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Cultural Resource .Historic Properties Treatment Plan for BK -2-082818 Colowyo Coal Company <br />wv� �� ,t •- ; 9-�. - - <br />4 <br />}A:• .r i <br />7 <br />�:J` �� �,1, '•' �Ia ice` ��V .I� 'Y �.' is <br />f <br />L� <br />re <br />j: <br />vX,1 , <br />�. <br />-10 <br />Figure 2. Site BK -2-062518; Feature 1: Possible Thermal Feature, Facing North. <br />2.0 SITE BK -2-062518 DISCOVERY BACKGROUND <br />On June 25, 2018 Tetra Tech's cultural resource monitor was observing topsoil stripping activities <br />associated with the construction of the haul road County Road 51 overpass culvert to the west of <br />Wilson Creek. Within the planned disturbance area, the monitor observed a possible prehistoric <br />thermal feature located at approximately 20 cm below ground surface. The monitor immediately <br />halted ground disturbance in the vicinity of the discovery. Further inspection collected preliminary <br />data about the thermal feature and identified five heat altered rock pieces. The monitor flagged <br />off a 100 -foot (30 m) avoidance buffer around the finding and recorded all observed material. <br />On June 26, Tetra Tech provided Colowyo with a discovery report detailing the finding in <br />conformance with Discovery Notification section of Exhibit 5, Item 3 -Cultural Resource Protection <br />Plan for the Collom Mine Expansion. Colowyo submitted the Discovery Notification to OSMRE, <br />Colorado Division of Reclamation, Mining, and Safety (DRMS) and the Office of Surface Mining <br />and Enforcement (OSMRE) for their review and determination whether the site is significant-, <br />therefore, requiring additional work. <br />3.0 TREATMENT METHODOLOGY <br />Tetra Tech developed the following Treatment Methodology based on our prior experience <br />working with similar sites within the project and throughout the region. The methodology is based <br />on OSMRE's HPTP outline provided to Tetra Tech during previous HPTP's development in 2017 <br />for the Project. <br />Tetra Tech June 29, 2018 <br />