Geohydrologic and Water-Quality Characterization of a Fractured-Bedrock Test Hole in an Area of Marcellus Shale Gas Development, Bradford County, Pennsylvania

9 Introduction 11 Study Site And Test Hole 11 Methods 11 Core 12 Geophysical Logs 13 Water-Quality Samples 17 Geohydrologic And Water-Quality Characterization Of The Gleason Test Hole 19 Spatial Trajectory Of The Test Hole 19 Stratigraphy And Lithology 19 Bedding 22 Fractures 22 Water-Bearing Zones 24 Water Quality 31 Specific Conductance, Dissolved Solids, And Major Ions 31 Trace Constituents And Radiochemicals 34 Organic Constituents And Nutrients 36 Gases And Stable Isotopes 37 Composition Of Gas Extracted From Core 37 Concentrations Of Dissolved Gas And Stable Isotopes In Water 39 Insights Into Active And Restricted Groundwater Flow 41 Summary 43 Acknowledgments 45

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