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1 Imroduction ^^ I Description of Study Area and Previous Investigations 2 Acknowledgments 4 Geophysical Survey Methods 4 Azimuthal Seismic Refraction 4 Azimuthal Direct-Current Square-Array Resistivity 5 Borehole and Ground-Penetrating Radar 8 Borehole Radar 9 Single-Hole Directional Surveys 9 Cross-Hole Tomography Surveys 10 Ground-Penetrating Radar 11 Surface and Borehole Geophysical Surveys to Determine Fracture Orientation 11 Azimuthal Seismic Refraction 11 Azimuthal Direct-Current Square-Array Resistivity 12 Borehole Radar 14 Single-Hole Directional Surveys 14 Cross-Hole Tomography Surveys 16 Ground-Penetrating Radar 19 Correlation of Fracture Orientation Results 19 Other Site Characteristics Determined from Geophysical Surveys 20 Fracture Porosity and Aperture 20 Depth to Bedrock 20 Summary and Conclusions 22 References Cited 23

water-resources investigations report

Use of surface and borehole geophysical surveys to determine fracture orientation and other site characteristics in crystalline bedrock terrain, Millville and Uxbridge, Massachusetts