2017-09-11_PERMIT FILE - C1981019 (3)

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Cultural Resource HPTP for MK -1-082317 and MK -2-082317 Colowyo Coal Company 2.0 SITE DISCOVERY BACKGROUND On August 23, 2017 Tetra Tech's cultural resource monitor observed two separate site discoveries within the Project haul road on either side of County Road 51. Both discoveries were flagged off with a 100 foot (ft) [30 meter (m)] avoidance buffer in accordance with the Cultural Resource Protection Plan. On August 24, 2017 Tetra Tech provided Colowyo with a discovery report with preliminary OAHP site forms, maps, and photographs. The report and site forms detail the finding in conformance with Discovery Notification section of Exhibit 5, Item 3 - Cultural Resource Protection Plan for the Collom Mine Expansion. 2.1 MK -1-082317 The discovered site is two thermal features approximately 20 cm below surface within the haul road immediately west of County Road 51. Feature 1 is a circular thermal feature of stained soil, charcoal flecking and heat altered rock. The feature measures 60 by 55 centimeters (cm) (Figure 5). Feature 2 is a circular thermal feature of stained soil and heat altered rock. The feature measures 1.1 m by 90 cm .While the upper portion of each feature was likely removed during ground stripping the remaining portions of each appear to be intact (Figure 6). No other cultural material or intact sediments remain at the location. The horizontal extent of the site appears to be limited to the two features within the disturbance area. The discovery is recommended eligible for inclusion on the National Register of Historic Places (NRNP). The site cannot be avoided; therefore Tetra Tech recommends data recovery be conducted on the two features, limited testing in the feature vicinities, and monitoring of remaining ground stripping at the location afterward. Figure 5. Site MK -1-082317, Feature 1, Discovery Photography. Facing North. fir, -3 -?cn 4:a5c,sr 3�, ;�-