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<br />0!l1319 <br /> <br />3. Geometric mean concentrations of arsenic, molybdenum, uranium, and zinc in soils from alluvium <br />overlying Mancos Shale in the Uncompahgre Project area and in soils from the Western United States ............. 21 <br />4. Hydrogeologic senings of the ground-water-flow systems affected by irrigation in the <br />Uncompahgre Project area and in the Grand Valley............................................................................................... 25 <br />5. Results of thermodynamic speciation calculations for water from wells in the Uncompahgre Project area <br />and from the Grand Valley...................................................................................................................................... 32 <br />6. Evaporite mineral species and salt efflorescence associated with the Mancos Shale and shale residuum in <br />the Grand Valley ..................................................................................................................................................... 33 <br />7. Semiquantitative clay and bulk mineralogy of Mancos Shale bedrock core, shale residuum, alluvium, and <br />ground-water-filter residuum ....... ........... ................ ......... .......... ........ .............. ........... ...... ........... ............ ....... ........ 36 <br />8. Element and organic-carbon concentrations in soil and rock samples from the Uncompahgre Project area <br />and from the Grand Valley ...................................................................................................................................... 37 <br />9. Geochemical environments of the ground-water-flow systems, hydrogeologic settings, and ranges of <br />dissolved-selenium concentrations in Mancos Shale residuum and alluvium in the irrigated Uncompahgre <br />Project area and in the Grand Valley ...................................................................................................................... 38 <br />10. Concentrations of dissolved redox-active constituents, water properties. and hydrogeologic setting <br />of water from wells in alluvium and shale residuum in the Uncompahgre Project area and in the <br />Grand Valley.... ......... ........ ...... .... .......................... ........... ...... .......................... .................. ........... ........... ...... ......... 39 <br />11. Speciation of dissolved selenium in selected ground-water samples from the Uncompahgre Project area <br />and from the Grand Valley...................................................................................................................................... 41 <br />12. Speciation of extractable selenium in alluvial-aquifer-sediment samples from the Grand Valley......................... 42 <br />13. Energies of reaction for oxidation of selenium by oxygen and nitrate................................................................... 44 <br />14. Sulfur-isotope data for water from selected wells in shale residuum and alluvium ............................................... 45 <br />15. Summary of selenium concentrations in the Gunnison and Colorado Rivers and Plateau Creek and the <br />number of samples exceeding aquatic-life criteria of the U.S. Environmental Protection Agency....................... 49 <br />16. Summary of selenium concentrations in irrigated areas of the Uncompahgre Project in 1991-92 and the <br />number of samples that exceeded aquatic-life criteria of the U.S. Environmental Protection Agency................. 55 <br />17. Summary of selenium concentrations in samples collected during the synoptic surveys of the Uncompahgre <br />Project. January through March 1992..................................................................................................................... 58 <br />18. Summary of selenium concentrations in irrigated areas in the Grand Valley and the number of samples <br />that exceeded aquatic-life criteria of the U.S. Environmental Protection Agency................................................. 64 <br />19. Summary of selenium concentrations in samples collected during the synoptic surveys of the Grand Valley, <br /> <br />February and March 1992..... .................. .............. ............ ..... ..... ........ .................. ........................ ....... ................... 68 <br />20. Concentrations of dissolved selenium, selenate. and selen'te in water samples collected from five streams <br />in the Grand Valley, March 24. 1992...................................................................................................................... 70 <br />21. Pearson correlation coefficients of selenium concentration to specific conductance and to dissolved-solids. <br />major-ion, boron, and uranium concentrations for the Uncompahgre Project and the Grand Valley.................... 80 <br />22. Summary of dissolved trace-constituent concentrations in surface-water samples from the Uncompahgre <br />Project area and from the Grand Valley, 1991-92.................................................................................................. 89 <br />23. Concentrations of selenium, uranium. total carbon, and organic carbon in bottom-sediment. sall-crust, <br />and soi I samples.................................. ................... ........... .......... ......... .................. ............ .............. ........... ............ 91 <br />24. Concentrations of total, soluble, and adsorbed selenium and the percent selenite in bottom-sediment <br />samples from eight streams, March 1992......................................................:........................................................ 92 <br />25. Statistical summary of selenium concentrations in selected biota samples collected in 1991 in the <br /> <br />Uncompahgre Project area........ ..... ......... .................................................. ....... ..................... .......................... ........ 97 <br />26. Number of whole-body fish samples collected in the Uncompahgre Project area that exceeded the <br />1984 National Contaminant Biomonitoring Program 85th-percentile concentrations for seven trace <br />conslituents . ........ ... ... ... ......... ..... ............. .......... ........ .............. ... ... .......... ..... .......... ... .......... ........... ............. ......... ... 97 <br />27. Statistical summary of selenium concentrations in selected biota samples collected during 1991 from <br /> <br />the Grand Valley..... ........................... ............................... ............................... ............ ................. .................... ...... 102 <br />28. Number of whole-body fish samples collected in the Grand Valley that exceeded the 1984 National <br />Contaminant Biomonitoring Program 85th-percentile concentrations for seven trace constituents ...................... 103 <br /> <br />CONTENTS VII <br />