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• measures. An Emission Permit has been issued by the Colorado Department of Public <br />Health and Environment, Air Pollution Control Division. <br />Environmental Consequences: The addition of the federal coal to the existing mining <br />operation will not cause any additional air quality impairment. Pollutant emissions would <br />be extended an additional length of time necessary to mine the additional coal reserves. <br />Mitigative Measures: None <br />Name of specialist and date: Ole Olsen 5/17/06 <br />AREA OF CRITICAL ENVIRONMENTAL CONCERN <br />Affected Environment: Not present. <br />Environmental Consequences: Not applicable. <br />Mitigative Measures: Not applicable <br />Name of specialist and date: Jim McBrayer- 1/31/2007 <br />• CULTURAL RESOURCES <br />Affected Environment: Cultural resources, in this region of Colorado, range from late <br />Paleo-Indian to Historic. For a general understanding of the cultural resources in this area of <br />Colorado, see An Overview of Prehistoric Cultural Resources, Little Snake Resource <br />Area, Northwestern Colorado, Bureau of Land Management Colorado, Cultural Resources <br />Series, Number 20, An Isolated Empire, A History of Northwestern Colorado, Bureau of <br />Land Management Colorado, Cultural Resource Series, Number 2 and Colorado Prehistory: <br />A Context for the Northern Colorado River Basin, Colorado Council of Professional <br />Archaeologists. <br />Environmental Consequences: The proposed project, Twentymile Coal Company, A <br />Proposed Block for the Coal Lease Modification, has undergone a Class III cultural resource <br />survey: <br />Metcalf, Michael D. <br />2006 Twentymile Coal Company, A Proposed Block for the Coal Lease <br />Modification, Class III Cultural Resource Inventory BLM 54.17.06. Metcalf <br />Archaeological Consultants, Inc. Eagle, Colorado. <br />The survey identified no eligible to the National Register of Historic Places prehistoric <br />cultural resources. The proposed project may proceed as described in this EA with the <br />• following mitigative measures in place..