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2022-04-04_PERMIT FILE - M2022013 (21)
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2022-04-04_PERMIT FILE - M2022013 (21)
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Last modified
4/5/2022 8:40:20 AM
Creation date
4/4/2022 4:42:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2022013
IBM Index Class Name
Permit File
Doc Date
4/4/2022
Doc Name Note
Exhibit G - Dewatering Evaluation
Doc Name
Application
From
Varra Companies, Inc.
To
DRMS
Email Name
RDZ
MAC
Media Type
D
Archive
No
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Dewatering Evaluation Report <br /> Varra Pit 124 <br /> Weld County,Colorado <br /> Page 5 <br /> the worst case scenario and a substantial amount of time will be required before maximum <br /> drawdowns will occur. <br /> In the author's opinion one cannot reasonably differentiate the head differences of seasonal <br /> groundwater fluctuations and head differences possibly created by lining mined pits — they are <br /> both within expected seasonal head variations. The permeability of the aquifer materials are <br /> sufficient to mitigate pressure gradients created by the impermeable liners. This mine is bounded <br /> on three sides by rivers and the surface water gains and losses to and from the aquifer will mask <br /> any possible hydrology changes created by pit lining. <br /> If there are unregistered domestic wells located within the area influenced by pumping, it may be <br /> advisable to conduct a physical well survey prior to the mine start-up. Though there is sufficient <br /> aquifer thickness to provide good well yields in most areas there may be partially penetrating <br /> wells that might be affected by mine dewatering. <br /> This report was prepared by AWES, LLC <br /> Date: 07/28/2020 <br /> Joby L. Adams, P.G. <br /> Principal/Hydrogeologist <br />
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