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of.co� <br /> DEPARTMENT OF NATURAL RESOURCES <br /> * ( 1 * David H.Getches,Executive Director <br /> *876 MINED LAND RECLAMATION DIVISION <br /> lg� D"ID C.SHELTON, Director <br /> r <br /> Richard D.Lamm <br /> Governor <br /> March 9, 1984 <br /> Mr. Doug Bowman <br /> Mid-Continent Resources, Inc . <br /> P.O. Box 158 <br /> Carbondale, Colorado 81623 <br /> RE: Stipulation No. 4 Response - Sealing Rock Tunnel Adits, <br /> File No. C-017-81 <br /> Dear Mr. Bowman: <br /> The Division has completed a review of the proposed plan for sealing the <br /> aquifers in the Rock Tunnel Adits . Seals are proposed near the adit surface <br /> opening and slightly downgrade from each of three identified aquifers; the <br /> Cozzette, Rollins , and Middle Sandstones. The geotechnical design <br /> calculations are in conformance with the prudent state-of-the-art. However, <br /> additional seals above the three identified aquifers will be needed to prevent <br /> ground water from entering other strata between the seals. <br /> As presently designed, the Rock Tunnels would eventually be completely filled <br /> with water between the seals. Of particular importance is sealing-off the <br /> tops of the Rollins and Middle Sandstones . Without these seals, water from <br /> the two aquifers would eventually enter the mine workings. A revised plan for <br /> sealing the rock tunnels should be submitted as soon as possible. A <br /> compliance deadline will be imposed during the next scheduled inspection. <br /> If you have any questions or comments please give me a call . <br /> Sincerely, <br /> AJiHerron <br /> Reclamation Specialist <br /> JH/ep <br /> Doc. No. 9964 <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel.(30111 866-3567 <br />