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ATTACHMENT B <br />• <br />~\ <br />,~ 6~ <br />fNGINEERS• <br />~.`AU ICJ i <br />\~~ <br />MICHAEL BAKER, JR., Ir~C. <br />ENGINEERS AND SURVEYORS <br />Two MARKET TOWER, SUITE 9+1 <br />7025 SOUTH PARKER ROAD <br />AURORA. COLORADO BOO~a <br />TELE PMOME. ]0},54+95E <br />,• <br /> <br />6pri1 t2, t?8t: <br />Na. Larry Wisneski <br />anaconda Minerals Company <br />555 - t7 Street <br />Deaver, Colorado 80202 <br />Subject: West Elk Coal Company <br />Retaining Wall <br />Dear Mr. Wisneski: <br />The retaining wall designed by our firm shown on Draxiag Numbers <br />MG-O1-2-00, 5-001 - S-C11 and C-001 - C-002 and outlined in the technical <br />specifications is designed for the following conditions: <br />a. Loads <br />Equivalent Fluid Pressure = X15 lbs/cubic feet <br />Weight of Soil = 120 lbs/cubic feet <br />Live load = 2.5 feet <br />b. The wall design is not dependent upon the passive resistance of the <br />soil oe the down hill face. <br />c. The structural stabllity of the wall is designed to be dependent upon <br />deep, predrilled, concrete encased, soldier beams embedded is competent <br />bedrock. <br />It is therefore our professional opinion based upon accepted engineering <br />procedures and practice that the call should perform as designed provided <br />that proper construction quality control, field inspection and construc- <br />tion of the wall is in compliance with the design drawings. <br />We believe this letter should be sufficient for your submittal to the <br />State, however if you have need of additicaal clarification please don't <br />hesitate to contact us. <br />~"= =~ <br />l" ° '~ <br />~, rp0 •~Er_. <br />Sincerely, <br />MICSpEL BP.KEA, JA., INC. <br />r; <br />David J. Greenwood, P.E. <br />CO-PE dt?773 <br />Haaager of Engineering <br />Denver/Rocky Mountain Aegioao <br />DJG:lb <br />