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PRELIMINARY ENVIRONMENTAL ASSESSMENT WORK PLAN Pittman Elementary School Assessor Parcel Number (APN) 139-210-04 Stockton Unified School District Stockton, San Joaquin County, California April 21,2003 Revised July 2,2003 1.0 INTRODUCTION This is a work plan for conducting a Preliminary Environmental Assessment (PEA) at the proposed Pittman and Kohl Elementary Schools site (site) located at 510 East Magnolia Street in Stockton, San Joaquin County, California. This site is located on an approximately 14.5-acre portion of the parcel designated by Assessor Parcel Number (APN) 139-210-04 (Figures 1 and 2, Appendix A). Condor Earth Technologies, Inc. (Condor) prepared this work plan at the request of Mr. Steve Breakfield of the Stockton Unified School District(District), Stockton, California. The objective of the work described in this work plan is to evaluate potential contamination issues and contaminant exposure levels associated with historical land use practices at the site. This work plan was developed using information contained in the California Environmental Protection Agency Department of Toxic Substances Control (DTSC) Preliminary Endangerment Assessment Guidance Manual, dated January 1994 (Second Printing, June 1999) and the DTSC Interim Guidance for Evaluating Lead-Based Paint and Asbestos-Containing Materials at Proposed School Sites, dated July 23, 2001. This work plan includes site background information, health and safety requirements, and descriptions of the proposed fieldwork and laboratory analyses. 2.0 SITE BACKGROUND The 14.5-acre site is located along the southern boundary of APN 139-210-04, immediately south of the _ California State University—Stanislaus, Stockton campus. The parcel is owned by the State of California and managed by Grupe Commercial Company. The southern portion of the site is the location of a warehouse, a transportation building, the historical Grant House with a small associated shed, a Pacific Gas &Electric (PG&E) electrical substation, a restroom facility, a sewer screening station, a drug abuse recovery house, and a parking area. Five residences are located in the northwestern portion of the site. A lawn-covered park area is located immediately east of the residences. A dirt-surface athletic track is located northeast of the site, enclosing another lawn area. A hydraulic elevator that may have had hydraulic oil containing associated polychlorinated biphenyls (PCBs) is located inside the transportation building on the site. Lead-based paint and asbestos may be associated with the structures located on site. Research into the site history revealed that APN 139-210-04 was historically used for institutional purposes as a state hospital and a developmental center.Additionally, gas field maps indicate that the site is located within the Stockton Gas Field with several plugged and abandoned gas wells located in the vicinity of the site. Methane gas may be present in the site soils in association with the gas field. Condor reviewed five aerial photographs dated 1938, 1952, 1963, 1975, and 1983 of the site and surrounding area at the San Joaquin County Surveyor's Office. Aerial photographs indicate that land use in Stockton in the vicinity of the site has been urban since at least 1938. Two large structures were originally located on the northeast portion of the site and were replaced by the athletic track between ow CONDOR