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KLEINFELDER <br /> 7 HUMAN HEALTH AND ECOLOGICAL SCREENING EVALUATION <br /> A human health screening evaluation will be conducted to estimate the potential chronic <br /> health hazard from potential contamination at the site. It is unlikely that potential <br /> exposures to ecological receptors will need to be evaluated, because the site is located <br /> in an existing urban setting including residential areas. If exposure pathways to <br /> ecological receptors are identified, a screening ecological assessment will be <br /> conducted in accordance with the PEA Guidance Manual and consultation with the <br /> DTSC. <br /> The human health screening evaluation will assess the following four criteria in <br /> accordance with the PEA Guidance Manual: <br /> • Construction of a conceptual model for the property identifying receptor <br /> groups, exposure media, and exposure pathways; <br /> • Identification of chemicals of potential concern (COPC) and their physical <br /> constants and concentrations, including metals above background <br /> concentrations, to evaluate industrial exposure; <br /> • Description of human toxicity information of the specific COPC, and <br /> • A risk characterization summary of the exposure assessment and toxicity <br /> information for each chemical and exposure pathway. <br /> A conceptual site model has been developed for the site and is included as Figure 1 <br /> in Appendix E. <br /> 57252.T02/ST05R999/DH:ly Page 24 of 29 <br /> ©2005 Kleinfelder, Inc. September 1, 2005 <br />