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ww � 145 Slash ShmoM Crarecom EVECKGROUND 2. BACKGROUND This section presents a summary of background information for the Site, including location and description, environmental seeing, historical use, and previous investigations and results. 2.1 SITE LOCATION AND DESCRIPTION A Site location map is provided as Figure 2-1. The HSA building occupies the majority of the city block bounded by Marke(, Washington, San Joaquin and Sutter Sheets in downtown Stockton, California. A Fanner gasoline service station (Site) was located at the corner of Washington and Sutter lateral. The Site address is 145 South Sutter Street (Latitude 370 5705.411 North, Longitude 1210 17' 08.21' West). The Site lice as an approximate elevation of 16 f above moan .sea level (MSL) in the imrthem Nation of San Joaquin Valley. McLeod Lake is located I,700 feet northwest of the site; the lake Flows to the Stockton Deep Water Channel and the San Joaquin River. The site is located in a densely developed urban area in downtown Stockton. The site is bounded to the west and north by the HSA building, to the south by Washington Street and a parking lot beneath Ilighway 4, and m the east by Sutter Strestand a rcsumxm. Prior to redevelopment of the Site and construction of the IISA building, a gasoline station was located at the southeast corner ofthe Site at Elie intersection of Fist Washington Street and South Sutter Street. All known USTs associated with the former gasoline station were removed prior to redevelopment of the Site. In April and May 1988, the following nine USTs were removed in the vicinity of a former gasoline service station which operated at the canter of Sutter and Washington Steven. 1) Two 10,000 gallon unleaded gasoline UST; 2) One 5,000 Plan super unleaded gasoline DST' 3) Two 550 gallon leaded gasoline USTs 4) One 500 gallon used oil UST