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4. The data presented in Figures 81 and 88 for surface water monitoring stations B-Gulch-Io and C- <br />Gulch-lo respectively have relatively high values for conductivity and certain constituents such as <br />iron, sodium, sulfate and calcium. Is the Division correct in assuming that these samples were <br />obtained from washdown water from the mine facilities before flowing into sediment ponds B and <br />C, rather than from a precipitation event? <br />2004 Annual Mine Inflow Report <br />The Division has no questions concerning this report. The mine water inflow decreased from 25 gpm down <br />to 15 gpm as mining moved from the D-seam to the B-seam. <br />The consumptive water use for 2004 was 212.7 acre-feet, slightly above the 2l 1.85 acre-feet for 2003 but <br />well below the predicted value of 326.6 acre-feet stated in the permit application. The water usage rate at <br />the mine for 2004 averaged 45.4 acre-feet per one million tons of mined coal, up slightly from the rate of <br />44.2 acre-feet for 2003. <br />2004 Bi-Annual Subsidence Reports <br />As noted in the report, the visual monitoring program did not reveal any new or rejuvenated landslide <br />activity due to subsidence. Also, the survey data did not reveal any unexpected subsidence magnitudes. <br />The Division has only the following issue concerning this report. <br />5. On Map 27B, "Subsidence Features" of the Annual Report, there are cross-hatched black and <br />white areas with a "no cracks" notation followed by a date. Is the Division correct in assuming that <br />this refers to areas that showed subsidence cracks in 2004 but which eventually healed by the <br />listed date? Also, the Division requests that a note be added to Map 27B for future Annual Reports <br />that clarifies the meaning of this designation. <br />If you have any questions, please call me. <br />Sincerely, <br />r) <br />J sep J. Dddash <br />nvironmental Protection Specialist <br />cc: Jim Stover P.E. (J.E. Stover & Associates) <br />c:\word\bowie2\2004annrptadegl <br />