2023-06-06_PERMIT FILE - M2023015

• Permit No: M2023015
• IBM Index Class Name: Permit File
• Doc Date: 6/6/2023
• Doc Name: Application
• From: High Country Consulting Services LLC
• To: DRMS
• Email Name: ERR
• Email Name: MAC
• Email Name: AWA
• Media Type: D
• Archive: No

electronically to the Division within thirty (30) calendar days of receipt of the results. MineWater
shall continue the stream monitoring until closure of this Consent Order and Settlement
Agreement or until such time as the Division issues written notice modifying the monitoring
requirement or written notice that the monitoring may cease, whichever occurs sooner, but in no
event wilt MineWater's downstream monitoring requirements required by this Consent Order and
Settlement Agreement extend beyond September 30, 2018.
46. Within seven (7) calendar days of the effective date of this Consent Order and Settlement
Agreement, and until such a time that the Extension Tunnel Permit is terminated or revised,
MineWater shall install and maintain a clarifier at the Extension Tunnel Treatment Facility and
may begin using sutfide-based treatment reagents such as calcium polysulfide in the treatment
process to improve chemical contact time and the overall effectiveness of the treatment process.
Upon initiation of sulfide dosing, MineWater shall begin monthly grab sampling and analysis for
sulfate and sulfide at Extension Tunnel Outfall 001A. All sampling and analysis shall be performed
in accordance with methods specified in 40 C.F.R. Part 136, and at a minimum, shalt achieve a
sufficiently sensitive practical quantitation limit as outlined in the Division's Practical Quantitation
Limits (PQLs) policy (February 3, 2015). In addition to the effluent limitations and monitoring
frequencies specified in Part i.A.1. and Part 1.8.1. of the Extension Tunnel Permit, the discharge
at Extension Tunnel Outfatt 001A shall be monitored as specified below:
EXTENSION TUNNEL OUTFALL 001A
SULFATE AND SULFIDE DISCHARGE LIMITATIONS
Effluent Effluent Limitation Monitoring Requirements
Concentration
Parameter 30-day Average Frequency Sample Type
Sulfate, mg/ t Report Monthly Grab
Sulfide, mg/t Report Monthly Grab
MineWater shall summarize and report the results of its monitoring to the Division in a cover letter
attached with the monthly discharge monitoring reports ("DMRs") for the Extension Tunnel Permit.
If MineWater does not utilize a sulfide-based treatment reagent during the reporting period then
no analysis of sulfate or sulfide shalt be required.
47. MineWater shalt take all reasonable measures to obtain representative samples of the effluent
from the Water Tunnel and Extension Tunnel permitted outfall locations identified in the
respective Water Tunnel and Extension Tunnel permits. In the event that the outfall location is
not accessible for the duration of an entire monitoring period because of adverse weather
conditions, MineWater shalt provide evidence (e.g. photographs, pertinent regional weather data,
field notes, etc.) documenting that sampling of the discharge is not safe. This documentation shall
be provided to the Division along with the associated DMR for that reporting period.
48. Beginning September 30, 2016 and every calendar quarter thereafter, until such time as this
Consent Order and Settlement Agreement is closed or the Division decrees so in writing,
MineWater shall submit quarterly progress reports to the Division. At a minimum, each report
shall outline activities undertaken in the previous quarter and shall specify what activities will be
undertaken within the next quarter to achieve compliance with this Consent Order and Settlement
Agreement. If MineWater or THE has filed any applications to make any additional portion of the
London Mine Water Rights absolute, then the quarterly progress report shall notify the Division of
that fact and the status of such water court proceedings.
London Mine,LLC,et al. C O L O R A D O
Compliance Order an Consent and Settlement Agreement ��i o b e
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