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4.0 <br /> F EXPOSURE ASSESSMENT <br /> rj <br /> 1� <br /> The objectives of this exposure assessment are to identify populations that may be <br /> exposed to chemicals in soil, the pathways by which exposures may occur, the route of <br /> intake and intake parameter values,and the frequency,magnitude, and duration of these r _ <br /> potential human exposures. The exposure assessment focuses on the chemicals of <br /> concern detected at the YFS site. The following steps were used to meet these <br /> objectives: <br /> Identification of potentially exposed receptor populations <br /> Identification of complete exposure pathways <br /> • Evaluation of the potential for release of chemicals from <br /> the source area 14N, <br /> Estimation of exposure point concentrations for specific J( <br /> pathways J . <br /> Estimation of chemical intakes for receptor populations <br /> associated with each complete exposure pathway. <br /> The results of this exposure assessment are pathway-specific intakes ... <br /> for each chemical of concern. These intakes were used in conjunction <br /> with chemical=specific critical toxicity values to evaluate potential <br /> human health risk in the receptor populations. <br /> 4.1 POTENTIAL RECEPTOR POPULATIONS <br /> Populations that may currently or in the future be potentially exposed to site-related <br /> contamination were identified to help assess the likelihood and extent of potential <br /> exposure to chemicals of concern. An evaluation of future land use was conducted to <br /> identify receptor populations that may be subject to a different risk in the future. Future <br /> land use plans are for the site to remain a trucking terminal. The potential receptors <br /> are primarily occupational employees. <br /> S:\LDC\YELLO.RPT May 4.1995 4-1 <br />