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DRAVO ENGINEERS, INC. <br />• Dravo Builtl~ng <br />1250 14th $ir eel <br />Denver, Colorado 80202 <br />303 893-4500 Telex. 45-930 <br />A Dravo Company <br />JAN 0 51983 <br />7~UNED LAND RECLAMATION <br />COlO. DEPT OF ~IAT.URAL RESOURCES <br />RE: Application for Permit to Conduct Coal Mining in Colorado <br />Snowmass Coal Company <br />North Thompson Creek Mines and Loadout Facility <br />October 1982 <br />I certify that to the best of my knowledge, the engineering designs and <br />calculations included on the following drawings (listed below) were completed <br />using sound engineering practices: <br />D-4-1 Areal Extent of Underground <br /> Date printed: 2-9-81 <br />D-2-4 Loadout Site D rainage <br /> Date printed: 1-26-81 <br />D-4-5 Drainage Plan Schedules <br /> Date printed: 1-27-81 <br />• <br />D-4-6 Drainage Plan Sections and Details <br /> Date printed: 1-27-81 <br />D-4-7 Drainage Plan, West End of Mine Site <br /> Date printed: 1-27-81 <br />D-4-8 Drainage Plan, East End of Mine Site <br /> Date printed: 1-27-81 <br />D-4-10 Dam Cross-Sections Site Plan <br />Date printed: 1-27-81 <br />D-4-12 Refuse Disposal Pile Sections - Spillway Section <br />and Prufile <br />Date printed: 1-27-81 <br />D-2-3 Loadout Area - Haul Road Drainage <br />/~ Date printed: 2-25-81 <br />' Donald'A. Mathison ~ D e <br />Chief Engineer, Civil <br />Dravo Engineers, Inc. <br />• Colorado P.E. No. 11773 <br />Dravo <br />2-25 <br />