NCG500594_approval_20240503

DocuSign Envelope ID: 7F01468C-42EC-474F-985C-9A20C5307835
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
May 3, 2024
To: Joyce Dishmon
Duke Energy
(via email: [e-mail])
From: Cindy Moore
Aquatic Toxicity Branch
Subject: Biocide Use Review
Duke Energy Progress, Inc. — Richmond County Combustion Turbine Plant
NPDES # NCG500594
Richmond County
Duke Energy Progress, Inc. has requested approval because they are changing vendors for the
Sulfuric Acid from Brenntag to Southern States. These products will be discharged into Marks
Creek.
The use of Southern States -Sulfuric Acid (for pH control) within the cooling tower discharge is
monitored by checking the pH parameter that is measured under the NPDES permit. This facility
has not had any recorded exceedances of this parameter. The sulfuric acid dosage is maintained
on an alarm system and will sound if anything is out of compliance. Therefore, use of Southern
States -Sulfuric Acid as proposed at the Richmond County Combustion Turbine Plant is
acceptable.
If you have any questions or concerns, please contact Cindy Moore at [phone] or
[e-mail].
Sincerely,
LVU
uSigned by:
AUbL
61A0057404B2...
Cindy Moore, Supervisor
Aquatic Toxicology Branch
Division of Water Resources, NCDEQ
cc: Charles Weaver, DWR (via email: charles.weavergdeq.nc.gov)
Mark Brantley, FRO (via email: [e-mail])
ATB Electronic File & Laserfiche
North Carolina Department of Environmental Quality I Division of Water Resources I Bio Lab
4401 Reedy Creek Road I 1621 Mail Service Center I Raleigh, North Carolina 27699-1621
NORTHCARouNAD J 919.743.8400