20120632 Ver 1_Monitoring Report_20171017

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unimin
433 ' Environmental Affairs
Unimin Corporation
136 Crystal Drive • Spruce Pine, NC 28777
(PHONE) 828/765-1114. (FAX) 828/765-4755
OCT 1 9 2017
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October 17. 2017
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Landon Davidson, P.G.
NCDEQ - Division of Water Resources
Water Quality Regional Operations Section
Regional Supervisor - Asheville Regional Office
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
Subject: Stream Temperature Data & Photographic Monitoring
Unhnin Corporation — Schoolhouse Facility
DWQ Project #20120632 West School House Mine
Spruce Pine, North Carolina, Avery County
Dear Mr. Davidson:
Pursuant to DWQ#20120632 issued October 30, 2012 for the impact of a linear stream
associated with the expansion of the West Schoolhouse Mine, Condition 12 "Temperature"
requires annual reports of the temperature data to be submitted to the Asheville Regional Office
on November 1 of each year. This project was recently constructed and completed in September
of 2016. Please find attached graph of this past year's daily temperature readings of the
unnamed tributary downstream of the permitted project, prior to entering Brushy Creek.
Additionally, Condition 11 "Flow" requires photographic monitoring to continue
throughout the project during the months of June, July and August. Although the project was
completed just over a year, I have included photographic monitoring for May -Sept of 2017. The
month of August could not be located and was possibly lost while personnel had transferred data
to anew cell phone. The pits attached shows this stream continues to provide aquatic life
propagation and biological integrity and will continue to do so.
As you will note from the attached temperature graph, the temperature in the unnamed
downstream tributary exceeded 68 degrees F for less than 50 days during the summer months.
Data from 2016 revealed a majority of the summer, close to 70 days total exceeded 68 degrees,
prior to beginning the project. As the water entering this stream has been exposed to the sun in
this same manner for over twenty years, we are confident this stream temperature has been
elevated during the summer months for many years.

Mr. Landon Davidson
October 17, 2017
Page 2
If you have any questions regarding this matter or require further information, please do
not hesitate to contact me at [phone] ext. 1602.
Enclosure
EA Files; Angela Poston; Steve Wilson
Sincerely,
Jeffrey S. Ferguson, E E.
Sr. Environmental Engineer
UNIMIN CORPORATION

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19-0ct
26 -Oct -
2 -Nov
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16-N0y
23 -Nay
30 Noy -
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