2016-08-08_PERMIT FILE - C1981019A (14)

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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 the field engineer shall determine the need for control measures during construction. Such temporary and permanent control measures would include silt fences, straw bales, straw wattles, rock check dams, or other measures such as downstream sediment ponds. Additional design information for the Collom Haul Road is listed in the Construction Notes section of Sheet 3 of 10, on Map 25E. 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. 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 23B 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 and Section 25 sediment ponds, access roads will be constructed as shown in Volume 20, Exhibit 7, Item 23, Figures D1 and D2. These roads will be designed to meet the standards of CDRMS Rule 4.03.2 for Access Roads. They are specifically designed to meet the minimum design requirements while minimizing additional disturbed area and preventing environmental damage. Additional discussions of this access road may be found under Section 2.05.3(3). 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 D1 and D2. Any outslopes created from the construction of this access road will be seeded with the mix listed below, post construction. The access road cut/fill stabilization seed mix is as follows: Western wheatgrass @ 4 Lbs PLS/Acre Mountain Brome @ 4 Lbs PLS/Acre Kentucky Bluegrass @ 2 Lbs PLS/Acre Sanfoin @ 2 Lbs PLS/Acre Total 12 Lbs PLS/Acre Following construction, a report by a registered professional engineer shall be provided to the Division indicating that the roads have been built as designed. Following mining activities, the access roads may be request to remain in place as a private ranch road and therefore would not be reclaimed. Should the Collom — Rule 4, Page 2 Revision Date: 4/18/16 Revision No.: PR -04