2017-08-29_GENERAL DOCUMENTS - C1981019

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Tetra Tech 4750 West 2100 South, Suite 400, Salt Lake City, UT 84120 Tel 801.975.6284 Fax 801.364.2021 www.tetratech.com August 24, 2017 Subject: Cultural Resource Discoveries MK-1-082317 and MK-2-072617 at the Colowyo Collom Expansion Project, Moffat County, Colorado To whom it may concern, The following two cultural resource discoveries (MK-1-082317 and MK-2-082317) were encountered as part of ongoing cultural resource monitoring activities associated with the Collom Expansion Project (Project). The High Potential Area (HPA) cultural resource monitoring is being conducted as stipulated per the Cultural Resource Protection Plan developed for the Project. The following report is provided as part of the Discovery Reporting section outlined in the same plan. Attached to this memo are preliminary OAHP site forms for each discovery with supporting photographs and figures. The monitor flagged off both discoveries with a 100 foot (30 m) avoidance buffer in accordance with the Cultural Resource Protection Plan. MK-1-082317 On August 23, 2017 Tetra Tech’s cultural resource monitor observed two thermal features approximately 20 cm below surface within the haul road immediately west of Country Road 51 . No surface cultural resource material was observed at the location prior to the commencement of the disturbance. While the upper portion of each feature was likely removed during ground stripping the remaining portions appear to be intact. No other cultural material or intact sedimen ts remain at the location. The horizontal extent of the site is limited to the two features within the disturbance area. The discovery is recommended eligible for inclusion on the NRHP. The site cannot be avoided, Tetra Tech recommends data recovery be conducted on the two features and continued monitoring at the location afterward. MK-2-082317 On August 23, 2017 Tetra Tech’s cultural resource monitor was observing top soil stripping activities associated with the haul road construction east of County Road 51. The monitor identified a site within the disturbance area consisting of seven associated thermal features at an approximate depth of 5-10 cm below ground surface. No surface cultural resource material was observed at the location prior to the commencement of the disturbance. While the upper portion of each feature was likely removed during ground stripping the remaining portions appear to be intact. No other cultural material or intact sediments remain at the location within the disturbance area.