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February 27, 1997 -5- 963 -2178 <br />• runoff results in concentrated flows, occasional sampling will be conducted by Mountain <br />Coal Company to verify the effectiveness of the erosion control features. Features of the <br />SAE will be regularly inspected and repairs will be made as may be required to maintain the <br />integrity of the SAE. <br />REFERENCES <br />Soil Conservation Service, 1983. Soils of Colorado, Loss Factors and Erodibility Hydrologic <br />Groupings. <br />Schwab, Pamela, 1992. SedCAD, Version 3.1 Software Package. <br />CERTIFICATION <br />This certification applies to this office SedCAD+ analysis, based on filed information <br />provided by Eric Mende (Civil Engineer), West Elk Mine, Mountain Coal Company and <br />other sources of information as referenced in the above documentation. The analysis is good <br />engineering practice, and conclusions reached, based on the information provided, are valid <br />to the best of my knowledge. <br />�Qi� Date: x-41 -7 l9 7 <br />Colorado Registration Number a 90 7.) <br />If you have any questions or comments please feel free to contact the undersigned at <br />(303) 980 -0540. <br />Sincerely, <br />GOLDER ASSOCIATES INC. <br />LeeAnn Bush, P.E. <br />Senior Engineer <br />LAB /CHR/rtm <br />8\61:\96\2178 \2178EMI LTR <br />D0 Rr� <br />N I iv c <br />Charles H. Robinson <br />� ' Associate <br />< •f° <br />s7 �NAl. <br />Golder Associates <br />