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Nestle USA, Inc., Ripon, California March 31, 2011 <br /> 2010 Annual Report <br /> CONTENTS <br /> 1 Introduction............................................................................................................................1 <br /> 2 Key Activities in 2010.............................................................................................................2 <br /> 2.1 Water Replacement Contingency Plan...........................................................................3 <br /> 2.2 Groundwater Investigation..............................................................................................4 <br /> 2.3 Groundwater Monitoring .................................................................................................4 <br /> 2.4 Interim Remedial Action Plan System Performance.......................................................4 <br /> 2.5 2011 Revised Feasibility Study ......................................................................................4 <br /> 2.6 Water Management Plan for the Ripon Study Area .......................................................5 <br /> 2.7 Stockton Avenue Groundwater Extraction And Treatment System Shutdown...............6 <br /> 2.8 Vapor Extraction Well Closure........................................................................................6 <br /> 3 Groundwater Monitoring ........................................................................................................7 <br /> 3.1 Well Network for Groundwater Monitoring......................................................................8 <br /> 3.1.1 Nestle Monitoring Wells................................................................................................9 <br /> 3.1.2 Private Wells.................................................................................................................9 <br /> 3.1.3 Private Well Head Treatment........................................................................................9 <br /> 3.1.4 City of Ripon Production Well Network.........................................................................9 <br /> 3.1.5 Nestle Groundwater Extraction System Network..........................................................9 <br /> 3.1.6 Well Inspection and Corrective Actions ........................................................................9 <br /> 3.2 Water Level Monitoring.................................................................................................10 <br /> 3.2.1 Wells Not Used for Potentiometric Surface Maps....................................................... 10 <br /> 3.2.2 Groundwater Elevation Changes................................................................................11 <br /> 3.2.3 Groundwater Observations.........................................................................................12 <br /> 3.3 Water Quality................................................................................................................13 <br /> 3.3.1 Upper Aquifer..............................................................................................................13 <br /> 3.3.2 Intermediate Aquifer ...................................................................................................15 <br /> 3.3.3 Lower Aquifer..............................................................................................................16 <br /> 3.4 City of Ripon Municipal Wells.......................................................................................17 <br /> 3.5 Discussion of Intrinsic Remediation Assessment Results............................................19 <br /> 4 Ongoing Remedial Action....................................................................................................19 <br /> 4.1 Industrial Avenue Extraction and Treatment System ...................................................20 <br /> 4.1.1 Operation and Maintenance ........................................................................................20 <br /> 4.1.2 Performance Monitoring ..............................................................................................21 <br /> 4.2 Stockton Avenue Extraction and Treatment System ....................................................22 <br /> 4.2.1 Operation and Maintenance .......................................................................................22 <br /> 4.2.2 Performance Monitoring .............................................................................................23 <br /> 4.3 Private Wellhead Treatment Systems ..........................................................................24 <br /> 4.3.1 Operation and Maintenance .......................................................................................24 <br /> 4.3.2 Performance Monitoring .............................................................................................25 <br /> 5 Conclusions.........................................................................................................................26 <br /> 5.1 Groundwater Investigation............................................................................................27 <br /> 5.2 Groundwater Monitoring ...............................................................................................27 <br /> 5.3 Groundwater Extraction and Treatment .......................................................................27 <br /> 5.4 Migration Control ..........................................................................................................27 <br /> 6 Recommendations...............................................................................................................28 <br /> 7 Planned Activities for 2011 ..................................................................................................28 <br /> 7.1 Reporting Activities for 2011.........................................................................................28 <br /> 7.2 Proposed Field and Other Activities .............................................................................29 <br /> 8 Endnotes .............................................................................................................................30 <br /> ii <br />