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PUBLIC hEALTH SERVES UIN <br /> SAN JOAQUIN COUNTY ' °c <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer . <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA(7 <<F O R <br /> 209/468-3420 <br /> ARTHUR BARBOUR FJEC 0 5 1996 <br /> WELLS FARGO BANK <br /> 111 SUTTER STREET <br /> SAN FRANCISCO CA 94163 <br /> RE: WELLS FARGO BANK PROPERTY SITE CODE: 506077 <br /> 49 S WILSON WAY <br /> STOCKTON <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has <br /> completed the review of the workplan and the response to comments on the workplan, submitted <br /> by Building Analytics, and offers the following comments for your consideration. <br /> The high concentrations of gasoline constituents identified in the well located adjacent to this <br /> property indicate a nearby source not attributable to any of the previously identified petroleum <br /> release sites. As the tank system formerly located on this property near the area of this well is <br /> suspect, the area expected to be impacted from a release from this former tank system must be <br /> investigated as a source. Assuming a similar distribution pattern as those found at the nearby <br /> release sites, the bulk of a release is expected to be located primarily directly beneath the former <br /> underground storage tanks. The former associated piping and dispensers may also prove to be a <br /> contributor. Therefore, the soil borings proposed for this investigation ideally should be placed <br /> directly through these suspected source areas, if at all possible. Investigations focused in the <br /> source areas prove to be the most efficient and cost effective over time, and usually have more <br /> timely resolutions. <br /> Based on the above, the current scope of work proposed for this site appears to be sufficient. <br /> However, the final placement of the soil borings, as accurately as possible, in the source areas is <br /> highly recommended. This work can be scheduled to begin after the permit to drill is issued by <br /> this office. Please also provide this office, at the number shown below, with at least 48 hours <br /> advance notice prior to initiating the work at the site. <br /> If you have any questions or wish to discuss this letter in more detail, please contact Linda <br /> Turkatte, Senior REHS, at(209)468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Linda A. Turkatte, Senior REHS Margaret C'agorio, REHS <br /> Site Mitigation Unit Supervisor <br /> c: CVRWQCB, Beth Thayer <br /> c: Building Analytics, Joseph Montoya <br /> A Division of San Joaquin Countv Health Care Services <br />