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<br /> <br />• TECHNICAL REVISION REQUEST FOR THE WEST PIT AREA <br />WATERSHED BOUNDARY CHANGES AND ADDITION OF TWO DIVERSION DITCHES <br />The enclosed SEDCAD hydrology modelling runs for the addition of <br />the West Pit Coal Road Ditch and the Temporary West Pit Ditch are <br />necessary to allow topsoil stripping to occur for the development <br />of the West Pit mining area. <br />Enclosed, please find a cover page, SEDCAD diversion ditch sizing <br />calculations, modelling map, and updated Hydrology South Sheet, Map <br />12. It is intended that May 12 should replace the same map found <br />in the Colowyo Permit C-81-019, and that the remaining information <br />should be a supplement to and placed immediately after the existing <br />West Pit Pond section in Volume 3, Exhibit 7 Hydrology Information, <br />Section 8, Design of Surface Runoff Control Structures. <br />• <br />~R a9 Ap ~/,y/9~ <br />