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MINE ID # OR PROSPECTI~ ID#: M-1984-041 • PAGE: 3 <br />INSPECTION DATE: 1-26-00 INSPECTOR'S INITIALS: ACS <br />measures can be designed and implemented at any point during the life of the dump. <br />• The dump will be graded at the time of reclamation to blend with the sides of the gulch <br />and to outslope no steeper than 3:1. The dump will be topsoiled and revegetated. The <br />resulting outslopes will provide a high degree of stability against slope Failure and <br />erosion. <br />• During review of reclamation permit amendment AM-02 in 1990, the Operator provided <br />geotechnical testing results for the waste rock indicating an angle of internal friction <br />for the material on the order of 35 degrees. These test results indicate that the waste <br />rock is a very high shear strength material. It was observed during this inspection that <br />the end dumped waste rock stands at a high angle of repose. This observation serves to <br />ratify the results of the 1990 testing. <br />Based on the observations made during this inspection, the information provided by the <br />Operator, and the discussion presented in this report, the Division can approve the waste <br />rock dump proposed for the amendment AM-03 mining area. <br />The parking lot and lay down area associated with the mine maintenance shop was inspected. <br />It was observed that runoff from the lot has cut an erosion gully into a backfilled slope <br />leading down into the open pit. Drainage from the parking area must be redirected into a <br />non-erosive flow path. The operator suggested that the area could be graded to drain out of <br />the parking area at or near the access road and routed into the existing roadside ditch. This <br />plan appears to be feasible and capable of correcting the problem. See Problem PB-1 listed <br />on the last page of this report. <br />cc: Carl Mount, DMG <br />Gregg Squire, DMG <br />I & E Contact Address <br />NAME Steve Onorofskie <br />OPERATOR Centex Eagle Gypsum Company, L.L.C. <br />STREET P.O. Box 980 <br />CITY/STATE/ZIP Gypsum, CO 81637 <br />