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<br />TABLES <br /> <br />I. Surface-water-sampling sites and types of samples collected in the Uncompahgre Project area............................. 18 <br />2. Surface-water-sampling sites and types of samples collected in the Grand Valley.................................................. 21 <br />3. Records of selected wells and a spring in the Uncompahgre Project area and selected wells in the <br />Grand Valley. .......... ............................ .......... ........... ............... ..... .... ............... ................... ...... ........ ......................... 23 <br />4. Onsite measurements and chemical data for surface-water sites in the Uncompahgre <br />Project area, 1991-92................. ....... ........ .................... .... .......................... ............. ................................................. 24 <br />5. Onsite measurements and chemical data for surface-water sites in the Grand Valley, 1991.92............................... 48 <br />6. Onsite measurements and chemical data for sites on the Colorado River and Plateau Creek and <br />the Gunnison River at Whitewater, 1991-92 ............................................................................................................ 62 <br />7. Stable-isotope ratios of hydrogen and oxygen in surface water, Uncompahgre Project area and the <br />Grand Valley, 1991-92.............. ........... ...................... .... .............................. ..... .... .... ............. ................ ................... 70 <br />8. Concentrations of insecticides in water samples from the Grand Valley, 1991........................................................ 71 <br />9. Onsite measurements of selected properties of water from selected wells and a spring in the <br />Uncompahgre Project area and selected wells in the Grand Valley, 199]-92 .......................................................... 72 <br />10. Concentrations of major dissolved constituents, nitrogen species. and dissolved organic carbon in <br />water from selected wells and a spring in the Uncompahgre Project area and selected wells in the <br />Grand Valley, ] 991.92 . .................................... ........... ............. ........... ..................... ....... .................. ........... ............. 75 <br />11. Concentrations of dissolved trace elements in water from selected wells and a spring in the <br />Uncompahgre Project area and selected wells in the Grand Valley, 1991-92.......................................................... 79 <br />12. Stable-isotope ratios of oxygen, hydrogen, sulfate sulfur, and nitrate nitrogen in water from selected wells <br />and a spring in the Uncompahgre Project area and selected wells in the Grand Valley, 1991-92............................ 83 <br />13. Trace-element concentrations in bollom-sediment samples, in a salt-crust sample, and in a soil sample................ 85 <br />14. Major-constituent, total-carbon, and organic-carbon concentrations in bollom-sediment samples, <br />in a salt-crust sample, and in a soil sample............................................................................................................... 87 <br />15. Trace-element concentrations from whole-rock analyses of bedrock and aquifer-sediment samp]es...................... 88 <br />16. Major-constituent, total-carbon, and organic-carbon concentrations from whole-rock analyses of <br /> <br />bedrock and aquifer-sediment samples ............ ........................ ................................... ........ .......... ....... .............. ....... 92 <br />17. Semiquantitative bulk and clay mineralogy of Mancos Shale core, shale residuum, alluvium, and <br />ground-water filter residuum........ ........... .... ........... ......... .................. ............ .... ........... ...... ............................. .... ..... 93 <br />]8. Concentrations of dissolved selenium species in surface-water samples from the Grand Valley, <br />March 24, ] 992 .... ....... .... .... .... ......... ............... .......................... ........... ..................... ......................... ....................... 94 <br />]9. Concentrations of dissolved selenium species in water from selected wells in the Uncompahgre <br />Project area and in the Grand Valley, 1992............................................................................................................... 94 <br />20. Concentrations and speciation of extractable selenium in bottom-sediment samples from the <br />Uncompahgre Project area and the Grand Valley, 1992........................................................................................... 95 <br />21. Concentrations and speciation of extractable selenium in aquifer-sediment samples from the <br />Grand Valley............ ....................... ................. ........................, .... .... ................... ............................. ........................ 95 <br />22. Aquifer-test results from wells in the Mancos Shale and associated alluvium, Grand Valley................................. 96 <br />23. Trace-element concentrations in aquatic-plant, aquatic-invertebrate, and fish samples collected from <br />tributaries west of the Uncompahgre River and within the Uncompahgre Project during 1991.............................. 97 <br />24. Trace-element concentrations in aquatic-plant, aquatic-invertebrate, and fish samples collected from <br />tributaries east of the Uncompahgre River and within the Uncompahgre Project during 1991............................... 99 <br />25. Trace-element concentrations in aquatic-plant, aquatic-invertebrate, and fish samples collected from <br />Crawford Reservoir, the Smith Fork, and the North Fork of the Gunnison River during 1991............................... ]00 <br />26. Trace-e]ement concentrations in aquatic-plant, aquatic-invertebrate, and fish samples collected <br />from the Gunnison River and tributaries between the confluence with the North Fork and the confluence <br />with the Uncompahgre River during 1991 ............................................................................................................... 102 <br />27. Trace-element concentrations in aquatic-plant, aquatic-invertebrate, amphibian, and fish samples <br />collected from tributaries of the Gunnison River downstream from the confluence with the Uncompahgre <br /> <br />River during 1991 .... ...... ................................. ........................ ........... ................... ................... .... ............................. 104 <br />28. Trace-element concentrations in aquatic-invertebrate, amphibian, and fish samples collected from <br />tributaries of the Colorado River west of Fruita and from Highline Lake during 1991.......................................... 105 <br /> <br />IV CONTENTS <br />