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RULE 4 PERFORMANCE STANDARDS <br /> <br />South Taylor – Rule 4, Page 2 Revision Date: 7/21/25 <br /> Revision No.: MR-267 <br /> <br /> <br />Roads that will be constructed in the actual mining areas will constantly change as the operation progresses. <br />The “in-pit” roads will be maintained by a motor grader and regularly wetted to minimize dust as required by <br />the air quality permit. Any drainage off the "in-pit" roads will be retained in the pit or diverted to the <br />drainage and sediment control structures located on Map 33B and in Exhibit 7, Hydrology. <br /> <br />Colowyo will maintain the haul roads throughout the life of the mine with repairs including blading, filling of <br />potholes, and replacement of road surface as necessary. Likewise, watering for dust control will be <br />implemented as necessary. Other information relevant to haul roads is provided in the existing permit. <br /> <br />4.03.2 Access Roads <br /> <br />Other than the Sturgeon Access Road, there will be no changes to existing access roads for the South Taylor <br />pit expansion. <br /> <br />The existing two-track Sturgeon Road will be upgraded to allow access for construction and for routine <br />monitoring and maintenance. Map 25B provides the road design information for Sturgeon Access Road. <br /> <br />The Sturgeon Access road cut/fill stabilization seed mix is as follows: <br /> <br /> Western wheatgrass @ 4 Lbs PLS/Acre <br /> Mountain Brome @ 4 Lbs PLS/Acre <br /> Kentucky Bluegrass @ 2 Lbs PLS/Acre <br /> Sanfoin @ 2 Lbs PLS/Acre <br /> Total 12 Lbs PLS/Acre <br /> <br />Following construction, a report by a registered professional engineer shall be provided to the Division <br />indicating that the road has been built as designed. Following all mining activities, the road will remain in <br />place as a private ranch road and will not be reclaimed. Colowyo as the land owner has provided the Division <br />with a letter documenting this request. <br /> <br />4.03.3 Light-Use Roads <br /> <br />This section is discussed in Volume 1. There will be no changes to this section resulting from the South <br />Taylor pit. <br /> <br />4.04 SUPPORT FACILITIES <br /> <br />Please see Sections 2.05.3 and 4.04 in Volume 1. <br /> <br />4.05 HYDROLOGIC BALANCE <br /> <br />4.05.1 General Requirements <br /> <br />Please see Section 4.05.1 in Volume 1. <br /> <br />In addition to the mining, reclamation, and treatment methods referenced in this Section, further protection of <br />the hydrologic balance will be established by an on-going plan for monitoring potential changes in surface <br />water quality and quantity and groundwater quality. This monitoring plan is described in Volume 15, Section <br />4.05.13 and the monitoring locations are graphically shown on Map 10B. Excess spoil valley fill areas are <br />located up-dip from mining and reclamation areas and periodic monitoring for seeps and springs and periodic <br />monitoring of piezometer wells will detect the formation of spoil springs.