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Vantage to Pomona Heights Chapter 2 230 kV Transmission Line Project FEIS Proposed Action and Alternatives PAGE 2-65 Route Segment NNR-4o/NNR-4u would be located on privately owned and JBLM YTC-managed land and parallel the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line, crossing it at two locations. Both an Overhead Design Option (Route Segment NNR-4o) and an Underground Design Option (Route Segment NNR-4u) have been analyzed for this route segment. The Overhead and Underground Design Options are located along the same route alignment. West of I-82, Route Segment NNR-4o/NNR-4u would cross the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line, and proceed west to the northern I-82 crossing. This I-82 crossing would occur adjacent to and at the same location as the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line crossing. The approximate length of this crossing would be 1,000 feet and H-frame structures would be utilized. For the Overhead Design Option (Route Segment NNR-4o), the interstate crossing would involve the placement of a new transmission structure on the western side of the interstate south of Exit 11 on private property. No structures would be placed within the interstate ROW. Conductor to ground clearance of this interstate crossing would be a minimum of 34 feet according to WSDOT. The crossing of I-82 would not involve a break in access, so approval from WSDOT at the regional level would be necessary. A permanent access break, authorizing the use of Exit 11 by WSDOT, would be required for construction access. A detailed map showing the location of Crossing #2 is provided as Figure 2-13. Route Segment NNR-4u, underground transmission construction, would be similar to that shown in Figure 2-13, with the transition stations located approximately 1,000 feet apart on the west and east sides of I-82 and on private and JBLM YTC land. Transition stations are assumed because this is a commonly used construction method utilized for underground systems, and is more simple and cost effective than alternative methods (e.g., HDD). Approximately 1.2 miles of Route Segment NNR-4o/NNR-4u crosses private land targeted for mitigation acquisition to offset impacts from the proposed Wymer Dam and Reservoir Project. The total length of Route Segment NNR-4o/NNR-4u would be 4.5 miles. Route Segment NNR-5 would be a short route segment located on the southern end of Badger Pocket, inside the JBLM YTC boundary on the south side of the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line. This route segment was located to avoid impacts to agricultural land within Badger Pocket. Route Segment NNR-5 is being considered for overhead construction only. The total length of Route Segment NNR-5 is 1.8 miles. Route Segment NNR-6o/NNR-6u would parallel the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line west of Badger Pocket for 6.4 miles and would be entirely within JBLM YTC. Line separation would be approximately 200 feet in this area. Both an Overhead Design Option (Route Segment NNR-6o) and an Underground Design Option (Route Segment NNR-6u) have been analyzed for this route segment. The Overhead and Underground Design Options are located along the same alignment. For NNR-6u, overhead to underground transition stations would be located on the east and west end where the route segment connects with Route Segments NNR-5 and NNR-7. The total length of Route Segment NNR-6o/NNR-6u is 6.4 miles. Route Segment NNR-7 would be located in the northeastern portion of JBLM YTC. This route segment would proceed east and parallel the existing Pacific Power Pomona-Wanapum 230 kV Transmission Line. In addition, the route segment would parallel portions of the Puget Sound Energy Wind Ridge-Wanapum 230 kV Transmission Line and the BPA Schultz-Wautoma No. 1 500 kV Transmission Line within the JBLM YTC, and cross the John Wayne Pioneer Trail on to BLM-administered land west of the Columbia River. Route Segment NNR-7 is being considered for overhead construction only. The total length of Route Segment NNR-7 is 8.2 miles. Route Segment NNR-8 would begin on BLM-administered land on the west bank of the Columbia River. The route segment would proceed east 0.4 mile on BLM-administered land. An approximately