NC0083321_Comments_20240112

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ONWASA
onwasa corn
228 Georgetown Rd
Jacksonville. NC 28540
January 5, 2024
Sydney Deuterman, Environmental Specialist II
NPDES Compliance and Expedited Permitting RECEIVED
Division of Water Resources, NCDEQ
1617 Mail Service Center JAN 1 2 2024
Raleigh, North Carolina 27699-1617
NCDEQ/DWR/NPDES
RE: Draft NPDES Permit No. NC0083321
Hubert Water Treatment Plant
Grade 1 Physical Chemical WPCS
Onslow Water and Sewer Authority, Onslow County
Y
Ms. Deuterman:
In response to your letter of December 5, 2023, regarding the above-referenced
draft NPDES permit (renewal) for ONWASA's Hubert Water Treatment Plant, we offer the
following comments:
Page 2 of 9, Item 1
Please remove potassium permanganate from the list of chemicals used at the plant and
replace it with sodium permanganate. Storage and chemical systems were modified in
2023 to feed sodium permanganate for iron/manganese removal; a copy of the NCDEQ
Final Approval letter for this work is attached.
Page 5 of 9, Part 1, Section A.(3) - Permit Re-Opener: Whole Effluent Toxicity
While there are no proposed revisions to the language within this section, a follow-up
meeting requested by NCDEQ staff to discuss operational changes that have significantly
reduced acute toxicity test failures has not yet been scheduled. Please have appropriate
staff contact Treatment Plant Administrator Seth Brown (sbrownonwasa.com) to
schedule this meeting.
Page 6 of 9, Section A.(4) - Schedule of Compliance (Outfall 001)
Please provide justification for the requirement to provide a Corrective Action Plan
submittal by July 1, 2024. Testing completed over the last two years (and previously
reported to NCDEQ) indicate Total Copper, Total Lead and Total Zinc levels consistently
below the limits scheduled to go into effect on July 1, 2025. What corrective actions are
then required?

Page Two
January 5, 2024
Thank you for the opportunity to review the draft permit and offer comments.
Please feel free to contact me directly at [phone] or dmohronwasa.com if you
have any questions on this information.
Sincerely,
464/
David M. Mohr, P.E.
Chief Operations Officer
Onslow Water and Sewer Authority
Encl.
C: Seth Brown, ONWASA Treatment Facilities Administrator
James Arnold, Hubert WTP ORC

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ELIZABETH S.BISER ! -� ' "
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RICHARD E.ROGERS.JR. NORTH CAROL IN 1,
D•r r.h. Envlronrnental Quality
September 26,2023
ONSLOW WATER AND SEWER AUTHORITY
ATTN: DAVID M.MOHR,PE CHIEF OPERATING OFFICER
228 GEORGETOWN ROAD
JACKSONVILLE,NC 28540
Re: Final Approval
Final Approval Date: September 26,2023
HUBERT WTP PERMANGANATE FEED SYS
' MODIFICATIONS
Serial No.: 23-00485
Water System Name:ONSLOW WTR AND SEWER
AUTHORITY
Water System No.:NC0467035
Onslow County
Dear Sir/Madam:
The Department received an Engineer's Certification statement and an Applicant's Certification concerning the above
referenced project.The Engineer's Certification verifies that the construction of the referenced project has been completed in
accordance with the engineering plans and specifications approved under Department Serial Number 23-00485.The Applicant's
Certification verifies that an Operation and Maintenance Plan and Emergency Management Plan have been completed and are
accessible to the operator at all times and available to the department upon request and that the system will have a certified operator
as required by 15A NCAC 18C.1300.
The Department has determined that the requirements specified in 15A NCAC 18C.0303(a)and(c)have been met,and
therefore,issues this Final Approval in accordance with Rule.0309(a).
Please contact us at(919)707-9100 if you have any questions or need additional information.
Sincerely,
C)� Z S'`J
Rebecca Sadosky,Ph.D.,Chief
Public Water Supply Section
Division of Water Resources,NCDEQ
cc: HEIDI COX,Regional Engineer
Onslow County Health Department I
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