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6/e::t Elk Coal Company, Inc. <br />Post Office Boz 591 <br />Somerset, Colorado 81434 <br />Telephone 303 929 5015 <br />November 19, 1990 <br /> <br /> <br />NOV 2 8 1990 <br />Ms. Susan J. McCannon <br />Colorado Mined Land <br />Reclamation Division <br />1313 Sherman St, Room 215 <br />Denver, CO 80203-2273 <br />Re: Semi-Annual Subsidence Survey Data <br />Dear Susan: <br />tulined Land <br />Reclamation Division <br />West Elk Coal Company, Inc. (WECC) completed surveys of the F <br />Seam subsidence monitoring panel in June and October of 1989 and <br />1990. Raw data for the 1989 surveys were submitted earlier this <br />year. Since then, data from last year's and this year's surveys <br />were entered into our spread sheet program. In this format, the <br />data are easier to review and also provide the changes in the <br />Northing, Fasting and elevation of each survey station from the <br />average pre-mining survey results. <br />WECC still plans to submit a revision application to reduce <br />monitoring frequency to once a year. This will probably be some <br />time after the first of the year. <br />Please do not hesitate to contact me should you have questions. <br />Sincerely, <br />~. ~ ~~~ <br />Kathleen G. Welt <br />Environmental Engineer <br />KGW/mer <br />Attachment <br />CC: J.L. Coffey <br />>RC -n»6 <br />