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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-49 NNR Alternative – Underground Design Option General Vegetation Long-term disturbance to approximately 208.7 acres of land (Table 4.2-6) would occur with the construction of NNR Alternative – Underground Design Option. The long-term disturbance would occur within 176.3 acres of sagebrush perennial grassland, 2.2 acres of annual grassland/noxious weeds, 0.3 acre of bitterbrush perennial grassland, 0.6 acre of forbs, 0.2 acre of intermittent stream/dry gully, 3.6 acres of perennial grassland, 1.1 acres of rabbitbrush annual grassland, 0.4 acre of rock/basalt cliff, 23.9 acres of sagebrush annual grassland, and 0.2 acre of trees. Approximately 35.8 acres of vegetation would be temporarily disturbed. Disturbance would be minimized by RDFs described above that are designed to reduce impacts to vegetation resources. Vegetation impacts for NNR Alternative – Underground Design Option are anticipated to be: no identifiable for 2.5 miles, low for 9.8 miles, and moderate for 28.6 miles. Of the nine Action Alternatives, NNR Alternative – Underground Design Option has vegetation impacts near the middle of the Action Alternatives at the moderate level. Special Status Species and Priority Ecosystem NNR Alternative – Underground Design Option crosses 8.4 miles of WNHP special status plant polygons, 2.7 miles of special status plant occurrences found during Project-specific surveys, and no WNHP priority ecosystems (Table 4.2-7). With NNR Alternative – Underground Design Option, long- term disturbance to special status species potential habitat would occur to 29.0 acres of suitable, 8.7 acres of marginal, and 2.9 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for NNR Alternative – Underground Design Option is anticipated to include 2.4 miles of no identifiable, 7.9 miles of low impacts and 30.6 miles of moderate impacts. Of the nine Action Alternatives, NNR Alternative – Underground Design Option has among the lowest impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at the moderate level. NNR Alternative – Manastash Ridge Subroute General Vegetation Long-term disturbance to approximately 184.9 acres of land (Table 4.2-6) would occur with the construction of NNR Alternative – MR Subroute. The long-term disturbance would occur within 159.2 acres of sagebrush/perennial grassland, 14.7 acres of annual grassland/noxious weeds, 0.6 acre of forbs, 0.2 acre of intermittent stream/dry gully, 3.6 acres of perennial grassland, 1.1 acres of rabbitbrush annual grassland, 0.4 acre of rock/basalt cliff, 4.8 acres of sagebrush annual grassland, and 0.2 acre of trees. Approximately 46.8 acres of vegetation would be temporarily disturbed. Disturbance would be minimized by RDFs described above that are designed to reduce impacts to vegetation resources. Vegetation impacts for NNR Alternative – MR Subroute are anticipated to be: no identifiable for 5.1 miles, low for 12.6 miles, and moderate for 30.5 miles. Of the nine Action Alternatives, NNR Alternative – MR Subroute is near the middle of the Action Alternatives for vegetation impacts at the moderate level. Special Status Species and Priority Ecosystem NNR Alternative – MR Subroute crosses 8.4 miles of WNHP special status plant polygons, 2.6 miles of special status plant occurrences found during Project-specific surveys, and 0.4 miles of WNHP priority ecosystems (Table 4.2-7). With NNR Alternative – MR Subroute, long-term disturbance to special status species potential habitat would occur to 30.9 acres of suitable, 11.5 acres of marginal, and 5.5 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for NNR Alternative – MR Subroute is anticipated to include 4.9 miles of no identifiable, 10.7 miles of low impacts and 32.6 miles of moderate impacts. Of the nine Action Alternatives, NNR Alternative – MR Subroute is near the middle of the Action Alternatives for impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at the moderate level.