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<br />discharging to the <br />Arkansas River, Lake <br />Creek water moves <br />through Twin Lakes <br />Reservoir, which stores <br />trans-basin diversion <br />water for the Colorado <br />Springs water supply. <br />Water sampling will cor- <br />relate stream water quali- <br />ty to mineral types iden- <br />tified in the altera tion <br />areas and downstream. <br />Mineral types will be <br />identified through hyper- <br />spectral remote sensing <br />data and "ground-truth" <br />spectral data collected in <br />the field using hand-held <br />spectrometers. <br />Phase 2 will compare <br />Lake Creek, primarily <br />affected by natural acid <br />rock drainage, wi th the <br />upper Arkansas River, <br />primarily affected by <br />impacts from historic <br />mining districts in the <br />Leadville area. Much <br />work has been done in identifying, <br />characterizing, and remediating <br />mining-induced contaminants in <br />the Leadville area (USEPA, 2002). <br /> <br /> <br /> <br />o <br />I <br /> <br />5 <br />I <br /> <br />10Mi <br />I <br />I <br />15 Km <br /> <br />I <br />s <br /> <br />I <br />10 <br /> <br />o <br /> <br />) <br />" <br />~ Mt Sherman <br /> <br />\ <br />< <br />1 <br />\ <br />. Weston <br />Pass <br /> <br />PITKIN CO <br /> <br />N <br /> <br />~ <br /> <br />{ <br />GRIZZL Y '{ <br />PEAK . <br />CALDERA <br /> <br />PARK CO <br /> <br />CHAFFEE CO <br /> <br />(lrM <br /> <br />Mt Befford .. <br /> <br />.. Mt Oxford <br /> <br />Diagram of the Phose 1 <br />Watershed Project <br /> <br />and phose 2 study areas of the Upper Arkansas River <br /> <br />Project Description <br />Phase 1 of the project focuses on <br />areas that exhibit natural acid <br />rock drainage, specifically, the <br />South Fork Lake Creek <br />watershed and Lake <br />Creek downstream of <br />the South Fork conflu- <br />ence. The South Fork <br />watershed contains <br />two areas of <br />hydrothermal alter- <br />ation, Red Mountain <br />(photo) and East Red <br />Mountain, which drain <br />acidic, metal-laden <br />water to Peekaboo <br /> <br />Gulch and Sayres Gulch. Metals <br />and acidity derived from these <br />areas affect water quality far <br />downstream in Lake Creek. Before <br /> <br />'" <br /> <br />Hydrothermally altered <br />rocks of Red Mountain <br />in the heart of the <br />Grizzly Peak Caldera. <br />Springs here discharge <br />very acidic (pH~2-5), <br />metal-rich water. <br /> <br />Colorado Geological Survey ROCKTALKVol. 5, No. .4 <br /> <br />~ <br /> <br />f" <br /> <br />, <br /> <br />~ <br />I <br /> <br />13 <br />