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<br />4. The protection of fish and wildlife and water supply uses are the <br />major water quality problems- in the Lower Colorado River, Salt Creek, Dolores <br />River, Upper Colorado River, Plateau Creek, White River, Yellow Creek, <br />Stewart Gulch, Gunnison River, and Piceance Creek Subbasins. These orohlems <br />are typically the result of excessive concentrations of heavy metals, sulfates, <br />alkalinity, TOS, and T5S. <br />5. The Crystal River, Roan Creek, Douglas Creek, Coal Creek, and Para- <br />chute Creek Subbasins have limited water quality problems. These problems <br />include excessive concentrations of TDS, alkalinity, and sulfates threatenin~ <br />the use of these waters for water supply and fish and \1ildlife habitat. <br />6. The South Fork of the White River and the Roarinq Fork Subbasins <br />appear to be the most pristine, problem-free water courses in the Study Area. <br />7. The establishment of the causes of various water quality problems <br />was limited by the lack of comprehensive land use data. <br />8. Current EPA studies relative to toxicity problems on the Colorado <br />River near Grand Junction will determine the viability of uses in that area. <br />9. Throughout the Study Area, the most prevalent water quality problems <br />are derived from natural geologic conditions and in some areas, man-induced <br />runoff. Pollutants in this category include alkalinity, aluminum, chlorides, <br />iron, manganese, silver, sodium, sulfates, TOS, T55, and zinc. <br />10. t1ining activities may be responsible for excessive concentrations <br /> <br />of Ludum, cadmium, lead, mercury, f7101ybdenUlry, TS5, ant! ZiDC. <br /> <br />11. Agricultural activities cause excessive concentrations of arsenic, <br />lead, N03-N, and TDS. <br />12. Point source (municipal/dof71estic wastewater discharges) problems are <br />limited to fecal coliforms and MH3-M. <br /> <br />002997 <br /> <br />- f - <br />