SITE INFORMATION AND CORRESPONDENCE

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L E A R WTt, A EALTh G R O U P, I N3C. Environmenn r , ' 05 Mr. Michael Infurna October 29, 1996 San Joaquin County PHS/EHD P. O. Box 388 Stockton, CA 95201-0388 Re: Togo's Property/MBP Site, Lodi Dear Mr. Infurna, Thank you for your phone call last week informing me of the TRC's decision regarding the Togo's request for closure. I agree that closure based on overall threat of the UST-related contaminants to health and the environment is appropriate. As we briefly discussed, you will soon receive a workplan describing proposed methods to investigate the source and the upgradient/cross-gradient extent of hydrocarbon contamination on the MBP property. The workplan will also establish a basis for not further assessing the subsurface south of Lodi Avenue, as this appears to have been sufficiently addressed by others (as evidenced by the TRC decision yesterday). As you are aware, groundwater beneath the current Togo's property has been shown to likely have been impacted by releases from the former service stations at that site, as well as possibly from releases associated with other sources. It will probably not be possible to distinguish one release from another beneath the Togo's property. As such, the PHS/EHD overall risk approach should continue to be applied to this area, in lieu of further assessment. An approach to longer term management of the MBP site will be contemplated following receipt of results of the next phase of site characterization. As we discussed, if levels of contamination are found to be comparable to those evidenced at the Togo's site, a request for similar consideration will likely be prepared. These discussions will include a summary of plans for the site regarding actions that may be taken in association with 1998 UST compliance requirements. 520 Third Street,Suite 104 ♦ Oakland,California 94607 + Telephone 510-893-5160 • Fax 510-893-5947