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2018 Biological Resources Inventory Report <br /> Table 8: <br /> Relationship Between Vegetation Types and Soils Types <br /> Acreage Percent of <br /> In Project cover in <br /> NRCS Soil Type area Project area Cover type <br /> 1.1 0.4 Invasive Annual Grassland <br /> 0.5 0.2 Mowed Grassland <br /> 1.0 0.4 Riparian I Herbaceous Wetland <br /> Water 1.0 0.4 Forested Riparian Floodplain <br /> 4.8 1.9 Riparian I Herbaceous Wetland <br /> 4.5 1.8 Invasive Annual I Biannual Forbland <br /> 12.7 4.9 Invasive Annual Grassland <br /> 1.6 0.6 Riparian I Herbaceous Wetland <br /> 2.2.2.6 Listed Noxious Weed Inventory Results <br /> Table 9 lists the seven species of state listed noxious weeds that were observed in the Project area <br /> during the field surveys. Four list B species were identified in the Project area and two List C noxious <br /> weeds were identified. Large infestations of downy brome were identified throughout the Project area. <br /> Table 9: <br /> Noxious Weed Species Observed During Field Surveys <br /> Weed List(A, <br /> B,or C)l Common Name Scientific Name State Management Policy <br /> List A Weeds None observed. — — <br /> List B Weeds Scotch cottonthistle Onopordum acanthium Contain:Figure 20.01 <br /> Russian-olive Elaeagnus angustifolia Eliminate by 2022 <br /> Musk thistle Carduus nutans Eliminate by 2022 <br /> Russian knapweed Acroptilon repens Contain:Figure 14.01 <br /> List C Weeds Downy brome Bromus tectorum Control up to landowners'discretion <br /> Field bindweed Convolvulus arvensis Control up to landowners'discretion <br /> Source:CDA(2017b) <br /> 1 List B:the state of Colorado and Adams County have developed noxious weed management plans to stop the continued spread of these <br /> species.Figure numbers refer to containment maps included in the 2015 Noxious Weed Act—Rules and Regulation Containment Figures <br /> by Counties(CDA 2017b.) <br /> List C:widespread and well-established noxious weed species for which control is recommended but not required by the state. <br /> 3. Conclusions <br /> This biological resources assessment evaluated major categories of resources including special status <br /> species, general wildlife and vegetation, and state listed noxious weeds. The special status species <br /> included assessment of federal and state listed species, raptors, and migratory birds. <br /> 18 Tucson South Sand and Gravel Mine—Brighton,Colorado <br />