NC0000175_staff comments_19870413

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State of North Carolina
Department of Natural Resources and Community Development
Asheville Regional Office
James G. Martin, Governor S. Thomas Rhodes, Secretary
MEMORANDUM
TO:
THROUGH:
FROM:
DIVISION OF ENVIRONMENTAL MANAGEMENT
WATER QUALITY SECTION
April 13, 1987
Arthur Mouberry, Supervisor
Permits and Engineering Section
Forrest R. Westall
Water Quality Regiorj( ervisor
Michael R. Parker, Env pnmental Specialist
Water Quality Section
SUBJECT: Request to Revise NPDES Permit
Unimin Quartz Operations
NPDES Permit Number NC0000175
Mitchell County, North Carolina
Unimin Corporation, Indusmin, Inc. and The Feldspar Corporation
have each requested that their respective NPDES Permits be modified for
pH from the existing limit 6.0 s.u. to 9.0 s.u. to the limit in the old
permit 6.0 s.u. to 10.0 s.u. This office is aware of their request and
have been collecting flow, pH and alkalinity data from each company and
stream monitoring data from the North Toe River at Ingalls and the
North Toe River at Penland.
Also, we have been in contact with Randy Dodd of the Technical
Services Branch and they have a pH program model in which the river and
facility discharge data will be entered into the program. Each
facility will be modeled at the high and low pH limits to see if the
stream water quality standard for pH will be violated. Our recommend-
ations will be based on our review of the model results. This model
should be completed within two weeks.
call.
Should you have questions or wish to discuss this matter, please
to . 'han.• `a i \ b dr : I'ia PS.). Box 370 \;heville N.L. 288E 2_0370 ^ is lct>h