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II I I II I II I II IIII III Doc Date:121 02111 01 <br />ssa <br />~~. <br />The permit area is located in semi-arid northwestern Colorado and is <br />situated at the headwaters of several intermittent drainages (Map 4). The <br />region in which the permit area occurs is west of the 100th meridian, and local <br />agricultural productivity is strongly influenced by water availability. To meet <br />regulatory requirements, an investigation to identify the impacts of proposed <br />mining activities on alluvial valley floor areas was performed. <br />2.06.8 ALLUVIAL VALLEY FLOORS <br />A reconnaissance-level alluvial valley floor investigation was conducted <br />within a two-mile area surrounding the permit boundary to identify the dynamics <br />of local hydrologic systems and agriculture. <br />The reconnaissance-level investigation was performed in 1976. The investi- <br />gation was designed to determine: <br />. Drainage area that might be affected by mining operations, identified by <br />delineating topographic divides on standard 1:24,000 topographic maps. <br />Extent of stream-laid alluvium shown by existing geologic and soil data. <br />. Areas of historic or present flood irrigation, or irrigation structures. <br />The investigation resulted in a number of conclusions regarding the extent <br />of the alluvial valley floors within the study area and the levels of impact <br />anticipated to result from mining in the Meadows No. 1 permit area. <br />Mining disturbance associated with the Meadows No. 1 mine has occurred in <br />Coal View and Grassy Creek drainages, with most of the surface water runoff <br />being directed to Grassy Creek. The haul road and loadout facility surface <br />water runoff impacts occur in Coal View and Stone House Gulches and the alluvium <br />of the Yampa River. As discussed in Section 2.05.3, the loadout facility and <br />- 393 - <br />(Rev. 5/86) <br /> <br />