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TCC apologizes for the inconvenience that this has caused, and plans to modify the procedure <br />used in developing Table 30 to more readily identify and correct potential errors in subsequent <br />report generations. <br />DMG Concern <br />2. Combined underground mine discharge in 1992 was .42 cfs. This is 55 percent above <br />the historic average of .27 cfs. <br />TCC Response <br />While the inflow to the mine has increased from previous levels and compares to the historic <br />average discharge rate as described, the rate of inflow is still within the projected levels put <br />forth in the permit when taking the lack of major inflow points along the fault into account. <br />As discussed in the permit, the rate of inflow to the mine is expected to increase over time <br />as larger areas are opened to dewatering effects, until such time as an equilibrium point is <br />reached. <br />Please note that, as described in the TCC 1992 AHR document pages 14 and 15, the <br />interception of a fracture area during October 1991 in the portal extension resulted in higher <br />inflow rates to both the 109 and 115 discharge zones. Please also note that the discharge <br />rate for 1992 was only some 10-15% higher than the previously observed maximum <br />discharge rate of 0.37 cfs in 1988, as shown on Table 30. Again, these values compare <br />favorably with the predicted inflow rates outlined in the TCC permit when one factors in the <br />lack of major inflow points along the fault. <br />Should you have any questions or comments, please contact me at your convenience. <br />Sincerely, <br />~~~~~~~~ <br />Marcus A. Middleton <br />Environmental Specialist <br />