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evaluated with these differences in mind. Similarly, the <br /> way in which the different soils areas and different <br /> groundwater plumes will be assessed should be further <br /> clarified. <br /> lo. Page 4-9, section 4.4 <br /> The exposure assessment plan does not provide detail on the <br /> exposure pathways to be evaluated, nor on the types of <br /> exposure scenarios that will be considered in the risk ' <br /> assessment. This section refers the reader to Section 4 .2 <br /> where the site conceptual models are discussed for a. <br /> description for the exposure pathways. However, although <br /> migration pathways are mentioned in that section, actual <br /> pathways of exposure to potential receptors are not <br /> identified. <br /> Also, Section 4 . 4 fails to fully identify the exposure <br /> scenarios that will be evaluated in the risk assessment. <br /> Mention is made of onsite workers, remedial workers, and <br /> local residents, but specific scenarios for evaluation of <br /> exposures for each of these groups of receptor types are not :C <br /> identified. <br /> The ecological assessment portion of the plan does not <br /> provide sufficient detail on identification of receptors of <br /> concern, their habitats, or their potential pathways of <br /> exposure. <br /> il. Page 4-11, section 4.5 <br /> No detail is provided on how intake rates will be determined <br /> for the receptors of concern, or for each possible exposure <br /> scenario. Although the text states that site-specific <br /> parameters are preferred over default values, no indication <br /> is provided on what those site-specific parameters are or <br /> how their values will be generated. <br /> 12 . Page 4-11, section 4 . 6 <br /> No detail is provided on the potential chemicals of concern <br /> for the site, nor identification of what toxicity values <br /> will be used in the assessment. Similarly, for the <br /> ecological assessment, no information is provided on which <br /> site-specific endpoints are to be considered in the <br /> assessment. <br /> 13 . Page 4-12, section 4.7 <br /> The section on risk characterization does not provide detail <br /> on how risks will be characterized for the site. No <br /> descriptions of risk calculations are provided. <br /> II-3 <br />