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• the "Pipe Flow Charts" in HDS-3. If flow in the culvert has a free surface, entrance <br />control exists, and exit velocity can be approximated by using the greater of normal or <br />critical velocity determined by the "Pipe Flow Charts" in HDS-3. <br />Maintenance. Access roads will be inspected on a daily work basis at the Nucla East Mine. <br />If, upon inspection, it is determined that repairs are needed, appropriate repairs such <br />as, but not limited to, bl ading, filling of potholes, replacement of the road surfaces, <br />revegeta tion of side slopes and watering for dust control, will be conducted as necessary. <br />Restoration. Unless Peabody requests retention of access roads for postmining land use <br />and the Division approves such request, immediately after the road is no longer needed for <br />operations, reclamation, or monitoring: <br />a. The road will be closed to vehicular traffic; <br />b. The natural-drainage patterns will be restored; <br />c. All bridges and culverts will be removed; <br />d. Roadbeds will be ripped, plowed and scarified; <br />e. Fill slopes will be rounded or reduced and shaped to conform the site to <br />• adjacent terrain and to meet natural-drainage restoration standards; <br />f. Cut slopes will be shaped to blend with the natural contours; <br />g. Terraces will be constructed as necessary to prevent excessive erosion and to <br />provide long-term stability in cut-and fill slopes; <br />h. The regraded area will be covered with topsoil in accordance rvith the approved <br />reclamation plan; <br />i. Unless otherwise authorized by the Division, all road-surfacing materials will <br />be removed, hauled or conveyed and disposed under 4.11.4. <br />Light-Use Roads <br />At the Nucla Mine, there is approximately 1.44 miles of existing and proposed light-use <br />roads. There is approximately 1.09 miles of existing light-use roads. These roads will <br />only be used on an intermittent basis for purposes other than transportation of coal <br />including, but not limited to, roads used for monitoring and periodic maintenance of <br />monitoring facilities and reclamation areas, intermittent equipment passage from one mine <br />area to another mine area, or other occasional use. At the Nucla East area, there are <br />approximately 0.35 miles of proposed light-use roads. These roads will only be used as <br />described above on an intermittent basis. <br />13-29 Revised 08/19/88 <br />