2023-05-25_PERMIT FILE - M2022048 ‎(18)‎

• Permit No: M2022048
• IBM Index Class Name: Permit File
• Doc Date: 5/25/2023
• Doc Name Note: Review Assistance Document
• Doc Name: Adequacy Review Response
• From: Environment Inc/LG Everist Inc
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Exhibit G Water Information (cont)
level measured prior to installation of the slurry wall liner.
This drain may be in the form of a ditch or a buried perforated
pipe as described in the GWM. DRMS shall be notified within two
business days of the complaint and the proposed initial steps for
the evaluation of the complaint . A written report will be
submitted to DRMS within 30 days detailing the information
collected during the investigation of the complaint, and proposed
mitigation activity, if required.
Post Reclamation
Any slight groundwater mounding and shadowing associated with
the slurry wall sealed portions of the pit are not anticipated to
produce any adverse impacts to adjacent properties . Potential
groundwater mounding around the mine will be mitigated by the
South Platte River, road corridor and the irrigation
return flow ditches surrounding the lined area. These existing
water features will serve to regulate and balance groundwater
elevations in the alluvium adjacent to the sealed pits . The GWM
suggests that once the groundwater reaches the maximum predicted
levels it will stabilize and the corridors left through and
around the liners will allow water to pass around the liners .
The operator does not anticipate any long-term post-
reclamation ground water depletions, but if there are any, they
would be replaced through a Colorado Water Court approved Plan of
Augmentation.
L.G. Everist, Inc . expects that prior to competition of the
reservoirs a local government agency will purchase the storage
rights and may begin final construction on the reservoirs . As
water storage reservoirs are completed, they will be turned over
to the purchaser for further development to complete the final
features needed for developed water storage reservoirs . L.G.
Everist will submit Technical Revisions to the DRMS if the
purchaser makes changes prior to L.G. Everist receiving final
reclamation approval and acreage releases from the Division.
Water Quality
The attached report prepared by Molen Associates explains
the plan for collecting the necessary background water quality
information of the permit area. Included is a list of the
chemicals to be tested for and their frequency. This plan
includes installing 6-7 additional monitoring wells around the
mine and use 4 existing wells that lay outside the proposed
slurry walls to collect the data needed for 5 quarters prior to
mining and yearly testing as needed. once the 5 quarter samples
are collected and analyzed a Technical Revision may be filed to
reduce the required monitoring list for the life of the mine .
Discharge Permits Surface Water Management
When necessary, ground water will be pumped and discharged
from the West Farm Reservoirs mine under a CDPS Permit which the
operator will obtain from the Colorado Department of Public
Health and Environment, Water Quality Control Division (CDPHE-
WQCD) . This permit will remain active during the life of the
mine . The discharge points may change as mining progresses and
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