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C <br />TWENTYMILE COAL COMPANY <br />Foidel Creek Mine <br />April 10, 1986 <br />To: Larry Damrau <br />From: Michael Joseph Astuto - Mine Surveyor <br />Subject: Supplement to the 1985 Annual Subsidence Survey <br />Report - File No. C-82-056 <br />A surface reconnaissance survey was conducted on April 9, 1986, <br />as requested, of the surface spoil areas within a 1,000 feet to the <br />south, 1,000 feet to the east and 500 feet to the west of monument <br />SP-2, to determine if there is any evidence of differential movement <br />in the backfill spoil. <br />There is no apparent evidence of differential movement in the <br />spoil that I can easily detect. Since no significant movement has <br />occurred with monument SP-2 for almost two years, and there is no <br />apparent differential movement on the surface of the spoils area, <br />the logical conclusion is that monument SP-2 and SP-1 initially <br />experienced significant movement because of local consolidation <br />effects of the backfill spoil. <br />Sincerely, <br />~/~;c~~i~.~(''CGk=gam <br />Michael J. Astuto <br />Mine Surveyor <br />