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<br />0212 <br /> <br />CONTENTS <br /> <br />Abstract................................................................................................................................... .............................................. I <br />Introduclion................................................................................................................................. .......................................... 2 <br />Purpose and Scope...................................................................................................................................... ................ 2 <br />Methods of Investigation ............................................................................................................................................ 5 <br />Description of the Study Area..................................................................................................................................... 5 <br />Acknowledgments..................................................................................................................................... .................. 7 <br />StreamJ\ow ......................................................................................................................................................... ................... 7 <br />Water Quality.......................................................................................................................................... .............................. 8 <br />Dissolved Oxygen and pH .......................................................................................................................................... 8 <br />Dissolved Solids and Major Ions ................................................................................................................................ 10 <br />Trace Elements................................................................................................................................... ......................... 14 <br />Upper Basin..................................................................................................................................... .................. 15 <br />Cadmium .................... ............................. .... ......................... ........................................... ....................... \6 <br />Copper..................................................................................................................................................... 19 <br />Iron............................................................................................................................................. ............. 23 <br />Lead........................................................................................................................................... .............. 26 <br />Manganese.......................................................................................................................................... .... 30 <br />linc ................ ........................................................................................................ ................................. 33 <br />Secondary Trace Elements...................................................................................................................... 37 <br />Lower Basin .................................................................................................................................................. .... 37 <br />Cadmium.. .......................................................................................... .................. ............................. ...... 38 <br />Chromium........................................................................................................................... .................... 39 <br />Copper............................................................................................................................................ ......... 40 <br />Iron.......................................................................................................................................................... 40 <br />Lead................................... ........................................................... .................................. ......................... 43 <br />Manganese .................................................................................................... ....................... .................. 43 <br />Nickel.......................................................................................................................................... ............ 46 <br />Selenium................................................................................................................................ .................. 46 <br />Sil ver .................................................................................................................................................... ... 49 <br />linc ........................................................................................................................................ ................. 49 <br />Nutrients....................................... ................................................................................................................... ........... 5 I <br />Ammonia.................. .................................... ....... .................................................................... .......................... 51 <br />Nitrate ....................................... ........................................................................................................................ 53 <br />Phosphorus................................................................................................................................................ ........ 56 <br />Radiochemical Constituents............. ...................................................................... .................................................... 56 <br />Pesticides........................................ ............................................................................................ ................................ 60 <br />Suspended Sediment.......................................................................... .................................... ...................... .............. 60 <br />Bacteria.................................................................................................................................................. .................... 64 <br />Summary .................................................................................................................................................... ............ .............. 66 <br />Selected References........ ............. .................................................................................................................... .................... 68 <br /> <br />PLATE <br /> <br />(Plale in pocketl <br /> <br />I. Map showing location of selected surface-water stations in the Arkansas River Basin, Colorado, <br />where water-quality data were collected between April 1990 and March 1993. <br /> <br />CONTENTS III <br />