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CONTRaCTORS <br /> ENGINEERS <br />~...,, GEVEI.OPERS <br />~::= MORRISON-KNUDSEN COMPANY, INC. <br />~,,,~y;, <br />.._- <br /> EXECUTi`iE OFFLE <br /> iw0 MORR150N~KNUGSEN PL.>Za <br /> ~ O EOx '308. 6015E CanO d7729 • U 5 + <br /> ?NONE 12081 ]ai-5000 TEL__`.X J6d+79 <br />~4ay 6 , 1982 <br />Powderhorn Coal Company <br />P. 0. Box 1430 <br />Palisade, Colorado 81526 <br />Attention: Bruno A. Redolfi <br />Chief Engineer <br />. Subject: Engineering Report <br />Access Road Culverts <br />P. 0. No. 2216 <br />REP!°TO MORPt50N-KNUCSE"+LOMPnNY. 'NC <br />MINING GROUP <br />7aJ HORIZON COURr <br />MOP120N PORK PVZa <br />GRaNO :UNCTION. COLORa00 et50t <br />Enclosed please find the subject report. You will note that the <br />existing culverts will handle a 10 year 24 hour precipitation event but <br />they will not handle a 20 year 24 hour precipitation event. <br />One of the culverts is slightly damaged on its upstream end. In <br />order far the calculations to be valid the damage needs to be repaired. <br />You should also survey the road embankment south of the culverts to <br />assure that water will pond at the road embankment with three feet of <br />freeboard and not run around the road to the south. <br />Very truly yours, <br />MORRISON-IUlUDSEN COMPANY, INC. <br />/ - _- <br />~~J'. E. Stover <br />Project Manager <br />Enclosure <br />• JES:djr <br />13-1-17 <br />