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Gilcrest/LaSalle Pilot Project <br />Hydrogeologic Characterization Report <br />TABLE OF CONTENTS <br />TABLEOF CONTENTS.............................................................................................................i <br />ACKNOWLEDGMENTS............................................................................................................ <br />v <br />INTRODUCTION....................................................................................................................... <br />7 <br />STUDY PURPOSE AND SCOPE................................................................................................7 <br />PREVIOUSWORK......................................................................................................................7 <br />CGS CONTRIBUTIONS TO STUDY AREA HYDROGEOLOGIC CHARACTERIZATION ........ 3 <br />HYDROGEOLOGIC CHARACTERIZATION............................................................................5 <br />STUDY AREA GEOGRAPHIC SETTING....................................................................................5 <br />STUDY AREA GEOLOGIC CONCEPTUAL MODEL.................................................................6 <br />SurfaceTopography..........................................................................................................6 <br />Primary Study Area Geologic Units...................................................................................7 <br />Bedrock Topography and Geology...................................................................................9 <br />Alluvial Aquifer Depositional Setting...............................................................................11 <br />CGS Revised Alluvial Aquifer Extent..............................................................................12 <br />Hydraulic Conductivity, Specific Yield, and Transmissivity.............................................12 <br />GROUNDWATER LEVELS.......................................................................................................13 <br />Groundwater Level Trends..............................................................................................14 <br />Depth -to -Groundwater Trends........................................................................................15 <br />GROUNDWATER FLOW...........................................................................................................16 <br />ALLUVIAL AQUIFER UNDERFLOW AND STORAGE............................................................17 <br />DATA GAP EVALUATION........................................................................................................18 <br />Temporal Groundwater Level Data Gaps.......................................................................18 <br />Spatial Groundwater Level Data Gaps............................................................................19 <br />Aquifer Property Data Gaps............................................................................................19 <br />SUMMARYAND CONCLUSIONS..........................................................................................21 <br />RECOMMENDATIONS........................................................................................................... <br />25 <br />ADDITIONAL GROUNDWATER LEVEL MONITORING..........................................................25 <br />THREE-DIMENSIONAL LITHOLOGIC CHARACTERIZATION...............................................26 <br />EXPANDED AQUIFER PROPERTY CHARACTERIZATION...................................................26 <br />DETAILED SURFACE MAPPING.............................................................................................27 <br />REFERENCES........................................................................................................................ <br />29 <br />