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<br />nitrite plus nitrate by denitrification from water enter-
<br />ing the small-area flow system. Data did not indicate
<br />that organic-poor sediments in the downstream river
<br />reach were a source of ammonium or phosphorus to the
<br />small-area flow system. However, laboratory studies
<br />did show that those sediments also had the potential to
<br />remove nitrite plus nitrate by denitrification from
<br />waters entering the small-area flow system in the
<br />downstream river reach. In general. the widespread
<br />distribution of sources and sinIcs of dissolved nitrite
<br />plus nitrate, ammonium, and phosphorus in the small-
<br />area flow system makes it difficult to detennine how
<br />much nitrogen and phosphorus is entering the river
<br />from ground-water discharge.
<br />
<br />REFERENCES CITED
<br />
<br />Bowles. J.E., 1978, Engineering properties of soils and
<br />their measuremenl: New York, McGraw-Hili Book
<br />Company, 213 p.
<br />
<br />Bradley, P.M., Aelion, C.M., and Vroblesky, D.A., 1992,
<br />Influence of environmenlal faclors on denitrification
<br />in sediment contaminated with JP-4 jet fuel: Ground
<br />Water, v. 30, p. 843-848.
<br />
<br />Buchanan, T.J., and Somers, w.P., 1969, Discharge measure-
<br />ments at gaging stations: U.S. Geological Survey Tech-
<br />niques of Waler-Resources Investigations, book 3,
<br />chap. A8, 65 p.
<br />
<br />Camp Dresser and McKee, Inc., 1992, Nitrification alterna-
<br />tives study: Report to Metro Waslewater Reclamation
<br />District, 142 p.
<br />
<br />Colorado Department of Health and Environment, 1993,
<br />Classifications and numeric standards for the South
<br />Platte River Basin, Laramie River Basin, Republican
<br />River Basin, and Smoky Hill River Basin: Waler-
<br />Quality Control Commission 5 CCR 1002-8.
<br />
<br />Gaggiani, N.G., Britton, Lj., and Minges, D.R, 1987,
<br />Hydrology of Area 59, Northern Great Plains and
<br />Rocky Mountain Coal Provinces, Colorado and
<br />Wyoming: U.S. Geological Survey Open-File
<br />Report 85-153. 124 p.
<br />
<br />Hurr, T.R, and Schneider, P.A., Jr., 1972, Hydrogeologic
<br />characleristics of the valley-fill aquifer in the Brighton
<br />Reach of the South Platte River Valley, Colorado:
<br />U.S. Geological Survey Open-File Report, 2 p.
<br />
<br />Wershaw, R.L., Fishman, M.J., Grabbe, RR.. and
<br />Lowe, L.E., 1987, Methods for the delermination
<br />of organic substances in waler and fluvial sediments:
<br />U.S, Geological Survey Techniques of Waler-
<br />Resources Investigations, book 5, chap. A3, 80 p.
<br />
<br />While, D.S., 1993, Perspectives on defining and delineating
<br />the hyparheic zones: Journal of the North American
<br />Benthological Society, v. 12, p. 61-69.
<br />
<br />Winler, T.C., LaBaugh, J.W., and Rosenberry, D.O., 1988,
<br />The design and use of a hydraulic polentiomanomeler
<br />for direcl measurement of differences in hydraulic head
<br />between ground waler and surface waler: Limnology
<br />and Oceanography, v. 33, p. 1209-1214.
<br />
<br />
<br />REFERENCES CITED 37
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