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2013-02-01_REVISION - C1981041 (8)
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2013-02-01_REVISION - C1981041 (8)
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Last modified
8/24/2016 5:12:46 PM
Creation date
2/1/2013 2:32:16 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Revision
Doc Date
2/1/2013
Doc Name
Proposed Decision & Findings
From
DRMS
To
Snowcap Coal Company
Type & Sequence
RN6
Email Name
MPB
SB1
Media Type
D
Archive
No
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(4.24.3(1)). <br />2. As previously discussed, a portion of the non - exempt alluvial valley floor was historically flood <br />irrigated. In addition, a portion is subirrigated. The remaining area is potentially flood irrigable. <br />Surface waters which could be and were used to irrigate the non - exempted alluvial valley floor <br />would be diverted from the Highline Canal. Water in the Highline Canal is diverted from the <br />Colorado River approximately one mile upstream of the disturbance. The Highline Canal will not <br />be affected by subsidence or by mine discharges. Therefore, the quantity and quality of surface <br />water which supplies the AVF would not be affected by the proposed operations (4.24.3(3)). <br />Discharge from the Roadside and Cameo Mines will have a minor salt loading effect on the <br />Colorado River. The affect on the water quality from this discharge will be to increase the specific <br />conductance and total dissolved solids about 0.2 percent. This, in turn, would have a minor effect <br />on the water which supplies the subirrigated portion of the AVF, since recharge water from the <br />adjacent Colorado River is the source of alluvial groundwater which subirrigates the AVF. <br />During mining, the sediment control system will temporarily reduce surface flows and will remove <br />sediment loads. Sediment ponds will not remove dissolved solids. Thus, the mine operation will <br />increase salt loads. Reduction in flow will only occur during significant precipitation events and <br />possibly during spring snowmelt. During these events, flows will be reduced for only a period of <br />24 hours. Even then, the amount of water stored in the sediment ponds is minor compared to the <br />average flow of the Colorado River (3549 cfs). <br />All effects from the mining operation will be short- termed. With reclamation and removal of the <br />sediment control system, these effects would be mitigated. Based on the above discussion, the <br />Division finds that the proposed operations will not materially damage the quantity and quality of <br />water in the surface and underground water systems that supply the alluvial valley floor or portions <br />of the alluvial valley floor (4.24.3(3)). <br />The mining operations had already disturbed much of the alluvial valley floor within the permit <br />area prior to August 3, 1977, with construction of the overland conveyor and loadout facility. No <br />additional disturbance of this area is planned. The essential hydrologic functions of those areas <br />which will remain undisturbed will be preserved. <br />The permittee identified subirrigation and flood irrigation as the essential hydrologic functions of <br />the AVF. In the past, the Highline Canal, which is immediately upslope of the AVF, has been the <br />source of water for irrigating a portion of the AVF. As described below, no irrigation presently <br />takes place in the site area. <br />Subirrigation is controlled by the water level in the adjacent Colorado River and is not affected by <br />the reclamation plan. No actions are necessary to reestablish subirrigation. The reclamation <br />procedure will restore the essential hydrologic function of subirrigation. Quantity and quality of <br />water is largely regulated by the Colorado River. Any quality changes resulting from the surface <br />operations will be of short duration due to the close proximity of the Colorado River and the <br />extensive underflow associated with this relatively large surface water flow system. In addition, if <br />a groundwater problem is detected by the monitoring program, mitigation measures will be <br />undertaken prior to reclamation of the site. <br />53 <br />
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