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-v- <br /> occur. Therefore, i t is the Division's position that since few, if any, <br /> additional impacts will occur to the essential hydrologic functions of the <br /> M- subject alluvial valley floors as a result of operations proposed in this <br /> application, the permit should be issued as long as the applicant commits to <br /> submitting a plan for restoration of the essential hydrologic functions of <br /> the subject alluvial valley floors after mining. The following stipulation <br /> is necessary: <br /> THE APPLICANT MUST, WITHIN ONE YEAR OF THE PERMIT ISSUING, SUBMIT A <br /> PLAN TO THE DIVISION FOR RESTORING THE ESSENTIAL HYDROLOGIC FUNCTIONS <br /> OF THE STEVENS GULCH AND NORTH FORK OF THE GUNNISON ALLUVIAL VALLEY <br /> FLOORS. THIS PLAN SHALL IDENTIFY THE ESSENTIAL HYDROLOGIC FUNCTIONS <br /> OF THESE TWO ALLUVIAL VALLEY FLOORS AND MUST SHOW IN ADEQUATE DETAIL <br /> HOW THE ESSENTIAL HYDROLOGIC FUNCTIONS WILL BE RESTORED. <br /> VIII. WATER RIGHTS AND REPLACEMENT (2.04.7(3) , 2.05.6(3) (ii) , 2.07.E(2) (c) , <br /> 4.05.15) <br /> The Orchard Valley mine consumes approximately 30,000 GPD for use at the mine. <br /> This water supply is drawn from a well- field which taps the alluvium of <br /> Stevens Gulch. This removal of water from Stevens Gulch could affect the <br /> flows in the North Fork of the Gunnison River which Stevens Gulch is tributary <br /> to, and so the applicant has obtained an approved augmentation plan through <br /> Division 4 Water Court to replace water removed from Stevens Gulch. Please <br /> refer to the Augmentation appendix in Volume 2 of the application. The plan <br /> uses releases from East Beckwith No. 1 Reservoir, located in the Anthracite <br /> drainage, to compensate for any injury to other vested water rights or, <br /> for this purpose, the North Fork alluvium. This plan is discussed on page 72, <br /> Section 2.04 of volume 8 of the application. <br /> There were no concerns raised by the Division regarding the water rights and <br /> replacement sections of the application during the review process, and as such, <br /> the proposed operation is in compliance. <br /> IX. PROBABLE HYDROLOGIC CONSEQUENCES AND CUMULATIVE IMPACT ASSESSMENT <br /> (2.05.6(3) , 2.07.E(2) (c)) <br /> Regional Geology and Ground Water Hydrology - General Area <br /> The Orchard Valley mine lies on the southeast margin of the Piceance Basin. <br /> Sedimentary rocks ranging from late Cretaceous to early Tertiary age, and <br /> dipping 5 percent North, are exposed in the mine areas. Structural-strati- <br /> graphic cross-sections are presented on Maps 41, 42 and 44 in Volume 9, and <br /> the mine area geology is presented on Map 49. <br /> Coal is to be produced from the- Mesa Verde Formation, a 2,500-foot-thick sequence <br /> cf Sed_re::ta_-: beds overlain by the Ohio Creek Congolomerate and underlain by <br /> the ±fancos S':ale. The Mesa Verde Formation is composed of four members; <br /> t-:e Sandstone, the Upper and Lcr.:er Coal members, and the "Barren„ <br /> riember. <br />