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S TJTE OF OOLOaGDO uq: r.:.Nn ii i •'. .. ..~,~. <br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monte Pascoe, Eaecative Dir ec ror <br />MLyED LAND RECLA;II.4'I'ION <br />423CentennialBuilding, 1313ShermanSireet <br />Denver, Colorado 80203 Tel. (303) 856-3567 <br />fill iiiiiiiiiiiiiiii <br />999 <br />David C. Shelton <br />Director <br />PfFr`70RANDU"1 <br />DATE: April 16, 1982 ~ / <br />~ / ,~ <br />T0: Edward Bischoff (/..,~ /( <br />FROM: Rov L. Cox I ~ <br />P.E: Portal and Entry Sealing Plan, Ammended Section 3.5.2, Responsz to <br />Stipulation No. 20 and 38, ARCO Coal, *it. Gunnison PIo. 1 Mine, Permit <br />No. C-007-80. <br />ARCO Coal Company submitted a detailed portal and entry sealing plan for <br />the Mt. Gunnison No. 1 mine on November 18, 1981. 'this submittal was in <br />response to the two follocving stipulations: <br />Page 17 Stipulation No. 20 <br />THE APPLICANT PfUST PRESENT PLANS SHOIJING HOLD P1INE OPENINGS (JILL BE <br />SEALED TO PREVENT UNCONTROLLED MINE DISCHARGES UPON COMPLETION OF MINIKG. <br />THESE PLANS SHALL BE SUBMITTED 'f0 THE REGULATORY AUTHORITY SI;{ (6) <br />MONTHS AP'fER COMPLETION OF THE 'THREE (3) PORTALS INITIALLY PROPOSED <br />TO BE INSTALLED AND THEIR ASSOCIATED DEIJATERING FACILITIES. <br />Page 45 Stipulation No. 38 <br />ARCO COAL MUST SUBMIT TO THE DIVISION PLANS AND SPECIFICATIONS IN <br />ADEQUATE DETAIL, TO DEMONSTRATE THAT THE PPOPOSED SEALING METHODS LJILL <br />NOT INTERFERE WITH OR INTERRUPT THE PEIu`tANEPJT OPERATION OF THE DRAINGAGE <br />SYSTEAf. THESE PLANS MUST BE SUBMITTED BY SEPT&'IBER 30, 1981 IN THE CASE <br />OE PLANS POR THE CAPPING OP WELLS AND, It: THE CASE OF PLANS FOR TUE <br />SEALING OP PORTAT.S, SUCH PLANS ^tUST BE SUBPff9'TED SIX (6) MONTHS AFTER <br />COMTLETION OF '1'lIL•' THREE (3) P01:'l'ALS .T.NI'CIALLY PROPOSED 1'0 hE IPISTALLIiD <br />AND THEIR ASSOCIATED DE4JA1'ER1N0 FACILI'C~[ES. <br />Two sealing schzmes are presented, one for non-toxic and another for toxic- <br />mine drainage. The scheme proposed for the handling of non-toxic mine <br />drainage entails a controlled discharge of mine water through 4 inch PVC <br />pipes. The scheme proposed for the handling of toxic mice drainage entails <br />the placement of three perminent water tight seals, one at the mine openings, <br />one in the mine entry ways under the Dry Fork of Pfinnesota Creek, and another <br />in the mine entry ways under the South Prang Drainage Basin. These three <br />