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_' <br />3. On page 91, the statement is made that there does not appear to be any <br />distinct trends in TDS values at Station FG1. There appears to be a <br />gradual trend toward a minimum value in 1983 followed by a gradual rise <br />in later years. The report states there is a general inverse <br />relationship between flow and TDS at all stations. It is suggested that <br />a regression equation be developed to quantify this relationship. A <br />similar equation, developed after mining commences, would be an <br />instructive measure of changes in 7DS, if any, due to mining. <br />4. In the discussion of springs on page 107, the report states that for the <br />Olson Springs (5-45), the concentration of sulfate does not meet CDH <br />Secondary Drinking Water Standards. Since no data has been reported on <br />Table 30 for sulfate it is difficult to verify the accuracy of this <br />statement. <br />5. Peabody Coal Company should, upon completion of all new hydrologic <br />monitoring sites, submit all pertinent completion information to the <br />Division for the purpose of updating monitoring site records. <br />If you have any questions or comments regarding these concerns, please contact <br />me. <br />Sincerely, <br />Steven G: Renner <br />Hydrologist <br />SGR/lal <br />cc: Michael Savage <br />1583E <br />