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2011-09-16_REVISION - M1990057 (9)
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2011-09-16_REVISION - M1990057 (9)
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Last modified
6/16/2021 6:12:53 PM
Creation date
9/20/2011 7:42:45 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1990057
IBM Index Class Name
REVISION
Doc Date
9/16/2011
Doc Name
Adequacy Review
From
The Union Milling Company
To
DRMS
Type & Sequence
TR3
Email Name
MAC
Media Type
D
Archive
No
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CDRMS question <br />14. As required by Rule 7.3.2(2), please commit to providing the Division with certified verification <br />by a professional engineer or other appropriately qualified professional that will confirm that <br />facility was constructed in accordance with the approved design plan. <br />UMC Response <br />UMC has retained an Owner's Engineer, who is a Registered Professional Engineer and a Professional <br />Land Surveyor in the State of Colorado, to monitor the contractors. Additionally, as- constructed <br />drawings will be provided and certified, by the same Owner's Engineer, that that the facility was <br />constructed in accordance with the approved design plan. <br />CDRMS question <br />15. The current Reclamation Plan states no final slopes will be steeper than 4H:1 V. However, the <br />outslopes of the TSF will be reclaimed to 2.5H:1 V. Please clarify if the final slopes of the TSF <br />will remain at 2.5:1 V. If so, then revise the Reclamation Plan accordingly. <br />UMC Response <br />The Phase 1 TSF facility will have reclaimed slopes of 2.5H:1 V. The Reclamation Plan will be revised to <br />reflect this statement. <br />CDRMS question <br />16. As required by Rule 6.2.1(2), all maps must be prepared and signed by a registered land <br />surveyor, professional engineer, or other qualified person. In addition, outline and label the <br />permit boundaries which correspond to the legal description; the Division considers the area <br />bounded by the permit boundary to be analogous to the affected area. Please revise Exhibit TSF - <br />01 accordingly. <br />UMC Response <br />UMC is resubmitting TSF -01, TSF -02, TSF -03, TSF -04 and has added an additional Exhibit TSF -05. <br />These exhibits are signed by a Colorado Registered Professional Engineer. J. Michael Elder, No. 15803, <br />is licensed through December 31, 2012. <br />The Exhibits show a red dashed line, marked disturbed area in the legend. This red dashed line is the <br />permit boundary and the affected area boundary. The permit boundary and the affected area boundary are <br />exactly the same areas. <br />CDRMS question <br />17. To establish the amount of the required bond, it must be assumed that at the time of bond <br />forfeiture, fluids will have filled the tailing impoundment to capacity, and that the fluids cannot <br />be released into the environment. Please provide a plan and estimated cost for disposing of the <br />uids. <br />UMC Response <br />UMC envisions no scenario where the above assumption for a completely fluid filled impoundment to be <br />true. In the event of an immediate cessation of operations, approximately 350st of water would be in <br />circuit and an equivalent amount of water in the decant portion of the impoundment. A 2ft depth of water <br />would occupy an area approximately 100ft x 100 feet. Only storm water would additionally contribute to <br />the water level in the impoundment, and in UMC's experience and based upon visual observations of the <br />existing TSF impoundment constructed 20yrs ago, the evaporation rate far exceeds the storm inflow rate. <br />UMC's opinion is that other than in the spring melt, there will be no water in the impoundment within <br />M1990 -057 September 16, 2011 <br />
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