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<br />CONTENTS <br /> <br />Abstract.................................................................................................................................................................................1 <br />Introduction ..... ...... ...... .... ................................................................ .... ........... ............... ......................................... ............... I <br />Purpose and scope ............................ .................. ...................... ....... ........... ..................... .................................. ........... 2 <br />Acknowledgments............................................ ............. ........................... ..................... ............................................... 2 <br />Sample collection and analysis ........... .................... .... ................ ............. .... .................... ...... ......... .... ............................ ...... 4 <br />Sampling sites ............... ..... .......... .................... .................. ...................... ................. .... ....... ...... .................................. 4 <br />Sampling methods ....... ....... .... ............... ......... ............. ....... ................................... .... ......... ...... ............. .... ........... .... .... 4 <br />Analytical methods ........ ........ ............... ....... ............... .................. .................... .... ................................ ................... .... 5 <br />Description and organization of data .................................................................................................................................... 6 <br />References .................................................... ........... .................. ..................................... .................................. ..................... 15 <br />Hydrologic and biological data............................................................................................................................................. 17 <br /> <br />PLATES <br /> <br />[Plates are In pocket] <br /> <br />1. Map showing location of data-collection sites in the Uncompahgre Project area and <br />extent of irrigated area. <br />2. Map showing location of data-collection sites and extent of irrigated area in the Grand Valley. <br /> <br />FIGURES <br /> <br />1. Map showing location of the Uncompahgre Project and the Grand Valley....................................................... 3 <br />2-7. Maps showing ranges of: <br />2. Downhole specific conductance of water from selected wells in the Uncompahgre Project area, <br />October 1991. Well depths range from 8 to 60 feet ..................................................................................... 7 <br />3. Downhole dissolved oxygen in water from selected wells in the Uncompahgre Project area, <br />October 1991. Well depths range from 8 to 60 feet .................................................................................... 8 <br />4. Downhole specific conductance of water from selected wells in the Grand Valley, June-July 1991. <br />Well depths range from 9 to 100 foot............................................................................................................ 9 <br />5. Downhole specific conductance of water from selected wells in the Grand Valley, March 1992. <br />Well depths range from 9 to 100 foot............................................................................................................ 10 <br />6. Downhole dissolved oxygen in water from selected wells in the Grand VaI]ey, June.July 1991. <br />Well depths range from 9 to 100 fool............................................................................................................ 11 <br />7. Downhole dissolved oxygen in water from selected wells in the Grand Valley, March 1992. <br />Well depths range from 9 to ]00 feet............................................................................................................ 12 <br />8. Graph showing water-level altitude and specific conductance of water in welll43NO, Grand Valley, <br /> <br />March 1992-March 1993 ............................................................................................................................... 13 <br />9. Graph showing historical water-level altitudes and concentrations of dissolved solids in water from <br />wells 125Q5 and 208KO,located in the Grand Valley................................................................................. 14 <br /> <br />CONTENTS III <br />