NC0058505_Draft Permit_20230516

STATE w
ROY COOPER
Governor
ELIZABETH S. BISERe1.
Secretary
RICHARD E. ROGERS, JR. NORTH CAROLINA
Director Environmental Quality
May 16, 2023
Ms. Amanda Berger
Aqua North Carolina
202 MacKenan Drive
Cary, NC 27511
Subject: Draft NPDES Permit NCO058505
Mallard Crossing WWTP
Grade WW-2 Biological WPCS
Wake 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:
➢ A reopener condition for permits in the Neuse River basin has been added at Part I. A. (7.).
➢ Electronic data submission requirements have been updated.
The NPDES standard conditions (Parts U, 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 h11ps://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 Wake 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 charles.weaveraa,ncdenr.gov.
S noerel y,
Errvironmerrtal SpecialSt 11
NPDES Compliance and Expedited Permitting
North Carolina Department of Environmental Quality I Division of Water Resources
D E Q�� 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
JTH INA
WrmYamrnbi
919.707.9000
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Permit NCO058505
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
DES
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
Mallard Crossing WWTP
Old Milburnie Road (NCSR 2217) north of Knightdale
Wake County
to receiving waters designated as an unnamed tributary to Hodges Mill Creek in the Neuse River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, I1I, and
IV hereof.
This permit shall become effective.
This permit and authorization to discharge shall expire at midnight on March 31, 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 October 3, 2027 (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 9

Permit NCO058505
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and 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:
Continue to operate an existing 0.100 MGD wastewater treatment system that includes the following
components:
One influent lift station
One 0.050 MGD extended aeration plant with:
➢ Aeration tank
➢ Sludge holding tank
➢ Dual hopper clarifiers
➢ Diffused post -aeration
➢ Dual blowers
One 0.050 MGD extended aeration plant with:
➢ Aeration tank
➢ Equalizations basin with 150 CFM blower
➢ Sludge holding tank
➢ Phosphorus reduction system
➢ Clarifier
➢ Post -aeration
➢ Dual blowers
➢ Ultraviolet disinfection
The facility is located north of Knightdale at the Mallards Crossing Subdivision WWTP on NCSR 2217 in
Wake County.
2. Continue to introduce ion exchange WTP wastewater and greensand filter WTP backwash wastewater at
maximum of 1,000 gallons per day to the headworks via the manual drip system.
3. Discharge from said treatment works via Outfall 001, at the location specified on the attached map into an
unnamed tributary to Hodges Mill Creek, [stream segment 27-26-1-(2)], a waterbody classified C; NSW waters
within sub -basin 03-04-02 [HUC: 03020201] in the Neuse River Basin.
Page 2 of 9

Permit NCO058505
Part I
Grade WW-2 Water Pollution Control System [15A NCAC 08G.0302]
A. (I.) 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 treat domestic wastewater in combination with up to 1,000 gpd of ion exchange WTP wastewater and
greensand filter WTP backwash wastewater, and to discharge treated wastewater from Outfall 001. Such
discharges shall be limited, monitored and reported' by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
Parameter Code
LIMITS
MONITORING
REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow (MGD)
50050
0.1 MGD
Continuous
Recording 2
Effluent
Total Monthly Flow (TMF) (MG/Month)
82220
Monitor & Report
Monthly
Calculated 2
Effluent
BOD, 5-day (200C) (mg/L)
C0310
30.0 mg/L
45.0 mg/L
Weekly
Composite
Effluent
Total Suspended Solids (TSS)
C0530
30.0 mg/L
45.0 mg/L
Weekly
Composite
Effluent
NH3 as N (mg/L)
(April 1— October 31
C0610
2.0 mg/L
10.0 mg/L
Weekly
Composite
Effluent
NH3 as N (mg/L)
November 1— March 31
C0610
4.0 mg/L
20.0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen (DO)
00300
Daily average not < 5.0 mg/L
Weekly
Grab
Effluent
Temperature (°C)
00010
Daily
Grab
Effluent
Fecal Coliform (#/100m1) 4
31616
200 / 100 ml
400 / 100 ml
Weekly
Grab
Effluent
Total Residual Chlorine (TRC) s (Ng/L)
50060
25 pg/L
2/Week
Grab
Effluent
Dissolved Oxygen (DO) (mg/L)
00300
Weekly
Grab
U & D 8
Temperature (°C)
00010
Weekly
Grab
U & D 6
Total Kjeldahl Nitrogen (TKN) I (mg/L)
00625
Monitor & Report
2/Month
Composite
Effluent
Nitrite/Nitrate Nitrogen 7 (mg/L)
00630
Monitor & Report
2/Month
Composite
Effluent
Total Nitrogen (TN) 7 (mg/L)
C0600
Monitor & Report
2/Month
Calculated
Effluent
TN Load 3,' (pounds/month)
(pounds/year)
QM600
QY600
Monitor & Report
Monthly
Calculated
Effluent
Monitor & Report
Annually
Calculated
Effluent
Total Phosphorus (TP) 8
C0665
2.0 mg/L (quarterly average)
2/Month
Composite
Effluent
pH
00400
> 6.0 and < 9.0 standard units
Weekly
Grab
Effluent
Combined radium-226 and radium-228 9,10
11503
5 pCi/L (annual average)
Quarterly
Grab
Effluent
Alpha emitters, excluding radon
and uranium 9,10
82077
15 pCi/L (annual average)
Quarterly
Grab
Effluent
Beta emitters, excluding potassium-40 and
other naturally occurring radionuclides 9,10
Ci/L
03520
50 pCi/L (annual average)
Quarterly
Grab
Effluent
Strontium-90 9,10
13501
8 pCi/L (annual average)
Quarterly
Grab
Effluent
Tritium 9,10
82126
20,000 pCi/L (annual average)
Quarterly
Grab
Effluent
Uranium 9,11
22708
30 pg/L (weekly average)
Quarterly
Grab
Effluent
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system [see
A. (8.)].
Page 3 of 9

Permit NCO058505
2. The daily flow is measured by two recorders, one on each unit, added together and reported on the discharge monitoring
report (DMR). A calculated monthly average of the reported daily rate based only on the days a flow is reported on the
DMR. The summation of the reported daily flows in a given month (TMF) is reported on the DMR.
3. TN Load is the mass load of Total Nitrogen discharged in a given period of time [see condition A. (2.)]. Compliance with
this permit's nutrient allocation shall be determined in accordance with conditions A. (3.) and A. (4.).
4. Fecal Coliform shall be calculated using the geometric mean, according to the procedure detailed in Part I1. Section A.
5. Limit and monitoring requirements for TRC apply only if chlorine or a chlorine derivative is added to the waste stream
during the treatment process. See A. (5.) for instructions should the facility's UV system fail and an alternate means of
disinfection is required. When chlorine or a chlorine derivative are added the facility shall report all effluent TRC values
reported by a NC certified laboratory including field certified. However, effluent values below 50 µg/L will be treated as
zero for compliance purposes.
6. Upstream = at least 100 feet upstream from the outfall. Downstream = 0.3 mile downstream from the outfall.
7. For a given wastewater sample, TN = TKN + (NO2-N + NO3-N), where TN is Total Nitrogen and TKN is Total Kjeldahl
Nitrogen, and (NO2-N + NO3-N) is Nitrite/Nitrate Nitrogen.
8. The quarterly average for total phosphorus shall be the average of all composite samples collected twice a month for each
calendar quarter (January -March, April -June, July -September, October -December).
9. All quarterly samples shall be taken 72 to 80 hours after the introduction of offsite wastewater into the equalization tank.
10. If the quarterly value exceeds 4 times the annual average limit then (a) the sampling frequency shall increase to monthly
and (b) a written notification shall be sent to the NPDES Permitting Section and the Raleigh Regional Office.
11. A quarterly value can be determined from one quarterly sample or it can be determined from the average of multiple
samples taken in a period not to exceed 7 consecutive days during the quarter.
Conditions:
• All samples collected should be from a representative discharge event.
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) CALCULATION OF TOTAL NITROGEN LOADS
[NCGS 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 = average TN concentration (mg/L) of the composite samples collected during the
month
TMF = Total Monthly Flow of wastewater discharged during the month (MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
I Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loadi for the calendar year
b. The Permittee shall report monthly Total Nitrogen results (mg/L and pounds/month) in the discharge
monitoring report for that month and shall report each year's annual results (pounds/year) in the
December report for that year.
A. (3.) ANNUAL LIMITS FOR TOTAL NITROGEN
[NCGS 143-215.1(b)]
a. Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the Neuse River basin
are annual limits and are applied for the calendar year.
b. For any given calendar year, the Permittee shall be in compliance with the annual TN Load limit in this
Permit if:
i. the Permittee's annual TN Load is less than or equal to said limit, or
ii. the Permittee is a Co-Permittee Member of a compliance association.
Page 4 of 9

Permit NC0058505
c. 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
d. 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.
(1) Upon receipt of timely and proper notification, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(2) Membership changes in a compliance association become effective on January 1 of the year
following modification of the association's permit.
e. 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.
A. (4.) TOTAL NITROGEN ALLOCATIONS
[NCGS 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 (T15A NCAC 02B .0713) and the
status of each as of permit issuance. The allocations listed here do not constitute a discharge limit; any such
limit is as established in the Effluent Limitations and Monitoring Requirements of this permit. 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.
Page 5 of 9

Permit NCO058505
ALLOCATION AMOUNT (1)
ALLOCATION
TYPE
SOURCE
DATE
STATUS
Estuary
Discharge
(pounds/year)
(pounds/year)
Base
Assigned by Rule
12/7/1997;
1,011
2,022
Active
(T15A NCAC 02B .0713)
4/1/2003
TOTAL
1,011
2,022
Active
Footnote:
(1) Transport Factor = 50%
b. Any addition, deletion, or modification of the listed allocation(s) (other than to correct typographical errors) or
any change in status of any of the listed allocations 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.) TEMPORARY MEANS OF DISINFECTION
[NCGS 143-215.1(a)]
In the event that the wastewater treatment plant's ultraviolet (UV) disinfection system should fail, underperform, or
otherwise be removed from effective service, the penmittee or his agent should immediately inform the NC DEQ
Raleigh Regional Office of this development and discuss temporary, alternate means for disinfection of the effluent.
If chlorine compounds are used as 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 TRC values must be reported
on the discharge monitoring report. TRC in the effluent may not exceed the permit limit; therefore, dechlorination
methods may also be necessary to ensure protection of water quality in the receiving stream.
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.
A. (6.) REOPENER CLAUSE FOR RADIOLOGICAL PARAMETERS
[NCGS 143-215.1(b)]
The Division may reopen this permit to increase monitoring, add additional parameters of concern, and/or -
implement additional limits should effluent data or surface water data indicate potential impacts, or should further
information on radiological components become available.
A. (7.) 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 Il, Sections B.12 and 13.13. 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 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.
Page 6 of 9

Permit NCO058505
A. (8.) 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. Reportine 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.
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.
Page 7 of 9

Permit NCO058505
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-discharp-e-elimination-system-nodes-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 Reportina
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://deg.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) M and Supersedes Section B. (11.) (d)l
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:
Page 8 of 9

Permit NCO058505
http://deg.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:
7 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. I am
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.)]
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 122.411.
Page 9 of 9

JIN
v �N
Six Fork
k It
C,rossrc'ai1
.f
Outfall 001
14
Imo.., Y
100 .,
Aqua North Carolina, Inc.
Mallards Crossing WWTP
Receiving Stream: Neuse River
Latitude: 352 50' 58" N Stream Class: C, NSW
Longitude: 782 29' 45" W Sub -basin: 03-04-02
I'D
!S
I
Facility
Location
(not to scale)
NPDES Permit NC0058505
TNotth Wake County