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4-6 <br />4.1.2.6 Preliminary Identification Of Alluvial Valley Floor <br />• Grand Valley has completed a preliminary identification of the alluvial valley floors in the <br />vicinity of the proposed operations. The area of study covers the valley of East Salt Creek from <br />a point located approximately half a mile north of the confluence of the unnamed channel in <br />McClave Canyon and East Salt Creek to a point approximately half a mile below the mouth of <br />Munger Canyon. The study also includes side valleys on both sides of East Salt Creek valley. <br />METHOD OF STUDY <br />The preliminary identification of alluvial valley floors was performed in two phases: <br />Office Study and Review of Aerial Photographs. <br />Two sets of low altitude color photographs and one set of infrared aerial photographs <br />were studied preliminary to the field work. <br />Field Reconnaissance and Mapping. <br />Field work was accomplished to delineate the alluvial valley floors and other geomorphic <br />• units in the area. The graphical presentation of AVF identification has been made on a <br />USGS. topographic map on the scale of 1:24,000 which should prove to be a sufficient <br />scale for the purpose of study. The use of the USGS. map for this purpose is in <br />accordance with the Region V Office of Surface Mining Guidelines dated June l I, 1980. <br />Geomorphic mapping of the area and the evaluation of the AVF were supplemented by <br />the excavation of five test pits located at different points, mostly in side valleys of the <br />East Salt Creek. In addition to these test pits, results of ground water measurements <br />from four monitoring wells located close to the confluence of the Munger Creek were <br />used for the purpose of the study. <br />• <br />M~ Volume 1 4 -29 - 96 <br />