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California9egional Water Quality Cont' of Board <br /> Central Valley Region <br /> Katherine Hart, Chair41 <br /> ''.; <br /> 1102115un Center Drive,#200,Rancho Cordoaa,Cnldrrnm -'iJ;-4 <br /> Matthew Rodriquez (916)454-3291 •FAX(916)464-4543 Edmund G.Brown Jr, <br /> etory,fo, httpl/www waterboards.ca.gov/centrahallev Governor <br /> Environmental Protection <br /> 7 November 2011 <br /> yyn <br /> Nestl6 USA Inc. / pG <br /> Attention: Mr. Mike Desso S>It s <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> MONITORING WELL M-10A INVESTIGATION WORK PLAN ADDENDUM, <br /> FORMER NESTLE USA, INC. FACILITY, RIPON, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the 28 October 2011 document titled M-10A Investigation Work Plan Addendum <br /> (Work Plan Addendum) prepared by Environmental Cost Management, Inc., (ECM), on behalf <br /> of Nestl6 USA, Inc. (Nestl6). The purpose of the Work Plan Addendum is to continue the <br /> investigation proposed in the 6 June 2010 document titled M-1 OA Investigation Work Plan <br /> (Work Plan). The investigation was initiated because of the increasing trichloroethene (TCE) <br /> and cis-1,2-dichloroethene (cis-1,2-DCE) concentrations observed in groundwater samples <br /> collected from monitoring well M-10A, located approximately 1,000 feet northwest of the <br /> former Nestl6 coffee decaffeination facility at 230 Industrial Avenue, Ripon, California. <br /> During the second half of 2010, Nestl6 completed the investigation activities proposed in the <br /> Work Plan and submitted findings in the 30 November 2010 document titled M-10A <br /> Investigation Report(Report). Central Valley Water Board staff commented on the Report and <br /> required additional investigation work in a review letter dated 31 August 2011. The <br /> investigation work proposed by Nestl6 in the Work Plan Addendum complies with the <br /> requirements of the staff letter. Therefore, the Central Valley Water Board staff approves the <br /> Work Plan Addendum, and requests that the work be initiated before the end of 2011. We <br /> understand that ECM has scheduled a drilling contractor to begin on 12 December 2011. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards,ca.gov. <br /> g. <br /> JAMES R. BROWNELL, P.G. <br /> Engineering Geologist <br /> Federal Facilities Unit <br /> Enclosure: Distribution List <br /> California Environmental Protection Agency <br /> Z10 Recycled Paper <br />