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. ,- <br /> <br />Mr. Marcus Middleton -4- July 29, 1993 <br />Twentymile Coal Company <br />downstream all continue to be influenced by mining activities. The most notable <br />influence is an increase in salinity due to mine water discharge and spoil springs. At <br />the present time, salinity increases due to mining appear to be within the approved <br />limits as outlined in the Probable Hydrologic Consequences section of the permit. <br />Further review of this topic will be conducted within the permit revision (PR-03) for the <br />Foidel Creek Mine and in conjunction with the AHR review for the Eckman Park Mine <br />(C-81-071). <br />Discharge and Pond Sites <br />1. All requirements were met. <br />Mine /nflow/Outflow <br />1. The "1992 Mean Flow, Irrigation Period" column from Table 30 does not seem to <br />correlate to the new data. For example, Station 8 reads .27 but data calculates .23; <br />Station 301 reads 14.8 yet data calculates 18.58. Please explain this discrepancy. <br />2. Combined underground mine discharge in 1992 was .42 cfs. This is 55 percent above <br />the historic average of .27 cfs. <br />Thank you for your continued efforts to adhere to your monitoring plan. <br />Sincerely, <br />/~~C~n <br />Kent A. Gorham <br />Reclamation Specialist <br />KAG/bjvv <br />cc: David Berry <br />m:\oss\bjw\kag <br />