SITE INFORMATION AND CORRESPONDENCE FILE 1

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PUBLIC "HEALTH SERVICES SAN JOAQUIN COUNTY 2' ENVIRONMENTAL HEALTH DIVISION y: Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 �P 209/468-3420 0 0 CD ELROY COX EMILY COX P O BOX 1046 M LM JUL2 67996 TRACY CA 95378 RE: 595 E ELEVENTH STREET SITE CODE: 1933 TRACY CA San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is pleased to provide this letter regarding the status of the cleanup of the release from the underground storage tanks formerly located at the above noted address. As you know, a release was documented from the tanks in or around 1979. The investigative work recently completed at the site has provided significant information on the fate and transport of the petroleum over the past 16 years. It appears from field evidence that the release from the tanks traveled along a preferential pathway created by a large diameter underground irrigation pipe that runs adjacent to the former tank pit area. The data gathered recently may fully define the lateral extent of the groundwater plume. The next step in the investigation is to gather additional information on the threat this contamination poses to the current and future users of the water stored in the groundwater basin. All other pathways for this contamination to affect humans will also be considered. Any future cleanup of the site, if found to be warranted, will be based on these considerations. If cleanup measures are required, the current use of the site and disturbances to existing businesses located at the site are considerations when evaluating the cost effectiveness of several remedial alternatives. Because of the current use of the site and the size and scope of the contamination, it is likely that a large scale excavation of soils would not be a cost effective cleanup alternative for this site. In response to several recent studies on petroleum and the State's underground storage tank cleanup program, the State Water Resources Control Board (SWRCB) is currently drafting new state water quality policy to address petroleum contaminated sites. In the interim, the SWRCB has provided guidance to agencies in assessing low risk sites and has requested that active remediation at these sites be replaced with monitoring to establish if the plume is stable and capable of natural degradation processes. In addition, several legislative changes are expected in the next year that will also impact the manner and scope by which petroleum sites are investigated and remediated. These changes at the state level will likely influence the cleanup decision for this site as well. A Division of San Joaquin County Health Care Services