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ARCADIS This PEA Work Plan contains a summary of existing site data, a SAP (Section 3.0), a QAPP (Appendix A), and a site-specific HASP(Appendix B). Comments received from the DTSC were incorporated into the final HASP. This PEA Work Plan was prepared and will be implemented in general accordance with the U.S. Environmental Protection Agency's (U.S. EPA's) "Sampling and Analysis Plan, Guidance and Template" (U.S. EPA 2004) and DTSC guidelines as detailed in the Preliminary Endangerment Assessment Guidance Manual ("the DTSC PEA Guidance Manual"; DTSC 1999). The scope of the PEA was provided by the DTSC in Contract Agreement No. 09-T9057. Project scoping was conducted via e-mail and telephone conversations between the DTSC and ARCADIS during March and April 2010 and during a scoping meeting on April 14, 2010 with representatives of ARCADIS and the DTSC. 1.1 PEA Objectives and Scope A PEA is generally performed to help evaluate whether current or historical activities have resulted in environmental conditions that may need to be evaluated and/or addressed to move forward with redevelopment planning, or with the implementation of proposed redevelopment plans. The overall objective of the PEA is to evaluate whether hazardous materials are present at the Site that may pose unacceptable human health and environmental risks in the context of future reuse. To meet this objective, the PEA will include the following scope of work: • Evaluating available information for indications of current or past use, storage, disposal, release, or threatened release of hazardous substances at the Site. • Assessing if there are hazardous materials/substances/wastes present in the soil and/or debris at the Site at concentrations that exceed conservative screening levels assuming a residential land use scenario. • Estimating the potential threat to public health posed by hazardous substances at the Site, by using the human health screening evaluation procedure in the DTSC PEA Guidance Manual, which is based on an assumed residential land-use scenario. • Estimating the potential threat to the environment posed by hazardous substances at the Site, by using the environmental screening evaluation procedure described in the DTSC PEA Guidance Manual or associated DTSC directives. Based on the information developed during the PEA, ARCADIS will make recommendation(s) regarding the need for further action at the Site. Page 2 wp-PEA-Gordon-Jul IO-RV009808.doc: