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III IIIIIIIIIIIIIIII <br /> <br />CERTIFICATION <br />I do hereby certify that I have reviewed and independently <br />checked the hydrologic and hydraulic calculations performed by <br />Dr. J. S. Fifield, of HydroDynamics, Inc. in the report, "Coal <br />Ridge No. 1 Mine New Castle, CO: Hydrologic Analysis of the Coal <br />Loading Facility," February 19, 1991. I have personally <br />conferred with Dr. Fifield on the calculations and conclusions. <br />It is my professional opinion that the calculations were <br />performed to acceptable professional standards and I agree with <br />Dr. Fifield's conclusions on the drainage control structures with <br />one exception. It is my professional opinion that it is <br />unnecessary to construct a berm along side the offsite drainage <br />ditch on the west side. The existing conditions of the 42" <br />Corrugated Metal Pipe culvert at the entrance to the site are <br />adequate to pass the 25-year, 24-hour peak flow without <br />construction of a berm. If NCEC chooses to build the berm, it <br />will provide a higher level of flood protection than the 25-year <br />event. <br />.`~~~ `0 \II LLlq M~~ii,,~ <br />- ~~ = <br />5655 `~~_ <br />~~~'uggrninnnpW~~O <br />C~ <br />Edward Ro y, .E. <br />May 6, 1991 <br />G/5~91 <br />