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r <br /> .4.2.1 Exposure Pathways <br /> This section discusses the potential release and transport of chemicals from subsurface <br /> soil at the site and identifies exposure pathways by which the receptor populations <br /> identified in Section 4.1 may be potentially exposed to chemicals. �' <br /> An exposure pathway describes a specific environmental pathway by which an individual <br /> can be exposed to chemical constituents present at or"originating from a source. An <br /> exposure pathway includes five necessary elements: <br /> • A source of chemical ° <br /> • A mechanism of chemical release to the environment <br /> • An environmental transport medium <br /> • A point of potential human contact <br /> • A human intake route <br /> Each of these five elements must be present for an exposure pathway to be complete <br /> and for chemical intake to occur. Incomplete exposure pathways do not result in human <br /> exposures. Without exposure; there can be no risk; :therefore, incomplete exposure <br /> pathways have, not been included in the risk characterization process. This section <br /> focuses on the complete exposure pathways that-have been identified for the subsurface <br /> soil (the chemical source) at the YFS site. <br /> 1 � <br /> 4.2.2 Chemical Release Mechanisms and Transport'Media <br /> Chemical constituents present in'the subsurface soil have been identified as a potential <br /> source for chemical release. Environmental media potentially involved in the transport <br /> of chemical constituents from this source include` soil, groundwater, and air. The , <br /> ingestion of groundwater, inhalation of chemicals from soil volatilization, inhalation of <br /> contaminated groundwater while showering,• and-dermal'contact with contaminated <br /> groundwater while showering were quantitatively evaluated for potential health risk and <br /> hazards as part of this risk assessment. f`' <br /> SALDOYELLO."T May 4,1995 4'3 <br />