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Page 1 of 1 <br /> Lori Duncan [EH] <br /> From: Zehr, Michelle [Michelle.Zehr@WestonSolutions.com] <br /> Sent: Friday, June 02, 2006 3:24 PM <br /> To: Lori Duncan [EH] <br /> Subject: San Joaquin Quarterly Groundwater Monitoring Project <br /> Hi Lori, <br /> I was wondering if I could borrow a bit of your time to go over some of the outstanding issues related to the 145 <br /> South Sutter Street quarterly groundwater monitoring project. As you may know, we have foregone the sampling <br /> this past quarter in order to address the potential closure of the site per your department's letter of November 17, <br /> 2005. 1 am in the process of reviewing the Corrective Action Plan (CAP)and wanted to discuss the issue of <br /> vertical extent of contamination. The plume is currently centered on well MW-2,which is a shallow well. There is <br /> some residual contamination being detected in the deeper well MW-2A,which is located near MW-2; however, <br /> these levels are far lower and suggest that contamination is decreasing with depth. I am wondering if this will <br /> suffice as definition of the vertical extent or if further investigation is necessary. If this is the case, I will need to <br /> incorporate this investigative element into the updated CAP. <br /> Please let me know your thoughts on this when you have a chance to review the previous quarter results. <br /> Thanks and have a great weekend, <br /> Michelle <br /> Michelle Zehr <br /> Associate Geoscientist <br /> Weston Solutions, Inc. <br /> 1575 Treat Blvd., Suite 212 <br /> Walnut Creek CA 94598 <br /> (925)948-2656 <br /> (925)948-2601 FAX <br /> michelle.zeh rOwestonsolutions.com <br /> 6/7/2006 <br />