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 4-48 Alternative H General Vegetation Long-term disturbance to approximately 170.2 acres of land (Table 4.2-6) would occur with the construction of Alternative H. The long-term disturbance would occur within 129.9 acres of sagebrush/perennial grassland, 30.2 acres of annual grassland/noxious weeds, 0.1 acre of intermittent stream/dry gully, 3.4 acres of perennial grassland, 3.0 acres of rabbitbrush annual grassland, 0.3 acre of riparian/wetland, 0.6 acre of rock/basalt cliff, and 2.8 acres of sagebrush annual grassland. Approximately 90.8 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 Alternative H are anticipated to be: no identifiable for 18.5 miles, low for 24.3 miles, and moderate for 24.4 miles. Of the nine Action Alternatives, Alternative H has among the lowest vegetation impacts at the moderate level. Special Status Species and Priority Ecosystem Alternative H crosses 9.0 miles of WNHP special status plant polygons, 0.6 miles of special status plant occurrences found during Project-specific surveys, and 3.8 miles of WNHP priority ecosystems (Table 4.2-7). With Alternative H, long-term disturbance to special status species potential habitat would occur to 23.8 acres of suitable, 22.7 acres of marginal, and 18.0 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for Alternative H is anticipated to include 17.3 miles of no identifiable, 19.8 miles of low impacts, and 30.1 miles of moderate impacts. Of the nine Action Alternatives, Alternative H has among the lowest impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at the moderate level. NNR Alternative – Overhead Design Option General Vegetation Long-term disturbance to approximately 163.5 acres of land (Table 4.2-6) would occur with the construction of NNR Alternative – Overhead Design Option. The long-term disturbance would occur within 140.7 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, 14.1 acres of sagebrush annual grassland, and 0.2 acre of trees. Approximately 30.5 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 – Overhead 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 – Overhead Design Option has vegetation impacts near the middle of the Action Alternatives at the moderate level. Special Status Species and Priority Ecosystem NNR Alternative – Overhead 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 – Overhead 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 – Overhead 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 – Overhead Design Option has among the lowest impacts to special status plant species and potential suitable habitat and no impacts to WNHP priority ecosystems.