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<br />The 200 foot separation from significant man-made structures is excessive for the relatively shallow, <br />proposed excavation, the planned mining and closure slope angles, and the relatively level grade beyond <br />the slopes. In our opinion the minimum setback from the edge of the excavation for utilities, drainage <br />easements, access roads, and public right-of-ways should be a minimum of 30 feet. With this 30 feet <br />setback distance, a potential slope of 2.75:1 (horizontal to vertical) would exists from the toe of the <br />deepest portion of the pit to the closest man-made structure. Following closure, the slope would be <br />3.75:1 lapproximately 15 degrees). <br />This completes the geologic evaluation of the proposed Railhead Pit. Any questions may be directed <br />to Senior Geotechnical Engineer, Gary Hamacher, or Geologist, Lee Eversole. <br />Respectfully Submitted, <br />Western Color o T//esting, Inc. <br />~c~i ~ ~.aeC~/ <br />Lee F. Eversole <br />Geologist <br />Reviewed By: <br />Gary L. Hamacher, P.E. <br />Senior Geotechnical Engineer <br />16710 <br />Nom: <br />2.9 <br />OF C <br />6 <br />