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.~ r above mentioned pump malfunction. GENERAL COMMENTS 1) Although the water Level charts provided for each well and mine discharge point are useful, the data for• each event are needed in order to determine if water Ievel,s were measured according to the schedule outlined in the monitoring plan and to facilitate calculations of water level fluctuations. We should request that the operator provide water Level data in future submittals of AHR reports as well as ps-ovide the water level data for all previous years of the permit. 2) Some of the water level charts include data points that are off the scale of the chart. We may wish to request that the operator include all data points on the water Level charts. 3) The wells used to monitor the Trout Creek Sandstone are apparently both pumping wells. The practice of monitoring water Levels in pumping wells is questionab.e, because the water level around the outside of the pumping well is more representative of the cone of depression around the well and may bias an interpretation of the potentiometric surface and ground water flow direction. In addition, 'the water level measured in the well will be much lower than the head in the surrounding aquifer, even in the cone of depression, as a result of frictional losses. Therefore, we need to clarify with the operator whether the pumps were turned off and water levels allowed to equilibrate before water level measurements were taken. If not, the water level data from these wells are of questionable validity in the interpretation of the flow regime and dewatering trends in the aquifer.. However, for practical considerations, it may not be possible to suspend pumping in these two wells. 4) The water quality data for bedrock wells appears to be incomplete. The ground water monitoring plan in the permit calls for a hydroxide analysis which was pfarformed on the alluvial samples but not on the bedrock aquifers. We should ask the operator why the hydroxide analysis was omitted from the bedrock samples. 5) On Figure 14, there are no data to support th.e 6250' contour or the right flank of the 6150' contour. I.n addition, the placement of the 6200' contour appears to be slightly out of proportion with regard to the data points. On Figure 23, there are no data to support the 6122' contour. Although these errors probably do not change the overall flow picture presented on the maps, we may wish to caution the operator to base maps prepared in future AHRs strictly on the data available, so that it doesn't become an issue in the future.