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Stockton 99 Speedway Preliminary Endangerment Assessment Workplan - April 12,2007 1.0 INTRODUCTION Introduction 1.1 i ctron This document presents a Preliminary Endangerment Assessment (PEA) Workplan (Workplan) for the Stockton 99 Speedway (the Site) located in Stockton, California (Figure 1). Legacy Development (Legacy) and the property owners (Proponents) entered into a Voluntary Cleanup Agreement (VCA) with the California Department of Toxic Substance Control (DTSC) to perform a PEA. This Workplan was prepared in accordance with the DTSC guidance manual for evaluating hazardous substance release sites, title: "Preliminary Endangerment Assessment Guidance Manual," State of California, Environmental { Protection Agency, Department of Toxic Substance Control (January 1994). This Workplan was prepared by The Source Group, Inc. (SGI) on behalf of Legacy for submittal to the DTSC. 1.2 PEA Workplan Objectives The objectives of the PEA are to fill in gaps within the existing data set, expand the environmental data set (Appendix A), and to further evaluate the presence and extent of soil containing detectable levels of metals, petroleum hydrocarbons, volatile organic compounds (VOCs), and organochlorine pesticides at the Site. This document contains a description of the tasks to be performed, information or data needed for each task, and the deliverables that will be submitted to the DTSC following implementation of this Workplan. 1.3 Organization of the Workplan The remainder of this Workplan is organized into the following sections: • Section 2, Project Scoping. Describes program goals and contains background information on the Site; • Section 3, Preliminary Conceptual Site Model. Presents a conceptual site model of the Site; • Section 4, Field Sampling Plan. Presents the field work objectives and plan for additional sampling at the Site; • Section 5, Data Management and Reporting. Contains information on data objectives and data handling procedures; • Section 6, Health and Safety. Contains information on Health and Safety procedures to be used while performing work at the Site; . • Section 7, Preliminary Endangerment Assessment Schedule. Presents the PEA schedule and key assumptions used as a basis for the schedule; and Pea wono ,.Finai.eoc 1-1 The Source Group,Inc.