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2013-10-29_GENERAL DOCUMENTS - C1981008
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2013-10-29_GENERAL DOCUMENTS - C1981008
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Last modified
8/24/2016 5:34:34 PM
Creation date
10/30/2013 8:03:03 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
General Documents
Doc Date
10/29/2013
Doc Name
Proposed Decision and Findings
From
DRMS
To
Tri-State Generation and Transmission Association, Inc
Type & Sequence
RN6
Permit Index Doc Type
Findings
Email Name
MLT
SB1
Media Type
D
Archive
No
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As is seen from this table in the permit, the spoil water inflows from both mine <br />areas influence the quality of Tuttle Draw to a minor degree. However, within <br />4500 feet, this flow enters the San Miguel River where the flow is so much larger <br />than the Tuttle Draw flow that the impact is negligible. During periods of <br />irrigation, Tuttle Draw is flowing at a higher rate while the River is running low, <br />which is the time of maximum impact of the flows. at this time, the increase in <br />TDS of the River is from 620 to 652 ppm, or an increase of 5.1 %. It should be <br />noted that Tuttle Draw flows are always higher in TDS than the River, regardless <br />of the spoil springs, therefore, the impact from the spoil springs may be only 2- <br />3% increase in TDS. During March/April, the River is flowing fast and Tuttle <br />Draw is at low flow, therefore the increase in TDS for the River is only 2 ppm, or <br />an increase of 0.4 %. Also, these impacts are for the time when the spoil material <br />is leaching salts at a maximum. As described earlier, the TDS levels will drop as <br />pyrite and salts are leached out of the spoil, lessening the impact to the waters <br />downstream even further. <br />Calamity Draw is not included in Table 2.05.6(3) -4 of the permit since the spoil <br />springs from both mine areas will not enter this stream. This intermittent stream <br />should not be affected in the long term by the mining and reclamation operation. <br />Overall, the effects of the spoil springs are not significant to the waters <br />downstream. All of the probable impacts have been determined to be of a short <br />term nature, of minimal significance, or a plan has been presented to mitigate <br />those determined to have some significance. As a result, mining and post mining <br />effects to current land uses should be negligible. <br />J. Water Rights <br />The water augmentation plan is found in Section 2.05.6(3) of the permit document. <br />Western Fuels - Colorado has acquired approval from the Colorado Water Court for <br />this augmentation plan and has a completed well permit for use of water from Pond <br />007. Demonstration for retention of Pond 007 is found in Attachment 2.05.3(3) -16 of <br />the permit. Attachment 2.05.3(3) -19 provides the demonstration for retention of Pond <br />008, which is located on property owned by Burbridge. <br />IV. Topsoil <br />Topsoil redistribution within the New Horizon Mine 1 permit area has been completed. <br />Replacement thicknesses varied from approximately 1.0 feet on dryland pastures to 1.5 feet <br />on irrigated pastures, depending upon the actual amount of topsoil recovered. Ion 2012, <br />Mine 1 was incorporated into the New Horizon North Mine permit area, and will likely be <br />removed from this permit at some future date. <br />For the New Horizon Mine 2 permit area, topsoiling operations have been completed for <br />areas east of 2700 Road, with the exception of haul roads and the support facilities area. <br />43 <br />
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