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RULE 4 PERFORMANCE STANDARDS <br />a manner to safely pass peak runoff from a 10 year, 24 hour precipitation event (Please see Exhibit 24, <br />Item 1 —Culverts). During construction of the Collom Haul Road, the field engineer shall determine the <br />need for control measures during construction. Such temporary and permanent control measures would <br />include silt fences, S -fence, straw bales, straw wattles, rock check dams, or other measures such as <br />downstream sediment ponds. <br />At the request of Moffat County an elevated roadway crossing will be installed where the Collom haul <br />road crosses Moffat County Road 51 (CR -51). Once the elevated crossing is installed, CR -51 will allow <br />public traffic to cross over the top of the Collom Haul Road. An equipment corrider will be installed <br />adjacent to the elevated crossing to provide large equipment access from the exisiting mining areas to the <br />Collom mine. Design details for this elvated crossing can be found on Map 25F. <br />The Collom Haul Road heavy equipment traffic will cross CR -51 at grade. Only non -production mine <br />traffic will utilize the at grade crossing. All normal light vehicle and coal haul traffic will be separated <br />from CR -51 by an overpass. The at grade crossing will employ typical signage as well as visual indication <br />on the CR -51 approach to the intersection at adequate distance to warn the public of the intersection and <br />potential interaction with mine equipment. Crossing gates to the haul road will be kept in the closed <br />position preventing access to the Collom Haul Road by non -authorized personnel to restrict access onto <br />the Collom Haul Road. When the Colowyo Mine vehicles approach to cross CR -51, gate(s) will close to <br />the CR -51 traffic, then gate(s) will open to the haul road allowing the mine vehicles to pass. Access to <br />the haul road gates will be through authorized Colowyo staff only with appropriate measures to ensure <br />that the public cannot readily open the gates. <br />There are three haul roads that will be constructed out of the Collom Pit to haul overburden materials <br />from the pit to the temporary overburden stockpile. These are shown on Map 25D. These roads will be <br />constructed to meet the applicable portions of Rule 4.03.1 for Haul Roads. <br />All three haul roads are designed to allow large mining equipment access and egress to and from the pit <br />area, and the haul roads will allow access to the bottom of the pit. Once these haul road intercept the crest <br />of the mining limit, these roads will be designed to meet internal road design guidelines while minimizing <br />additional disturbed area and prevent environmental damage. All truck routes constructed within the <br />immediate mining area will be exempt from any construction specifications, since roadways within the <br />immediate mining pit area are exempt for construction specifications in accordance with Rule 1.04(111). <br />Out of pit haul roads such as those identified on Map 25D will be designed and constructed in accordance <br />with Rule 4.03.1. <br />4.03.2 Access Roads <br />In order to obtain access to the Section 26, Section 25, Section 36, and Middle sediment ponds, access <br />roads will be constructed as shown in Volume 18B, Exhibit 7, Item 23. <br />Use of these access roads will be for routine environmental monitoring and maintenance activities. <br />Typical road use would consist of several trips per week by a light use vehicle using one way travel and <br />low speed. For design information of the access roads please see Exhibit 7-23 Figures D1 and D2. Any <br />outslopes created from the construction of this access road will be seeded with the mix listed below, post <br />construction. <br />Several temporary access roads will be constructed to allow access to construct the west side sediment <br />control system and to temporarily haul topsoil to a stockpile. These temporary access roads will be <br />constructed in accordinace with Volume 18B, Exhibit 7, Item 23, Part D. Any outslopes created from the <br />construction of this access road will be seeded with the mix listed below, post construction. <br />Collom — Rule 4, Page 2 Revision Date: 4/2/18 <br />Revision No.: RN -07 <br />