Vantage to Pomona FEIS Index 34 - Laserfiche WebLink

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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-45 Alternative B General Vegetation Long-term disturbance to approximately 179.6 acres of land (Table 4.2-6) would occur with the construction of Alternative B. The long-term disturbance would occur within 157.9 acres of sagebrush/perennial grassland, 11.1 acres of annual grassland/noxious weeds, 0.7 acres of intermittent stream/dry gully, 6.7 acres of perennial grassland, 0.9 acres of rabbitbrush annual grassland, 0.4 acre of riparian/wetland, 0.2 acre of rock/basalt cliff, 0.4 acres of sagebrush annual grassland, and 1.3 acres of trees. Approximately 62.1 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 Alternative B are anticipated to be: no identifiable for 15.3 miles; low for 14.8 miles, and moderate for 31.4 miles. Of the nine Action Alternatives, Alternative B has the second highest vegetation impacts at the moderate level. Special Status Species and Priority Ecosystem Alternative B crosses 12.7 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 Alternative B, long-term disturbance to special status species potential habitat would occur to 29.2 acres of suitable, 13.2 acres of marginal, and 16.6 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for Alternative B is anticipated to include 9.3 miles of no identifiable, 12.0 miles of low impacts, and 40.2 miles of moderate impacts. Of the nine Action Alternatives, Alternative B has the second highest impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at the moderate level. Alternative C General Vegetation Long-term disturbance to approximately 140.1 acres of land (Table 4.2-6) would occur with the construction of Alternative C. The long-term disturbance would occur within 116.9 acres of sagebrush perennial grassland, 14.8 acres of annual grassland/noxious weeds, 5.2 acres of perennial grassland, 0.9 acres of rabbitbrush annual grassland, 0.4 acre of riparian/wetland, 0.2 acre of rock/basalt cliff, 0.4 acre of sagebrush annual grassland, and 1.3 acres of trees. Approximately 68.9 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 Alternative C are anticipated to be: no identifiable for 21.8 miles; low for 16.6 miles, and moderate for 24.9 miles. Of the nine Action Alternatives, Alternative C has among the lowest vegetation impacts at the moderate level. Special Status Species and Priority Ecosystem Alternative C crosses 12.1 miles of WNHP special status plant polygons, 2.2 miles of special status plant occurrences found during Project-specific surveys, and no WNHP priority ecosystems (Table 4.2-7). With Alternative C, long-term disturbance to special status species potential habitat would occur to 22.4 acres of suitable, 15.3 acres of marginal, and 23.1 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for Alternative C is anticipated to include 15.8 miles of no identifiable, 14.2 miles of low impacts, and 33.3 miles of moderate impacts. Of the nine Action Alternatives, Alternative C is near the middle of the Action Alternatives for impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at both the moderate and low level.