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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-34 were surveyed, there may be additional occupied habitat for snowball cactus in the disturbance footprint that would be identified during pre-construction surveys. For the proposed Project, it was assumed that these occurrences would be spanned and construction activities would avoid these occurrences. 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 toward the need for federal listing. 4.2.4.14 Route Segment NNR-5 General Vegetation Construction of Route Segment NNR-5 would result in long-term disturbance to approximately 8.6 acres of land (Table 4.2-4). The majority of disturbance (8.4 acres) would occur in areas classified as sagebrush/perennial grassland. Long-term disturbance would also occur to 0.2 acre of intermittent stream/dry gully. Approximately 0.4 acres would be disturbed on a short-term basis. General vegetation impacts and RDFs designed to reduce impacts are similar to those described for Route Segment 1a/NNR- 1. Refer to Section 2.3 - Required Design Features Common to Action Alternatives for a complete list and description of RDFs. Impact levels for Route Segment NNR-5 would include 0.1 mile of low and 1.7 miles of moderate impacts. Special Status Species and Priority Ecosystem No special status plant species are known to occur along Route Segment NNR-5 (Table 4.2-5), although WNHP data indicate that snowball cactus occurs within one mile. No known WNHP priority ecosystems would be disturbed through construction of Route Segment NNR-5. Ninety-one percent of federal lands (29.6 acres) within this route segment were surveyed for special status plants (Table 3.2-3); however, as not all land within the route segment corridors was surveyed, impacts could occur to special status plant species. Long-term disturbance could occur to 1.5 acres of potential suitable habitat for special status plants. With the implementation of RDFs described above for Route Segment 1a/NNR-1 and in Section 4.2.3, impact levels to special status plant species and potential suitable habitat are anticipated to include 0.1 mile of low impacts and 1.7 miles of moderate impacts. 4.2.4.15 Route Segment NNR-6o/NNR-6u General Vegetation Overhead Design Option Long-term disturbance to approximately 27.3 acres of land (Table 4.2-4) would occur with the construction of Route Segment NNR-6o. The majority of the long-term disturbance would occur in 26.5 acres of sagebrush/perennial grassland, with 0.6 acre also occurring in areas classified as forbs (e.g., narrowleaf mock goldenweed [Nestotus stenophyllus] and thyme-leaf buckwheat [Eriogonum thymoides]) and 0.2 acre of perennial grassland. Approximately 3.3 acres of vegetation would be disturbed on a short- term basis. General vegetation impacts and RDFs designed to reduce impacts are similar to those described above for Impacts Common to All Route Segments (Section 4.2.3) and for Route Segment 1a/NNR-1. Refer to Section 2.3 - Required Design Features Common to Action Alternatives for a complete list and description of RDFs. With the implementation of RDFs, long-term impact levels for Route Segment NNR-6o would include 0.9 mile of low and 5.6 miles of moderate impacts.