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ATC Associates Inc. <br /> %TC <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> 0VSfax: 209-579-2225 <br /> O C I ATE S INC . <br /> precautionary measures (double conductor casings) are warranted to protect the integrity of the <br /> existing sole source potable well at the site. Based on conditions at the site, installing a sentinel <br /> well without conductor casing will increase the likelihood of compromising the potable well via <br /> contaminant migration pathways. <br /> If you have questions or require additional information regarding this Workplan addendum, <br /> please contact us at (209) 579-2221 and/or Mr. Infuma at (209) 468-3420. <br /> I Respectfully submitted, <br /> ATC Associates Inc. <br /> David A. Evans <br /> Senior Geologist <br /> 7 <br /> Todd Hafner, P.G. <br /> CA Professional Geologist No. 8090 <br /> E cc: Mr. Michael J. Infuma - San Joaquin County Environmental Health Department <br /> Mr. Steve Burton, Westree Properties <br /> Mr. Jim Barton, CRWQCB <br /> Attachments <br /> i <br /> li <br /> 3 ATC Associates Inc. <br /> s'. <br /> S:\Environmenial\62514.0001\Pre-approval.doc <br />