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CONTENTS <br />Foreword .................................................................................................................... <br />Abstract ...................................................................................................................... <br />Introduction ................................................................................................................ <br />Overview of National Water-Quality Assessment Program ............................... <br />Purpose and scope .............................................................................................. <br />Acknowledgments ............................................................................................. <br />Selection, installation, and documentation of wells, and collection of related data.... <br />Well selection .................................................................................................... <br />Well-selection criteria .................................................................................. <br />Well inventory ............................................................................................. <br />Well installation ................................................................................................. <br />Preparation ................................................................................................... <br />Well drilling ................................................................................................. <br />Well completion ........................................................................................... <br />Well development ....................................................................................... <br />Documentation ............................................................................................. <br />Measurement of water levels and collection of additional hydrogeologic <br />and geologic data ........................................................................................... <br />Water levels ................................................................................................ <br />Additional hydrogeologic and geologic data ............................................... <br />References cited ........................................................................................................ <br />ILLUSTRATIONS <br />Figure <br />1. Example of a well-inventory form for the National Water-Quality <br />Assessment Program ..................................................................... <br />2. Form for agreement for use of abandoned test hole or well ................. <br />3. Sample of Form 9-1483 (Aug. 1994), "Agreement for Installation, <br />Maintenance and Use of a Test Hole and/or Observation Well <br />on Private or Property„ ................................................... <br />4. Sketch showing general design of a monitoring well in unconsolidated <br />deposits for National Water-Quality Assessment Program <br />Land-Use and Flowpath Studies .................................................... <br />5. Sketch showing examples of monitoring-well designs in <br />semiconsolidated deposits and in rock ........................................... <br />6. Sketch showing examples of three well-cluster designs ..................... <br />7. Example of a well-information check list for the National <br />Water-Quality Assessment Program .............................................. <br />8. Examples of forms used to record well-drilling, -construction, and <br />-completion information, and to diagram well construction .......... <br />Page <br />1 <br />1 <br />2 <br />5 <br />5 <br />8 <br />8 <br />8 <br />13 <br />21 <br />21 <br />33 <br />36 <br />39 <br />40 <br />56 <br />56 <br />58 <br />64 <br />Page <br />16 <br />19 <br />22 <br />24 <br />26 <br />27 <br />41 <br />45 <br />iv