Laserfiche WebLink
-3- <br /> 1980 and April 27, 1981 Preliminary Adequacy Reviews of the permit application <br /> have been satisfactorily resolved and the proposed operation is in compliance. <br /> VI. HYDROLOGIC BALANCE: GROUND WATER (2.04.5, 2.04.7, 2.05.3(4) , 2.05.6(3) , <br /> 4.05 <br /> For a description of the groundwater hydrology of the mire area and a dis- <br /> cussion of the impacts of mining on groundwater, please refer to the Regional <br /> Geology and Groundwater Hydrology portion of Section IX, Probable Hydrologic <br /> Consequences and Cumulative Impact Assessment of this document. <br /> The groundwater sections of the permit application, found on pages 55-77 of <br /> Section 2.04 of Volume 8, pages 126-163 of Section 2.05 of Volume 8A, and in <br /> the groundwater appendix of Volume 2 have been reviewed by the Division. All <br /> concerns pertaining to groundwater hydrology which were raised in the December <br /> 2, 1980 and April 27, 1981 Preliminary Adequacy Reviews of the permit applica- <br /> tion have been satisfactorily resolved and the proposed operation is in com- <br /> pliance. <br /> VII. ALLUVIAL VALLEY FLOORS (2.06.8, 4.24) <br /> The general area in which the Orchard Valley mine is situated contains several <br /> deposits of alluvium, as shown on Map No. 40. These alluvial deposits are <br /> made up of 3 types of alluvium: 1) Flood-plain alluvium (Qal) along the North <br /> Fork of the Gunnison River; 2) Valley-fill deposits (Qvf) along a portion <br /> of Stevens Gulch; and 3) Alluvial gravels (Qag) divided into 3 age categories <br /> (younger (Qagy) , middle (Qagm) and older (Qago)) . These deposits are located <br /> t along the North Fork Valley side slopes. <br /> Colorado Westmoreland has some of it's existing surface facilities located within <br /> these areas of alluvium, as shown on Map No. 40, Alluvial Valley Floor Reconais- <br /> sance Level Investigation. Other information on the alluvial valley floor <br /> aspects of the mine can be found on pages 15-23, Section 2.06, Volume 8A of <br /> the application and in the Alluvial Valley Floor appendix of Volume 4. <br /> Identification of Alluvial Valley Floors <br /> The applicant has identified, on Map No. 40, three areas within or adjacent to <br /> the proposed life of mine area which may meet the geomorphic criteria of alluvial <br /> valley floors. Alluvial deposits were identified in the Morrell Cow Camp area <br /> which is tributary to Terror Creek, along Stevens Gulch and along the North <br /> Fork of the Gunnison River. <br /> One of these areas, the Morrell Cow Camp area, although geographically adjacent <br /> to the permit area, is not hydrologically adjacent to the activities being <br /> reviewed in this permit application. The northerly downdip of the strata, the <br /> lack of water encountered in drill holes just to the North of the permit boun- <br /> dary, the depth of overburden (1500-2000') , and the presence of a surface water <br /> divide between the permit area and the Morrell Cow Camp area indicate a hudro- <br /> _ =-- =_a:_cn frc- t.=e area to be per..ritted. As such, a formal determination <br /> for this area will not be r..ade at this time. When the applicant submits an <br /> application that proposes mining activities within either the surface watershed <br /> or groundwater system for this area, the Division will make the required <br /> alluvial valley floor determination. <br /> �„ <br />