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1. INTRODUCTION AND BACKGROUND CRA Inc. (CRA) has been retained by the Tracy Unified School District (TUSD) to conduct a Preliminary Endangerment Assessment (PEA) for the proposed Gabriel Estates/George Kelly K-8 School Site located at the intersection of Mabel Josephine Drive and Veneto Lane in Tracy, California (See Figure 1). The Site consists of one parcel of land (APN 240-070-13) comprising approximately nine and one-half acres of land which in the past had been part of a much larger single farming unit. Prior to the A� stockpiling of excavated soil (described below), the site was essentially level and consisted of agricultural land. The Site is currently unoccupied and is vacant. Agricultural chemicals such as fertilizers, pesticides and herbicides have not been applied within the past five years. The last reported use of agricultural chemicals at the Site was over ten years ago. At that time, these chemicals were applied in accordance with manufacturer specifications by a trained and licensed applicator. To date, a Phase I Site Assessment has been the only environmentally related activity conducted for this Site. The findings of the Phase I Site Assessment indicated the possibility that agricultural chemical residues may exist within the Site soils. Additionally, the entire Site is covered with soils that were stockpiled on the Site. According to individuals knowledgeable with the Site, these stockpiled soils originated from the excavation of the adjacent residential development storm water retention basin which was constructed approximately two years ago. No other information regarding these soils is available. Prior to the construction of the school Site, these stockpiled soils will be removed and the Site will be restored to its natural elevation. As these soils came from the adjacent Site and historical land use in the area is similar (agricultural), there does not appear to be concerns regarding these soils other than application of agricultural chemicals as mentioned above. Based on these findings, the California Department of Toxic Substances Control (DTSC) is requiring a Preliminary Endangerment Assessment (PEA) for the Site. As part of the PEA process, TUSD has entered into an agreement with DTSC under the Voluntary Cleanup Program (VCP) to ensure proper and adequate remediation of the Site. DTSC will act as the oversight authority during the PEA process to maintain the integrity of the process. Based on the PEA guidance manual, Interim Guidelines for Sampling of Agricultural Soils (June 2000) and discussions with DTSC staff; Site Investigation (SI) activities directed towards characterization of the Site soils will be required. The following sections of this Workplan outline CRA's proposed Soil Investigation Program activities for the proposed Gabriel Estates/George Kelly School Site (Site). 091090-10(3) -1- CON ESTOGA-ROVERS&ASSOCIATES