SITE INFORMATION AND CORRESPONDENCE

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Planning for Closure of 750eWest Eleventh Street, Tracy Page 2 evaluation would be based on an extended round of groundwater-quality monitoring to be conducted in February 2005. That monitoring round would include analyses designed to confirm the presence of hydrogeologic and geochemical conditions that are supportive of the process of intrinsic attenuation, including attenuation by natural bioremediation, that appears to be active at the site. 2. After the round of groundwater-quality monitoring proposed for February 2005 has been conducted, Monitoring Wells MW-3A, MW-313 and MW-12A should be closed under the permit and oversight of the SJCEHD. These wells have supported assessment of the vertical extent to which soil and groundwater is affected by fuel hydrocarbons. However, they penetrate aquifers at depth beneath the site and, because they are no longer needed to support the technical objectives of the site characterization and monitoring program, their continued presence now represents an unnecessary risk to groundwater quality in the unaffected aquifers which they penetrate. We propose to close other wells on the site according to a schedule that we propose to dcvelop in consultation Lvitli you and that Rill be based on the proposed assessment of intrinsic remediation active in the subsurface. 3. We also recommend termination of sampling and analysis of groundwater in potable water supply wells in the neighborhood of the site. Three quarterly rounds of monitoring of the quality of those water supplies has shown them to be free of any analytes of concern related to the releases of fuel hydrocarbons that occurred at the 7500 West Eleventh Street site. The affected well owners should be notified of the successful completion of the monitoring program. To ensure that our work will be compatible with your agency's directives, to initiate the proposed program we would like to meet with you so that we can discuss the specific tasks to be performed and provide an overview of the technical aspects of the proposed procedure for evaluation of intrinsic remediation that appears to be active at the site. A meeting in early-to mid-January 2005 would be consistent with the proposed field schedule, which calls for the round of sampling designed to evaluate the sustainability of intrinsic remediation at the site to be conducted in February of that year. If you have any questions,please call me at(510)336-9118. Sincerely D. J. W tkins,PhD,PE President The San Joaquin Company Inc. cc. Mr. Carl Bart Navarra(Property Owner) Ms Nina Ciani (State Water Resources Control Board-UST Cleanup Fund) Mr. James Barton (Regional Water Quality Control Board -Central Valley Region.) Mr. Bernie Dietz(The San Joaquin Company Inc.)