NC0000361_Permission to discharge up to 100 lbs/day_20190711

i,..,k-z ,
ROY COOPER 1 �;
Governor '; � 1 `� S
MICHAEL S.REGAN ..w .;=
Secretary
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
July 11, 2019
Jeffrey Ferguson
Sibelco NA, Crystal Facility
136 Crystal Drive
Spruce Pine, North Carolina 28777
Subject: Trial Flotation Process
Permit NC0000361
Schoolhouse Facility
Avery County
Dear Mr. Ferguson;
On April 17, 2019, Sibelco North America requested permission to discharge up to 100
lbs/day of potassium chloride (KCl) for up to 20 days for research purposes involving the
flotation processes at their Schoolhouse Facility, NPDES permit number NC0000361. Based
on the facility's average recorded flow,the effluent discharge concentrations for potassium
and chloride are each estimated to be less than 5 mg/L.The Division hereby allows the trial
process under the following monitoring conditions:
• Composite sampling shall be conducted weekly at permitted effluent Outfall 001 and
at an internal outfall after all treatment units but prior to the Effluent
Lagoon/Pond.
• The weekly sampling shall begin one-month prior to the trial addition of KCI,
continue during the month of the trial and for one month after the trial.
• Parameters to be sampled at both sampling locations shall be: Total Fluoride, Total
Suspended Solids,Total Potassium, and Chlorides. Fluoride,TSS, and Chlorides shall
use the same measurement units and parameter codes as currently reported on the
DMRs. Total Potassium shall be measured in mg/L and reported using parameter
code 00937.
• All results from Outfall 001 will be reported on the DMR.All results from the
internal outfall will be considered "Process Control" and retained by the facility and
submitted to the Division upon request.
• The Asheville Regional Office,Water Quality Regional Operations shall be notified at
least two business days prior to the commencement of the sampling protocol
outlined above to allow for inspection if deemed necessary.
C.�D E��,- North Carolina Department of Environmental Quality I Division of Water Resources
�dJ}� 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh,North Carolina 27699-1617
NORTH CAROLINA
pw +o+ +vuuu\ 919.707.9000

Application of KC1 at rates greater than 1001bs/day or for longer than 20 days may require permit
modification. If you have any questions or concerns, please contact David Hill at
[e-mail] or 919-707-3612.
Sincerely,
,,,z-,_(,,p,,,er-
ulie Grzy
Supervisor,NPDES Complex Permitting Unit
eCC:
DWR/Asheville Regional Office/Water Quality Regional Operations
Page 2 of 2