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RULE 4 PERFORMANCE STANDARDS <br />Tri-State Generation and Transmission Assoication, Inc. (Tri-State), owns and operates a 345 kV power <br />line which is located within the permit boundary and is shown on Map 22. Tri-State is required to <br />maintain proper phase to ground clearences under all their power lines, and will be conducting ground <br />disturbances activites within their 150' right-of-way, within the permit boundary, in two approximate <br />locations as shown on Figure 4.12-3. The final loctions will be determined by Tri-State. These ground <br />disturbing activites are not associated with the Colowyo Mine and will not be required to be permitted <br />and bonded for in accordance with Rule 3.02.1(2). <br />In February of 2016, the Colowyo Mine site experienced a very high wind event which snapped a power <br />pole off at the base and left the power pole dangling from the line. Colowyo constructed an emergency <br />road into the pole location (0.4 acres of disturbance) to access the location, stabilize the line, and replaced <br />the broken pole. Topsoil was windrowed with a dozer down gradient of the road footprint to minimimze <br />surface water flow from the area of disturbance to native areas. Once ground conditions allow access, the <br />entire road footprint will have the topsoil re -spread on the area, and it will be seeded in accordance with <br />the approved reclamation seed mixture. Please see Figure 4.12-4 for a location of the emergency road <br />that was constructed to repair the power pole. <br />Rule 4 Performance Standards 4.12-2 Revision Date: 02/23/16 <br />Revision No.: MR -151 <br />