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Geosyntec <br /> consultants <br /> TABLE OF CONTENTS <br /> 1. INTRODUCTION....................................................................................................................1 <br /> 1.1 Background .....................................................................................................................1 <br /> 1.2 Regulatory Framework....................................................................................................2 <br /> 1.3 Previous Environmental Investigations...........................................................................3 <br /> 1.4 COCs in Groundwater.....................................................................................................5 <br /> 1.5 Objectives........................................................................................................................7 <br /> 2. HYDROGEOLOGIC CONCEPTUAL SITE MODEL............................................................8 <br /> 2.1 RRI CSM Background....................................................................................................8 <br /> 2.2 Regional Geology and Hydrogeology.............................................................................9 <br /> 2.2.1 Geologic Units.....................................................................................................9 <br /> 2.2.2 Groundwater........................................................................................................9 <br /> 2.2.3 Climate ................................................................................................................9 <br /> 2.3 RRI Geology and Hydrogeology...................................................................................10 <br /> 2.3.1 Site Setting and Topography.............................................................................10 <br /> 2.3.2 Drainage Channels ............................................................................................10 <br /> 2.3.3 Lithology...........................................................................................................11 <br /> 2.3.4 Water-Bearing Zone..........................................................................................11 <br /> 2.3.5 Groundwater......................................................................................................13 <br /> 3. GROUNDWATER DATA GAPS..........................................................................................15 <br /> 3.1 Site 3..............................................................................................................................15 <br /> 3.2 Site 4..............................................................................................................................15 <br /> 3.3 Central Area ..................................................................................................................16 <br /> 4. MONITORING WELL INSTALLATIONS ..........................................................................17 <br /> 4.1 New Monitoring Well Installations...............................................................................17 <br /> 5. GROUNDWATER MONITORING PROGRAM .................................................................18 <br /> 5.1 Field Inspection and Depth to Water.............................................................................18 <br /> 5.2 Selection of Monitoring Wells for Sampling ................................................................18 <br /> 5.3 Sampling and Analysis..................................................................................................19 <br /> 5.3.1 Field Methods and Procedures ..........................................................................19 <br /> 5.3.2 Laboratory Methods and Procedures.................................................................19 <br /> 5.4 Investigation-Derived Waste Management...................................................................19 <br /> 6. SCHEDULE AND REPORTING..........................................................................................21 <br /> 7. REFERENCES .......................................................................................................................22 <br /> RRI Groundwater Monitoring Work Plan ii June 2022 <br />