NC0005363_Approval_20240403

North Carolina Department of Environmental Quality | Division of Water Resources | Bio Lab
4401 Reedy Creek Road | 1621 Mail Service Center | Raleigh, North Carolina 27699-1621
919.743.8400

April 3, 2024

To: Randy Hawkins
Duke Energy
(via email: [e-mail])

From: Cindy Moore
Aquatic Toxicity Branch

Subject: Biocide Use Review
Weatherspoon Steam Electric Plant
NPDES # NC0005363
Robeson County

Weatherspoon Steam Electric Plant has requested approval of the below chemicals:

Product/Chemical Approval / Comment
Aluminum Sulfate 50% Soln Approved – 37090.51 grams/day

Although this permit has an aquatic toxicity testing requirement, it also contains a biocide
condition which prompted the permittee to request approval.

Calculations predict the use of the above product, at the stated dosage rate and the permitted
IWC, will not cause toxic impacts to aquatic life.

If you have any questions or concerns, please contact Molly Nicholson at [phone] or
[e-mail].

Sincerely,

Cindy Moore, Supervisor
Aquatic Toxicology Branch
Division of Water Resources, NCDEQ

cc: Trupti Desai, DWR (via email: [e-mail])
Mark Brantley, FRO (via email: [e-mail])
ATB Electronic File & Laserfiche

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