NC0021342_Draft Permit_20240306

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Mayor Darlene Spivey
Town of Trenton
P.O. Box 399
Trenton, North Carolina 28585
Dear Permittee:
M STAT3o,,�
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D
NORTH CAROLINA
Environmental Quality
March 5, 2024
Subject: Draft NPDES Permit NCO021342
Trenton WWTP
Grade WW-3 WPCS
Jones County
The Division has reviewed your request to renew the subject permit. Enclosed with this letter is a copy
of the draft permit for your facility. Please review this draft carefully to ensure your thorough
understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
➢ NH3 as N winter effluent limits were added to Part I. A. (1) based on the allowable concentration
of NH3 as N determined from the instream waste concentration calculations. The NH3 as N
winter effluent limit can be no less stringent than 2 times the summer limit to comply with
2B.0404 (c). The NPDES guidance document for ammonia limit calculations is attached for
your reference.
➢ The Measurement Frequency for BOD, TSS, Ammonia Nitrogen, and Fecal Coliform was changed from
3 times per week to 2 times per week in Part I A. (L) due to the accepted monitoring frequency reduction
request.
➢ Monitoring for Mercury in accordance with Special Condition A. (5.) was added to the table in Part I. A
(0.
➢ Updated the Supplement to Cover Sheet with the specific treatment components that were
installed/constructed with the upgrade to 0.140 MGD and removed the language referencing the
Authorization to Construct, as this facility is fully built and operational as of 2019.
)0- Removed the effluent limits for the 0.070 MGD plant that was decommissioned.
➢ A reopener condition for all Neuse River discharge permits has been added at Part I. A. (6.).
➢ Electronic data submission requirements have been updated.
➢ Updated address of WWTP on Cover Sheet and Supplement to Permit Cover Sheet.
➢ Updated map with new WWTP address and new outfall location, including new coordinates.
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.
North Carolina Department of Environmental Quality I Division of Water Resources
D E Q 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA 919.707.9000
oepnrlmeM M umim— MI a�ar�

Page 2 of 2
NPDES Permit NCO021342
With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Jones County area, per EPA requirements. Please
provide your comments, if any, to me at the e-mail address below no later than 30 days after
receiving this draft permit.
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 the draft, please contact me at caroline.robinsongdeq.nc.gov.
Sincerely,
Environmental Specialist II
NPDES Compliance and Expedited Permitting

Permit NCO021342
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute l 43-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
Town of Trenton
is hereby authorized to discharge wastewater from a facility located at the
Trenton Wastewater Treatment Plant
1212 Mayfield Road
Trenton
Jones County
to receiving waters designated as the Trent River in subbasin 03-04-11 of the Neuse River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II, III and IV hereof.
This permit shall become effective
This permit and authorization to discharge shall expire at midnight on May 31, 2029.
If the permittee intends to continue to discharge at the facility beyond the term of this permit, a
renewal application must be submitted no later than December 2, 2028 (180 days before the
expiration of this permit).
Signed this day
John E. Hennessy, Section Chief Regional Operations
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NCO021342
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are
hereby revoked. As of this permit issuance, any previously issued permit bearing this number is
no longer effective. Therefore, the exclusive authority to operate and discharge from this facility
arises under the permit conditions, requirements, terms, and provisions included herein.
The Town of Trenton is hereby authorized to:
1. Continue to operate and maintain an existing 0.140 MGD wastewater treatment facility
consisting of the following components:
• 1.12 MGD manual bar screen
• 70,000-gallon equalization basin
• Coarse bubble aeration diffusers
• 7.5 HP positive displacement blower
• Two 98 GPM 2.0 HP submersible centrifugal equalization pumps
• Flow proportioning control box for anaerobic chambers
• Two 4,060-gallon anaerobic chambers
• Two 10,500-gallon anoxic chambers
• Two 47,833-gallon aerobic chambers with coarse air bubble diffusers
• Four rotary positive displacement blowers
• Two Internal mixed liquor suspended solids submersible pumps
• Two water circular clarifiers
• One rapid sand tertiary filter 'kv
• Backup phosphorus removal system
• Single channel UV disinfection
• Post aeration coarse bubble diffuser system
• Two submersible effluent pumps
• One refrigerated flow paced effluent sampler
• One 33,000-gallon aerobic sludge tank
• One 16,500-gallon aerobic sludge digester
• Standby generator system with automatic transfer switch
This facility is located at the Trenton Wastewater Treatment Plant, 1212 Mayfield Road,
Trenton in Jones County.
2. Discharge from said treatment works at the location specified on the attached map via Outfall
001 into the Trent River [Stream Index: 27-101-(1)], currently classified C-Swamp NSW
waters in sub -basin 03-04-11 [HUC: 030202040204] of the Neuse River Basin.
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Permit NCO021342
PART I
Grade WW-3 Biological Water Pollution Control System [15A NCAC 08G 0302]
A. (L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 10.140 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge treated domestic wastewater from Outfall 001. Such discharges shall
be limited and monitored' by the permittee as specified below:
PARAMETER CHARACTERISTICS
PARAMETER CODE
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow 50050
0.140 MGD
Continuous
Recording
I or E
Total Monthly Flow (MG)
Monitor and Report
MOML
Recording or
Calculated
I or E
BOD, 5 day, 20°C3 C0310
15.0 mg/L
22.5 mg/L
2/Week'q4jjhCqpiposite
I and E
Total Suspended Solids C0530
30.0 mg/L
45.0 mg/L
2/Week IlWomposite
I and E
NH3 as N — Summer* C0610
4.6 mg/L
13.8 mg/L
2/Week
Composite
E
NH3 as N (mg/L) — Winter* C0610
9.2 mg/L
27.6 mg/L
2/Week
Composite
E
Dissolved Oxygen (mg/L) 00300
Daily Minimum > 5.0 mg/L
3/Week
Grab
E
Dissolved Oxygen (mg/L) 00300
Variable2
Grab
U and D
pH 00400
Between 6.0 and 9.0 Standard Units
3/Week
Grab
E
Fecal Coliform (geometric mean) 31616
200/ 100 mL
400/100 mL
2/Week
Grab
E
Temperature °C 00010
3/Week
Grab
E
Temperature °C 00010
Variable2
Grab
U and D
TKN'(mg/L) 00625
Monitor and Report
Weekly
Composite
E
NO3-N + NO2-N' (mg/L) 00630
Monitor and Report
Weekly
Composite
E
Total Nitro en' m C0600
Monitor and Report
Weekly
Calculated
E
TN Load',5 QM600
Monitor and Report (pounds/month)
Monthly
Calculated
E
TN Load',5 QY600
1,415 pounds/year6
Annually
Calculated
E
Total Phosphorus (mg/L) C0665
1.0 mg/L
Weekly
Composite
E
Mercury COMER
Monitor and Report
Once per
permit cycle
Grab
E
*Summer: April 1 — October 31; Winter: November I —March 31
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Special Condition A. (7.).
2. Sample locations I -Influent, E-Effluent, U-Upstream = approximately 600 feet north from the NC-41
Bridge at the power line easement, D-Downstream = approximately 2.8 miles downstream from the
outfall but no further than Paul Drive. Upstream and downstream samples shall be grab samples
collected 3/week during June, July, August, and September and 1/week during the remainder of the
year.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85% removal).
4. 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.
5. TN Load is the mass quantity of Total Nitrogen discharged in a given period of time. See Special
Condition A. (3.), Calculation of Total Nitrogen Loads.
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Permit NCO021342
6. Compliance with this limit shall be determined in accordance with Special Condition A. (4.) of this
permit, Total Nitrogen Allocations.
7. Compliance with this limit shall be determined in accordance with Special Condition A. (5.) of this
permit, Effluent Mercury Analysis.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS.
A. (2.) CALCULATION OF TOTAL NITROGEN LOADS
[G.S. 143-215.1(b)]
a. The permittee shall calculate monthly and annual TN Loads as follows:
i. Monthly TN Load (pounds/month) = TN x TMF x 8.34
where:
TN = the average Total Nitrogen concentration (mg/L) of the
composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the
month (MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
ii. Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loads for the
calendar year W
b. The permittee shall report monthly Total Nitrogen results (mg/L and pounds/month) in the
appropriate discharge monitoring report for each month and shall report each year's results
(pounds/year) with the December report for that year.
A. (3.) ANNUAL LIMITS FOR TOTAL NITROGEN
[G. S. 143-215.1(b)]
a. Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the Neuse
River basin apply on a calendar year basis.
b. For any given calendar year, the permittee shall be in compliance with the annual TN Load
limit in this permit ii
(i.) the permittee's annual TN discharge is less than or equal to its TN Load limit, or
(ii.) the permittee is a co-permittee member of a compliance association.
If the permittee is not a co-permittee member of a compliance association and the
permittee's cumulative annual TN discharge exceeds the effective TN Load limit in this
permit at any point during the calendar year, the permittee is in violation of its TN Load
limit, and each day of a continuing violation shall constitute a separate violation.
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Permit NCO021342
d. The TN Load limit in this permit (if any) may be modified as the result of allowable
changes in the permittee's TN allocation.
i. Allowable changes include those resulting from purchase of TN allocation from the
Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation between the
permittee and other dischargers; regionalization; and other transactions approved by
the Division.
ii. The permittee may request a modification of the TN Load limit in this permit to reflect
allowable changes in its TN allocation. Upon receipt of timely and proper application,
the Division will modify the permit as appropriate and in accordance with state and
federal program requirements.
iii. Changes in TN limits become effective on January 1 of the year following permit
modification. The Division must receive application no later than August 31 for
changes proposed for the following calendar year.
iv. Application shall be sent to: `
NCDWR / NPDES Programs
Attn: Neuse River Basin Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617
e. If the permittee is a member and co-permittee of an approved compliance association, its
TN discharge during that year is governed by that association's group NPDES permit and
the TN limits therein.
i. The permittee shall be considered a co-permittee member for any given calendar year
in which it is identified as such in Appendix A of the association's group NPDES
permit.
ii. Association roster(s) and members' TN allocations will be updated annually and in
accordance with state and federal program requirements.
iii. If the permittee intends to join or leave a compliance association, the Division must be
notified of the proposed action in accordance with the procedures defined in the
association's NPDES permit.
(A) Upon receipt of timely and proper notification, the Division will modify the
permit as appropriate and in accordance with state and federal program
requirements.
(B) Membership changes in a compliance association become effective on January 1
of the year following modification of the association's permit.
f. The TN monitoring and reporting requirements in this permit remain in effect until
expiration of this permit and are not affected by the permittee's membership in a
compliance association.
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Permit NC0021342
A. (4.) TOTAL NITROGEN ALLOCATIONS
[G.S. 143-215.1(b)]
a. The following table lists the Total Nitrogen (TN) allocation(s) assigned to, acquired by, or
transferred to the permittee in accordance with the Neuse River nutrient management rule
(T 15A NCAC 02B.0234) and the status of each as of permit issuance. For compliance
purposes, this table does not supercede any TN limit(s) established elsewhere in this permit
or in the NPDES permit of a compliance association of which the permittee is a co-
permittee member.
Allocation Amount (1)
Allocatio
n Type
Source
Date
Status
Estuary (lb/
Discharge
ear
(lb/year)
Assigned by Rule
Base
(T15A NCAC
12/7/97
1,415
1,415
Active
0213.0234
Total
1,415
1,415
Active
Footnote: (1) Transport Factor = 100%
a. Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change of any of the listed allocations to from Reserve to
Active status shall be considered a major modification of this permit and shall be subject to
the public review process afforded such modifications under state and federal rules.
A. (5.) EFFLUENT MERCURY ANALYSI
[G. S. 143-215.1(b)]
The permittee shall provide one effluent mercury analysis, using EPA Method 1631E, in
conjunction with the next permit renewal application. The analysis should be taken within 12
months prior to the application date. Any additional effluent mercury measurement conducted
from the effective day of this permit and up to the application date shall also be submitted with
the renewal application.
If the result of the mercury analysis is not provided with the application, the application may be
returned as incomplete and the permittee considered non -compliant.
A. (6.) PERMIT RE -OPENER: NUTRIENT MANAGEMENT
[NCGS 143-215.1 (b)]
a) Pursuant to N.C. General Statues Section 143-215.1 and implementing rules found in Title
15A of North Carolina Administrative Code, Subchapter 02H, specifically, 15A NCAC
02H.0112(b)(1) and 02H.0114(a), and Part II, Sections B.12 and B.13. of this Permit, the
Director of DWR may reopen this permit to require nutrient management measures for the
discharge. The results of water quality monitoring, modelling or other evaluations may
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Permit NCO021342
require that conditions for total nitrogen and total phosphorus control be imposed on this
permit.
b) The Division may, upon written notification to the permittee, re -open this permit in order to
incorporate or modify effluent limits, monitoring and reporting requirements, and other
permit conditions when it deems such action is necessary to implement TMDL(s) approved
by the USEPA.
A. (7.) ELECTRONIC REPORTING OF 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.
i
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)1
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:Hdeq.ne.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.
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Permit NC0021342
Monitoring results obtained during the previous month(s) shall be summarized for each
month and reported via the eDMR system no later than the last calendar day of the month
following the completed reporting period. 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.
Starting on December 21, 2025, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316 (b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to
Request a Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at
the time of each electronic submission. The permittee should use the EPA's website
resources to identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES infprmation from NPDES-regulated facilities means the
entity (EPA or the state authorized by EPA to implement the NPDES program) that is the
designated entity for receiving electronic NPDES data [see 40 CFR 127.2 (b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool
for each type of electronic submission and for each state. Instructions on how to access and
use the appropriate electronic reporting tool will be available as well. Information on EPA's
NPDES Electronic Reporting Rule is found at:
https:L+/ww.federalre ig ster•gov/documents/2015/10/22/2015-24954/national-pollutant-
discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements" section
above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To
obtain an electronic reporting waiver, a permittee must first submit an electronic reporting
waiver request to the Division. Requests for temporary electronic reporting waivers must be
submitted in writing to the Division for written approval at least sixty (60) days prior to the
date the facility would be required under this permit to begin submitting monitoring data and
reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the
Division unless the permittee re -applies for and is granted a new temporary electronic
reporting waiver by the Division. Approved electronic reporting waivers are not
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Permit NC0021342
transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are
found on the following web page:
h!Ltp://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.
(11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (11.) (a) or by a duly authorized representative of that person as described
in Part II, Section B. (11.) (b). A person, and not a position, must be delegated signatory
authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR
user account and login credentials to access the eDMR system. For more information on
North Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account,
please visit the following web page:
hqp://deq.nc.gov/about/divisions/water-Tesources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system
shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under
my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief, trueiaccurate, and complete. I am aware that there are significant penalties for
submitting fal. e information, including the possibility of fines and imprisonment for knowing
violations. "
5. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from
the date of the report. This period may be extended by request of the Director at any time [40
CFR 122.41].
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NCO021342 — Trenton WWTP
Town of Trenton
Latitude: 35° 03' 54.2" N Longitude: 77' 21' 04.0" W
Receiving Stream: Trent River USGS Quad Name: Trenton, NC
Stream Class: C-Swamp, NSW Subbasin: Neuse / 03-04-11
Facility
Location
Jones County
L-l�/GJI Map not to scale