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CalifornioRegional Water Quality Crol Board <br /> Central Valley Region . <br /> Robert Schneider,Chair <br /> Linda S.Adams Arnold <br /> Secretaryfor Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)4644645 <br /> hftp://www.waterbouds.ca.gov/centralvalley <br /> 6 July 2006 RECEIVED <br /> ADMINISTRATION <br /> Nestle USA Inc. JUL 1 0 2006 <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 SAN JOAQUIN COUNTY <br /> Attention: Mr. Mike Desso PUBUCHE&THSERVICEII <br /> DRAFT WELL INSTALLATION REPORT FOR PLUME DELINEATION SOUTH OF THE <br /> STANISLAUS RIVER, FORMER NESTLE USA, INC. FACILITY, RIPON, CALIFORNIA <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the Draft Well Installation Report for Plume Delineation South of <br /> the Stanislaus River, Former Nestle USA, INC. Facility, dated 16 December 2005 (draft <br /> Report). The report was prepared by Environmental Cost Management, Inc., (ECM) on <br /> behalf of Nestl6 USA, Inc. (Nestl(§) for the former facility located at 230 Industrial Avenue, <br /> Ripon, California (Site). This review letter identifies items that should be addressed in the <br /> Final Report. <br /> The draft Report documents groundwater monitoring well installation activities conducted to <br /> further delineate the lateral and vertical extent of a volatile organic compound (VOC) plume <br /> of contamination released to groundwater. The release, primarily trichloroethylene (TCE) <br /> and to some extent methylene chloride, occurred during decaffeination process activities <br /> conducted at the former Nestl6 facility in Ripon, California. This phase of Nestl6's <br /> investigation was focused on the extent of VOCs that have migrated to private water supply <br /> wells located south of the Stanislaus River; the river is approximately 4,000 feet south of the <br /> Site. Nestl6 installed 10 groundwater monitoring wells clustered in four locations south of <br /> the river and 4 wells in two locations adjacent to the north bank of the river. Prior to <br /> installation of wells at each cluster location, Nestl6 advanced a soil boring by sonic drilling <br /> methods to collect lithology and water quality data. Lithology data were collected in <br /> continuous cores; water quality data were collected discretely at various intervals using a <br /> submersible pump and packer while the bore-holes were advanced. These data were used <br /> to identify zones to be screened by monitoring wells. <br /> Review Comments <br /> The following comments have been prepared by Regional Water Board staff: <br /> 1. The draft Report was prepared before professional survey work could be completed. As <br /> a result, approximate well locations were plotted on the location figure in the draft Report. <br /> Now that survey work has been performed, Nestl6 should provide the professional well <br /> surveyor's report and a revised figure with the final Report. <br /> California Environmental Protection Agency <br /> �d Recycled Paper <br />