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t ATTACIIMENT 4 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> 95%UCL,GROUNDWATER POTABLE <br /> EXPOSURE PARAMETERS AND CONTSTANTS <br /> Parameter S mbol Units Adult Resident Child.Resident Source(s) <br /> ALL PATHWAYS <br /> Exposure Duration ED yr 24 6 <br /> Body Weight BW kg 70 15 <br /> Averaging Time-Non-cancer ATnc yr 24 6 <br /> Averaging Time-Cancer ATca yr 70 70 <br /> INCIDENTAL INGESTION OF SOIL <br /> Exposure Firguency EFi d/yr 350 350 <br /> Ingestion Rate IRs mgtd 100 200 <br /> DERMAL CONTACT WITH SOIL <br /> Exposure Frequency EFdc ��d2/ r too 350 <br /> Fac osed Skin Surface Area SAs m5,800 2,000 <br /> Soil-to-Skin Adherence Factor AF m cm2 1 I <br /> INHALATION OF VOLATILES IN AIR <br /> Exposure Frequency EFa d/yr 350 350 <br /> Inhalation Rate IRa m'/d 20 10 <br /> Intake Rate(Inhalation) IRvoc Ud 2 1 <br /> Residential Exposure Interval-cancer Tea see 9.5E+08 <br /> Residential Exposure Interval-Noncancer Tnc sec 1.9E+08 <br /> INGESTION OF GROUNDWATER <br /> ? <br /> Exposure Frequency EFdw d/yr 350 350 <br /> Intake Rate(Water) IRw Ud 2 1 <br /> Nap. DERMAL CONTACT WITH GROUNDWATER WHILE SHOWERING <br /> Exposure Time ET I hr/dav 0.25 0.14 4 15 min.bathstweek <br /> Exposure Frequency EFswr d/ r 350 350 <br /> Skin Surface Area SAswr cmZ 23,000 1,200 <br /> SOIL PROPERTIES <br /> Fraction Organic Carbon foc 0.02 unitless <br /> Soil Bulk Density b 1.5 cm3 <br /> Particle Density 2,65 cm3 <br /> Water Filled Soil Porosity Pw 0.15 unitless <br /> Soil Moisture Content ©m 0.1 cm3/ <br /> Air Filled Soil Porosity I 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 /> Mixing Height MH 2 m <br /> Particulate Matter PM10 0.05 m m3 <br /> Area of Contamination A 4.84E+06 cm2 r <br /> DIFFUSIVITY IN AIR CONSTANTS I <br /> Temperature T 298 'K <br /> 1Vlolecular Weight of Air MWa 28.8 glmole <br /> Absolute Pressure Pab I atmos heres <br /> Molecular Diffusion Volume of Air Va 20.1 cm3/mole <br /> UNITS CONVERSION FACTORS <br /> Conversion Factor from g to mg CF.-.. 1.1.+03 mg/g <br /> Conversion Factor from mg to kg CF„,,-,,g LE-06 kg/mg <br /> Conversion Factor from L to cm3 CFI,.,3 LE-03 Ucm3 <br /> pombo_based on UCLs\exp and constants Page 2 of 18 <br />