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Treadwell&Rdlo north, and Commerce Street to the east. The Site is1 - p armed for re development as a hotel and conference center that may include upper-floor condominiums. Until March 2004, the Site was covered by several buildings with a walk-through interior. During March 2004, the buildings were demolished in preparation for redevelopment. Prior to the City's purchase of the property, the Site was operated by the Carando Machine Works as a machine shop. Buildings in the southern half of the Site were constructed between 1920 and 1950. Aerial photographs and Sanborn maps show a gas station pump and service station in the northwest area of the Site from at least 1950 until the late 1960s. The approximate locations of the former service station, underground storage tanks (USTs), and pump islands are shown on Figure 2. From the late 1960s on, the entire Site was occupied b buildings P Y g operated by Carando } Machine Works. Three USTs were present in the sidewalk adjacent to the Site until their removal in April 2004. 3.0 SOIL AND GROUNDWATER CHARACTERIZATION AND REMEDIATION i 3.1 Soil and Groundwater Conditions {� The Site is underlain by silts and clays with some shallow silty sand layers to at least 30-feet below ground surface (bgs). Although no monitoring wells are present at the Site, groundwater monitoring at adjacent and nearby sites indicates a northeasterly groundwater flow direction at the Site. Groundwater is generally encountered in wells near the Site at approximately 17 to 19 feet bgs. The groundwater flow direction at adjacent sites is consistently to the northeast i _ (AGE, 2003b, c) (Wallace, Kuhl &Associates, Inc., 2003). From 1994 to approximately 1997 4� there was a regional rise in groundwater of at least 10 feet recorded in nearby wells, and additional rise in groundwater elevation was reported to have occurred prior to 1994. The rise in groundwater after the fuel release at the Site (and documented at adjacent sites)has resulted in _ soil having a smear zone with significant TPH-g concentrations to at least 10 feet below the I water table (AGE, 2003b,c) (Wallace, Kuhl & Associates, 2003) (Treadwell &Rollo 2004c). 2 25970122.DGD 14 February 2005 I