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PRELIMINARY ENVIRONMENTAL ASSESSMENT REPORT Pittman Elementary School Assessor Parcel Number (APN) 139-210-04 Stockton, San Joaquin County, California December 10, 2003 1.0 INTRODUCTION Condor Earth Technologies, Inc. (Condor) conducted a Preliminary Environmental Assessment (PEA) for the proposed Pittman Elementary School site located at the California State University — Stanislaus, Stockton Multi-Campus 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) The PEA was conducted at the request of Steve Breakfield, Facilities Planner of the Stockton Unified School District (District), pursuant to an Environmental Oversight Agreement (EOA) between the District and the California Environmental Protection Agency (Cal/EPA), Department of Toxic Substances Control (DTSC). The work described in this report was conducted in general accordance with the Preliminary Environmental Assessment Work Plan, prepared by Condor, dated April 21, 2003 and revised July 2, 2003. The Work Plan was developed using information contained in the DTSC Preliminary Endangerment Assessment Guidance Manual, dated January 1994 (Second Printing, June 1999); the Interim Guidance for Sampling Agricultural Soils (Second Revision), dated August 26, 2002; the Interim • Guidance for Evaluating Lead-Based Paint and Asbestos-Containing Materials at Proposed School Sites, dated July 23, 2001; the Advisory — Active Soil Gas Investigations, dated January 28, 2003; and comments from DTSC. The work plan was approved by DTSC in a letter dated July 28, 2003 from Javier Hinojosa. The primary objectives of the work described in this report were to evaluate potential contamination issues and contaminant exposure levels associated with historical land use practices, the site's position in a known oil and gas field, possible lead-based paint on the buildings at the site, and a leaking underground storage tank (UST) near the site. This report includes site background information, a description of the field sampling procedures and analytical methods, a description of the laboratory analytical results, summation of human health risks, conclusions, and recommendations. 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 historic Grant House with a small associated shed, a Pacific Gas & Electric (PG&E) electrical substation, a restroom facility, a sewer screening station, drug abusers' rehabilitation houses (rehab center), and a parking area. Seven residences are located in the northwestern portion of the site. A lawn-covered park area is located immediately east of the residences. A hydraulic elevator 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 • n �.a CONDOR