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APPENDIX A-2 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <br /> EXPOSURE PARAMETERS AND CONSTANTS <br /> Parameter Symbol Units Adult Resident Child Resident Source(s) <br /> ALL PATHWAYS <br /> Exposure Duration ED yr 24 6 <br /> Body Weight BW kg 70 6 <br /> Averaging Time-Non-cancer ATne yr 24 6 <br /> Averaging Time-Cancer ATca yr 70 70 <br /> INCIDENTAL INGESTION OF SOIL <br /> Exposure Fre uen EFi d/ 350 350 <br /> Ingestion Rate Bts m d 100 200 <br /> DERMAL CONTACT WITH SOIL <br /> Exposure Frequency EFdc d/yr 100 350 <br /> Exposed Skin Surface Area SAs cm2 5,800 2,000 <br /> Soil-to-Skin Adherence Factor AF Mg/CM2 1 I <br /> INHALATION OF VOLATILES IN AIR <br /> Exposure Frequency EFa d/ 350 350 <br /> hllialation Rate IRa m3/d 20 10 <br /> Intake Rate Inhalation) Ilivoc Ud 2 1 <br /> Residential Exposure Interval-cancer Tca sec 9.5E+08 <br /> Residential Exposure Interval-Noncancer Tne sec 1.9E+08 <br /> INGESTION OF GROUNDWATER <br /> Exposure Frequency EFdw d/yr 350 350 <br /> Intake Rate Water IRw Ud 2 1 <br /> DERMAL CONTACT WITH GROUNDWATER WHILE SHOWERING <br /> Ex sure Time ET hr/day 0.25 0.14 4 15 min.baths/week <br /> Exposure Frequency EFswr d/yr 350 350 <br /> Skin Surface Area SAswr cm2 23,000 7,200 <br /> SOIL PROPERTIES <br /> Fraction Organic Carbon foc 0.02 unitless <br /> Soil Bulk Density ph 1.5 cm3 <br /> Particle Density p 2.65 cm3 <br /> Water Filled Soil Porosity Pw 0.15 unitless <br /> Soil Moisture Content Om 0.1 cm3/ <br /> Air Filled Soil Porosity Pa 0.284 unitless <br /> Total Soil Porosity Pt 0.434 unitless <br /> SITE-SPECIFIC PROPERTIES <br /> Length of Area-residential LS 22 m <br /> Wind Speed V 2.25 msec <br /> Moong Height MH 2 to <br /> Particulate Matter PM10 0.05 mg/m, <br /> Area of Contamination A 4.84E+06 cm' <br /> DIFFUSMTY IN AIR CONSTANTS <br /> Temperature T 298 °K <br /> Molecular Weight of Air Ma 28.8 mole <br /> Absolute Pressure P 1 atmospheres <br /> Molecular Diffusion Volume of Air Va 20.1 cm3/mole <br /> UNITS CONVERSION FACTORS <br /> Conversion Factor from g to mg CF, LE+03 mg/g <br /> Conversion Factor from mg to kg CFm_k LE-06 kg/mg <br /> Conversion Factor from L to cm3 CF,, LE-03 Ucm3 <br /> is\project\6000s\6447\6447.007\Ina stand alone doclpea risk for surland.xls Page 2 of 18 <br />