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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-43 4.2.6 Impact Summary by Alternative 4.2.6.1 No Action Alternative Under the No Action Alternative, the proposed Project would not be constructed or operated. No Project- related impacts to vegetation would occur, but changes in vegetation would continue as a result of natural conditions and future development. 4.2.6.2 Action Alternatives Table 4.2-6 presents a summary of the impacts for all Action Alternatives, by design option and impact levels following the implementation of RDFs for vegetation resources. The impact summary for special status plants and priority ecosystems is presented separately in Table 4.2-7. Alternative A General Vegetation Long-term disturbance to approximately 210.1 acres of land (Table 4.2-6) would occur with the construction of Alternative A. The long-term disturbance would occur within 182.2 acres of sagebrush/perennial grassland, 14.6 acres of annual grassland/noxious weeds, 0.7 intermittent stream/dry gully, 6.0 acres of perennial grassland, 3.0 acres of rabbitbrush annual grassland, 0.3 acre of riparian/wetland, 0.6 acre of rock/basalt cliff, 2.8 acres of sagebrush annual grassland, and 0.1 acre of trees. Approximately 71.0 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 A are anticipated to be: no identifiable for 11.9 miles; low for 18.9 miles, and moderate for 34.2 miles. Of the nine Action Alternatives, Alternative A has the highest vegetation impacts at the moderate level. Special Status Species and Priority Ecosystem Alternative A crosses 9.6 miles of WNHP special status plant polygons, 1.5 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 A, long-term disturbance to special status species potential habitat would occur to 33.7 acres of suitable, 17.1 acres of marginal, and 11.5 acres of unsuitable habitat. Long-term disturbance to special status plant species, potential suitable habitat, and WNHP priority ecosystems for Alternative A is anticipated to include 10.5 miles of no identifiable, 14.0 miles of low impacts, and 40.5 miles of moderate impacts. Of the nine Action Alternatives, Alternative A has the highest impacts to special status plant species, potential suitable habitat, and WNHP priority ecosystems at the moderate level. Table 4.2-5 Long-Term Disturbance to Special Status Species and Habitat by Route Segment ROUTE SEGMENT HABITAT SUITABILITY1 SPECIAL STATUS PLANTS AND COMMUNITIES SUITABLE MARGINAL UNSUITABLE WNHP SPECIAL STATUS PLANT POLYGONS CROSSED SPECIAL STATUS PLANTS FOUND DURING SURVEY WNHP PRIORITY ECOSYSTEM CROSSED mi ac % mi ac % mi ac % mi mi mi 1a/NNR-1 2.4 miles 0.7 0.7 29.5 1.2 1.1 50.6 0.5 0.4 19.9 0 0 0 1b 12.5 miles 6.3 5.1 45.4 5.1 5.4 47.5 1.2 0.8 7.0 0.5 0.4 0