20201025 Ver 2_Monitoring Report_20240131

q44 14
-4'�=-==' SIBELCO
Sibelco North America, Inc.
136 Crystal Drive • Spruce Pine, NC 28777
(PHONE) 828/765-1114 • (FAX) 828/765-4755
December 31, 2023
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Ms. Amanda Jones Fuemmeler
Asheville Regulatory Field Office
US Army Corps of Engineers
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
Subject: Stream Water Level and Precipitation Monitoring
Sibelco North America, Inc. — Brushy Creek Mine
Action ID SAW-2019-01042 & DWR #202001025
Ol is Waste Area Expansion
Spruce Pine, North Carolina, Avery County
Dear Ms. Fuemmeler:
Pursuant to United States Army Corps of Engineers Permit (Action ID: SAW-2019-01042)
issued December 15, 2021, and North Carolina Division of Water Resources Permit
DWQ#202001025 Ver 2 issued September 21, 2021, for the impact of a linear stream associated
with the expansion of Sibelco North America, Inc.'s 011is Plant Tailings Waste Area Expansion,
please find enclosed daily flow measurements and daily precipitation totals.
Special Condition P of the Army Corps Permit states "The pressure transducer will be
installed one year prior to the start of construction, monitoring will continue through two years
post -construction of the project. Baseline and Annual monitoring reports will be submitted to the
Corps that include a graph of water level and precipitation data."
In addition, the Division of Water Resources Permit Condition 3 requires annual monitoring
reports, including a graph of water level and precipitation data, be submitted to the DWR by
December 31 each year of monitoring.
A pressure transducer was installed in March of 2022 and data collection is ongoing. Please
find attached graph of this past year's daily flow measurements of the unnamed tributary
immediately downstream of the permitted project, prior to entering Brushy Creek. Additionally,
please find a graph of the daily precipitation data collected at a nearby on -site weather station less
than 1 mile away.
The project was recently completed and data will be collected for an additional two years.
The actual watershed was diverted into the constructed basins, bypassing this subject segment of

Ms. Amanda Jones Fuemmeler
Page 2
stream, near the first week of October. Since that time, the stream clearly remains with sufficient
flow due to localized springs in the area. There should be no concern with depletion of flow in this
segment of the stream due to the construction project.
Additional copies of these graphs are being sent to Division of Water Resources personnel
at both the Asheville Regional Office and the 301 & Buffer Permitting Branch. If you have any
questions regarding this matter or require further information, please do not hesitate to contact me
at [phone].
Sincerely,
X�Wll' �
Jeffrey S. Ferguson, P. E.
Sustainability Manager North America
SIBELCO NORTH AMERICA, INC.
Enclosure
c: Mr. Landon Davidson, DWR Regional Supervisor -ARC, 2090 U.S. Hwy. 70, Swannanoa, NC 28778
Mr. Paul Wojoski, Supervisor 401 & Buffer Permitting Branch, 1650 Mail Service Center, Raleigh, NC 27699-1650

1.000
0.900
0.800
0.700
0.600
a+
9.500
LL
0.400
0.300
0.200
0.100
0.000
Sibelco North America, Inc. - 011is Expansion Area
Unnamed Tributary Stream Water Level (ft)
January 1, 2023 - December 31, 2023
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.—I 00 .�i N N •--I .--I N � .N-I .�-I N •--I N M � .�-I N ci ci N e-I N N .-i .--I N •--I N N
Date
—Stream Level (ft)

3.00
2.00
1.00
0.00
Sibelco North America, Inc. - 011is Expansion Area
Precipitation Data - Onsite Weather Station
January 1, 2023 - December 31, 2023
C C C C C 4 4 4 i i T T T T T C C C C — — — — UO bD b0 Up b0 fl_ 0_ fl_ fl_ t ♦+ ♦+ ♦+ a+ > > > >
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cm -I 0N N � •--I � N '-1 W � N O1 N �N-I � N M � .^-I N M � N W ul N Ol tO
Date
—Precipitation (in)