2017-09-07_PERMIT FILE - C1981019A (4)

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RULE 4 PERFORMANCE STANDARDS surrounding areas, and will be designed in such a manner to safely pass peak runoff from a 10 year, 24 hour precipitation event (Please see Exhibit 24, Item 1 — Collom Haul Road 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. Additional design information for the Collom haul road is shown on Maps 25E Sheets 1 through 4 and Map 25F. This road is designed to meet the applicable haul road regulations as well as internal road design guidelines while minimizing additional disturbed area and preventing environmental damage. 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 are two haul roads that will be constructed out of the Collom Pit to haul overburden materials from the pit to the temporary overburden stockpile. These are shown on Map 25D and are designated as the East and West Haul Roads. These roads will be constructed to meet the applicable portions of Rule 4.03.1 for Haul Roads. Both the East and West Haul Roads are designed to allow large mining equipment access and egress to and from the pit area, and both haul roads will allow access to the bottom of the pit. Once these haul road intercept the crest of the mining limit, these roads will be designed to meet internal road design guidelines while minimizing additional disturbed area and prevent environmental damage. All truck routes constructed within the immediate mining area will be exempt from any construction specifications, since roadways within the immediate mining pit area are not included within the code of Colorado Regulations Definition of "road" (Rule 1.04(111)). Out of pit haul roads such as those identified on Map 25D will be designed and constructed in accordance with Rule 4.03.1. 4.03.2 Access Roads In order to obtain access to the Section 26, Section 25, Section 33, and Middle sediment ponds, access roads will be constructed as shown in Volume 18B, Exhibit 7, Item 23, Figures D1 and D2. 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. 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: 8/14/17 Revision No.: MR -177