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,, <br />~" ~ ~II ~I~~I~II~'~~~~I~ <br />DEPARTMENT OF NATURAL RESOURCES <br />Dantl H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richard D. Lamm <br />Governor <br />DATE: June 5, 1986 <br />T0: Gregg Squire <br />FROM: Candy Thompson <br />RE: Trapper Mining TR for Ground Water Monitoring Reduction <br />I have reviewed Trapper's proposal to remove wells GZ1, 2 and 3 and GF7, 8, 9, <br />10, 12 and 13. <br />The GF wells, as stated in the revision request, were originally required for <br />installation due to proposed ash disposal in the D and E pits. These pits <br />have never been used for such disposal; therefore, the requirement to install <br />them can be deleted. Wells GF-11 and GD-3 are still required for installation <br />and will monitor spoil water characteristics in the E and D pits respectively. <br />The GZ wells are the most upgradient bedrock wells at Trapper. They will be <br />mined through. GZ-1 was installed in the Twentymile Sandstone but has been <br />dry since installation. Two other wells, GD-1 and GF-1 currently monitor this <br />aquifer. Twentymile lies approximately 100 feet below the lowest mined <br />complex of Q-R. GZ-2 is installed in the U Seam which is also monitored <br />downgradient at GF-2. GZ-3 is in the Q-R complex which is monitored <br />downgradient by the GA-1, GE-1, GD-2 and GF-G. The location of the GZ wells <br />makes comparable placement of replacement wells impossible due to the <br />projection to mine through the entire hill slope by the D and E pits. This <br />fact along with the location of other monitoring wells downgradient make <br />approval to remove these wells without replacement appropriate. <br />In summary, I recommend we approve the TR as received. <br />0929E/cj <br />423 Centennial Building, 7313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />