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~, <br /> <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Naweal Resources <br />1311 Sherman 51.. Room 215 <br />Denver, Colorado 80203 <br />Phone 003) 866-3567 <br />FA%:1303) 832-8106 <br />June 7, 1994 <br />Mr. Mark Kerr <br />Operations Manager <br />Landmark Reclamation, Inc. <br />4901 South Windermere Street <br />Littleton, CO. 80120 <br />RE: Adequacy Review, TR-10 <br />Rimrock Coal Company <br />Rimrock Strip Mine, Permit No. C-89-074 <br />Dear Mr. Kerr: <br />~ III IIIIIIIIIIIIIIII <br />~~~ <br />DEPARTMENT OF <br />NATURAi <br />RESOUIZCE~ <br />RoY Ramey <br />Guvernor <br />Ken Sala ear <br />C.ec ue vc DurU Or <br />Michael tl. lung <br />Division Direaw <br />The Division has reviewed the April 14, 1994 submittal for <br />Technical Revision No. 10 (reclassification of haul road to access <br />road and extension of the access road to the south boundary of the <br />permit area) and has the following questions or comments: <br />Rule 2.05.3 (3)(c)(i) states that mining permits shall contain <br />"Specifications for each road width, road gradient, road <br />surface, road cut, fill embankment, culvert, bridge, drainage <br />ditch, and drainage structure." <br />The submitted application does not include the specifications <br />for the access road as required by Rule 2.05.3 (3) (c) (i) . <br />Please submit the required specifications for the entire <br />length of the access road. <br />The cover letter submitted with TR-10 stated that drainage <br />from the disturbed area shall cross the access road by a <br />riprap lined Swale. The location of the Swale was indicated <br />on the submitted map titled "Final Topography". According to <br />the "Final Topography" map, at least one additional Swale <br />should be located approximately 570 feet further south from <br />the location of the first Swale. Please submit designs and <br />demonstrations for the two swales describing the dimensions <br />of the swales and size of riprap to be installed. Please also <br />include designs and demonstrations for the channels that will <br />convey flow from the swales to Sediment Collection Ditch 1. <br />The submitted revised page 45 of the permit titled "Access <br />Road Diversion Ditch Design" states that drainage from the <br />area west of the road will drain to the road and be diverted <br />north. The ditch design data is for the 2.7 acres of <br />undisturbed <br />