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2018 Biological Resources Inventory Report <br /> riparian/herbaceous wetland. Shortgrass and prairie would be the dominant native ecosystem type in the <br /> Project area under natural conditions, which were not observed during the field survey. <br /> 3.4 Listed Noxious Weeds <br /> Four List B species were identified in the Project area and two List C noxious weeds were identified. No <br /> large infestations of noxious weeds were identified. Adams County has listed Russian olive and musk <br /> thistle for eradication by 2022. Downy brome, in particular, was observed in several large dense patches. <br /> Tetra Tech recommends consultation with the Adams County noxious weed coordinator to determine <br /> requirements for control of noxious weeds prior to construction. <br /> 20 Tucson South Sand and Gravel Mine—Brighton,Colorado <br />