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Evaluation of Potential Subsidence Impacts of Longwall Mining in the Spruce Stomp Lease Area <br />to Aquatic Life and Water Supply <br />4.2.4 Groundwater — Surface Water Interactions <br />Three springs and one stock pond are identified in the 2000 U.S. Department of Agriculture's <br />Final Environmental Impact Statement. These water features are in close vicinity to the Potential <br />Project location, to the south of West Fork Terror Creek. A 2005 USGS report on hydrology of <br />Terror Creek identifies that a significant fraction of stream flow can be located in hypoheric <br />system (Williams, 2005). This report also identifies that Terror Creek has measurable losses of <br />water to groundwater (both in the report's research and as cited from a 1983 study). The report <br />does not identify if losses are into coal seams, geologic fractures or other unidentified <br />formations. <br />4.3 Existing Anthropogenic Influences to West Fork Terror Creek <br />The West Fork Terror Creek watershed is under low to moderate anthropogenic influences, as <br />evidenced by the NFS assignment of an Integrity Class II score for the watershed (Monarch and <br />Associates, 2010). The class scores range from I to IV, with Class I indicative of high integrity <br />and Class IV indicative of higher potential for degradation. <br />4.3.1 Utility Lines (Including Above- and Below- Ground Power Lines, Aqueducts <br />and Water Ditches) <br />The Curecanti -Rifle 230/345 kV electric transmission line runs north/south, roughly parallel to <br />Terror Creek on the west side of Terror Creek. The transmission line crosses West Fork Terror <br />Creek as it continues north past the confluence. The line is owned and operated by the Western <br />Area Power Administration and consists of steel lattice structures with buried reinforced concrete <br />bases (U.S. Department of Agriculture, 2000). Taking into account access roads, the <br />transmission line has a 125 foot wide right -of -way and is protected from mining impacts. <br />4.3.2 Roads and Railroads <br />In the Potential Project area, two roads cross West Fork Terror Creek. An unpaved road (41.75 <br />Dr/FR 824) runs through the Terror Creek Winery before following the main stem of Terror <br />Creek. This road crosses West Fork Terror Creek near the downgradient terminus of the <br />121 - 014.000 Wright Water Engineers, Inc. Page 14 <br />January 2013 <br />