SITE INFORMATION AND CORRESPONDENCE_2006-2007

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GLFRENVIRONMENTAL MANAGEMENT&CONSULTING ENGINEERING September 28, 2007 001-06750-07401 Mark A. Adams, P.G., Trustee Lincoln Center Environmental Remediation Trust Point Environmental 137 Park Place Richmond, California 94801 Subject: Request for Abandonment of Soil-Vapor Extraction Well SVE-004, Lincoln Center, Stockton, California Dear Mr. Adams: On behalf of the Lincoln Center Environmental Remediation Trust ("the Trust"), LFR Inc. (LFR) is requesting the Regional Water Quality Control Board's (RWQCB's) concurrence with the subject request. This letter was prepared at the request of Ms. Marie McCrink of the RWQCB during a site visit on August 7, 2007, which was attended by Ms. McCrink of the RWQCB and Don Bradshaw and Lucas Goldstein of LFR. As we discussed during this visit, the property owner has notified the Trust and is in the process of expanding the building located at Lincoln Center in the northwestern corner of the property (see attached figure) on the northern side of Benjamin Holt Drive. The footprint of the building and sidewalks would be expanded over this well location. This proposed expansion would require the abandonment of soil-vapor extraction (SVE) well SVE-004 located within the footprint of the building expansion. As discussed during the August 7, 2007 site visit, the Trust is not contemplating the replacement of the SVE well slated for abandonment. Extraction well SVE-004 was installed in 1999 as part of the Phase II Interim Remedial Action (IRA) and has been operated since 2005 in pulse mode with little or no rebound observed at this location, indicating complete vadose-zone remediation in the area of SVE-004 (Table 1). The most recent concentrations measured at this well were 29 parts per billion volume of tetrachloroethene. In LFR's opinion, well SVE-004 is no longer needed as part of the implementation of the Phase II IRA, and the remaining portion of the SVE system currently running in the area of Benjamin Holt Drive is for the purpose of controlling sparged vapors from the air sparging system (Phase IV IRA). Destruction of well SVE-004 will have no effect upon those remaining efforts. The abandonment of well SVE-004 will be completed by a licensed C-57 drilling company under the observation of an LFR geologist and San Joaquin County Environmental Health Department (SJCEHD) personnel. Before fieldwork is begun, a drilling permit for well abandonment will be obtained from the SJCEHD. At a minimum, the well will be abandoned in place with a cement- bentonite grout slurry placed from the bottom up using a tremie pipe. The associated vault boxes 510.652.4500 no 510.652.2246 f 1900 Powell Street, 12th Floor www.lfr.com Emeryville,California 94608-1814 Offices Nationwide