SITE INFORMATION AND CORRESPONDENCE

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t.'Sent By,,..BASELINE; 510' 420 1707; Nov-9.�99i1 6:25; Page 9129 BACKGROUND Property Owners and Land Uses A brief description of past and current propexty owners, leases, land uses, types and years of operation of businesses is given below and identified in Figure 3. See the Phase 1 assessment and Versar-McLarenlHart(1996), and the Phare Ii assessment (Black& Veatch, 1998x) for a detailed description. Previous Property Owners and Lard Uses The historical chain of title for the property included ownership by members of the Weber family (Black & Veatch, 1998x). The predominant historic land use has been industrial and commercial. Historic aerial photographs from the years 1953, 1964, 1970, 1979, and 1996 and Sanbom Fire Insurance Maps from the years 1895, 1917, 1950,and 1972 indicated the presence of freight sheds and transportation loading terminals on the northern and southern,portion of Weber Block, and an open Stockton Channel extending across the center of the site to El Dor:*do Street priot to 1950. By the early 1950s,the Stockton Channel was covered by a parking lot supported on treated wood piles (Black & Veatch, 1998a). a Shell Oil Company began leasing a portion of the property in 1955 from C.M. Weber Enterprises Inc. and operated a gasoline service station, with underground storage tanks (U,M), on the northeastern portion of the site from approximately 1955 to the early 1980s(Leedshill-Herkenhoff, Inc,, 1990, as cited in Black& Veatch, 1998a). This portion of the property was later occupied by the Bridgestone Tire and Auto Repair facility. Gasoline USTs associated with this former land use were removed in 1981 and a waste oil UST was removed in 1991 (Black& Vcatch, 1998a). The remainder of the site was used for parking at that time. A soil vapor extraction system was operated in the northeastern portion of the site beginning in 1992 to remediate residual petroleum hydrocarbons from soil in the area of the former USTs located on the property. Soil vapor extraction was performed continuously until 1996. A groundwater extraction system was operated from 1993 to 1995 to assist in controlling migration of petroleum . compounds in groundwater, and to enhance soil vapor extraction. The soil vapor system-was also augmented in 1994. by a groundwater oxygenator system(Black&Veutch, 1998a). (Results of soil and groundwater sampling are discussed under the Summary of Sampling Activities and Results Section below). Current Property Owner and Land Uses The City of Stockton is the current owner of Weber Block.The site is entirely capped with asphaltic . concrete,vacant,and is surrounded by a chain link fence.The site is placarded as no trespassing, no . dumping,and no parking. The property is no longer used as a parking lot, as the piers upon which the parking lot rest are failing(Siegfried Engineering, 1995). The paving on the site was in moderate to poor condition with some sink holes identified in areas of the site, Drainage grates were observed on the portion of the property supported by piles. The soil vapor and groundwater extraction system is non-operational, but is still located on-site(Black &Veatch, 1998a). 4 97389stk.pau.wpd 11/9199 3