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III IIIIIIIIIIIIIIII <br />999 <br /> <br /> <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />1317 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: 13031 866-3 567 <br />FA%:13031 832-8106 <br />August 26, 1994 <br />STATE OF COLORADO <br />I~rb~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />Ms. Kathleen Welt Kensala=ar <br />Mountain Coal Company E.ecuove Dnec mr <br />P. O. Box 591 Michael B. Long <br />Division Director <br />Somerset, CO 81434 <br />RE: Minor Revision No. X34 (Stipulation No. 53 from Technical <br />Revision No. 69); West Elk Mine; Permit No. C-BO-007 <br />Dear Ms. Welt; <br />The Division has reviewed Mountain Coal Company's (MCC) application <br />for the above referenced minor revision. The application provides <br />design information regarding the Lone Pine Gulch ventilation fan <br />which was approved with conditions (TR~69). With the submittal of <br />this revision, MCC has complied with Stipulation No. 53. <br />The Division's adequacy comments are provided below in the order <br />presented in the application. <br />1. The plan view and cross section of the reclaimed fan <br />bench are provided and will be included in Exhibit 42A. <br />2. The small area demonstration for this area was received <br />from Greystone on August 15, 1994. The Division also <br />reviewed the small area demonstration for the Lone Pine <br />substation, which was submitted following the approval of <br />Minor Revision No. 122. The fan area will be addressed <br />first. <br />A. The Division assumes that the topsoil pile will be <br />seeded and mulched. Please verify. <br />B. The CP factor for the gravel pad should be changed <br />from 0.005 to 0.05, as per the help screens in <br />SEDCAD+ Version 3. 1. This change effects the model <br />for the "Lone Pine Fan w/Assoc Cut Slope Using <br />Mulch, Strawbales & Litter Filter" and "Lone'Pine <br />Gulch Staging Area Bench". <br />C. The CP factor for the mulched cut and fill slopes <br />should be changed from 0.003 to 0.03, as per the <br />help screens in SEDCAD+ Version 3.1. This change <br />