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9: <br />STATE OF COLORADO gKHnRD ~. L~ Govemm III III III III IIII III <br />sss <br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monte Pascoe, Executive Director <br />MIlVED LAND RECLAMATION <br />423 Centennial Building,1313 Sherman Street <br />Denver, Colorado 80203 Tel. (30$) 839-3567 <br />David C. Shelton <br />Director <br />June 16, 1981 <br />T0: Brian Munson <br />FROM: Jim Pendleton <br />SUBJECT: Geotechnical a Vis' ti on to Munger Canyon and McClane Canyon <br />Coal Mine Pe it as. <br />Pursuant to your request Jerry Zimpfer and I met with Sheridan Enterprise <br />representatives (Bill Bozworth and Mark Wehneman)and Mike Bukovansky of <br />Geo-Hydro Consultants on Monday, June 8th. Based upon that site visitation <br />I forward the following comments for your consideration. <br />Munger Canyon <br />Mike BukoLensky verbally presented the results of his mapping of Munger <br />Canyon permit area during our visit. The waste pile, access roads and mine <br />portal are all located to varying degrees upon, or adjacent to, ancient <br />landslide deposits. The only evidence of modern slope stability problem is <br />seen on over steepened cuts adjoining the access road. <br />Mike Bukovansku, based upon this information, suggested that Sheridan Enterprise <br />modify its current proposed design for the road in order to minimize additional <br />excavation of the already over steepened slopes. I agree with Mr. Buko4ensky's <br />suggestions. Bill Bozworth indicated that Sheridan would utilize Mr. Bukouansky's <br />opinions in future redesign. I will require such design revisions prior to <br />approval of the Munger mine application. <br />The northern portion of their proposed waste pile is located adjacent to a <br />similar ancient landslide deposit. Mike Buko ansk alluded to the inclusion <br />of this land form in the stability analysis to be performed by his firm for <br />Sheridan Enterprises. I will scutinize that stability analysis to determine <br />propriety of the stability analysis when it is forwarded to my attention. <br />The operator's representatives also described the company's intention to extend <br />the mine portal bench in order to obtain additional working space. I indicated <br />that I would require a stability analysis of the bench, which must achieve <br />the required reclaimed static slope stability factor of 1.3. Jerry Zimpfer <br />also reminded the operator that particular attention should be focused upon <br />the channel of the existing intermittentstream as it crosses that extended <br />portal bench. <br />The final topic of discussion at the Munger Canyon site was the reclamation of <br />the access roads and the mine portal bench upon cessation of mining. I observed <br />that the effected areas appear to qualify as "steep slope areas". In such cases <br />