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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-19 Impacts for Route Segment 1c are anticipated to be: 1.2 miles of no identifiable, 8.7 miles of low, and 3.1 miles of moderate. Special Status Species and Priority Habitats No federally listed plants are known to occur along Route Segment 1c (Table 4.2-5). WNHP data indicate that snowball cactus is known to occur along Route Segment 1c and Nuttall’s sandwort and Hoover’s tauschia occur within one mile of Route Segment 1c. No WNHP priority ecosystems are known to occur along Route Segment 1c. One hundred percent (1.7 acres) of federal lands within this route segment were surveyed for special status plants; however, the majority of Route Segment 1c is comprised of non-federal land (249.6 acres) and was not surveyed (Table 3.2-3). As not all land within the route segment was surveyed, impacts could occur to special status plant species. Long-term disturbance would occur to potential habitat for special status plants, including 6.0 acres of suitable, 16.2 acres of marginal, and 0.8 acre unsuitable habitat. RDFs described above for Route Segment 1a/NNR-1 would also be implemented during construction and maintenance of Route Segment 1c to minimize impacts to special status plants. With the implementation of RDFs, impacts to special status plant species and potential suitable habitat are anticipated to include 1.2 miles of no identifiable, 8.6 miles of low impacts, and 3.2 miles of moderate impacts. Snowball Cactus WNHP data indicate that snowball cactus intersects Route Segment 1c for 0.5 mile. These locations include large buffers, so it is difficult to accurately determine whether these occurrences truly intersect the ROW corridor. All potential habitat on federal and state lands was surveyed; therefore, it is unlikely snowball cactus occurs in Route Segment 1c. With the implementation of RDFs described above and the assumption that occurrences would be spanned and avoided, Project construction, operation, and maintenance activities could impact individuals or habitat (moderate impact), but would not contribute a trend toward federal listing. Refer to Route Segment 1b for more information on snowball cactus. 4.2.4.4 Route Segment 2a General Vegetation Long-term disturbance to approximately 2.1 acres of land would occur with the construction of Route Segment 2a (Table 4.2-4). Construction would result in the long-term disturbance of 1.9 acres of annual grasslands and 0.2 acre of perennial grasslands. Short-term disturbance would occur to approximately 3.9 acres of vegetation. General vegetation impacts are similar to those described above for Route Segment 1a/NNR-1. Disturbance would be minimized by RDFs described above that are designed to reduce impacts to vegetation resources. RDFs include using existing public roads to access structure sites, minimizing blading and disturbance to plant communities, revegetating following construction, and implementing a Noxious Weed and Invasive Plant Management Plan. Refer to Section 2.3 - Required Design Features Common to Action Alternatives for a complete list and description of RDFs. Impacts for Route Segment 2a are anticipated to be: 1.0 mile of low. Special Status Species and Priority Habitats No special status plant species or priority ecosystems are known to occur along Route Segment 2a (Table 4.2-5). No WNHP priority ecosystems are known to occur along Route Segment 2a. The entirety of Route Segment 2a is comprised of non-federal land (19.3 acres) and was not surveyed (Table 3.2-3). As land within the route segment corridor was not surveyed, impacts could occur to special status plant species. Long-term disturbance would occur to 2.1 acres of marginal habitat for special status plants. RDFs described above for Route Segment 1a/NNR-1 would also be implemented during construction and maintenance of Route Segment 2a to minimize impacts to special status plants and include: avoiding or