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M-10A Investigation Report November 30, 2010 <br /> Nestle USA, Inc., Ripon, California <br /> CONTENTS <br /> 1 Introduction........................................................................................................................ 1 <br /> 2 Purpose of Investigation .................................................................................................... 1 <br /> 2.1 Hydrogeology of Study Area ..................................................................................... 1 <br /> 2.2 History of TCE Concentrations in Well M-10A........................................................... 2 <br /> 2.3 Objectives................................................................................................................. 3 <br /> 2.4 Approach .................................................................................................................. 3 <br /> 3 Procedures........................................................................................................................ 4 <br /> 3.1 Field Preparation....................................................................................................... 4 <br /> 3.1.1 Permitting...................................................................................................... 4 <br /> 3.1.2 Access .......................................................................................................... 4 <br /> 3.1.3 Traffic Control Plan........................................................................................ 4 <br /> 3.1.4 City of Ripon Permit Site Walk....................................................................... 5 <br /> 3.1.5 Subsurface Utility Clearance ......................................................................... 5 <br /> 3.2 CPT Drilling............................................................................................................... 5 <br /> 3.3 Groundwater sampling.............................................................................................. 5 <br /> 3.4 Decontamination....................................................................................................... 6 <br /> 3.5 Investigation Derived Waste ..................................................................................... 6 <br /> 4 Investigation Results ......................................................................................................... 6 <br /> 4.1 Borehole Lithology.................................................................................................... 6 <br /> 4.2 Laboratory Results.................................................................................................... 6 <br /> 4.2.1 Upper A Zone TCE Results (50 to 80 Feet BGS)........................................... 7 <br /> 4.2.2 Middle A Zone TCE Results (80 to 95 Feet BGS).......................................... 7 <br /> 4.2.3 Lower A Zone TCE Results (100 to 115 Feet BGS)....................................... 7 <br /> 4.2.4 Other Chemicals of Concern ......................................................................... 7 <br /> 5 Discussion......................................................................................................................... 7 <br /> 5.1 Data Analysis and Interpretation ............................................................................... 8 <br /> 5.2 Conclusions and Recommendations....................................................................... 10 <br /> 6 Remedial Measure .......................................................................................................... 11 <br /> 7 Endnotes......................................................................................................................... 12 <br /> i <br />