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SUPPLEMENTAL SITE INVESTIGATION SCOPING DOCUMENT Pittman Elementary School Assessor Parcel Number(APN) 139-210-04 Stockton, San Joaquin County, California January 23, 2004 1.0 INTRODUCTION This is a scoping document for conducting a Supplemental Site Investigation (SSI) at the proposed Pittman Elementary School site located at the California State University — Stanislaus, Stockton Multi- Campus in Stockton, San Joaquin County, California (site). 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 Teolmologies, Inc. (Condor) prepared this scoping document at the request of Steve Breakfield, Facilities Planner for Stockton Unified School District (District), pursuant to a Voluntary Cleanup Agreement (VCA) between the District and the California Environmental Protection Agency(Cal/EPA), Department of Toxic Substances Control (DTSC). l The objective of the work described in this scoping document is to further evaluate the contamination issues identified at the site during the Preliminary Environmental Assessment (PEA) and to define the extent of activities needed for a future Removal Action Workplan. This scoping document includes site background information and descriptions of the proposed fieldwork and laboratory analyses. 1.1 SUPPLEMENTAL SITE INVESTIGATION OBJECTIVES During the completion of the PEA for the site, contamination with associated human health risks was �i identified at various areas of the site. The objective of the SSI is to further evaluate the extent of soil contamination at the site in order to determine what removal actions are necessary. The areas of concern to be further investigated include: • Residual pesticides in the lawn area soil • Lead-contaminated soil identified in the structure driplines of several site buildings •. Soil gas anomaly of 1,3-butadiene at the northeast boundary of the site 1.2 SCOPE OF WORK The proposed scope of work includes the collection of additional soil samples, a soil gas investigation, laboratory analyses, and reporting. Within the lawn area, soil samples will be collected around two locations with high pesticide concentrations. Around the buildings, soil samples will be collected around 11 locations with high lead concentrations [above 200 milligrams per kilogram (mg/kg)]. A soil gas investigation will be conducted around one location with anomalous 1,3-butadiene soil gas results at the northeast comer of the site. 2.0 SUMMARY OF SITE BACKGROUND AND PREVIOUS SITE ACTIONS 2.1 SITE IIISTORY AND DESCRIPTION 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 �I iV. /� CONDOR