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reported concentrations were too hi9gh to support aquatic life on streams acknowledged by the <br /> U.S. Forest Service as good fisheries. <br /> 12. Pagegment 5; North Fork of the Gunnison <br /> Hubbard Creek was not separated from this segment as requested by the Blue Ribbon Coal <br /> Company as the presence of three species of trout justifies a class 1 aquatic life classification. <br /> The water supply use is also in place and the evidence indicated that uses in Hubbard Creek were <br /> compatible with the balance of the segment. In addition, although the Blue River Coal Company <br /> is a NPDES discharge permit holder there is currently no discharge and no current economic <br /> impact. <br /> 13. Page 9, Segment 5 <br /> An aquatic life classification of cold water, class 1 was requested for Wehauken Creek to protect <br /> an existing private trout hatchery on the creek. However, the majority of the tributary streams in <br /> this segment do not support fisheries because of steep gradients. The Commission elected to <br /> classify the segment as aquatic, cold water, class 2 with table values for cold water, class 1 to <br /> protect the fish hatchery on Wehauken Creek. <br /> 14. Page 9, Segment <br /> The aquatic life classification was removed because the Commission found no evidence of <br /> aquatic life in this segment and determined that there was no expectation of such use in the <br /> future. The segment is badly degraded by mine drainage. <br /> 15. Page 12, Segment 2 <br /> The Commission assigned the segment a cold water, class 1, aquatic life classification having <br /> found: That the City of Delta would not be adversely impacted due to the dilution provided by <br /> large stream flows. <br /> 16. Page 14, Segment <br /> An underlying standard for ammonia of.08 mg/1 was adopted based upon the results of a <br /> bioassay conducted in 1975. Although this represents a relaxation of the proposed standard of <br /> .06 mg/l, this result is justified since the bioassay reflects site specific conditions for pH, <br /> temperature and TDS, which factors affect ammonia toxicity. <br /> The temporary modification for ammonia reflects seasonal variations in ammonia levels based <br /> upon existing discharge permit conditions. Since the existing discharge will cease in 1986, the <br /> conditions causing exceedence of the underlying standard will be corrected within a 20 year <br /> period These facilities will be replaced by new facilities designed for zero discharge of ammonia. <br /> In view of the cost of the new facilities and the limited duration of the existing discharge, a <br /> standard necessitating additional interim treatment facilities would not be economically <br /> reasonable. <br /> COLORADO DEPARTMENT OF HEALTH <br /> Water Quality Control Division <br /> 4210 East 11 th Avenue <br /> Denver, Colorado 80220 <br /> FISCAL IMPACT STATEMENT <br /> Stream Classifications and Water Quality Standards for State Waters of the Lower Colorado <br /> Basin below Glenwood Springs; the Yampa River Basin below Elkhead Creek; the Green river; <br /> and the entire White River drainage including all tributaries and standing bodies of water <br /> associated with those rivers in all of Moffat, Rio Blanco, Garfield, and portions of Mesa and <br /> Routt Counties. <br /> I. INTRODUCTION <br /> 18 <br />