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<br />- 2 - March 21, 1986 <br />Please direct the operator to perform a reconnaissance survey of the spoil <br />slope areas within 1,000 feet to the south, 1,000 feet to the east and 500 <br />feet to the west of slope/stability monument SP-2. In addition, direct them <br />to report the results of that reconnaissance in letter form as a supplement to <br />the 1985 subsidence survey report. I believe it appropriate to require that <br />this reconnaissance survey be completed and a report submitted within a month <br />of the date of mailing of your letter. <br />In my opinion, in all other aspects, the 1985 subsidence survey report <br />submitted by Twentymile Coal Company is clear, concise and thorough. The <br />company should be commended for its mechanical subsidence monitoring efforts <br />to date. <br />/tmb <br />cc: Mike Long <br />8566E <br />