HYDRO23423 - Laserfiche WebLink

Home Browse Search

STATE OF COLORADO qiC HngD D. LAbtM ~avemm DEPARTMENT OF NATURAL RESOURCES D. Monte Pascoe, Executive Director iVIINED LAND RE(1LAA'IA'TION 423 Centennial Building, 7313 Sherman Street Denver, Colorado 80203 Tel. (303)8 E;6-3567 April 28, 1982 111IIIIIIIIIIIIIIII 999 David C. Shelton Director TO: Rich Dorm ngue `~ ~~, (~~n``'~~--- FROAf: Jim Pendleton ~ z'~ "'- RE: Visitation o the lue Ribbon h7ine Site Dave Shelton and I visited the Blue Ribbon mine site on Tuesday, April 13, 1982. We met with Marv Adams of western Associates, Inc. and xen Meyers of Rocky Mountain Geotechnical, Inc. We examined the portal bench and highwall land- slide and rockfall areas. Ravinq closely examined the site, I am now more receptive to the company's contention that the major cause of Iandsliding of the portal bench is surface water infiltration. Drainage of the mine bench is next to non-existent, causing water to impound and infiltrate in numerous locations. In addition, both sewer and water supply lines appear to have ruptured either slightly before or following the original Landslide movement. Both of these situations undoubtedly contributed additional water to the already saturated bench materials. I recommend that we proceed as follows: 1) Require Blue Ribbon Coal Company to complete an appropriate surface drainage redesign of the portal bench area. 2) Following approval of that design, require installation of the appropriate facilities and regrading of the bench as soon as possible. Obviously, the company will have to work around the Large existing coal stockpile now in place on the portal bench. 3) Require the company to cease stockpiling coal immediately adjacent to the portal bench lip, Coal should be removed from those areas currently threatened by the slide, and should not be placed closer than ,l0 feet to the bench lip. 9) The company should redesign the sewer and water lines serving the portal bench. We discouraged the reinstallation of lines outside the currently disturbed area below surface. [/e suggested that the company investigate the installation of sewer and water lines above ground in insuldted jackets. [9e also examined the area disturbed by Blue Ribbon Coal Company last fall, to the south of the existing portal area. The company received a Notice of Violation for bulldozing an old access road to an abandoned fan portal. A large portion of the affected slope is nova actively Iandsliding. Head scarps were obvious up to 200 feet above the original road cut. I recommend that we require that this area be included within the indicated disturbed areas in the permit. Further, I recommend that we require bonding for resolution of this problem prior to reclamation and bond release. /mt cc: c?d Bischoff Dave ShcZton