Laserfiche WebLink
The testing procedure for determining adequacy of road base will require that, prior to testing, the upper 8 inches be <br />scarified and re -compacted. The material will be compacted to 95 percent standard Proctor and the road will be proof - <br />rolled to determine if any soft spots exist that will require additional work. The Mine will provide the Division with the <br />results of surfacing material durability testing and haul road stability design parameters, for the Division's approval, <br />prior to reconstruction of Haulroad A. The Mine will also provide professional certification for the haulroad(s) prior to <br />the roads being placed in use. Once this is completed, the road will be re -surfaced with durable material, such as crushed <br />red rock or gravel, capable of handling the anticipated vehicle load. The road surface will have a minimum width of 20 <br />feet, and drainage will be provided by grass lined borrow ditches which already exist along most of the length of the <br />road. <br />If coal haulage resumes, a connecting haulroad would be constructed to the north of the existing Warehouse Yard, as <br />shown on Map 27. Prior to construction, soil would be salvaged (estimated at approximately 325 cy) and stockpiled in <br />the existing stockpile northeast of the Warehouse Yard. The southern toe of the existing soil material stockpile would <br />be removed and the soil placed further to the north of the pile. Fill material (approximately 500 cy) would be hauled in <br />to bring the road up to its design grade. The fill material would be obtained from the overburden stockpiled adjacent to <br />the refuse pile. The road would be extended from the existing rock -dust tank pad and connect with the Coal Laboratory <br />parking area. The existing culvert would be extended under the road, and a rock headwall or similar type structure <br />would be constructed around the outlet. A 16-inch culvert would be placed under the haul road to drain water that will <br />collect in the low area between the haul road and the Warehouse Yard pad. <br />Upon completion of mining, Haulroad A will be reclaimed by removing the surfacing material and small fills and <br />blading the road to blend with the surrounding topography, culverts will be removed and disposed of, and the associated <br />disturbance areas he area will be re -seeded with the rangeland seed mixture. The haulroad adjacent to the Warehouse <br />Yard pad and coal processing area will be reduced to a width of 20 feet and left as a permanent road for access the to <br />haylands post mining. The fill material will be used in backfilling the portal area and the area will be topsoiled and <br />seeded with the appropriate seed mixture. A wide turn -around area will also be left at the South end of the haulroad to <br />aid in the postiming landuse allowing for an area for large agricultural equipment storage and turnaround. <br />MCM plans to retain several roads to support postmining land uses, following completion of mining and reclamation <br />activities, as shown on Maps 29 and 29A, Reclamation Plan. These roads include the main entrance road from State <br />Highway 13, a section of the old highway, and a connecting road, and will provide access into the irrigated haylands <br />along the Williams Fork River, the pastureland at the former No. 9 portal/refuse area, and the rangeland/wildlife areas <br />at the former No. 5A portal area and the former refuse pile. The maj ority of these roads are former haulroads and County <br />roads transferred by the previously referenced County agreement which are on MCM- or State-owned lands. Prior to <br />site reclamation, MCM will submit a revision consistent with the requirements of Rule 4.03.1(1)(f) and (g) requesting <br />permanent retention of roads, and providing documentation from any affected surface owner(s) of their concurrence <br />with permanent road retention. <br />Ponds, Impoundments, and Diversions <br />A system of ditches, embankments, and ponds, have been designed and constructed to retain runoff from disturbed areas <br />throughout the mining operation. All ditches, culverts, and ponds were designed by Mineral Resources and Engineering, <br />Inc. and each pond and structure was designed and constructed under the supervision of a qualified, registered <br />professional engineer. <br />The general drainage system layout is shown on the Drainage and Sediment Control Map (Map 26), and includes a total <br />of 23 dams or embankments which have been constructed to control runoff from disturbed areas, or to serve as settling <br />ponds for mine discharge water. A series of ditches and culverts were designed as a part of this system to gather and <br />convey runoff flows. Each sedimentation pond has been designed to retain and treat runoff from the 10-year/24-hour <br />precipitation event and to meet all requirements under the performance standards of Section 4.05 Hydrologic Balance. <br />The design methodology and calculations used for all ditches, culverts, and ponds, and the bridge crossing the Williams <br />Fork River are included in Exhibit 18, Drainage and Sediment Control Plan. Ponds 9A-P1, 9A-P2, 9A-P3, and 9A-P4 <br />are the only permanent impoundments currently identified for retention under this permit. <br />TR20-38 2.05-16 Revised 09/14/20 <br />