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significant economic impact; and(4) The Town testified that it was willing to assume the <br /> potential for economic impact in order to protect the quality of this segment as it provides a <br /> significant contribution to the local recreational resources which account for a substantial portion <br /> of the economic base in the region. <br /> In view of the factors that mitigate the near-term potential for economic impact and since the <br /> most likely impacted entity supports this classification, the Commission finds that the <br /> assignment of a class 1 designation is economically reasonable. <br /> 4. Page_2, Segment 10 <br /> This segment receives effluent from the Crested Butte Water and Sanitation District by way of <br /> Woods Creek. Existing aquatic life supports a class 1 cold water classification. A report by <br /> Camp, Dresser, and McKee describes a less expensive alternative to ammonia removal which <br /> could be implemented ammonia as an interim treatment to greatly delay the necessity of <br /> nitrification facilities. The Commission acknowledges that removal will probably be required <br /> for the Crested Butte W& S District's wastewater treatment plant as they reach the maximum <br /> population in their masterplan. Ammonia removal maybe required in the near future, but a <br /> report by Camp, Dresser, & McKee describes a less expensive alternative which could be <br /> implemented. Notwithstanding such improvements, ammonia removal may be required to <br /> provide services for the maximum population projected in the master plan. The Commission <br /> believes that the cost of ammonia removal when it is ultimately required is economically <br /> reasonable because of the large population base which will be available to support this <br /> requirement and the economic importance of recreational fisheries to communities in this area. <br /> 5. Page 3, Segment 12 <br /> In the initial proposal, Segment 12 included the mainstem of Coal Creek from a point <br /> immediately above the confluence with Elk Creek to a point immediately below the Crested <br /> Butte water supply intake. Elk Creek and its tributaries were added to this segment since water <br /> quality sampling indicated that the water quality of Elk Creek and Coal Creek are similar. <br /> Although a recreation class 2 was adopted for this segment a fecal coliform standard of 200 per <br /> 100 m/I was adopted by agreement of the interested parties and because the standards is currently <br /> met. <br /> 6. Pagegment 13 <br /> The Division's initial proposal for this segment was based on four samples taken prior to the <br /> startup of the Amax wastewater treatment facility in July of 1981. This facility treats the <br /> discharge from the inactive Keystone Mine which is the principal point source discharger into <br /> Coal Creek. In view of the significant change in ambient water quality resulting from operation <br /> of the wastewater treatment plant, the Commission in effect adopted the Division's suggestion <br /> that the record on this segment be kept open to receive more meaningful data. The aquatic life <br /> cold water class 1 use classification for this segment is based on ambient flow(Q7-10 = 3.5 <br /> CFS), quality conditions with continuous operation of the Amax wastewater treatment facility, <br /> and presence of aquatic life. These standards include consideration of the existing discharge and <br /> it is not anticipated that additional treatment will be required. Where water quality data was <br /> available, the water quality standards adopted for this segment were developed based upon the <br /> ambient flow conditions and water quality in this segment for those parameters. Only cadmium <br /> and zinc were greater than table values in the 100-200 hardness/alkalinity range. If Crested <br /> Butte fully exercised its decreed water right in Segment 12, the flow in Segment 13 would <br /> essentially be the discharge from the Amax wastewater treatment facility. This flow is in the <br /> greater than 400 hardness/alkalinity range. If, changes in flow conditions occur or if data <br /> 16 <br />