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California Regional Water Quality Control Board <br /> �'�. • Central Valley Region • <br /> Katherine Hart, Chair *07� <br /> Linda S. Adams 11020 Sun Center Drive#200, Rancho Cordova,California 95670-6114 Arnold <br /> Secretary/or Phone(916)464-3291 -FAX(916)464-4645 Schwarzenegger <br /> Environmental http://www.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> ROSE@ <br /> 19 April 2010 2010 <br /> APR 2 3 <br /> Nestle USA Inc. ENVIROWENT HFAQN <br /> Attention: Mr. Mike Desso PERMITISERMES <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> FINAL GROUNDWATER MONITORING AND REPORTING PROGRAM R5-2010-0810 <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 /> received requests from Nestle USA, Inc. (Nestle) to issue a new Monitoring and Reporting <br /> Program (MRP) for unauthorized discharges from the former Nestle facility at 230 Industrial <br /> Avenue, Ripon, California. Staff has attached MRP No. R5-2010-0810, issued by the <br /> Central Valley Water Board. MRP No. R5-2005-0829, dated 21 July 2005, has been <br /> rescinded and is replaced by the attached MRP. <br /> The enclosed MRP makes minor revisions to the previous MRP in response to requests by <br /> Nestle and as a result of Central Valley Water Board staff evaluation of the data. This MRP <br /> modifies the sampling frequency of wells outside of the estimated probable area of plume <br /> migration and incorporates the many guard monitoring wells installed after the Central Valley <br /> Water Board issued the 2005 MRP. <br /> The Central Valley Water Board issued MRP No. R5-2005-0829 following the April 2005 <br /> detections of volatile organic compounds (VOCs), including trichloroethylene and vinyl <br /> chloride, in two private drinking water supply wells adjacent to the south side of the <br /> Stanislaus River in Stanislaus County. In April 2005, Nestle immediately provided sources of <br /> clean water to the well owners. During 2005 through 2009, Nestle sampled many other <br /> private drinking water supply wells south of the river on a monthly or quarterly schedule. <br /> VOC contamination has not been detected in those wells. Also, Nestle has installed and <br /> sampled monitoring wells south of the river to characterize the extent of the VOC plumes. <br /> These wells have characterized the extent of VOCs south of the river. In addition, Nestle <br /> has installed and sampled many monitoring wells throughout the central area of Ripon to <br /> characterize the extent of VOC plumes in four hydrogeologic zones. Staff has reviewed the <br /> results of water sample analyses and concluded that changes to the MRP were appropriate. <br /> California Environmental Protection Agency <br /> Ci Reo'cled Paper <br />