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APPENDIX A-9 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <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 /kg-d)-t ( ) <br /> Chrysene 0.0002 0.81 0.12 9.9E-07 <br /> 1E-06 <br /> ' IRw...t x EF x ED.dwr <br /> Riskw,p = SF. x Cw x BW,dw, x AT x 365day/yr <br /> IRw.«m x EF x ED.mw <br /> + SF° x C. x <br /> BW,aid x AT x 365day/yr <br /> + SF x C x SAadan x KP x EF x EDd°hx Erd„1t x IL1000 cm3 <br /> ° BW.dwl x AT x 365 days/yr <br /> + SF. xCwx SAw,ild x KP x EF x EDchild x Er hild x 1L/1000 cm3 <br /> BW6ild x AT x 365 days/yr <br /> Parameter Symbol Values Units <br /> Exposure Frequency EFdw 350 d/ <br /> Exposure Duration-adult EDar 24 <br /> Exposure Duration-child EDcr 6 <br /> BodyWeight-adult BWar 70 k <br /> Bad Weight-child BWcr 15 k <br /> Averaging Time-Cancer ATca 70 yr <br /> Intake Rate-adult IRwar 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 0.14hr/da <br /> Conversion Factor from L to cm3 CFL..m3 0.001 L/cm3 <br /> NA=Not Applicable <br /> ' is\project\6000s\6447\6447.007\hra stand alone doc\pea risk for surland.xls Paec 9 of 18 <br />