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iiiiiiiiiiiiiiuiii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Govei <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />MEMORANDUM <br />\\6 July 1987 <br />T0: Tom Schriever ~ ~C~'-'~ <br />FROM: Jim Pendleton ` <br />RE: Somerset Mine ubsi nce & Water Quality Monitoring <br />bate N.O.Vo. No. C-87-012 <br />I have reviewed the letter submittal made by Kaiser Coal on June 22, 1987. <br />This letter reports subsidence monitoring results for the Hubbard Creek <br />subsidence monument line, performed on June 17, 1987, The monuments show <br />vertical and horizontal movements of up to 0.2 feet: In many cases the <br />movements have been upward. <br />The operator provides a footnote statement which explanis that these changes <br />were caused by a recent active landslide immediately uphill from the monument <br />installation. I have observed this active landslide during the last three <br />years. An ancient landslide existed on the slope and was exaccerbated by <br />Kaiser Coal exploration activities on the slope: <br />The monument grid in question has been in place since October, 1984. Visual <br />and survey monitoring has not detected any significant subsidence caused by <br />the limited mining beneath and adjoining Hubbard Creek. For this reason; <br />considering the cessation of mining within the underlying Somerset mine <br />workings, I do not believe it appropriate to require any remedial action at <br />this time. In the event that the Somerset were to be reopened we could <br />consider remedial treatments. <br />cc: Bob Liddle <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />