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a <br /> Californi-.'Regional Water Quality Conial Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair 0 <br /> Linda S.Adams 11020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Arnold <br /> Secretaryfor Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental Protection http://www.waterboards.ca,gov/centralva11 <br /> Governor <br /> RfJ I EIME1 U ;EV <br /> 5 November 2009 NOV 1 0 2009 <br /> ENVIRONMENT HEALTH <br /> Nestle USA Inc. PERMIT/SERVICES <br /> Attention: Mr. Mike Desso <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> VAPOR EXTRACTION WELL DECOMMISSIONING, FORMER NESTLE USA, INC. <br /> FACILITY, RIPON, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the 21 October 2009 letter prepared by Environmental Cost Management, Inc., <br /> (ECM), and sent to San Joaquin County Environmental Health Division (County) on behalf of <br /> Nestle USA, Inc. (Nestle). The letter proposes to decommission eight soil vapor extraction <br /> wells and requests that three missing vapor extraction wells be labeled as lost in the County <br /> records. The eleven wells were utilized to extract trichloroethylene (TCE) vapor from soil at <br /> two locations on the former Nestle decaffeination plant site at 230 Industrial Avenue and one <br /> location on the Nestle property at 519 South Stockton Avenue, Ripon, California. <br /> Central Valley Water Board staff has no objection to decommissioning of the vapor extraction <br /> wells, provided the work is performed in a manner that does not further impact soil or <br /> groundwater, and is conducted in accordance with County requirements. However, Nestle <br /> should conduct further work to locate the missing wells and expand the documentation of its <br /> efforts conducted to date. <br /> Well VE-4 was screened through the water table surface and may be a conduit for migration <br /> of contaminants from the unsaturated soil. If the location coordinates were measured after <br /> the well was installed, Nestle should retain a surveyor to relocate this missing well. If <br /> significant effort has already been made to locate VE-4, Nestle should document the effort. <br /> Significant effort should include excavation activities at the estimated well location. <br /> The ECM letter indicates that the wells were installed between 1998 and 1999. However, the <br /> eight well logs attached to the letter indicate that the wells were installed between 1986 and <br /> 1997. Nestle should proceed with decommissioning of the eight wells identified in the ECM <br /> letter and document its efforts to locate the three missing wells, with emphasis on locating <br /> VE-4. The missing well effort documentation can be included in the report of well <br /> decommissioning results. Also, in the report Nestle should include the well logs for the three <br /> wells that are currently missing. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />