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Structure Location Construction Dates <br />Light Use Road 6 RSS Exhibits 57 & 58 1983 -1992 <br />Description -This road provides access to the 2 West Portal area of the Roadside <br />South Portals. The road extends from its junction with Access Road 3, to the 2 West <br />Portals. <br />Design and Construction -The road to the 2 West Portal was an existing BLM access <br />road that follows the existing topography with minimal grading. The road has only a <br />slight grade change and meanders to avoid natural obstructions. The road is one lane <br />with widths from 10' to 15'. Minor grading and drainage control was done on this road <br />in 1992. The road to the portals is used once a week to check the portal substation and <br />area. <br />Drainage -Due to the Light use of the road, the drainage control primarily consists of <br />graveling natural drainages across the road. The location of these cross drains is <br />shown on Exhibit 57. <br />Surfacing -The road surface for most of this light use road is dirt or existing rock <br />surfaces. <br />Maintenance -The road is graded occasionally to eliminate ruts and to promote <br />drainage. Additional water bars or gravel will be installed as necessary to minimize <br />erosion. <br />• <br />PR-4 T13-2-12 Rev 07/07 <br />