NC0020834_Permit (Issuance)_20160429

NPDES DOCIMENT SCANNING: COVER SHEET
NPDES Permit:
NC0020834
Warrenton WWTP
Document Type:
Permit Issuance 2
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Compliance
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 29, 2016
This; document iti printed on rewse paper - ignore any
content on the re'rerse raids

PAT MCCRORY
Water Resources
ENVIRONMENTAL. QUALITY
April 29, 2016
Mr. Robert Davie, Town Administrator
Town of Warrenton
P. O. Box 281
Warrenton, North Carolina 27589
Dear Mr. Davie:
Governor
DONALD R. VAN DER VAART
Secretary
S. JAY ZIMMERMAN
Subject: NPDES Permit Issuance
Permit No. NC0020834
Warrenton WWTP
Warren County
Facility Class III
Director
The Division of Water,Resources is forwarding herewith the Final NPDES permit. This permit
renewal is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection
Agency dated October 15, 2007 (or as subsequently amended).
The following changes have been incorporated into this renewal:
• The quarterly monitoring for Total Phenolic Compounds was added to the permit based on
the results of the Reasonable Potential Analysis.
• The quarterly monitoring for Total Thallium was added to the permit based on the results of
the Reasonable Potential Analysis.
• : The monitoring frequency for BOD, TSS, Fecal Coliform and Ammonia Nitrogen was
reduced to 2/week based on the Monitoring Frequency Reduction Evaluation.
• - The Limits for Cyanide were added to the permit based on the results of Reasonable
Potential Analysis.
• The Following special conditions were added to the permit to assure compliance with the
nutrient limits: A. (3.) Calculation of Total Nitrogen or Total Phosphorus Loads, A. (4.)
Annual Limits for Total Nitrogen or Total Phosphorus, and A. (5) Nutrient Allocations.
• The Mercury Minimization Plan (Please see A. (8.)) was added to the permit based on the
results of the Mercury Evaluation.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then
permittees must submit DMRs electronically to the Environmental Protection Agency (EPA).
The requirement to begin reporting discharge monitoring data electronically using the NC
State of North Carolina I Environmental Quality I Water Resources
1617 Mail service Center Raleigh, North Carolina 27699-1611
919 707 9000

DWR's Electronic Discharge Monitoring Report (eDMR) internet application has been added
to the permit. (Please see Special Condition A. (7)).
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless
such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable except after notice to the Division of Water
Resources. The Division may require modification or revocation and reissuance of the permit. This
permit does not affect the legal requirements to obtain other permits which may be required by the
Division of Water Resources, the Division of Energy, Mineral, and Land Resources, the Coastal
Area Management Act, or any other federal or local governmental permit.
If you have any questions on this permit, please contact Sergei Chernikov at 919-807-6386.
Sincerely,
Jay Zimmerman, P.G.
'Director, Division of Water Resources
Hardcopy: Central Files
NPDES Files
Raleigh Regional Office, SWPS
Email: US EPA, Region IV
WSS/Aquatic Toxicology Unit
WSS/Ecosystem Branch/Monitoring Coalition Coordinator

•
Permit NC0020834
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Town of Warrenton
is hereby authorized to discharge wastewater from a facility located at the
Warren County Wastewater Treatment Plant
738 US Highway 401 South
Southwest of Warrenton
Warren County
to receiving waters designated as Fishing Creek in the Tar -Pamlico River Basin
in accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth
in Parts I, II, III and N hereof.
This permit shall become effective June 1, 2016.
This permit and authorization to discharge shall expire at midnight on October 31, 2019.
Signed this day April 29, 2016.
aM
erS. Jay Zimmerman P.G., Director
Division of Water Resources -
By Authority of the Environmental Management Commission
Page 1 of 11

Permit NC0020834
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.
Town of Warrenton is hereby authorized to:
1. Continue to operate an existing 2.0 MGD wastewater treatment plant including the following components:
• Influent pump station
• Mechanically cleaned bar screen
• Vortex grit chamber
• Dual oxidation ditches
• Two secondary clarifiers
• Four tertiary sand filters
♦ Gas chlorination
• Dechlorination (sulfur dioxide)
♦ Aerobic digesters
• Cascade post aeration
♦ Effluent flow measurement
The facility is located off US Highway 401, southwest of Warrenton, Warren County.
2. Discharge from said treatment works at the location specified on the attached map into Fishing Creek, classified
C-NSW, in the Tar -Pamlico River Basin.
Page 2 of 11

Permit NC0020834
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the permittee,is authorized
to discharge from outfall 001. Such discharges shall be limited and monitored9 by the Permittee as specified below
EFFLUENT
GHAit?A f, ,ERISTICS•
'
-_ - _ •.. ._
LIMITS •
. .._ .?. _
MONI-TORING: REQUIREMENTS
�. ,
`- Monthly•
Avera e�
..... _.. �..
Weeks
' '
Avera a
r yetage
Dail y
Maxim` .
- - um
`Measuremt
Frequency ..
Sample
.:,Type..
Sample
i
Locatton
Flow
2.0 MGD
Continuous
Recording
I or E
Total Monthly Flow (MG)
Monitor and Report
Monthly
Recorded or
Calculated
I or E
BOD, 5-day, 20° C 2 .
(April 1— October 31)
9.0 mg/L
13.5 mg/L
2/Week8
Composite
E,I
BOD, 5-day, 20° C 2
(November 1— March 31)
18.0 mg/L
27.0 mg/L
2/Week8
Composite
E,I
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
2/Week8 .
Composite
E,I
NH3 as N
(April 1.— October 31)
2.0 mg/L
.6.0 mg/L
2/Week8
-
Composite
E
NH3 as N
(November 1— March 31)
4.0 mg/L
12.0 mg/L
2/Week8
Composite
E
PH
6.0 — 9.0 standard units
3/Week
Grab
E
Dissolved Oxygen 3, mg/L
3/Week
Grab
E
Dissolved Oxygen, mg/L
Variable4
Grab
U, D
Fecal Coliform (geo. mean)
200/100 mL
400/100 mL
2/Week8
Grab
E
Fecal Coliform (geo. mean)
-
1
Variable4
Grab
-
U, D
Total Residual Chlorine
22 µg/L 5
3/Week
Grab
E
Temperature (°C)
Daily
Grab
E
Temperature (°C)
Variable4
Grab
U, D
Total Nitrogen
(NO2+NO3+TT{N)
Monitor and Report (mg/L)
•
Weekly
(Calculated)
E
Total Kjeldahl Nitrogen
Monitor and Report (mg/L)
Weekly .
Composite
E
Nitrite/Nitrate Nitrogen
(NO2-N+NO3-N)
Monitor and Report (mg/L)
_
Weekly
Composite
E
Total Phosphorus
Monitor and Report (mg/L)
Weekly
Composite
E
Chronic Toxicity6
Quarterly
Composite
E
Total Cyanide
6.6 µg/L
28.0 µg/L
Monthly
Grab
E
Total Copper, µg/L
Quarterly
Composite
E
Total Zinc, µg/L
Quarterly
Composite
E
Total Phenolic
Compounds, mg/L
-
Quarterly
Composite
E
Total Thallium, µg/L
Quarterly
Composite
E
Total Mercury, µg/L •
Quarterly
Composite
E
Total Nitrogen (IN)
Loads°
Monitor and Report, lb/month
2$,523 lb/years 1
Monthly
Annually
Calculated
E
Total Phosphorus (TP)
Loads°
Monitor and Report, lb/month
5,155lb/yearn
Monthly
Annually
Calculated
E
Effluent Pollutant Scan7
Footnote 7
Composite
E
Footnotes:
Page 3 of 11

Permit NC0020834
1. Sample locations: E-Effluent, I -Influent, U-100 feet above the outfall, D-Downstream at NCSR 1600.
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 percent of
the respective monthly average influent value (85% removal).
3. The daily average dissolved oxygen concentration in the effluent shall not fall below 5.0 mg/L.
4. Stream samples shall be collected three times per week June 1 through September 30 and once per week October
1 through May 31. Due to your membership in the Tar -Pamlico Basin Association, instream monitoring required
by this permit is provisionally waived. It will be immediately reinstated should you end your participation in the
Association.
5. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with this
permit. However, you 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.
6. Chronic Toxicity. (Ceriodaphnia) P/F at 76%: March, June, September, and December; see Special Condition A.
(2.). Toxicity monitoring shall coincide with metals monitoring.
7. See Special Condition A. (6.) regarding effluent pollutant scan.
8. The sampling shall be conducted on any two non-consecutive days during the calendar week.
9. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (7).
10. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of time.
See Special Condition A. (3.) CALCULATION OF TN OR TP LOADS.
11. Compliance with mass limits shall be determined in accordance with Special Conditions A. (4) ANNUAL LIMITS
FOR TOTAL NITROGEN OR TOTAL PHOSPHORUS and A. (5) NUTRIENT ALLOCATIONS.
There shall be no discharge ofl'oating solids or visible foam in other than trace amounts.
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200 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 76%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of March, June, September, and December. Effluent
sampling for this testing 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 -February 1998)
or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original) is to be sent to the
following address:
Attention: NC DEQ / DWR / Water Sciences Section
1623 Mail Service Center
Raleigh, North Carolina 27699-1623
Page 4 of 11

Permit NC0020834
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 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. 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 indude 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.
A. (3.) CALCULATION OF TOTAL NITROGEN AND TOTAL PHOSPHORUS LOADS
[G.S. 143-215.1(b)]
(a.) The Permittee shall calculate monthly and annual TN Loads as follows:
Monthly TN .(or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorus concentration (mg/L) of
the composite samples collected during the month
TMF
the Total Monthly Flow of wastewater discharged during the month
(MG/mo)
8.34 = conversion factor, from (mg/L x MG) to pounds
(ii.) Annual 'IN (or TP) Load (lb/yr) = Sum of the 12 Monthly TN (or TP) Loads for the calendar year
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo) in the
appropriate discharge monitoring report for each month and shall report each calendar year's results (lb/yr)
with the December report for that year.
A. (4.) ANNUAL LIMITS FOR TOTAL NITROGEN OR TOTAL PHOSPHORUS
[G.S.142-125.1(b)]
(a-)
(b.)
Total Nitrogen (TN) and Total Phosphorus (TP) allocations and load limits for NPDES dischargers in the
Tar -Pamlico River basin are annual limits and apply on a calendar year basis.
For any given calendar year, the Permittee shall be in compliance with the annual TN (or TP) Load limit in
this Permit if:
(i.) the Permittee's annual TN (or TP) Load is less than or equal to the effective limit, or
(ii.) the Permittee is a Co-Permittee Member of a compliance association.
Page 5 of 11

Permit NC0020834
(c) If the Permittee is not a co-permittee member of a compliance association and the Permittee's cumulative
annual TN (or TP) discharge exceeds the effective 'IN (or TP) Load limit in this permit at any point during
the calendar year, the Permittee is in violation of its TN (or-TP) Load limit for the remainder of the calendar
year, and each day of continuing violation shall constitute a separate violation. Compliance with annual limits
shall be determined separately for each calendar year, and an exceedance in one year does not carry forward to
subsequent years.
(d.) The 'IN (or TP) Load limit in this Permit (if any) may be modified as the result of allowable changes in the
Permittee's allocations.
Allowable changes include those resulting from purchase of TN (or TP) allocation from an authorized
mitigation banker, the Ecosystem Enhancement Program, or other source allowed under applicable
regulations; purchase, sale, trade, or lease of allocation between the Permittee and other dischargers;
and other transactions approved by the Division and consistent with the Tar -Pamlico River Basin
Association Agreement, as revised.
The Permittee may request a modification of the 'IN (or TP) Load limit in this Permit to reflect
allowable changes in its allocation(s). 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 (or TP) 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 / Wastewater Permits Branch
Attn: Tar -Pamlico River Basin Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617 •
(e) If the Permittee is a member and co-permittee of an approved compliance association on January 1 of a given
year, its TN and TP discharges curing that year are governed by that association's group NPDES permit and
the limits therein.
(i.)
(i.)
(m•)
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.
Association roster(s) and members' TN and TP allocations will be updated annually and in accordance
with state and federal program requirements.
(iv.) 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.
(A.) Upon receipt of timely and proper notification, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B.) Membership changes in a compliance association become effective on January 1 of the year
following modification of the association's permit.
(f.) The 'IN and TP monitoring and reporting requirements in this Permit remain in effect throughout the term
of the Permit and are not affected by the Permittee's membership in a compliance association.
A. (5.) NUTRIENT ALLOCATIONS
[G.S.143-125.1(b)]
(a.)
Total Nitrogen (TN) and Total Phosphorus (TP) allocations represent the maximum TN and TP loads that a
discharger or group of dischargers is potentially allowed under the Tar -Pamlico nutrient management strategy.
Allocations are not enforceable limits but are the basis for TN and TP limits established in individual or group
NPDES permits.
Page 6 of 11

Permit NC0020834
(b.) The allocations originally assigned to the Tar -Pamlico Basin Association members total 891,271 lb/yr
(404,274 kg/yr) TN and 161,070 lb/yr (73,060 kg/yr) TP. These group allocations have been divided among
the members in proportion to the maximum permitted flow in each member's permit; that is,
Individual Permitted Flow (MGD)
Individual Allocation (TN or TP) =Total Permitted Flow, TPBA (MGD) x Group Allocation, TPBA (IN or TP)
For the purposes of this distribution, individual permitted flows for the Association members are those in
effect as of July 2014 and result in a Total Permitted Flow of 62.495 MGD.
(c.) The following table lists, for information purposes only, the TN and TP allocations assigned to, acquired by,
or transferred to the Permittee in accordance with the Tar -Pamlico River Basin Phase IV Agreement.
Applicable 'IN or TP limits are established in the Effluent Limitations conditions of this permit or in the
NPDES permit of a compliance association of which the Permittee is a Co-Permittee Member.
ALLOCATION
TYPE
. .
SOURCE-• ` :.
, DATE ��
' ALLOCATION
AMOU NT (1)
STATUS
,..
(lb/yr).
(kg/Yr) ,
Total Nitrogen
Tar -Pamlico River
Basin Phase IV
Agreement
7/9/2015
28,523
12,938
Active
Total
Phosphorus
Tar -Pamlico River
Basin Phase IV
Agreement
7/9/2015
5,155
2,338
Active
(d.) Any addition, deletion, or modification of the listed allocation(s) (other thah to correct typographical errors)
or any change from Reserve to Active 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.) EFFLUENT POLLUTANT SCAN
[G.S. 143-215.1 (b)]
The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One scan must
be performed in. each of the following years: 2017; 20.18, and 2019. 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. Samples should be collected with one quarterly toxicity test each year, and must
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) Trans-1,2-dichloroethylene Bis (2-chloroethyl) ether
Chlorine (total residual, TRC) 1,1-dichloroethylene Bis (2-chloroisopropyl) ether
Dissolved oxygen 1,2-dichloropropane Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether
Kjeldahl nitrogen Ethylbenzene Butyl benzyl phthalate
Oil and grease Methyl bromide 2-chloronaphthalene
Phosphorus Methyl chloride 4-chlorophenyl phenyl ether
Total dissolved solids Methylene chloride Chrysene
Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1,1,1-trichloroethane 1,2-dichlorobenzene
Cadmium 1,1,2-trichloroethane 1,3-dichlorobenzene
Page 7 of 11

Chromium
Copper
Lead
Mercury (EPA Method 1631E)
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane
2-chloroethylvinyl ether
Chloroform
Dichlorobromomethane
1,1-dichloroethane
1,2-dichloxoethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4,6-dinitro-o-cresol
2,4-dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2,4,6-trichlorophenol
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy) methane
Permit NC0020834
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
Nitrobenzene
N-nitro s o di-n-p ropylamin e
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
Reporting. Testfresults shall be reported on DWR Form-A•MR-PPA1 (or in a form approved by the Director) by
December 31st of each designated sampling year. The report shall be submitted to the following address: NC DEQ
/ DWR / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal
facilities that are subject to the Effluent Pollutant Scan requirements listed above are also subject to additional
toxicity testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5). The US EPA requires four (4)
toxicity tests for a test organism other than the test species currently required in this permit. The multiple species
tests should be conducted either quarterly for a 12-month period prior to submittal of the permit renewal
application, or four tests performed at least annually in the four and one half year period prior to the application.
These tests shall be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple
species toxicity test results shall be filed with the Aquatic Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh, North Carolina 27699-1623
Contact the Division's Aquatic -Toxicology Branch at 919-743-8401 for guidance on conducting the additional
toxicity tests and reporting requirements. Results should also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A, when submitting the permit renewal application to the NPDES Permitting
Unit.
Page 8 of 11

Permit NC0020834
A. (7.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports and
specify that, if a state does not establish a system to receive such submittals, then permittees must submit
monitoring data and reports electronically to the Environmental Protection Agency (EPA). 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 forNPDES 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)]
Effective December 21, 2016, 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. Until such time that the state's eDMR application is compliant with
EPA's Cross -Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
A 1'1'.b NTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
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 mailing address above. 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, 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.
Page 9 of 11

Permit NC0020834
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 122.410)(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(6)1
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:
http://ww v2.epa.gov/compliance/final-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 tempora.7 waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the Division unless the
permittee re -applies for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request
may submit monitoring data and reports on paper to the Division for the period that the approved reporting
waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
http: / /deq.nc.gov/about/divisions/water-resources /edmr
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://deq.nc.gov/about/divisions/water-resources/edmr
Page 10 of 11

Permit NC0020834
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 certj, 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 orpersons who manage the system, or tho to persons directly responsible forgathering the information, the
information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are signcant
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 122.41].
A. (8.) MERCURY MINIMIZATION PLAN (MMP)
[G.S. 143-215.1(b)]
Mercury Minimization Plan (Mv :P). The permittee shall develop and implement a mercury minimization plan
during this permit term. The MIvIP shall be developed within 180 days of the NPDES Permit Effective Date, and
shall be available for inspection on -site. A sample MMP was developed through a stakeholder review process and
has been placed on the Division website for guidance (http://deq.nc.gov/about/divisions/water-resources/water-
resources-permits/wastewater-branch/npdes-wastewater-permits, under NC Model Mercury Minimization Plan).
The MMP should place emphasis on identification of mercury contributors and goals for reduction. Results shall be
summarized and submitted with the next permit renewal. Performance of the Mercury Minimization Plan will meet
the requirements of the TMDL (Total Maximum Daily Load) for mercury approved by USEPA on October 12,
2012, unless and until a Waste Load Allocation specific to this facility is developed and this NPDES permit is .
amended to require further actions to address the Waste Load Allocation:
Page 11 of 11

Outfall 001
Warren County WWTP - NC0020834
USGS Quad Name: Warrenton
Receiving Stream: Fishing Creek
Stream Class: C NSW
Subbasin: Tar Pamlico - 030304
Lat.: 36°22'47"
Long.: 78°10'07"
8-Digit HUC:
03020102
(Not to Scale)

1f)7,OIbo
PUBLIC NOTICE
North Carolina
Environmental
Management
Cosru:?i3sion/NP-
DES er.i:
1617 Mail
Serv. -e Center
Raleigh, NC
27699-1617
Notice of Intent to
Issue a NPDES
1Nastewater Permit
The North Caro-
lina Environmental
Mr.nagement Com-
mrssrr.rr proposes
to issue a NPDES
wastewater dis-
charge permit to
the pers<,n(s) listed
Written
c-:r,;rien+;.-- regard-
ing the proposed
permit will be ac-
cepted until 30
days after the pub-
lish date of this no-
tice. The Director of
the NC Division of
Water Resources
(DWR) may hold
a public hearing
should there be a
significant degree
of public Interest.
Please mail com-
ments and/or infor-
mation requests to
DWR at the above
address. Interested
persons may visit
the DWR at 512 N.
Salisbury Street,
Raleigh, NC to re-
view information
on file. Additional
information on NP-
DES permits and
this notice may be
found on our web -
site: http://portal,
ncdenr.org/web/
wq/swp/ps/npdes/
calendar, or by call-
ing [phone]
The Town of
Warrenton has re-
quested renewal of
Permit NC0020834
for Warren County
WWTP in Warren
County; this facility
discharge is treated
municipal waste-
water to Fishing
Creek, Tar -Pamlico
River Basin.
(CHG 1/20)
gra
Affidavit of Printer's Proof
NORTH CAROLINA
WARREN COUNTY
I. JANIE MILLER, Office Manager of
The Warren Record, a weekly newspaper
publication in the town of Warrenton.
Warren County, and state of North
Carolina, do so solemnly swear that a
legal action entitled:
ptAbli cn
no-h ce
a true copy of which is made a part of
this affidavit, did appear in the said The
Warren Record in the following
consecutive issues:
Vao
2016.
Sworn to and subscribed before me this
a !) day of b.(\U(0 \' , 20 l (0.
jilakQQAOSL ZiaCk
Notary Public
My commission expires: la
'Co —n

Z o ► S vti4f),Dr' kilikt\
DEQ/DWR
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0020834
Facility Information
Applicant/Facility Name:
Town of Warrenton/Warrenton WWTP
Applicant Address:
P.O. Box 281; Warrenton, North Carolina 27589
Facility Address:
738 US Highway 401 South, Warrenton, North Carolina 27589
Permitted Flow
2.0 MGD
Type of Waste:
Domestic, Light industrial; no pretreatment program
Facility/Permit Status:
Class III /Active; Renewal
County:
Warren County
Receivin ' Stream:
Stream Classification:
303(d) Listed?
Subasin:
Drainage Area (mi2):
7Q10 (cfs)
30Q2 (cfs)
Aver. • - Flow cfs :
IWC (%):
Miscellaneous
Fishin • Creek Re . 'onal Office:
03-03-04
State Grid / USGS
Quad:
Permit Writer:
Rale' • h
B26NW/Warrenton
Sergei Chernikov,
Ph.D.
December 14, 2015
Lat. 36° 22' 47" N Long. 78° 10' 07" W
BACKGROUND
The Warrenton WWTP (Class III) has a permitted flow of 2.0 MGD. This facility receives and treats
domestic wastewater. It has no Significant Industrial Users and does not implement a pretreatment
program, in the past the facility treated industrial waste.
Warrenton WWTP discharges into Fishing Creek, classified C NSW at this point, in the Tar Pamlico
Basin. The receiving waters are listed as impaired on the current 303 (d) list due to the low level of
the dissolved oxygen.
Since the Town of Warrenton is a member of the Tar Pamlico Nutrient Trading Association, their
permit includes nutrient limits. The required language relating to nutrient limits has been added to
the permit.
NUTRIENT CONTROLS
History of Nutrient Management Strategy for Point Sources
On September 12, 1989, the Environmental Managements Commission classified the Tar -Pamlico
River Basin as Nutrient Sensitive Waters (NSW). On February 13,1992, the Commission approved
a revised NSW Implementation Strategy that established the framework for a nutrient reduction
trading program between point and nonpoint sources of pollution. The Strategy also established
certain conditions to be met by an association of dischargers known as the Tar -Pamlico Basin
Association (the Association). Those conditions are defined in the Tar -Pamlico Nutrient Sensitive
Waters Implementation Strategy (the "Agreement"). Information on the evolution of the program
Page 1 of 4

and past and present versions of the Agreement are available at
http: / /portal.ncdenr.org/web/wq/ps /nps/tarpampointsource.
Addition of Nutrient Limits
In 2009, the U.S. EPA Region 4 offices raised concerns that, although the Agreement set collective
nutrient caps for the members of the Tar -Pamlico Basin Association, the members' NPDES permits
lacked nutrient limits and, as a result, EPA had no means to enforce nutrient controls should it
become necessary. As part of the 2009 permit renewals, the Division added the group caps for
nitrogen and phosphorus, along with related special conditions, to the permits of the fifteen TPBA
member facilities. The Division could not add individual N and P limits at that time, because no
basis existed at the time for dividing the available wasteload allocations among the members.
Instead, the Division agreed to work with the Association to determine an appropriate distribution
and to then add individual N and P limits to the permits as part of the 2014 renewals.
With the consent of the Association, the group caps are distributed among the members in
proportion to their 2014 maximum permitted flows, as follows:
TPBA Members and Nutrient Allocations/ Limits
•
Permit
Owner
Facility
TN
Load
(1b/yr)
299,491
TP
Load
(1b/yr)
54,124
NC0030317
City of Rocky Mount
Tar River Regional WWTP
NC0023931
Greenville Utilities Commission
GUC WWTP
249,576
45,103
NC0020605
Town of Tarboro
Tarboro WWTP
71,307
12,887
NC0025054
City of Oxford
Oxford WWTP
49,915
9,021
NC0020648
City of Washington
Washington WWTP
52,054
9,407
NC0069311
Franklin County
Franklin County WWTP
42,784
7,732
NC0020834
Town of Warrenton
Warrenton WWTP
28,523
5,155
NC0026042
Town of Robersonville
Robersonville WWTP
25,671
4,639
NC0020231
Town of Louisburg
Louisburg WWTP
19,538
3,531
NC0026492
Town of Belhaven
Belhaven WWTP
14,261
2,577
NC0025402
Town of Enfield
Enfield WWTP
14,261
2,577
NC0023337
Town of Scotland Neck
Scotland Neck WWTP
9,626
1,740
NC0020061
Town of Spring Hope
Spring Hope WWTP
5,705
1,031
NC0042269
Town of Bunn
Bunn WWTP
4,278
773
NC0020435
Town of Pinetops
Pinetops WWTP
4,278
773
Given the size and characteristics of the river basin, transport losses were judged to be somewhat
uniform across the basin and were not considered in these calculations. Thus, nutrient limits equal
the nutrient allocations for each facility, unlike in other nutrient management strategies in the state.
The draft permit includes new conditions designed to meet the Division's 2009 commitment. The
group caps and related conditions have been deleted and replaced with individual N and P limits and
a new set of related special conditions.
The nutrient limits are annual mass limits and become effective January 1, 2016. Each members'
limits are equivalent to approximately 4.7 mg/L TN and 0.85 mg/L TP for the member's full
permitted flow.
The special conditions document the N and P allocations assigned to the facility and provide for
consistent calculation of nutrient loads by all members. They also establish how compliance with the
N and P limits will be determined if the Association members apply for and obtain a group NPDES
permit to control their nutrient discharges collectively. The members have indicated they plan to
Page 2 of 4

apply for such a permit, and the Division initiated discussions with the members on that approach in
2012.
MONITORING FREQUENCY REDUCTION EVALUATION
The effluent was evaluated in accordance with the Monitoring Frequency Reduction Review
Guidance. The facility has met the requirements of the guidance for TSS, BOD, Fecal Coliforms and
Ammonia nitrogen. Therefore, monitoring for these parameters will be reduced from 3/Week to
2/Week.
REASONABLE POTENTIAL ANALYSIS (RPA)
The Division conducted EPA -recommended analyses to determine the reasonable potential for
toxicants to be discharged at levels exceeding water quality standards/EPA criteria by this facility
from outfall 001. For the purposes of the RPA, the background concentrations for all parameters
were assumed to be below detections level. The RPA uses 95% probability level and 95%
confidence basis in accordance with the EPA Guidance entitled "Technical Support Document for
Water Quality -based Toxics Control."
The long term discharge data on the EPA Form 2C was used in the analysis. Calculations included:
As, Be, Cd, Total Phenolic Compounds, Cr, Cu, CN, Pb, Hg, Ni, Se, Ag, Zn, Sb and T1 (please see
attached). Based on the RPA, the limits for CN and Quarterly monitoring for Total Phenolic
Compounds and Thallium will be added to the permit.
MERCURY EVALUATION
The State of North Carolina has a state-wide mercury impairment. The TMDL has been developed
to address this issue in 2012. The TMDL included the implementation strategy, both documents were
approved by EPA in 2012.
The mercury evaluation was conducted in accordance with the Permitting Guidelines for Statewide
Mercury TMDL.
Year
2010
2011 _
2013
Annual average
concentration (ng/L)
<200
<200
3.57
Maximum sampling
result (ng/L)
<200
<200
3.57
The allowable mercury concentration for this facility is 15.9 ng/L. None of the annual average
concentrations exceed the allowable concentration. Therefore, based on the Permitting Guidelines for
Statewide Mercury TMDL, the Mercury WQBEL is not required. However, the Mercury
Minimization Plan will be added to the permit since there are multiple detections above 1 ng/L.
TOXICITY TESTING-OUTFALL 001, OUTFALL 002, OUTFALL 004, AND OUTFALL 008
Current Requirement: Outfall 001 — Chronic P/F @ 76% using Ceriodaphnia dubia
Recommended Requirement: Outfall 001 — Chronic P/F @ 76% using Ceriodaphnia dubia
This facility has passed all toxicity tests during the previous permit cycle (23 out of 23), please see
attached.
COMPLIANCE SUMMARY
During the last 5 years, the facility has exceeded limit 2 times, please see attached. The limit violations were for
pH and BOD.
Page 3 of 4

PERMIT LIMITS DEVELOPMENT
• BOD limits in the permit are based on the water quality model.
• TSS limits in the permit are based on the requirements of the 40 CFR 133.102. and 15A NCAC
2B .0406
• The Ammonia limits in the permit are based on the water quality model. The Division uses
ammonia criteria that were developed by EPA: 1 mg/L - summer; 1.8 mg/L — winter.
• The pH limits in the permit are based on the requirements of the 15A NCAC 2B .0200.
• The Fecal Coliforms limits in the permit are based on the requirements of the 15A NCAC 2B
.0211.
• The TRC limit in the permit is based on the requirements of the 15A NCAC 2B .0211.
• The Whole Effluent Toxicity limit is based on the requirements of the 15A NCAC 2B .0500.
• The Water Quality Based Effluent Limits for Cyanide are based on the results of the
Reasonable Potential Analysis.
• The Total Nitrogen load and the Total Phosphorus load are established in accordance with
the Tar -Pamlico Nutrient Sensitive Waters Implementation Strategy.
PROPOSED CHANGES
• The quarterly monitoring for Total Phenolic Compounds was added to the permit based on
the results of the Reasonable Potential Analysis.
• The quarterly monitoring for Total Thallium was added to the permit based on the results of
the Reasonable Potential Analysis.
• The monitoring frequency for TSS, BOD, Fecal Coliform and Ammonia Nitrogen was
reduced to 2/week based on the Monitoring Frequency Reduction Evaluation.
• The Limits for Cyanide were added to the permit based on the results of Reasonable
Potential Analysis.
• The Following special conditions were added to the permit to assure compliance with the
nutrient limits: A. (3.) Calculation of Total Nitrogen or Total Phosphorus Load, A. (4.) Annual
Limits for Total Nitrogen or Total Phosphorus, A. (5.) Nutrient Allocations.
• The Mercury Minimization Plan (Please see A. (8.)) was added to the permit based on the
results of the Mercury Evaluation.
• Proposed federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and specify that, if a state does not establish a system to receive such submittals,
then permittees must submit DMRs electronically to the Environmental Protection Agency
(EPA). The Division anticipates that these regulations will be adopted and is beginning
implementation.
The requirement to begin reporting discharge monitoring data electronically using the NC
DWR's Electronic Discharge Monitoring Report (eDMR) internet application has been added
to the permit. (Please see Special Condition A. (7.)).
Proposed Schedule for Permit Issuance
Draft Permit to Public Notice:
Permit Scheduled to Issue:
January 12, 2016
March 7, 2016
NPDES Contact
If you have questions regarding any of the above information or on the attached permit, please contact
Sergei Chernikov at [phone].
Page 4 of 4

Warren County WWTP
NC0020834
Qw (MGD) = 2.00
1Q1OS(cfs)= 0.84
7Q1OS(cfs)= 1.00
7QIOW (cfs) = NO 7Q10w DATA
30Q2 (cfs) = 8.90
Avg. Stream Flow, QA (cfs) = 46.70
Receiving Stream: Fishing Creek
2014 Freshwater RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
W WTP/WTP Class: Ill
IWC @ 1QIOS = 78.680203%
IWC @ 7Q10S = 75.609756%
IWC@7Q1OW= N/A
IWC @ 30Q2 = 25.833333%
IWC @ QA = 6.224900%
Stream Class: C NSW
Outfall 001
Qw=2 MGD
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
PQL
UNITS
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS / Applied V2 FAV /
Chronic Standard Acute
Max Pred
ri # Det Cw Allowable Cw
Arsenic
Arsenic
C
C
50 FW(7Q10s)
10 HH/WS(Qavg)
ug/L
ug/L
3 0
Note: n <9
Limited data se
3 0
Note: n <_ 9
15.0
Default C.V.
15.0
Default C.V.
Acute: NO WQS
_ _ —_— __--
Chronic: 66.1
N_ o value > Allowable__C_w _
Chronic: 160.6
No value> Allowable Cw
oo limit_
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Beryllium
NC
6.5 FW(7Q10s)
ug/L
3 0
Note: n<9
Limited data set
7.5
Default C.V.
Acute: NO WQS
_ _ —_— __—_
Chronic: 8.6
No value > Allowable Cw
no limit
__----------- — — — — — — —
Cadmium
NC
2 FW(7Q10s) 15
will-
3 0
Note: n <9
Limited data set
7.5
Default C.V.
Acute: 19.1
_ _ ______ ____
Chronic: 2.6
No value > Allowable Cw
no limit
_ _ _ _ _ _ _______________
all values below detect
Chlorides (AL)
NC
230 FW(7Q10s)
mg/L
0 0
N/A
Acute: NO WQS
_ _ _ — — _ _ —
Chronic: 304
nla
_ — — — — — — — — — — — — —
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
Acute: NO WQS
-_
—Chronic: _ -----3.9 ---
n/a
----------------------------
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 3
Note: n <9
Limited data set
39,000.0
Default C.V.
Acute: NO WQS
_ _ —__ _ _
Chronic: 1,161.3
2 value(s) > Allowable Cw
add quarterly monitoring
_ — — — — — — — — — — — — —
Chromium
NC
50 FW(7Q10s) 1022
ttg/I,
3 0
Note: n<9
Limited data set
15.0
Default C.V.
Acute: 1,298.9
_ ---__ __--
Chronic: 66.1
No value > Allowable Cw
no limit
_-------------- — — — --- —
Copper (AL)
NC
7 FW(7Q10s) 7.3
ug/L
20 13
26.8
Acute: 9.3
Chronic: 9.3
9 value(s) > Allowable Cw
no limit
Action Level Standard
Cyanide
NC
5 Pl1'(7QIUs) _-
10
ug/L
19 4
17.9
Acute: 28.0
_ _—_— __—_
Chronic:6.6
3 value(s)> Allowable Cw
add limit
—_---------------_-----_----
Page 1 of 2
20834-RPA-2015, rpa
12/9/2015

Warren County WWTP
NC0020834
2014 Freshwater RPA - 95%, Probability/95% Confidence
Outfall 001
Qw=2 MGD
Fluoride
NC
1800
FW(7Q10s)
us%I.
0 0
N/A
Acute: NO WQS
__ _ ---_ _ _
-2---------------------------- Chronic:,380.d
n;a
Lead
NC
25
FW(7Q10s)
33.8
ug/L
3 0
Note: n<9
Limited data set
15.0
Default C.\%.
Acute: 43.0
Chronic: 33.1
No value > Allowable Cw
no limit
— — —
— —
— — — — — —
Mercury
NC
12
FW(7Q10s)
0.5
ng/L
3 I
Note: a<9
Limited data set
10,710.0
Default C.V.
Acute: NO WQS
- ------addfmit-
Chronic: 15.9
3 value(s)> Allowable Cw
`✓_, --._-_----------
`
Molybdenum
NC
2000
HH(7Q10s)
ug/L
0 0
N/A
Acute: NO WQS
Chronic: 2,645.2 ----------------------------
Na
Nickel
NC
88
FW(7Q10s)
',,I
ug/L
3 3
Note: n<9
Limited data set
5.0
Default C.V.
Acute: 331.7
_ _ _
Chronic:116.4 ---- --
No value > Allowable Cw
no limit
-------------------------
---
Selonium
NC
5
FW(7Q10s)
56
u_/L
3 0
Note: n 5.9
Limited data set
15.0
Default C.V.
Acute: 71.2
_ _ _ _ _ _
Chronic: 6.6
No value > Allowable Cw
no limit
_ _ _ _ _ _ _ _
all values below detect
_ _ _ _ _ _
Silver(AL)
NC
0.06
FW(7Q10s)
1.23
ug/L
3 0
Note: n < 9
Limited data set
15.000
Default C.V.
Acute: 1.563
_ _ _____ _ __
Chronic: 0.079
3 value(s)> Allowable Cw
no limit
_ _ _ _ _ _ ________________
Action Level Standard
Zinc (AL)
NC
50
FW(7Q10s)
67
ug/L
20 20
115.2
Acute: 85.2
_ _
Chronic----- _ 66.1_---
8 value(s)> Allowable Cw
no limit
----------------------------
Action Level Standard
Thallium
NC
0.47
HH(7Q10s)
µg/L
3 0
Notc: n < 9
Limited dale set
30.00000
Default C.V.
Acute: NO WQS
_ _ ______ _ __
Chronic: 0.62161
I value(s)> Allowable Cw
add quarterly monitoring
____________________________
Antimony
NC
640
HH(7QI0s)
µg/L
3 0
Note: n < 9
Limited data set
37.50000
Default C.V.
Acute: NO WQS
_ _ _ _ _ _
Chronic:846.45161
No value > Allowable Cw
no limit
_ _ _ _ _ _ _ _
_ _ _ _ _ _
0 0
N/A
Acute:
---------
Chronic:
---------------------------.
0 0
N/A
Acute:
• _ ----------
Chronic:
-------------------------
--
Page 2 of 2
20834-RPA-2015, rpa
12/9/2015

REASONABLE POTENTIAL ANALYSIS
1
Arsenic - FW Standard
Date Data BDL=1/2DL Results
1 < 10 5 Std Dev.
2 < 5 2.5 Mean
3 < 5 2.5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL.
Values" then "COPY"
. Maximum data
points = 58
2
Arsenic - HHIWS Standards
Automatically copies
Arsenic data from FW
Standard entries
Date Data BDL=1/2DL Results
1.4434 1 1/0/1900 < 10 5 Std Dev. 1.4434
3.3333 2 1/0/1900 < 5 2.5 Mean 3.3333
0.6000 3 1/0/1900 < 5 2.5 C.V. (default) 0.6000
3 4 n 3
5
3.00 6 Mult Factor = 3.00
5.0 ug/L 7 Max. Value 5.0 uglL
15.0 ug/L 8 Max. Pred Cw 15.0 ug/L
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
20834-RPA-2015, data
- 1 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
3
Beryllium
Date Data BDL=1120L Results
1 < 5 2.5 Std Dev.
2 < 2 1 Mean
3 < 2 1 C.V. (default)
4 n
5
6 Mull Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
4
Cadmium
Date Data BDL=1/2DL Results
0.8660 1 < 2 1 Std Dev.
1.5000 2 < 5 2.5 Mean
0.6000 3 < 5 2.5 C.V. (default)
3 4 n
5
3.00 6 Mult Factor =
2.5 ug/L 7 Max. Value
7.5 ug/L 8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL.
Values" then "COPY"
. Maximum data
points = 58
0.8660
2.0000
0.6000
3
3.00
2.5 ug/L
7.5 ug/L
-2-
20834-RPA-2015, data
12/9/2015

REASONABLE POTENTIAL ANALYSIS
5
Chlorides (AL)
Date Data BDL=II2DL Results
1 Std Dev.
2 Mean
3 C.V.
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL-
Values" then "COPY"
Maximum data points =
58
6
Chlorinated Phenolic Compounds
NO DATA
NO DATA
NO DATA
0
N/A
N/A mg/L
N/A mg/L
Use "PASTE SF
Values" then ",
. Maximum
points =
Date Data BDL=II2DL Results
1 Std Dev. NO DATA
2 Mean NO DATA
3 C.V. NO DATA
4 n 0
5
6 Mult Factor = N/A
7 Max. Value N/A
8 Max. Pred Cw N/A
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
20834-RPA-2015, data
- 3 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
ECIAL
COPY"
iata
18
7
Total Phenolic Compounds
ug/L
ug/L
Date Data BDL=1/2DL Results
1 13 13 Std Dev.
2 13000 13000 Mean
3 7700 7700 C.V. (default)
4
5
6 Mull Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
8
Chromium
6529.9584
6904.3333
0.6000
3
3.00
13000.0 ugIL
39000.0 ugIL
Date Data BDL=1/2DL Results
1 < 5 2.5 Std Dev.
2 < 10 5 Mean
3 < 10 5 C.V. (default)
4
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE Sr
Values" then " 1
. Maximum
points = 5
1.4434
4.1667
0.6000
3
3.00
5.0
15.0
- 4 -
20834-RPA-2015, data
12/9/2015

REASONABLE POTENTIAL ANALYSIS
?ECIAL
COPY"
'Iata
9
Copper (AL)
I " Date Data BDL=1/2DL Results
1 20 20 Std Dev.
2 19 19 Mean
3 15 15 C.V.
4 14 14 n
5 14 14
6 14 14 Mult Factor =
ug/L 7 13 13 Max. Value
ug/L 8 12 12 Max. Pred Cw
9 12 12
10 < 10 5
11 < 10 5
12 < 10 5
13 < 10 5
14 < 10 5
15 < 10 5
16 < 10 5
17 8.5 8.5
18 7.7 7.7
19 5 5
20 2 2
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY-
. Maximum data
points = 58
10
Cyanide
5.3246
9.5600
0.5570
20
1.34
20.0 ug/L
26.8 ug/L
Use "PASTE Sr
Values" then "I
. Maximum 8
points ='_
Date Data BDL=1/2DL Results
1 < 5 5.0 Std Dev. 2.7059
2 < 5 5.0 Mean 6.11
3 < 5 5.0 C.V. 0.4432
4 < 5 5.0 n 19
5 < 5 5.0
6 < 5 5.0 Mult Factor = 1.28
7 < 5 5.0 Max. Value 14.0
8 < 5 5.0 Max. Pred Cw 17.9
9 < 5 5.0
10 < 5 5.0
11 < 5 5.0
12 < 5 5.0
13 < 5 5.0
14 < 5 5.0
15 8 5.0
16 10 10.0
17 12 12.0
18 14 14.0
19 < 10 5.0
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
20834-RPA-2015, data
- 5 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
t>tECIAL
Fops
late J
11
Fluoride
Date Data BDL=1/20L Results
1 Std Dev.
2 Mean
3 C.V.
4 n
5
6 Mult Factor =
ug/L 7 Max. Value
ug/L 8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE SPECIAL
Values" then "COPY"
. Maxirnum data
points = 68
12
Lead
NO DATA
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
Use"PASTE SF
Values" then ",
. Maxirnum r
points = 5
Date Data BDL=1/2DL Results
1 < 10 5 Std Dev. 1.4434
2 < 5 2.5 Mean 3.3333
3 < 5 2.5 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor = 3.00
7 Max. Value 5.0
8 Max. Pred Cw 15.0
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
-6-
20834-RPA-2015, data
12/9/2015

REASONABLE POTENTIAL ANALYSIS
13
ECIAL
coPr
iata •
i8
Date Data BDL=1/2DL Results
1 < 200 100 Std Dev.
2 < 200 100 Mean
3 3570 3570 C.V. (default)
4 n
5
6 Mult Factor =
ug/L 7 Max. Value
ug/L 8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Mercury
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
2003.4054
1256.6667
0.6000
3
3.00
3570.0 ng/L
10710.0 ng/L
14
Use"PASTE SF
Values" then "i
. Maximum t
points = 5
Date Data BDL=1/2DL Results
1 S1d Dev. NO DATA
2 Mean NO DATA
3 C.V. NO DATA
4 n 0
5
6 Mult Factor = N/A
7 Max. Value N/A
8 Max. Pred Cw N/A
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Molybdenum
20834-RPA-2015, data
- 7 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
,ECIAL•
COPY"
Jata
;8
15
Nickel
Date Data BDL=1/2DL Results
1 < 10.0 5 Std Dev.
2 < 10.0 5 Mean
3 < 10.0 5 C.V.
4 n
5
6 Mult Factor =
ug/L 7 Max. Value
ug/L 8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
16
Selenium
0.0000
5.0000
0.0000
3
1.00
5.0 ug/L
5.0 ug/L
Date Data BDL=1/2DL Results
1 c 10 5 Std Dev.
2 c 2 1 Mean
3 c 2 1 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
- 8 -
20834-RPA-2015, data
12/9/2015

REASONABLE POTENTIAL ANALYSIS
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
17
Silver (AL)
2.3094
2.3333
0.6000
3
3.00
5.0 ug/L
15.0 ug/L
Date Data BDL=1/2DL Results
1 < 5 2.5 Std Dev.
2 < 10 5 Mean
3 < 10 5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values' then "COPY"
. Maximum data
points = 58
18
Zinc (AL)
1.4434
4.1667
0.6000
3
3.00
5.000 ug/L
15.000 ug/L
Date Data BDL=1/2DL Results
1 96 96 Std Dev.
2 91 91 Mean
3 90 90 C.V.
4 89 89 n
5 75 75
6 73 73 Mult Factor =
7 72 72 Max. Value
8 70 70 Max. Pred Cw
9 66 66
10 64 64
11 61 61
12 59 59
13 54.3 54.3
14 54 54
15 52 52
16 48 48
17 45.5 45.5
18 45 45
19 34 34
20 10 10
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
20834-RPA-2015, data
- 9 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
19
Thallium
21.0996
62.4400
0.3379
20
1.20
96.0 ug/L
115.2 ug/L
Date Data
<
BDL=1/2DL
20 10
1 0.5
1 0.5
Results
Std Dev.
Mean
C.V. (default)
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL.
Values" then "COPY"
. Maximum data
points = 58
20
Antimony
5.4848
3.6667
0.6000
3
3.00
10.000000 pg/L
30.000000 pg/L
Date Data BDL=1/2DL
25 12.5
< 3 1.5
< 3 1.5
- 10 -
20834-RPA-2015, data
12/9/2015

REASONABLE POTENTIAL ANALYSIS
Results
Std Dev.
Mean
C.V. (default)
n
Use 'TASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
21
0
6.3509
5.1667
0.6000
3
Mult Factor = 3.00
Max. Value 12.500000 pg/L
Max. Pred Cw 37.500000 Ng/L
Date Data
BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use"PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
22
0
NO DATA
NO DATA
NO DATA
0
N/A
N/A
N/A
Date Data
BDL=1/2DL
20834-RPA-2015, data
- 11 - 12/9/2015

REASONABLE POTENTIAL ANALYSIS
Results
Std Dev.
Mean
C.V.
n
Mull Factor =
Max. Value
Max. Pred Cw
Use"PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
NO DATA
NO DATA
NO DATA
0
N/A
N/A
N/A
- 12 -
20834-RPA-2015, data
12/9/2015

Templeton, Mike
From: Belnick, Tom
Sent: Monday, March 09, 2015 1:51 PM
To: Templeton, Mike; Hennessy, John
Cc: Risgaard, Jon
Subject: RE: action on tar-pam permits
Since we did not have any kickoff for this basin, it might be good to put a note in the permit files to remind permit
writers to not start renewals until Ph 4 completed. Drafts can go to public notice without the Supervisor review.
Tom Belnick
Supervisor, NPDES Complex Permitting Unit
NCDWR/Water Quality Programs
919-807-6390
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties
From: Templeton, Mike
Sent: Monday, March 09, 2015 11:20 AM
To: Hennessy, John
Cc: Belnick, Tom; Risgaard, Jon
Subject: action on tar-pam permits
John —
You, Tom, and I decided a few months ago that it would be best to delay action on permits for the 15 Association
members until the Phase IV agreement is worked out; we would then add nutrient limits and get those permits going.
We also agreed that the rest of the Tar -Pam permits could go out any time.
I saw last week that draft permits for two members of the Tar -Pam Association went out to public notice in mid -
February: Scotland Neck, NC0023337, and Spring Hope, NC0020061.
We will have to come back and modify these permits when the agreement is finalized, to add the new nutrient
conditions. The mods will require a second public notice at some cost to us. The three of us decided to hold these 15
permits precisely to avoid the added expense, though we knew it would temporarily add to the backlog. This was a
branch -level decision, not a unit decision.
In addition, it has taken a good deal of effort over several years to get the Tar -Pam dischargers on board with the new
requirements. It does not help our credibility that, after John Huisman and I (with a nod from you and Tom) told them
we would delay their renewals, these two drafts went to notice.
I'd be glad to talk to you and Tom further if we need to revisit this decision, but until a different decision is made please
continue to hold the permits for Tar -Pam Association members.
- Mike T
Michael E. Templeton, P.E.
Wastewater Branch
Water Quality Permitting Section
NCDENR • DWR Raleigh, NC
Tel: [phone]
Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.
1/1

Zoi�c t44i
Walter M. Gardner, Jr.
Mayor
TOWN OF WARRENTON
Historically Great - Progressively Strong"
P 0 Box 281
Warrenton, NC 27589-0281
Robert Davie
Administrator
April 3, 2014
NC Department of Environment and Natural Resources
Division of Water Quality/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Permitting Unit:
RECEIVE ENR/DW
R
APR -8 D d
Water Resource8
Permitting Section
Subject: NPDES Permit Renewal
Town of Warrenton
NPDES Permit #NC0020834
Warren County
The Town of Warrenton is submitting the renewal application for NPDES permit #NC0020834.
The permit application consists of:
- Cover letter
- Form 2A — NPDES Application for Permit Renewal
- Supplemental Application Information — Parts D & E
Pollutant Analysis results for the years of: 2013, 2012, and 2011
Topographic Map
- Process Flow Schematic
Sludge Management Plan
3-year data summary for "exceptional compliance"
Two copies of "Application for Permit Renewal"
The Town was unaware that second species toxicity testing was required for the permit renewal.
Once we were told of this requirement, we made arrangements to conduct the tests. One second
species toxicity test has already been done and the others will be completed and submitted prior
to permit expiration and results submitted to NC DWR as required. The test dates for other
second species testing are the months of: March, June and September.

The Town would like to request that the following modifications be made to the permit:
The WWTP has passed all toxicity testing for this permit period. Since copper and zinc
monitoring/limits are usually added due to toxicity failures, we request that these
parameters be removed from the permit. The sample results for copper show very little
fluctuation in the past permit period. This indicates that there are no direct sources of
copper into the treatment plant and that these levels should remain consistently low.
Additionally, the majority of the effluent copper results have been below detection levels.
The effluent zinc levels have been pretty consistent for the permit term with no noticeable
effects on the receiving stream and no effects on toxicity.
It is requested that daily effluent monitoring for temperature be removed. Temperature of
the effluent is an uncontrollable parameter and has no bearing on the receiving waters.
The flow into the treatment facility is domestic in nature and is not subject to any
unexpected fluctuations.
The permit has a monitoring requirement for Cyanide. Effluent test results for the review
period show that cyanide levels are below detection levels. We request that this
parameter be removed from the permit.
The WWTP had an active Industrial Pretreatment Program at one time. Due to loss of
industry, the Pretreatment Program in now inactive. The flow to the WWTP is mainly
domestic in nature with commercial and minor manufacturing dischargers. Monitoring
data for the past three scans show "No Detect" on all volatile organic compounds, acid -
extractable compounds and base -neutral compounds. We request that the monitoring
requirement for the Effluent Pollutant Scan be removed from the permit.
- If second species monitoring is to be continued to be required for permit renewal, we
request that one per year be included in the permit.
- We request that monitoring for BOD, TSS, Ammonia Nitrogen and Fecal Coliform be
reduced under the "exceptionally performing facilities" criteria. The attached data
(summarized in the following table) indicates that the WWTP effluent has exceeded the
minimum criteria for reduced monitoring. The most restrictive limits were used for BOD
and Ammonia Nitrogen. In addition to the monitoring results, the plant meets the other
listed criteria in the guidelines.
Analysis of testing results for the past three years:
- Percent of Monthly Average Limit
Parameter
Monthly Limit
3-Year Average
% of Limit
BOD
9.0 mg/1
1.2 mg/1
13%
TSS
30.0 mg/L
1.4 mg/L
5%
Ammonia N
2.0 mg/L
0.05 mg/L
2.5%
Fecal Coliform
200/100 ml
30.5 colonies/100 ml
15%

- Number of Samples Over 200% of Monthly Average Limit
Parameter
200% of Monthly Limit
Number of Samples Over
BOD
18 mg/1
1
TSS
60 mg/L
0
Ammonia N
4.0 mg/L
0
Eight (8) Fecal Coliforms exceeded the upper reporting of 300 colonies per ml
We thank you for your consideration in these matters. If you have any additional questions or
comments, please call Bill Perkinson at [phone].
Sincerely,
i.
Robert Davie, Town Administrator
Town of Warrenton

Warren County WWTP
NC0020834 — Qutfall 001
Supplement to NPDES Permit Renewal (Tar -Pamlico)
E 4. Summary of Chronic Toxicity Data (previously submitted)
Collection Date
Start Date
Sample Type
Test Method
Test Result
06/7/09
06/8/09
24 Hour Composite
NC Chronic
Pass
03/15/09
03/16/09
24 Hour Composite
NC Chronic
Pass
12/5/10
12/6/10
24 Hour Composite
NC Chronic
Pass
09/12/10
09/13/10
24 Hour Composite
NC Chronic
Pass
06/6/10
067/10
24 Hour Composite
NC Chronic
Pass
03/7/10
03/8/10
24 Hour Composite
NC Chronic
Pass
12/11/11
12/12/11
24 Hour Composite
NC Chronic
Pass
09/11/11
09/12/11
24 Hour Composite
NC Chronic
Pass
06/12/11
06/13/11
24 Hour Composite
NC Chronic
Pass
03/13/11
03/14/11
24 Hour Composite
NC Chronic
Pass
12/9/12
12/10/12
24 Hour Composite
NC Chronic
Pass
09/9/12
09/10/12
24 Hour Composite
NC Chronic
Pass
06/3/12
06/4/12
24 Hour Composite
NC Chronic
Pass
03/11/12
03/12/12
24 Hour Composite
NC Chronic
Pass
12/8/13
12/9/13
24 Hour Composite
NC Chronic
Pass
09/15/13
09/16/13
24 Hour Composite
NC Chronic
Pass
06/2/13
06/3/13
24 Hour Composite
NC Chronic
Pass
03/3/13
03/4/13
24 Hour Composite
NC Chronic
Pass

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Warren County WWTP
NC0020834 — Outfall 001
Supplement to NPDES Permit Renewal (Tar -Pamlico)
Sludge Management Plan
The Town of Warrenton operates a 2.0 MGD activated sludge treatment plant. The facility has
the following solids handling tanks:
• Two 125,000 gallon aerobic sludge digesters
Thickened wastewater treatment residuals are wasted from the secondary clarifiers to the sludge
digester. In the digester, the solids are stabilized and thickened. When the sludge in a digester is
thickened, it is aerated until a land application event. Prior to pumping the thickened sludge for
land application, the sludge is lime stabilized for Vector Attraction and Pathogen reduction. The
stabilized sludge is pumped to sludge transport vehicle for land application by a certified land
application contractor.
In the event land application cannot occur or if there are any other problems that would
necessitate alternate disposal, the WWTP has conducted a pilot study for the use of dewatering
boxes and composting as an alternate.

Three Year Data Summary - Town of Warrenton NC0020834
2013 BOD Ave BOD Max TSS Ave TSS Max FC Ave FC Max NH3 Ave NH3 Max
January 1.1 4.4 1.6 4.9 43 68 0.04 0.13
February 1.2 2.6 1.4 3.9 28 63 0.05 0.17
March 2.4 6.9 0.5 2.7 54 77 0.04 0.06
April 1.8 6.6 1.2 2.5 25 68 0.09 0.07
May 1.5 6.6 0.3 3.7 29 59 0.02 0.07
June 0.5 3.8 1.2 1.2 76 300 0.01 0.01
July 4.2 27.8 1.2 2.5 59 112 0.01 0.01
August 1.1 9 1.2 1.2 64 300 0.01 0.01
September 1.2 6.7 1.2 1,2 43 88 0.01 0.01
October 0.6 3.1 1.2 1.2 49 175 0.01 0.28
November 2 3.1 4.6 20 76 300 0.01 0.02
December 4.6 6.7 3 6 161 300 0.01 0.01
2012 BOD Ave BOD Max TSS Ave TSS Max FC Ave FC Max NH3 Ave NH3 Max
January 0.3 2.2 0.9 3.1 19 98 0.03 0.07
February 1.2 3.2 0.4 2.9 17 105 0.09 0.32
March 0.2 2.5 1.2 1.2 26 250 0.19 2.50
April 1.0 1.0 1.2 1.2 30 58 0.04 0.10
May 1.0 1.0 1.2 1.2 24 70 0.01 0.06
June 1.0 1.0 0.8 10.6 33 73 0.04 0.07
July 1.0 1.0 0.2 2.5 37 72 0.03 0.10
August 1.0 1.0 1.2 1.2 13 105 0.02 0.08
September 1.0 1.0 1.2 1.2 30 265 0.04 0.12
October 0.2 2.2 1.2 1.2 10 52 0.05 0.16
November 1.2 2.6 1.1 3.5 45 59 0.11 0.22
December 0.9 3.3 1.4 2.5 63 290 0.1 0.32
2011 BOD Ave BOD Max TSS Ave TSS Max FC Ave FC Max NH3 Ave NH3 Max
January 2.7 11.0 6.8 9.4 70 157 0.12 0.18
February 0.6 2.7 2 5.5 66 170 0.08 0.20
March 1.0 2.8 1.1 3.2 36 >300 0.14 1.24
April 0.8 2.9 1.2 1.2 11 51 0.09 0.43
May 1.0 1.0 1.2 1.2 13 17 0.01 0.01
June 0.1 2.0 1.2 1.2 22 >300 0.01 0.03
July 0.3 2.1 0.7 5.4 25 285 0.01 0.12
August 1.0 1.0 1.2 1.2 9 66 0.01 0.09
September 1.0 1.0 1.2 1.2 12 >300 0.02 0.09
October 1.0 1.0 1.2 1.2 20 >300 0.02 0.16
November 0.6 2.7 0.2 2.8 11 270 0.08 0.30
December
3-Year Average 1.2 1.4 30.5 0.05
Permit Limit 9.0 30.0 200 2.0
% of Limit 13% 5% 15% 2.5%

Walter M. Gardner, Jr.
Mayor
TOWN OF WARRENTON
Historically Great - Progressively Strong"
P O Box 281
Warrenton, NC 27589-0281
Robert Davie
Administrator
February 1, 2016
NC Department of Environmental Quality
Division of Water Resources/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Permitting Unit:
RECEIVEDINCDEQIDWR
FEB 052015'
Water Quality
Permitting Section
Subject: NPDES Draft Permit - Comments
Town of Warrenton
NPDES Permit #NC0020834
Warren County
The Town of Warrenton received a draft NPDES permit dated January 12, 2016 for review and
comment. We appreciate the reduction in monitoring granted for exceptional compliance. In our
permit renewal cover letter, we had requested that several changes be made to the permit and
these changes were not made in the draft permit. We will reiterate our request for these changes
along with additional comments.
The Town would like to request the following changes to the permit:
A. The draft permit contained a quarterly monitoring requirement for mercury. We are
requesting that monitoring be removed from the permit. Effluent mercury results for the
plant have been below detection for 50% of the results and just about detection levels for
the other 50% of the samples. NC DWR implemented a Mercury Post-TMDL
Permitting Strategy (September 12, 2012) that establishes criteria for the permitting and
monitoring of mercury. Based on our understanding of the strategy, as a major municipal
facility without existing limits, that mercury monitoring is to be conducted only in
conjunction with the priority pollutant analysis. We ask that the permit be modified to
reflect these requirements.
B. The Division denied our request for removing Cyanide from the permit and added a limit
because of the potential to exceed instream concentration. The wastewater plant changed
contract laboratories at the end of 2013. This change was due to continuing problems
with the accuracy of the test results. In changing laboratories, the preservation/de-
chlorination process for cyanide also changed. Since changing laboratories, results for

cyanide for the past 24 months have been below detection. We feel that the cyanide
detections prior to 2014 were due to false positives due to de -chlorination issues and/or
laboratory problems. We request that the cyanide monitoring and limits be removed from
the permit.
C. Monitoring for Total Thallium was added to the permit based on the Reasonable Potential
Analysis (RPA). Our review of the Priority Pollutant Analysis (PPA) results show that
all results were below detection with the exception of one result which was equal to the
detection level. We don't feel that one result that is equal to the detection level should
warrant additional monitoring. We request that the monitoring requirement for thallium
be removed from the permit.
D. Monitoring for Total Phenolic Compounds were added to the permit based on the RPA.
In comparing the laboratory results with the reported results, it was discovered that the
unit conversion was not done. As stated above, there was a change in laboratories and
the previous laboratory reported Phenols in ug/Ls. The DMR had reporting limits of
mg/L and the conversion was not made. For the years 2011 and 2010 the Total Phenolic
Compounds were reported from the laboratory as 13 ug/L and 7.7 ug/L and reported on
the DMRs as 13 mg/L and 7.7 mg/L. We have attached the laboratory report for your
review. If the phenolic compounds were reported in the proper units, it's our belief that
the RPA results are in error and no further monitoring is required except in the PPAs.
We request that the monitoring requirement for Total Phenolic Compounds be removed
from the permit.
E. Monitoring for copper and zinc remain in the new permit. One of the methods the
Division uses to control copper and zinc is through the whole -effluent toxicity program.
The plant has consistently passed the toxicity tests for over ten years. Using the available
on-line calculator from NC DWR, we estimated the possible copper limit as 10.4 ug/L
and the zinc limit as 167.6 ug/L. We realize that we have had multiple times in which the
copper limit would have been exceeded. The highest zinc concentration over the last four
years has been 91 ug/L which is half the expected limit. Based upon our record on
passing toxicity and the test results, we again ask that monitoring for copper and zinc be
removed from the permit.
We thank you for your time and efforts. If you have any questions or comments, please contact
Bill Perkinson, Public Works Director, at 252/425-5334.
Sincerely,
Robert Davie, Town Administrator
Town of Warrenton

0
a
Page 1 of 4
Lob Location R'
NCNVW Cert.#: 067 NC/DW Cert.#: 37731
6701 Conference Dr, Raleigh, NC 27607
Ph: [phone] Fax: [phone]
`J`MiTEST
Laboratory Report
Lob Location 'C'
NCNVW Cert.#: 103 NC/DW Cert.#: 37733
6300 Ramada Dr, Suite C2, Clemmons, NC 27012
Ph: [phone] Fax: [phone]
iran-ww>*asn tis+-r.:!r��arr���wv.��SEu4�cx �rr�..yrnv�w.•sx+rsu�r.-1M-.ra-r—.a +t
Project No.:01
Project ID: Effluent Pollutant Scan
--- Prepared for ---
Bill Perkinson
Warrenton WWTP, Town of
Corner of Market & Bragg
P.O. Box 281
Warrenton, NC 27589
Lab Location 'W'
NCNVW Cert.#: 075 NC/DW Cert.#: 37721
6624 Gordon Rd, Unit G, Wilmington, NC 28411
Ph: [phone] Fax: [phone]
Report Date: 7/2/2010
Date Received: 6/9/2010
Work Order #:
Cust. Code:
Cust. P.O.#:
1006-00614
WA1777
No. Sample ID
001 Effluent
Date Sampled
6/9/2010
Time Sampled
8:02
Matrix
WW
Sample Type Condition
Composite 4 +/- 2 deg C
Test Performed
Method
Results
Lab LocAnazed
Date Time Qualifier
Ammonia
Nitrate -Nitrite
Total Kjeldahl Nitrogen
Total Phosphorus
Total Dissolved Solids
TOTAL HARDNESS (WW)
Calcium
Magnesium
Total Hardness Calculation
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
• Mercury
Nickel
Selenium
Silver
Thallium
Zinc
EPA 350.1
EPA 353.2
EPA 351.2
EPA 365.4
EPA 160.1
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 245.1
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
<0.02 mg/L as N
16.5 mg/L as N
0.94 mg/L
0.35 mg/L
388 mg/L
49.0 mg/L
2.87 mg/L
134 mg/L
<0.003 mg/L
<0.005 mg/L
<0.002 mg/L
<0.005 mg/L
<0.010 mg/L
<0.010 mg/L
<0.005 mg/L
<0.2 ug/L
<0.010 mg/L
<0.002 mg/L
<0.010 mg/L
0.001 mg/L
0.052 mg/L
R 6/15/10 9:00
R 6/15/10 12:54
R 6/16/10 13:20
R 6/16/10 12:53
R 6/10/10 11:18
R 0:00
R 6/14/10 12:08
R 6/14/10 12:08
R 6/14/10 12:08
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/15/10 8:35
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
R 6/11/10 12:06
No. Sample ID
002 Effluent
Date Sampled
6/9/2010
Time Sampled
10:35
Matrix
WW
Sample Type
Grab
Condition
4+1-2deg C
Test Performed
Method
Results
Lab LocAnazed
Date Time Qualifier
Oil & Grease
Cyanide
Phenols w/chloroform extr.
Volatile TTOs by GC/MS
EPA 1664A
EPA 335.2/335.3
SM 510A-B
<5.0 mg/L
<0.005 mg/L
7.7 ug1L
R 6/15/10 8:00
R 6/16/10 8:45
R 6/11/10 8:50
R 6/10/10 10:07

0
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J3oTEST
Page 1 of 4
Laboratory Report
_.__.__.... lab Location 'R'
NC/WW Cert.#: 067 NC/DW Cert.#: 37731 r
6701 Conference Dr, Raleigh, NC 27607
Ph: [phone] Fax: [phone]
Lab Location 'C'
NC/WW Cert.#: 103 NC/DW Cert.#: 37733
6300 Ramada Dr, Suite C2, Clemmons, NC 27012
Ph: [phone] Fax: [phone]
Project No.:01
Project ID: Effluent Pollutant Scan
--- Prepared for ---
Bill Perkinson
Warrenton WWTP, Town of
Corner of Market & Bragg
P.O. Box 281
Warrenton, NC 27589
Lob Location 'W'
NC/WW Cert.#: 075 NC/DW Cert.#: 37721
6624 Gordon Rd, Unit G, Wilmington, NC 28411
Ph: [phone] Fax: [phone]
Report Date: 10/20/2011
Date Received: 9/15/2011
Work Order #: 1109-01057
Cust. Code:
Cust. P.O.#:
WA1777
No. Sample ID
001 Effluent
Date Sampled Time Sampled
9/15/2011 12:43
Matrix
WW
Sample Type Condition
Composite 4 +1- 2 deg C
Test Performed
Method
Results
Ana
Lab Loc Time Qualifier
Ammonia
Nitrate -Nitrite
Total Kjeldahl Nitrogen
Total Phosphorus
Total Dissolved Solids
TOTAL HARDNESS (WW)
Calcium
Magnesium
Total Hardness Calculation
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury
Nickel
Selenium
Silver
Thallium
Zinc
EPA 350.1
EPA 353.2
EPA 351.2
EPA 365.4
EPA 160.1
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 245.1
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
EPA 200.8
<0.02 mg/L as N
16.0 mg/L as N
0.71 mg/L
2.71 mg/L
378 mg/L
72.0 mg/L
5.60 mg/L
203 mg/L
<0.002 mg/L
<0.005 mg/L
<0.002 mg/L
<0.005 mg/L
<0.010 mglL
<0.010 mg/L
<0.005 mg/L
<0.2 ug/L
<0.010 mg/L
<0.002 mg/L
<0.010 mg/L
<0.001 mg/L
0.055 mg/L
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
9/20/11
9/20/11
9/21/11
9/21/11
9/21/11
9/21/11
9/21/11
9/21/11
9/20/11
9/20/11
9/20/11
9/20/11
9/20/11
9/20/11
9/20/11
9/22/11
9/20/11
9/20/11
9/20/11
9/20/11
9/20/11
11:30
10:00
16:00
8:38
11:10
0:00
10:56
10:56
10:56
17:36
17:36
17:36
17:36
17:36
17:36
17:36
15:39
17:36
17:36
17:36
17:36
17:36
No. Sample ID
002 Effluent
Date Sampled Time Sampled
9/15/2011 12:49
Matrix
VVW
Sample Type
Grab
Condition
4+/-2deg C
Test Performed
Method
Results
Lab Loc uate Time Qualifier
Oil & Grease
Cyanide
Phenols w/chloroform extr.
Volatile TTOs by GC/MS
EPA 1664A
EPA 335.2/335.3
SM 510A-B
<5.0 mg/L
<0.005 mg/L
13.0 ug/L
R 9/21/11 16:00
R 9/19/11 15:00
R 9/23/11 8:41
R 9/16/11 7:06