ARCHIVED REPORTS_SITE INVESTIGATION REPORT

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i 1.0 INTRODUCTION Conestoga-Rovers & Associates (CRA) prepared this report on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) to document the investigation activities performed at the site located at 3515 Navy Drive, Stockton, California. CRA followed the scope of work described in our May 17,2010 Air Sparge Well and Soil Vapor Extraction Well Installation Work Plan and July 1, 2010 letter to the Central Valley Regional Water Quality Control Board (RWQCB). The scope of work was approved in the RWQCB's August 17,2010 letter to Shell. The Shell Stockton Terminal is located on Rough and Ready Island along Navy Drive in Stockton, California (Figure 1). The eastern portion of the island is bordered by the San Joaquin River on the north and Burns Cutoff on the south. This section of the San Joaquin River channel is used for access to the Port of Stockton,located 1 mile to the east of the site. The former US Naval Reservation occupied three quarters of the island and borders the western side of the site. The former Tosco Bulk Terminal is located east of the facility. A small parcel of vacant land lies north of the Shell Terminal. The Shell facility began operating in 1940. The site is used to store petroleum fuel ' products in above ground tanks. Fuel products are received through the Shell Pipeline Corporation and additives are received by tanker truck. The products stored at the site include gasoline (regular and premium), diesel, ethanol, slop, and transmix. The tanks range in capacity from 5,450 to 24,000 barrels. The fuel products are distributed by tanker trucks, which are filled at a two-bay loading rack. The tank and loading rack locations are shown on Figure 2. A summary of previous work performed at the site and additional background information is contained in Appendix A. I CONESTOGA-ROVERS&ASSOCIATES 241729(31)