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r • • 1.0 INTRODUCTION As requested by Sedgwick,Detert, Moran &Arnold, Montgomery Watson has prepared this work plan for a soil vapor survey at 610 West Lodi Avenue in Lodi, California (the "Site"). The Site is rcurrently owned by American Stores Properties,Inc. (ASPI), and Lucky Stores, Inc., an affiliated Operating Division of ASPI, operates Lucky Store No. 110-310 at the Site. Additional detail on parcel boundaries and timing of acquisitions has previously been provided to the California Environmental Protection Agency (Cal/EPA) Department of Toxic Substances Control (DTSC). r ASPI has been directed by the DTSC to investigate the Site for volatile organic compounds (VOC). The DTSC is requiring owners of properties identified during the Potential Responsible Parties r Search and Source Investigations for the Lodi Groundwater Site (NERI 1996) to investigate soil contamination on their properties. Property owners are not being required to investigate groundwater conditions. The Lodi Groundwater Site encompasses approximately 600 acres of the central business area of the City of Lodi (Figure 1). VOCs, particularly tetrachloroethene (PCE) and trichloroethene (TCE), have been detected in the groundwater that is the primary source of drinking water to the r residents of the City of Lodi. These detections have forced the City to remove three of twenty four water supply wells from service since 1989 (NERI 1996). The DTSC, the California Regional Water Quality Control Board, Central Valley Region (RWQCB), and the City of Lodi have rconducted ongoing investigations to determine extent of contamination and to identify all potential parties responsible for the release of VOCs to the soil and groundwater in Lodi. The VOC contamination in the soil and groundwater beneath Lodi is derived from two principal r sources: industrial and commercial users have disposed of solvents on the surface and solvents have accumulated in and leaked from sewer lines downstream of facilities that used solvents. PCE r has been found at elevated concentrations in samples of soil gas collected along the path of sewer lines carrying VOC contaminated effluent. VOCs are coincident with cracks or joints in sewer pipe and are thought to leach directly through the walls of the sewer pipe. Because PCE is commonly iused as dry cleaning fluid by commercial laundries and dry cleaners, the DTSC has targeted dry cleaners that operate currently or that have operated historically as potentially responsible parties. rIn their letter to ASPI, dated March 5, 1996, the DTSC suggests that three dry cleaning facilities were formerly located on the ASPI property: Swanson's Cleaners, Norge Laundry and Dry rCleaning (Norge) and Deluxe Dry Cleaners (Deluxe). 1