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• embankment height, and less than fifteen feet in depth. They will be <br />constructed to cause no hazards to public health, safety or the environment <br />and will be removed and reclaimed when no longer needed in accordance with <br />the plan set forth under Rule 2.05.4. All sumps wil] be designed solely as <br />retention structures which will not result in discharge of water. <br />Drainage control from facilities such as the haulroad, and access road is an <br />important factor in minimizing contributions of sediment outside the <br />proposed permit area. All such facilities have been designed, built and <br />maintained to provide for proper handling of runoff as reflected by Map 6, <br />Mine No. 3 Mine Plan. Design Criteria for the haulroad includes <br />installation of lateral bar ditches, cross drains, ditch relief drains, <br />construction of a four percent crown, avoidance of steep grades where <br />possible, proper sizing and placement of culverts, placement of dugout sumps <br />or other small detention structures, rip-rap and other energy dissipators, <br />and provision for frequent maintenance. The relationship of these <br />facilities to watersheds and other drainage patterns is shown on Map 4a, <br />• Mine No. 3 Hydrology, including locations of diversion ditches and <br />culverts. As part of the maintenance program during operations, the <br />existing haulroad and access road will be graded frequently and will have <br />associated culverts, drains, and ditches periodically cleaned. A detailed <br />discussion and presentation of design criteria, including drainage and <br />sedimentation control, for culverts, ditches, sumps, detention structures <br />and other sediment control facilities is set forth in Exhibit 3, Sediment <br />Control Plan. <br />PRen 2.05-143 Revised 06/15/90 <br />