NC0059099_Permit (Modification)_20230405

n,STATE<,
ROY COOPER
Governor
ELIZABETH BISER
Secretary ,�a
RICHARD E. ROGERS, JR ��0""�•
Director NORTH CAROLINA
Environmental Quality
April 4, 2023
Amanda Berger, Director of Environmental Compliance
AQUA North Carolina, Inc.
202 MacKenan Court
Cary,North Carolina 27511
Subject: Review of Draft NPDES Permit NCO059099
Aqua NC—Lake Ridge Aero Park WWTP, Grade II
Citation Circle, Durham,North Carolina
Durham County
Ms. Berger:
In response to your request to renew the subject NPDES permit, signed July 25, 2023, the
Division of Water Resources (DWR or the Division)hereby transmits this draft permit for your
review and comment. Please review this document carefully to assure your understanding of the
permit limits and monitoring conditions, and to correct errors, if any.
Concurrent with this notification, the Division will solicit public comment on this draft by
publishing a notice in newspapers having circulation in the general Durham County area,
as required by the NPDES Program. Please provide your written comments, if any, to me
via email [e-mail]], or write to my attention care of NCDEQ / DWR/
NPDES Program no later than May 5, 2023, approximately 30 days after receiving this
letter. Your written comments are welcome,but they are not mandatory.
The Division notes from your application that AQUA has made no significant alterations to its
effluent treatment processes since last renewal. Accordingly, we have only updated your permit
format to revise text.
The NPDES standard conditions (Parts II, III, and IV), are part of this permit but are not included
in this draft document(cover, map, and Part I). The latest version of Parts II, III, and IV are
available at https://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file.
Please be reminded that the receiving stream, Panther Creek is tributary to Lower Falls Lake
classified as water supply, nutrient sensitive water, and habitat-critical area (WS-IV; NSW; CA.
Addressing these classifications is a priority, as DWR continues to evaluate instream data. If
there is noncompliance to this permit and stream impairment can be attributed to your facility,
DWR will require mitigative measures.
North Carolina Department of Environmental Quality I Division of Water Resources
D 1Q 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617--919.707.3616

Amanda Berger,Director of Environmental Compliance
AQUA North Carolina, Inc.
Permit Renewal-Draft Review
Apri12023
Following the mandatory 45-day public-comment period, the Division will review all pertinent
comments, if any, and take appropriate action prior to issuing an NPDES permit final. If you
have questions concerning this draft,please e-mail the undersigned [e-mail]].
Respectfully,
Joe R. Corpor n, P.G.
NC;OEQ/D /NPDES Permitting
Enclosure: NPDES Permit NC0059099 (renewal RAFT)
hc: NPDES Program Files [Laserfiche]
ec: RRO,Vanessa Manual.
OCU,Maureen Kinney
ATB,Cindy Moore
DWR/Public Water Supply Regional Engineer

Permit NCO059099
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NE DES)
In compliance with the provisions of North Carolina Gene to 143-215.1, other lawful standards
and regulations promulgated and adopted by the aro n Environmental Management
Commission, and the Federal Water P u ' n Contro t, as amended, the
AQUA orth o 'n , Inc.
is hereby authorized to discha wat om a facility located at the
R' e WTP
'tat' C' e, n heas of Durham
ounty
to receiving waters de ' ated as a d tributary to the Panther Creek arm of Falls Lake in the
Neuse River Basin in ac ance wi h effl t limits, monitoring requirements, and other conditions
set forth in Parts I, II, III a her o
This permit shall become effective 2023.
This permit and authorization to discharge shall expire at midnight on January 31, 2027.
Signed this day 2023.
for Richard E. Rogers, Jr., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0059099
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 0.016 MGD waste w er tment system with the following
components:
• Basket screen
• Aeration basin
• Chemical phosphorus removal using s sul e
• Two (2) secondary clarifiers
• Sludge holding tank
• Two (2) sludge digeste
• Dual (2)ultraviolet( sinfecf unit
• Post-aeration
these facilities c ed no o ham, a e Lake Ridge Aero Park WWTP, off Citation
Circle in Durham my and
2. discharge from said treatment works at the location specified on the attached map into an unnamed
tributary to the Panther Creek(an arm of Upper Falls Lake), a waterbody currently classified WS-
IV; NSW; CA within hydrological unit 03-04-01 [HUC: 03020202010404] within the Neuse River
Basin.

Permit NCO059099
A. (L) EFFLUENT LIMITS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq.,02B .0500 et seq.; 15A NCAC 08G.0302]WPCS Class II
During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge treated wastewater from outfall 001. Such discharges shall be
limited, monitored, and reported 1 by the permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Daily Measurement Sample Sample
PARAMETER CODE Average Maximum Frequency Type Location2
Flow 50050 0.016 MGD ontinuous Recordin Influent or
g Effluent
BOD,5-day(20°C) C0310 20.0 mg/L 30.0 mg/L ee Composite Effluent
Total Suspended Solids C0530 30.0 mg/L 45.0 g Weekly Composite Effluent
Fecal Coliform 31616 200/ 100mL 400/ 10 kly ab Effluent
(geometric mean
Ammonia(NH3 as N) C0610 7.0 mg/L mg/L eekly Co osite Effluent
Dissolved Oxygen 3 00300 Dail Ave not 0 eekly Grab Effluent
Temperature(°C) 00010 e ly Grab Effluent
Total Residual Chlorine 17 ekly Grab Effluent
pH d< td.u 't Weekly Grab Effluent
Temperature(°C) 0010 for&Re Weekly Grab Upstream&
Downstream
Dissolved Oxygen 00 \\�om\r&Report Weekly Grab Upstream&
Downstream
Total Nitrogen4 CO Mo to &Report(mg/L) Monthly Composite Effluent
Total Phosphorus C0665 on' r&Report(mg/L) Monthly Composite Effluent
Footnotes:
1. Beginning on the effective date,the Permittee shall submit discharge Monitoring Reports
electronically using NCDWR's eDMR submittal system [See A. (3.)].
2. Sample Locations: Upstream-at least 25 feet upstream from the outfall. Downstream-at the
railway crossing.
3. Dissolved Oxygen: The daily average effluent concentration shall not fall below 6.0 mg/L.
4. Alternate Disinfection: If the permitted UV system fails, an immediate alternate means of
disinfection is required [For instructions, see Special Condition A. (3.)]. Total Residual Chlorine
(TRC) shall be monitored in the event of UV failure,but only if chlorine is used to disinfect.
5. Total Nitrogen: For a given wastewater sample,record TN=TKN+NO3N+NO2N, where TN is
Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3N(Nitrate) and NO2N(Nitrite).
Condition:
The Permittee shall discharge no floating solids or foam visible in other than trace amounts.

Permit NCO059099
A. (2.) TOTAL NITROGEN ALLOCATIONS
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(T15A NCAC 02B .0234)and
the status of each as of permit issuance. For compliance purposes,this table does not supersede 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
ALLOCATION SOURCE DATE STATUS
TYPE Estuary Discharge
(lb/yr) (lb/yr)
Base Assigned by Rule 12/7/97; z
324 Active
(T15A NCAC 02B .0234) 4/1/0
Footnote: Transport Factor= 10%
b. Any addition, deletion,or modification of d allo ti n(other than to correct typographical errors)
or any change to Active status of an of the 's a catio all be considered a major modification of
this permit and shall be subject the blic r ew o s a ded such modifications under state and
federal rules.
A. (3.) TE O A �FECTION
If the wastewater tre nt plant tr i let(UV) disinfection system fails, underperforms, or
otherwise removed fro rvice, th e 'tt5e or his agent shall immediately inform the Surface
Water Protection Section f of the R leigh Regional Office (919-791-4200) and discuss temporary,
alternate means for effluent i 'nfe io .
If chlorine compounds are used temporary means of disinfection, the total residual chlorine (TRC)
concentration of the effluent must be monitored Daily while this method of disinfection is in use and
values must be reported on the discharge monitoring report. TRC in the effluent may not exceed 17
µg/L; therefore, dechlorination methods may also be necessary to ensure protection of water quality in
the receiving stream.
In the event that TRC monitoring should occur, 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.
Use of a disinfection system other than the permitted UV system during circumstances not deemed as
emergency and/or temporary(replacement of lamps, lamp cleaning or maintenance, etc.)will be
considered a violation of the terms of this permit.

Permit NCO059099
A. (4.) ELECTRONIC REPORTING - 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 I1 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. Re ortin Requirements [Supersede a -on D. . a Section E. a
The permittee shall report dischar e mon to e c onically using the NC DWR's
Electronic Discharge Monito ' g R ort(e R 'n e a lication.
Monitoring results obtaine ring th revio s onth( all be summarized for each month and
submitted electrons sin a eD system allows permitted facilities to enter
monitoring data d i s elec 1 1 ing the internet. The eDMR system may be
accessed at: h : de .nc. v/ but division ter-resources/edmr.
If a permittee is una to use th D ystem due to a demonstrated hardship or due to the
facility being physica cated n n area where less than 10 percent of the households have
broadband access, then a e p a waiver from the NPDES electronic reporting requirements
may be granted and discha e nitoring data may be submitted on paper DMR forms (MR 1, 1.1,
2, 3) or alternative forms app owed 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.

Permit NCO059099
Starting on December 21, 2020, 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 mus de tify the initial recipient at the time
of each electronic submission. The permittee should us e PA's website resources to identify
the initial recipient for the electronic submission.
Initial recipient of electronic NPDES informat' n in NPDES-r lated facilities means the
entity(EPA or the state authorized by EPA to i ment t e NPD ogram) that is the
designated entity for receiving electron' PDES a ee 0 CFR 1 . (b)].
EPA plans to establish a website that wil a to e ppropriate electronic reporting tool for
each type of electronic submi 'on d for ch In ctions on how to access and use the
appropriate electronic repo m o0 The ab a 1. Information on EPA's NPDES
Electronic Reporting Rule is ound at.
hLtps://www.feder e ' r. v um /20 0/22/2015-24954/national- ollutant-dischar e-
elimination-s s m- e ct n -re in
Electronic submi ns must a b e dates listed in the "Reporting Requirements" section
above.
3. How to Request a W 'v f lectronic Re ortin
The permittee may seek a to rary 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:
hltp:Hdeq.nc.gov/about/divisions/water-resources/edmr

Permit NC0059099
4. Signatory Requirements [Supplements Section B. (11.)(b) and Supersedes Section B.(11.) (d)]
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://deg.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DM usi the state's eDMR system shall
make the following certification [40 CFR 122.22]. STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
7 certify, under penalty of law, that this docum nd al tachme t were prepared under my
direction or supervision in accordance a syst si ed to assu at qualified personnel
properly gather and evaluate the inform ubmi d ased on my in uiry of the person or
persons who manage the system, or those r dire responsible for gathering the
information, the information mi is, he s owledge and belief, true, accurate,
and complete. I am aware a tere sig an i or submitting false information,
including the possibility o s and i rison t for ing violations."
5. Records t tion Su lements�n . 6. . The permittee shall retain records of all
Discharge Mo 1 ring Re uding eDMR submissions. These records or copies shall be
maintained for iod of a 1 st ars from the date of the report. This period may be
extended by reque the D e for at any time [40 CFR 122.41].

i
i
f
TWA
ILI
1? ,�
CreekUT to Panther Creek
(flows SE)
Panther -.
(fl
',lam` i •. � � ' . ,. : .� �►� r�,� .. ...��
\� >
AQUA NorthCarolina, ,
Lake Ridge Park WWTP
Receiving . ' (Upper
State Grid/USGS • ..
Latitude: 3.'1
Longitude: 7846'43"
Stream Class: WS-1V;NSW;CA
Hydrological Unit: 03-04-01
• •