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�, 1 .0 Introduction Black & Veatch Special Projects Corp. (Black & Veatch) was retained by the East Bay Municipal Utility District (District) on June 24, 1993, to perform an LP additional site assessment, groundwater monitoring, and remediation services at the District's Stockton Service Center (Stockton site). Previous investigations had indicated the presence of a petroleum hydrocarbon groundwater plume at the site LO caused by leaking underground storage tanks (USTs). A work plan for additional investigation and quarterly monitoring was prepared by Black & Veatch and approved by the San Joaquin County Public Health Services Environmental Health Division (SJCPHS), the lead agency for the site. Black & Veatch performed an additional assessment, implemented a quarterly groundwater r0 monitoring program, and developed a feasibility study to identify and evaluate remedial alternatives for the site. The District selected active bioremediation as the preferred alternative and Black & Veatch developed a draft corrective action plan (CAP). The Central Valley Regional Water Quality Control Board(RWQCB) issued a general permit for the remediation in May 1995. At this time, the District decided to pursue passive bioremediation instead of the proposed active bioremediation. 16- This decision, based on several quarters of groundwater monitoring data and recent outcomes of UST studies, was approved by the SJCPHS. The District submitted an amendment to the CAP to the SJCPHS in March 1996 to document this alternative remedial action. A list of the documents prepared for this site and a summary of site activities are included in Appendix A. The District has no plans to sell the Stockton Service Center property at any time. The site will be a District owned maintenance center as long as the aqueducts that it serves are in use. Based on the investigations and studies performed at the site, the Stockton Service Center is a low risk site and closure is warranted. The rationale for closure is presented in this report. 1 .1 Site Location t w- The Stockton Service Center is at 1804 West Main Street, at the southwestern corner of the intersection of West Main Street and Los Angeles Avenue in Stockton, I� California (Figure 1). The site is approximately 1,000 feet south of the Port of Stockton and the Stockton Deep Water Channel. 9687 East Bay Municipal Utility District 40429700.fcr 1 Final Closure Report 1..