NC0004987_Request to Modify pH Sampling Location_19950808

State of North Carolina
Department of Environment,
Health and Natural Resources
Mooresville Regional Office
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
Linda Diane Long, Regional Manager
lkf?WA
DEHNR
DIVISION OF ENVIRONMENTAL MANAGEMENT
August 8, 1995 �QL (�S • a�J�i
Mr. John S. Carter, Technical Systems Manager
Environmental Division
Duke Power Company
13339 Hagers Ferry Road
Huntersvilie, N.C. 28078-7929
Dear Mr. Carter:
Subject: Request to Modify pH
Sampling Location
Marshall Steam Plant
NPDES Permit No. NC0004987
Catawba County
The staff of this Office has conducted a review of your
request dated August 2, 1995 to install a J -tube at the end of the
submerged ash basin discharge pipe for the purpose of monitoring pH
prior to final release into Lake Norman. Compliance sampling of all
other parameters will continue at the at the current location (ash
basin tower). You also requested approval for the possible
installation of a carbon dioxide feed system should it be necessary
for additional pH control.
Based on our review, we have no objections to the installation
of the J -tube in the end of the ash basin discharge pipe for the
purposes of measuring and determining compliance with the Permit
requirement (range) for pH. As for the request to install a carbon
dioxide feed system, it has been determined that an Authorization
to Construct (ATC) will not be necessary, therefore, such a system
can be constructed as needed to help regulate effluent pH
fluctuations.
919 North Main Street, Mooresville, North Carolina 28115 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Mr. John S. Carter
August 8, 1995
Page Two
If you have additional
onal questions or need further information,
please contact Mr. Michael Parker or me.
Sincerely,
D. Rex Gleason,.P.E.
Water Quality Regional Supervisor
Ruth Swanek w/drawing
MLP
h:\gen\g1tr1.doc
N
195
5
,o:c

MARSHALL STEAM STATION
NPDES OUTFALL 002