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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 Model"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 MW5 and MW6 had concentrations of 1,2 DCA in them. 1,2 DCA was not found in <br /> groundwater samples from MWI 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 MWL 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,RENS,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 />