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• iii iiiiiiiiiiuiii <br />DEPARTMENT OF NATURAL RESOURCES <br />Davitl H. Getches, Executive Director <br /> <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richartl D. Lamm <br />Governor <br />MEMORANDUM <br />~ecember 1984 <br />T0: Jim Herron <br />FROM: Jim Pendleton .~ <br />RE: Powderhorn Coat omp ny's Subsidence Monitoring Report - September 1984 <br />The above referenced report presents the subsidence monitoring survey data <br />from the subsidence monitoring network installed above the underground <br />workings of the Roadside Mine. The survey results submitted are acceptable. <br />The data accumulated to date demonstrates vertical subsidence maxima on the <br />order of 3.7 feet, which is in keeping with the projections included within <br />the approved Permit No. C-U41-81. <br />A number of subsidence monuments in the vicinity of Ute Water District <br />Facilities are indicated as having been destroyed during construction <br />activities. The operator must reinstall and recommence survey monitoring of <br />these monuments. I appreciate the difficulty entailed in maintaining <br />monument at ion in such areas. However, because of the nature of the public <br />water supply facilities involved, it is imperative that the operator continue <br />monitoring of subsidence within these areas, as required by their approved <br />permit. <br />cc: Brian Munson <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />