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• , iii iiiiiiiiiiiiiiii <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: (303)866-3567 <br />FAX: (3031832-8106 <br />December 30, 1992 <br />Mr. Basil Bear <br />Somerset Mining Company <br />P.O. Box 535 <br />Somerset, Colorado 81434 <br />RE: Somerset Mine, File C-81-022, TR-10 Adequacy Review <br />Dear Mr. Bear: <br />OF ~~ <br />wte ;4 <br />lBi6 <br />Roy Romer <br />Governor <br />Michael B. Long <br />Drviyion DIIMOr <br />The Division has reviewed Somerset Mining Company's latest adequacy review response <br />received in our office on December 24, 1992. Further clarification is required on several of <br />the responses; therefore, SMC will need to request an extension of the TR-10 decision <br />date. A date of January 15, 1992 should provide adequate response time. <br />The Division's comments to the latest response letter are as follows: <br />1.-13d. Responses acceptable <br />13e. The Division will stipulate the approval of TR-10 upon the future submittal of <br />a technical revision to address the reclamation estimate issue. <br />14.-19 Responses acceptable <br />20a. & b. It is apparent that several culverts and ditches remain as part of the uppe <br />Upper Hubbard Facility proposed post-mining land use. Please provide <br />calculations that indicate the existing culverts and ditches are adequate to <br />handle the 100-year, 24-hour storm event or submit a plan with calculations <br />and designs that establish drainage control adequate to handle such an <br />event. <br />The berm to be established along the existing road is considered to be an <br />inadequate sediment control structure. The Division suggests that SMC <br />utilize some other form of sediment control during the reclamation liability <br />period such as silt fencing or more preferably a small incised sediment pond. <br />The pond alternative prevents the need for a small area exemption <br />demonstration. <br />STATE OF COLORADO <br />20c. The Division requests that Somerset Mining Company address reclamation of <br />drill hole 6349 in the upcoming Permit Renewal application which is due in <br />our office on April 1 1 , 1993. <br />