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t ' <br /> 2019 Biological Resources Inventory Report <br /> 1 Potential for Occurrence: Unlikely—No species range overlap in the Project or unsuitable habitat;Low—species range overlaps with <br /> Project with marginally suitable habitat;Moderate—species range overlaps with Project with suitable habitat or species is known to occur <br /> in habitat similar to habitat in Project;High—suitable habitat is present in the Project or known populations exist in the Project;Present— <br /> species observed during field surveys. <br /> 2 Source:Hammerson(1999) <br /> 3 Source:Sibley(2014) <br /> 4 Source:Johnson(2007) <br /> 5 Source:Sullivan et al.(2009) <br /> 6 Source:Nico et al.(2017) <br /> 7 Source:Fitzgerald et al.(1994) <br /> 8 Source:USFWS(2010) <br /> 2.2.1.4.1 Burrowing Owl <br /> Burrowing owls (ST), have suitable habitat in active and remnant black-tailed prairie dog colonies that <br /> intersect the Project area. Only one of three potential black-tailed prairie dog colonies were documented <br /> to be active in the Project area; however, burrows that could be used as burrowing owl habitat were <br /> documented in each mapped potential black-tailed prairie dog colony. Pre-construction surveys for <br /> burrowing owls according to CPW-recommended survey protocol would be conducted in these locations if <br /> construction occurs during the burrowing owl breeding season (March 15—October 31). If nesting owls are <br /> observed, the nesting location will be documented, and Al will notify the DRMS. Al will implement the <br /> CPW-recommended 150-foot non-encroachment buffer from active burrows. <br /> 2.2.1.4.2 Plains Minnow, Suckermouth Minnow, and Brassy Minnow <br /> Three fish species, plains minnow(SE), suckermouth minnow(SE), and brassy minnow (ST) have the <br /> potential to occur in perennial and intermittent waters intersected by the Project. Impacts to perennial and <br /> intermittent streams (Brighton Ditch, Brantner Ditch, and the Brighton Return) in the Project area will be <br /> avoided, and stream flows will not be altered. No impacts to these species are expected. <br /> 2.2.1.4.3 River Otter <br /> River otters (ST) prefer riparian habitats along perennial river systems and are known to occur along the <br /> South Platte River. River otters use beaver dens and lodges, brush piles, and muskrat dens in secluded <br /> areas for natal dens, rearing young throughout the spring and summer months (Fitzgerald et al. 1994). <br /> The Project would avoid direct impacts to the river otter and impacts to potential river otter breeding <br /> habitat along the South Platte River and its associated riparian area including potential natal dens. No <br /> impacts to the South Platte River, the river otter, or its habitat is anticipated. <br /> 2.2.1.5 Migratory Birds <br /> CPW shapefiles were consulted to identify any known potential Bald Eagle or Osprey nests located in or <br /> near the Project area. The closest documented Bald Eagle nest is located approximately 0.8 mile away <br /> from the Project area (CPW 201c). Table 5 lists 24 species of migratory birds that should be considered <br /> as part of an effects analysis for this Project area according to IPaC output (Attachment 2). <br /> Tucson South Sand and Gravel Mine—Brighton, Colorado 13 <br />