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A4ountain Coa! Company 1997 Annual Hydrology Report {Vest E/k Mine <br />then be checked by MCC once the lab data aze obtained. MCC will then know immediately if a <br />• parameter has been missed and request that the lab perform that analysis or, if holding times <br />have expired, resample the resource. The data will then be entered into the water resources <br />database and checked for accuracy. This process will ensure that MCC continues to collect the <br />data required by the monitoring program and reduce the number of missed parameters. <br />Operations <br />With the encotmter of inflows from the B East Mains fault in WY96 and the 14 SEHG fault in <br />WY97, the management of mine water has become more complex. In response, MCC has <br />installed additional pipelines and flow meters and is upgrading their mine water treatment <br />processes. In addition, as approved in Minor Revision No. 208, MCC will begin sampling and <br />reporting in the AHR more detail on mine inflows. Flow measurements, field pazameters, and <br />water quality samples will be taken as close to the inflow source as feasible for flows that aze <br />greater than 5 gpm and/or last longer than 7 days. If the inflow is continuous, an initial sample <br />will be obtained, and then sampled at least annually thereafter. These additional measures will <br />provide additional information on the mine water balance and reduce the probability of adverse <br />impact to the North Fork. <br />Conclusion <br />On the basis of the recent changes and anticipated future changes to the monitoring program, <br />WWE concludes that the hydrologic monitoring program with are adequate to establish the <br />• extent to which mining activities are impacting water resources in the area. <br />D.\831-032WSOjmk\1997 AHR\1997 AHR.doc <br />• <br />83 - 2.450 Page rig t arer ngineers <br />