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2.0 BACKGROUND Lir 2.9 Location Weber Block is bounded by Weber Avenue to the south, Center Street to the west, Channel Street to the north, and El Dorado Street to the east (refer to Figure 2-1). The Stockton Deep Water Channel terminates under the site. The parking lot on the site is supported by piers above the channel. Surrounding areas include the Stockton Deep Water Channel and a former ARCO service station to the west. The street address of the former Shell service station is 141 North El Dorado Street, Stockton, California. The geographic coordinates of the site are: 37 57' 14" N latitude and 121 17' 25" W longitude. The site currently occupies approximately 2 acres in a commercial and light industrial area. The site is bordered on the north by the state building, on the west by the Stockton Deep Water Channel and former ARCO service station, on the south by an above ground parking lot, and on the east by the abandoned Hotel Stockton and former Good Year tire and auto repair facility. The specific location of the Weber Block site is shown in Figure 2-2. 2.2 Site Description The site currently consists of an abandoned automotive repair building, a closed soil vapor extraction and groundwater extraction system, and an asphalt paved parking lot. The parking lot, supported by piers, lies along the Stockton Channel. The hydrogeology from previous reports for investigations conducted for the former Shell service station indicates that groundwater was encountered at a depth of approximately 20 feet below ground surface (bgs) in April 1997. The direction of groundwater flow was reportedly to the east/northeast (Enviros, 1997). 2.3 Operational History Weber Block is currently owned by C.M. Weber Enterprise, Inc. The historical chain of title includes ownership by members of the Weber family dating back to 1879. Previous ownership of the parcel also included the City of Stockton. The City of Stockton is currently leasing the property with a purchase option (Nationwide Environmental Title Research, 1997). Shell Oil Company began leasing the property in 1955 and operated a gasoline service station. Observations made by Versar and McLaren Hart during their review of historical Sanborn maps and aerial photographs are summarized below (Versar and Mclaren Hart, 1996). The complete descriptions are in Appendix F. Figure 2-2 outlines the areas of the former land uses on Weber Block. Historical Sanborn Fire Insurance Maps dated 1895, 1917, and 1950 indicate the presence of freight sheds and transportation loading terminals on the northern and southern portions of Weber Block, and an open Stockton Channel extending across the center of the site to El Dorado Street. 0362 WEBER BLOCK (Area 9) Sampling and Analysis Plan 0 Page 3