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PERMIT FILE - 11/17/2009, 11:31:17 AM-JWD
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PERMIT FILE - 11/17/2009, 11:31:17 AM-JWD
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Last modified
8/24/2016 11:28:22 PM
Creation date
11/17/2009 11:32:18 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
P2009026
IBM Index Class Name
PERMIT FILE
Doc Date
11/13/2009
Doc Name
Transmittal of Comment Letters
From
DRMS
To
Empress Gold Mining and Milling, Inc.
Email Name
ACS
Media Type
D
Archive
No
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IIUV uJ uo u - u fr I - - <br />Dust Control <br />Dust control is an ongoing concern for CDOT. This extends to visibility in adjacent areas. Dust control <br />is noted within the mill, but no mention is made of control for trucks tracking fine material off -site, or <br />wind blowing fines from either the ore stockpile or the 2,000 -ton tailings pile. Reduced visibility is a <br />safety concern for 1 -70 and for CDOT. <br />Water QualitI Impacts <br />Concerns regarding water quality impacts focus on the potential for contaminated waters crossing <br />CDOT ROW or destabilizing CDOT roadways. Several statements in the application raise concerns <br />about this potential, both during construction and milling processes. <br />• The applicant will need to ensure that the proposed concrete spillways will be constructed <br />without ca�ising Spills either onto adjacent land (C`T)1T /rminty RnW) nr intn Clear <br />Creek <br />• Hydraulic design of the settling and stormwater ponds for on -site pumping and drainage should <br />be adequate to manage major storm events without overtopping. The ponds noted in the August <br />submittal (Exhibit D) seem too small to prevent overtopping. <br />• There is no discussion of hydraulic isolation of the waste or tailings piles, to be located adjacent <br />to the mill building. Permanent erosion controls are necessary to keep this material from <br />mobilizing onto CDOT ROW. <br />• There is no "chemical-free" way to cause flotation of sulfides. If the additives for flotation end <br />up on CDOT ROW due to overflow, who cleans up the contamination? <br />• The settling ponds are anticipated to be left after the 20 - year mine life. Over that period of time, <br />through settling and evaporation of the ponds, a large amount of mineralized sediment is likely <br />to accumulate in the ponds. If the ponds are simply abandoned, the potential for toxic metals to <br />be washed onto CDOT ROW is high. <br />• Reclamation is anticipated to be minimal because "the entire operational area will be concrete <br />or asphalt." Does this mean that existing waste piles will be encased in concrete? If so, this will <br />greatly increase the area of rapid storm runoff. What permanent measures will be constructed to <br />ensure that the runoff will not cause erosion downhill of the site (i.e. erosion of CDOT ROW)? <br />Timing of Bridge Replacement <br />CDOT is in the final design phase of a project that will remove and replace the bridge between Idaho <br />Springs' Colorado Boulevard and the Stanley /Frontage Road just east of the Stanley Mine MS 4289. <br />Bridge removal is estimated to begin in September 2010 and take two months to complete. During this <br />time, the only way to cross Clear Creek will be by driving west to Dumont. The applicant will need to <br />include this in his scheduling of trucks. <br />CDOT neither supports nor opposes mining activities adjacent to our ROW. However, the above <br />concerns need to be addressed in order to minimize impacts to CDOT ROW and the 1 -70 transportation <br />corridor. We look forward to learning more about the applicant's plans and responses to these concerns. <br />Sin •erel Molly yck, Ph.D. <br />Environmental Project Manager -WQ <br />CDOT Region 1 <br />CC: Chuck Attardo, Jim Eussen, Russel Cox, Jay Kramer <br />
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