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PRELIMINARY ENDANGERMENT ASSESSMENT Metalsa Structural Products,Inc. EPA I.D. Number CA0000142331 Docket HWCA: P1-13/14-002 1550 Industrial Drive, Stockton, California June 17,2014 1.0 INTRODUCTION This document presents the Preliminary Endangerment Assessment (PEA) Workplan for the Metalsa Structural Products property located at 1550 Industrial Drive in Stockton, CA ("the Site;" Figure 1). GeoRestoration, Inc. (GRI) has been retained by Metalsa Structural Products, Inc. to complete the PEA for the site. When approved by the Department of Toxic Substances Control (DTSC), GRI will implement the workplan and complete the PEA report. The workplan has been developed based on past site operations and previous investigation work. Documents reviewed for the site are as follows: • Department of Toxic Substances Control,Final Corrective Action Consent Agreement for the Metalsa Structural Property located at 1550 Industrial Drive, Stockton, California, May 20, 2014. • ENVIRON International Corporation, Phase 1 Environmental Site Assessment and Limited Environmental Compliance Review, Dana Holding Corporation, 1550 Industrial Drive, Stockton, California, February 2010. • ENVIRON International Corporation, Phase Il Environmental Site Assessment, Dana Holding Corporation, 1550 Industrial Drive, Stockton, California, 2010. This workplan provides guidelines for field sampling and laboratory analysis. The investigation results will be used to determine if further action or no further action is required. Field activities are scheduled for Julyl and 2,2014 and will be conducted by GRI. The workplan contains a summary of existing data, a sampling and analysis plan (SAP), a site-specific Health and Safety Plan (HASP), and a Community Profile. Project scoping was conducted during a meeting on June 13, 2014 attended by representatives of Metalsa Structural Products, GRI, Enviroserv, Chemical Solutions, Inc, and DTSC. The PEA workplan will be implemented in general accordance with DTSC guidelines provided in the Preliminary Endangerment Assessment Guidance Manual (1999, Revised October 2013) and (USEPA's) "Sampling and Analysis Plan, Guidance and Template"(2004). 1.1 Scope and Objectives The scope of the PEA is to determine whether current or past management practices have resulted in the release or threatened release of hazardous substances which pose a threat to public health or the environment. Per the PEA Guidance Manual the specific objectives of the PEA include: 1163-3 2014 0617 PEAWP 3 1 G"