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changes associated with the start-up of Unit II. Investigations of fish impingement/entrain- ment associated with water withdrawal are presented in this report. 131. Ecology Consultants, Inc. 1976. Yampa Project Interim Phase D: Ecological investigations near Craig Station Site, Moffat County, Colorado. Technical Report No. 300. 64 PP• These studies represent the baseline data and monitoring of year-to-year changes in baseline data associated with preconstruction conditions. Impacts of the water intake structure are also evaluated. 132. Ecology Consultants, Inc. 1976. Yampa Project Tnterim Phase D: Ecological investigations near Hayden Station, Routt County, Colorado. Technical Report No. 301. 43 pp. Ecological studies conducted in the vicinity of Hayden Station during 1975 were directed toward evaluation of potential incremental impacts associated with the impending start up of Unit II and evaluation of potential impacts associated with mine pit burial of fly ash. Qualitative evaluation of fish use of the intake channel and adjacent areas of the Yampa River, and a quantitative evaluation of larval fish in the same areas. 133. Eddy, R. M. 1975. The effect of point source discharge on the diversity of benthic macroinvertebrates of the Yampa River, Steamboat Springs to Hayden, Colorado. Technical Investigations Branch, Surveil- lance and Analysis Division, U. S. Environ- mental Protection Agency, Region VIII, Denver, Colorado. SA/TIB-30. (Abstr.) A survey was conducted by the U. S. Environmental Protection Agency during September, 1975 to determine the effect of known point-source discharges on the benthic invertebrates of the Yampa River, Steamboat Springs to Hayden, Colorado, a distance of approximately 61 km (38 ENVIRON. STUDY DEVELOPMENT FISH MOVEMENTS SPAWNING YAMPA R. ENVIRON, STUDY FISH SPAWNING DEVELOPMENT MOVEMENTS YAMPA R. POLLUTION WATER QUAL. TNVERTEBRATES YAMPA R. 59