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ENGINEER CERTIFICATION <br />I, Stephen R. Hinkemeyer, being a registered professional engineer <br />in the State of Colorado do hereby certify that based on my <br />professional expertise, and the information provided to me by Mr. <br />Juan Garcia regarding theoretical hydrological modeling assumptions <br />arrived at through negotiations with the Colorado Division of <br />Minerals and Geology, the following information has been reviewed <br />by me and is true and correct to the best of my knowledge. <br />l.) The table titled "COLOWYO COAL COMPANY, INITIAL WEST PIT <br />BOXCUT TOPSOIL STRIPPING, INITIAL STRIPPING AREA DRAINAGE <br />ANALYSIS, (ASBUILT AS OF SEPTEMBER 28, 1994" approximates <br />the hydrologic control as of September 28, 1994. <br />2.) The drainage structure #1, West Pit Sediment Pond is <br />adequate to contain the predicted runoff or sediment <br />resulting from a 10-year, 24 hour precipitation event <br />occurring in drainage area #1. <br />3.) The drainage structure #2, West Pit Sediment Pond is <br />adequate to contain the predicted runoff or sediment <br />resulting from a 10-year, 24 hour precipitation event <br />occurring in drainage area #2. <br />4.) The drainage structure #3, West Pit Sediment Pond is <br />adequate to contain the predicted runoff or sediment <br />resulting from a 10-year, 24 hour precipitation event <br />occurring in drainage area #3. <br /> <br />~° ~""G°~;.9~:~tephen R`! Hink <br />s:~L. E. No. 25436 <br />25436 ~:~._ <br />~~,,,~~ ~ 7~ «.ti y <br />Date <br /> <br />