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Appendix A ' Site Background Information SUTTER OFFICE CENTER 242 North Sutter Street, Stockton, California SITE LOCATION ' The site is located in a commercial area of low topographic relief in central Stockton, California There is one multi-story building (242 North Sutter Street) occupied by multiple businesses on the ' western portion of the site, the remaining portion consists of a paved parking lot Based on the map Lanes of Equal Depth to Groundwater Sprang 1999, published by the San Joaquin ' County Flood Control District and Water Conservation District(FCD&WCD), the estimated depth to ground water at the site is 30 feet bsg The map Lanes of Equal Elevation of Groundwater Sprang 1998(FCD&WCD)depicts the regional ground water flow direction toward the northwest and west ' Review of previous ground water monitoring at the site and historical depth to ground water maps (FCD&WCD) dating back to 1971 suggests that ground water depth near the site has fluctuated between 50 feet bsg and 60 feet bsg UNDERGROUND STORAGE TANK REMOVAL An unnamed service station operated at the site from the 1940s until the 1960s Reportedly, four underground storage tanks (USTs) were filled with sand and abandoned in place in the late 1960s ' A Standard Oil Service Station operated at the site from the 1960s until 1980 Subsequently, the USTs associated with this fuel system were removed The location of the former USTs during this ' period is uncertain, but is believed to be at the northeast corner of the site A site historical review of City of Stockton street directory records, San Joaquin County Assessors ' Office indicated that a Chevron gasoline service and filling; station operated at the site under the assumed address of 448 East Miner Avenue (242 North Sutter Street) from 1935 until 1941 A cab car service operated at the same assumed address of 448 East Miner Avenue from 1942 until 1958 From 1967 to 1980,a Standard Service Station operated at the site under the assumed address of 434 East Miner Avenue The property was also occupied by the Continental American Bus Lines depot from 1950 until the late 1960s The operation of four 500-gallon gasoline and/or fuel USTs ended in 1960, at which time the USTs were reportedly closed in place The Chevron dispenser for this tank set was located at the northeast corner of the site Neither UST decommissioning was veiified with soil sample collection Advanced GeoEnvironmental,Inc