Laserfiche WebLink
ATTACHMENT 3 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> �.� 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER NOT POTABLE <br /> EXPOSURE PARAMETERS AND COi\TSTANTS <br /> Parameter Symbol Units Adult Resident Child Resident Source(s) <br /> ALL PATHWAYS <br /> Exposure Duration ED yr 24 6 <br /> Boy Weight BW k 70 15 <br /> 'Averaging Tune-Non-cancer ATnc r 24 6 <br /> Averaging Time-Cancer ATca r 70 70' <br /> INCIDENTAL INGESTION OF SOIL <br /> Exposure fraluency d/yr 1 350 350 <br /> Ingestion Rate IRs m d 100 200 <br /> DERMAL CONTACT WITH SOIL <br /> Exposure Frequency EFdc d/ r 100 350 <br /> Exposed Skin Surface Area SAs cm, 5,800 2,000 <br /> Soil-to-Skin Adherence Factor AF m cmZ 1 i <br /> INHALATION OF VOLATILES IN AIR. <br /> Exposure Frequency EFa d1yr 350 350 <br /> Inhalation Rate IRa m3/d 20 10 <br /> Intake Rate(inhalation) IRvoc L/d 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) 1Rw IJd 2 t <br /> �..� DERMAL CONTACT WITH GROUNDWATER WHILE SHOWERING <br /> Exposure Time ET br/day 0.25 0.14 4 15 min.baths/week <br /> Exposure Frequency EFswr d1yr 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 pb 1.5 glcd <br /> Particle Density p 2.65 cm3. <br /> Water Filled Soil Porosity Pw 0.15 unitless <br /> Soil Moisture Content Om 0.1 cm3/ I <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 to <br /> Particulate Matter PMIO 0.05 mg1d <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 mole <br /> Absolute Pressure Fab I atmospheres <br /> Molecular Diffusion Volume of Air Va 20.1 cm3 <br /> /mote <br /> UNITS CONVERSION FACTORS <br /> Conversion Factor from g to mg CF,-' I.E403 mg/g <br /> Conversion Factor from mg to kg CFm,�ke I.E-06 kg/mg <br /> Conversion Factor from L to cm3 CFL...1 I.E-03 L/cm3 <br /> pombo_based on UCLslexp and constants Page 2 of 18 <br />