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.~ <br />Apri16, 2001 <br />Steve O'Rrian <br />Fnvimnment, Inc. <br />7985 Vance Drive, Suite 205/ <br />Arvada. Colorado •R0003 <br />AE: 3&H Mine _ <br />Platteville, Colorado. <br />PEI No. 01-006114.0 <br />Dear Mr. O'Brian: <br />You forwarded to ma a portio <br />and Geology, regarding infon <br />been presented to them. Que! <br />mitigate the impacts of floodi <br />.available data. specifically, th <br />U.S. Army Corps of Engineer <br />The following chart reflects tl <br />the depths of Clow as they i!ttj <br />STORM ESTIMA4 <br />FRFiQUENCY. , R/' <br />South land <br />Of Sites <br />100- ear 28 ()00 <br />500-yeai 49 000 <br />• South end and ell but tho as <br />Based upon this information, <br />measures utilized would inolt <br />1. Keeping the dry pit slopci <br />Phone <br /> <br />iti received from the Division of Minerals <br />in reviewing the application that has <br />s what specific measures will be taken to <br />tendations based upon my review of the <br />er Basin Flnnd Shtdy prepared by the <br />'dated April 1977, <br />,.. <br />expected velocitios, rho flow rotes and <br />TMATED.AVG. ESTLMATED <br />l'TH OF FLOW VELOCITY <br />feet s) <br />uth North Snttth Nortl <br />id• _ End Endue End <br />.2 _ _ <br />3.0 1.5 to 2.0 3.G <br />,4 4.7 l,b to 2.5 5.0 <br />rho site. <br />ommendation that tha mitigation <br />n order of priority: <br />pe of 1:1. <br />eley, C:U t7U631 <br />t~ix (97U) :i5fi-6486 <br />~: ., <br />£0d WdSI:S T00Z 60'1dtj 66SL £Zb £0E : '°N 3NOHd '~NI '1N3WNOaIf1N3 WO~d <br />