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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> TABLE OF CONTENTS <br /> Page <br /> 1.0 Introduction .....................................................................................................................1 <br /> 2.0 Site Location and Background.........................................................................................1 <br /> 3.0 2021 Hydrologic Monitoring Program ..............................................................................3 <br /> 3.1 Bedrock Groundwater Monitoring ....................................................................................4 <br /> Hydrogeology..............................................................................................................6 <br /> Wadge and Wolf Creek Overburden............................................................................8 <br /> Twentymile Sandstone ................................................................................................9 <br /> Trout Creek Sandstone................................................................................................9 <br /> FishCreek Sandstone..............................................................................................11 <br /> 3.2 Alluvial Groundwater Monitoring....................................................................................12 <br /> Foidel Creek Alluvial Groundwater............................................................................13 <br /> Fish Creek Alluvial Groundwater ..............................................................................14 <br /> Trout Creek Alluvial Groundwater.............................................................................14 <br /> Middle Creek Alluvial Groundwater...........................................................................15 <br /> 3.2.1 Points of Compliance............................................................................................15 <br /> 3.3 Surface Water Monitoring..............................................................................................16 <br /> Monitoring / Sampling Requirements........................................................................16 <br /> StreamGaging.........................................................................................................22 <br /> FoidelCreek.............................................................................................................22 <br /> FishCreek................................................................................................................23 <br /> TroutCreek ..............................................................................................................23 <br /> MiddleCreek............................................................................................................23 <br /> 3.4 Spoil Spring Monitoring .................................................................................................24 <br /> 3.5 Natural Spring Monitoring..............................................................................................25 <br /> 3.6 CDPS Discharge Sites ..................................................................................................26 <br /> 3.7 Mine Water Discharge Sites..........................................................................................26 <br /> i <br />