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SECTIONFOUR Exposure Mamma <br /> Ca = the concentration of chernical in ambient air(mg/m3) <br /> IR = the inhalation rate(m3/hr) <br /> ET — daily exposure time(hr/day) <br /> BW = body weight(kg) <br /> The concentration Ca is derived by using modeling results for on site occupational exposures and off <br /> site residential exposures Details on intake factors for inhalation for the different receptors are provide <br /> in Section 4 5 <br /> 4.4.3.2 Calculating Groundwater Ingestion <br />' Uptake of chemicals of potential concern via ingestion of contaminated groundwater is a function of <br /> the volume of water ingested per day, and the frequency and duration of exposure Exposure of <br /> receptors to chemicals of potential concern via ingestion of potentially contaminated groundwater was <br /> estimated using the following variables <br /> DI = C,IR FT/BW <br /> where <br /> DI — intake of chemical due to groundwater ingestion(hters/day) <br /> C. = concentration of chemicals in contaminated groundwater(mg/1) <br /> 1R = intake rate(hters/day) <br /> FI = fraction of water ingestion from contaminated source <br /> BW = body weight(kg) <br /> The concentration of chemicals in groundwater was derived from the fate and transport modeling <br />' predicted for the hypothetical well located 1,000 feet downgradient for a residential receptor Details <br /> on the intake factors for groundwater ingestion are in Section 4-5 <br />' 4.4.3.3 Dermal Exposure <br /> Chemicals in soil that are in contact with skin may be absorbed across the skin into the bloodstream <br />' Absorption depends upon the amount of soil in contact with the skin, the concentration of chemicals in <br /> soil, the skin surface area exposed, and the potential for the chemical to be absorbed across skin, The <br /> tsteady-state dose absorbed is computed as follows <br /> D,b. = 10-6 G SA AF ABS EF ED/BW AT <br /> where <br />' D,b, =dermal absorbed dose(mg/kg/day) <br /> WoOdWwd4Ws ® T 119871973008NAWOCKTOM{ZEMRT1SHOREP01 DOM-FEB-86497900MMSNA 4-12 <br />