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Bleeder Shaft Pad Drainage Ditches <br />Watershed Area = 4.25 ac <br />10-year, 24-hour storm = 1.8 in <br />CN = 89 (Gravel on pad -Hyd. Soil Gp. D) <br />CN = 63 (Undisturbed areas -Hyd. Soil Gp. C) <br />CN = 80 (Topsoil pile -Hyd. Soil Gp. D) <br />All other design input parameters are shown on the attached SEDCADT^' 4 printouts. <br />CERTIFICATION <br />I, Richard Spotts, state that the information presented in the Bleeder Shaft Pad <br />Small Area Exemption (SAE) Report for Twentymile Coal Company was prepared <br />by me or by persons under my supervision and is correct to the best of my <br />knowledge and information. <br />Water & Earth Technologies, [nc. <br />~ ~~~~~:~ <br />Richard Spotts, <br />President <br />Principal Engineer/Hydrologist <br />C~ <br />