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As virtually all culverts have free outfalls, inlet control assumptions can be verified by <br /> 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. Haul roads are inspected on a daily work basis at the Nucla Mine, lf, upon <br />inspection, it is determined that repairs are needed, appropriate repairs such as, but not <br />limited to, blading, filling of potholes, replacement of the road surfaces, revegeta tion <br />of side slopes and watering for dust control, will be conducted as necessary. <br />Restoration. Unless Peabody requests retention of haul roads for postmining land use and <br />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 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 rvi th 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 reclaimed in accordance with the approved reclamation <br />plan; <br />i. Unless otherwise authorized by the Division, all road-surfacing materials will <br />be removed, hauled or conveyed and disposed under 4.17.4. <br />Access Road <br />At the Nucla Mine, there are approximately 1.43 miles of existing and proposed access <br />roads. there are approximately 0.23 miles of existing access roads. In addition, <br />approximately 1.12 miles of access road are proposed at the Nucla East area, These roads <br />will be used on a frequent basis to service the office-shop facilities area and the <br />proposed dragline erection site. <br />General Requirements. Peabody wi 17 construct, maintain and reclaim access roads to <br />13-23 Revised 08/19/88 <br />