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Vantage to Pomona Heights Chapter 4 <br />230 kV Transmission Line Project FEIS Environmental Consequences <br /> PAGE 4-163 <br />4.6.4.15 Route Segment NNR-6o/6u <br />There are no SMAs associated with Route Segment NNR-6 and no impacts would occur. <br />4.6.4.16 Route Segment NNR-7 <br />There are no SMAs associated with Route Segment NNR-7 and no impacts would occur. <br />4.6.4.17 Route Segment NNR-8 <br />This route segment crosses the proposed expansion area of the Yakima River Cliffs and Umtanum Ridge <br />ACEC, the Huntzinger Road ACEC, and the planned Wanapum Natural Area Preserve (NAP). Moderate <br />impacts to ACEC values (as previously described) would occur in the short-term due to potential <br />relocation of plants that cannot be avoided during the construction of the Project (see Section 4.3.3 and <br />4.3.4-4). With the implementation of RDFs and the assumption that potential occurrences would be <br />spanned and avoided, Project construction, operation, and maintenance activities could cause some <br />change or stress to plant populations, but will not contribute a trend toward a change in agency (BLM or <br />state) listing status. Therefore, short-term effects on these values may occur to established or proposed <br />ACECs and the Wanapum NAP, causing moderate or low impacts, respectively. <br />4.6.4.18 Route Segment MR-1 <br />There are no SMAs associated with Route Segment Manastash Ridge (MR) 1 and no impacts would <br />occur. <br />4.6.5 Mitigation Measures <br />The RDFs described in Chapter 2 are designed to reduce effects from the proposed Project; therefore, no <br />additional mitigation would be required. <br />4.6.6 Residual Impacts <br />Residual impacts are identical to the impacts described in Sections 4.6.4 because no additional mitigation <br />measures are proposed for SMAs. <br />4.6.7 Impact Summary by Alternative <br />4.6.7.1 No Action Alternative <br />Under the No Action Alternative, the proposed Project would not be constructed or operated. No Project- <br />related impacts to SMAs would occur. <br />4.6.7.2 Action Alternatives <br />Low impacts would occur for 0.2 mile for Alternatives F and H, for 12.8 miles for Alternatives A and D, <br />and for 12.6 miles of Alternatives B and C. Moderate impacts would also occur along 1.8 miles of <br />Alternatives B, C, E, and G. Impacts would be identical for both NNR Alternative Design Options and the <br />MR Subroute, with low impacts occurring for 6.9 miles and moderate impacts for 3.1 miles.