SITE INFORMATION AND CORRESPONDENCE_1998-2000

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CALIFORNIA REGIOL WATER QUALITY CONTROL BOAR , CallEPA CENTRAL VALLEY REGION Y�o 3443 Routier Road,Suite A Sacramento,CA 95827.3003 Phone(916)255-3000 FAX(916)255-3015 Pete Wilson,Governor 25 March 1998 Ms. Peggy Hams, Chief Standardized Permitting Section Hazardous Waste Management Program 400 P Street,4th Floor P.O. Box 806 Sacramento, CA 95812-0806 REQUEST FOR EXCLUSION FROMHSC SECTION 25207 REQUIREMENTS FOR THE LINCOLN VILLAGE CENTER PHASE IINTERIMREMEDIAL ACTIONDETAILED PLAN, SAN JOAQUIN COUNTY We are writing this in response to Mr. Watson Gin's 20 March 1998 letter to Mr. Robert C. Thompson. The Board is overseeing the cleanup of soil and groundwater contamination at the Lincoln Village Center in the unincorporated area of San Joaquin County near the City of Stockton. Soil and groundwater contamination by hazardous substances (PCE, TCE and 1,2-DCE)was caused by past activities of three dry cleaning operations, known collectively as the Settling Dry Cleaning Defendants (SDCDs). In February 1998,the Board approved a Phase IInterim Remedial Action (IRA) Detailed Plan for onsite cleanup of shallow groundwater contamination. The Phase I IRA was prepared pursuant to the"Permanent Injunction Governing Investigation,Monitoring, and Testing of Hazardous Substances Contamination at and Emanating From Lincoln Center and Order of Reference to Special Master," filed with the United States District Court,Eastern District of California(the Court), on August 16, 1993, in the case Lincoln Properties Ltd v Norm Higgins et al., Case No CV-S-91-760-DFL- GGH and the "First Final Consent Decree Order, Judgment and Reference Special Master,"filed with the Court on January 18, 1996. The Phase I IRA Detailed Plan constitutes a removal action workplan as defined in Health and Safety Code (HSC) Section 25323.1. The Phase I IRA Detailed Plan provides a detailed discussion of the nature and extent of onsite soil and groundwater contamination, and evaluates a number of groundwater control and treatment alternatives and their associated costs. The remediation measures selected in the Phase I IRA Detailed Plan include installing 17 groundwater extraction wells along the downgradient property boundary and treating the extracted water onsite using air stripping and activated carbon. The Phase I IRA Detailed Plan contains detailed engineering plans of the design and installation of the shallow groundwater extraction system, conveyance piping and onsite treatment system. Onsite contaminated groundwater has been sufficiently defined to demonstrate that the proposed interim remediation measures will be effective and are necessary to control the migration in the shallowest Recycled Paper Our mission is to preserve and enhance the quality of California's water resources,and ensure their proper allocation and efficient use for the benefit of present and future generations.