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2011 ANNUAL HYDROLOGY REPORT <br />Permit No. C -82 -056 <br />Submitted to: <br />Colorado Division of Minerals and Geology <br />Denver, Colorado <br />Submitted by: <br />Twentymile Coal Company <br />Oak Creek, Colorado <br />March 2011 <br />I: \ENVIRONMENTAL \AHR \2009 \TCC \TEXT \Contents2011 <br />