USGS_GeophysicalLoggingInSLV_Report

CONTENTS Abstract....................................................................................................................... ...........................................................1 Introduction................................................................................................................... .........................................................1 Purpose and Scope.............................................................................................................. .........................................3 Acknowledgments................................................................................................................ .......................................3 Geohydrologic Setting.......................................................................................................... .................................................3 Water Levels and Heads in the Confined-Aquifer System.......................................................................... ..........................3 Description of Well Logs....................................................................................................... ................................................4 Analysis of Geophysical Logs................................................................................................... ............................................7 Alamosa County................................................................................................................. .........................................10 Well ALA.2..................................................................................................................... ...................................10 Well ALA.3..................................................................................................................... ...................................10 Well ALA.4..................................................................................................................... ...................................10 Well ALA.6..................................................................................................................... ...................................12 Well ALA.8..................................................................................................................... ...................................15 Well ALA.9..................................................................................................................... ...................................15 Well ALA.10.................................................................................................................... ..................................15 Well ALA.12.................................................................................................................... ..................................17 Well ALA.13.................................................................................................................... ..................................20 Well ALA.14.................................................................................................................... ..................................20 Well ALA.15.................................................................................................................... ..................................20 Well ALA.16.................................................................................................................... ..................................23 Conejos County................................................................................................................. ..........................................25 Well CON.3..................................................................................................................... ..................................25 Well CON.4..................................................................................................................... ..................................25 Costilla County................................................................................................................ ............................................27 Well COS.1..................................................................................................................... ...................................27 Rio Grande County.............................................................................................................. ........................................28 Well RIO.1..................................................................................................................... ....................................28 Well RIO.2..................................................................................................................... ....................................28 Well RIO.3..................................................................................................................... ....................................31 Well RIO.4..................................................................................................................... ....................................31 Saguache County................................................................................................................ .........................................32 Well SAG.1..................................................................................................................... ...................................32 Well SAG.2..................................................................................................................... ...................................32 Well SAG.4..................................................................................................................... ...................................36 Well SAG.5..................................................................................................................... ...................................36 Well SAG.7..................................................................................................................... ...................................39 Well SAG.9..................................................................................................................... ...................................40 Well SAG.10.................................................................................................................... ..................................42 Well SAG.11.................................................................................................................... ..................................42 Well SAG.12.................................................................................................................... ..................................42 Well SAG.13.................................................................................................................... ..................................46 Well SAG.17.................................................................................................................... ..................................46 Well SAG.18.................................................................................................................... ..................................49 Appropriate Use of Water Levels Measured in Confined-Aquifer Network Wells..................................................... ..........50 Summary........................................................................................................................ ........................................................56 References..................................................................................................................... .........................................................58 CONTENTSiii