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i hydrocarbons in the gasoline range (TPH-g) were detected in MW-1. No petroleum hydrocarbons in excess of detection limits were found in the groundwater from any other wells. Weston performed quarterly monitoring of the groundwater monitoring wells for the second and third quarters of 1992 and the fust quarter of 1993. Benzene, L toluene, xylenes, and TPH-g were detected in only MW=1 during these sampling events. 2.0 SITE DESCRIPTION A. Vicinity Description The Stockton Service Center is approximately 1,000 feet south of the Port of Stockton and the Stockton Deep Water Channel, at the intersection of West Main Street and Los Angeles Avenue as shown on Figure 2-1. The Atchison, Topeka, and Sante Fe Railroad is approximately one half mile south of the site and the San Joaquin L, River is approximately one mile southeast of the site. 'J The Stockton Service Center contains several buildings used for offices, garages, and storage, and two above ground storage tanks used for refueling vehicles. LThe adjacent streets, onsite building locations, former UST locations, and known subsurface utility locations are shown on the site map on Figure 2-2. B. Previous Investigations The previous investigations at the site include UST removals and soil and i groundwater assessments conducted between July 1987 and April 1993. These investigations have been described in Section 1D of this work plan. The previous sampling locations are shown on Figure 2-3. 1 r M The soil and groundwater assessment performed by Kleu>Lfe de in May and October 1989 detected petroleum hydrocarbons in the soil and groundwater. The results of this investigation are summarized in Table 2-1. The Meinfelder assessment report is included as Appendix A. I i 93822 East Bay Municipal Utility District 40429200nvp 3 Work Plan-Stockton Service Center