NC0088846_Draft Permit_20230426

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR,
Director
Mr. Damon Forney, Plant Manager
Town of Cary
PO Box 8005
Cary, North Carolina 27512
Dear Mr. Forney:
NORTH CAROLINA
Environmental Quality
April 26, 2023
Subject: Draft NPDES Permit Renewal
Permit NCO088846
Western Wake Regional WRF
Wake County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• To verify that the existing sample location is representative of the monitored activity, Special
Condition A. (7.) Demonstration of Representative Sampling has been added to the permit.
• Some of the wording has changed in Special Condition A. (5.), Chronic Toxicity Permit Limit,
please review each paragraph carefully.
• Special Condition A. (6.) has been modified to include the specific three years in which the
Effluent Pollutant Scan shall be performed (2025, 2026, and 2027). In addition, at the end of
the Special Condition, 2°a species Toxicity Testing Requirements for municipal permit
renewals per Federal Regulations [40 CFR 122.210)(5)] have been added.
• As the facility identified the presence of 1,4-Dioxane in their influent during the 2019
investigation for emerging compounds in the Cape Fear River Basin, monthly monitoring for
1,4-Dioxane as well as a 1,4-Dioxane reopener condition have been added to the permit [See
A.(L) and A.(2.) and Special Condition A.(8.)].
• A special condition to monitor effluent PFAS chemicals quarterly has been added to the permit,
to be effective six (6) months after EPA has a final wastewater method in 40 CFR136 method
published in the Federal Register [See Special Condition A. (10.) PFAS Monitoring
Requirements] .
• A notation was made concerning the Electronic Reporting Rule — NPDES Electronic
Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21,
2025.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and program reports. The requirement to continue reporting discharge monitoring data
NORTH CAROLINAD_ E Q
Department of Emlmnmenfal Deali�
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet
application has been added to your NPDES permit [See Special Condition A. (12.)].
The map was modified to show the instream monitoring locations in relation to the facility and
Outfall.
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.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Wake County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after
receipt of 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 this draft
permit, please call me at [phone] or by email at [e-mail].
Sincerely,
DocuSigned,b�y:,• -,� '^
P�I'l.1 Leff
9FBBBC952DF8455...
Gary Perlmutter, Environmental Specialist II
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR/Raleigh Regional Office/Water Quality/Scott Vinson
DWR/Operator Certification Program/Maureen Kinney
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Cindy Moore
DWR/Municipal Permitting Unit/Keyes McGee
DWR / Basin Planning / Nora Deamer
DWR/Public Water Supply / Shawn Guyer
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.707.9000
Depanmem of Envlmnmenml Dual

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
TATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
N( PDES)
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, the
Town of Cary
are hereby authorized to discharge wastewater from a facility located at the
Western Wake Regional Water Reclamation Facility
serving the Town of Cary and the Town of Apex
3500 Reclamation Road
New Hill, NC
Wake County
to receiving waters designated as Cape Fear River below Buckhorn Dam in the Cape Fear River Basin in
accordance with the effluent limitations, monitoring requirements, and other applicable conditions set
forth in Parts I, II, III, and IV hereof.
This permit shall become effective Month 1, 2023.
This permit and authorization to discharge shall expire at midnight on July 31, 2028.
Signed this day Month dd, 2023.
DRAFT
for Richard E. Rogers, Jr., Director
Division of Water Resources
By Authority of the Environmental Management
Commission
Page 1 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
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 Cary and Town of Apex
are hereby authorized to:
1. Continue to operate and maintain the Western Wake Regional Water Reclamation Facility identified
on the Cover, an existing 18.0 MGD facility consisting of the following components:
• Two mechanical screens and one manual screen
• Influent flow meter
• Vortex grit separator
• Dual grit cyclones and classifiers
• Splitter box
• Biological Reactor Basins divided into four trains, with jet aeration
• Eight secondary clarifiers
• Tertiary cloth disk filters
• Ultraviolet disinfection
• Effluent flow meter
• Post -aeration
• Effluent pump station and force main to Cape Fear River
• Scum collection and digestion
• Biosolids treatment consisting of three combination gravity belt thickener and belt filter press and
two thermal biosolids belt dryer
• Liquid solid loading and receiving station
• Cake solids loading and receiving station
• Two cake storage silos
• Two dry pellets storage silos
• Standby electrical generation
2. Upon receipt of an Authorization to Construct from the Division of Water Resources, construct an
expanded facility with capacity of 30.0 MGD (Phase 2);
3. Upon submitting an Engineer' s Certificate form for the completed expansion, operate said treatment
works at 30.0 MGD; and
4. Discharge from said treatment works at the location specified on the attached map via Outfall 001 into
Cape Fear River, classified WS-V waters in the Cape Fear River Basin and 03030004 HUC.
Page 2 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
PART
A.(13.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (18.0 MGD)
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until expansion to 30.0
MGD or permit expiration, whichever is sooner, the Permittee is authorized to discharge treated
municipal and industrial wastewater from Outfall 001. Such discharges shall be limited and
monitored 1 by the Permittee as specified below:
EFFLUENT LIMITS
MONITORING REQUIREMENTS
PARAMETER
Monthly
Weekly
Daily
Measurement
Sample
Sample
Parameter Code
Average
Average
Maximum
Frequency
Type
Location
Flow 50050
18.0 MGD
Continuous
Recording
Influent or
Effluent
Total Monthly Flow, MG 51500
Monitor and Report
Monthly
Recording
Influent or
Effluent
BOD, 5-day, 20°C2
C0310
5.0 mg/L
7.5 mg/L
2/week 3
Composite
Influent &
(Apr 1 - Oct 31)
Effluent
BOD, 5-day, 20°C2
C0310
10.0 mg/L
15.0 mg/L
2/week 3
Composite
Influent &
(Nov 1 - Mar 31)
Effluent
Total Suspended Solids (TSS) 2 C0530
30.0 mg/L
45.0 mg/L
2/week'
Composite
Influent &
Effluent
Ammonia (NH3 as N)
C0610
1.0 mg/L
3.0 mg/L
2/week 3
Composite
Effluent
(Apr 1 - Oct 31)
Ammonia (NH3 as N)
C0610
2.0 mg/L
6.0 mg/L
2/week 3
Composite
Effluent
(Nov 1 - Mar 31)
Dissolved Oxygen (DO) 00300
Daily Average > 6.0 mg/L
Daily
Grab
Effluent
pH 00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Fecal Coliform 31616
200/100 mL
400/100 mL
2/week'
Grab
Effluent
(geometric mean)
Temperature, °C 00010
Monitor and Report
Daily
Grab
Effluent
Total Residual Chlorine 4 50060
1 1 28 µg/L
Daily
Grab
Effluent
Conductivity, µmhos/cm 00094
Monitor and Report
Daily
Grab
Effluent
Total Kjeldahl Nitrogen (TKN), 00625
Monitor and Report
Weekly
Composite
Effluent
mg/L
Nitrate -Nitrite Nitrogen
00630
Monitor and Report
Weekly
Composite
Effluent
(NO3-N + NO2-N), mg/L
Total Nitrogen (TN)'
(Apr 1 - Oct 31) C0600
5.0 mg/L
Weekly
Calculated
Effluent
Total Phosphorus (TP)
C0665
0.75 mg/L
Weekly
Composite
Effluent
(Apr 1 - Oct 31)
TN Load (Apr 1 — Oct 31) QM600
Monitor and Report (lb/mo)
Monthly
Calculated
Effluent
QS600
112,4001bs/season
Seasonally
TP Load (Apr 1 — Oct 31) QM665
Monitor and Report (lb/mo)
Monthly
Calculated
Effluent
QS665
16,100 lbs/season
Seasonally
Total Hardness' (as CaCO3),
00900
mg/L
Monitor and Report
Quarterly
Composite
Effluent
Chronic Toxicity' TGP3B
Monitor and Report
Quarterly
Composite
Effluent
Page 3 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
1,4-Dioxane 8 82388
Monitor and Report
Monthly
Grab
Effluent
PFAS, ng/L various
Footnote 9
Quarterly
Grab
Effluent
Effluent Pollutant Scan NC01
Monitor and Report
Footnote 10
Footnote 10
Effluent
Footnotes.
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (10.).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. Twice per week sampling must occur on any two non-consecutive days during the calendar week.
4. The facility shall monitor TRC if using chlorination for disinfection. The Division shall consider all effluent total
residual chlorine 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.
5. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, and NO3-N and NO2-N are
Nitrate and Nitrite Nitrogen, respectively.
6. Hardness sampling shall coincide with sampling of metals.
7. Chronic Toxicity (Ceriodaphnia dubia) Pass/Fail at 7.4% effluent with testing in February, May, August and
November. See Special Condition A. (5.).
8. Samples shall be reported to a minimum of PQL < 1 µg/L using an appropriate 40 CFR Part 136 method.
9. Follow Special Condition A. (9.).
10. The Permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A. (6.).
(a.) There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A.(14.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (30.0 MGD)
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
(a.) During the period beginning on expansion to 30.0 MGD and lasting until permit expiration, the
Permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001.
Such discharges shall be limited and monitored' by the Permittee as specified below:
EFFLUENT LIMITS
MONITORING REQUIREMENTS
PARAMETER
Monthly
Weekly
Daily
Measurement
Sample
Sample
Parameter Code
Average
Average
Maximum
Frequency
Type
Location
Flow 50050
30.0 MGD
Continuous
Recording
Influent or
Effluent
Total Monthly Flow, MG
Monitor and Report
Calculated
Recording
Influent or
Effluent
BOD, 5-day, 20°CZ
Influent &
(Apr 1 - Oct 31) C0310
5.0 mg/L
7.5 mg/L
Daily
Composite
Effluent
BOD, 5-day, 20°C2
Influent &
C0310
(Nov 1 - Mar 31)
10.0 mg/L
15.0 mg/L
Daily
Composite
Effluent
Total Suspended Solids (TSS) 2 C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent &
Effluent
Ammonia (NH3 as N)
C0610
1.0 mg/L
3.0 mg/L
Daily
Composite
Effluent
(Apr 1 - Oct 31)
Ammonia (NH3 as N)
C0610
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
(Nov 1 - Mar 31)
Dissolved Oxygen (DO) 00300
Daily Average > 6.0 mg/L
Daily
Grab
Effluent
pH 00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Fecal Coliform
31616
200/100 mL
400/100 mL
Daily
Grab
Effluent
(geometric mean)
Temperature, °C 00010
Monitor and Report
Daily
Grab
Effluent
Total Residual Chlorine 3 50060
28 µg/L
Daily
Grab
Effluent
Conductivity, µmhos/cm 00094
Monitor and Report
Daily
Grab
Effluent
Total Kjeldahl Nitrogen (TKN), 00625
Monitor and Report
Weekly
Composite
Effluent
mg/L
Nitrate -Nitrite Nitrogen
00630
Monitor and Report
Weekly
Composite
Effluent
(NO3-N + NO2-N), mg/L
Total Nitrogen 4
C0600
5.0 mg/L
Weekly
Calculated
Effluent
(Apr 1 - Oct 31)
Total Phosphorus
C0665
0.75 mg/L
Weekly
Composite
Effluent
(Apr 1 - Oct 31)
QM600
Monitor and Report (lb/mo)
Monthly
TN Load (Apr 1 — Oct 31)
Calculated
Effluent
QS600
112,400 lbs/season
Seasonally
TP Load (Apr 1 — Oct 31) QM665
Monitor and Report (lb/mo)
Monthly
Calculated
Effluent
QS665
16,100 lbs/season
Seasonally
Total Hardness (as CaCO3) 5,
00900
mg/L
Monitor and Report
Quarterly
Composite
Effluent
Chronic Toxicity TGP3B
Monitor and Report
Quarterly
Composite
Effluent
1,4-Dioxane ' 82388
Monitor and Report
Monthly
Grab
Efluent
PFAS, ng/L various
Footnote 8
Quarterly
Grab
Effluent
Effluent Pollutant Scan NCO]
Monitor and Report
Footnote 9
Footnote 9
Effluent
Page 5 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
Footnotes.
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (10.).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. The facility shall monitor TRC if using chlorination for disinfection. The Division shall consider all effluent total
residual chlorine 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.
4. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, and NO3-N and NO2-N are
Nitrate and Nitrite Nitrogen, respectively.
5. Hardness sampling shall coincide with sampling of metals.
6. Chronic Toxicity (Ceriodaphnia dubia) Pass/Fail at 12.0% effluent with testing in February, May, August and
November. See See Special Condition A. (5.).
7. Samples shall be reported to a minimum of PQL < 1 µg/L using an appropriate 40 CFR Part 136 method.
8. Follow Special Condition A. (9.).
9. The Permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A. (6.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 6 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A.(15.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B .0200 et seq.]
Beginning on the effective date of this permit and lasting until the expiration date, the Permittee shall
perform instream sampling upstream and downstream of Outfall 001 as specified below:
Parameters
Measurement Frequency
Sample Type
Sample 1
Location
Total Hardness (as CaCO3), mg/L
Quarterly
Grab
U
Dissolved Oxygen (DO), mg/L
Footnote 2
Grab
U, D
Temperature, °C
Footnote 2
Grab
U, D
Conductivity, µmhos/cm
Footnote 2
Grab
U, D
pH, SU
Footnote 2
Grab
U, D
Ammonia, mg/L
Footnote 2
Grab
U, D
TKN, mg/L
Footnote 3
Grab
U, D
NO2+NO3, mg/L
Footnote 3
Grab
U, D
Total Phosphorus, mg/L
Footnote 3
Grab
U, D
Footnote.
1. U = directly upstream of Buckhorn Dam; D = downstream approximately 2 miles below the outfall.
2. Stream samples shall be collected three times per week during the summer months (April through October),
and weekly during the remainder of the year.
3. Samples shall be collected three times per week during April through October only.
Instream monitoring requirements shall be provisionally waived so long as the Permittee is a member of the Middle
Cape Fear Basin Association, Inc. (MCFBA) and the Association continues to function as approved by the Division
and the Environmental Management Commission. If these two conditions are not met, the instream monitoring
requirements in this permit become effective immediately.
A (4.) CALCULATION OF MASS LOADS [G.S. 143-215.1(b)]
a. The Permittee shall calculate monthly and seasonal TN (and TP) loads as follows:
i. Monthly TN (or TP) Load (pounds/month) = TN (or TP) x TMF x 8.34
where:
TN (or TP) = the average Total Nitrogen (or Total Phosphorus) concentration
(mg/L) of the daily composite samples collected during the month
TMF = the total daily volume of wastewater discharged during the month
(MG/mo)
8.34 = conversion factor, from (mg/L x MG) to pounds
ii. Seasonal TN (or TP) load (pounds/season) = Sum of the monthly TN (or TP) loads for
the season, April 1 — October 31.
b. The Permittee shall report the Total Nitrogen and Total Phosphorus concentrations for each
sample and the monthly mass loadings in the appropriate discharge monitoring report for each
month and shall report each season's results (pounds/season from April 1 through October 31)
with the October discharge monitoring report for that year.
Page 7 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A.(5.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) —18.0 MGD AND 30.0 MGD
[15A NCAC 02B .0200] [15A NCAC 02B .0500 et seq]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 7.4% at 18.0 MGD (phase 1) and 12.0% at 30.0
MGD (phase 2).
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," (Revised December 2010, or
subsequent versions) or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised December 2010, or subsequent versions). The tests will be performed during the months of
February May, August and November. These months signify the first month of each three-month toxicity
testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below
the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the
two following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -December 2010, or subsequent versions).
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed, using the parameter code TGP313
for the pass/fail results and THP313 for the Chronic Value. Additionally, DWR Form AT-3 (original) is to
be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Or, results can be sent to the email, ATForms.ATB(ae,ncdenr.gov.
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Water
Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Page 8 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the
last day of the month following the month of the initial monitoring.
Page 9 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A.(6.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[NCGS 143-215.1(b)]
(a.) Effluent Pollutant Scans.
The Permittee
shall perform a total of three (3) Effluent
Pollutant Scans for all
parameters listed below. For the 18.0
MGD flow tier, one scan must
be performed
in each of the following
years: 2025, 2026, and 2027. For the 30.0 MGD flow tier, the Permittee shall perform three effluent pollution
scans in the three following
years after expansion is in effect. Analytical
methods
shall be in accordance with
40 CFR Part 136 and shall
be sufficiently sensitive to determine whether
parameters are present in
concentrations greater than
applicable standards and criteria. Each annual
sample shall coincide with one
quarterly toxicity test each year [see Condition A. (3)] and each must be
collected in a different calendar quarter
to represent seasonal variation
[i.e., do
not sample in the same quarter every year].
Unless otherwise indicated,
metals shall be analyzed as
"total recoverable."
Ammonia (as N)
C0610
Trans-1,2-dichloroethylene
34546
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
50060
1,1-dichloroethylene
34501
Bis (2-chloroisopropyl) ether
Dissolved oxygen
00300
1,2-dichloropropane
C0541
Bis (2-ethylhexyl) phthalate
Nitrate / Nitrite
00630
1,3-dichloropropylene
77163
4-bromophenyl phenyl ether
Kjeldahl nitrogen
00625
Ethylbenzene
34371
Butyl benzyl phthalate
Oil and grease
00556
Methyl bromide
34413
2-chloronaphthalene
Phosphorus
C0665
Methyl chloride
34418
4-chlorophenyl phenyl ether
Total dissolved solids
70295
Methylene chloride
34423
Chrysene
Hardness
00900
1,1,2,2-tetrachloroethane
81549
Di-n-butyl phthalate
Antimony
01097
Tetrachloroethylene
34475
Di-n-octyl phthalate
Arsenic
01002
Toluene
34010
Dibenzo(a,h)anthracene
Beryllium
01012
1, 1, 1 -trichloroethane
34506
1,2-dichlorobenzene
Cadmium
01027
1,1,2-trichloroethane
34511
1,3-dichlorobenzene
Chromium
C0034
Trichloroethylene
39180
1,4-dichlorobenzene
Copper
01042
Vinyl chloride
39175
3,3-dichlorobenzidine
Lead
01051
Acid -extractable compounds:
Diethyl phthalate
Mercury (Method 1631E)
COMER
P-chloro-m-cresol
34452
Dimethyl phthalate
Nickel
01067
2-chlorophenol
34586
2,4-dinitrotoluene
Selenium
01147
2,4-dichlorophenol
34601
2,6-dinitrotoluene
Silver
01077
2,4-dimethylphenol
34606
1,2-diphenylhydrazine
Thallium
01059
4,6-dinitro-o-cresol
34657
Fluoranthene
Zinc
01092
2,4-dinitrophenol
34616
Fluorene
Cyanide
00720
2-nitrophenol
34591
Hexachlorobenzene
Total phenolic compounds
32730
4-nitrophenol
34646
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
39032
Hexachlorocyclo-pentadiene
Acrolein
34210
Phenol
34694
Hexachloroethane
Acrylonitrile
34215
2,4,6-trichlorophenol
34621
Indeno(1,2,3-cd)pyrene
Benzene
34030
Base -neutral compounds:
Isophorone
Bromoform
32104
Acenaphthene
34205
Naphthalene
Carbon tetrachloride
32102
Acenaphthylene
34200
Nitrobenzene
Chlorobenzene
34301
Anthracene
CO220
N-nitrosodi-n-propylamine
Chlorodibromomethane
34306
Benzidine
39120
N-nitrosodimethylamine
Chloroethane
85811
Benzo(a)anthracene
C0526
N-nitrosodiphenylamine
2-chloroethyl vinyl ether
34576
Benzo(a)pyrene
34247
Phenanthrene
Chloroform
32106
3,4 benzofluoranthene
34230
Pyrene
Dichlorobromomethane
32101
Benzo(ghi)perylene
34521
1,2,4-tichlorobenzene
1,1-dichloroethane
34496
Benzo(k)fluoranthene
34242
1,2-dichloroethane
32103
Bis (2-chloroethoxy) methane
34278
Page 10 of 16
34273
34283
C0100
34636
34292
34581
34641
34320
39110
34596
34556
34536
34566
34571
34631
34336
34341
34611
C0626
34346
C0376
34381
C0700
C0702
34386
34396
34403
34408
34696
34447
34428
34438
34433
34461
34469
C0551

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
(b.) Effluent Scan Reporting. Test results shall be reported electronically via eDMR by December 31 st
of each designated sampling year, except that, subject to prior written approval by the Director, results
can be reported on DWR Form DMR-PPA-1 or other form approved by the Director. The permittee
must at least report completion of the test in the eDMR system by entering " 1 " or "Y" for parameter
code NCO 1 - Annual Pollutant Scan. If written reports are approved, the report shall be submitted to
the following address:
North Carolina Division of Water Resources
Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Or the form may be uploaded at: https:Hedocs.deq.nc.;zov/Fonns/NPDES WW-EDMR-
Supplemental-Form
(c.) 2"d_Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in Condition A. (3.) CHRONIC TOXICITY
PERMIT LIMIT (QUARTERLY), the Permittee shall perform and report the results of four
(4) toxicity tests using the same test methods using a second species of test organism suitable
to the tests being conducted.
(ii.) The 2nd species toxicity tests shall be conducted either:
(A) Once per quarter in a single 12-month period (four samples); if this option is chosen, the
sample for each 2nd species test shall coincide with the quarterly samples collected for
(tox condition title); or
(B) Once per 12-month period in the four -and one-half year period prior to the scheduled
application for permit renewal (four samples); if this option is chosen, three of the sample
for the 2nd species test shall coincide with those for the annual effluent scans and the
coincident quarterly toxicity test, and each of the four annual samples shall be collected
in a different calendar quarter in order to represent seasonal variation.
(iii.) The results of the toxicity tests shall be submitted to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Or, results can be sent to the email, [e-mail].
(iv.) Results of the 2nd species tests shall also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A when submitting the permit renewal application to the
NPDES Wastewater Program.
The Permittee may contact the Division's Aquatic Toxicology Branch at 919-743-8401 for
guidance on conducting the additional toxicity tests and reporting of the results.
Page 11 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A.(7.) DEMONSTRATION OF REPRESENTATIVE SAMPLING (Fecal Coliform, Dissolved
Oxygen & pH Sampling) [G.S. 143-215.1(b); 40 CFR 122.410)]
1. The Permittee shall conduct investigative grab sampling for dissolved oxygen, fecal coliform and
pH in the vicinity of the receiving stream Outfall 001 in conjunction with effluent sampling
conducted at the existing effluent sampling location.
2. A study plan for the additional sampling with the proposed location of the grab sample point should
be provided within 90 days from the permit effective date, by [date]. Once approved, this study
plan should be used for these analyses. Sampling shall be conducted in accordance with monitoring
frequencies as identified in Section A.(1.) and for a period of 2 months during the Winter season
(November 1 — March 31) and 2 months during the Summer season (April 1 — October 31). The
sampling should be conducted on the same day and close enough together in time to be reasonably
comparable.
3. By [date], 12 months of the effective date of the permit, the Permittee shall submit to the Division
a report summarizing the data results. A comparison of the effluent data and the alternative
sampling point should be conducted by the permittee.
4. Should the existing sampling location for fecal coliform, dissolved oxygen and pH be considered
unrepresentative; i.e., there is a statistically significant difference in the results (between locations
001 and 001B) with respect to the receiving stream, the Permittee shall identify and sample at a
location that is representative. This change, once approved, will be incorporated into the permit as
a minor modification.
For e-DMR reporting, monitoring stations will be reported under the following outfalls:
LOCATION
REPORTING OUTFALL
001
Existing Effluent Sampling Location
001B
Study Sampling Location
A. (8.) REOPENER FOR 1,4-DIOXANE [NCGS 143-215.1 (b)]
Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in the North
Carolina Administrative Code at 15A NCAC 21-1.0112 (b) (1) and 21-1.0114 (a) and Part II, Sections B-12
and B-13 of this permit, the Director of DWR may reopen this permit to modify permit requirements to
address 1,4-Dioxane monitoring, treatment and/or compliance.
Page 12 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
A. (9.) PFAS MONITORING REQUIREMENT [NCGS 143-215.1(b)]
This reporting requirement for the per- and polyfluoroalkyl substances (PFAS) parameters listed under
Table 1 of the Final Method 1633 takes effect the first full calendar quarter following six (6) months after
EPA publishes a 40 CFR Part 136 Final PFAS Method for wastewater in the Federal Register. Monitoring
will be at a quarterly frequency.
Find the current parameters listed under Table 1 of the 3rd Draft Method 1633 Analysis of Per- and
Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS at:
htips://www.gpa.fzov/system/files/documents/2022-
12/3rd%20Draft%20Method%201633%20December%202022%2012-20-22_508.pdf
A.(10.) ELECTRONIC REPORTING - 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)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 monthly 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.
Page 13 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
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; and
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. h
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. ?ov/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:
htlp:Hdeq.nc. gov/about/divisions/water-resources/edmr
Page 14 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NC0088846
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 11, 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:
htlp://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. 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 122.4 1].
Page 15 of 16

DocuSign Envelope ID: AF4B3Al2-5365-42D6-B09D-F942858DB95E
Permit NCO088846
Receiving tream', Uape Fear River
Outfall
Facility
Facility
Latitude: 35° 32' 10" N
35' 40' 24" N
g
Longitude', 78°59' 05" W
78' 56' 25" W
Location
Stream Class: WS-V
Towns of Cary and Apex
Subbasin: 03.06-07
Western Wake Regional
8-Digit HUC: 03030004
Water Reclamation Facility
North
NCO088846
W Quad: E23SCokesbur
Page 16 of 16