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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 EDyr 24 6 <br /> Body Weight BW ke 70 15 <br /> Averaging Time-Non-cancer ATnc w 24 6 <br /> Averaging Time-Cancer ATca yr 70 70 <br /> INCIDENTAL INGESTION OF SOIL <br /> Exposure Fre uencv EFi d/T 350 350 <br /> Ingestion Rate IRs m d 100 200 <br /> DERMAL CONTACT WITH SOIL <br /> Exposure Frequency EFdc d/vr 100 350 <br /> Exposed Skin Surface Area SAs cm2 5.800 2,000 <br /> Soil-to-Skin Adherence Factor AF mg/CM2 1 1 <br /> INHALATION OF VOLATILES IN AIR <br /> Exposure Frequency EFa d/w 350 350 <br /> Inhalation Rate IRa to 3/d 20 10 <br /> Intake Rate(Inhalation) IR voc L/d 2 1 <br /> Residential Exposure Interval-cancer Tca sec 9.5E+08 <br /> Residential Exposure Interval-Nona ncer Tnc sec 1.9E+08 <br /> INGESTION OF GROUNDWATER <br /> Exposure Frequency EFdw d/vr 350 350 <br /> Intake Rate(Water) IRw L/d 2 1 <br /> DERMAL CONTACT WITH GROUNDWATER WHILE SHOWERING <br /> Exposure Time ET <br /> hr/da 0.25 0.14 4 15 min.baths/wcek <br /> Exposure Frequency EFswr d/ 350 350 <br /> Skin Surface Area SAswr cm'- 23,000 7.200 <br /> SOIL PROPERTIES <br /> Fraction Organic Carbon foe 0.02 unitless <br /> Soil Bulk Density pb 1.5 cm' <br /> Particle Density p 2.65 cm' <br /> Water Filled Soil Porositv Pw 0.15 unitless <br /> Soil Moisture Content Om 0.1 cm'/ <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 To <br /> Wind Speed V 2.25 m/sec <br /> Mbdng Height MH 2 In <br /> Particulate Matter PMIO 0.05 mgjm' <br /> Area of Contamination A 4.84E+06 cm2 <br /> DIFFUSIVITY IN AIR CONSTANTS <br /> Temperature T 298 "K <br /> Molecular Weight of Air MWa 28.8 male <br /> Absolute Pressure Pab I atmospheres <br /> Molecular Diffusion Volume of Air Va 20.1 cm'/mole <br /> UMTS CONVERSION FACTORS <br /> Conversion Factor from g to mg CF f I.E+O3 mg/g <br /> Conversion Factor from mg to kg CFm.r LE-06 kgJmg <br /> Conversion Factor from L to cm' CF,_, I.E-03 L/cm' <br /> islproject\6000s\6447\6447.007\lne slend alone doc\pea risk for surlandAs Page 2 of I8 <br />