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Stockton 99 Speedway Quality Assurance Project Plan April 12,2047 1.0 INTRODUCTION 1.1 Introduction This Quality Assurance Project Plan (QAPP) was prepared by The Source Group, Inc (SGI) for the Preliminary Endangerment Assessment (PEA) at the Stockton 99 Speedway (the Site) in Stockton, California (Figure 1). This QAPP was prepared in response to quality assurance and quality control (QA/QC) requirements outlined in Section 2.4.3 of the California Department of Toxic Substance Control (DTSC) guidance manual for evaluating hazardous substance release sites, title: "Preliminary Endangerment Assessment Guidance Manual" (January 1994). This QAPP is designed to address project organization and responsibilities with respect to the PEA and to provide data quality objectives and quality control procedures for sampling and analysis. 1.2 Project Background The Site is located in an area of mixed residential and commercial use. According to information contained in a Phase I Environmental Site Assessment (Phase I ESA, Kleinfelder 2005) completed by Kleinfelder, the Stockton 99 Speedway was built in 1947. Prior to that time, the land was believed to be in agricultural use. The Site currently contains a %/ mile paved racetrack, bleachers, storage sheds, concession stands, restrooms, and mobile home and dirt parking areas (Figure 2). Improvements include two domestic water supply wells, power lines, access roads, approximately five dry wells, pad- and pole-mounted transformers, utility vaults, and subsurface drains (Kleinfelder 2005). Previous environmental assessments have identified the presence of arsenic, cadmium, lead, organochlorine pesticides, and petroleum hydrocarbons (TPH) in soil underlying the Site. Proposed activities include analyzing historical data collected from the Site, performing fieldwork to provide additional data for analysis, and implementing an appropriate remedial action based on an evaluation of the data and feasible remedial alternatives. 1.3 Preliminary Endangerment Assessment Workplan and QAPP Objectives Refer to the PEA Workplan for a more complete description of the overall project objectives. The objective of this QAPP is to describe a procedure for validation of project data and, upon implementation, yield data that are suitable for use in characterizing the Site and evaluating appropriate remedial alternatives. This document serves as guidance for using historic data and obtaining additional data that will be used in future phases of the project. Soil sampling at the Site will be conducted according to the procedures outlined in Section 4 (Field Sampling Plan) of the PEA Workplan and according to the procedures outlined in this document. QuWV_Assurance_Projed_PIan.Final.doc The Source Group,Inc.