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<br />.'J. Surface water supplies must he developed to meet the anticipated <br />water quality and quantity needs if economic development is to <br />occur. <br /> <br />4. Before any recreational use is permitted of Ridgway Reservoir, <br />the City of 'Ouray, Colorado, must provide secondary treatment <br />df'its sewage. <br /> <br />5. Annual:average concentrations of total dissolved solids will <br />be reduced about 5% at Coloria and increased about 30% at Delta <br />under project operation. <br /> <br />'6. The combined flow of the Uncompahgre River above Ridgway, <br />DaUasCreek and diversions from Cow Creek stored in Ridgway <br />Reservoir will provide a raw water s\1pply for municipal purposes <br />meetingthePliblic Health Service Drinking Water Standards. <br />Calculations indicate that expected concentrations of sulfate, <br />total dissolved solids and hardness would be about 150 mg/l, <br />300 mg/l, and 200 mg/l, respectively. <br /> <br />7. As heavy metals previously precipitated in the Ridgway Reservoir <br />will go back into solution under anaerobic conditions a two-level <br />municipal water supply intake is recommended at Ridgway Reservoir. <br />This wilt provide greater flexibility in operation of the intake <br />!', and permit drawing-off of the better quality water. <br /> <br />8. Consideration should be given by the Bureau of Reclamation to' <br />inclusion of Irontan Park Reservoir in the Dallas Creek Project <br />to bring about a reduction in acid mine drainage pollution. In <br />addition to intangible benefits associated with the domestic <br />water supply, this reservoir would provide tangible water quality <br />benefits for fishing and recreation amounting to $49,300 annually. <br /> <br />9. Based upon hiEltorical streamflow data, 1939-.62,. existing water <br />quality could be maintained at Delta under project conditions <br />about 20 percent of the time if monthly flows shown in Column 8 <br />of Table XI are provided, Historical streamflows are insufficient <br />to maintain 1,000 mg/l of total dissolved solids at Delta, wit~oue <br />or with the Dallas Creek Project. Existing evidence does not <br />jus.ttfy the inclusion of water supply storage in Ridgway Reservoir <br />for regubtion af streamfiow for the purpose of water quality <br />control in the Uncompahgre River, therefore, no monetary value <br />hall been 4ss.i8ned. <br /> <br />4 <br />