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<br />
<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 (L.K. 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 forthe 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 />
<br />REFERENCES
<br />
<br />Barcelona. MJ., Helfrich, J,A,. Garske, E.E., and Gibb, J.P.,
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<br />associated with irrigation drainage in the Gunnison and
<br />Uncompahgre River basins and at Sweitzer Lake, west-
<br />cemral Colorado, 1988-89: U.S, Geological Survey
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<br />99 p.
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<br />Deason, J.P., 1986, Irrigation-induced contamination prob-
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<br />Defining the problems: V.S. Committee on Irrigation
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<br />1986, Proceedings, p. 201-210,
<br />Epstein. Samuel, and Mayeda, T., 1953, Variation of the 018
<br />content of waters from n<ltural sources: Geochimica et
<br />Cosmochimica Acta, v. 4. no, 5, p. 213-224.
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<br />ods and application to soil saturation extracts from San
<br />Joaquin Valley, California: Soil Science Society of
<br />America Journal. v. 54, no. 2. p, 363-369.
<br />Fishman, M.J" and Friedman, L.C., eds., 1989, Methods for
<br />detennination of inorganic substances in water and flu-
<br />vial sediments (3rd ed,): V.S. Geological Survey Tech-
<br />niques of Water-Resources Investigations, book 5,
<br />chap, A I, 545 p,
<br />Jones. B,E., 1987, Quality control manual of the V,S. Geo-
<br />logical Survey's National Water Quality Laboratory:
<br />U.S. Geological Survey Open-File Report 87-457, 17 p.
<br />Knapton, J.R,. 1985, Field guidelines for collection, treat.
<br />ment. and analysis of water samples, Montana district:
<br />V.S, Geological Survey Open-File Report 85-409, 86 p.
<br />Kendall. Carol, and Coplen, T.B., 1985, Multisample con-
<br />version of water to hydrogen by zinc for stable isotope
<br />detennination: Analytical Chemistry, v. 57, no. 7,
<br />p, 1437-1440.
<br />Makita, S,N., and Fujii, Roger, 1992, Quality assurance
<br />practices of the V.S. Geological Survey laboratory in
<br />Sacramento. California: V.S. Geological Survey Open-
<br />File Report 91-522. 23 p.
<br />Prill, J.w., and Jones. B,E., 1989, 1990 National Water Qual-
<br />ity Laboratory Services Catalog: V,S. Geological Sur-
<br />vey Open-File Report 89-386, variously paged.
<br />Rantz, S,E., and olhers, 1982, Measurement and computa-
<br />tion of streamflow-Volume I. Measurement of stage
<br />and discharge: U,S. Geological Survey Water-Supply
<br />Paper 2175, 284 p.
<br />See, RB" Naftz, D.L.. Peterson, D.A., Crock. J.G,. Erdman,
<br />J,A., Severson, R.C., Ramirez, Pedro, Jr., and
<br />Annstrong, J.A" 1992, Detailed study of selenium in
<br />soil, representative plants. water. bottom sediment, and
<br />biota in the Kendrick Reclamation Project area.
<br />Wyoming, 1988-90: V.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: V,S. Geological Survey Water-
<br />Resources Investigations Report 92-4084, 164 p.
<br />Stewart K.C" Fey, D,L., Hageman, P.L., Kennedy. K,R.,
<br />Love, A.H,. McGregor. R.E., Papp. C.S,E., Peacock,
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<br />REFERENCES 15
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