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REP35727
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REP35727
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Last modified
8/25/2016 12:13:07 AM
Creation date
11/27/2007 7:12:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Report
Doc Date
4/8/1987
Doc Name
1986 AHR: Text and Figures
Permit Index Doc Type
HYDROLOGY REPORT 1986
Media Type
D
Archive
No
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<br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br />high levels during that period. <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 above normal in late <br />1983 and early 1984. The laboratory measurements did not show the same <br />SURFACE WATER MONITORING <br />There are two rivers in the vicinity of the Empire Energy mine site. The <br />major river, the Yampa, flaws in a southeasterly direction across the mine <br />site. The Yampa River drains mast of the northeast corner of Colorado and <br />part of south-central Wyoming. The second river is the Williams Fork <br />which is a major tributary of the Yampa River. The Williams Fork River <br />joins the Yampa River on the mine property. Data is collected for the <br />Williams fork River. In addition, data is collected from three springs: <br />1) the No. 1 Strip Pit (NPDES site), 2) Haxton Springs, and 3) North <br />Spring. <br />RIVERS <br />River Flaw <br />The Williams Fork River flow data is collected by the U.S. Geologic Survey <br />at one continuous gaging station and one staff gage. The Williams Fork <br />River continuous gaging station is near the confluence with the Yampa <br />River. <br />A summary of the staff gage readings for 1986 is presented in Table 27. A <br />plot of daily mean flow versus time fur the Williams Fork River for 1986 <br />is presented in Figure 28. The plot far the Williams Fork River includes <br />the mean monthly flows for the Williams Fork at Hamilton (a discontinued <br />U.S.G.S. gaging station). For the Williams Fork River, the maximum mean <br />daily flow was 1,540 cfs, the minimum mean daily flow was 49 cfs and the <br />mean flow was 297 cfs. The flows in the Williams Fork River, were on the <br />average, lower in 1986 than the previous two (2) years. <br />The flows in the Williams Fork measured to date by Empire Energy do not <br />show any significant variation from expected values. <br />River Water Quality <br />Summaries of the water quality data are presented in Tables 28 through 31. <br />A plot of upstream and downstream field electrical conductivity <br />measurements for the river is presented in Figure 29. The data indicates <br />that the surface water quality does not show any significant variation <br />from expected values. The data from the upstream and downstream station <br />on the Williams Fork River indicate that there is no detectable effect of <br />mining on river water quality. As expected, conductivity decreases with <br />increasing flow rate in the rivers. This is due to the effects of snow <br />melt and high rainfall diluting the water. <br />1 <br />
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