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2023 Cultural Resource Site Assessments for Collom Expansion Project Colowyo <br />Tetra Tech June 2023 18 <br />For Official Use Only: Disclosure of Site Locations Prohibited (43 CFR 7.18) <br /> <br />Figure 11. Site 5MF.4008 overview with flooding, facing north. Taken by E. Shikrallah on <br />5/17/2023. <br />5MF.4010 – Prehistoric Lithic Scatter, Needs Data <br />Site 5MF.4010 was originally recorded in 1995 by Metcalf Archaeological Consultants for the <br />Colowyo Coal Company Lease and Exploration Areas: Class III Cultural Resource Inventory <br />project. The site consists of a prehistoric lithic scatter of approximately 35 white chert flakes along <br />a cutbank on the west side of Wilson Creek. Five to 10 flakes were observed in situ in the side of <br />the cutbank and about 25 flakes were discovered in redeposited sediment directly underneath. <br />The site has been revisited twice since the original recording. It was revisited in 2005 by TRC as <br />part of the Collom Mine Expansion Class III Inventory project and in 2015 by Tetra Tech as part <br />of the Collom Mine Expansion Site Assessment project. TRC relocated the in-situ flakes as well <br />as the redeposited sediment with the previously reported flakes in 2005. TRC also reported an <br />additional five flake concentrations in-situ along the cutbank along with charcoal flecks and a <br />possible biface. <br />In 2015, Tetra Tech revisited the site as part of the Collom Mine Expansion Site Assessment <br />project. One of the white chert tertiary flake clusters was relocated on the eroded slope below the <br />cutbank. No in-situ flake localities were found. The cutbank had undergone heavy erosion <br />compared to 2005. Originally reported flake localities are likely buried under the constantly <br />eroding sediment. A slump event was discovered in the center of the site at the location of the <br />original in-situ flake location. The slump measures approximately 5 m by 5 m. However, no <br />evidence was observed that the erosion has removed the potential for an intact subsurface <br />cultural component(s) at the site. <br />In 2019, Tetra Tech revisited the site as part of the second round of assessments. The site <br />appeared to be in similar condition as the 2015 assessment. No new major slump events had