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GENERAL33175
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Last modified
8/24/2016 7:55:18 PM
Creation date
11/23/2007 7:32:48 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
General Documents
Doc Date
10/23/2000
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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Runoff Water Quality. High quality snowmelt runoff contains fairly ]ow levels of total <br />dissolved solids ('CDS). Therefore, concentrations of TDS decrease during peak flow periods, in <br />the summer, when ground water discharge makes up a largec percentage of the flow in the rivers, <br />TDS values increase. The Colorado Water Conservation Board (1969) reports that intermittent <br />(and ephemeral) drainages at lower elevations contribute most of the dissolved and suspended <br />solids that leave the basin. <br />Water Quality in lt'ampa and Williams Fork Rivers. The dominant cations in the Yampa and <br />Williams Fork Rivers are calcium, sodium, and magnesium. Dominant anions are bicarbonate <br />and sulfate with minor chloride. The concenvation of total dissolved solids (TDS} averages <br />around 270 mg/1 in the Yampa River immediately below its confluence with the Williams Fork <br />River. The Williams Fork increases the Yampa River's TDS concentration by less than 20 mg/1. <br />The concentration i.n the Williams Fork averages around 300 mg/1. <br />Use of Yampa RivEā¢r Water. Water within the Yampa River Basin is consumed through the <br />irrigation of croplands, municipal water supplies, stock watering, cooling water for power plants, <br />evapotranspiration by ripazian vegetation and phreatophytes, and transbasin diversions. Irrigation <br />of cropland constitutes the largest of these uses. Surface water consumed within the Yampa <br />River drainage basin in 1976 totaled approximately 445,000 acre-feet. Of that, 399,000 acre-feet <br />were used for irrigating croplands and hay meadows or for watering livestock. Other uses <br />included 5,478 acre-feet for industrial purposes, 2,555 acre-feet for municipal water supplies, and <br />8,283 acre-feet for other unspecified uses (Steele et al., 1979). Industrial consumption has since <br />increased by a total of 18,720 acre-feet per year due to use by the Ctaig generating station. <br />Irrigation Use of Surface Water. Water for agricultural irrigation is generally obtained by <br />simple stream diversion structures and networks of ditches for flooding grasslands and meadows <br />during summer months. The short growing season precludes growing of warm weather crops <br />such as com. In the Williams Fork River, an even higher proportion of the water used is for <br />irrigation of grasslands and hay fields. <br />Aquifer Straligraphy. Within the general vicinity of the Eagle Mines, ground water exists in <br />both bedrock and alluvial aquifers. Significant bedrock aquifers are (listed in ascending <br />stratigraphic order) the Trout Creek, Middle, Twentymile, and White sandstones. The Middle, <br />Twentymile and White sandstones are in the Williams Fork Formation; the Trout Creek <br />sandstone is the uppermost member of the underlying Des Formation. The main alluvial aquifers <br />in the area aze associated with the Yampa and Williams Fork Rivers. The alluvial aquifers <br />probably contribute to baseflow of the rivers during dry periods. Coal seams, discontinuous <br />sandstones, and siltstones and smaller alluvial bodies in the area of the mine are also water- <br />bearing. but contain insufficient quantities of water to be considered significant aquifers. <br />Ground Water Use. "the Trout Creek Sandstone, the Twentymile Sandstone, and the White <br />Sandstone are bedrock aquifers currently being used for ground water supplies in the general <br />vicinity of the Eagle Mines. The Middle Sandstone is not currently used as a ground water <br />supply in the vicinity. The alluvial bodies associated with the Yampa River and Williams Fork <br />River contain limited ground water and are not considered major aquifers in the general area. <br />Alluvial bodies along the Yampa River up- and downstream of the general area, however, are <br />significant sources of ground water. High yield irrigation and municipal water supply wells are <br />8 <br />
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