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iii iiiiiiiiiiiii iii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Governor <br />D'.PARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C- SHELTON, Director <br />July 8, 1987 <br />Mr. William P. Balaz <br />Kaiser Coal Corporation <br />102 South Tejon, Suite 800 <br />Colorado Springs, Colorado 80901-2679 <br />Re: Somerset Mine - June Subsidence Report for Hubbard Creek Monuments - <br />NOV No. C-87-012 Abatement - Fiie No. C-81-022 <br />Dear Bill: <br />Jim Pendleton has reviewed the June 17 subsidence monitoring results for the <br />Somerset Mine. The monuments show vertical and horizontal movements of up to <br />0.2 feet. In many cases the movements have been upward. These movements are <br />reported to be the result of a recent active landslide immediately uphill from <br />the monument installation. Prior to development of the Hubbard Creek <br />facilities an ancient landslide existed on the slope. This landslide was then <br />exacerbated by U. S. Steel exploration activities. The recent active slide <br />has been observed by Mr. Pendleton during the past several years. <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, the Division does not believe it appropriate to require any remedial <br />action at this time. In the event that the Hubbard Creek workings are <br />reopened we may consider remedial treatments. <br />Thank you for your cooperation in completing the June 17 survey. <br />Sincerely, <br />~~~-~~~ <br />Thomas A. Schreiner <br />Reclamation Specialist <br />TAS/1 a1 <br />0936E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 l'el. (303) 866-3567 <br />