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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-221 4.8.6 Mitigation Measures The following mitigation measures have been identified to reduce, avoid, minimize, or rectify adverse impacts to visual resources. These mitigation measures would be implemented where warranted, are anticipated to be effective, and are summarized in Table 4.8-9 below. Table 4.8-9 Vantage-Pomona Heights Transmission Project Mitigation Measures MITIGATION MEASURE DESCRIPTION VR – 1: Avoid Interference with Prominent Views (Micro-siting) To minimize visual impacts to sensitive views and within standard engineering practices and to the extent feasible, the final locations of transmission line structures would be adjusted to avoid locations that place the structures in the middle of the line of sight toward important views from residences, roads, trails, and other key observation areas. VR – 2: Maximize Span Length at Linear Feature Crossings At highways, trails, canyons, or other sensitive feature crossings, structures shall be placed at the maximum feasible distance from the crossing within standard structure design and in conformance with engineering and Pacific Power requirements to reduce visual impacts and potential impacts on recreation values and functions and to increase safety at these locations. VIS – 3: Span Matching of Existing Structures To the extent practicable and within the limits of standard structure design, Pacific Power shall match existing structure spacing, spans and heights as closely as possible to reduce visual complexity as seen from high concern viewpoints. VIS – 4: Avoid Skylining of Structures To the extent practical, Pacific Power shall design and locate transmission structures so that they do not break the skyline or are directly on the skyline when viewed from sensitive viewpoints. 4.8.7 Residual Impacts To minimize potential impacts to visual resources, selective mitigation measures described in Table 4.8-9 above would be implemented. Residual impacts for all of the route segments are presented in Table 4.8-10. To minimize the effects of potential view obstruction, mitigation measure VR-1: Avoid Interference with Prominent Views (Micro-siting) would be implemented in specific locations as necessary. Mitigation measure VR-1 would be effective at reducing impacts by siting structures in areas that are not within the line of sight to landscape focal points from specific locations as identified in consultation with the landowner and would reduce impacts from high to moderate or from moderate to low. This mitigation measure would be implemented in the following locations: • Route Segment 1a/NNR-1: MP 0.8-2.3 • Route Segment 1c: MP 10.2-10.7 • Route Segment 3b: MP 19.1-19.3 (Interim VRM Class III mitigation) • Route Segment 1a/NNR1: MP 0.8-2.4 To minimize the effects of structure dominance as seen from sensitive viewpoints, mitigation measure VR-2: Maximize Span Length at Linear Feature Crossings would be implemented in specific locations as necessary. Mitigation measure VR-2 would be effective at reducing impacts by placing the structures at the maximum feasible distance from the viewpoint to reduce their dominance in the landscape, and would reduce impacts from high to moderate or from moderate to low. This mitigation measure would be implemented in the following locations: