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---- — _ ----- LElNFEL®E3Z <br /> 2 PEA OBJECTIVES <br /> A PEA is conducted to evaluate whether current or past chemical use practices on-site <br /> have resulted in residual concentrations of potentially hazardous substance(s), which <br /> may pose a threat to public health or the environment. <br /> The objectives of the PEA include: <br /> • Evaluating existing historical information for indications of the past use, storage, <br /> disposal, or release of hazardous wastes/substances at the site; <br /> • Establishing through a field sampling and analysis program, the nature of <br /> hazardous waste/substances (if present), their concentrations and potential to be <br /> present in soil; <br /> • Estimating the potential threat to public health and/or the environment posed by <br /> hazardous constituents at the site using a industrial land-use scenario; <br /> On the basis of the information developed during the PEA, the DTSC will make an <br /> informed decision regarding potential risks posed by the site. Possible outcomes of the <br /> PEA decision are: <br /> • Further investigation through the Remedial Investigation/Feasibility Study (RI/FS) <br /> process if the site is found to be significantly impacted by a hazardous substance <br /> release; <br /> • Perform a Removal Action Plan if localized impacts by a hazardous substance <br /> release is found. <br /> If the site is not significantly impacted, and the risks to human health and the <br /> environment are found to be within acceptable levels based on the screening level risk <br /> assessment, an issuance of a "No Further Action" and site approval finding will be <br /> made by DISC. <br /> 57252.T02/ST05R999/DH:ly Page 4 of 29 <br /> ©2005 Kleinfelder, Inc. September 1,2005 <br />