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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 />negatively impact the quality of the aquatic habitat of the Potential Project area. Based on this <br />analysis, adverse impacts to aquatic life are not expected as a result of the Potential Project. <br />3.0 INVESTIGATION APPROACH <br />The overall strategy of the investigative approach was to: (1) characterize West Fork Terror <br />Creek in the Spruce Stomp Lease Area with emphasis on the existing physical, chemical and <br />biological conditions; (2) predict likely subsidence effects resulting from the Potential Project <br />using geologic modeling; and (3) consider the existing condition of West Fork Terror Creek and <br />the likely subsidence effects to assess expected impacts to aquatic life, particularly cutthroat trout <br />(Oncorhynchus clarki). <br />The investigation emphasized the use of existing published and readily available information <br />including Environmental Impact Statements, Biological Assessments, Conservation <br />Assessments, U.S. Geologic Survey information (including topography, geologic mapping and <br />hydrology), information obtained from other coal mines in the vicinity and information provided <br />by Bowie Resources personnel. For a complete list of reviewed materials, please see the Cited <br />Resources in Appendix 1. <br />In addition to a review of existing materials, the investigation included the following data <br />collection efforts: <br />0 Biologic baseline monitoring activities, including: <br />• Fish sampling (density, mass and genetics); <br />• Benthic macroinvertebrate sampling; and <br />• Physical stream habitat inventory. <br />• Light Detection And Ranging (LiDAR) 2' elevation contour mapping. <br />• Geographic Information System (GIS) mapping and spatial analysis. <br />• Development of West Fork Terror Creek channel profile using LiDAR elevation <br />information. <br />121 - 014.000 Wright Water Engineers, Inc. Page 2 <br />January 2013 <br />