2020-07-09_PERMIT FILE - C1981019A (8)

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RULE 4 PERFORMANCE STANDARDS a manner to safely pass peak runoff from a 10 year, 24 hour precipitation event (Please see Exhibit 24, Item 1 —Culverts). During construction of the Collom Haul Road, the field engineer shall determine the need for control measures during construction. Such temporary and permanent control measures would include silt fences, S-fence, straw bales, straw wattles, rock check dams, or other measures such as downstream sediment ponds. At the request of Moffat County an elevated roadway crossing will be installed where the Collom haul road crosses Moffat County Road 51 (CR-51). Once the elevated crossing is installed, CR-51 will allow public traffic to cross over the top of the Collom Haul Road. An equipment corrider will be installed adjacent to the elevated crossing to provide large equipment access from the exisiting mining areas to the Collom mine. Design details for this elvated crossing can be found on Map 25F. The Collom Haul Road heavy equipment traffic will cross CR-51 at grade. Only non-production mine traffic will utilize the at grade crossing. All normal light vehicle and coal haul traffic will be separated from CR-51 by an overpass. The at grade crossing will employ typical signage as well as visual indication on the CR-51 approach to the intersection at adequate distance to warn the public of the intersection and potential interaction with mine equipment. Crossing gates to the haul road will be kept in the closed position preventing access to the Collom Haul Road by non-authorized personnel to restrict access onto the Collom Haul Road. When the Colowyo Mine vehicles approach to cross CR-51, gate(s) will close to the CR-51 traffic, then gate(s) will open to the haul road allowing the mine vehicles to pass. Access to the haul road gates will be through authorized Colowyo staff only with appropriate measures to ensure that the public cannot readily open the gates. There is one haul road that will be constructed outside of the Collom Pit to haul coal to the coal stockpile area and primary crusher (please see Map 22B for stockpile and crusher locations). This haul road is shown Map 25D and is designated as the Collom Coal Haul Road. The Collom Coal Haul Road is designed to allow large mining equipment access and egress to and from the pit area to the coal stockpile and coal crushing faciltiy. Once this haul road intercept the crest of the mining limit, within the Collom Pit, it will be exempt from any construction specifications, since roadways within the immediate mining pit area are exempt for construction specifications in accordance with Rule 1.04(111). The Collom Coal Haul Road will be designed and constructed in accordance with Rule 4.03.1 as shown on Map 25D. Temporary haul roads and in-pit haul road will be utilized to support mining will be developed within the Collom Pit and the Temporary Spoil Pile area. These roads will constantly be changing and moving as the Collom pit advances and as the Temporary Spoil Pile is constructed. In accordance with Rule 1.04(111)these roads will be exempt from design specification required under Rule 4.03.1. They will be designed to Colowyo's internal haul road design standards for the equipment that will be operating on them. 4.03.2 Access Roads In order to obtain access to the Section 26, Section 25, Section 36, and Middle sediment ponds, access roads will be constructed as shown in Volume 1813,Exhibit 7, Item 23. Use of these access roads will be for routine environmental monitoring and maintenance activities. Typical road use would consist of several trips per week by a light use vehicle using one way travel and low speed. For design information of the access roads please see Exhibit 7-23 Figures D 1 and D2. Any outslopes created from the construction of this access road will be seeded with the mix listed below, post construction. Collom—Rule 4,Page 2 Revision Date: 7/23/18 Revision No.: TR-124