SITE INFORMATION AND CORRESPONDENCE_1997

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L1�evine Fricke-Recon SUGhMSTS May 7, 1997 4111.55-009 via fax and U.S. mail A.J. Birkbeck, Esq. Zevnik Horton Guibord & McGovern 77 West Wacker Drive, 33rd Floor Chicago, Illinois 60601 Subject: Response to Lincoln Properties, Ltd.'s March 31, 1997 Letter Regarding Site Access Approval and Procedures for the Monitoring Well MW-21 Evaluation, Lincoln Center, Stockton, California Dear A.J.: On behalf of the Settling Dry Cleaning Defendants, Levine-Fricke-Recon Inc. (LFR) is responding to Lincoln Properties, Ltd.'s (LPL's) March 31, 1997 letter which provided recommendations regarding the procedures for evaluating the groundwater quality distribution in monitoring well MW-21 at Lincoln Center in Stockton, California, and granted LFR site access to perform the proposed work. The scope and intention of LFR's initial investigation proposed in our March 18, 1997 letter was to collect data to use in assessing the potential for well MW-21 to cross screen sand units in the B-zone that may have different concentrations of volatile organic compounds (VOCs), thus allowing for the potential for cross contamination to occur in the B-zone at this location. In our opinion, such an approach could provide meaningful data, which could then be used in evaluating MW-21. However, in light of the extensive comments and conditions for approval imposed by LPL in its March 31, 1997 letter, we have elected to take a different approach to investigating conditions at MW-21. Given the subsequent transaction costs that would likely ensue from the predictable debate relative to which approach (LFR's or Farr Associates') has the most merit, we feel that such money would be better spent funding a more detailed investigation approach. Proposed Investigation LFR proposes to investigate groundwater quality distribution in MW-21 by drilling a soil boring to collect in situ groundwater samples from each of the sand layers in the B-zone aquifer. This approach would provide timely data, and would have the added benefit of allowing collection of a discrete-depth groundwater sample from each sand interval screened by MW-21 and from the bottom sand interval in the B-zone in the vicinity of MW-21 (approximately 135 to 138 feet below ground surface [bgs]) which is not screened by MW-21 but is intercepted by the sand pack at the bottom of MW-21. Data collected from the push-in polyvinyl chloride penetrometer (PIPP) samples and logging of the borehole would be reviewed and used to determine the need for additional B-zone monitoring wells, and to assess the variability of Hazardous Substances in groundwater present in discrete sand units within the B-zone aquifer at this location. 1900 Powell Street, 12th Floor, Emeryville, California 94608-1827 (510) 652-4500 • fax (510) 652-2246 O//ices Worldwide