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<br />2.0 INTRODIICTION <br />$pdro-Search, Ina. (H5I) was engaged by Powder Horn Coal Company (PCC) to <br />provide a reconnaissance level alluvial valley floor (AVF) investigation of <br />the Rapid and Cottonwood Creeks area ir. western Colorado. The purpose of <br />this investigation was to identify the presence of an AVF based on the <br />geologic, hydrologic, and agricultural setting of the ar ea. The project <br />area is approximately 10 miles northeast of Grand Junction, Colorado, and is <br />immediately east of the Colorado River. <br />As defined by the Colorado Mired Land Reclamation Board (MLR) an AVF is <br />comprised of: <br />• <br />"...unconsolidated stream-laid deposits holding streams with water <br />availability sufficient for subirrigation or flood irrigation <br />agricultural activities but does not include upland areas which <br />are generally overlain by a thin veneer of colluvial deposits <br />composed chiefly of debris from sheet erosion, deposits Pormed by <br />unconcentrated accumulations, and windblown. deposits..." <br />(Colorado Department of Natural Resources, 1980). <br />The criteria used in this investigation to identify an AVF' are: <br />1. the presence of unconsolidated streamlaid deposits which hold <br />streams, and <br />2. the presence of sufficient water to support agricultural activities <br />as evidenced by: <br />the existence of flood irrigation, <br />the capability of an area to be flood irrigated, and <br />subirrigation of the lands in question by the ground-water <br />system of the valley floor. <br />\J <br />3 <br />Hydro-Search, If1C. Reno • Denver • Austin <br />coNw~nr,c r+voRO~ocros~ceo~ac~srs <br />