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ameO <br /> TABLE OF CONTENTS <br /> Page <br /> 1.0 INTRODUCTION ............................................................................................................ 1 <br /> 1.1 OBJECTIVES .........................................................................................................2 <br /> 1.2 SCOPE .................................................................................................................2 <br /> 1.3 ORGANIZATION OF THIS REPORT ...........................................................................2 <br /> 2.0 REGIONAL SETTING.....................................................................................................3 <br /> 2.1 GEOLOGY.............................................................................................................3 <br /> 2.2 HYDROGEOLOGY ..................................................................................................6 <br /> 3.0 FORMER NESTLE FACILITY AT 230 INDUSTRIAL AVENUE......................................7 <br /> 3.1 SITE HISTORY.......................................................................................................7 <br /> 3.1.1 Chemical Use..........................................................................................8 <br /> 3.1.2 Historical Onsite Groundwater Pumping .................................................9 <br /> 3.1.3 Detections of COCs in Plant Production Wells...................................... 10 <br /> 3.1.4 Remedial Investigations ........................................................................ 10 <br /> Post-RI Characterization Activities........................................................ 12 <br /> 3.1.5 Remedial Actions .................................................................................. 13 <br /> Soil Vapor Extraction............................................................................. 13 <br /> Groundwater Extraction and Treatment................................................ 15 <br /> 3.2 HYDROSTRATIGRAPHY........................................................................................ 16 <br /> 3.3 WATER LEVELS................................................................................................... 17 <br /> 3.4 SPATIAL DISTRIBUTION OF COCS IN SITE GROUNDWATER ................................... 18 <br /> 3.4.1 M-25 Depth Profile of COCs.................................................................. 18 <br /> 3.4.2 Spatial Distribution of TCE in Site Groundwater ................................... 19 <br /> B-zone 19 <br /> UpperA-zone ........................................................................................ 19 <br /> MiddleA-zone .......................................................................................20 <br /> LowerA-zone (A-zone) .........................................................................20 <br /> 3.4.3 Other COCs Detected in Groundwater Samples...................................21 <br /> 3.4.4 Mass Recovery by Groundwater Extraction Wells ................................21 <br /> 3.5 CONCEPTUAL MODEL FOR TCE RELEASE, FATE, AND TRANSPORT.......................22 <br /> 3.5.1 Timing and Location of TCE Release....................................................22 <br /> 3.5.2 Historical Migration of TCE in Groundwater..........................................23 <br /> 3.5.3 Potential Mechanism for Historical Elevated TCE in Lower A-Zone <br /> Groundwater.....................................................................................................24 <br /> 3.6 IMPLICATIONS .....................................................................................................24 <br /> 4.0 STUDY AREA...............................................................................................................25 <br /> 4.1 SHALLOW STRATIGRAPHY OF THE RIPON AREA....................................................25 <br /> 4.2 HYDROGEOLOGY ................................................................................................27 <br /> 4.3 RECHARGE AND PUMPING...................................................................................28 <br /> 4.3.1 Influence of River Stage on Water Levels.............................................28 <br /> 4.3.2 Groundwater Recharge.........................................................................29 <br /> Municipal Wastewater Treatment Lagoons...........................................29 <br /> Neenah Paper, Inc. Industrial Wastewater Disposal.............................31 <br /> 4.3.3 Groundwater Pumping ..........................................................................32 <br /> City of Ripon Municipal Supply Wells....................................................32 <br /> AMEC Geomatrix, Inc. <br /> IADoc_Safe\9000s\9837.005\4000 REGULATORY\SCM_01.30.09\1_text\SCM Report Final.doc I <br />