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- 0198 16:59 ID:powderhorn coal co FAX:9704647181 III IIIII~IIIIIIIIII <br />Isss <br />POWDERHORN <br />COAL COIYEPANY <br />CRDA 2 Diversion Ditch <br />Certiftcntion of Construction <br />P.0.0oR 790 <br />P.rw.,oob.ms~seo <br />lams ~-Aa+ <br />F.. (Qro>.M.>tal <br />1 Larry M. Reschke, PE, do hereby certify that the raconstrvction of the Cameo Refuse <br />Disposal Area 2 (CRDA 2) diversion ditch was conatnrcted in accordance with plans <br />submitted to and approved by rho Colorado Division of Minerals and Geology es <br />Technical Revision No, 24, CRDA 2 Diversion This design cart be found on Pages <br />CRDA2-l2 through CRDA2-13q, Appendix ] 3-2, Volume 3, of Pawderhorn's Miniag <br />and Reclamation Permit Application No. C-81-041. <br />Reconstruction of the ditch began January ?A, 1998 and was completed on January 22, <br />1998. The ditch was graded with both trepemidal and V-ditch configurations. <br />] lovations ware taken on the inside of ditch and ilia upper embankment on 50' intervals <br />along the 2200' of ditch to verify that the grade was within dcsigtr limitations and that the <br />outside embankrttent height was adequate to meet the design flow depth. Elevations were <br />taken at other locations between the 50' stations if there was any question about the grade <br />or embankment height. The resulting grades were generally 0.25% to 0.5°!° with a few <br />shoe intervals between 1.0°x6 and 2.0% (all stepper grades were within the maximum <br />allowable for that segment of ditch). There ware a few low spots (less than 9") that were <br />tell but care was taken to make sure the adjacent embankment was adequate to Kandla the <br />resultiag higher flow depth. These low spots will silt-into grade sometime in the future. <br />1, <br /> <br />1 ' Z.Z- jf~ <br /> <br />