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7. ANALYSIS OF POSTMINING TOPOGRAPHY PROJECTIONS <br />Requirement <br />In previous Annual Reports this requirement was incorporated <br />with the swell factor analysis. The swell factor analysis <br />will now be completed every two and one half years. <br />The analysis of the postmining topography will serve to verify <br />the accuracy of the postmining topography projections. <br />Monitoring for this purpose will remain the same as in the <br />past, utilizing accepted aerophotogrammetric methods. <br />Response <br />The 1992 Annual Report Mao, Exhibit 14, shows the mine <br />configuration and reclamation progress as of the October 1, <br />1992 aerial flight. <br />Two cross section (1-1' and 2-2') are submitted which <br />compare the actual versus the predicted postmining topography, <br />as well as the pre-mine topography and original box cut/F seam <br />contour line. These cross sections are submitted as Exhibits <br />16 and 17. These cross sections indicate that the difference <br />between the actual versus predicted postmining topography is <br />very slight and well within acceptable mining practice. <br />A swell factor analysis was completed and is provided by <br />the attached memorandum by Colowyo Engineer, J. D. McFarland. <br />The original requirement for swell factor analysis was <br />established in 1982 as part of the initial permit approval. <br />Colowyo has since monitored the swell factor analysis for a <br />decade. The original monitoring requirement provided that <br />Colowyo would continue the monitoring procedures until the <br />Division determined that the results were sufficient to <br />• adequately verify overburden swell factor projections. L4e <br />17 <br />