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Kennedy/Jenks Consultants 1.0 INTRODUCTION On behalf of the City of Lodi, Kennedy/Jenks Consultants (Kennedy/Jenks) prepared this Soil Gas Survey Workplan (Workplan) to present the scope of work to be performed to conduct a limited soil gas survey at the Beckman Building property, located at 212 W. Pine Street in Lodi, California (Site). The objective of the soil gas survey is to gather data on the possible presence of perch loroethylene (PCE) within soils in the vicinity of and immediately underlying the Beckman Building. 1.1 Background Information The Beckman Building is located within the area of downtown Lodi identified 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 (TCE) 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 subsurface 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 lateral 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 oral history of the area, previous occupants of the Beckman Building may have used PCE as part of their operations, thereby potentially contributing to the presence of PCE in soil (and groundwater) in this area. 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 wishes to gather information on the lateral and vertical distribution of PCE within soils of the Beckman Building property to assess the possibility that the Beckman Building property is a source of PCE or other volatile organic compounds in the area. 2.0 SCOPE OF WORK To assist the City of Lodi with gathering this information, Kennedy/Jenks prepared the following scope of work for a soil gas survey to rapidly gather data on the presence of PCE within soils at the Beckman Building. The proposed scope of work to be conducted is defined as three separate tasks: 1)Pre-field activities, 2) Soil gas survey (field work) and 3) Reporting. Each of these tasks are discussed in detail below. 3/8, 8:38 AM 1 952704.01 g:l obs\952704.01\lodi.doc