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-,~ <br />Colorado Department of Transportation May 1, 1996 <br />Re: Rule 4.20.3 Public Notice <br />The identification of specific areas in which mining will take <br />place are shown on a portion of the mine plan map to be included in <br />the permit revision. The dates of mining activities for the areas <br />shown would be in the next two years. Mining will be done with <br />standard mining practices, and no special or unusual measures will <br />be taken to prevent or control adverse surface effects. All mining <br />will be conducted in accordance with the requirements of the <br />Colorado Division of Minerals and Geology. <br />Additionally, Oxbow Carbon and Minerals, Inc. is considering <br />applying for a new Federal Coal Lease for an area to the north and <br />east of Federal Coal Lease COC-53510. In preparation for applying, <br />we are considering a base-line information program which may <br />include drilling and seismic monitoring. Due to the rugged nature <br />of the terrain, drilling will probably be limited to two holes near <br />the highway, at approximately the location shown on the attached <br />drawing. <br />Seismic monitoring would consist of a long line of cable attached <br />at intervals to sensitive microphones, known as geophones, and a <br />vibration source. The vibration source can be as simple as a large <br />hammer, or a small explosive charge similar to a large firecracker. <br />The vibration is started just below the surface of the ground, and <br />is monitored by the geophones as it is reflected off the different <br />layers in the ground below. <br />The seismic monitoring program would be completed in several <br />phases, consisting of an initial calibration and verification test <br />around existing drill holes, followed by a single-line test along <br />the highway for easy access, and then depending on the results of <br />the tests, there may be additional monitoring north of the highway <br />in Section 6, T13S, R89W. We would need your approval to conduct <br />the single-line test along the highway. <br />Please feel free to call me at (970) 929-5122 if you have any <br />questions. We will be pleased to deal with any concerns you may <br />have, and thank you for assistance. <br />Sincerely, <br />Thomas C. Anderson, P.E. <br />Environmental Coordinator <br />cc: Jim Stover, J.E. Stover and Associates <br />Anthony J. Waldron, Colorado Division of Minerals and Geology <br />Ao~W 2 . <br />