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Californi#egional Water Quality Cool Board <br /> vCentral Valley Region <br /> Linda S.Adams Karl E. Longley, SCD, P.E., Chair Arnold <br /> Secretaryfor p ��;. Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670.6114 L' �I[_ Governor <br /> Protection Phone(916)464-3291•FAX(916)464-4645 .-. _ <br /> hup://www.waterbouds.ca.gov/centralvalley <br /> SEP 1 8 <br /> ENVIROM,111ENI hL;,_ ., <br /> 15 September 2008 PERM;T/�`)ERVICI' <br /> Mr. Mike Desso <br /> Nestl6 USA Inc. <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> ANNUAL GROUNDWATER MONITORING REPORT— 2007 FORMER NESTLE USA, INC., <br /> 230 INDUSTRIAL AVENUE, RIPON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the 2007 Annual Groundwater Monitoring Report (Annual Report), <br /> dated 15 March 2008. The Report was prepared by Environmental Cost Management, Iric. <br /> (ECM), on behalf of Nestl6 USA, Inc. (Nestl6) for its former coffee decaffeination facility <br /> located at 230 Industrial Avenue, Ripon, California (Former Facility). <br /> Specific Data Analysis Needs <br /> Regional Water Board staff believes that the Annual Reports should include focused <br /> analyses of the following four specific areas: <br /> 1. Former Industrial Avenue facility and adjacent properties, <br /> 2. Stockton Avenue groundwater treatment system site and adjacent properties, <br /> 3. City wastewater ponds and adjacent land, and <br /> 4. City municipal well MW-9 and adjacent land. <br /> Well location map Figure 2 should be utilized as a base map for page-size groundwater flow <br /> contouring and plume concentration contouring maps for these four areas. Such maps • <br /> should be included in future annual reports. Additional data collection appears to be needed <br /> in order to understand the direction of groundwater flow and the extent of treatment system <br /> capture. Specific data needs for each of the four areas are summarized below: <br /> 1. Former Industrial Avenue Facility. There are not enough monitoring wells screened in <br /> the Shallow Aquifer beneath the Former Facility at Industrial Avenue to verify the <br /> groundwater extraction system influence shown by the piezometric surface contours <br /> drawn on Figures 3-1 through 3-4 of the Annual Report. Side-gradient monitoring wells <br /> should be installed in the Shallow Aquifer to monitor the piezometric surface elevations <br /> approximately 50 feet from extraction wells EU-3 and EU-4. Also, the following nearby, <br /> inactive extraction wells should be monitored if accessible: EU-1, EU-2, EI-1, ED-1, <br /> ED-2, EE-1, and EW-1. <br /> California Environmental Protection Agency <br /> Q*Recycled Paper <br />