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0 <br /> ,. <br /> E"RONIMENTAL COST MANAGIEMENT,INC. <br /> 3525 Hyland Avenue,Suile 200 <br /> C..1a Me..,California 92626 <br /> g. Main:(714)662.2759 Fax (714)662-2758 <br /> July 7, 2010 <br /> James Brownell, P.G. ,_. ECO\l`111 D E <br /> Central Valley Regional Water Quality Control Board Ilf�ldD <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, CA 95670 JUL 0 9 WO <br /> Re: Stockton Avenue Groundwater Extraction System Shutdown Request ENVIRUIVMENHEALTH <br /> Former Nestle USA, Inc. Facility PERMIT/SfRUICEs <br /> 230 Industrial Avenue <br /> Ripon, CA 95366 <br /> Dear Mr. Brownell: <br /> On behalf of Nestle USA, Inc. (Nestle) Environmental Cost Management, Inc. (ECM) seeks <br /> Regional Water Quality Control Board (RWQCB) concurrence with its request to shutdown the <br /> Stockton Avenue Groundwater Extraction System (Stockton Avenue System). <br /> ECM originally made this request in a letter dated November 9, 2009. In response, the RWQCB <br /> directed ECM to: <br /> • Install new wells to confirm that the concentrations of trichloroethylene (TICE) and other <br /> constituents of concern (CDCs) resulting from a sewer line leak have been sufficiently <br /> reduced in the B-zone(Upper Aquifer) at Stockton Avenue, <br /> • Demonstrate there is no source of COCs in the C-zone (Intermediate Aquifer) in the area of <br /> the Stockton Avenue site, and <br /> • Verify the Site Conceptual Model (SCM) prepared by AMEC-Geomatrix, which concluded that <br /> the concentrations of TCE and other COCs within the C-zone at Stockton Avenue resulted <br /> from migration from the City of Ripon sewage treatment ponds. <br /> Accordingly, ECM installed two B-zone wells at Stockton Avenue, and one C-zone well on Fifth <br /> Street, which is located south of Stockton Avenue between Stockton Avenue and the City of <br /> Ripon sewage treatment ponds. The well installation was detailed in the April 15, 2010 Monitoring <br /> Well Installation Report for the Industrial and Stockton Avenue Extraction and Treatment System' <br /> (Installation Report). The Installation Report also included the analysis of groundwater data <br /> collected during and after the well installations. <br /> Environmental Cost Management, Inc. Monitoring Well Installation Report for the Industrial and Stockton Avenue <br /> Extraction and Treatment System,Former Nest14 USA, Inc. Facility, Ripon CA. April 15, 2010. <br />