NC0038377_Comments_20240105 (3)

Baker, Caroline D
From: Wilson, Leanne <[e-mail]>
Sent: Friday, January 5, 2024 9:52 AM
To: Chernikov, Sergei
Cc: Slade, Joseph Heath; Tollie, Lori White; McDaniel, Kim Spence; Winston, Cynthia C;
Conner, Steven B
Subject: [External] Duke Energy Comments on Draft NPDES Permit NCO038377
Attachments: RE_ [External] RE_ Duke Energy Mayo NPDES NC0038377.pdf, 38377- fact sheet
-2023.docx; 38377-draft cover letter-2023.docx; 38377-Permit-2023.docx
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Sergei,
Duke Energy would like to submit the two comments concerning the draft NPDES permit for the Mayo Steam Station.
Duke Energy initiated dewatering of the ash basin in May 24t" of 2021 and since that time has submitted ample data to
return the sampling frequency at Outfall 002 to monthly. Instream monitoring and fish tissue data collection frequencies
have rightly been reduced because of this same data set. Duke Energy would like to again request that the sampling
frequency be returned to monthly.
The draft permit also incorrectly show toxicity for the internal outfall to the lined retention basin (Outfall 002a). All
wastewater flows at the Mayo Steam Station comingle at the final outfall to Mayo Reservoir, Outfall 002. Toxicity
sampling at an internal outfall is unsupported and wouldn't adequately characterize the Mayo discharge. Any toxicity
sampling should include all wastewater sources discharged to the receiving stream, as you agreed in the attached email.
Duke Energy requests that the toxicity sampling requirement be removed from Outfall 002a and remain only on the final
discharge at Outfall 002.
Thank you,
Leanne Wilson, MEA
Sr. EHS Professional
Mayo Station/Cape Fear
Duke Energy
10660 Boston Rd./ 500 CP&L Rd.
Roxboro, NC 27574/ Moncure, NC 27559
Office: 336-597-7324/ 919 516-1986
Cell: 336-504-2827
Leanne. Wilson@duke-energy. co m
fDUKE
en ENERGY.