NC0061638_Draft Permit_20230516

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Mr. Tony Konsul
Carolina Water Service of NC, Inc.
4944 Parkway Plaza Blvd, Suite 375
Charlotte, NC 28217
Dear Permittee:
r. STAIT r
o..'i ` lbw
3Y y
NORTH CAROLINA
Environmental Quality
May 16, 2023
Subject: Draft NPDES Permit NCO061638
Amherst WWTP
Grade WW-2 Biological WPCS
Wake 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:
➢ A reopener condition for the Neuse River has been added at Part I. A. (4).
➢ Electronic data submission requirements have been updated.
Middle Creek is listed as an impaired stream on North Carolina's 303 (d) list. Currently, the stream
does not meet all water quality standards. If the limitations in the current permits for facilities
discharging to Middle Creek do not result in improved water quality, removal of discharges may be
necessary for the health of the stream.
We will continue to monitor compliance at your facility. If noncompliance with your permit's effluent
limits is shown to be a direct cause of stream degradation, the Division will reconinend removal of your
facility's discharge.
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 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.
-y� North Carolina Department of Environmental Quality I Division of Water Resources
D E Q J� 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
o.Prmieia e..wu.M�Ui a,s�
919.707.9000

Page 2 of 2
NPDES Permit NCO061638
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.weaverAncdenr.gov.
Sincerely,
Environmental Specialist II
NPDES Compliance and Expedited Permitting

Permit NCO061638
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 provision 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,
Carolina Water Service, Inc. of NC
is hereby authorized to discharge wastewater from a facility located at the
Amherst WWTP
4917 Johnston Pond Road
Apex
Wake County
to receiving waters designated as Middle Creek in sub -basin 03-04-03 of the Neuse River Basin in accordance
with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, I1, III, and IV hereof.
This permit shall become effective
This permit and authorization to discharge shall expire at midnight on April 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 November 2, 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 NC0061638
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.
Carolina Water Service, Inc. of NC is hereby authorized to:
Continue to operate an existing 0.046 MGD wastewater treatment system which includes the following
components:
➢ Influent pump station
➢ Surge Tank [10,000 gallons]
➢ Dual Sludge Digesters [5,000 gallons each]
➢ Effluent recording flow measurement
➢ Post Aeration
➢ Bar screen
➢ Dual train aeration basins [12 at 5,000 gallons each]
Dual clarifiers [6,200 gallons each]
Tertiary filter
➢ Dual hypochlorinator
➢ Dechlorinator
The facility is located south of Raleigh at the Amherst WWTP (4917 Johnston Pond Road, Apex) in
Wake County.
2. After receiving an Authorization to Construct permit from the Division, increase treatment capacity to
0.053 MGD.
3. Discharge from said treatment works at the location specified on the attached map into Middle Creek,
currently classified C-NSW waters in hydrologic unit 03020201 of the Neuse River Basin.
Page 2 of 9

Permit NCO061638
Part I
Grade WW-2 Water Pollution Control System [15A NCAC 08G.0302]
A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — 0.046 MGD
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expansion above 0.046
MGD or expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited
and monitored' by the Permittee as specified below:
PARAMETER
Parameter Code]
LIMITS
MONITORING REQUIREMENTS
Monthly Average
Daily Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
[500501
0.046 MGD
Continuous
Recording
Influent or
Effluent
Total Monthly Flow
82220
Monitor & Report
Monthly
Calculated
Influent or
Effluent
BOD, 5-day (20°C) [00310]
(April 1 — October 31
5.0 mg/L
7.5 mg/L
Weekly
Composite
Effluent
BOD, 5-day (20°C) [00310]
November 1— March 31
10.0 mg/L
15.0 mg/L
Weekly
Composite
Effluent
Total Suspended Solids 00530
30.0 m /L
45.0 m /L
Weekly
Composite
Effluent
NH3 as N [00610]
(April 1 — October 31
2.0 mg/L
10.0 mg/L
Weekly
Composite
Effluent
NH3 as N [00610]
November 1 — March 31
4.0 mg/L
20.0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen [003001
Dailv avera e > 5.0 m /L
Weekly
Grab
Effluent
Dissolved Oxy en [003001
Weekly
Grab
U & D
Fecal Coliform [31616]
(geometric mean
200 / 100 ml
400 / 100 ml
Weekly
Grab
Effluent
Total Residual Chlorine2 50060
28 /L
2/Week
Grab
Effluent
Temperature °C) [000101
Daily
Grab
Effluent
Temperature °C 00010
Weekly
Grab
U & D
TKN m /L) [006251
Monitor & Report
2/Month
Composite
Effluent
NO2-N + NO3-N m /L) [006301
Monitor & Report
2/Month
Composite
Effluent
Total Nitrogen m /L 3 [006001
Monitor & Report
2/Month
Composite
Effluent
Total Nitrogen Load4 [00600]
Monitor & Report (pounds/month)
Monitor & Report (pounds/year
Monthly
Annually
Calculated
Calculated
Effluent
Effluent
Total Phosphorus m /L 00665
Monitor & Report
2/Month
Composite
Effluent
H 00400
> 6.0 and < 9.0 standard units
Weekly
Grab
Effluent
Footnotes:
1. U: Upstream from the outfall. D: downstream from the outfall.
2. The facility shall report all effluent TRC values reported by a NC certified laboratory (including field certified
laboratories). However effluent values < 50 µg/L will be treated as zero for compliance purposes.
3. For a given wastewater sample, TN = TKN + NO2-N + NO3-N, where TN is Total Nitrogen and TKN is Total Kjeldahl
Nitrogen.
4. TN Load is the mass load of Total Nitrogen discharged in a given period of time [see A. (3)]. Compliance with this limit
shall be determined in accordance with A. (4).
5. The Permittee shall submit discharge monitoring reports electronically using the Division's eDMR system [see A. (6.)].
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 3 of 9

Permit NCO061638
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — 0.053 MGD
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon expansion to 0.053 MGD and lasting until expiration, the Petmittee is
authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as
specified below:
PARAMETER
Parameter Code
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
50050
0.053 MGD
Continuous
Recording
Influent or
Effluent
Total Monthly Flow
82220
Monitor & Report
Monthly
Calculated
Influent or
Effluent
BOD, 5-day (20°C) [00310]
(April 1 — October 31
5.0 mg/L
7.5 mg/L
Weekly
Composite
Effluent
BOD, 5-day (20°C) [00310]
November 1 — March 31
10.0 mg/L
15.0 mg/L
Weekly
Composite
Effluent
Total Suspended Solids 00530
30.0 m /L
45.0 m /L
Weekly
Composite
Effluent
NH3 as N [00610]
(April 1— October 31
2.0 mg/L
10.0 mg/L
Weekly
Composite
Effluent
NH3 as N [00610]
November 1— March 31
4.0 mg/L
20.0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen 00300
Daily average > 5.0 m /L
Weekly
Grab
Effluent
Dissolved Oxygen 00300
Weekly
Crab
U & D
Fecal Coliform [31616]
(geometric mean
200 1100 ml
400 / 100 ml
Weekly
Grab
Effluent
Total Residual Chlorine2 50060
28 /L
2/Week
Grab
Effluent
Temperature °C) [000101
Daily
Grab
Effluent
Temperature °C) [000101
Weekly
Grab
U & D
TKN m /L 00625
Monitor & Report
2/Month
Composite
Effluent
NO2-N + NO3-N m /L 00630
Monitor & Report
2/Month
Composite
Effluent
Total Nitrogen m /L 3 [006001
Monitor & Report
2/Month
Composite
Effluent
Total Nitrogen Load4 [00600]
Monitor & Report (pounds/month)
1,072 pounds/year
Monthly
Annually
Calculated
Calculated
Effluent
Effluent
Total Phosphorus m /L 00665
1.0 m /L I
2/Month
Composite
Effluent
H 00400
> 6.0 and < 9.0 standard units
Weekly
Grab
Effluent
Footnotes:
1. U: Upstream from the outfall. D: downstream from the outfall.
2. The facility shall report all effluent TRC values reported by a NC certified laboratory (including field certified
laboratories). However effluent values < 50 µg/L will be treated as zero for compliance purposes.
3. For a given wastewater sample, TN = TKN + NO2-N + NO3-N, where TN is Total Nitrogen and TKN is Total Kjeldahl
Nitrogen.
4. TN Load is the mass load of Total Nitrogen discharged in a given period of time. See special condition A. (3.),
Calculation of TN Loads. Compliance with this limit shall be determined in accordance with special condition A. (4.) of
this permit, Compliance with Annual Limits for Total Nitrogen.
5. The Permittee shall submit discharge monitoring reports electronically using the Division's eDMR system [see A. (6.)].
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 9

Permit NCO061638
A. (3.) CALCULATION OF TOTAL NITROGEN (TN) 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 = average Total Nitrogen concentration (mg/L) of the composite samples collected
during the month
TMF = Total Monthly Flow of wastewater discharged during the month (MG/mo.)
8.34 = conversion factor, from (mg/L x MG) to pounds
H. Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loads 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. (4.) ANNUAL LINIITS FOR TOTAL NITROGEN
[G.S. 143-215.1(b)]
(a) Total Nitrogen (TN) limits for NPDES dischargers in the Neuse River basin are as prescribed in
the basin's Nutrient Management Strategy rule for wastewater treatment facilities, T15A NCAC
2B .0234.
(b) The Permittee's TN discharge is governed by this Permit unless the Permittee is a member and
co-permittee of an approved compliance association, in which case its TN discharge is governed
by the association's group NPDES permit and the limits therein.
(c) TN limits for NPDES dischargers in the Neuse River basin are annual, calendar -year limits. All
such limits in effect on January 1 of a given year remain in effect for the entire calendar year.
Changes in TN limits become effective on January 1 of the year following permit modification
and remain in effect for the full year. Similarly, changes in membership in a compliance
association become effective on January 1 of the year following the change and remain in effect
for the full year.
(d) For any given calendar year, the Permittee shall be in compliance with the annual TN Load limit
in this Permit if: - - -
-` - (1) the Permittee's annual TN'Load is less than or equal to said limit, or
(2) the Permittee is a Member of a compliance association and a Co-Permittee to the
association's group NPDES permit.
(e) The Permittee's effective TN limit (if any) may change due to changes in its TN allocation or
membership changes in a compliance association.
(1) The Permittee may notify the Division and request a modification of this Permit to
incorporate allowable changes in its TN Load limit. 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.
(2) If the Permittee intends to join or leave a compliance association, the Division must be
notified of the proposed change.
(3) Upon receipt of timely and proper notification, the Division will modify the affected
permit(s) as necessary to incorporate the allowable changes in TN limits or to reflect the
change in membership.
a. The Division must receive notification no later than August 31 for changes proposed
for the following calendar year.
Page 5 of 9

Permit NCO061638
b. Notification shall be sent to:
NCDEQ/DWR/NPDES
Attn: Neuse River Basin Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617
(f) For the purpose of permit compliance, an association's Co-Permittee Members in a calendar year
(and the Permittee's membership status) shall be as defined in its group NPDES permit. The
roster and the members' TN allocations will be updated annually and in accordance with state and
federal program requirements.
(g) 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. (5.) 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 (T15A
NCAC 02B .0713) 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 (1)
STATUS
ALLOCATION
SOURCE
DATE
TYPE
Estuary Discharge
(pounds/year) (pounds/year)
Base
Assigned by Rule
12/7/1997;
536
1072
Active
(T15A NCAC 02B
4/1/2003
.0713)
TOTAL
536
1072
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. (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 require that conditions for total nitrogen and total phosphorus control be imposed on this
permit.
Page 6 of 9

Permit NCO061638
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 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.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
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:Hdeg.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.
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Permit NC0061638
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 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.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 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
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Permit NCO061638
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:
hILtp:Hdeg.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. 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.)l
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 9 of 9