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.aye► - !�'l���. <br /> PUBLIC -rIEALTH SERVICES <br /> SAN JOAQUIN COUNTY °P �o <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 952021 • c°C;FORi�v' <br /> 209/468-3420 a' <br /> THOMAS O'NE1LL & ANDREW HYDUKE RAR 2 5 1997 <br /> PO BOX 923 <br /> STOCKTON CA 95201 <br /> RE: Valley Motors SITE CODE: 1166 <br /> 800 E. Main St. <br /> Stockton, CA., 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has presented this site to the Technical Review Committee (TRC) for evaluation of the <br /> underground tank investigation. The findings and recommendations are noted below. <br /> Based on past and present groundwater gradient directions, the TRC has <br /> recommended another groundwater monitoring well be installed onsite in the north- <br /> northeast area. In addition, a soil gas survey should be conducted. Areas of particular <br /> concern are just east of the former underground tanks and the area between and <br /> around VM-1 and VM-2. <br /> It was the finding of the TRC that two separate groundwater plumes appear to exist at <br /> this site. One plume appears to radiate easterly from the former dispenser island and <br /> the other plume appears to radiate easterly from just east of the former underground <br /> tanks. It was apparent to the members of the TRC that the rather low petroleum <br /> concentrations previously detected in the soil do not parallel the relatively high levels of <br /> petroleum detected in the groundwater. A soil gas survey should provide a rather cost- <br /> effective method to determine the area(s) that have, and may still be, impacting the <br /> groundwater. <br /> Currently this site has not determined the full lateral extent(s) of the groundwater <br /> plume(s) nor if any receptors are present within a 2000 foot radius. In order to <br /> complete your investigative phase for this site, these aspects should be addressed in a <br /> proposal submitted to PHS-EHD soon. <br /> Once your source(s) have been determined, the receptor survey completed, and your <br /> groundwater plume(s) delineated, PHS-EHD should be able to evaluate this site for a <br /> low risk closure or confirm the need for active remediation. <br /> Please continue to quarterly sample the monitoring wells and analyze for MTBE. The <br /> State Water Resources Control Board now requests that at least one groundwater <br /> A Division of San Joaquin County Health Care Services <br />