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1.0 INTRODUCTION On behalf of PSC Environmental Services (PSC), ETIC Engineering, Inc. (ETIC) has prepared this soil and groundwater investigation work plan for the former Colombo/Toscana Bakery (Colombo/Toscana) located at 1444 South Lincoln Street in Stockton, California (the Site). This work plan has been prepared in accordance with the September 26, 2006 and January 8, 2007 letters from the Central Valley Regional Water Quality Control Board (CVRWQCB) (Appendix A). Colombo/Toscana operated two 4,000-gallon gasoline underground storage tank(UST) systems for fleet refueling at the Site. The gasoline UST systems were removed for permanent closure in February 1994, and soil samples collected from the former UST excavation contained elevated concentrations of petroleum hydrocarbons. Environmental investigations were performed at the Site from February 1996 to December 1997 to evaluate the degree and extent of contamination in soil and groundwater. Mr. Edward Overton currently owns the Site. The objective of the proposed subsurface investigation is to delineate the vertical and lateral extent of petroleum hydrocarbons in soil and shallow groundwater at the Site. ETIC will address this objective by performing the following activities: • Drill soil borings for further characterization of soil and groundwater conditions in the shallow aquifer; • Collect soil and groundwater samples for laboratory analyses; • Compile and evaluate laboratory analytical data; and • Prepare a written investigation report for PSC. 2.0 SITE BACKGROUND 2.1 DESCRIPTION OF SITE AND VICINITY The Site occupies approximately 0.9 acre of land in Stockton, California(Figure 1). The Site is located in Township 1 North, Range 6 East of the Mount Diablo Baseline and Meridian. The Site is located in an area occupied by commercial and industrial businesses. The Site is bordered to the north by a Texaco service station (now an Arco station), to the east by a vacant lot, to the south by a former Dolly Madison bakery site (1426 South Lincoln Street), and to the west by South Lincoln Street. Beyond South Lincoln Street to the west are a Chevron station and the City of Stockton Corporate Yard(Figure 2). The majority of the Site is occupied by a warehouse building (Figure 3). Adjacent to the western and northern sides of the building is an asphalt-paved parking area and driveway. 1