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Pir. Gregg Squire -2- January 10, 1985 <br />• in the drain (see photos 3 6 4). Pit run gravel averaging two <br />inches in size was placed in the filter drain (see photo 5) and <br />the ends of the fabric were overlapped Ln accordance with the <br />plan (see Exhibit 1). <br />• <br />C~ <br />Blasted sandstone from within the pit was end-dumped in six foot <br />lifts. The sandstone was then run over and reduced by dozers <br />to make access for subsequent lifts. This process resulted in <br />final lift heights of approximately four feet (see photos 6 6 7). <br />A total of three lifts were done in this fashion to provide 12 <br />feet of blasted sandstone with an average particle size of approxi- <br />mately 8 inches, thus completing the filter drain. Exhibit 1 <br />shows the as-built filter drain in plan, profile and cross section <br />view. <br />I certify, based upon my field observations and review of the <br />design approved as part of Permit C-054-82 for the Carbon Junction <br />Mine, that the fill underdrain system was constructed In compliance <br />with the approved design dated April 17, 1984. <br />Terry D. <br />Colorado <br />TDB/jca <br />Enclosures <br />cc: Hr. Jim Hendricks, Pueblo Coal, Inc. (2) <br />~~?1 S 4 5~3 <br />