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ARCADIS 1.0 INTRODUCTION This document presents a Preliminary Endangerment Assessment (PEA) Work Plan for the Gordon Research Company property located at 1085 South Union Road in Manteca, San Joaquin County, California ("the Site"; Figures 1 and 2). This PEA Work Plan was prepared by ARCADIS U.S., Inc. (ARCADIS) for the California Environmental Protection Agency (Cal/EPA) Department of Toxic Substances Control (DTSC). The DTSC is the lead agency for the site investigation and will review and approve all documents. ARCADIS has been retained by the DTSC to complete the PEA for the site. To accomplish this, ARCADIS has produced this Work Plan, which includes a Sampling and Analysis Plan(SAP), Quality Assurance Project Plan(QAPP), and Health and Safety Plan(HASP). Pending DTSC approval, ARCADIS will implement the Work Plan and produce the PEA report. The purpose of this Work Plan is to provide guidelines for the above-mentioned field sampling activities and laboratory analysis. The SAP has been prepared in accordance with DTSC Contract Agreement No. 09-T9057. The objective of this investigation is to either find the Site requires no further action or determine that further action is required. Field activities are scheduled for Wednesday, June 23 and Thursday, June 24, 2010. ARCADIS, a subcontractor to the DTSC, will be conducting the fieldwork. This PEA Work Plan has been developed based on previous investigation activities conducted at the Site and available information on past site operations. The following documents prepared for the Site were reviewed and used in the preparation of this PEA Work Plan: • "Imminent and Substantial Endangerment Determination and Order, Gordon Research Company Site, 1085 South Union Road, Manteca, California, Docket No.: I&SED 07/08-005," issued by the DTSC, dated November 28, 2007 ("the order"; DTSC 2007). • "Chemical Identification and Disposal Plan, Gordon Property, Manteca, California," prepared by Nichols Consulting Engineers and Clean Harbors, dated April 1, 2008 (Nichols and Clean Harbors 2008). • "Notice of Final Determination of Non-Compliance, Imminent and Substantial Endangerment Order I&SED 07/08-005, Gordon Research Company Site, 1085 South Union Road, Manteca, California," issued by the DTSC, dated July 6, 2009 ("the non-compliance order"; DTSC 2009). • "Completion Report, Chemical Identification and Disposal Plan, Gordon Property, Manteca, California," prepared by Nichols Consulting Engineers (Nichols), dated January 26, 2009. wp-PEA-Gordon-Jul IO-RV009808.doc: Page t