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Kennedy,,Jenks Consultants PRfWLEGED & CONFIDENTIAL 1.0 INTRODUCTION On behalf of the City of Lodi (City), Kennedy/Jenks Consultants (Kennedy/Jenks) conducted a limited soil gas survey at the Beckman Building property, located at 212 W. Pine Street in Lodi, California (Site) (Figure 1). The purpose of the soil gas survey was to evaluate if the Site is a source of perch Ioroethylene (PCE) to soils in the vicinity of and immediately underlying the Beckman Building. This Soil Gas Survey Report (Report) presents the results of the soil gas survey and a brief discussion addressing the presence of PCE'in the soils in the vicinity of the Site. This Report additionally presents maps depicting soil gas sampling locations and interpretative PCE isoconcentration contour lines at two depths based on soil gas analytical data. 1.1 Background Information . The Beckman Building is located within the area of downtown Lodi identified by regulatory agencies as the Lodi Groundwater Site. The soils and groundwater within the Lodi Groundwater Site have been impacted by volatile organic compounds (VOCs) such as PCE, trichloroethylene (T CE) and related compounds The location of the Beckman Building is in close proximity to one of the source areas of PCE within the Lodi Groundwater Site. Limited subsurrace investigations have been conducted in the vicinity of the Beckman Building by various parties. The Department of Toxic Substances Control (DTSC) detected the presence of PCE in soil gas on the property just south of the Beckman Building, in sewer samples collected from the sewer main in the alley behind the Beckman Building and in a groundwater reconnaissance sample collected in the area. PCE was also detected in soil samples collected by the City of Lodi from the Beckman Building property. According to local oral history (Mr. Jack Alquist, 27 November 1995) of the area, previous occupants of the Beckman Building may have used PCE as part of their operations. The City of Lodi is currently leasing the Beckman Building to house some of its administration operations and is considering purchasing the building. Because of the possibility that previous operations within the Beckman Building may have contributed to the presence of PCE in soils (and groundwater) within the Lodi Groundwater Site, the City of Lodi wanted to gather information on the possible presence of PCE within soils of the Heckman Building property to assess the potential that the Beckman Building property is a source of PCE or other VOCs in the area. As a first step in assessing the possibility of the Beckman Building site as a potential source of PCE in the area, Kleinfelder, on behalf of the City of Lodi Public Works Department, collected soil samples from approximately 5 feet below ground surface (bgs) by hand augering. The soil samples were submitted by Kleinfelder for laboratory analysis for PCE. PCE was detected in soils collected from each sampling location. The sampling 4v29196 9;30 AM 1 952704.01 g;tjaos11995L952704.C1 UOC�-r,7 CCac