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ARID-CONTINENT RESOURCES, INC. <br /> - FFlODUO1115 OF THE FAMOUS COAL BASIN COKING COAL <br /> BOX 158 <br /> CHICAGOOFFICE CARBONDALE, COLORADO 81623 TELEPHONE <br /> . 105 ADAMS STREET I3031963 2581 TWX <br /> TWX <br /> CHICAGO 60603 <br /> September 12, 1983 910 929 6894 <br /> RECEIVED <br /> 9109296891 <br /> Mr. Jim Herron V L_ <br /> 419�3 <br /> Mined Land Reclamation 5tN 1 <br /> 423 Centennial Bldg. <br /> 1313 ShermaiLSt. MINED LAND RECLAMATION DIVISION <br /> Denver, Colorado 80203 Coio, Dept. of Natural Resources <br /> Subject: Coal Basin Mines: File No. C-017-81 <br /> Subsidence Monitoring Network <br /> Dear Mr. Herron: <br /> I am writing you because I believe a revision to the subsidence monitoring provi- <br /> sions of our approved mine 'plan is appropriate and necessary at this time. <br /> Subsequent to the establisgent of our subsidence monitoring network, several <br /> unanticipated events have occurred at our mines which have caused me to <br /> re-evaluate our subsidence monitoring program. I refer to the following events: <br /> 1. Coal production h s been approximately 50 percent less than anticipated <br /> because of the we:k market for metallurgical coal. <br /> 2. The multilift lon wall mining demonstration project was relocated to <br /> the Dutch Creek No. 1 mine. Mining operations have begun. <br /> 3. The cessation of wining in- the L. S. Wood No. 3 Mine on August 1, 1982 <br /> and the Coal Basin No. 5 Mine on August 1, 1982. <br /> 41�1#IiThe DOE/USBM contact for detailed subsidence monitoring over the <br /> *mVltilift; longwa 1 project at, N6. 3 Mine was -cancelled and most of the <br /> Monitoring points removed (by the USBM without our prior knowledge) . <br /> S.'V Surface subsiden a of up to 1.27 feet occurred during the interval of <br /> ; August, 1981 thrtb August, 1983. (See enclosed copy of Mine <br /> Subsidence Engineering Co., Inc.) <br /> 6. Our request for a "surface subsidence release" from the U. S. Forest <br /> Service for forest lands adjacent to•our mine plan area was denied. <br /> At present, I do not think a determination of the "angle of draw" or the posi- <br /> tion of the U. S. Forest Service concerning adjacent lands are of first-order <br /> importance, becaui:e it will be several years before underground mining operations <br /> approach the permit bound ry and because I believe that following additional ." <br /> investigation and field observations the Forest Service will reconsider their <br /> initial position concerning subsidence on the forest lands adjacent to the <br /> present mine plan area. <br /> l <br />