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. , , ,, • • <br />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 Erodibiliry Flydrologic <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 />~ea~,.w._ G~'~ Date: ~/i~ /9 7 <br />Colorado Registration Number ~907~.. <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 />~Qj,DO Rf~~S' ( 1 X 1l~ <br />G~f`E~NBG r~9 ~~ t/L~ <br />LeeAnn Bush, P.E. G~~~ 9 Charles H. Robinson <br />Senior Engineer ~` 2~J2 i Associate <br />LAB/CHR/rtm <br />81EP'.9T31 )81±ItBEM] I?A Golder Associates <br />