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1.0 INTRODUCTION AND SUMMARY 1.1 INTRODUCTION This document presents a Preliminary Endangerment Assessment (PEA) Work Plan for the proposed Lockeford Elementary School expansion site (the Site) at 19555 North Tully Road in the community of Lockeford, San Joaquin County, California, 95237. This PEA Work Plan is being submitted by URS Corporation (URS)under Work Order No. 1-501-1.0-104292-27, dated December 12, 2002, issued by the California Environmental Protection Agency(CalEPA),Department of Toxic Substances Control (DTSC) under Agreement No. 02-T2501. In order to comply with state requirements for new school construction projects that went into effect in January 2000, Lodi Unified School District (LUSD) requested DTSC's assistance in providing a PEA for the environmental review of the Site. The DTSC has agreed to provide the LUSD with a PEA for the Site under a grant funded by the United States Environmental Protection Agency (USEPA). DTSC requested URS to complete a PEA at the Site. A Phase I Environmental Site Assessment (ESA) report, dated September 24, 2002 for the Site, prepared by NOA Environmental (NOA), was submitted to LUSD. The information compiled in the Phase I ESA report was used as a basis for the site background review during the preparation of this PEA Work Plan. In December 2002, a site reconnaissance/scoping visit was performed by the URS Project Manager with the DTSC Project Manager to review the current Site conditions and potential sampling locations. The Site location is shown on Figure 1. This PEA Work Plan was prepared in accordance with the guidelines of the DTSC,as detailed in the PEA Guidance Manual (DTSC, 1994) and associated DTSC guidance documents. The scope of the PEA Work Plan was provided by the DTSC in the Work Order. A project scoping meeting was held with representatives of the DTSC and URS in November 2002 to discuss the schedule and scope of the PEA Work Plan. This PEA Work Plan is organized in accordance with the model work plan provided by DTSC, as follows. Section 1.0 presents an introduction and summary of site background information and planned field sampling and data collection activities presented in the Work Plan. Section 2.0 presents the overall objectives of the PEA process, and Section 3.0 presents a detailed discussion of site background research conducted in preparation of the Work Plan. The Field Sampling Plan (FSP), included as Section 4.0, presents a detailed discussion of planned field and laboratory data collection activities that will be conducted to evaluate environmental conditions at the Site. The planned Human Health and Ecological Screening Evaluation is described in Section 5.0, and the planned PEA Report preparation is addressed in Section 6.0. The proposed work schedule is included in Section 7.0, and references for this Work Plan are listed in Section 8.0. Tables and figures for the Work Plan follow the text. The Quality Assurance Project Plan (QAPP) found in Appendix A describes quality assurance (QA) and quality control (QC) measures to be used during project execution to provide an appropriate level of assurance that the data collected during the PEA meet project data quality objectives (DQOs) to support risk-based decisions regarding site acceptability for school use. A project Health and Safety Plan (HASP) is included as Appendix B. If additional characterization of the Site, above that set forth in this Work Plan, becomes necessary due to Page 1 PAPEA LockefordMork PlanU ockeford WP.doc