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<br />VII-7 <br /> <br />. <br /> <br />Roaring Fork River <br /> <br /> <br />The Roaring Fork River has higher quality water in general than the <br /> <br /> <br />Crystal River. The hardness of the Roaring Fork is in the range of ZOO <br /> <br /> <br />ppm. The Roaring Fork Rive( is lower in elevation than the Town and <br /> <br /> <br />pumping would be required to get the water into the Town's system. Treat- <br /> <br /> <br />ment in this case would also require a filtration plant. <br /> <br />The Town does not have water rights on the Roaring Fork River, but the <br /> <br /> <br />present Town rights on the Crystal could be changed to the Roaring Fork <br /> <br /> <br />with little difficulty. The major drawback for this source is the capital <br /> <br /> <br />cost for pumping and treatment and the operational cost of both faci lities. <br /> <br />GROUND WATER <br /> <br />. <br /> <br />To understand the ground water hydrology in the Carbondale area, it is <br /> <br /> <br />necessary to review the overall geologic nature of the area. Geologic units <br /> <br /> <br />in the Carbondale area cover a wide range, both in composition and geologic <br /> <br /> <br />age. Most of the rocks that outcrop in the study area are sedimentary with <br /> <br /> <br />some localized igneous and metamorphic outcroppings. The river valleys are <br /> <br /> <br />filled with erosional material derived from the diverse bedrock material <br /> <br /> <br />through precipitation runoff, river,and glacial erosion. <br /> <br />The geologic strJcture of the study area is generally east-northeast dipping <br /> <br /> <br />sedimentary beds. A major fault is located along the Roaring Fork River and <br /> <br /> <br />trends southeast-northeast. <br /> <br />Two types of aquifers have been noted in the Carbondale area; unconsolidated <br /> <br /> <br />alluvial aquifers and consolidated sedimentary bedrock aquifers. Both types <br /> <br /> <br />of aquifers have been tapped in the area and have exhibited varying water <br /> <br /> <br />supply characteristics, both quantitatively and qual itatively. The tributary- <br /> <br /> <br />non-tributary nature of these sources also varies depending upon the type of <br /> <br /> <br />aqui fer and location. <br /> <br />. <br /> <br />Consolidated Bedrock Aquifers <br /> <br /> <br />The bedrock formations in the study area consist principally of shales with <br /> <br /> <br />interbedded conglomerates, sandstones, and limestones. Few wells have been <br />