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' I I 1TreadwelOW10 2.0 SITE DESCRIPTION i i The Site is part of the Banner Island Redevelopment Project, which includes the area north of the I Stockton Channel bounded by North Lincoln Street to the west, West Fremont Street to the north, and Commerce Street to the east i Until March 2004, the Site was covered by several buildings with awalk-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 `I the former service station, USTs, and pump islands are shown on Figure 2 From the late 1960s on, the entire Site has been occupied by buildings operated by Carando Machine Works At the start of 2004, all buildings at the site were demolished and removed In April 2004, three ' USTs present in the sidewalk adjacent to the Site were removed During the UST removal, petroleum hydrocarbon impacted soil was excavated from below the UST and former pump island locations, and contaminated groundwater was pumped from the site The impacted soil and groundwater was disposed of off-site (Treadwell &Rollo 2004b) The previous soil and groundwater characterization and remediation work is summarized in Section 3 0 ' 3.0 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 (AGE, 2003b, c) (Wallace, Kuhl & Associates, Inc , 2003) From 1994 to approximately 1997 1 25971024 DGD 2 7 June 2005