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• III IIIIIIIIIIIIIIII <br />STATE OF ~OLOlv~uv <br />Roy Romer, Governor <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Dlreetor <br />September 11, 1987 <br />Mr. Mark Heifner <br />37 E. Colorado Avenue <br />Denver, Colorado 80210 <br />Re: Pikeview Technical Revision No. 6 - File No. M-77-211 <br />Dear Mr. Heifner: <br />The Division has completed its review of the Pikeview Technical Revision No. 6 <br />submittal. <br />The review indicates that the proposed slide stabilization plan, with minor <br />modifications, should greatly enhance the stability of the slope. The <br />Division suggests that the following measures be incorporated into the <br />proposed stabilization plan: <br />- Rather than excavating the seep area near the toe of the slide, backhoe - <br />cut trenches should be established in this area draining to the toe. <br />These trenches, which should be excavated into the slide mass, should <br />either be packed with gravel, or have slotted PVC pipe installed <br />surrounded by a gravel pack. The trenches should then be refilled. the <br />excavation of discreet drainage trenches should provide adequate drainage <br />for the slide mass without relieving the toe support of the slide. <br />- The outflow from the processing plant area should be routed through the <br />design drainage to the settling pond, rather then being allowed to flow <br />across the shop bench. Limiting the amount of water available for <br />infiltration into the shop slope area will increase the inherent slope <br />stability. <br />Regarding the backfiliing of the old access road, it would appear that the <br />proposed topography of the backfilled area is acceptable. The Division's only <br />concern is that an adequate vegetative cover will not be established on this <br />material. The operator should make every attempt to secure an adequate supply <br />of a suitable topsoil replacement medium so that an adequate vegetative cover <br />can be established subsequent to completing the backfilling work. <br />The above concerns should be evaluated and incorporated into the Technical <br />Revision submittal. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203.2273 Tel. (303) 866.3567 <br />