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RULE 4 PERFORMANCE STANDARDS <br />........ ..... <br />4.12 Slides and Other Damage <br />Because of the mining technique used at the Colowyo operation and the inherent nature of the coal <br />geology, no natural barriers will be necessary. <br />At any time a slide occurs within the permit area which may have a potential adverse affect on public <br />property, health, safety, or the environment, Colowyo will notify the Division or other appropriate <br />governmental agencies and comply with any remedial measures necessary. <br />Higher than normal precipitation occurred in northwest Colorado in 1984 and 1985 causing numerous <br />landslides and slope failures throughout the region. One such slide occurred on a section of the paved <br />haul road and remedial actions were necessary to stabilize the area. For further information regarding the <br />remedial action, refer to Section 2.05.3 and Exhibit 17, Haul Road Facilities Modifications. This area has <br />remained stable since implementation of the remedial measures. <br />Rule 4 Performance Standards 4.12-1 Revision Date: 6/23/08 <br />Revision No.: MR-91