> + <br /> °) BW x AT x 365 day/yr <br /> (1/RfD,) x C. x IR..voc x EF x ED + <br /> BW x AT x 365 day/yr <br /> (I/RM.) x <br /> C. x SA x KP x ET x EF x ED x (IL)1000cm') <br /> BW x AT x 365 days/yr <br /> Parameter Symbol Value Units <br /> Expos ue 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 I L/d <br /> Intake Rate(inhalation) IRvoc 1 L/d <br /> Exposure Time ET 0.14 hr/d <br /> Surface Area SAswr 7200 cm'- <br /> conversion Factor-L to cm; CF,K , 0.001 L/cm' <br /> NA=Not Applicable <br /> is\project\6000s\6447\6447.00Thra stand alone doc\pea risk for surland.xls Page 12 of 18 <br />