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<br />D. ALLUVIAL VALLEY FLOORS <br />1. INTRODUCTION <br />Colorado Regulations Section 2.06.8(3)(b} states that; "Before <br />applying for a permit or in conjunction with an application for <br />a permit to conduct, or before conducting surface coal mining <br />and reclamation operations within a valley holding a stream or <br />in a location where the adjacent area includes any stream, the <br />applicant shall either affirmatively demonstrate, based on avail- <br />able data, the presence of an alluvial valley floor, or submit <br />to the Division the results of afield investigations of the <br />proposed permit area and adjacent area". The regulations (Section <br />• 1.04(10)) further define alluvial valley floors as "unconsolidated <br />streamlaid deposits holding streams with water availability suf- <br />ficient for subirrigation or flood irrigation agricultural activi- <br />ties but does not include upland areas which are generally over- <br />lain by a thin veneer of colluvial deposits composed chiefly of <br />debris from sheet erosion, deposits formed by unconcentrated <br />runoff or slope wash, together with talus, or other mass-movement <br />accumulations, and windblown deposits". The existence of an allu- <br />vial valley floor is, therefore, determined to exist if: <br />(i) Unconsolidated streamlaid deposits holding streams are <br />present; and <br />(ii) There is sufficient water to support agricultural activities <br />as evidenced by: <br />• <br />II.D-1 <br />4-81 <br />