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2022-08-11_REVISION - M1994117
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2022-08-11_REVISION - M1994117
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Last modified
8/15/2022 8:33:16 PM
Creation date
8/15/2022 7:45:54 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1994117
IBM Index Class Name
Revision
Doc Date
8/11/2022
Doc Name
Request for Technical Revision
From
Colorado Milling Company, LLC
To
DRMS
Type & Sequence
TR11
Email Name
JPL
JLE
AWA
Media Type
D
Archive
No
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the surface for seepage when the water pressure is 57' of head or greater. This level of head <br /> corresponds to roughly 8405' in elevation. <br /> A monitoring zone based on Schnabel's recommendation is identified on the attached Bulkhead <br /> Location Map. Upon installation of this bulkhead, CIVIC personnel will visually monitor the <br /> ground surface along this zone for signs of seepage. The zone runs roughly 500' either side of <br /> the bulkhead along the hillside face. Monitoring will take place on a weekly basis following <br /> bulkhead installation for 90 days. If no seeps are identified in that time frame, monitoring will <br /> reduce to quarterly inspections. Particular attention will be paid to the portions of the monitoring <br /> zone running through Sunshine Canyon Road. <br /> No workings extend from the bulkhead out along the seepage monitoring zone; all <br /> Times/Wynona Mine workings extend back from the bulkhead in an easterly direction. Most vein <br /> structures identified are parallel to Sunshine Canyon road, reducing the pathways that might <br /> carry stored water towards the road. <br /> Once the bulkhead is built an as-built will be provided to CDRMS in a follow up technical <br /> revision. Please contact me with any questions. <br /> Regards, <br /> Ben Langenfeld, P.E. <br /> Lewicki &Associates, PLLC <br /> (720) 842-5321, ex. 1 <br /> benl(d-)_lewicki.biz <br /> GHM Q1 2022 <br /> July 2022 3 Lewicki&Associates <br />
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