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FIRST-HALF 2005 SUBSIDENCE REPORT <br />the second in September 2005. Associated surface sites will be sampled for water quality <br />at the same time. This data will be evaluated and provided in the Second-Half 2005 <br />Subsidence Report. <br />V. Conclusions• <br />Structures remained essentially unaffected during the period with the exception of the <br />predicted impacts to the UPRR and Fish Creek from first-half 2005 mining. No adverse <br />impacts, i.e. imminent failure of structure, were evident with regard to these structures. <br />Subsidence monument surveys disclosed no unusual developments during the reporting <br />period. Subsidence magnitudes and projected draw angles were within the anticipated <br />ranges previously documented for the azea. The angle of draw in the North Mining <br />District ranges between 17.0 to 19.5 degrees as follows; <br />1. Survey data over the 13-Right panel indicates the angle of draw to be approximately <br />19.4 degrees in the vicinity where the railroad track crossed the headgate entry. <br />2. Survey data indicated the angle of draw to be approximately 17.6 degrees for the 14- <br />Right panel in the vicinity where the railroad track crossed the headgate entry. <br />3. Survey data over the 15-Right panel indicated the angle of draw to be approximately <br />18.8 degrees in the vicinity where the railroad track crossed the headgate entry. <br />4. Survey data over the 16-Right panel indicated the angle of draw to be approximately <br />18.3 degrees in the vicinity where the railroad track crossed the headgate entry. <br />5. Survey data over the 17-Right panel indicated the angle of draw to be approximately <br />17.0 degrees in the vicinity where the railroad track crossed the headgate entry. <br />First-half 2005 hydrologic monitoring did not indicate significant impacts to Fish Creek. <br />2005_1 stHaltSubReport.doc Page 3 of 3 <br />7/21/2005 <br />