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West Elk Mine 2006 Annual Hydrology Report 50 <br />Wright Water Engineers Inc. (WWE), 2005. Memorandum, Preliminary Environmental and Health <br />Risks Associated with the Release of Sily-Ex Fire Fighting Foam Concentrate to <br />Minnesota Creek on November 12, 2005. December 2005. <br />• <br />• <br />December 2007 HydroGeo, Inc. <br />