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Ms. Christine Johnston <br />Mountain Coal Company <br />Page 13 <br />August 23, 1996 <br />maximum baseline values have been established as total concentrations. For <br />the analyses presented in Table H-1 of the 1994 AHR, some of the metals <br />analyses were done as total metals and some of the analyses were done as <br />dissolved metals. Consistent use of total versus dissolved analyses is necessary <br />to make useful comparisons in the future. The Division recommends <br />consistent use of both total and dissolved metals analyses for Fe and Mn for <br />future sampling efforts. <br />22. On page 22, it states that "no apparent changes in the water quality of the <br />North Fork of the Gunnison River are attributed to affects of mining during <br />WY 1994". This cannot be fully assessed without all of the required <br />monitoring data being submitted (see comment no. 5 for 1994 AHR above). <br />The data presented in Table E-1 shows a significant increase in iron between <br />the North Fork Gunnison Upper station (6.96 mg/I on 04/18/94) versus the <br />North Fork Gunnison Lower station (l9 mg/I on 04/18/94). However, the <br />value for the North Fork Gunnison Lower station (19 mg/I) conflicts with the <br />same data presented for this sample date in Appendix D, Table D-1. Please <br />verify this sample concentration and provide revised report page(s). <br />23. For consistency, in future AHRs please provide a brief interpretation of the <br />discharge from all site ponds (see page 25 under Runoff from Disturbed <br />Area). <br />If you have any questions concerning the Division's review of the 1993 and 1994 AHRs, do <br />not hesitate to contact me. Please provide responses to the above comments by September <br />30, 1996. <br />Sincerely, <br />1U1 u/~u0 D Q~~ <br />Michael P. Boulay <br />Environmental Protection Specialist <br />MPB/bjw <br />