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Coal recovery in the South Area affected two drainage networks in the headwaters of Hubberson <br />Gulch, as well as a ridge top that drains toward Sage Creek. One impacted drainage network is the <br />Pond 016 watershed, and the second drainage network is the Pond 017 watershed. <br />As part of the final reclamation activities, SCC reconstructed the affected drainage networks in both <br />the North and South Areas. The locations of the postmining channels are shown on Exhibit 20-2, <br />Postmining Topography and Drainage. The reconstructed drainage networks were designed and <br />constructed to meet the requirements of Rule 4,05.3. All of the channels will be permanent and were <br />designed to safely convey the peak runoff from the 10-year, 24-hour precipitation event. Designs for <br />all postmining drainage channels were calculated using the SEDCAD computer model. The <br />postmining drainage channel designs are presented in Tab Z0, Attachment 20-2, Postmining <br />Drainage Channel Designs. <br />Transportation Facilities <br />Haulaoe Roads. The following describes the design and construction of the haulage roads at the Seneca II- <br />W Mine. Haulage Road G was constructed during the 1992 field season; it served as a haulage and <br />access road for the extreme north part of the mining area. Haul Roads H, 1, J, K and L serve as access <br />roads to coal recovery areas in the Il-W South Area. The locations of existing haul roads are shown on <br />Exhibit 12-2. Geotechnical investigations have been completed for Haul Road G and can be found in <br />Attachment 13-38, Engineering Geologic Ground Stability Investigation, 005 Gulch and Vicinity (Haul <br />Road G). Construction summaries for the other haul roads are presented in Attachment 13-10, Haul <br />Road Construction Summaries. <br />General Requirements. SCC will construct, maintain and reclaim haul roads to minimize erosion and <br />siltation, air and water pollution and damage to public and private property. To the extent possible, using the <br />best technology currently available, haul roads will be designed and constructed to minimize damage to fish, <br />wildlife, or related environmental values and will minimize additional contributions of suspended solids to <br />streamflow or to runoff outside the permit area. Any such contribution shall not be in excess of limitations of <br />Slate or Federal law. <br />Location. The Mine Entrance Haul Road (MEHR), which was originally constructed in 1975 and widened in <br />1989 and Haul Road A, fall under Rule 4.03.1. These two roads cover 4.3 miles. An additional 4.1 miles of <br />haulage road (e.g., TAHR) was constructed from the Hayden Station Power Plant to Routt County Road No. <br />53. As-built plans for the Tie-Across Haul Road, Mine Entrance Haul Road, and Haul Road A are <br />presented in Exhibits 13.11, 13-12 and 13-13, respectively. As-built plans of Roads F, G, H, I, J, K and L <br />are depicted on Exhibits 13-18.1A and 13-19.1A to 13-19.4A, 13-20.1A, 13-21.1A, 13-22.1 A, 13-23.tA and <br />13-24.1 A, respectively. The haulage roads at the mine sRe are designed with appropriate ditches, grades, <br />and culverts to confrol erosion and runoff. Exhibit 13-10, Typical Road Details, and Figures 13-1, Typical <br />Road Embankment, and 13-2, Typical Road Cut, illustrates typical cut and fill sections of the haul roads. <br />All haulage roads will be constructed basically "on-grade" and road location will be partially limited by <br />PR-05 13 Revised 01/06 <br />