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Coal recovery in the South Area affected two drainage networks in the headwaters of Hubberson Gulch, as <br />. well as a ridge top that drains toward Sage Creek. One impacted drainage network is the Pond 016 <br />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 the <br />North and South Areas. The locations of the postmining channels are shown on Exhibit 20-2, Postmining <br />Topography and Drainage. The reconstructed drainage networks were designed and constructed to meet <br />the requirements of Rule 4.05.3. All of the channels will be permanent and were designed to safely convey <br />the peak runoff from the 10-year, 24-hour precipitation event. Designs for all postmining drainage channels <br />were calculated using the SEDCAD computer model. The postmining drainage channel designs are <br />presented in Tab 20, Attachment 20-1, Postmining Drainage Channel Designs. <br />Transportation Facilities <br />Haulage 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 access <br />road for the extreme north part of the mining area. Haul Roads H, I, J, K and I_ serve as access roaas to <br />coal recovery areas in the 11=W South Area. The locations of existing haul roads are shown on Exhibit 12-2. <br />Geotechnical investigations have been completed for Haul Road G and can be found in Attachment 13-3B, <br />Engineering Geologic Ground Stability Investigation, 005 Gulch and Vicinity (Haul Road G). Construction <br />summaries for the other haul roads are presented in Attachment 13-10, Haul Road Construction Summaries. <br />General Reouirements. 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 />State 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 presented <br />in Exhibits 13-11, 13-12 and 13-13, respectively. As-built plans of Roads F, G, H, I, J, K and L are depicted <br />on Exhibits 13-18.1A and 13-19.1A to 13-19.4A, 13-20.1A, 13-21.1A, 13-22.1A, 13-23.1A and 13-24.1A, <br />respectively. The haulage roads at the mine site are designed with appropriate ditches, grades, and culverts <br />to control erosion and runoff. Exhibit 13-10, Typical Road Details, and Figures 13-1, Typical Road <br />Embankment, and 13-2, Typical Road Cut, illustrates typical cut and fill sections of the haul roads. All <br />haulage roads will be constructed basically "on-grade" and road location will be partially limited by <br />TR-59 13 Revised 05/07 <br />