NC0073539_Draft Permit_20231024

ROY COOPER
Governor _ :
ELIZABETH S.BISER 4�T�
Secretory
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
October 24, 2023
Joe Pearce and Robyn Lambeth
Aqua North Carolina, Inc.
202 MacKenan Drive
Cary,NC 27511
Subject: Draft NPDES Permit NC0073539
Willowbrook Subdivision WWTP
Grade WW-2 WPCS
Mecklenburg County
Dear Permittee:
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:
➢ Updated the Supplement to Permit Cover Sheet by adding the aerated flow equalization tank to
the treatment components section.
➢ Added revised ammonia limits, based on the instream waste concentration calculations and 2016
NH3 guidance document, that will take effect on 1/1/2028. These revised limits include, a
monthly summer limit of 2 mg/L, a daily summer limit of 10 mg/L, a monthly winter limit of 5
mg/L, and a daily winter limit of 25 mg/L. This change is shown in the table in Part I. A. (1).
➢ Electronic data submission requirements have been updated in Part I. A. (2).
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.
With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Mecklenburg 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 [e-mail].
,f D North Carolina Depamnent of Etrvirotul Service Center I Ralciglt,North Carolina 27G99-1617
919.707.9000
flEyrp.E,a M EmMvwwYl a..,

Page 2 of 2
NPDES Permit NC0073539
Sincerely,
Environmental Specialist II
NPDES Compliance and Expedited Permitting

Permit NC0073539
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 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Aqua North Carolina, Inc.
is hereby authorized to discharge wastewater from a facility located at the
Willowbrook Subdivision WWTP
12309 Ramah Creek Court
Huntersville
Mecklenburg County
to receiving waters designated as Ramah Creek in subbasin 03-07-11 of the Yadkin-Pee Dee River Basin in
accordance with effluent limitations,monitoring requirements,and other conditions set forth in Parts I,II,III,
and N hereof.
This permit shall become effective
This permit and authorization to discharge shall expire at midnight on November 30,2028.
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 June 3, 2028 (180 days before the expiration of
this permit).
Signed this day
Richard E. Rogers,Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 6

Pennit NC0073539
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.
Aqua North Carolina, Inc. is hereby authorized to:
1. Continue to operate an existing 0.048 MGD wastewater treatment system that includes the
following components:
• Bar screen
• Aeration basin
• Clarifier
• Tablet chlorination w/contact tank
• Dechlorination
• Aerated sludge holding tank
• Continuous flow measurement
• Composite sampler
• Auxillary power back up w/automatic transfer switch
• Aerated flow equalization tank
The facility is located at the Willowbrook Subdivision WWTP [12309 Ramah Creek Court,
Huntersville] in Mecklenburg County.
2. Discharge from said treatment works at the location specified on the attached map via Outfall 001
into Ramah Creek [Stream Index: 13-17-4-4], currently classified C waters in subbasin 03-07-11
[HUC: 030401050101] of the Yadkin-Pee Dee River Basin.
Page 2 of 6

Permit NC0073539
PARTI
Grade WW-2 Biological Water Pollution Control System [15A NCAC 08G.0302]
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored'
by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Daily Measurement Sample Sample
eDMR Codes Average Maximum Frequency Type Location2
Flow 50050 0.048 MGD Continuous RecordingInfluent or
Effluent
BOD,5-day(20°C)—Summer* C0310 19.0 mg/L 28.5 mg/L Weekly Composite Effluent
BOD,5-day(20°C)— Winter* C0310 30.0 mg/L 45.0 mg/L Weekly Composite Effluent
Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Weekly Composite Effluent
NH3 as N—Summer* C0610 11.0 mg/L 35.0 mg/L 2/Month Composite Effluent
NH3 as N— Winter* C0610 Weekly Composite Effluent
NH3 as N—Summer#3 C0610 2.0 mg/L 10.0 mg/L 2/Month Composite Effluent
NH3 as N— Winter#3 C0610 5.0 mg/L 25.0 mg/L 2/Month Composite Effluent
Dissolved Oxygen 00300 Daily Average>5.0 Weekly Grab Effluent
Fecal Coliform(geometric mean) 31616 200/100 ml 400/100 ml Weekly Grab Effluent
Total Residual Chlorine4 50060 28 µg/L 2/Week Grab Effluent
Temperature(°C) 00010 Daily Grab Effluent
pH 00400 Not<6.0 nor>9.0 Weekly Grab Effluent
Standard Units
Dissolved Oxygen 00300 Weekly Grab Upstream&
Downstream
WeeklyGrab Upstream&
Temperature(°C) 00010 Downstream
*Summer: April 1 —October 31
*Winter: November 1 —March 31
Footnotes:
l. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR system[see A. (2)].
2. Upstream:above the discharge point;Downstream:0.6 mile below the discharge point at NCSR 2438.
3. Revised ammonia limits,based on the IWC calculations and 2016 NH3 guidance document,will take effect 1/1/2028.
4. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit.However,
the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory(including
field certified),even if these values fall below 50 µg/L.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS
Page 3 of 6

Permit NC0073539
A. (2.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 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)l
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://deq.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.
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:
Page 4 of 6

Permit NC0073539
• 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 information 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://www.federalregister.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 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:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 5 of 6

Permit NC0073539
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.)
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:
http://deq.nc.gov/about/divisions/water-resources/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 true, accurate,
and complete. lam aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)1
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].
Page 6 of 6

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Willowbrook Subdivision WWTP
111;ik
Facility 414101114_
NPDES Permit NC0073539
Location
Latitude: 35°26'38" Sub-Basin: 03-07-11
Longitude: 80°49'09" Receiving Stream: Ramah Creek
Quad Name: Cornelius t Natth Mecklenburg County
(Map not to scale)
Stream Class: C