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2016-08-08_GENERAL DOCUMENTS - C1981019
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2016-08-08_GENERAL DOCUMENTS - C1981019
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Last modified
8/24/2016 6:25:34 PM
Creation date
8/9/2016 8:42:50 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
General Documents
Doc Date
8/8/2016
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Tri-State Generation and Transmission
Permit Index Doc Type
Findings
Email Name
JRS
RDZ
Media Type
D
Archive
No
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<br /> <br /> <br /> <br />PR-04, Colowyo Coal Mine C1981-019 42 August 2016 <br /> <br />storage tanks, and used during the daily operation of the mine. It is anticipated that there will be <br />an excess of water produced at times, in which case up to 300gpm will be discharged to Collom <br />Gulch and the West Fork of Jubb Creek. <br /> <br />Two stipulations pertain directly to the dewatering of the pit: <br />STIPULATION 19: DEWATERING WELL PERMITS MUST BE IN PLACE, AND A <br />MINOR REVISION BE SUBMITTED AND APPROVED BY THE DIVISION TO UPDATE <br />SECTION 2.03.10 OF VOLUME 1 OF THE PERMIT APPLICATION PACKAGE, BEFORE <br />ANY DISTURBANCE ASSOCIATED WITH THE COLLOM PIT BOX CUT IS ALLOWED <br />TO OCCUR. <br /> <br />STIPULATION 20: A DISCHARGE PERMIT FOR WATER PUMPED FROM THE <br />DEWATERING WELLS MUST BE IN PLACE, AND A MINOR REVISION TO THE <br />PERMIT SUBMITTED AND APPROVED BY THE DIVISION TO UPDATE SECTION <br />2.03.10 OF VOLUME 1 OF THE PERMIT APPLICATION PACKAGE, BEFORE ANY <br />DISTURBANCE ASSOCIATED WITH THE COLLOM PIT BOX CUT IS ALLOWED TO <br />OCCUR. <br /> <br />Pit dewatering is expected to impact springs and seeps in an area bounded by the southern extent <br />of the pit, the West Fork of Jubb Creek to the east, Collom Creek to the west and an imaginary <br />line one to two miles north of the pit boundary. Springs and seeps are listed in Table 2.05.6-4 <br />and shown on Map 10B. Two of the mapped springs are expected to be eliminated and the flow <br />of several others is expected to be reduced, however the total flow of all the springs that have the <br />potential to be affected is not significant. The quality of water flowing from springs and seeps is <br />not expected to be impacted. A complete discussion is given in Volume 15, Rule 2, Section <br />2.05.6(3). <br /> <br />An approximate reduction of 50 percent of groundwater flow in the Little Collom Gulch <br />alluvium is expected during mining as a result of a reduction in the recharge area; this in turn is <br />expected to cause a 5 percent reduction of groundwater flow in the Collom Gulch alluvium. No <br />impact is expected to alluvial groundwater flow in the West Fork of Jubb Creek. These <br />predictions may be refined by the construction of MLC-04-02, and will be verified by data <br />collected at the five alluvial monitoring wells described above. The possible discharge of water <br />pumped to dewater the pit is not expected to contribute a significant amount to the total system <br />compared with the amount of alluvial groundwater in the system. <br /> <br />The Williams Fork formation is not a significant water supply source in the Danforth Hills, and <br />impacts to the quantity of groundwater in the formation are not expected to extend beyond those <br />discussed above. The Trout Creek Sandstone unit of the underlying Iles formation is a potentially <br />significant aquifer. The Division concurs with CCC’s assertion that no impacts are expected to <br />the quantity or quality of groundwater in the Trout Creek, as it is hydrologically isolated from
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