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J. J. Dudash <br />April 19, 2005 <br />holes monitor the water in the D-Seam. Bowie has two other wells that <br />monitor water in the D-Seam. They are DH-15 and DH-67D. <br />There was only adequate water in AW-2 to obtain field parameters. There <br />was not enough water volume for a laboratory sample. <br />The quality of water in DH-49 has shown a continual increase in <br />conductivity since 1998. Bowie does not believe this change in <br />conductivity is indicative of contamination of the overlying small perched <br />aquifer. A review of the spring monitoring shows a similar trend. Bowie <br />believes the increase in conductivity is caused by the lingering drought. <br />Water is in contact with the surrounding formation for a longer period of <br />time so it has time to dissolve additional minerals thus increasing its <br />conductivity. <br />A completion diagram for DH-58 is enclosed. <br />The DMG notes a large increase for well DH-58, on the order of 24 times, <br />in the carbonate concentration in 2003. This drill hole was likely affected <br />by mine subsidence with the completion of the D6 panel during October <br />2002. However, a failure of the cement seal should not result in an <br />increase in the carbonate concentration. I do not have an explanation for <br />the increase in carbonate concentration. <br />10. Terror Creek monitoring well TC-03-01, figure 149, is completed in the <br />upper B-Seam. Terror Creek monitoring well TC-03-02, figure 151, is <br />completed in the sandstone formation immediately above the upper B- <br />Seam. It is likely the two wells are monitoring the same water but in a <br />different location. I believe the water analyses are accurate and the results <br />are not influenced by a failure of the cement seal. <br />If you have any questions, please contact me. <br />Sincerely, <br />ll ~=~~ <br />J. E. Stover, P.E. <br />Consulting Engineer <br />Enclosures <br />cc: U. S. Forest Service <br />Bureau of Land Management <br />