NC0026492_Draft Permit_20240319

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
March 19, 2024
Mr. Stephen A. Hall, Wastewater Superintendent
Town of Belhaven
PO Box 220
Belhaven, North Carolina 27810
Subject:
Dear Mr. Hall:
Draft NPDES Permit Modification
Permit NCO026492
Belhaven WWTP
Beaufort County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
Based on review of the submitted Water Effects Ratio (WER) study for evaluation of
site -specific Total Copper limits and results of a reasonable potential analysis run on
effluent copper data, the Total Copper permit limits have been revised and take effect
upon issuance of the permit modification.
As the total zinc and total copper compliance schedule will expire by the effective date of
the permit modification, the compliance schedule special condition has been removed
from the permit.
To allow the Permittee the option to continue using WER-based allowable concentrations
for Total Copper limit development in the next permit cycle, a special condition requiring
the Permittee to conduct and submit the results of a WER study confirmation test for
review with the permit renewal application.
The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included
in this draft document (cover, map, and Part I). The conditions are the same as in your current
permit except that agency and division names have been updated. The latest version is available at
https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Beaufort County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after
receipt of this draft permit.
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.707.9000
neper .mo F.o. wquay

Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit, please call me at [phone] or by email at [e-mail].
Sincerely,
DOCUSignned by:
(. e_
7900A4FBFCA14FD...
Nick Coco, PE
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Washington Regional Office/Water Quality/David May and Robert Bullock
DWR/Aquatic Toxicology Branch/Cindy Moore & Madison Meyers
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.7()7.9(]0(]
neper .mo F.o. wnual�

Permit NCO026492
PART I
A.(5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water
Pollution Control System [15A NCAC 08G .0302]
a. Beginning on the effective date of this permit and lasting until permit expiration, the Permittee is
authorized to discharge treated wastewater from outfall 001. Such discharges shall be limited
and monitored) by the Permittee as specified below:
PARAMETER
Parameter Code
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow 50050
1.0 MGD
Continuous
Recording
I or E
Total Monthly Flow 82220
Monitor and Report
Monthly
Recorded or
Calculated
I or E
BODs (20°C) 3
(April 1 - October 31) C0310
5.0 mg/L
7.5 mg/L
2/Week4
Composite
I and E
BODs (200C) 3
(November 1 -March 31) C0310
10.0 mg/L
15.0 mg/L
2/Week4
Composite
I and E
Total Suspended Solids3 C0530
15.0 mg/L
20.0 mg/L
2/Week4
Composite
I and E
Ammonia (NH3 as N)
(April 1 - October 31) C0610
1.0 mg/L
3.0 mg/L
2/Week4
Composite
E
Ammonia (NH3 as N)
(November 1 - March 31) C0610
1.8 mg/L
5.4 mg/L
2/Week4
Composite
E
Enterococci 61211
(geometric mean)
35/100 mL
276/100 mL
2/Week4
Grab
E
Dissolved Oxygen 00300
Daily Average >_ 6.0 mg/L
Daily
Grab
E
Temperature, °C 00010
Monitor and Report
Daily
Grab
E
pH 00400
Between 6.8 and 8.5 standard units
Daily
Grab
E
TKN, mg/Ls 00625
Monitor and Report
Weekly
Composite
E
NO3-N + NO2-N, mg/Ls 00630
Monitor and Report
Weekly
Composite
E
TN, mg/Ls C0600
Monitor and Report
Weekly
Composite
E
TN Load QM600
QY600
Monitor and Report (lb/mo)
14,261lb/yr7
Monthly
Calculated
E
Annually
Calculated
E
TP, mg/Ls C0665
Monitor and Report
Weekly
Composite
E
TP Load6 QM665
QM665
Monitor and Report
2,577lb/yr7
Monthly
Calculated
E
Annually
Calculated
E
Total Copper 01042
7.5 pg/L
11.6 lag/L
Monthly
Composite
E
Total Zinc 01092
42.8 lag/L
47.6 pg/L
Monthly
Composite
E
Acute Toxicity$ TGE6C
See Note 8
Quarterly
Composite
E
Effluent Pollutant Scan NC01
Monitor and Report
Footnote 9
E
Dissolved Oxygen, mg/L 00300
Monitor and Report
Variable2
Grab
U, D
Temperature, °C 00010
Monitor and Report
Variable'
Grab
U, D
Fnntnntp-
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system.
See Special Condition A.(8.).
(Footnotes continued on next page.)
Page 3 of 13 Michael Montebello, NPDES Branch Chief
Effective Date: May 1, 2024

Permit NCO026492
Footnotes (continued
2. Sample Location: I- Influent. E- Effluent. U- Upstream at least 200 feet from Outfall 001. D - Downstream from
Outfall 001 before the confluence of unnamed tributary to Battalina Creek and Battalina Creek. Stream samples
shall be collected three times per week during the months of June, July, August, and September and weekly during
the remainder of the year. Instream monitoring requirements are waived as long as the Permittee maintains
membership in the Tar -Pamlico Basin Association. If the Permittee ceases membership, then all instream
monitoring requirements specified in this permit are immediately reinstated.
3. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value
(85% removal).
4. 2/Week sampling must occur on any two non-consecutive days during the calendar week.
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl
Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. TP is Total Phosphorus.
6. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of time. See
Special Condition A. (2.) Calculation of TN or TP Loads.
7. Compliance with mass limits shall be determined in accordance with Special Condition A. (3.) Annual Limits for
Total Nitrogen or Total Phosphorus.
8. Acute Toxicity (Pimephales Promelas) P/F at 90%, February, May, August and November, see special condition
A.(5.).
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A.(6.)].
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) CALCULATION OF TOTAL NITROGEN AND TOTAL PHOSPHORUS LOADS
[G.S.143-215.1(b)]
(a.) The Permittee shall calculate monthly and annual TN Loads as follows:
(i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorus concentration
(mg/L) of the composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the
month (MG/mo)
8.34 = conversion factor, from (mg/L x MG) to pounds
(ii.) Annual TN (or TP) Load (lb/yr) = Sum of the 12 Monthly TN (or TP) Loads for the
calendar year
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo)
in the appropriate discharge monitoring report for each month and shall report each calendar year's
results (lb/yr) with the December report for that year.
A. (3.) ANNUAL LIMITS FOR TOTAL NITROGEN OR TOTAL PHOSPHORUS
[G.S. 143-215.1(b)]
(c.) Total Nitrogen (TN) and Total Phosphorus (TP) allocations and load limits for NPDES
dischargers in the Tar -Pamlico River basin are annual limits and apply on a calendar year basis.
(d.) For any given calendar year, the Permittee shall be in compliance with the annual TN (or TP)
Load limit in this Permit if:
Page 4 of 13 Michael Montebello, NPDES Branch Chief
Effective Date: May 1, 2024

Permit NCO026492
A.(7.) WATER EFFECTS RATIO CONFIRMATION STUDY FOR TOTAL COPPER LIMITS
[G.S. 143-215.1(b)]
If the Permittee wishes to continue usage of the Water Effects Ratio (WER) for evaluation of
Total Copper effluent data over the next permit cycle, the Permittee shall conduct one WER
study round using Pimephales promelas as the test organism. The Permittee shall submit the WER
study results and a completed WER study review checklist with the permit renewal application.
A.(8.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S.143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)]
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. The eDMR system may be
accessed at: https://deg.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,1.1,
2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to
the following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See "How to Request a Waiver from Electronic Reporting' section below.
Regardless of the submission method, the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Page 10 of 13 Michael Montebello, NPDES Branch Chief
Effective Date: May 1, 2024