NCG500594_Approval_20240508

DocuSign Envelope ID:61241CFF-2798-44FF-BE73-7060A578C998
ROY COOPER _
Governor d C
ELIZABETH S.BISERr
Secretary •E .
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
May 8, 2024
To: Joyce Dishmon
Duke Energy
(via email: [e-mail])
From: Cindy Moore
Aquatic Toxicity Branch
Subject: Biocide Use Review-Reissued, Corrected pH Language.
Duke Energy Progress, Inc. —Richmond County Combustion Turbine Plant
NPDES #NCG500594
Richmond County
Duke Energy Progress, Inc. has requested re-approval because they are changing vendors for the
Sulfuric Acid from Brenntag to Southern States.This product 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 a reportable system in the control room. Each shift (every 12 hrs.)will check calibration of
the pH meter. 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(919) 743-8422 or
[e-mail].
Sincerely,
CUs yea by: 5/8/2024
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Cindy Moore, Supervisor
Aquatic Toxicology Branch
Division of Water Resources,NCDEQ
cc: Charles Weaver,DWR(via email: charles.weaver&deq.nc.gov)
Mark Brantley,FRO(via email: mark.brantle ,deq.nc.goy)
ATB Electronic File&Laserfiche
North Carolina Department of Environmental Quality I Division of Water Resources I Bio Lab
4401 Reedy Creek Road 1 1621 Mail Service Center I Raleigh,North Carolina 27699-1621
NORTH CAROLI D 919.743.8400