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LFR Inc. 1.0 INTRODUCTION This Proposed Closure Plan for the Phase II (Soil-Vapor Extraction) and Phase IV (Air and Ozone Sparging) Interim Remedial Actions (IRA) has been prepared by LFR Inc. (LFR) on behalf of the Lincoln Center Environmental Remediation Trust for assessing the closure of the two referenced remediation systems at Lincoln Center, located in Stockton, California("the Site"; Figure 1). The Phase II and Phase IV IRA systems were installed in 1999 and 2006, respectively, pursuant to the "Amended First Final Consent Decree Order, Judgment and Reference to Special Master," filed with the Court on June 4, 1999 ("the Amended First Final Consent Decree"), and in accordance with existing regulations, such as the National Contingency Plan and the Comprehensive Environmental Response, Compensation, and Liability Act of 1980. The "Site" (as defined by Section III.O of the Amended First Final Consent Decree) is defined as "Lincoln Center, located in an unincorporated area of San Joaquin County near the City of Stockton, California, and the surrounding area where Hazardous Substances have been released, have come to be located, or threaten to be released from the Settling Dry Cleaning Defendants' facilities at Lincoln Center." Tetrachloroethylene (PCE), trichloroethylene (TCE), 1,2-dichloroethylene (1,2-DCE), and vinyl chloride are the primary constituents of concern detected in the subsurface at and downgradient from the Site, and are referred to as "Hazardous Substances" in this report. 1.1 Previous and Ongoing IRAs Proactive IRAs have been implemented at the Site to reduce the concentrations of Hazardous Substances found in vadose-zone soils and groundwater beneath the Site. Five phases of IRAs have been implemented (Figure 2): • Phase I implemented in 1998: Operation of the A-zone groundwater extraction system (GWES) along the downgradient boundary of Lincoln Center (along Pacific Avenue), comprising 17 groundwater extraction wells (wells GWE-1 through GWE-17). In addition, the implementation of the Phase I IRA included the installation of a groundwater treatment system (GWTS) to treat extracted groundwater. Together, the GWES and GWTS are referred to as the groundwater extraction and treatment system (GWETS). • Phase II implemented in 1999: Operation of the soil-vapor extraction (SVE) and treatment system (SVETS) at Lincoln Center. The SVETS comprises 35 SVE wells located at Lincoln Center (SVE-1 thorough SVE-35; Figure 3). • Phase III implemented in 2002: Operation of the expanded GWETS including additional B-zone groundwater extraction wells, installed along the downgradient boundary of Lincoln Center, and an additional A- and B-zone groundwater p1m-dosme-PhII IV-IRA-Aug09-06750.dm:deh Page I