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Mr. Robert Diederich <br />Page 2 <br />January 25, 1982 <br />Full extraction mining is planned for each of these areas. The areas <br />will be subsided in accordance with the schedule outlined above. It <br />should be noted that the mining schedule may be changed as necessary in <br />order to insure an efficient mining operation. <br />If you have any questions concerning this matter, please contact me at <br />your convenience. <br />Sincerely, <br />Richard Mills <br />Environmental Engineer <br />RM:jjp <br />l~ <br /> <br />