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Well Monitoring Program -2- 26 March 1993 <br /> DDRW, Tracy <br /> 3. It is unnecessary to monitor for background concentrations of metals in LM-11, <br /> LM-12 and LM-63 because four quarters of data have been collected from these <br /> wells. <br /> In our 11 September 1992 letter, we recommended that only four on-site monitor wells <br /> (LM-3, LM-15, LM-16 and LM-27A) be continued to be sampled and analyzed for <br /> pesticides and metals, as well as for VOCs. The analytical results of the first <br /> four quarters of data yielded concentrations of non-detect for pesticides and metals <br /> in most of the other monitor wells. <br /> We believe that the site-wide comprehensive ground water monitoring plan should be a <br /> living document that requires modification on an annual basis. Recommendations for <br /> changes in the monitoring plan will require the approval of all of the Project <br /> Managers prior to implementation. <br /> If you have any questions, please call Mr. James Taylor at (916)255-3065 or me at <br /> (916)255-3069. <br /> CAMILLA WILLIAMS <br /> Engineering Geologist <br /> CKW:cw <br /> Enclosures <br /> cc: Mr. Michael Work, U. S. Environmental Protection Agency, Region IX, San <br /> Francisco <br /> Mr. Jim Pinasco, Department of Toxic Substances Control , Region 1, <br /> Sacramento <br /> Ms. Dianne Hinson, Public Health Services of San Joaquin County, <br /> Environmental Health Department, Stockton <br /> Mr. Marshall Cloud, Defense Distribution Region West, Tracy, Tracy <br /> Mr. Steve Light, U. S. Army Corps of Engineers, Huntsville, Alabama <br />