SITE INFORMATION AND CORRESPONDENCE_1997

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ftY 14'97 15:04 FR LEVINE FRICKE 510 6524906 TO 12094683433 P.02i08 if Ridwen • May 7, 1947 4111.55-009 vfa,n x and US. mart A.I. Birkbeck, Esq. Zevmk Horton Gutbord&McGovern 77 West Wacker Drive, 33rd Floor Chicago, Illinois 60601 Subject: Response to Lincoln Properties, Ltd.'s March-31—, VW7 Leser ding Site Access Approval sad 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 WE&which provided recommendations regarding the procedures for evaluating the groundwater totality distribution in monitoring well MW-21 at Lincoln Center in Stockton, California, and granted LFR site access to perform the Proposed work. The scope arid 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 meaningm 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 motley 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 fbgsD 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-zonc monitoring wells, and to assess the variability of Hazardous Substances in groundwater present in discrete sand touts within the B-zone aquifer at this location. 1000 Powell Street. 12th floor, Emeryville. California 84608-1827 • (510) 652-4500 • fax (510) 652-2246 Offices Worldwide