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<br />INTRODUCTION <br />This report presents the r=_sults of a study which addresses <br />a se*_ of alluvial valley floor (AVF) issues pertaining to the <br />Unit Traia Loadout (UTL) Site at Powderhorn Coal Company's Cameo <br />Mine. The principal objective of the study is to investigate the <br />occurrence (and extent, if found) of subirrigation at the UTL <br />Si*_e. This report oresents results with respect to these subirri- <br />gation investigations and also discusses these findings in terms <br />of the Rules and Regulations of the Colorado Mined Land <br />Reclamation Board. Significance. to farming, flood irrigation, <br />preservation of essential hydrologic functions, and monitoring <br />• are also discusse3 in the report. <br />SUB IRRIGATION DETERMINATION <br />The UTL Site is located near the Cameo Mine on a terrace <br />imme3iately adjacent to the Colorado River. In order to <br />determine if subirrigation is occurring at the site, three (3) <br />test pits were excavated on the terrace in the rail loop ar=_a <br />(See Exhibit I - Alluvial Valley Floor Reconnaissance Level <br />Survey). <br />At each test pit location, observations were made of soil <br />moisture, abundance of roots by number and size, soil texture, <br />and the presence of mottling and gleying. In addition, the <br />species of vegetation at each site were noted and the elevation <br />• of the static water level was de*_ermined. Pit descriptions are <br />provided in Appendix A. (It should be noted that the pits stood <br />