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Vantage to Pomona Heights Chapter 4 <br />230 kV Transmission Line Project FEIS Environmental Consequences <br /> PAGE 4-222 <br />• Route Segment 3b: MP 15.7-15.8, 17.3-17.4, 17.8-17.9, 18.2-18.3, 18.9-19.0, and 20.3-20.4 <br />• Route Segment 3c: MP 3.9-4.0, 19.2-19.3 (Interim VRM Class III mitigation), 21.1-21.2, <br />21.3-21.4, and 24.1-24.2 <br />• Route Segment NNR-3: MP 5.1-5.2 <br />• Route Segment NNR-4: MP 1.2-1.3 <br />• Route Segment MR-1: MP 5.1-5.2 <br />To minimize the effects of structure contrast, mitigation measure VIS-3: Span Matching of Existing <br />Structures would be implemented in specific locations as necessary. Mitigation measure VIS-5 would be <br />effective at reducing impacts by grouping transmission structures, reducing impact from high to <br />moderate, or moderate to low. Matching existing spans of transmission line structures would help to <br />consolidate structure contrasts and minimize the proliferation of vertical elements that may be perceived <br />of as introducing a visual “barrier’ in the landscape if they were offset. This mitigation measure would be <br />implemented in the following locations: <br />• Route Segment 1a/NNR-1: MP 0.0-0.8 <br />• Route Segment 2c: MP 12.6-13.0 <br />• Route Segment 3c: MP16.0-16.2 and 17.0-17.9 (Interim VRM Class III mitigation) <br />To minimize the effects of structure contrast, mitigation measure VIS-4: Avoid Skylining of Structures <br />would be implemented in specific locations as necessary. Mitigation measure VIS-6 would be effective at <br />reducing impacts by increasing the landscape “backdropping” that typically reduces the visibility of <br />structures and conductors. This mitigation measure would be implemented in the following locations: <br />• Route Segment 1b: MP 6.5-6.7 <br />• Route Segment 1c: MP 6.4-6.6 <br />• Route Segment 2d: MP 6.1-6.2 <br />• Route Segment 3c: MP 18.9-19.0 and 19.4-19.5 (Interim VRM Class III mitigation) <br />Table 4.8-10 Project Residual Impacts by Route Segment and Design Option <br />ROUTE SEGMENT RESIDUAL IMPACTS (MILES) <br />Low Moderate High <br />1a/NNR-1 <br />2.4 miles 0.8 0 1.8 <br />1b <br />12.5 miles 1.0 8.8 2.8 <br />1c <br />12.9 miles 0.3 6.5 6.2 <br />2a <br />1.0 mile 0 0.9 0.1 <br />2b <br />16.4 miles 1.8 14.5 0.1 <br />2c <br />18.1 miles 9.2 8.3 0.7 <br />2d <br />7.0 miles 0.3 3.6 3.1 <br />3a <br />0.1 mile 0.1 0 0 <br />3b <br />21.7 miles 2.3 11.8 7.7 <br />3c <br />25.4 miles 7.3 10.4 7.5