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1.0 Introduction IT Corporation (IT) was retained by Pacific Bell to execute a groundwater risk analysis and ' prepare a Site Closure Recommendation report for their facility located at 345 North San Joaquin Street in Stockton, California IT previously conducted soil and groundwater investigative activities at the facility, in an effort to assess necessity and/or the effectiveness of soil remediation activities Results of FT's investigation revealed v residual diesel concentrations in soil beneath the abandoned tank locations in the basement of the building and beneath the sidewalk area near former diesel underground storage tank (UST) locations The diesel impacted soils beneath the abandoned basement tanks could not be accessed for removal, however, residual diesel impacted soils were spot excavated during sidewalk area UST removal to the maximum extent practicable The following report discusses risk assessment procedures and recommends conditional site closure. 2.0 Site Description Pacific Bell facility UE042 is located at 345 North San Joaquin Street in downtown Stockton, California (Figure 1) The site (parcel No 139-140-01) lies approximately 1,000 feet east of McLeod Lake, which is the eastern end of the Port of Stockton slough The site is located in the Stockton 7 5-minute USGS topographic sheet and is located in Subsection D, Section 2, Township 2 North, Range 6 East of the Mt Diablo baseline and meridian The site lies at approximately 12 feet mean sea level and is essentially flat Ground elevations increase very little within several miles of the site Pacific Bell facility UE042 occupies one half a city block and is flanked by North San Joaquin Street, Lindsay Street, and Hunter Street (Figure 2) A large building occupies almost the entire site except for a rrucrowave tower in the rear of the building Occupying the same block are law offices and a car dealership The properties surrounding this block consist of a car dealership, commercial establishments, a bank, a park, county and federal buildings Several UST's have been identified near the site with the nearest one located at a distance of 300 feet MZ/0406-95/UST/95-0089 1