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