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Impacts to Alluvial Valley Floors (AVFs) -Hay Gulch meets the regulatory definition of an alluvial <br />valley floor. Mining operations at the La Plata Mine did not disturb the alluvium in Hay Gulch. The <br />previously described absence of adverse hydrologic impacts to Hay Gulch surface water and <br />alluvium indicate the essential hydrologic functions have been preserved by maintaining the <br />geologic, hydrologic, and biologic characteristics that support those functions. <br />Comaletion of the Hvdroloeic Reclamation Plan <br />All ditches, ponds, and monitoring wells have been reclaimed. <br />Findines on Protection of Hvdroloaic Balance <br />All hydrologic structures has been reclaimed and there is no water pollution occurring. All of the <br />observed hydrologic impacts are consistent with those predicted in the Division's La Plata River <br />Cumulative Hydrologic Impact Assessment. Based on the foregoing observations, the Division <br />finds that the La Plata Mine has minimized disturbance of the hydrologic balance in the mine plan <br />and adjacent areas, and prevented material damage outside the permit area. The Division also finds <br />that the La Plata Mine has not caused hydrologic changes that adversely affect the approved <br />postmining land use in the permit area. <br />4 <br />