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<br />Dissolved Solids and Major Constituents and Relations to Selenium ........................................................................ 77 <br /> <br />Dissol ved Solids ...... .................. ......... ............ .............. ....... ..... .............. ......... .......... ............. .................... ....... 79 <br />Chloride and Evaporative Concentration .......................................................................................................... 82 <br /> <br />Other Major Constituents .................................................................................................................................. 84 <br />Other Trace-Constituent Concentrations. ........... ...... ........... ...... ............. ............... ....... ............ ................... ................ 87 <br /> <br />Insecticides in the Grand Valley .................................................................................................................................. 89 <br />Selenium and Other Constituents in Bottom Sediment ........................................................................................................ 90 <br />Sample Collection and Analytical Methods ................................................................................................................ 90 <br /> <br />Selenium Concentrations ................ ....... .............. ............... ............... .......... ........... ........... ......... .......... ....................... 90 <br />Other Trace-Constituent Concentrations. ................. ........ ...................... .............. ....... ........... ...................... ..... .......... 93 <br />Biological Investigations... ................. .............. ...... ............. .............. ....... ....... ............ ........................... ..... ..................... ..... 93 <br />Sample Collection .......... .......... .......... .................. ......... ................ ..... .............. ........ ............ ............ .............. ...... ....... 93 <br />Analytical Methods ........ ....... .......... .................. .......... ..................................... ........ .......... .............. ............... ..... ....... 94 <br />Data Analysis... .......... ........... .......... .................... .................. ....... ...... ........ .............. ........... .................... ........ ..... ........ 94 <br />Data Interpretation................. ....... ............ ........................... ....... ................................................... ........................ ...... 94 <br />Selenium Concentrations in Fish Samples and Their Food Hems in Irrigated Areas ................................................. 95 <br /> <br />Uncompahgre Project .................... .................. ....... ....... ....... .......... .................... .......... ........... .......... ................ 95 <br />Areas Adjacent to the Uncompahgre Project .................................................................................................... 98 <br /> <br />Grand Valley......... ....... .......... .................... ......... ................ .................... ........ ............ ............ ........................... 100 <br />Selenium Concentrations in Fish Samples from Mainstem Rivers ............................................................................. 104 <br />Risk Assessment for Endangered Fish from Selenate and Selenite ............................................................................ 107 <br />Other Trace-Constituent Concentrations in Fish Tissues and Fish Food Items in Irrigated Areas ............................. 108 <br /> <br />Uncompahgre Project Area ............................................................................................................................... 108 <br />Grand Valley ...................................................................................................................................................... III <br />Other Trace-Constituent Concentrations in Fish TIssues and Fish Food Items from Mainstem Rivers ..................... 112 <br />Risk Assessment for Endangered Fish from Four Trace Constituents ........................................................................ 113 <br />Organic Contaminants in Fish TIssues ........................................................................................................................ ] 13 <br />Selenium Concentrations in Migratory Birds and Their Food Items .......................................................................... 115 <br /> <br />Uncompahgre Project Area Wetlands................................................................................................................ 115 <br />Grand Valley Wetlands ...................................................................................................................................... 118 <br />Other Trace-Constituent Concentrations in Birds and Their Food Hems.................................................................... 118 <br />Incubation Studies of Bird Eggs .................................................................................................................................. 120 <br />Field Observations at Wetland Sites ............................................................................................................................ 120 <br />Water and Bottom-Sediment Bioassays ...................................................................................................................... 122 <br /> <br />Water Bioassays........... .......... ................................. .......... .................. ............................... ................. ....... ........ 122 <br />Bottom-Sediment Bioassays....................... ........ .......... ........ ........ ...................... ..... .............. .... ......... ............... 123 <br />B ioaccumulation of Selenium.... .......... .............. ............................. ......... .................... ............................... .......................... 123 <br />Implications for Human Health .......... ........................ .................... ..... ........ ............... ..................... .................. ........ ....... ..... 124 <br />Summary ............. ....... ......... ............................................... ....... ............. ............................. .......... ......... ........... ....... ...... ........ 125 <br />References Cited ............ .............. ........... .............. .......... ........ ........... ...... ......... ...................... ................................ ......... ...... 129 <br /> <br />FIGURES <br /> <br />1-6. Maps showing: <br />1. Location of the Uncompahgre Project area, the Grand Valley, and selected water-sampling <br /> <br />sites on major streams................................. ....... ............. ....... ............... .................... .................. ........ ............ 4 <br />2. Selected features in the Uncompahgre Project area........................................................................................ 7 <br />3. Selected features in the Grand Valley ............................................................................................................. 8 <br />4. Generalized surficial geology of the Uncompahgre Project ........................................................................... 9 <br /> <br />IV CONTENTS <br />