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• Section 780.21(b) Continued. <br />constructed, maintained and reclaimed in accordance with Section <br />816.43. Specific design criteria for temporary diversion structures <br />are presented in Exhibit 42, Drainage and Sediment Control Plan, and <br />are discussed in more detail under Sections 780.29 and 816.43. <br />Drainage control from such facilities as haul roads, parking lots, <br />tipple areas, buildings and other structures is an important factor <br />in minimizing contributions of sediment outside the permit area. All <br />such facilities have been designed and will be built or modified to <br />provide for proper handling of runoff. Drainage control for haul <br />roads includes installation of drainage ditches, maintenance of 4Yo <br />crown, avoidance of steep grades where possible, proper sizing and <br />placement of culverts, and placement of riprap and other energy <br />dissipators where necessary. These control measures are discussed in <br />Section 780.37. Frequent maintenance will also be conducted to <br />insure the integrity of runoff control measures. Class I Roads will <br />be surfaced with durable material. Like haul roads, all access <br />roads, parking lots, and other structures will have proper drainage <br />control. The locations of all such facilities are shown on Map 1, <br />Kerr Mine Area Mine Plan, Map 16a, Kerr Mine Area Surface Mater <br />Hydrology, and Map 17a, Kerr Tipple Area Hydrology. The relationship <br />of these facilities to watersheds and other drainage patterns can be <br />determined from Map 16a, Kerr Mine Area Surface Water Hydrology and ~ <br />Map 17a, Kerr Tipple Area Hydrology. These maps show locations of <br />diversion ditches, road ditches and culverts. As part of the <br />maintenance program, all existing and proposed roads and other <br />facilities will be graded frequently and will have associated <br />culverts, drains, and ditches periodically cleaned. A detailed <br />discussion and presentation of design criteria, including drainage <br />and sediment control, for all roads, other transportation and support <br />facilities is set forth in Section 816.150-816.181. <br />780-96 aaR <br />Revised - January, 1991 <br />