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ATTACHMENT 2 <br /> IIUMAN HE,ALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> �,. 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER POTABLE <br /> EXPOSURE PARAMETERS AND CONTSTANTS <br /> Parameter Symbol Units Adult Resident Child Resident. Source(s) <br /> ALL PATHWAYS <br /> Exposure Duration ED YT 24 6 <br /> Body Weight BW kg 70 15 <br /> Averaging Time-Non-cancer ATnc yr 24 6 <br /> Averaging Time-Cancer Arca yr 70 70 <br /> INCIDENTAL INGESTION OF SOIL <br /> 'Exposure Frequency EFi d/yr 350 350 <br /> Ingestion Rate IRs mg1d 100 200 <br /> DERMAL CONTACT WITH SOIL <br /> Exposure Frequency EFdc dlyr 100 350 <br /> Exposed Skin Surface Area SAs cm2 5,800 2,000 <br /> Soil-to-Skin Adherence Factor AF m cm2 l i <br /> INHALATION OF VOLATILES IN AIR <br /> Exposure Frequency EFa d/yr 350 350 <br /> Inhalation Rate lRa m3/d 20 10 <br /> Intake Rate(Inhalation) IRvoc L/d 2 1 <br /> Residential Exposure Interval-cancer Tca see 9.5E+08 <br /> Residential Exposure Interval-Noncancer Tnc sec 1.9E+08 <br /> INGESTION OF GROUNDWATER <br /> Exposure Frequency EFdw d/ r 350 350 <br /> Intake Rate(Water) lRw L/d 2 1 <br /> DERMAL CONTACT WITH GROUNDWATER WHILE SHOWERING <br /> Exposure Time ET hr/day 0.25 0.14 4 15 min.baths/week <br /> Exposure Frequency EFswr d/ r 350 350 <br /> Skin Surface Area SAswr cm2 23,000 7,200 <br /> SOIL PROPERTIES <br /> Fraction Organic Carbon foe 0.02 unitless <br /> Soil Bulk Density b 1.5 g1cm, <br /> Particle Density 2.65 cm3 <br /> Water Filled Soil Porosity Pw 0.15 unitless <br /> Soil Moisture Content Em 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 /> Mixing Height MH 2 m <br /> Particulate Matter PM10 0.05 mg/ml <br /> Area of Contamination I A 4.84E+06 cm2 <br /> DlFFUSIVI'ITY IN AIR CONSTANTS <br /> Temperature T 298 °K <br /> Molecular Weight of Air MWa 28.8 g1mole <br /> Absolute Pressure Pab 1 atmospheres <br /> Molecular Diffusion Volume of Air Va 20.1 cm3/mole <br /> UNITS CONVERSION FACTORS <br /> Conversion Factor from g to mg Cr,,.,, I.E+03 mg/g <br /> Conversion Factor from mg to kg Cr=-x 1.E-06 kg/mg <br /> Conversion Factor from L to cm3 CFi.,m3 1.E-03 Ucm3 <br /> pombo based on UCLs\exp and constants Page 2 of 18 <br />