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Based on presently available information, including information provided in the permit <br />application and field reconnaissance by Division staff, the following stream valley segments <br />have been determined to be alluvial valley floors: <br />• Good Spring Creek valley deposits mapped as Qa on Map 11A, extending from the West <br />Fork Good Spring Creek confluence downstream for the entire length of the valley. <br />• Upper segment of Wilson Creek valley deposits mapped as Qa on Map 11A, from the <br />confluence of East and West Forks of Wilson Creek, downstream to the approximate <br />center of Section 7, T3N, R93W. (Area extending downstream of this point for several <br />miles, delineated on Map I IA as "Affected by 1985 Erosion and Mass Wasting Event", <br />has been determined by the Division not to be an alluvial valley floor). <br />• Lower segment of Wilson Creek valley deposits mapped as Qa on Map I IA, extending <br />from iV YY er bV µildary of "Area Af1N?ted by 19Q5 ErVJ1V11 an %d IVI 4ass VYTaJt111g Evellt", 111 <br />SE '/ of Section 21, T4N, R93W downstream for the length of the valley. <br />• Lower Elkhorn Creek valley deposits mapped as Qa on Map I IA. <br />• Jubb Creek and its tributary valleys with deposits mapped as Qa on Map 1 IA. <br />Stream Valley Segments Determined Not to be Alluvial Valley Floors <br />Taylor Creek was investigated in the early 1980s in association with initial permitting of <br />Colowyo, and was determined not to be an alluvial valley floor. The West Fork of Good Spring <br />Creek was investigated in association with PR-2, and was determined not to be an alluvial valley <br />floor. A middle segment of Wilson Creek within the expanded permit boundary was <br />investigated in association with PR-2. The segment had originally been designated an alluvial <br />valley floor, but based on information presented in the PR-2 application and field reconnaissance <br />by Division staff, the Division has determined that the segment no longer meets the alluvial <br />valley floor criteria. These valley segments are discussed in more detail below. <br />Taylor Creek <br />Lower Taylor Creek, a tributary to Wilson Creek, contains small areas with alluvial deposits but <br />does not contain enough water to provide for sub-irrigation of croplands. Taylor Creek, which <br />will be mined in its upper reaches, is therefore not considered an alluvial valley floor. <br />West Fork Good Spring Creek <br />West Fork of Good Spring Creek contains a narrow band of alluvial deposits. The alluvial <br />deposits along the West Fork extend approximately two miles upstream from the confluence <br />with the East Fork (which forms the main stem of Good Spring Creek). Mining of the South <br />Taylor pit within the southern portion of the proposed Permit Revision 02 permit expansion area <br />will occur within the watershed of the West Fork, and the pit bottom orientation is such that <br />ground water from the pit will eventually discharge into the West Fork. It is projected that water <br />Proposed Decision and Findings of Compliance 14 September 2009 <br />Permit Renewal 05 Page 69