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is <br /> l <br /> M <br /> i <br /> Shell sites summary <br /> Page 3 <br /> interim system. It was discussed that the contamination is not defined since there is benzene in the <br /> lateral shallow wells. <br /> 3725 Tracy Blvd, Tracy <br /> An SCM that includes a "Request for No Further Action" will be prepared for this site. <br /> 880 Victor Road, Lodi <br /> The temporary groundwater extraction system will continue to be operated. EHD will review the <br /> "Subsurface Investigation Report, Fourth Quarter 2005Groundwater Monitoring Report, and Site <br /> Conceptual ModeT dated February 23, 2006 and provide written comments. <br /> 4315 Waterloo Road, Stockton <br /> Six soil borings and three monitoring wells were installed in December 2005. Groundwater samples <br /> from MWS and MW6 had concentrations of 1,2 DCA in them. 1,2 DCA was not found in <br /> groundwater samples from MW1 through MW4 previously. Shell will have all the groundwater <br /> samples analyzed for 1,2 DCA. MTBE and TBA concentrations increased in the groundwater <br /> samples from MW1 . Active remediation to reduce the oxygenate concentrations may be necessary. <br /> A discussion and recommendation to reduce the contaminant concentrations should be included in <br /> the next quarterly report. <br /> 1160 Yosemite Avenue Manteca <br /> An SCM has been submitted. EHD will discuss closure of the site with the CVRWQCB. <br /> If you have any questions or comments please contact the appropriate LOP staff overseeing the site <br /> or call me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> c CVRWQCB —James L. L. Barton, RG <br /> Cambria — Joe Neely, Aubrey Cool <br /> i <br />