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1 <br /> <br /> COAL <br /> <br /> Flows <br />' Plots of the measured discharges are for No. 5 Mine presented on Figure 18 <br /> and Figure 19. The discharge from the No. 9 Mine is presented on Table <br /> 37. The flows from the No. 5 and No. 9 Mines are measured at the <br />' discharge end of their respective settling ponds. The flow from the No. 5 <br /> Mine is also measured by a totalizing flow meters on the dewateriny sump <br /> pumps. The flow meter readings for the No. 5 Mine discharge were probably <br /> inaccurate in the fourth quarter and were not used in any calculations. <br /> The measured discharge from the mine ponds reflects the intermittent <br /> pumping of the mine. Monitoring of the flow from the No. 9 Mine ceased in <br />1 the 2nd Quarter, 1985 when the mine was shutdown and the mine allowed to <br />flood. None of the flow rates significantly exceeded the predicted values <br /> of_200-to 330._gpm for. the No. 9 Mine and 760 to 890 for the No. 5 Mine. <br /> The 1985 average discharge from the No. 5 Mine was 680 gpm from the sump <br />1 and the pond and the average discharge from the No. 9 Mine was 180 gpm. <br /> Water Quality <br />' Summaries of the water quality data for the two mine discharges are <br /> presented on Table 13 to Table 16. The mine discharges are NPDES <br /> discharge points. The data indicates that the water quality of the <br />' discharges has been generally constant through time. <br />I ALLUVIUM <br /> Sediments in two stream valleys are monitored: the Williams Fork River <br /> Alluvium (3 wells) near the confluence with the Yampa River and the Yampa <br /> River Alluvium (5 wells) in the Big Bottom area. Monitoring of the. Yampa--.. <br />1 River Alluv_iu <br />m <br />Wells ceased in October, 1985 due to the closure of the No. <br /> _ <br />_ <br />9 Mine. <br />' Water Levels <br /> Ground water levels in the alluvium have remained fairly regular, with <br />1 normal seasonal fluctuations apparently related to changes in river <br /> levels. Ground water levels in the alluvium are plotted on Figure 20 and <br /> Figure 21. A piezometric map for the Williams Fork Alluvium (Dec:ember <br />' 1985) is presented on Figure 22. <br /> Water Quality <br />' <br /> Summaries of the water quality data for the alluvial wells are presented <br /> on Table 17 to Table 18. Plots of field electrical conductivity verses <br />' time are presented on Figure 23 and Figure 24. <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. The field conductivity of Well AVF-5 was below the long term <br /> <br />' -3- <br />