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stable. For the purpose of examining road cuts and road embankment conditions, the <br />operator looked at the worst -case road segments at the mine. <br />The roads at the mine were designed for proper road drainage as well as compatibility <br />with the sediment control system. A few access and light -use road segments did not <br />require roadside drainage ditches to collect runoff due to the fact that the grade is only <br />two to five percent. An example is the access road on the southeast edge of the surface <br />facilities area. Roads were pitched to allow sheet runoff to disperse into adjacent <br />grassland. <br />On steeper roads, roadside drainage ditches are used to collect runoff and safely <br />discharge it. Much of the runoff from the roads is passed through a sedimentation pond <br />to decrease suspended solids. Culverts are provided at intersections with drainage <br />channels so as not to interfere with the natural stream flows. <br />The permittee's design for the road bridge that crosses the Williams Fork River <br />indicates the bridge will safely pass the river flow resulting from a 100 -year storm <br />event. <br />The Division is removing a previously - granted variance from culvert spacing <br />requirements for haul roads and access roads that apparently existed in the regulations at <br />some time in the past. As these requirements do not appear in the 2014 version of the <br />regulations, such a variance is no longer required. <br />Several roads in the permit area are proposed to be retained as permanent features. <br />These roads are shown on Map 29: Reclamation Plan. The roads include the main <br />haulroad leading from State Highway 13 to the No. 5 portal; old Highway 13, which <br />provides access to the No. 5A portals; and a portion of road at Williams Fork Strip Pit. <br />If there is interest from the County, Old Highway 13 may be returned to Moffat County. <br />MCM must provide the documentation required by Rule 4.03.1(1)(f) and 4.03.2(1)(g) <br />for these roads to remain as permanent features. Prior to Bond release, MCM must <br />submit this documentation and include it as part of the permit application through a <br />revision. <br />IL Hydrologic Balance - Rule 4.05 <br />A. Small Area Exemptions (SAEs) <br />Map 26 in the permit application shows the disturbed areas where the Division has <br />previously approved exemptions from the requirement to pass drainage through a <br />sediment pond or treatment facility, as allowed in Section 4.05.1(4). All <br />calculations and demonstrations for SAEs are found in Exhibit 18 of the permit. <br />Each exemption was granted based on: small area, no mixing of surface drainage <br />with discharge from underground mine workings, and sediment ponds or treatment <br />facilities are not necessary for the drainage to meet the effluent limitations of <br />4.05.2 and applicable State and Federal water quality requirements for receiving <br />waters. The small area exemptions are listed below. <br />Williams Fork Mines 19 Permit Renewal 06 <br />C- 1981 -044 December 8, 2014 <br />