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where: j <br /> DI = intake of chemical due to inhalation (mg/kg-d) <br /> Ca = the concentration of chemical 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 Q is derived by using modeling results from either the soil volatile <br /> emission estimates with the box model or the shower volatilization emission estimates. <br /> Details on intake factors for the different receptors are provide in Section 4.5. <br /> p p I <br /> 4.4.5 Calculating Groundwater Ingestion <br /> Uptake of chemicals of potential concern via ingestion of contaminated groundwater is <br /> a function of the volume of water ingested per day, and the frequency and duration of <br /> exposure. Exposure of receptors to chemicals of potential. concern via ingestion of <br /> potentially contaminated groundwater was estimated using the following variables. <br /> 4 - <br /> DI = CS IR FI/BW <br /> where: <br /> DI = intake of chemical due to groundwater ingestion (liters/day) <br /> CS = concentration of chemicals in contaminated',groundwater (mg/1) <br /> IR = intake rate (liters/day) <br /> FI = fraction of water ingestion from contaminated source <br /> BW = body weight (kg) <br /> 4.5 EXPOSURE ASSUMPTIONS <br /> The potential intake amount received through the various exposure pathways is based <br /> on EPA guidance, site-specific information, and professional judgement. It is not <br /> possible to estimate the exact level of exposure .r.for specific individuals due to <br /> uncertainties in behavior patterns and incomplete,knowledge of exposure variable values. <br /> S:\LDC\YELLO.RPT May a, i"s 4-14 <br /> i <br />