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Regional General Permit Notification for Grisenti Farms Gravel Pit Bank Stabilization Project Fremont County,Colorado Corps File No.RGP-37 Table 1. Federally threatened,endangered,and candidate species potentially found in Fremont County or potentially affected by projects in Fremont County. Habitat Present or Common Name Scientific Name Status' Habitat Potential to be Affected by Project? Mammals Canada lynx Lynx conodensis T Climax boreal forest with a No dense understory of thickets and windfalls North American wolverine Gulo gulo luscus PT High-elevation areas that No maintain deep snow into spring and cool temperatures throughout summer Birds Mexican spotted owl Strrx occidentalrs T Closed canopy forests in steep No canyons 'T=Federally Threatened Species,PT=Proposed Threatened. Source:Service 2018. The proposed project would not affect the Canada lynx,North American wolverine,or Mexican spotted owl because of the lack of habitat in the project area. National Historic Preservation Act Compliance To assist with the Corps'consultation obligations under Section 106 of the National Historic Preservation Act(NHPA),ERO archaeologist Abigail Sanocki conducted a file search of the project area. The file search was conducted using the Colorado Office of Archaeology and Historic Preservation online Compass database on April 5,2018. The file search area covers the project area defined on Figure 1. The database indicates that no previously conducted cultural resource surveys have been conducted within the project area and,therefore,there are no previously documented cultural resources within the project area. Activity to be Authorized To stabilize the east bank of the Arkansas River and protect the existing access road within the Grisenti Farms Gravel Pit,Transit Mix is proposing to stabilize approximately 415 linear feet of the east bank of the Arkansas River. The bank stabilization would consist of installing concrete bank stabilization, installing four concrete cross vanes,and laying back the banks above the stabilized banks. Due to limited funding and the availability of dean broken concrete on-site,Transit Mix is proposing to use broken concrete to stabilize the banks and as material for the cross vanes. All exposed reinforcing material would be removed from the broken concrete prior to the proposed work. Construction design plans are provided in Appendix C. Bank Stabilization To stabilize the east bank of the Arkansas River,Transit Mix is proposing to install 415 linear feet of broken concrete bank protection. The broken concrete would range in size from 12 by 12 inches to 24 ERO Project*7141 7 13