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<br />clay mineralogy for Mancos Shale core, shale resid-
<br />uum, alluvium, and ground-water filter residuum are
<br />listed in table 17.
<br />Selenium-speciation data are listed in tables 18
<br />through 21. Concentrations of dissolved-selenium spe-
<br />cies (selenate and selenite) for selected surface-water
<br />and ground-water samples are listed in tables 18 and
<br />19. Selenium concentrations and speciation data for
<br />sequential extractions of selenium from selected bot-
<br />tom-sediment and aquifer-sediment samples are listed
<br />in tables 20 and 21.
<br />The U.S. Bureau of Reclamation did aquifer tests
<br />for hydrogeological investigations of the Grand Valley
<br />during the 1970's and 1980's. Selected aquifer-test
<br />results are summarized in table 22 (LX. Weston,
<br />U.S. Bureau of Reclamation, written commun., 1992).
<br />Trace-element concentrations in biota samples
<br />are listed in tables 23 through 37. Trace-element data
<br />collected in 1991 for the synoptic sampling of main-
<br />stem rivers and tributaries are listed in tables 23
<br />through 31. Biota data for tributaries of the
<br />Uncompahgre River are listed in tables 23 and 24, and
<br />biota data for the Gunnison River and its tributaries,
<br />including Crawford Reservoir, are listed in tables 25
<br />through 27. Biota data collected in 1991 in the Grand
<br />Valley for tributaries of the Colorado River are listed in
<br />tables 28 through 30, and biota data collected for the
<br />Colorado River in 1991 are listed in table 31. Trace.
<br />element data for biota samples collected from wetland
<br />sites in 1991-92 are listed in tables 32 through 34.
<br />Trace- element concentrations in fish samples collected
<br />in 1992 from the North Fork of the Gunnison,
<br />Gunnison, Uncompahgre, and Colorado Rivers are
<br />listed in tables 35 through 37.
<br />A limited number of biota samples were col-
<br />lected for organic analyses, and the analytical results
<br />are listed in tables 38 and 39. Organochlorine-pesti-
<br />cide and PCB data are listed in table 38, and polycyclic
<br />aromatic hydrocarbon data are listed in table 39.
<br />
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<br />ity Laboratory Services Catalog: U.S. Geological Sur-
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<br />Rantz, S.E., and others, 1982, Measurement and computa.
<br />tion of streamflow-Volume I. Measurement of stage
<br />and discharge: U.S. Geological Survey Water-Supply
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<br />See, RB., Naftz, D.L., Peterson, D.A., Crock, J.G., Erdman,
<br />J.A., Severson, RC., Ramirez, Pedro, Jr., and
<br />Armstrong, J.A., 1992, Detailed study of selenium in
<br />soil, representative plants, water, bottom sediment, and
<br />hiota in the Kendrick Reclamation Project area,
<br />Wyoming, 1988-90: U.S. Geological Survey Water-
<br />Resources Investigations Report 91-4131,142 p.
<br />Stephens, D.W., Waddell, Bruce, Peltz, L.A., and Miller,
<br />J.B., 1992, Detailed study of selenium and selected ele-
<br />ments in water, bottom sediment, and biota associated
<br />with irrigation drainage in the middle Green River
<br />basin, Utah, 1988-90: U.S. Geological Survey Water-
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<br />Stewart KC., Fey, D.L, Hageman, P.L., Kennedy, KR,
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<br />REFERENCES 15
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