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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-177 Access Levels for Route Segment NNR-2 are assumed as Levels 2 and 3 for most of the route and would require the construction of approximately 3.5 miles of spur roads and approximately 5.8 miles of access roads for a total of 9.4 miles of new roads. Moderate to low impacts would result from the construction of Route Segment NNR-3. 4.7.4.13 Route Segment NNR-4o/4u Overhead Design Option This route segment would be accessed from Exit 11 through an existing gate adjacent to the stockpile area on the southwest side of the I-82 or from the JBLM YTC Exit 11 access gate. Use of Exist 11 will require FHWA and WSDOT approval. Existing roads on JBLM YTC or private land would be used and improved as necessary (Access Level 2 or 3, typically), including those that follow Pacific Power’s existing Pomona-Wanapum 230 kV transmission line. This route segment would cross I-82 and the JBLM YTC secondary access road servicing the I-82 Exit 11 (Figure 4.7-3). NNR-4o would cross I-82 approximately 200 feet north of Pacific Power’s existing Pomona-Wanapum 230 kV transmission line which is one mile south of Exit 11. This crossing would involve the placement of one transmission structure on western side of the interstate on private property. The other structure would be placed on the eastern side of the interstate on the JBLM YTC. No structures would be placed within the interstate ROW corridor. The approximate length on this crossing would be 1,000 feet and would utilize H-frame structures. Conductor to ground clearance of this crossing would be a minimum of 34 feet. A permanent access break, authorizing the use of Exit 11, would be required if access is necessary from I-82. A permanent access break, authorizing the use of Exit 11, would be required for maintenance purposes and a temporary access break would be required for construction. Temporary road closure of I-82 during conductor stringing activities would occur to maintain safety. Other impacts on I- 82 traffic are discussed in Section 4.7.3 (Impacts Common to All Alternatives) and would be low. Access Levels for Route Segment NNR-4o are assumed as Level 2 and 3 for most of the route segment as it follows Pacific Power’s existing Pomona-Wanapum 230 kV transmission line. This route segment would require the construction of approximately 1.8 miles of spur roads and approximately 1.0 mile of access roads for a total of 2.8 miles of new roads. Low to moderate impacts would result from the construction of Route Segment NNR-4o. Underground Design Option The alignment of the Underground Design Option (NNR-4u) would be similar to what is shown in Figure 2-6, with the transmission line overhead to underground transition stations located on the west and east sides of the 1,000 foot overhead crossing of I-82 on private and JBLM YTC land. Impacts on transportation would be similar in terms of access (from I-82 Exit 11 and JBLM YTC) and the crossing of I-82. However, construction across JBLM YTC would cause the closure of the secondary access road servicing Exit 11 for a short term during trenching and duct bank construction in this area. Other impacts on I-82 traffic are discussed in Section 4.7.3 (Impacts Common to All Alternatives) and would be low. In this area, extensive road construction in the bivouac area of Training Area 16 would allow for the rerouting of traffic within the training center. RDFs would reduce traffic impacts to the JBLM YTC road. Low to moderate impacts would result from the construction of Route Segment NNR-4u. 4.7.4.14 Route Segment NNR-5 Route Segment NNR-5 crosses the southern portion of Badger Pocket within JBLM YTC, generally paralleling the fire break road. Access would be provided from the perimeter road and from within JBLM YTC. This road would be minimally affected during the construction of the route segment. Route Segment NNR-5 would require the construction of approximately 0.7 mile of spur road and 0.1 mile of