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RULE 2 PERMITS <br />minimize erosion. An elevated haul road crossing will be installed at Moffat County Road 51 at the <br />request of Moffat County (See Map 25F). This elevated crossing will ensure the general public traffic is <br />separate from the mail haul road traffic, and will take Moffat County Road 51 over the top of the Collom <br />haul road. An equipment crossing adjacent to the elevated crossing will allow large equipment movement <br />from the Collom mine to the existing operations (See Map 25F). <br />Overall grade of the Collom haul road will not exceed l OH: l V with a horizontal alignment consistent <br />with the existing topography. Ditches, erosion controls, and culverts will be used to minimize impacts to <br />surrounding areas, and will be designed in such a manner to safely pass peak runoff from a 10 year, 24 <br />hour precipitation event (Please see Exhibit 24, Item 1 — Collom Haul Road Culverts). <br />Additional design information for the Collom Haul Road is listed in the Construction Notes section of <br />Sheet 3 of 4, on Map 25E. This road is specifically designed to meet the applicable haul road regulations <br />as well as internal road design guidelines while minimizing additional disturbed area and preventing <br />environmental damage. Design information can be found on Map 25E. The Collom haul road will have <br />an overall width of approximately 100 feet, with a 28 foot paved running surface as shown on the typical <br />cross-sections (Map 25E Sheet 2). <br />Asphalt pavement specifications shall be based on a 30 year design life with a 18" thick base course <br />(gravel) and 7.0" asphalt thickness. The pavement design is based on 50 ton coal haul trucks with axle <br />loads of about 81 psi. This specification assumes an R-20 silty sand subgrade material. Base course shall <br />be CDOT Class 6 aggregate. A 6 foot high berm shall be used at all locations where the roadway is <br />elevated. Cut slopes shall be 0.25H: IV or less when completed in competent rock. Elsewhere, cut <br />slopes in unconsolidated materials shall be laid back at 2H:1 V or less as directed by the field engineer. <br />Requirements for fill placement shall be as specifically described in Rule 4.03.1 Haul Roads (3) (e) `Road <br />embankments". A ditch shall be installed at toe of all cut slopes. If needed, temporary erosion control <br />measures shall be implemented during construction to minimize sedimentation and erosion until <br />permanent control measures can be established. <br />There are two main haul roads that will be built to haul overburden materials from the pit to the <br />temporary overburden stockpile. These are shown on Map 25D and are designated as the East and West <br />Haul Roads. Please see section 4.03.1 for details pertaining to these two haul roads and haul roads that <br />will be constructed within the mining area. <br />Four access roads will be constructed to support mining operations at the Collom mine. Two will access <br />the Section 25 and 26 sediment ponds, one will be utilized to access the facitlities area during constructin <br />of the Collom haul road, and one will be utilized to access the Collom haul road from the Jubb Creek <br />entrance off of Moffat County Road 32. The locations and typically design information for these access <br />roads are shown in Volume 18, Exhibit 7-23,Part D, Figures D1 through Figure D5. <br />2.05.3 (4) Operation Plan — Ponds, Impoundments, and Diversions <br />To control runoff, and protect surface and ground water quality, Colowyo will construct several new <br />sedimentation structures and diversion ditches. All ponds, impoundments, and diversions are designed to <br />meet or exceed the requirements of 2.05.3(4) and 4.05.6. All sediment ponds will be constructed and <br />maintained in accordance with the parameters mentioned in Volume 1, Section 2.05. Impoundments will <br />be inspected quarterly as discussed in Section 4.05.6. Please see Exhibit 23, Item 1 — Geotechnical <br />Report Collom Temporary Spoil Pile and Pond and Exhibit 23, Item 2. Also refer to Exhibit 7, Item 25 — <br />Collom Post Mine Channel Design; Exhibit 7, Item 23, Part C — Collom Pond Design Maps; and Exhibit <br />7, Item 23 (for information pertaining to diversion channels during mining) for specific designs and <br />locations of these structures. <br />Collom — Rule 2, Page 77 Revision Date: 12/30/16 <br />Revision No.: TR -108 <br />