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<br />' Coal <br />Flows <br />Plots of the-measured discharges are presented on figure 12 and Figure <br />' 13. The flows from the No. 5 Mine and No. 9 Mine are measured at the <br />discharge end of their respective settling ponds. None of the flow <br />rates significantly exceeded the predicted values of 810 to 870 gpm for <br />' the No. 5 Mine and 200 to 320 for the No. 9 Mine. The 1983 average <br />discharge from the No. 5 Kline was 710 gpm and the average rate discharge <br />from the No. 9 I•tine was 110 gpm. During the period from the end of 14ay <br />to the beginning of September there was very little discharge from the <br />t No. 5 Mine because its new underground sump was fillino and the new mine <br />dewatering system was being installed and tested. <br />' Water Quality <br /> Summaries of the water quality data for the two mine discharges are <br /> presented on Table 14 to Table 18. The mine discharges are NFDES <br /> discharge points. The data indicates that the water quality of the <br />' discharges has been generally constant through time. The only parameter <br /> which seems to be varying significantly is zinc. The measured zinc <br />' values exceed standards occasionally. This parameter is being evaluated <br />by the Department of Health and may be increased in the coming months. <br /> This may be a natural phenomenon because samples from most of the <br /> aquifers and surface water sampling points also occasionally exceed the <br />' standards. <br /> Alluvium <br />t Sediments in two stream valleys are monitored: the Williams Fork <br /> Alluvium (6 wells) near the confluence with the Yampa River and the <br /> Yampa River Alluvium (wells,) in the Big Bottom area. Monitoring of <br />' the Williams Fork Alluvium was'reduced to 3 wells in September, 1983. <br /> Water Levels <br />' Ground water levels in the alluvium have remained fairly regular, with <br /> normal seasonal fluctuations apparently related to seasonal changes in <br /> river levels. Ground water levels in the alluvium are plotted on Figure <br />' 14 and Figure 15. Piezometric maps for December, 1983 are presented on <br /> Figure 16 and Figure 17. <br />' Water Quality <br />Summaries of the water quality data for the alluvial wells are presented <br />' on Table 19 to Table 23. Plots of electrical conductivity verses time <br />are presented on Figure 18 and Figure 19_ <br />There is no evidence of seasonal variation of water quality in either <br />' alluvium. Also, there is no evidence of long-term changes in the water <br />quality. <br /> <br />- 3- <br />