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<br />State I ine approaches 1200 mg/I. <br /> <br />~ Combinations of feedlot manure and fertilizer use contribute to ground- <br />CJl <br />CJl water nitrate problems on sandy alluvial soils. Solid waste disposal sites <br />'1 <br />cause localized, although potentially serious, groundwater problems. <br /> <br />The main stem Is used for drinking water essentially to Denver and the <br /> <br />tributaries to Denver on Clear Creek, to Loveland on the Big Thompson, to Fort <br /> <br />Collins and Greeley on the Cache La Poudre and to Lyons on the St. Vrain. Some <br /> <br />alluvial ground water supplies are affected by the stream, but this effect is <br /> <br />not expected to be critical In relation to compliance with the Primary Drink- <br /> <br />ing Water regulations. <br /> <br />Republican Bas in <br /> <br />The Republican Basin lies along the eastern border of Colorado. Most <br /> <br />streams are intermittent. The North Fork and South Fork of the Republ ican <br /> <br />support high quality fisheries. The most significant water quality problem is <br /> <br />col iform violations associated with I ivestock feeding operations. The ground- <br /> <br />water quality of the basin Is excellent. Heavy use of the Ogallala aquifer <br /> <br />presents a potential water quantity supply problem. <br /> <br />Arkansas Bas in <br /> <br />The Arkansas River drains the southeastern quarter of the State. It begins <br /> <br />in the mountains near Leadville and empties into Kansas east of Lamar. The <br /> <br />Arkansas basin is second to the Platte in population and amound of industry, <br /> <br />containing Colorado Springs, Pueblo, (the State's largest steel mill), sugar <br /> <br />beet processors and feedlots. <br /> <br />The Upper Arkansas contains high levels of toxic metals from abandoned <br /> <br />mines. Dilution permits the maintenance of ahlgh qual ity fishery in the main <br /> <br />II - 2 <br />