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Sttliaz ~ 2.05.3 the performance standards under Rule 4.03 are, therefore, not applicable. Road plan and profile • configuration is shown by a Facilities Detail Map, (Map series 2.05-M3x). Use as a haul road was limited to a short initial period of time during conveyer construction and then «casional use for emergency haulage if the conveyor is down. These limitations on use are important because road design and constmction are to be based on geometric criteria appropriate for the anticipated volume of traffic and weight and speed of vehicles. A 12-foot wide road with passing sections would not be appropriate for long-term use as a haul road. Given, however the intended short-term and «casional use as a haul road, the haul road width and configuration are adequate. Long-term and predominant use of the road will be as an access road for transportation of men, equipment, and supplies to and from the mine portak. The road design is consistent with and acceptable for long-term rue as an access road. The first segment of the Sanbom Creek Mme haul road extends from the Sanbom Creek Mute portak to the west approximately 1,300 feet. This segment is located north of the rel«ated railroad grade. A portion of this segment is 1«ated on the old railroad sub-grade which is on grade with no embankment slopes and a cut slope to the north. The road continues to the west between the cut slope to the north and the rel«ated railroad grade to the south. This road segment is relatively flat (<5 percent grade) and narrow, with one-way traffic from the portak to a tttm-out area near the mine water treatment pond and a two-waypassing zone at it's western end. The second segment of the Sanbom Geek Mine Haul Road extends approximately 800 feet from the end of the fast section just west of Sanbom Creek to the East Yard. This segment is constructed on fill along the route of the old road entrance to the East Yard with a cut slope on the north side and an embankment on the south. The road embankment was constructed on an old haul road previously used for coal haulage from the old Beaz No. 1 and 2 Mutes to the Somerset Mine. Except for the two-way passing zone at iu eastern end, this segment u relatively narrow and limited to one-way • traffic. Road grade for this section is approximately 5 percent. The third segment of the Sanbom Geek Mute haul road extends approximately 1,900 feet from the west end of the second segment at the east end of the East Yard to a point where the road joins the second segment of the main entrance road near the dump station. This road segment traverses the East Yard area and is of sufficient width to allow two-way traffic. This segment also has a turn-out near the East Yard Pond and ties in with the East Yard coal st«kpile area. This segment of road u mostly on grade and relatively flat (<5 percent grade) and open except on it's eastern end where it is confined between the cut slope to the north and the fill embankment on the south. A new access road segment was constntcted south of [he Sanbom Geek Mme overland conveyor to divert traffic around the East Yard coal st«kpile area. The access road extends from the second segment of the main entrance road to the east approximately 1,000 feet where it ties into the third segment of the Sanbom Creek Mme haul road. In this area, a section of the conveyor a elevated as a traffic underpass. The access road u generallyon grade except for a small fill in the tie-in area on the outslope of the East Yard. Drainage control measures for the fast two segmenu of the Sanbom Creek Mme haul road include roadside ditches and cross-culverts as shown on a Facilities Detail Map (Map series 2.05-M3x). Drainage control for both the third segment of the haul road and the ass«iated access road is provided by existing drainage and sedimentation control measures for the East Yard area. The Sanbom Geek Mtne haul road and conveyor corridor cross over Sanbom Creek A 36inch diameter steel ctilvert, placed in the road embankment during constmction, is designed to safely pass the 10- yeaz, 24-hour design flow for this ephemeral drainage. The outlet of the Sanbom Geek culvert crossing ties into an existing I-pighway Department culven. A second 3(rinch diameter culvert was installed in the haul road near the Somerset Mme portals. This culvert will carry mn-off from the portion of the haul road east of Sanbom Creek and upland areas. R«k or concrete headwalls have . been constmcted to protect the inlets of the 36-inch culverts from erosion. A riprap channel was ako constructed at the outlet of the second culvert to ~*+~~~rt,~~e eroston as illustrated by the Drainage and Sediment Control Map, (Map 2.05-M4). Design calculations for all drainage structures are provided in Exhibit 2.05-E3, Drainage and Sediment Control Plan. PR04 2.05-26 Revised August 2000