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XVII. Auger Mining <br />The requirements of this section do not apply. <br />XVIII. Operations on Alluvial Valley Floors <br />Alluvial Valley Floor Identification <br />Information pertinent to alluvial valley floor (AVF) determinations is provided in the permit <br />application on pages 2.06-6 through 2.06-25.4, Exhibit 42a (EMD Alluvial Valley Floor <br />Determination), Map No. 5 (Surface Geology), Map No. 15 (Alluvial Valley Floors, Land Use and <br />Water Rights), and the supplemental report of September 22, 1986, "Material Damage Standazd for <br />Irrigation", and Map No. 13 (Twentymile Park Hydrology). <br />Potentially affected portions of Foidel Creek, Middle Creek, Fish Creek and Lower Trout Creek stream <br />valleys have previously been evaluated with respect to AVF criteria in a number of coal permits, <br />including Twenrymile Coal Company's Foidel Creek Mine (C-82-056), Twentymile Coal Company's <br />Fish Creek Tipple (C-81-036), Colorado Yaznpa Coal Company's Eckman Pazk, Mine No. 1, and Mine <br />No. 2 (C-81-071) and Colorado Yampa Coal Company's Energy Mine No. 3 (C-84-062). <br />Numerous azeas meeting the criteria for potential AVFs exist in the permit and adjacent azea. The <br />Division has made the fmding of the presence or absence of AVFs as detailed in the following <br />sections. <br />AVF Determination -Positive Determination <br />Fish Creek <br />Based on existing and potential flood irrigation and subirrigation capabilities, the Division has <br />determined that Fish Creek is an AVF above, within, and below the permit azea, downstream to its <br />confluence with Trout Creek. This azea is delineated on Map 15 of the permit application, Alluvial <br />Valley Floors and Water Rights. PR-OS approved expansion of the mine plan into the Northern <br />Mining District (longwall panels 12 Right to 16 Right) which underlies the Fish Creek AVF. PR-06 <br />proposes further undermining ofthe AVF by panels 17 Right and 18 Right. <br />Trout Creek <br />Alluvial deposits on Trout Creek meet alluvial valley floor criteria based on extensive acreage of flood <br />irrigated hayland, potential for flood irrigation and a presumed capability to support subvrigated <br />vegetation. The Division has determined that Trout Creek is an AVF as delineated on Map 15. <br />Foidel Creek/Middle Creek Confluence <br />The alluvial body at the confluence of Foidel Creek and Middle Creek, extending from the County <br />Road No. 33 crossing of Middle Creek, upstream on both Foidel and Middle Creeks, to the first Trout <br />Creek irrigation diversion ditch, does meet alluvial valley floor criteria based upon existing flood <br />irrigation and a presumed capability to support subirrigated vegetation. This azea is also delineated on <br />Map 15 of the permit application. PR-OS approved undermining a portion of the AVF on Foidel <br />Creek. <br />25 <br />