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C~ ~ r~~~,~ ~~~ ~~~~~~~~~~~~~~~~ <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getchee, Ezacutiva Dlractor <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Dlractor <br />Richard D. Lamm <br />Governor <br />DATE: May 21, 1984 <br />T0: Gregg Squire <br />FROM: Anne Baldrige ~~~ <br />RE: Edna Mine Landslide: On-site Observations and Suggested Necessary <br />Long-Term Evaluation <br />This memo is to address observations made <br />specifically related to the landslide. My <br />incorporated into the inspection report as <br />reiterate obvious observations that Philip <br />I. Observation <br />on May 17, 1984 at the Edna Mine <br />observations and comments can be <br />you see fit. I have tried not to <br />will include. <br />The landslide is defined by three boundaries; on the northeast by <br />unreclaimed spoils, on the southwest by natural ground and on the <br />southeast by an existing haul road. There are several springs <br />emanating from the slope above the haul road in the area of the <br />slide. These springs appear to contribute most of the flow in the <br />haul road drainage ditch. The haul road drainage ditch crosses <br />under the haul road south of the slide area and empties into the <br />drainage which eventually flows past the toe of the slide. <br />2. According to P&M personnel, there were three separate lobes forming <br />the toe. The northernmost toe was the most accessible. I walked <br />across this portion and examined the portion of the slide in the <br />next drainage. The knob of undisturbed land immediately adjacent to <br />the northernmost toe has experienced some small-scale slumping and <br />seepage is evident along the slope especially between the powerline <br />road and the main access road. Whether this was a pre-existing <br />condition or occurred as a result of the slide I could not determine. <br />The slide in the second drainage appears to have been a flow type <br />slide concentrated mainly in a small, steep slope area. The slide <br />that came down this slope was probably only 15-20 feet wide. The <br />slide broke an existing power pole in half and stopped at the berm <br />of the main access road as it bends around and crosses the <br />drainage. The aerial photos show a pond at this point and it <br />appears that this pond may cross the road through a culvert. Some <br />ponding is occurring but the drainage has cut through and around the <br />slide. The water in the drainage is not crossing the road through a <br />culvert, if one even exists. A channel has cut through the road on <br />the far side and another channel has cut through below the <br />previously mentioned area of seepage. These channels may be a <br />result of high runoff and not of the slide. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30'x) 866-3567 <br />