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999 <br /> © CLIMAX MOLYBDENUM COMPANY COLORADO OPERATIONS <br /> Climax Mine <br /> A Division of Cyprus Climax Metals Co <br /> Hwy.91 <br /> Climax,Colorado 80249 <br /> (719)486-2150 <br /> Fax-(719)486-2251 <br /> October 21, 1996 2 5 1996 <br /> Certified Mail No. P 291 415 923 <br /> ./ a)IVI;;ilJll V� I•illrl(�I%�I`J(k U(IW IIJ�U <br /> Mr. Allen Sorenson I� <br /> Division of Minerals and Geology <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> RE: 4-Dam ee Water Return S difications, Submittal of detail for <br /> passage of containment through 4-Dam, Climax Mine, Permit No. M-77-493 <br /> Dear Mr. Sorenson: <br /> Attached are the details you requested in your October 14, 1996 letter concerning <br /> passage of leak containment from a modified 4-Dam Seep Pumpback System through <br /> the 4-Dam embankment. I have also attached an October 9 letter from W. W. Wheeler <br /> &Associates that discusses the criteria upon which Climax will construct the <br /> embankment collars and pipe passage. <br /> The containment passage begins on the east side of 4-Dam with a 4 inch perforated <br /> pipe laid between STA. 16+80 and STA. 17+20. The perforated pipe will be imbedded <br /> into the lined trench to a clay barrier positioned at the emergency spillway and above <br /> high water mark of the Eagle Park Reservoir at STA. 16+80. At the clay barrier, a <br /> transition from perforated pipe to solid wall drain pipe will be constructed. The solid wall <br /> pipe will convey containment waters across the spillway and through 2 concrete collars <br /> at STA's 15+00 and 15+30 to STA. 14+20. There will then be another transition to <br /> perforated pipe at the west side of the dam extending 30 feet into gravel bedding and <br /> lined trench. I have attached topographic and cross sectional stationing as weii as a <br /> pipe trench section and cutoff collar detail for your records. <br /> Please contact me if you have any questions. Climax will provide a certification report to <br /> follow these modifications. <br /> Sincerely, <br /> Bryce R. Romig <br /> Environmental Coordinator <br /> Climax Mine and Mill <br />