NC0020834_Fact Sheet_20210331

Fact Sheet
NPDES Permit No. NC0020834
Permit Writer/Email Contact Nick Coco,[e-mail]:
Date: October 6,2020
Division/Branch:NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑X Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification(Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers,EPA Form 2A or 2D requirements,Engineering Alternatives Analysis,Fee
• For Existing Dischargers(POTW),EPA Form 2A, 3 effluent pollutant scans,4 2nd species WET
tests.
• For Existing Dischargers(Non-POTW),EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name: Town of Warrenton/Warren County Wastewater Treatment Plant
(WWTP)
Applicant Address: PO Box 281,Warrenton,NC 27589
Facility Address: 738 US Highway 401 South,Warrenton,NC 27589
Permitted Flow: 2.0 MGD
Facility Type/Waste: MAJOR Municipal; 100% domestic
Facility Class: Grade IV Biological Water Pollution Control System
Treatment Units: 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
Pretreatment Program(Y/N) N
County: Warren
Region Raleigh
Briefly describe the proposed permitting action and facility background: The Town of Warrenton has
applied for an NPDES permit renewal at 2.0 MGD for the Warren County WWTP. This facility serves a
population of approximately 2,700 residents across the Towns of Warrenton and Norlina,as well as Soul
City. Treated domestic wastewater is discharged into Fishing Creek,a class C-NSW water in the Tar-
Pamlico River Basin. The facility has a primary Outfall 001.
During the 2016 renewal,the facility was classified as Grade III.However,per 15A NCAC 08G.0302(c)
and(f),the facility has been reclassified as a Grade IV facility.
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2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s): Outfall 001 -Fishing Creek
Stream Index: 28-79-(1)
Stream Classification: C;NSW
Drainage Area(mi2): 51.9
Summer 7Q10(cfs) 1
Winter 7Q10(cfs): 1
30Q2(cfs): 8.9
Average Flow(cfs): 46.7
IWC(%effluent): 76
303(d)listed/parameter: No
Subject to TMDL/parameter: Yes- State wide Mercury TMDL implementation.
Subbasin/HUC: 03-03-04/03020102
USGS Topo Quad: B26NW Warrenton,NC
3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of September 2016 through September
2020.
Table 1. Effluent Data Summary Outfall 001
Parameter Units Average Max Min Permit Limit
Flow MGD 0.45 2.849 0.109 MA 2.0
Total Monthly Flow MG/month 13.7 19.356 9.425
BOD(summer) mg/1 2.5 20 2 WA 13.5
MA 9.0
BOD(winter) mg/1 2.9 1 5 2 WA 27.0
MA 18.0
TSS mg/1 2.9 2 WA 45.0
MA 30.0
NH3N(summer) mg/1 0.12 1.z, 0.1 WA 6.0
MA 2.0
NH3N(winter) mg/1 0.11 0.7 0.01 WA 12.0
MA 4.0
DO mg/1 8.9 14.76 5.98 DA> 5 mg/1
(geometric)
Fecal coliform #/100 ml (geomean) 600 1 WA 400
16.7 MA 200
Temperature ° C 18.1 28.8 2.7
pH SU 6.9 7.82 6 6.0 <pH<9.0
TRC µg/1 10.2 20 2 DM 22
Total Cyanide 1.1.g/1 6.3 16 <5 DM 28.0
MA 6.6
Total Copper µg/1 25.8 67 17
Total Zinc µg/1 88.8 310 27
Total Phenolic Compounds mg/1 3.1 35 0.01
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Total Thallium µg/1 20.4 25 <20
Total Mercury ng/1 <200 <200 1.35
TKN mg/1 0.4 7.06 0.02
NO2+NO3 mg/1 26.6 49.9 6.67
TN mg/1 26.8 49.9 0.2
TN Load lb/yr 31,262 36,583 16,840 28,523
TP mg/1 2.0 5.11 0.02
TP Load lb/yr 2,320 2,795 1,448 5,155
MA-Monthly Average,WA-Weekly Average,DM-Daily Maximum,DA-Daily Average,QA-
Quarterly Average
4. Instream Data Summary
Instream monitoring may be required in certain situations,for example: 1)to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow;2)to
verify model predictions for outfall diffuser; 3)to provide data for future TMDL;4)based on other
instream concerns. Instream monitoring may be conducted by the Permittee,and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: The current permit requires instream monitoring for dissolved oxygen,fecal coliform and
temperature Upstream 100 feet of the outfall and downstream of the outfall at NCSR 1600. The Town is a
member of the Tar-Pamlico River Basin Association and their instream requirements are provisionally
waived as long as they maintain membership.As such, data from September 2016 through September
2020 were observed from TPBA monitoring station 04300000,located upstream of the facility,and
station 04400500,located downstream of the facility. The data has been summarized in Table 2 below.
Table 2. Instream Monitoring Coalition Data Summary
04300000 Upstream 04400500 Downstream
Parameter Units
Average Max Min Average Max Min
DO mg/1 7.7 13.6 4.9 8.5 13.3 5.1
Fecal #/100m1 (geomean) 510 20 (geomean) 450 15
Coliform 56.2 74.1
Temperature ° C 17.1 25.9 2 17.3 26.6 2.4
Students t-tests were run at a 95%confidence interval to analyze relationships between instream
samples.A statistically significant difference is determined when the t-test p-value result is<0.05
The downstream temperature did not exceed 32 degrees Celsius [per 15A NCAC 02B .0211 (18)]. The
temperature differential was greater than 2.8 degrees Celsius on no occasion during the period reviewed.
It was concluded that no statistically significant difference between upstream and downstream
temperature exists.
Downstream DO did not drop below 5 mg/L [per 15A NCAC 02B .0211 (6)] during the period reviewed.
It was concluded that no significant difference between upstream and downstream DO exists.
The geometric mean for fecal coliform did not exceed 200/100mL downstream of the facility [per 15A
NCAC 02B .0211 (7)] during the period reviewed.Fecal coliform was reported at levels greater than
Page 3 of 13

400/100m1 in fewer than 20% of samples taken downstream during the period reviewed. It was concluded
that no significant difference between upstream and downstream fecal coliform exists.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (Y/N): Y
Name of Monitoring Coalition: Tar-Pamlico River Basin Association
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported one total
cyanide limit violation resulting in enforcement in 2018.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 18 of 18 quarterly chronic toxicity tests as well as 4 of 4 second species
toxicity tests from March 2016 to June 2020.
Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in July 2020 reported that the facility was in compliance with NPDES permit NC0020834.
6. Water Quality-Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206,the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow(acute Aquatic Life); 7Q10 streamflow(chronic Aquatic
Life;non-carcinogen HH); 30Q2 streamflow(aesthetics); annual average flow(carcinogen,HH).
If applicable, describe any other dilution factors considered(e.g., based on CORMIX model results):NA
If applicable, describe any mixing zones established in accordance with 1SA NCAC 2B.0204(b): NA
Oxygen-Consuming Waste Limitations
Limitations for oxygen-consuming waste (e.g.,BOD)are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen(DO)water quality standard. Secondary TBEL limits
(e.g.,BOD=30 mg/1 for Municipals)may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: The existing
limitations for BOD are based on the results of a 1985 Level B model.No changes are proposed.
Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/1(summer)and 1.8 mg/1(winter).Acute ammonia limits are derived from chronic criteria,
utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non-Municipals.
Page 4 of 13

Limitations for Total Residual Chlorine(TRC) are based on the NC water quality standard for protection
of aquatic life (17 ug/1)and capped at 28 ug/1(acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/1 are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: The current
permit sets a daily maximum limit for TRC at 22 ug/L. The TRC limit has been reviewed in the attached
WLA and found to be protective. There are no proposed changes for TRC.
The existing limitations for ammonia are based on the results of a 1985 Level B model. Ammonia-
nitrogen limits have been reviewed in the attached WLA.Based on IWC-based calculations,summer and
winter ammonia monthly average limits have been changed to 1.3 mg/L and 2.3 mg/L,respectively. Per
an agreement with the EPA,the weekly average limit to monthly average limit ratio is 3:1 for ammonia.
As such, summer and winter ammonia weekly average limits have been changed to 3.9 mg/L and 6.9
mg/L,respectively.
Reasonable Potential Analysis(RPA)for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards,a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44(d)(i). The NC
RPA procedure utilizes the following: 1)95%Confidence Level/95%Probability;2)assumption of zero
background; 3)use of V2 detection limit for"less than"values;and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6,2016,NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards,dated June 10,2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between September
2016 through September 2020 Pollutants of concern included toxicants with positive detections and
associated water quality standards/criteria. Based on this analysis,the following permitting actions are
proposed for this permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality-based
effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable
water quality standards/criteria: Total Copper, Total Cyanide, Total Thallium
• Monitoring Only. The following parameters will receive a monitor-only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria,
but the maximum predicted concentration was>50%of the allowable concentration: Total Zinc
• No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria and the maximum predicted concentration was<50%of the allowable
concentration: Total Phenolic Compounds
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern. (PPAs from 2015,2016 and 2017)
o The following parameter(s)will receive a water quality-based effluent limit(WQBEL)
with monitoring,since as part of a limited data set,two samples exceeded the allowable
discharge concentration: NA
o The following parameter(s)will receive a monitor-only requirement, since as part of a
limited data set,one sample exceeded the allowable discharge concentration: N/A
o The following parameters will not receive a limit or monitoring, since they did not
demonstrate reasonable potential to exceed applicable water quality standards/criteria and
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the maximum predicted concentration was<50%of the allowable concentration: Total
Arsenic,Total Beryllium,Total Cadmium,Total Chromium,Total Lead, Total Nickel,
Total Selenium,Total Silver
Per 2018 Thallium review: Staff of the Classifications and Standards/Rules Review Branch recommend
the use of the federal MCL of 2 µg/L for thallium in all surface waters of the state,as allowed in 15A
NCAC 02B,until such time that more substantive information becomes available [See attached 2018
Thallium Memo].
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity(WET)have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance,all NPDES permits
issued to Major facilities or any facility discharging "complex"wastewater(contains anything other than
domestic waste)will contain appropriate WET limits and monitoring requirements,with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits,using single concentration screening tests,with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: The permit requires quarterly chronic toxicity testing at
76% effluent concentration.No changes are proposed.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply
with EPA's mercury fish tissue criteria(0.3 mg/kg)for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year(81 lb/year),and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources(-2%of total load),the TMDL emphasizes mercury minimization plans(MMPs)for point source
control. Municipal facilities>2 MGD and discharging quantifiable levels of mercury(>1 ng/1)will
receive an MMP requirement. Industrials are evaluated on a case-by-case basis, depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/1) and/or if any individual value exceeds a TBEL
value of 47 ng/1.
Table 3.Mercury Effluent Data Summary(2.0 MGD)
2015 2017 2018 2019
#of Samples 1 1 1 1
Annual Average Conc.ng/L 2.3 1.4 3.54 4.26
Maximum Conc.,ng/L 2.3 1.4 3.54 4.36
TBEL,ng/L 47
WQBEL,ng/L 15.9
Page 6 of 13

Describe proposed permit actions based on mercury evaluation: During the review period,the Town
reported numerous total mercury samples as non-detect at less than 200 ng/L.For the sake of this review,
those samples were omitted from the data set. The Town shall use EPA Method 1631E for all total
mercury sampling.
Since no annual average mercury concentration exceeded the WQBEL,and no individual mercury sample
exceeded the TBEL,no mercury limit is required. Since the facility is 2 MGD in design capacity and
reported multiple quantifiable levels of total mercury,a mercury minimization plan(MMP)is required.
The MMP requirement has been maintained in the permit.
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit:
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").
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 TP Load
(lb/yr) (lb/yr)
NC0030317 City of Rocky Mount Tar River Regional WWTP 299,491 54,124
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 WRF 19,538 3,531
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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 apply for such a
permit,and the Division initiated discussions with the members on that approach in 2012.
The Tar-Pamlico Nutrient Strategy is covered under 15A NCAC 02B .0730.
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs:NA
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody:NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H.0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: As total copper and total
thallium demonstrated reasonable potential to exceed the facility's allowable discharge concentrations
based on state surface water standards,monthly average and daily maximum limits have been put in the
permit for total copper and total thallium.After discussing the limits with the Permittee,the Permittee
requested a schedule of compliance to provide time to locate issues and come into compliance with the
new limits.A 3-year compliance schedule has also been put in the permit. Within 1 year of the permit's
effective date,the Permittee shall submit to DWR an Action Plan for Division approval, summarizing the
strategy or actions to be taken to achieve compliance with the total copper and total thallium limitations.
The plan will include specific dates for completion or implementation of each action. Within 2 years of
the permit's effective date,the Permittee shall submit a report to the Division summarizing actions taken
in accordance with the Action Plan. The Town shall achieve compliance with total copper and total
thallium limitations within 3 years of the permit's effective date.
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e)and 15A NCAC 2B.0226 for this permit renewal:NA
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7. Technology-Based Effluent Limitations (TBELs)
Municipals(if not applicable,delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/l
BOD5/TSS for Monthly Average, and 45 mg/l for BOD5/TSS for Weekly Average). YES
If NO,provide a justification for alternative limitations (e.g., waste stabilization pond). NA
Are 85%removal requirements for BOD5/TSS included in the permit? YES
If NO,provide a justification (e.g., waste stabilization pond). NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases,existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results:NA
9. Antibacksliding Review:
Sections 402(o)(2)and 303(d)(4)of the CWA and federal regulations at 40 CFR 122.44(1)prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit,with some exceptions where limitations
may be relaxed(e.g.,based on new information,increases in production may warrant less stringent TBEL
limits,or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit(YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated:NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500;2)
NPDES Guidance,Monitoring Frequency for Toxic Substances(7/15/2010 Memo); 3)NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo);4)Best
Professional Judgement(BPJ). Per US EPA(Interim Guidance, 1996),monitoring requirements are not
considered effluent limitations under Section 402(o)of the Clean Water Act,and therefore anti-
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring,refer to Section 4.
The Town of Warrenton was granted monitoring frequency reductions for BOD5,Total Suspended Solids,
NH3-N and Fecal Coliform with their 2016 NPDES permit renewal based on DWR Guidance Regarding
the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally Performing Facilities. The
Town has requested continuation of this monitoring frequency reduction in their 2019 NPDES renewal
Page 9 of 13

application. The last three years of the facility's data for these parameters have been reviewed in
accordance with the criteria outlined in the guidance. 2/week monitoring for BOD5,Total Suspended
Solids,NH3-N and Fecal Coliform has been maintained.
As the Warren County WWTP is a Grade IV facility,monitoring frequencies for pH,total residual
chlorine and dissolved oxygen have been increased from 3/week to daily,per 15A NCAC 02B .0508.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21,2015. Effective
December 21,2016,NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs)electronically. While NPDES regulated facilities would initially be required to submit additional
NPDES reports electronically effective December 21,2020,EPA extended this deadline from December
21,2020,to December 21,2025. The current compliance date,effective January 4,2021,was extended as
a final regulation change published in the November 2,2020 Federal Register This permit contains the
requirements for electronic reporting,consistent with Federal requirements.
12.Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes 2.0 MGD
Parameter Current Permit Proposed Change Basis for Condition/Change
Flow MA 2.0 MGD No change 15A NCAC 2B .0505
Total Monthly Flow Monitor and No change For calculation of TN and TP
Report Monthly Loads
BOD5 Summer: No change WQBEL. 1985 Level B model.
MA 9.0 mg/1 15A NCAC 2B; DWR Guidance
WA 13.5 mg/1 Regarding the Reduction of
Winter: Monitoring Frequencies in NPDES
MA 18.0 mg/1 Permits for Exceptionally
WA 27.0 mg/1 Performing Facilities
2/week monitoring
NH3-N Summer: No change to WQBEL.2020 WLA. 15A NCAC
MA 2.0 mg/1 monitoring frequency 2B; DWR Guidance Regarding the
WA 6.0 mg/1 Reduction of Monitoring
Winter: Summer: Frequencies in NPDES Permits for
MA 4.0 mg/1 MA 1.3 mg/1 Exceptionally Performing
WA 12.0 mg/1 WA 3.9 mg/1 Facilities
2/week monitoring Winter:
MA 2.3 mg/1
WA 6.9 mg/1
TSS MA 30 mg/1 No change TBEL. Secondary treatment
WA 45 mg/1 standards/40 CFR 133 / 15A
2/week monitoring NCAC 2B .0406; DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
Fecal coliform MA 200/100m1 No change WQBEL. State WQ standard, 15A
WA 400/100m1 NCAC 2B; DWR Guidance
Page 10 of 13

2/week monitoring Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
DO DA> 5 mg/1 No change to limits WQBEL. State WQ standard, 15A
Monitor and Increase Monitor and NCAC 2B .0200; Surface Water
Report 3/week Report frequency to Monitoring, 15A NCAC 2B. 0500
daily
TRC DM 22 ug/L No change to limits WQBEL. State WQ standard, 15A
Monitor and Increase Monitor and NCAC 2B .0200; Surface Water
Report 3/week Report frequency to Monitoring, 15A NCAC 2B. 0500
daily
Temperature Monitor and No change Surface Water Monitoring, 15A
Report Daily NCAC 2B. 0500
pH 6—9 SU No change to limits WQBEL. State WQ standard, 15A
Monitor and Increase Monitor and NCAC 2B; Surface Water
Report 3/week Report to daily Monitoring, 15A NCAC 2B. 0500
TKN Monitor and No change For calculation of Total Nitrogen
Report Weekly
NO2+NO3 Monitor and No change For calculation of Total Nitrogen
Report Weekly
Total Nitrogen Monitor and No change Tar-Pamlico Nutrient Management
Report Weekly Strategy
T15A NCAC 2B .0730
TN Load Monitor and No change WQBEL.Tar-Pamlico Nutrient
Report Monthly Management Strategy
(as lb/mo) T15A NCAC 2B .0730
Annual TN mass
limit of 28,523
lb/yr
Total Phosphorous Monitor and No change Tar-Pamlico Nutrient Management
Report Weekly Strategy
T15A NCAC 2B .0730
TP Load Monitor and No change WQBEL.Tar-Pamlico Nutrient
Report Monthly Management Strategy
(as lb/mo) T15A NCAC 2B .0730
Annual TP mass
limit of 5,155 lb/yr
Total Cyanide MA 6.6 ug/L No change WQBEL.Based on RPA; RP
DM 28.0 ug/L shown—apply monthly monitoring
Monitor and with limit
Report Monthly
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Total Copper Monitor and MA 39.1 ug/L WQBEL.Based on RPA; RP
Report Quarterly DM 58.9 ug/L shown—apply monthly monitoring
Monitor and Report with limit
Monthly
3-year compliance
schedule
Total Zinc Monitor and No change Based on RPA;No RP, Predicted
Report Quarterly Max > 50%of Allowable Cw-
apply Quarterly Monitoring
Total Phenolic Monitor and Remove monitoring Based on RPA;No RP, Predicted
Compounds Report Quarterly requirement Max<50%of Allowable Cw-No
Monitoring required
Total Thallium Monitor and MA 2.6 ug/L WQBEL.Based on RPA; RP
Report Quarterly Monitor and Report shown—apply monthly monitoring
Monthly with limit
3-year compliance
schedule
Total Mercury Monitor and Remove monitoring Based on 2012 Statewide Mercury
Report Quarterly requirement TMDL Implementation review
Total Hardness No requirement Quarterly monitoring Hardness-dependent dissolved
Upstream and in metals water quality standards
Effluent approved in 2016
Chronic Toxicity Chronic limit, No change WQBEL. No toxics in toxic
76% effluent amounts. 15A NCAC 2B
Effluent Pollutant Scan Three times per No change 40 CFR 122
permit cycle
Mercury Minimization MMP Special No change Consistent with 2012 Statewide
Plan(MMP) Condition Mercury TMDL Implementation;
Municipality with Q<2 MGD
Electronic Reporting Electronic No change In accordance with EPA Electronic
Reporting Special Reporting Rule 2015.
Condition
MGD—Million gallons per day,MA- Monthly Average,WA—Weekly Average, DM—Daily Max, QA
—Quarterly Average,DA—Daily Average,AA—Annual Average
13. Public Notice Schedule:
Permit to Public Notice: December 15,2020; affidavit received 3/23/2021
Per 15A NCAC 2H .0109& .0111,The Division will receive comments for a period of 30 days following
the publication date of the public notice.Any request for a public hearing shall be submitted to the
Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
Page 12 of 13

14. Fact Sheet Addendum (if applicable):
The draft was submitted to the Town of Warrenton, EPA Region IV, and the Division's Raleigh Regional
Office,Aquatic Toxicology Branch,Ecosystems Branch and Operator Certification Program for review.
No comments were received from any party.
Were there any changes made since the Draft Permit was public noticed(Yes/No):YES
If Yes, list changes and their basis below:
• As the Monitoring Coalition will not be conducting hardness sampling on behalf of the Permittee,
the footnote language in Section A.(1.)has been updated.
15. Fact Sheet Attachments (if applicable):
• RPA Spreadsheet Summary
• BOD and TSS Removal
• Monitoring Reduction Frequency Spreadsheet
• Dissolved Metals Implementation/Freshwater
• Waste Load Allocation Spreadsheet
• Mercury TMDL Spreadsheet
• Toxicity Summary
• Instream Monitoring Summary
• Renewal Application Addendum
• 2018 Thallium Memo
Page 13 of 13

Affidavit of Printer's Proof
NORTH CAROLINA
WARREN COUNTY'
I, Marisa Moseley,
North Carolina Environmental ManagemePublic nt Commission/NPDES{)nit ce
per WarrenpThe ublication office weekly newmanage1 of
1817 Mail Service Center,Raleigh,NC 17699.9617 Record, a
Notice of Intent to Issue a NPDES Wastewater Permit NC0020834 ation in the to newspa-
ton, Warren Count town of Warren-
North toJssn entalnManaton gement CommissionCarolina Y, and state of N
issue a NorthNPDES Carolina wastewater Environmental
discharge , attest that a legalNorth
Written commentsproposes to tied: action enti-
regarding the proposed permitto the)be accepted
fisted untill30
days after the publish date of this notice. Thepermit
wit)Director accepted Division
of Water Resources(DWR)ma hold a ring of NC ea significant degree of public interest.Please muailccommentts should
inform ti n
requests to DWR at the above address Interested CJ
may visit the DWR
at 512 N.Salisbury Street,Raleigh,NC 27604 to review information on fle. `
Additional information on NPDES permits and this notice may be found on our
website: http://deq,nc,gov/about/divisions/water_resources/water-resources-
permitshvastewater-branch/npdes-wastewater/public0-notices,or by
calling
[phone]. The Town of Warrenton(PO. Box 281, Warrenton, North
Carolina 27589]has requested renewal of NPDES
its Warren County Wastewater Treatmentpermit Warren 84 far
This facility discharges treated muniipal wastewater tolocated FishingCountyA true CO class NSW water in the Tar-Pamlico River Basin.Currently,BOp ammonia copy
of which is made
nitrogen, fecal water
in Creek, a this affidavit, did a pan of
pH, dissolved oxygen, total cyanide,total nitrogen Warren Record ' appear in the
loading,total phosphorous loading,total copper,and total thallium are said The
quality limited.This discharge may affect future allocations in this segment of in the following
Fishing Creek. SeCUtIVe Issues; COn-
Office Manager'
Warren County, North C
I certify that the Carolina
appearedabove person personally
,`�.,01�W ELO6"ii. edging to before
thatnh this day, acknowl-
edging
ing document. signed the forego_
,0p,Fl Y 0
_ —/ Z=
O
•
cs y day of e
raj ��� > 20 . 1
''„��i�'QRF�EN �'O`%,` Notary Public47,
ICL C' Q
II,fltllll���,
My commission expires: r --"

Affidavit of Printer's Proof
NORTH CAROLINA
WARREN COUNTY'
I, Marisa Moseley,
North Carolina Environmental ManagemePublic nt Commission/NPDES{)nit ce
per WarrenpThe ublication office weekly newmanage1 of
1817 Mail Service Center,Raleigh,NC 17699.9617 Record, a
Notice of Intent to Issue a NPDES Wastewater Permit NC0020834 ation in the to newspa-
ton, Warren Count town of Warren-
North toJssn entalnManaton gement CommissionCarolina Y, and state of N
issue a NorthNPDES Carolina wastewater Environmental
discharge , attest that a legalNorth
Written commentsproposes to tied: action enti-
regarding the proposed permitto the)be accepted
fisted untill30
days after the publish date of this notice. Thepermit
wit)Director accepted Division
of Water Resources(DWR)ma hold a ring of NC ea significant degree of public interest.Please muailccommentts should
inform ti n
requests to DWR at the above address Interested CJ
may visit the DWR
at 512 N.Salisbury Street,Raleigh,NC 27604 to review information on fle. `
Additional information on NPDES permits and this notice may be found on our
website: http://deq,nc,gov/about/divisions/water_resources/water-resources-
permitshvastewater-branch/npdes-wastewater/public0-notices,or by
calling
[phone]. The Town of Warrenton(PO. Box 281, Warrenton, North
Carolina 27589]has requested renewal of NPDES
its Warren County Wastewater Treatmentpermit Warren 84 far
This facility discharges treated muniipal wastewater tolocated FishingCountyA true CO class NSW water in the Tar-Pamlico River Basin.Currently,BOp ammonia copy
of which is made
nitrogen, fecal water
in Creek, a this affidavit, did a pan of
pH, dissolved oxygen, total cyanide,total nitrogen Warren Record ' appear in the
loading,total phosphorous loading,total copper,and total thallium are said The
quality limited.This discharge may affect future allocations in this segment of in the following
Fishing Creek. SeCUtIVe Issues; COn-
Office Manager'
Warren County, North C
I certify that the Carolina
appearedabove person personally
,`�.,01�W ELO6"ii. edging to before
thatnh this day, acknowl-
edging
ing document. signed the forego_
,0p,Fl Y 0
_ —/ Z=
O
•
cs y day of e
raj ��� > 20 . 1
''„��i�'QRF�EN �'O`%,` Notary Public47,
ICL C' Q
II,fltllll���,
My commission expires: r --"

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information Table 2. Parameters of Concern
❑ CHECK IF HQW OR ORW WQS Name WQS Type Chronic Modifier Acute PQL Units
Facility Name Warren County WWTP Par01 Arsenic Aquactic Life C 150 FW 340 ug/L
WWTP/WTP Class IV Par02 Arsenic Human Health C 10 HH/WS N/A ug/L
Water Supply
NPDES Permit NC0020834 Par03 Beryllium Aquatic Life NC 6.5 FW 65 ug/L
Outfall 001 Par04 Cadmium Aquatic Life NC 1.8991 FW 12.8472 ug/L
Flow, Qw(MGD) 2.000 E Par05 Chlorides Aquatic Life NC 230 FW
Receiving Stream Fishing Creek Par064 Chlorinated Phenolic Compounds Water Supply NC 1 A ug/L
HUC Number 03020102 Par07 * Total Phenolic Compounds Aquatic Life NC 300 A ug/L
Stream Class Par08 Chromium III Aquatic Life NC 418.5175 FW 3301.4215 ug/L
C;NSW
❑Apply WS Hardness WQC Par09 Chromium VI Aquatic Life NC 11 FW 16 pg/L
7Q10s (cfs) 1.000 « Par10 Chromium, Total Aquatic Life NC N/A FW N/A pg/L
7Q1 Ow(cfs) 1.00 « Par11 Copper Aquatic Life NC 29.5974 FW 46.4071 ug/L
30Q2 (cfs) 8.90 « Par12 Cyanide Aquatic Life NC 5 FW 22 10 ug/L
QA(cfs) 46.70 « Par13 Fluoride Aquatic Life NC 1,800 FW ug/L
1Q10s (cfs) 0.84 Par14 Lead Aquatic Life NC 16.3225 FW 433.3813 ug/L
Effluent Hardness 147.5 mg/L (Avg) Par15 Mercury Aquatic Life NC 12 FW 0.5 ng/L
Upstream Hardness _ 25 mg/L (Avg) Par16 Molybdenum Human Health NC 2000 HH ug/L
—
Combined Hardness Chronic 117.62 mg/L Par17 Nickel Aquatic Life NC 138.0017 FW 1276.0166 pg/L
Combined Hardness Acute 121.38 mg/L Par18 Nickel Water Supply NC 25.0000 WS N/A pg/L
Data Source(s) Per 2018 Thallium review: Staff of the Classifications Par19 Selenium Aquatic Life NC 5 FW 56 ug/L
LI CHECK TO APPLY MODEL and Standards/Rules Review Branch recommend Par20 Silver Aquatic Life NC 0.06 FW 4.4892 ug/L
the use of the federal MCL of 2 pg/L for thallium in all
surface waters of the state, as allowed in 15A NCAC Par21 Zinc Aquatic Life NC 470.6972 FW 479.4976 ug/L
02B, until such time that more substantive Par22 Thallium Human Health NC 2 HH pg/L
information becomes available. Par23
Par24
20834 RPA, input
12/7/2020

REASONABLE POTENTIAL ANALYSIS
H1 H2
Use"PASTE SPECIAL. Use"PASTE SPECIAL.
Effluent Hardness Values"then"COPY" Upstream Hardness Values"then"COPY"
. Maximum data . Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/17/2015 136 136 Std Dev. 27.3435 1 DEFAULT 25 25 Std Dev. N/A
2 3/14/2017 138 138 Mean 147.5000 2 Mean 25.0000
3 7/9/2018 128 128 C.V. (default) 0.6000 3 C.V. 0.0000
4 12/12/2019 188 188 n 4 4 n 1
5 10th Per value 130.40 mg/L 5 10th Per value 25.00 mg/L
6 Average Value 147.50 mg/L 6 Average Value 25.00 mg/L
7 Max. Value 188.00 mg/L 7 Max. Value 25.00 mg/L
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
- 1 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Use"PASTE SPECIAL.
Arsenic Values"then"COPY"
. Maximum data
points=58
Date Data BDL=1/2DL Results
1 9/17/2015 < 10 5 Std Dev. 0.0000
2 3/14/2017 < 10 5 Mean 5.0000
3 7/9/2018 < 10 5 C.V. (default) 0.6000
4 12/12/2019 < 10 5 n 4
5
6 Mult Factor = 2.59
7 Max. Value 5.0 ug/L
8 Max. Pred Cw 13.0 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, data
-2 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par03 Par04
Use"PASTE SPECIAL. Use"PASTE SPECIAL.
Beryllium Values"then"COPY" Cadmium Values"then"COPY"
. Maximum data . Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/17/2015 < 5 2.5 Std Dev. 0.0000 1 9/17/2015 < 2 1 Std Dev. 0.0000
2 3/14/2017 < 5 2.5 Mean 2.5000 2 3/14/2017 < 2 1 Mean 1.0000
3 7/9/2018 < 5 2.5 C.V. (default) 0.6000 3 7/9/2018 < 2 1 C.V. (default) 0.6000
4 12/12/2019 < 5 2.5 n 4 4 12/12/2019 < 2 1 n 4
5 5
6 Mult Factor = 2.59 6 Mult Factor = 2.59
7 Max. Value 2.50 ug/L 7 Max. Value 1.000 ug/L
8 Max. Pred Cw 6.48 ug/L 8 Max. Pred Cw 2.590 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
-3 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par07 Par10
Use"PASTE SPECIAL. Use"PASTE SPECIAL.
Total Phenolic Compounds Values"then"COPY" Chromium, Total Values"then"COPY"
. Maximum data . Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/13/2016 35 35 Std Dev. 53.0166 1 9/22/2015 < 5 2.5 Std Dev. 0.0000
2 12/6/2016 70 70 Mean 28.5882 2 3/14/2017 < 5 2.5 Mean 2.5000
3 3/9/2017 < 10 5 C.V. 1.8545 3 7/9/2018 < 5 2.5 C.V. (default) 0.6000
4 6/6/2017 14 14 n 17 4 12/12/2019 < 5 2.5 n 4
5 9/19/2017 < 10 5 5
6 12/5/2017 12 12 Mult Factor = 2.23 6 Mult Factor = 2.59
7 3/6/2018 26 26 Max. Value 224.0 ug/L 7 Max. Value 2.5 pg/L
8 6/19/2018 15 15 Max. Pred Cw 499.5 ug/L 8 Max. Pred Cw 6.5 pg/L
9 9/27/2018 < 10 5 9
10 12/11/2018 14 14 10
11 3/19/2019 < 10 5 11
12 6/4/2019 < 10 5 12
13 9/10/2019 < 10 5 13
14 12/3/2019 < 10 5 14
15 3/5/2020 13 13 15
16 6/2/2020 28 28 16
17 9/17/2015 224 224 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
-4 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Pal Par12
Use"PASTE SPECIAL. Use"PASTE SPECIAL.
Copper Values"then"COPY" Cyanide
Values"then"COPY"
pp . Maximum data . Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/13/2016 23 23 Std Dev. 11.7820 1 5/2/2017 < 5 5 Std Dev. 2.3494
2 12/6/2016 21 21 Mean 25.2353 2 6/1/2017 < 5 5 Mean 5.76
3 3/9/2017 19 19 C.V. 0.4669 3 7/4/2017 < 5 5 C.V. 0.4080
4 6/6/2017 29 29 n 17 4 8/1/2017 < 5 5 n 58
5 9/19/2017 67 67 5 9/5/2017 < 5 5
6 12/5/2017 23 23 Mult Factor = 1.34 6 10/3/2017 < 5 5 Mult Factor = 1.00
7 3/6/2018 33 33 Max. Value 67.00 ug/L 7 11/2/2017 6 5 Max. Value 16.0 ug/L
8 6/19/2018 31 31 Max. Pred Cw 89.78 ug/L 8 12/5/2017 < 5 5 Max. Pred Cw 16.0 ug/L
9 9/27/2018 20 20 9 1/2/2018 7 5
10 12/11/2018 17 17 10 2/6/2018 < 5 5
11 3/19/2019 25 25 11 3/1/2018 7 5
12 6/4/2019 20 20 12 4/3/2018 8 5
13 9/10/2019 25 25 13 4/12/2018 9 5
14 12/3/2019 19 19 14 4/23/2018 9 5
15 3/5/2020 17 17 15 5/1/2018 13 13
16 6/2/2020 23 23 16 6/5/2018 5 5
17 9/22/2015 17 17 17 7/3/2018 5 5
18 18 8/7/2018 5 5
19 19 9/4/2018 5 5
20 20 10/2/2018 5 5
21 21 11/8/2018 6 5
22 22 12/7/2018 6 5
23 23 1/8/2019 16 16
24 24 1/22/2019 5 5
25 25 1/23/2019 9 5
26 26 1/29/2019 13 13
27 27 1/30/2019 10 10
28 28 1/31/2019 8 5
29 29 2/5/2019 12 12
30 30 2/15/2019 5 5
31 31 2/18/2019 10 10
32 32 2/26/2019 6 5
33 33 2/27/2019 7 5
34 34 2/28/2019 8 5
35 35 3/12/2019 6 5
36 36 3/19/2019 6 5
37 37 4/2/2019 8 5
38 38 5/2/2019 < 5 5
39 39 6/4/2019 < 5 5
40 40 7/2/2019 5 5
41 41 8/1/2019 5 5
42 42 8/13/2019 < 5 5
43 43 9/10/2019 5 5
44 44 10/1/2019 8 5
45 45 10/15/2019 < 5 5
46 46 10/17/2019 < 5 5
47 47 11/5/2019 < 5 5
48 48 12/3/2019 < 5 5
49 49 1/7/2020 < 5 5
50 50 2/6/2020 < 5 5
51 51 3/5/2020 < 5 5
52 52 4/2/2020 7 5
53 53 4/14/2020 < 5 5
54 54 4/16/2020 < 5 5
55 55 5/5/2020 < 5 5
56 56 6/2/2020 < 5 5
57 57 7/2/2020 < 5 5
58 58 8/6/2020 < 5 5
20834 RPA, data
-5 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par14 Par17 & Par18 Use"PASTE
Use"PASTE SPECIAL.
Values"then"COPY" SPECIAL-Values"
Lead . Maximum data Nickel then"COPY".
points=58 Maximum data
points=58
Date BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/22/2015 < 10 5 Std Dev. 0.0000 1 9/22/2015 < 10 5 Std Dev. 0.0000
2 3/14/2017 < 10 5 Mean 5.0000 2 3/14/2017 < 10 5 Mean 5.0000
3 7/9/2018 < 10 5 C.V. (default) 0.6000 3 7/9/2018 < 10 5 C.V. (default) 0.6000
4 12/12/2019 < 10 5 n 4 4 12/12/2019 < 10 5 n 4
5 5
6 Mult Factor = 2.59 6 Mult Factor = 2.59
7 Max. Value 5.000 ug/L 7 Max. Value 5.0 pg/L
8 Max. Pred Cw 12.950 ug/L 8 Max. Pred Cw 13.0 pg/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
-6 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par19 Use"PASTE Par20
SPECIAL-Values" Use"PASTE SPECIAL-
Selenium then"COPY". Silver Values"then"COPY".
Maximum data Maximum data points=
points=58 58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/22/2015 < 10 5 Std Dev. 0.0000 1 9/22/2015 < 5 2.5 Std Dev. 0.0000
2 3/14/2017 < 10 5 Mean 5.0000 2 3/14/2017 < 5 2.5 Mean 2.5000
3 7/9/2018 < 10 5 C.V. (default) 0.6000 3 7/9/2018 < 5 2.5 C.V. (default) 0.6000
4 12/12/2019 < 10 5 n 4 4 12/12/2019 < 5 2.5 n 4
5 5
6 Mult Factor = 2.59 6 Mult Factor = 2.59
7 Max. Value 5.0 ug/L 7 Max. Value 2.500 ug/L
8 Max. Pred Cw 13.0 ug/L 8 Max. Pred Cw 6.475 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
-7 - 12/7/2020

REASONABLE POTENTIAL ANALYSIS
Par21 Par22
Use"PASTE SPECIAL. Use"PASTE SPECIAL.
Zinc Values"then"COPY" Thallium Values"then"COPY"
. Maximum data . Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 9/13/2016 58 58 Std Dev. 70.8519 1 9/13/2016 < 20 10 Std Dev. 2.7045
2 12/6/2016 110 110 Mean 87.8824 2 12/6/2016 < 20 10 Mean 10.8929
3 3/9/2017 74 74 C.V. 0.8062 3 3/9/2017 < 20 10 C.V. 0.2483
4 6/6/2017 63 63 n 17 4 12/5/2017 < 20 10 n 14
5 9/19/2017 125 125 5 3/6/2018 20 20
6 12/5/2017 310 310 Mult Factor = 1.59 6 6/19/2018 < 20 10 Mult Factor = 1.21
7 3/6/2018 199 199 Max. Value 310.0 ug/L 7 9/27/2018 < 20 10 Max. Value 20.000000 pg/L
8 6/19/2018 45 45 Max. Pred Cw 492.9 ug/L 8 12/11/2018 < 20 10 Max. Pred Cw 24.200000 pg/L
9 9/27/2018 27 27 9 3/19/2019 < 20 10
10 12/11/2018 76 76 10 6/4/2019 < 20 10
11 3/19/2019 101 101 11 9/10/2019 < 20 10
12 6/4/2019 42 42 12 12/3/2019 < 20 10
13 9/10/2019 42 42 13 3/5/2020 < 20 10
14 12/3/2019 34 34 14 6/2/2020 < 25 12.5
15 3/5/2020 54 54 15
16 6/2/2020 61 61 16
17 9/22/2015 73 73 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
20834 RPA, data
-8 - 12/7/2020

Warren County WWTP > Outfall 001
NC0020834 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 2 MGD
MAXIMUM DATA POINTS = 58
Qw (MGD) = 2.0000 WWTP/WTP Class: IV COMBINED HARDNESS (mg/L)
1Q1OS (cfs) = 0.84 IWC% @ 1Q1OS = 78.68020305 Acute = 121.38 mg/L
7Q1OS (cfs) = 1.00 IWC% @ 7Q1OS = 75.6097561 Chronic = 117.62 mg/L
7Q1OW (cfs) = 1.00 IWC% @ 7Q1OW = 75.6097561
30Q2 (cfs) = 8.90 IWC% @ 30Q2 = 25.83333333
Avg. Stream Flow, QA (cfs) = 46.70 IW%C @ QA= 6.224899598
Receiving Stream: Fishing Creek HUC 03020102 Stream Class: C;NSW
PARAMETER NC STANDARDS OR EPA CRITERIA _1 REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION
TYPE Chronic Stapda d AcuteoCi n n # Det. Max Pred Cw Allowable Cw
Acute (FW): 432.1
Arsenic C 150 FW(7Q10s) 340 ug/L ________________________________________________
4 0 13.0 Chronic (FW): 198.4
C.V. (default) Max MDL = 10 ____ _____ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Arsenic C 10 HH/WS(Qavg) ug/L Note: n< 9 NO DETECTS Chronic (HH): 160.6 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set Max MDL = 10 Monitoring required
Acute: 82.61
Beryllium NC 6.5 FW(7Q10s) 65 ug/L 4 0 6.48 ____ _ ______ _____ _ _ _ _ _ _ _ _ _ _ _ _____
Note: n< 9 C.V. (default) Chronic: 8.60 All values reported non-detect < 5 ug/L- No
Limited data set NO DETECTS Max MDL = 5 Monitoring required
Acute: 16.328
Cadmium NC 1.8991 FW(7Q10s) 12.8472 ug/L 4 0 2.590 ____ _ ______ _____ _ _ _ _ _ _ _ _ _ _ _ _____
Note: n< 9 C.V. (default) Chronic: 2.512 All values reported non-detect <2 ug/L- No
Limited data set NO DETECTS Max MDL = 2 monitoring required.
Acute: NO WQS
Total Phenolic Compounds NC 300 A(30Q2) ug/L 17 10 499.5 ____ _ ____ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 1,161.3 No RP, Predicted Max< 50% of Allowable Cw- No
No value > Allowable Cw Monitoring required
Acute: 4,196.0
Chromium III NC 418.5175 FW(7Q10s) 3301.4215 µg/L 0 0 N/A -- _ _ ---- _ _
- -553.5--------------------------------
Chronic:
Acute: 20.3
Chromium VI NC 11 FW(7Q10s) 16 µg/L 0 0 N/A -- _ _ -----_ _
- --------------------------------
Chronic: 14.5
Chromium, Total NC µg/L 4 0 6.5 Max reported value =2.5 a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
Note: n<9 C.V. (default) allowable Cw for Cr VI.
Limited data set NO DETECTS Max MDL = 5
Acute: 58.98
Copper NC 29.5974 FW(7Q10s) 46.4071 ug/L 17 17 89.78 -- _ _ ---- ___
-3914--------------------------------
Chronic:- RP shown - apply Monthly Monitoring with Limit
1 value(s) >Allowable Cw
Acute: 28.0
Cyanide NC 5 FW(7Q10s) 22 10 ug/L 58 34 16.0
---_ _Chronic: ----- 6-6--------------------------------
RP shown - apply Monthly Monitoring with Limit
6 value(s) >Allowable Cw
20834 RPA, rpa
Page 1 of 2 12/7/2020

Warren County WWTP > Outfall 001
NC0020834 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 2 MGD
Acute: 550.814
Lead NC 16.3225 FW(7Q10s) 433.3813 ug/L 4 0 12.950 ___ _ ____ _ _ __ _ _ _ _ _ _ _ ___ _ _ ____
Note: n< 9 C.V. (default) Chronic: 21.588 All values reported non-detect < 10 ug/L- No
Limited data set NO DETECTS Max MDL= 10 monitoring required.
Acute (FW): 1,621.8
Nickel NC 138.0017 FW(7Q10s) 1276.0166 µg/L _ _ _ _____ ____ ___________________________
4 0 13.0 Chronic (FW) 182.5
Note: n< 9 C.V. (default) Max MDL= 10 ____ ____ _ _ _ _ _ _ _ _ _ _ _ _ _
Nickel NC 25.0000 WS(7Q10s) µg/L Limited data set NO DETECTS Chronic (WS) 33.1 No RP, Predicted Max< 50% of Allowable Cw- No
Max MDL= 10 Monitoring required
Acute: 71.2
Selenium NC 5 FW(7Q10s) 56 ug/L 4 0 13.0 ___ _ ___________ ___________________________
Note: n< 9 C.V. (default) Chronic: 6.6
All values reported non-detect < 10 ug/L- No
Limited data set NO DETECTS Max MDL= 10 monitoring required.
Acute: 5.706
Silver NC 0.06 FW(7Q10s) 4.4892 ug/L 4 0 6.475
Note: n< 9 C.V. (default) Chronic: 0.079 All values reported non-detect < 5 ug/L- No
monitoring required. Permittee shall report to PQL of
Limited data set NO DETECTS Max MDL= 5 1 ug/L.
Acute: 609.4
Zinc NC 470.6972 FW(7Q10s) 479.4976 ug/L 17 17 492.9 ___ _ ______ ____ _ _ _ _ _ _ _ _ _ _ _ _ __
Chronic: 622.5 No RP , Predicted Max >_ 50% of Allowable Cw
No value>Allowable Cw apply Quarterly Monitoring
Acute: NO WQS
Thallium NC 2 HH(7Q10s) µg/L 14 1 24.20000 — _ _ ---- _ _
-2.645--- ---------------------------
Chronic:- RP shown - apply Monthly Monitoring with Limit
14 values >Allowable Cw
20834 RPA, rpa
Page 2 of 2 12/7/2020

Thallium (CAS#7440-28-0)
Health Effects Summary
Human health effects associated with low environmental exposures to thallium are unknown. Severe
neurological, gastrointestinal, cardiovascular, and respiratory effects leading to death as well as alopecia
(hair loss) have been reported in humans and animals following large, acute doses. Changes in blood
chemistry, kidney and adrenal weights, and sperm quality in addition to alopecia, developmental delays
and increased mortality have been reported in animal studies following oral administration of thallium
compounds.
Necessity for Assessment of Thallium Criteria
The Division of Water Resources (DWR) relies upon the US Environmental Protection Agency(US EPA)
Section 304(a) publications, when they are available, to assess and control the releases of toxics to the
environment.These publications, collectively known as the National Recommended Water Quality
Criteria (NRWQC), are published, peer-reviewed recommendations for states and tribes. DWR staff
routinely review the NRWQC for possible development of state standards. For thallium, we noted that
the thallium criterion has not been updated since approximately 2003.The current thallium values for
Water Supply(0.24 µg/L) and Fish Consumption (0.47 µg/L) 1 do not reflect recent published literature
and science. In 2015, the US EPA updated 94 chemical pollutants'to reflect the latest scientific
information and federal policies.They did not update the human health criterion for thallium citing
"outstanding technical issues". DWR reviewed recent publications for evaluation and consideration of a
more appropriate criterion.
Examination of Literature
US EPA's Integrated Risk Information System (IRIS, 1988)3 established oral reference doses (RfDs)for
soluble thallium (I) compounds ranging from 0.000068 to 0.00009 mg/kg-day. An oral RfD assesses the
risk for health effects other than cancer and gene mutations.These RfDs were withdrawn and replaced
with a "qualitative discussion" in 2009 due to the limitations in the toxicology database and poor quality
of the toxicology studies available for thallium4.These RfDs form the basis of the NRWQC and are,
therefore, questioned for use in a state criterion.
IRIS determined there are inadequate data to assess the carcinogenic potential of thallium. A cancer
potency factor is not available.Therefore, a human exposure concentration associated with an
incremental lifetime cancer risk estimate cannot be calculated.
1 https://www.epa.gov/wqc/national-recommended-water-quality-criteria-human-health-criteria-table
2 https://www.epa.gov/wqc/human-health-water-quality-criteria-and-methods-toxics
3 https://cfpub.epa.gov/ncea/iris/iris documents/documents/subst/1012 summary.pdf
4 https://cfpub.epa.gov/ncea/iris/iris documents/documents/toxreviews/1012tr.pdf
Wage

US EPA's National Center for Environmental Assessment(NCEA, 2012)5 declined calculating a chronic,
oral provisional peer-reviewed toxicity value (PPRTV) due to the lack of good quality toxicology studies
available for thallium. They chose instead to derive the following screening provisional RfD's (p-RfD's),
provided in an Appendix to the document:
Screening Chronic p-RfD for thallium (I) sulfate 0.00002 mg/kg-day
Screening Chronic p-RfD for soluble thallium 0.00001 mg/kg-day
These values have a caveat that reads: "Users of screening toxicity values in an appendix to a PPRTV
assessment should understand that there is considerably more uncertainty associated with the
derivation of a supplemental screening toxicity value than for a value presented in the body of the
assessment." (USEPA, 2012)The screening levels for thallium sulfate and soluble thallium are not
appropriate for developing standards due to the high level of uncertainty associated with such values.
The Agency for Toxic Substances and Disease Registry, US Public Health Service (ATSDR, 1992) declined
to establish a chronic Minimum Risk Level (MRL) for thallium due to a lack of adequate data.6
A federal Maximum Contaminant Level (MCL) of 2 µg/L has been established for thallium under the Safe
Drinking Water Act'along with a Maximum Contaminant Level Goal (MCLG) of 0.5 µg/L.The MCL and
MCLG are based on a 90-day gavage study in rats (Stoltz et al., 1986). In this study, the only grossly
observed finding at necropsy thought to be treatment-related was alopecia; however, based on the
absence of microscopic histopathologic changes, US EPA identified a no observed adverse effect level
(NOAEL) of 0.2 mg/kg-day. Due to uncertainties in the NOAEL, US EPA incorporated a 3000-fold
uncertainty factor (10 for use of a subchronic study, 10 for intra-species variability, 10 for interspecies
variability, and 3 to account for inadequate testing of other endpoints of toxicity.) Based on this NOAEL,
a Drinking Water Equivalent Level (DWEL) of 2.45 µg Thallium/L was calculated and rounded to 2 µg TI/L.
The federal MCL is the same as the DWEL, and is expressed as 0.002 mg/L (2 µg/L).The MCLG
incorporates a Relative Source Contribution (RSC) of 20%to account for exposure routes other than
drinking water.
The US Department of Health and Human Services, National Toxicology Program (NTP) nominated
Thallium and Thallium salts (N21607-6/2016)for toxicological review8. (Note: We were not able to
determine the status of the progress.)
The US EPA NRWQC Human Health Calculation Matrix9 lists a Bioconcentration Factor (BCF) of 116; It
appears that the BCF factor used in the NRWQC is from US EPA's 1980 Ambient Water Quality Criteria
for Thallium (440/5-80-074) and is based upon three studies from 197510. (Zitko, et al). Current
accumulation studies are performed differently than those in 1975, however, we have no additional
information to base a modification to this value.
5 https://hhpprtv.ornl.gov/ and https://hhpprtv.ornl.gov/issue papers/ThalliumSolubleSalts.pdf
6 https://www.atsdr.cdc.gov/toxprofiles/TP.asp?id=309&tid=49
'https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations
8 https://ntp.niehs.nih.gov/ntp/about ntp/bsc/2016/june/meetingmaterials/thalliumcompounds 508.pdf
9 https://nepis.epa.gov/Exe/ZyPDF.cgi/200031EI.PDF?Docket'=20003IEl.PDF
1°https://nepis.epa.gov/Exe/ZyPDF.cgi/2000LNGQ.PDF?Docket'=2000LNGQ.PDF
2IPage

Recommended Surface Water Criteria for Thallium
The US EPA National Recommended Water Quality Criteria for thallium does not appear to be
supportable, as the values were based on a EPA IRIS RfD (Reference Cite: IRIS 09/01/90) and the
reference has been withdrawn and replaced with a "qualitative discussion". No new toxicological
information relevant to the derivation of a North Carolina specific criterion is available.
Staff of the Classifications and Standards/Rules Review Branch recommend the use of the federal MCL of
2 µg/L for thallium in all surface waters of the state, as allowed in 15A NCAC 02B, until such time that
more substantive information becomes available.
References:
Agency for Toxic Substances and Disease Registry.Toxicological Profile for Thallium. 1992.
http://www.atsdr.cdc.gov/
MRI (Midwest Research Institute). 1988.Toxicity of thallium (I) sulfate (CAS NO. 7446-18-6) in Sprague-
Dawley rats. Volume 2: Subchronic (90-day) study [revised final report]. Docket ID: EPA-HQ-ORD-2008-
0057-0002 and EPA-HQ-ORD-2008-0057-0003.
US Department of Health and Human Services:
https://ntp.niehs.nih.gov/testing/noms/search/summary/nm-n21607.html#top
U.S. EPA Drinking Water Standards and Health Advisories. 2018. Office of Water(EPA 822-F-18-001)
https://www.epa.gov/sites/production/files/2018-03/documents/dwtable2018.pdf
US EPA National Recommended Water Quality Criteria: 2002 Human Health Calculation Matrix(EPA-
822-R-02-012) https://nepis.epa.gov/Exe/ZvPDF.cgi/200031EI.PDF?Docker=200031EI.PDF
U.S. EPA. Provisional Peer Reviewed Toxicity Values for Thallium and Compounds. 2012. Office of
Research and Development, National Center for Environmental Assessment
https://hhpprtv.ornl.gov/quickview/pprtv papers.php
U.S. EPA Integrated Risk Information System. Chemical Assessment Summary for Thallium (I), soluble
salts. 2009. http://www.epa.gov/iris (accessed March 06, 2018).
Zitko V, Carson WV.1975 Accumulation of thallium in clams and mussels. Bull Environ Contam Toxicol
14:530-533
April 17, 2018
3IPage

NH3/TRC WLA Calculations
Facility: Warren County WWTP
PermitNo. NC0020834
Prepared By: Nick Coco
Enter Design Flow(MGD): 2
Enter s7Q10 (cfs): 1
Enter w7Q10 (cfs): 1
Total Residual Chlorine (TRC) Ammonia (Summer)
Daily Maximum Limit (ug/I) Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS) 1 s7Q10 (CFS) 1
DESIGN FLOW (MGD) 2 DESIGN FLOW (MGD) 2
DESIGN FLOW (CFS) 3.1 DESIGN FLOW (CFS) 3.1
STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0
Upstream Bkgd (ug/I) 0 Upstream Bkgd (mg/I) 0.22
IWC (%) 75.61 IWC (%) 75.61
Allowable Conc. (ug/I) 22 Allowable Conc. (mg/I) 1.3
Same as current permit limit.Maintain limit. More stringent than current permit limit.Apply limit.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/I)
Fecal Coliform w7Q10 (CFS) 1
Monthly Average Limit: 200/100m I DESIGN FLOW (MGD) 2
(If DF >331; Monitor) DESIGN FLOW (CFS) 3.1
(If DF<331; Limit) STREAM STD (MG/L) 1.8
Dilution Factor(DF) 1.32 Upstream Bkgd (mg/I) 0.22
IWC (%) 75.61
Allowable Conc. (mg/I) 2.3
More stringent than current permit limit.Apply limit.
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit(Municipals)
3. Monthly Avg limit x 5 = Daily Max limit(Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit(Municipals) = Daily Max limit(Non-Muni)

NC0020834 Warren County WWTP 10/6/2020
BOD monthly removal rate TSS monthly removal rate
Month RR(%) Month RR(%) Month RR(%) Month RR(%)
September-16 98.82 March-19 94.78 September-16 98.51 March-19 92.46
October-16 98.87 April-19 95.06 October-16 98.70 April-19 93.01
November-16 99.05 May-19 98.01 November-16 99.33 May-19 97.91
December-16 98.46 June-19 97.61 December-16 95.13 June-19 97.55
January-17 98.49 July-19 98.16 January-17 98.86 July-19 98.49
February-17 98.70 August-19 98.54 February-17 98.54 August-19 98.55
March-17 99.07 September-19 98.68 March-17 98.10 September-19 98.92
April-17 98.80 October-19 98.31 April-17 97.83 October-19 98.07
May-17 98.70 November-19 98.44 May-17 98.40 November-19 98.76
June-17 98.61 December-19 98.28 June-17 98.34 December-19 98.15
July-17 99.43 January-20 98.35 July-17 99.02 January-20 98.10
August-17 95.79 February-20 98.13 August-17 98.05 February-20 98.25
September-17 98.57 March-20 98.82 September-17 98.38 March-20 99.24
October-17 98.73 April-20 98.00 October-17 98.20 April-20 97.89
November-17 98.44 May-20 97.72 November-17 97.74 May-20 97.56
December-17 97.84 June-20 98.36 December-17 96.84 June-20 98.27
January-18 96.71 July-20 98.66 January-18 95.27 July-20 98.91
February-18 98.05 August-20 98.59 February-18 98.07 August-20 98.34
March-18 97.22 September-20 March-18 95.89 September-20
April-18 97.98 October-20 April-18 97.96 October-20
May-18 98.02 November-20 May-18 98.71 November-20
June-18 98.14 December-20 June-18 98.66 December-20
July-18 97.56 January-21 July-18 98.21 January-21
August-18 97.44 February-21 August-18 97.74 February-21
September-18 98.01 March-21 September-18 97.91 March-21
October-18 97.20 April-21 October-18 98.45 April-21
November-18 97.68 May-21 November-18 97.73 May-21
December-18 97.05 June-21 December-18 96.73 June-21
January-19 96.47 July-21 January-19 95.73 July-21
February-19 95.82 August-21 February-19 92.63 August-21
Overall BOD removal rate 97.96 Overall TSS removal rate 97.67

Instream Dissolved Oxygen Summary NC0020834 Warren County WWTP
Upstream Downstream Upstream Downstream
Date [mg/L] [mg/L] Date [mg/L] [mg/L]
9/1/2016 8 6.8 12/27/2018 12.3 12.7
9/26/2016 6.3 7.4 1/23/2019 12.8 13.3
10/6/2016 6.8 8.1 2/11/2019 10.7 12.5
7/13/2017 5.2 6.1 3/7/2019 12 12.5
7/31/2017 5.9 5.9 4/1/2019 9.9 10.7
8/11/2017 6 6.3 5/8/2019 7.3 7.9
8/23/2017 5.2 6.4 5/28/2019 6.3 8.6
9/6/2017 6.6 7.2 6/17/2019 6.7 7.9
9/28/2017 5.4 6 6/27/2019 6.6 7.3
10/26/2017 5.5 9.2 7/12/2019 6 6.5
11/29/2017 13.6 11 7/22/2019 5.7 6.7
12/28/2017 12.6 11.4 8/1/2019 6 7.1
1/31/2018 10.6 11.2 8/23/2019 5.4 7
2/22/2018 6.8 7.4 9/13/2019 4.9 6.4
3/5/2018 9.1 10.3 9/23/2019 5.5 7.4
4/9/2018 9.6 10.5 10/16/2019 7.9 8.8
5/10/2018 7.5 7.2 11/25/2019 11.4 11.8
5/29/2018 6 6.9 12/19/2019 10.1 11
6/18/2018 5.7 6.4 1/29/2020 11.8 12.5
6/28/2018 6.3 6.5 2/25/2020 10.7 11.9
7/16/2018 6.1 5.1 3/16/2020 9.2 10.6
7/26/2018 6.2 5.7 4/13/2020 8.2 8.9
8/9/2018 5.5 6.3 5/13/2020 9.9 10.3
8/22/2018 7 6.5 5/26/2020 7.7 8.5
9/10/2018 5.9 5.9 6/11/2020 6.2 7
9/21/2018 5.3 8.6 6/23/2020 6.1 8.9
10/2/2018 6.8 7.5 Average 7.7 8.5
11/15/2018 9.2 10.9 Max 13.6 13.3
Min 4.9 5.1
p-value > .05

Instream Fecal Coliform Summary NC0020834 Warren County WWTP
Upstream Downstream
Date [#/100mL] [#/100mL]
9/1/2016 78 98
10/6/2016 88 126
7/13/2017 23 30
8/23/2017 20 126
9/6/2017 20 54
10/26/2017 42 175
11/29/2017 54 220
12/28/2017 42 240
1/31/2018 60 74
2/22/2018 104 210
3/5/2018 58 78
4/9/2018 108 86
5/10/2018 39 33
6/28/2018 72 88
7/16/2018 78 48
8/9/2018 46 130
9/21/2018 98 60
10/2/2018 84 58
11/15/2018 510 450
12/27/2018 66 112
1/23/2019 50 70
2/11/2019 102 280
3/7/2019 20 33
4/1/2019 25 25
5/8/2019 31 26
6/17/2019 34 48
7/22/2019 30 48
8/23/2019 78 58
9/23/2019 84 58
10/16/2019 82 86
11/25/2019 70 84
12/19/2019 44 74
1/29/2020 92 50
2/25/2020 21 38
3/16/2020 42 46
4/13/2020 310 146
5/13/2020 40 44
6/11/2020 34 15
Geomean 56.2 74.1
Max 510 450
Min 20 15
p-value > .05

Instream Temperature Summary NC0020834 Warren County WWTP
Upstream Downstream Upstream Downstream
Date [degC] [degC] Date [degC] [degC]
9/1/2016 23.4 24.2 1/23/2019 2.1 2.4
9/26/2016 21.3 21.5 2/11/2019 6.5 6.7
10/6/2016 18.6 18.5 3/7/2019 4.3 4.8
7/13/2017 25.9 25.8 4/1/2019 10.7 11.8
7/31/2017 20.8 21.9 5/8/2019 19.3 19.2
8/11/2017 24 24.1 5/28/2019 23 23
8/23/2017 24.6 24.6 6/17/2019 21.3 21
9/6/2017 21.5 21.4 6/27/2019 23.1 23.3
9/28/2017 21.8 23.3 7/12/2019 25.1 25.4
10/26/2017 13.5 14.2 7/22/2019 25.7 26.6
11/29/2017 5.7 5.5 8/1/2019 22.9 23.3
12/28/2017 2 2.9 8/23/2019 24.3 24.8
1/31/2018 3.1 4 9/13/2019 23.8 24.5
2/22/2018 15.6 14.7 9/23/2019 19.4 20.4
3/5/2018 7.9 8.1 10/16/2019 15.5 16
4/9/2018 10.5 10.6 11/25/2019 7.5 8
5/10/2018 18.5 18.1 12/19/2019 5.2 6.2
5/29/2018 21.4 20.6 1/29/2020 5.4 5.7
6/18/2018 24.3 24 2/25/2020 8.9 8.6
6/28/2018 23.4 23.2 3/16/2020 11.7 12.2
7/16/2018 22.9 24.5 4/13/2020 17 16.4
7/26/2018 23.1 23.2 5/13/2020 12.4 12.9
8/9/2018 24.9 24.9 5/26/2020 19 19.3
8/22/2018 24.5 24.2 6/11/2020 24.1 24.5
9/10/2018 22.1 22.7 6/23/2020 22.6 22.4
9/21/2018 23 23 Average 17.1 17.3
10/2/2018 20.1 20 Max 25.9 26.6
11/15/2018 8.4 8.9 Min 2 2.4
12/27/2018 3.6 4 p-value > .05

12/3/20 WQS= 12 ng/L MERCURY WQBEL/TBEL EVALUATION V:2013-6
Facility Name
Warren County WWTP/NC0020834 No Limit Required
/Permit No. :
MMP Required
Total Mercury 1631E PQL= 0.5 ng/L 7Q10s = 1.000 cfs WQBEL= 15.87 ng/L
Date Modifier Data Entry Value Permitted Flow= 2.000 47 ng/L
9/17/15 2.32 2.32 2.3 ng/L-Annual Average for 2015
3/9/17 1.35 1.35 1.4 ng/L-Annual Average for 2017
6/22/18 3.54 3.54 3.5 ng/L-Annual Average for 2018
12/12/19 4.36 4.36 4.4 ng/L-Annual Average for 2019

Warren County WWTP/NC0020834
Mercury Data Statistics (Method 1631E)
2015 2017 2018 2019
#of Samples 1 1 1 1
Annual Average, ng/L 2.3 1.4 3.5 4.36
Maximum Value, ng/L 2.32 1.35 3.54 4.36
TBEL, ng/L 47
WQBEL, ng/L 15.9

Reduction in Frequency Evalaution
Facility: Warren County WWTP
Permit No. NC0020834
Review period (use 9/2017 9/2020
3 yrs)
Approval Criteria: Y/N?
1.Not currently under SOS Y
2.Not on EPA Quarterly noncompliance
report Y
3.Facility or employees convicted of CWA
N
violations
#of non-
Monthly 3-yr mean #daily #daily Reduce
Weekly average 50% 200% 200% monthly #civil penalty
Data Review Units average (geo mean <50%? samples <15? samples <20? >2? >1? Frequency?
limit MA MA WA limit asessment
limit for FC) >200% >200% (Yes/No)
violations
BOD(summer) mg/L 13.5 9 4.5 1.6497268 Y 18 0 Y 0 N 0 N Y
BOD(winter) mg/L 27 18 9 2.1629921 Y 36 0 Y 0 N 0 N Y
TSS mg/L 45 30 15 2.7827974 Y 60 0 Y 0 N 0 N Y
Ammonia (summer) mg/L 3.9 1.3 0.7 0.0766848 Y 2.6 0 Y 0 N 0 N Y
Ammonia(winter) mg/L 7.2 2.3 1.2 0.0666142 Y 4.6 0 Y 0 N 0 N Y
Fecal Coliform #/100 400 200 100 11.190396 Y 800 0 Y 0 N 0 N Y

MONITORING REPORT(MR)VIOLATIONS for: Report Date: 10/06/2C Page 1 of 1
Permit: NC0020834 MRs Betweet 9 - 2016 and 9 - 2020 Region: % Violation Category:Limit Violation Program Category:%
Facility Name:% Param Name% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NC0020834 FACILITY: Town of Warrenton-Warrenton WWTP COUNTY:Warren REGION: Raleigh
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
01-2018 001 Effluent Cyanide,Total(as Cn) 01/31/18 Monthly ug/I 6.6 7 6.1 Monthly Average No Action, BPJ
Exceeded
03-2018 001 Effluent Cyanide,Total(as Cn) 03/31/18 Monthly ug/I 6.6 7 6.1 Monthly Average No Action, BPJ
Exceeded
04-2018 001 Effluent Cyanide,Total(as Cn) 04/30/18 Monthly ug/I 6.6 8.67 31.3 Monthly Average No Action, BPJ
Exceeded
05-2018 001 Effluent Cyanide,Total(as Cn) 05/31/18 Monthly ug/I 6.6 13 97.0 Monthly Average Proceed to NOV
Exceeded
01-2019 001 Effluent Cyanide,Total(as Cn) 01/31/19 Monthly ug/I 6.6 7.62 15.5 Monthly Average No Action, BPJ
Exceeded
02-2019 001 Effluent Cyanide,Total(as Cn) 02/28/19 Monthly ug/I 6.6 8 21.2 Monthly Average No Action, BPJ
Exceeded
04-2019 001 Effluent Cyanide,Total(as Cn) 04/30/19 Monthly ug/I 6.6 8 21.2 Monthly Average No Action, BPJ
Exceeded
12-2017 001 Effluent Nitrogen,Total-Quantity 12/31/17 Annually lbs/yr 28,523 35,586.79 24.8 Annual Load Exceeded No Action, BPJ
(Yearly)
12-2018 001 Effluent Nitrogen,Total-Quantity 12/31/18 Annually lbs/yr 28,523 36,582.69 28.3 Annual Load Exceeded No Action, BPJ
(Yearly)
12-2019 001 Effluent Nitrogen,Total-Quantity 12/31/19 Annually lbs/yr 28,523 36,037.42 26.3 Annual Load Exceeded No Action, BPJ
(Yearly)

United States Environmental Protection Agency Form Approved.
EPA Washington,D C 20460 OMB No.2040-0057
Water Compliance Inspection Report Approval expires 8-31-98
Section A:National Data System Coding(i.e.,PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 I i l 2 U 3 1 NC0020834 111 121 20/07/22 117 18 ILI 19 I c 1 2011
211_1_1__1_1_1___1_1_1_LIJ_11_1_1_1_1 1 Ll_1_1_1_1_1_1_Ll_l_l_I_1_1_1_1_11 6
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 OA --------Reserved
67[ J 70I t- IL I 71u 72 [2W7`f 73 751
_1_1_1_1_1_1_180
Section B: Facility Data
Name and Location of Facility Inspected(For Industrial Users discharging to POTW, also include Entry Time/Date Permit Effective Date
POTYU name and NPDES permit Number)
10:30AM 20107122 16/06/01
Warrenton WWTP
615 US Hwy 401 S Exit Time/Date Permit Expiration Date
Warrenton NC 27589 12 45Ptvl 20/07/22 19/10/31
Name(s)of 0nsite Representative(s)Tttes(s)/Phone and Fax Number(s) Other Facility Data
1/!
Kenneth Wayne Champion11252-257-1776/
Kenneth Wayne Champion/ORC1252-257-17761
William R Perkinson//252-257-1776/
William Robert Perkinson/ORC/252-257-1776/
Name,Address of Responsible Official/Title/Phone and Fax Number
Contacted
C.Wayne Mitchetl,PO Box 281 Warrenton NC 2758902811/252.257-1776/
Yes
Section C;Areas Evaluated During Inspection (Check only those areas evaluated)
• Permit • Flow Measurement • Operations&Maintenar • Records/Reports
• Self-Monitoring Progran • Sludge Handling DispoE • Facility Site Review • Effluent/Receiving Wale
• Laboratory
Section D: Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s)and Signature(s)of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Mitchell S Hayes DWR/RRO WO/919-791-4200/
//i/001/tigil
Signature of Management OAReviewer Agency/Office/Phone and Fax Numbers Date
fr9- 79 11232— .Z.4 ZZ zin
EPA Form 3560-3 (Rev 9-94)Previous editions are obsolete.

NPDES yrlmolday Inspection Type (Cont.) 1
31 NC0020834 I11 121 20/07/22 117 18 u
Section D: Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
The current permit expired October 31, 2019 and is under review. Please continue to operate under the
last issued permit until the permit is renewed.
The 2.0 MGD plant consists of the following units: influent pump station with three pumps; manual and
mechanical bar screens; vortex grit removal chamber; two (2) 1,500,000 gallon dual oxidation ditches;
two (2) secondary clarifiers; four (4) tertiary sand filters; two (2) 135,000 gallon aerobic digesters; gas
chlorination and contact chambers; cascade aeration; and gas dechlorination (sulfur dioxide) and
contact chambers; two (2) on-site generators.
An A to C was issued February 15, 2019 for the following: one new multi-rake mechanical bar screen;
one new 100 GPM grit classifier and auger system; conversion of existing oxidation ditch number 1 to s
flow equalization basin; installation of 4 new 30 HP propeller mixers in oxidation ditch number 2;
replacement of existing lime system with a new liquid lime feed and storage system.
At the time of inspection: All three pumps were operational at the influent pump station. The mechanics
bar screen was in operation. The vortex grit chamber was out of service due to an impeller issue. One
oxidation was in use with all three rotors in operation. The second oxidation had excessive trees and
other vegetation growing in it preventing it from being used as designed. This vegetation must be
removed from the oxidation ditch and restore it to its designated use. Influent in the oxidation ditch
appeared black due to waste from International Paper. Sludge blankets in the 12-foot sidewall depth
secondary clarifiers were one foot. Effluent appeared clear flowing off the weirs. All four sand filters
were in use. One aerated digester was full and the other was being filled and was one-quarter full.
Effluent at the discharge point appeared clear with little foam and no solids.
Discharge Monitoring Reports for the review period October 2018 through May 2020 were checked for
compliance with permit limits and monitoring requirements. There were no violations.
Commercial lab results, chain of custody records, and bench sheets were compared with data
submitted on the Discharge Monitoring Report (DMR) for May 2020. No discrepancies were noted.
Laboratory number 349 is certified for the following parameters: DO, pH, temperature, and total
residual chlorine. Meritech Laboratory performs all other parameters.
The laboratory was checked in a cursory manner.All pH buffers were within expiration date. All
calibrations of instruments and temperatures of refrigerators and other equipment are recorded daily in
a log book.
The ORC logbook was available and being maintained. Other logbooks maintained include the
following: weekly, monthly, semi-annual, and annual equipment PM; and generator maintenance log.
The mercury minimization plan was last updated October 17, 2017.

Permit: NC0020834 Owner-Facility: Warrenton WWTP
Inspection Date: 07/22/2020 Inspection Type: Compliance Evaluation
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? 11111 ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable • 0 ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment:
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ 0 • 0
application?
Is the facility as described in the permit? • ❑ 0 ❑
#Are there any special conditions for the permit? 0 NI 0 ❑
Is access to the plant site restricted to the general public? U ❑ ❑ ❑
Is the inspector granted access to all areas for inspection? • 0 ❑ ❑
Comment: Permit expired October 31. 2019. Permit is under review.
Record Keeping Yes No NA NE
Are records kept and maintained as required by the permit? • 0 ❑ ❑
Is all required information readily available, complete and current? III ❑ 0 ❑
Are all records maintained for 3 years (lab. reg. required 5 years)? • ❑ ❑ ❑
Are analytical results consistent with data reported on DMRs? • ❑ ❑ ❑
Is the chain-of-custody complete? ❑ ❑ ❑
Dates, times and location of sampling •
Name of individual performing the sampling •
Results of analysis and calibration •
Dates of analysis
Name of person performing analyses •
Transported COCs •
Are DMRs complete: do they include all permit parameters? ■ ❑ ❑ ❑
Has the facility submitted its annual compliance report to users and DWQ? • 0 ❑ ❑
(If the facility is= or> 5 MGD permitted flow) Do they operate 24/7 with a certified operate 0 0 ■ ❑
on each shift?
Is the ORC visitation log available and current? 0 0 El
Is the ORC certified at grade equal to or higher than the facility classification? • 0 El 0
Is the backup operator certified at one gtade less or greater than the facility classification' 1111 ❑ ❑ ❑
Is a copy of the current NPDES permit available on site? • 0 ❑ 0

Permit: NC0020834 Owner-Facility: Warrenton WWTP
Inspection Date: 07/22/2020 Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Facility has copy of previous year's Annual Report on file for review? • 0 ❑ El
Comment: This is a 2.0 MGD plant
Effluent Pipe Yes No NA NE
Is right of way to the outfall properly maintained? II 0 0 0
Are the receiving water free of foam other than trace amounts and other debris? • ❑ ❑ ❑
If effluent (diffuser pipes are required) are they operating properly? ❑ ❑ • ❑
Comment: Effluent appeared clear.
Flow Measurement - Effluent Yes No NA NE
#Is flow meter used for reporting? 11 0 ❑ ❑
Is flow meter calibrated annually? • ❑ ❑ ❑
Is the flow meter operational? II ❑ 0 0
(If units are separated) Does the chart recorder match the flow meter? • ❑ 0 ❑
Comment: Meter calibrated 07.14.2020.
Aerobic Digester Yes No NA NE
Is the capacity adequate? MI ❑ 0 0
Is the mixing adequate? MI 0 0 0
Is the site free of excessive foaming in the tank? In ❑ ❑ ❑
#Is the odor acceptable? U 0 ❑ ❑
#Is tankage available for properly waste sludge? • ❑ ❑ ❑
Comment: Two aerobic digesters, one was one quarter full being filled and the other was full.
Drying Beds Yes No NA NE
Is there adequate drying bed space? S ❑ ❑ ❑
Is the sludge distribution on drying beds appropriate? ❑ ❑ r ❑
Are the drying beds free of vegetation? • 0 ❑ 0
#Is the site free of dry sludge remaining in beds? II ❑ ❑ 0
Is the site free of stockpiled sludge? MI ❑ 0 ❑
Is the filtrate from sludge drying beds returned to the front of the plant? • ❑ ❑ 0
# Is the sludge disposed of through county landfill? ❑ Cl 11 ❑
#Is the sludge land applied? ❑ 0 • 0

Permit: NC0020834 Owner-Facility: Warrenton WVVTP
Inspection Date: 07/22/2020 Inspection Type: Compliance Evaluation
Drying Beds Yes No NA NE
(Vacuum filters) Is polymer mixing adequate? El El MI ❑
Comment: Drying beds are not being used.
Chemical Feed Yes No NA NE
Is containment adequate? • El El ❑
Is storage adequate? • El El 0
Are backup pumps available? • ❑ ❑ El
Is the site free of excessive leaking? • ❑ ❑ El
Comment: Hydrated lime is feed into the oxidation ditch.
Pump Station - Influent Yes No NA NE
Is the pump wet well free of bypass lines or structures? • ❑ El ❑
Is the wet well free of excessive grease? ❑ ❑ ❑ •
Are all pumps present? I ❑ 0 El
Are all pumps operable? ■ ❑ ❑ ❑
Are float controls operable? DOD .
Is SCADA telemetry available and operational? • El ❑ 0
Is audible and visual alarm available and operational? ❑ ❑ El MI
Comment: Three pumps in the pump station. All are in use.
Bar Screens Yes No NA NE
Type of bar screen
a.Manual �
b.Mechanical •
Are the bars adequately screening debris? • ❑ ❑ ❑
Is the screen free of excessive debris? MI ❑ ❑ ❑
Is disposal of screening in compliance? • El ❑ ❑
Is the unit in good condition? 1111 0 ❑ ❑
Comment:
Grit Removal Yes No NA NE
Type of grit removal
a.Manual ❑

Permit: NC0020834 Owner-Facility: WarrentonWVVTP
Inspection Date: 07/22/2020 inspection Type: Compliance Evaluation
Grit Removal Yes No NA NE
b.Mechanical
1s the grit free of excessive organic matter? • ❑ ❑ 0
Is the grit free of excessive odor? • 0 0 0
#Is disposal of grit in compliance? I ❑ ❑ ❑
Comment: vortex grit chamber was not in service due to an impeller issue.
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater? • ❑ ❑ 0
Is the site free of excessive buildup of solids in center well of circular clarifier? E ❑ ❑ ❑
Are weirs level? ■ 0 0 0
Is the site free of weir blockage? • El ❑ ❑
Is the site free of evidence of short-circuiting? • 0 El
Is scum removal adequate? • 0 0 0
Is the site free of excessive floating sludge? II ❑ 0 ❑
Is the drive unit operational? • ❑ ❑
Is the return rate acceptable (low turbulence)? • ❑ ❑ 0
Is the overflow clear of excessive solids/pin floc? • 0 ❑ 0
Is the sludge blanket level acceptable? (Approximately 1/4 of the sidewall depth) • ❑ ❑ ❑
Comment: Sludge blankets were one foot in both clarifiers with a sidewall depth of 12 feet.
Oxidation Ditches Yes No NA NE
Are the aerators operational? • ❑ 0 0
Are the aerators free of excessive solids build up? • ❑ ❑ 0
#Is the foam the proper color for the treatment process? • ❑ 0 ❑
Does the foam cover less than 25% of the basin's surface? • ❑ 0 0
Is the DO level acceptable? • ❑ ❑ ❑
Are settleometer results acceptable (> 30 minutes)? ❑ ❑ 0 •
Is the DO level acceptable?(1.0 to 3.0 mg/I) MI ❑ 0 ❑
Are settelometer results acceptable?(400 to 800 mI/l in 30 minutes) ❑ ❑ ❑ IN
Comment: One oxidation was in use with all three rotors in operation. The second oxidation had
excessive trees and other vegetation growing in it preventing it from being used as designed
Nutrient Removal Yes No NA NE
# Is total nitrogen removal required? ® 0 El 0

Permit: NC0020834 Owner-Facility: Warrenton WWTP
Inspection Date: 07/22/2020 Inspection Type: Compliance Evaluation
Nutrient Removal Yes No NA NE
# Is total phosphorous removal required? • ❑ ❑ ❑
Type Biological
# Is chemical feed required to sustain process? ❑ • ❑ 0
Is nutrient removal process operating properly? • ❑ ❑ ❑
Comment: TP and TN are monitor and report.
Filtration (High Rate Tertiary) Yes No NA NE
Type of operation: Down flow
Is the filter media present? • 0 0 ❑
Is the filter surface free of clogging? • ❑ ❑ ❑
Is the filter free of growth? • 0 0 ❑
Is the air scour operational? ❑ ❑ • 0
Is the scouring acceptable? 0 0 ■ ❑
Is the clear well free of excessive solids and filter media? • 0 0 0
Comment:
Disinfection-Gas Yes No NA NE
Are cylinders secured adequately? • 0 0 0
Are cylinders protected from direct sunlight? • ❑ 0 0
Is there adequate reserve supply of disinfectant? III ❑ ❑ ❑
Is the level of chlorine residual acceptable? • 0 ❑ ❑
Is the contact chamber free of growth, or sludge buildup? II 0 0 ❑
Is there chlorine residual prior to de-chlorination? MI 0 ❑ ❑
Does the Stationary Source have more than 2500 lbs of Chlorine (CAS No. 7782-50-5)? ❑ • ❑ ❑
If yes, then is there a Risk Management Plan on site? 0 ❑ • ❑
If yes, then what is the EPA twelve digit ID Number? (1000- - )
If yes, then when was the RMP last updated?
Comment: Does not store more than 2500 lbs of chlorine.
De-chlorination Yes No NA NE
Type of system ? Gas
Is the feed ratio proportional to chlorine amount(1 to 1)? • 0 ❑ ❑
Is storage appropriate for cylinders? • 0 ❑ ❑

Permit: NC0020834 Owner-Facility: Warrenton WWTP
Inspection Date: 07/22/2020 Inspection Type: Compliance Evaluation
De-chlorination Yes No NA NE
#Is de-chlorination substance stored away from chlorine containers? El 0
Comment:
Are the tablets the proper size and type? 00110
Are tablet de-chlorinators operational? 0 ❑ • ❑
Number of tubes in use?
Comment:
Standby Power Yes No NA NE
Is automatically activated standby power available? • 0 0 ❑
Is the generator tested by interrupting primary power source? • 0 ❑ 0
Is the generator tested under load? • ❑ ❑ ❑
Was generator tested & operational during the inspection? ❑ • ❑ ❑
Do the generator(s) have adequate capacity to operate the entire wastewater site? IN ❑ ❑ ❑
Is there an emergency agreement with a fuel vendor for extended run on back-up power? • ❑ ❑ ❑
Is the generator fuel level monitored? • ❑ ❑ ❑
Comment: Both generators are load tested weekly.
Pumps-RAS-WAS Yes No NA NE
Are pumps in place? • 0 0 0
Are pumps operational? • El ❑ ❑
Are there adequate spare parts and supplies on site? ❑ El ❑ •
Comment:
Laboratory Yes No NA NE
Are field parameters performed by certified personnel or laboratory? U ❑ ❑ ❑
Are all other parameters(excluding field parameters) performed by a certified lab? • ❑ ❑ ❑
# Is the facility using a contract lab? • 0 ❑ 0
#Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees • 0 ❑ ❑
Celsius)?
Incubator(Fecal Coliform) set to 44.5 degrees Celsius+/-0.2 degrees? ❑ ❑ • ❑
Incubator(BOD) set to 20.0 degrees Celsius+1- 1.0 degrees? ❑ ❑ MI ❑
Comment: Laboratory number 349 is certified for the following parameters: DO, pH, temperature, and
total residual chlorine. Meritech Laboratory performs all other parameters.

Permit: NC0020834 Owner-Facility: Warrenton VWIP
Inspection Date: 07/22 2020 Inspection Type: :_ompliance Evaluation
Influent Sampling Yes No NA NE
# Is composite sampling flow proportional? • ❑ ❑ 0
Is sample collected above side streams? • ❑ 0 ❑
Is proper volume collected? ❑ 0 ❑ II
Is the tubing clean? • ❑ 0 0
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees E ❑ ❑ 0
Celsius)?
Is sampling performed according to the permit? • 0 0
Comment: Sampler temperature was 5 degrees C.
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional? • ❑ ❑ 0
Is sample collected below all treatment units? • ❑ ❑ 0
Is proper volume collected? ❑ 0 ❑ �
Is the tubing clean? • ❑ ❑ ❑
# Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees MI 0 ❑ ❑
Celsius)?
Is the facility sampling performed as required by the permit(frequency, sampling type • ❑ ❑ ❑
representative)?
Comment: Sampler temperature was 5 degrees C.

Whole Effluent Toxicity Testing and Self Monitoring Summary
Wade Hampton Club NC0062553/001 County: Jackson Region: ARO Basin: SAVO2 Mar Jun Sep Dec SOC JOC:
Ceri7dPF Begin: 10/1/2017 chr lim:34% NonComp: Single 7Q10: 0.37 PF: 0.125 IWC: 34 Freq: Q
J F M A M J J A S 0 N D
2016 - - Pass - - Pass - - Pass - - Pass
2017 - - Pass - - Pass - - Fail >100 >100 Pass
2018 - - Pass - - Pass - - Pass - - Pass
2019 - - Pass - - Pass - - Pass - - Pass
2020 - - Pass - - Pass - - - - - -
Wallace-L.Rockfish WWTP NC0003450/001 County: Duplin Region: WIRO Basin: CPF22 Jan Apr Jul Oct SOC JOC:
Ceri7dPF Begin: 12/1/2018 chr lim:67% NonComp: Single 7Q10: 4.2 PF: 5.42 IWC: 67 Freq: Q
J F M A M J J A 5 0 N D
2016 Pass - - Pass - >100(P) Pass>100(P) >100(P) >100(P) Pass - -
2017 Pass - - Pass - - Pass - - Pass - -
2018 Fail >100 >100 Pass - - Pass - - H - -
2019 H - - H - - H - - H - -
2020 H - - H - - Pass - - - - -
Warren Co.WWTP NC0020834/001 County: Warren Region: RRO Basin: TAR04 Mar Jun Sep Dec SOC JOC:
Ceri7dPF Begin: 6/1/2010 chr lim:76% NonComp: Single 7Q10: 1.0 PF: 2.0 IWC: 76.0 Freq: Q
J F M A M J J A 5 0 N D
2016 - - Pass - - Pass - - Pass - - Pass
2017 - - Pass - - Pass - - Pass - - Pass
2018 - - Pass - - Pass>100(P) - - >100(P) - - Pass>100(P)
2019 - - Pass>100(P) - - Pass - - Pass - - Pass
2020 - - Pass - - Pass - - - - - -
Washington County WTP NC0087009/001 County: Washington Region: WARO Basin: PAS53 Mar Jun Sep Dec SOC JOC:
Mysd7dPF Begin: 2/1/2018 Chr P/F Monit:0.83% NonComp: 7Q10: PF: 0.015 IWC: Freq: Q
J F M A M I J A 5 0 N D
2016 - - H - - H - - H - - H
2017 - - H - - H - - H - - H
2018 - - H - - H - - H - - H
2019 - - H - - H - - H - - H
2020 - - H - - - - - - - - -
Washington Regional WTP NC0081191/001 County: Beaufort Region: WARO Basin: TAR07 Jan Apr Jul Oct SOC JOC:
Mysd24PF Begin: 12/1/2014 Ac Monit:90% NonComp: 7Q10: Tidal PF: 0.42 IWC: NA Freq: Q
J F M A M I J A 5 0 N D
2016 Pass - - Fail - - Fail - - Fail - -
2017 Pass - - Pass - - Fail - - Fail - -
2018 Pass - - Pass - - Pass - - Pass - -
2019 Pass - - Pass - - Pass - - Pass - -
2020 Pass - - Pass - - Pass - - - - -
Legend: P=Fathead minnow(Pimphales promelas),H=No Flow(facility is active),s=Split test between Certified Labs Page 116 of 122

Attachment A-Request for Missing Information
Table 2. EPA Application Form 2A Missing Information
40 CFR 122.21(j)(1)
1.1 Email address of facility [e-mail]
1.2 Applicant email [e-mail]
1.3 Email address of the organization transporting the discharge for treatment prior to discharge-N/A
1.4 Email address of the organization receiving the discharge for treatment prior to discharge-N/A
1.5 ` Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(n)?(Check all that apply. Consult
with your NPDES permitting authority to determine what information needs to be submitted and when.)
El Discharges into marine waters(CWA Section 1-1 Water quality related effluent limitation(CWA
301(h)) Section 302(b)(2))
X Not applicable
1.6 Email address of contractor responsible for operational or maintenance aspects of the treatment works-N/A
40 CFR 122.21(j)(6)
1.7 Indicate the number of Sills and NSCIUs that discharge to the POTW.
Number of SltJs Number of Ms
0 0
40 CFR 122.22(a)and(d)
1.8 Certification Statement
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 fine and imprisonment for knowing
violations.
Name-Robert Davie Official title-Administrator-Town of Warrenton
Signature Date signed G
/l /1 S/010 620

Coco, Nick A
From: Bill <[e-mail]>
Sent: Tuesday, December 8, 2020 2:40 PM
To: Coco, Nick A
Cc: Montebello, Michael J
Subject: [External] RE: NC0020834 Warrenton County WWTP Permit Changes
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Mr. Coca,
All is well in Warrenton. I hope it is for you also. I appreciate the heads up for the changes in the upcoming permit and
the opportunity to comment.
On the matter of copper and thallium, we do not know the source of the outliers, so we are requesting a compliance
schedule.
We also would appreciate being able to continue on the reduced monitoring schedule for BOD,TSS, and Ammonia if
allowed.
Thanks...and have a good one!
Bill
Bill Perkinson,
Public Works Director
Town of Warrenton
PO Box 281
Warrenton, NC 27589
Phone [phone]
Fax [phone]
[e-mail]
From: Coco, Nick A<[e-mail]>
Sent: Monday, December 07, 2020 4:23 PM
To: Bill <[e-mail]>
Cc: Montebello, Michael J <[e-mail]>
Subject: NC0020834 Warrenton County WWTP Permit Changes
Hi Bill,
I hope all is well and you had a nice weekend.
I have just about finished drafting the renewal NPDES permit NC0020834 for the Warrenton County WWTP and wanted
to bring your attention to some of the changes to be made to the permit:
1

• Per 15A NCAC 08G .0302,the facility class has been changed to Grade IV due to the nutrient limits in the permit
and the rule conditions. A letter has already been sent to you by the Division's Operator Certification
Coordinator, Maureen Kinney, on November 4, 2020.
• As the facility class has been updated, monitoring frequencies for pH, total residual chlorine and dissolved
oxygen have been revised to reflect a Grade IV facility.
• Per the results of instream waste concentration (IWC)-based calculations for ammonia-nitrogen, ammonia
nitrogen limits have been revised.
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to violate state water quality
standards, the monitoring requirement for total phenolic compounds has been removed from the permit.
• Based on the reasonable potential analysis (RPA) showing reasonable potential to violate state water quality
standards, total copper and total thallium limits have been added to the permit and the quarterly monitoring
requirement has been changed to monthly monitoring.
• Based on mercury TMDL evaluation, monitoring for total mercury has been removed from the permit.
• The NC 2007-2014 Water Quality Standard (WQS)Triennial Review was approved by the NC Environmental
Management Committee (EMC) on November 13, 2014.The US EPA subsequently approved the WQS revisions
on April 6, 2016 with some exceptions.The NC Division of Water Resources NPDES Permitting Unit is required to
implement the new dissolved metal standards in all permits public noticed after April 6, 2016.The new
standards for most metals include acute standards. Further, the freshwater standards for several metals are
expressed as the dissolved form of the metals, and seven metals have hardness-dependent equations. As a
result, the NPDES Permitting Unit will need site-specific effluent hardness data and instream hardness data,
upstream of the discharge, for each facility monitoring these metals in order to calculate permit limitations.
Effluent hardness and instream hardness sampling, upstream of the discharge, have been added to the permit at
a monitoring frequency of quarterly.
These changes will also be noted on the cover letter to your draft permit, but I wanted to just make you aware of the
changes ahead of time, in case there were any arrangements you wanted to get ahead of.
Regarding the metals limits, upon request and justification, Permittees may be granted Schedules of Compliance for
newly added limits in their permits. I bring this up because the Warrenton County WWTP did report copper and thallium
samples detected at levels higher than the parameters' respective allowable discharge concentrations. If you wish to
have a compliance schedule, please let me know. If you believe you know from where your facility is receiving these
parameters and that you will be able to achieve compliance with your permit limits upon the effective date of the
permit, we can skip the compliance schedule.
Summary of data
Parameter Maximum Reported Maximum Predicted Allowable RPA Analysis Decision
Concentration Concentration Discharge
Concentration
Total Thallium 20.0 ug/L 24.2 ug/L MA 2.6 ug/L RP shown -apply Monthly
Monitoring with Limit
Total Copper 67.0 ug/L 89.78 ug/L MA 39.1 ug/L RP shown -apply Monthly
DM 58.9 ug/L Monitoring with Limit
The changes in ammonia limits are based on instream-waste concentration-based calculations which resulted in the
following limits:
Season Monthly Average Weekly Average
Ammonia Limit Ammonia Limit
Summer 1.3 mg/L 3.9 mg/L
Winter 2.3 mg/L 6.9 mg/L
2

The Town has demonstrated that compliance with this limit is already being achieved, so this change would not warrant
a compliance schedule.
Let me know what you think, whenever you get the chance.
Nicholas A. Coco, El
Engineer
NPDES Municipal Permitting Unit
NC DEQ/Division of Water Resources/Water Quality Permitting
919 707-3609 office
919 707 9000 main office
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC,27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC,27699-1617
I'm working at home due to the State of Emergency and DWR policy for Covid-19. Thanks for being patient as we
try to stay safe.
**Email is preferred but I am available to talk by via Microsoft Teams**
NIC ""NotNnQ Cotlliplarea
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.
3

MAILED
s •_` ,,SSAtEr �
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ROY COOPER 14.
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MICHAEL S. REGAN ;f � .n=
50,rctary
S. DANIEL SMITH NORTH CA?OLI�i�
iY rector Environmental Quality
July 29, 2020
Bill Perkinson, Public Works Director
Town of Warrenton
P.O. Box 281
Warrenton, NC 27589-281
Subject: Compliance Evaluation Inspection
Warren County Wastewater Treatment Plant
NPDES Permit No. NC0020834
Warren County
Dear Mr. Perkinson:
Mitch Hayes of the Division of Water Resources conducted the subject inspection on July 22,
2020. Your assistance and the assistance of Kenny Champion, back-up Operator in Responsible
Charge, and Teresa Harris, Laboratory Supervisor, were greatly appreciated. Below is a list of
findings developed from the inspection and review of the permit:
1. The current permit expired October 31, 2019 and is under review. Please continue to
operate under the last issued permit until the permit is renewed.
2. The 2.0 MGD plant consists of the following units: influent pump station with three pumps;
manual and mechanical bar screens; vortex grit removal chamber; two (2) 1,500,000
gallon dual oxidation ditches; two (2) secondary clarifiers; four (4) tertiary sand filters;
two (2) 135,000 gallon aerobic digesters; gas chlorination and contact chambers; cascade
aeration; and gas dechlorination (sulfur dioxide) and contact chambers; two (2) on-site
generators.
3. An A to C was issued February 15, 2019 for the following: one new multi-rake mechanical
bar screen; one new 100 GPM grit classifier and auger system; conversion of existing
oxidation ditch number 1 to a flow equalization basin; installation of 4 new 30 HP propeller
mixers in oxidation ditch number 2; replacement of existing lime system with a new liquid
lime feed and storage system.
4. At the time of inspection: All three pumps were operational at the influent pump station.
The mechanical bar screen was in operation. The vortex grit chamber was out of service
due to an impeller issue. One oxidation was in use with all three rotors in operation. The
second oxidation had excessive trees and other vegetation growing in it preventing it from
being used as designed. This vegetation must be removed from the oxidation ditch and
restore it to its designated use. Influent in the oxidation ditch appeared black due to waste
from International Paper. Sludge blankets in the 12-foot sidewall depth secondary

clarifiers were one foot. Effluent appeared clear flowing off the weirs. All four sand filters
were in use. One aerated digester was full and the other was being filled and was one-
quarter full. Effluent at the discharge point appeared clear with little foam and no solids.
5. Discharge Monitoring Reports for the review period October 2018 through May 2020 were
checked for compliance with permit limits and monitoring requirements. There were no
violations.
6. Commercial lab results, chain of custody records, and bench sheets were compared with
data submitted on the Discharge Monitoring Report (DMR) for May 2020. No
discrepancies were noted.
7. Laboratory number 349 is certified for the following parameters: DO, pH, temperature,
and total residual chlorine. Meritech Laboratory performs all other parameters.
8. The laboratory was checked in a cursory manner. All pH buffers were within expiration
date. All calibrations of instruments and temperatures of refrigerators and other
equipment are recorded daily in a log book.
9. The ORC logbook was available and being maintained. Other logbooks maintained include
the following: weekly, monthly, semi-annual, and annual equipment PM; and generator
maintenance log. The mercury minimization plan was last updated October 17, 2017.
Please respond to item number 4 about the excess vegetation in the oxidation ditch within 30
days receipt of this letter. I would like to thank you, and everyone involved with this inspection
for their time and assistance. If you have any questions concerning this letter or the inspection,
please contact Mitch Hayes at 919.791.4261 or at mitch.hayes(ancdenr.gov
Sincerely,
"e. Scott Vinson, Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NC DEQ
cc: permit file
Laserfiche

Warren County WWTP
Treatment Plant Narrative
NPDES #NC0020834
The Warren County WWTP is an advanced wastewater treatment plant utilizing the activated
sludge process. The facility is permitted for 2.0 MGD with an average daily flow of 0.44 MGD.
The facility receives wastewater flow from: Town of Warrenton, Town of Norlina and Soul City.
The Warren County WWTP consists of the following major units:
• Mechanical barscreen
• Grit Removal
• Influent Lift Station
• Two Oxidation Ditches
• Two secondary clarifiers
• RAS/WAS Pump Station
• Filters
• Chlorination Contact Chamber
• Dechlorination
• Cascade Aeration
• Aerobic sludge digesters
Preliminary Treatment
As the flow enters the facility it is screened. The physical process of wastewater treatment begins
with screening out large items that have found their way into the sewer system,and if not removed,
can damage pumps and impede water flow. The collected screenings are disposed of via
landfilling. The flow passes thru the screen to the grit removal system, where sand is removed.
Excessive sand entering the treatment process can cause excessive wear on pump parts, clog lines
and valves, and deposit on the bottom of the basins.
Secondary Treatment
From preliminary treatment the influent flow is pumped to the oxidation ditch(es). Due to the low
flows experienced at the facility, only one oxidation ditch is in-service at this time. The primary
function of the oxidation ditch(es)are to provide the necessary environment and time to encourage
the breakdown of any organic material (and the growth of the bacteria), as well as ensure there is
enough time for the organic material to be broken down. Aeration and mixing are accomplished
via surface mounted aerators. This process is managed to offer the best conditions for bacterial
growth.

The discharge from the aeration process flows into the secondary clarifiers where the biologically
flocculated solids settle to the bottom of the tanks. These solids or activated sludge consist mostly
of active bacteria. This settled activated sludge is returned to the aeration tank (Return Activated
Sludge or RAS) to increase the bacterial concentration, help in propagation, and accelerate the
breakdown of organic material. The RAS pump rate is maintained at approximately three times
the effluent flow rate. To maintain the proper amount of activated sludge in the oxidation ditch, a
portion of the settled sludge will be removed(Waste Activated Sludge or WAS)from the treatment
process by pumping a portion of the RAS to the sludge digester.
Tertiary Treatment
The clear effluent from each of the clarifiers flows to four tertiary sand filters for removal of any
solids that may not have settled in the clarifiers. The flow from the filters go the chlorine contact
basin. The chorine contact basins are dual train basins that be operated in parallel or individually.
A chlorine solution is added to the head of the basin(s) and the basin provides the needed contact
time for disinfection. A dechlorination solution is added at the effluent weir to reduce any residual
chlorine down to below permit limits.
Final Disposal
After Chlorination/Dechlorination, the effluent flow passes down a cascade to provide
supplemental dissolved oxygen to the water.
Solids Handling
The activated sludge that is removed from the treatment process is pumped to an aerobic sludge
digestor for further stabilization,thickening and solids reduction.

Warren County WWTP / NPDES #NC0020834
Disinfec
tion 0.22 MGD MLSS
o each Clarifier Oxidation Ditch 1.50 MG
0.44 MGD
0.22 MGD Clarifier
Tertiary
Filters - VG9
RAS RAS 3. �pf 1
1nf0.0MGI)
I /
I— Clarifier
0.22 GD _____2
Oxidation Ditch 1.50 MG
Reaeration
WAS
Jepto•Nix1. Digester
(0.135
MG)
250 KW
Influent Lift Station Digester Generator
(0.135
MG)
Effluent to Disposal 0.44 MGD Bar Screen and
Grit Removal
Influent Average 0.44 MGD

Annual Monitoring and Pollutant Scan
Permit No. NC0020834 Month DECEMBER
Outfall 1 Year 2019
Facility Name Town of Warrenton WWTP ORC William R. Perkinson
Date of sampling 12J12/19 Phone [phone]
Analytical Laboratory MERITECH, INC.
Sample Analytical Quantitation Sample Units of Number of
Parameter Type Method Level Result Measurement samples
Ammonia (as N) Composite EPA 350.1 0 0 mg, 1_
Dissolved oxygen Grab SM4500-0-G 1.0 10.19 mg/L 1
Nitrate/Nitrite Composite EPA 353.2 0.10 29.3 mg/L 1
Total Kjeldahl nitrogen Composite EPA 351.1 0.20 0 mg/L 1
Total Phosphorus Composite EPA 200.7 0.020 1.49 mg/L 1
Total dissolved solids Composite SM 2540 C 10.0 452 mg/L 1
Hardness Composite SM 2340 C 1 188 mg/L 1
Chlorine (total residual, TRC) Grab SM 4500 CIG 0.1 0.04 mg/L 1
Oil and grease Grab EPA 1664 B 5 0 mg/L 1
5.-'. ,x vm kxp ���`,�uH iE.'q5 �a;3 s: -.EwC E � _� �. 3.
Metals (total recoverable), cyanide and total phenols 1:4 le al e;€ � � i ;: ��a P�.3-.a. > i
Antimony Composite 'EPA 200.7 I 0.025 0 mg/L 1
Arsenic Composite EPA 200.7 0.010 0 mg/L 1
Beryllium Composite EPA 200.7 0.005 0 mg/L 1
Cadmium _ Composite EPA 200.7 0.002 0 mg/L 1
Chromium Composite EPA 200.7 0.005 0 mg/L r 1
Copper Composite EPA 200.7 0.002 0.0021 mg/L 1
Lead Composite EPA 200.7 0.010 0 mg/L 1
Mercury Composite EPA 1631 1 4.36 ng/L 1
Nickel Composite EPA 200.7 0.010 0 mg/L 1
Selenium Composite EPA 200.7 0.010 0 mg/L 1
Silver Composite EPA 200.7 0.005 0 mg/L 1
Thallium Composite EPA 200.7 0.020 0 mg/L 1
Zinc Composite EPA 200.7 0.010 0.046 mg/L 1
Cyanide Grab EPA 335.4 0.005 0 mg/L 1
Total phenolic compounds Grab ,EPA 420.1 0.010 0.019 mg/L 1
Volatile organic compounds
Acrolein Grab EPA 624.1 50 0 ug/L 1
Acrylonitrile Grab EPA 624.1 10 0 ug/L 1
Benzene Grab EPA 624.1 1.00 0 ug/L 1
Bromoform Grab EPA 624.1 1.00 0 ug/L 1
Carbon tetrachloride Grab EPA 624.1 1.00 0 ug/L 1
Chlorobenzene Grab EPA 624.1 1.00 0 ug/L 1
Chlorodibromomethane Grab EPA 624.1 1.00 0 ug/L 1
Chloroethane Grab EPA 624.1 5.00 0 ug/L 1
2-chloroethylvinyl ether Grab EPA 624.1 5.00 0 ug/L 1
Chloroform Grab EPA 624.1 1.00 7.85 ug/L 1
Dichlorobromomethane Grab EPA 624.1 1.00 2.38 ug/L I
1,1-dichloroethane Grab EPA 624.1 1.00 0 ug/L I
1,2-dichloroethane Grab EPA 624.1 1.00 0 ug/L 1
Trans-1,2-dichloroethylene Grab EPA 624.1 1.00 0 ug/L 1
Form - DMR- PPA-1 Page 1

Annual Monitoring and Pollutant Scan
Permit No. NC0020834 Month DECEMBER
Outfall 1 Year 2019
Sample Analytical Quantitation Sample Units of Number of
Parameter Type Method Level Result Measurement samples
Volatile organic compounds (Cont.)
1,1-dichloroethylcne Grab EPA 624.1 1.00 0 ug/L 1
1,2-dichloropropane Grab EPA 624.1 1.00 0 ug/L 1
1,3-dichloropropylene Grab EPA 624.1 1.00 0 ug/L 1
Ethylbenzene Grab EPA 624.1 1.00 0 ug/L 1
Methyl bromide Grab EPA 624.1 5.00 0 ug/L 1
Methyl chloride Grab EPA 624.1 5.00 0 ug/L 1
Methylene chloride Grab EPA 624.1 1.00 0 ug/L 1
1,1,2,2-tetrachloroethane Grab EPA 624.1 1.00 0 ug/L 1
,Tetrachloroethylene Grab EPA 624.1 1.00 0 ug/L 1
Toluene Grab EPA 624.1 1.00 0 ug/L 1
1,1,1-trichloroethane Grab EPA 624.1 1.00 0 ug/L 1
1,1,2-trichloroethane Grab EPA 624.1 1.00 0 ug/L 1
Trichloroethylene Grab EPA 624.1 1.00 0 ug/L 1
Vinyl chloride Grab EPA 624.1 5.00 0 ug/L 1
Acid-extractable compo l►ds
P-chloro-m-creso Grab 1EPA 625.1 10 0 ug/L 1
2-chlorophenol Grab EPA 625.1 10 0 ug/L 1
2,4-dichlorophenol Grab EPA 625.1 10 0 ug/L 1
2,4-dimethylphenol Grab EPA 625.1 10 0 ug/L 1
4,6-dinitro-o-cresol Grab EPA 625.1 50 0 ug/L 1
2,4-dinitrophenol Grab EPA 625.1 10 0 ug/L 1
2-nitrophenol Grab EPA 625.1 10 0 ug/L 1
4-nitrophenol Grab ,EPA 625.1 50 0 ug/L 1
Pentachlorophenol Grab _EPA 625.1 50 0 ug/L 1
Phenol Grab EPA 625.1 10 0 ug/L 1
2,4,6-trichlorophenol Grab EPA 625.1 1 i 0 ug/L - 1
Base-neutral compound s"'°7.. r `lc! ,.°4 dia
Acenaphthene Grab EPA 625.1 10 0 ug/L 1
y Acenaphthylene Grab EPA 625.1 10 0 ug/L 1
Anthracene Grab EPA 625.1 10 0 ug/L 1
Benzidine Grab EPA 625.1 50 0 ug/L 1
Benzo(a)anthracene Grab EPA 625.1 10 0 ug/L 1
Benzo(a)pyrene Grab EPA 625.1 10 0 ug/L 1
3,4 benzofluoranthene Grab EPA 625.1 10 0 ug/L 1
Benzo(ghi)perylene Grab EPA 625.1 10 0 ug/L 1
Benzo(k)fluoranthene Grab EPA 625.1 10 0 ug/L 1
Bis (2-chloroethoxy) methane Grab EPA 625.1 10 0 ug/L 1
Bis (2-chloroethyl) ether Grab EPA 625.1 10 0 ug/L 1
Bis (2-chloroisopropyl) ether Grab EPA 625.1 10 0 ug/L 1
Bis (2-ethylhexyl) phthalate Grab EPA 625.1 10 0 ug/L 1
4-bromophenyl phenyl ether Grab EPA 625.1 10 0 ug/L 1
Butyl benzyl phthalate Grab EPA 625.1 10 0 ug/L 1
2-chloronaphthalene Grab EPA 625.1 10 0 ug/L 1
Form - DMR- PPA-1 Page 2

Annual Monitoring and Pollutant Scan
Permit No. NC0020834 Month DECEMBER
Outfall 1 Year 2019
- -,hlorophenyl phenyl ether Grab EPA 625.1 10 T 0 ug/L .
Sample Analytical Quantitation Sample Units of Number of
Parameter Type Method Level Result Measurement samples
Base-neutral compounds (cont.)
Chrysene Grab EPA 625.1 10 0 ug/L I
Di-n-butyl phthalate Grab EPA 625.1 10 0 ug/L 1
Di-n-octyl phthalate Grab EPA 625.1 10 0 ug/L 1
Dibenzo(a,h)anthracene Grab EPA 625.1 10 0 ug/L 1
1,2-dichlorobenzene Grab EPA 625.1 10 0 ug/L 1
1,3-dichlorobenzene Grab EPA 625.1 10 0 ug/L 1
1,4-dichlorobenzene Grab EPA 625.1 10 0 ug/L 1
3,3-dichlorobenzidine Grab EPA 625.1 50 0 ug/L 1
Diethyl phthalate Grab EPA 625.1 10 _ 0 ug/L 1
Dimethyl phthalate Grab EPA 625.1 10 0 ug/L 1
2,4-dinitrotoluene Grab EPA 625.1 10 0 ug/L 1
2,6-dinitrotoluene Grab EPA 625.1 10 0 ug/L 1
1,2-diphenylhydrazine Grab EPA 625.1 10 0 ug/L 1
Fluoranthene Grab EPA 625.1 10 0 ug/L 1
Fluorene Grab EPA 625.1 10 0 ug/L 1
Hexachlorobenzene Grab EPA 625.1 10 0 ug/L 1
Hexachlorobutadiene Grab EPA 625.1 10 0 ug/L 1
^Hexachlorocyclo-pentadiene Grab EPA 625.1 50 0 ug/L 1
,Hexachloroethane Grab EPA 625.1 10 0 ug/L 1
Indeno(1,2,3-cd)pyrene Grab EPA 625.1 10 0 ug/L 1
Isophorone Grab EPA 625.1 10 0 ug/L 1
Naphthalene Grab EPA 625.1 - 10 0 ug/L 1
Nitrobenzene Grab EPA 625.1 10 0 ug/L 1
N-nitrosodi-n-propylamine Grab EPA 625.1 10 0 ug/L 1
N-nitrosodimethylamine Grab EPA 625.1 10 0 ug/L 1
N-nitrosodiphenylamine Grab EPA 625.1 10 0 ug/L 1
Phenanthrene Grab EPA 625.1 10 0 ug/L 1
Pyrene Grab EPA 625.1 10 0 ug/L 1
1,2,4,-trichlorobenzene Grab EPA 625.1 10 0 ug/L 1
"1 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 managed 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."
Authorizedut � Representative name
LI ;fiv 404-/ -
Signature
i - 27 - ®ZooZD
Date
Form - DMR- PPA-1 Page 3

Meritech, Inc.
Environmental Laboratory
Laboratory Certification No. 165
110
Contact: Linda Bobbitt Report Date: 12/27/2019
Client: Warrenton,Town of WWTP NPDES#: NC0020834
738 US Hwy 401 South Project: PPA
Warrenton, NC 27589 Date Sample Rcvd: 12/12/2019
Meritech Work Order# 12121992 Sample: Effluent Composite 12/11-12/19
Parameters Result Analysis Date Reporting Limit Method
Total Dissolved Solids 452 mg/L 12/13/19 10.0 mg/L SM 2540C
Ammonia, Nitrogen <0.1 mg/L 12/18/19 0.1 mg/L EPA 350.1
TKN <0.20 mg/L ,1 12/17/19 0.20 mg/L EPA 351.1
Nitrate/Nitrite, Nitrogen 29.3 mg/L V 12/13/19 0.10 mg/L EPA 353.2
Nitrogen,total 29.3 mg/L 12/18/19 0.20 mg/L EPA 353.2
Antimony,total <0.025 mg/I/ 12/23/19 0.025 mg/L EPA 200.7
Arsenic,total <0.010 mg/L'f 12/23/19 0.010 mg/L EPA 200.7
Beryllium,total <0.005 mg/L ,/ 12/23/19 0.005 mg/L EPA 200.7
Cadmium,total <0.002 mg/L„! 12/23/19 0.002 mg/L EPA 200.7
Chromium,total <0.005 mg/L✓ 12/23/19 0.005 mg/L EPA 200.7
Copper,total 0.021 mg/L V 12/23/19 0.002 mg/L EPA 200.7
Lead,total <0.010 mg/L ✓ 12/23/19 0.010 mg/L EPA 200.7
Nickel,total <0.010 mg/L ✓ 12/23/19 0.010 mg/L EPA 200.7
Phosphorus,total 1.49 mg/L✓ 12/23/19 0.020 mg/L EPA 200.7
Selenium,total <0.010 mg/L ✓ 12/23/19 0.010 mg/L EPA 200.7
Silver,total <0.005 mg/L✓ 12/23/19 0.005 mg/L EPA 200.7
Titanium,total <0.005 mg/L-- 12/23/19 0.005 mg/L EPA 200.7
Zinc,total 0.046 mg/L-' 12/23/19 0.010 mg/L EPA 200.7
Hardness (titration) 188 mg/LV" 12/19/19 1 mg/L SM 2340C
EPA 625.1 Attached -) 12/20/19 - - 625.1
Meritech Work Order# 12121993 Sample: Effluent PPA Grab 12/12/19
Parameters Result Analysis Date Reporting Limit Method
Cyanide,total <0.005 mg/L ✓ 12/17/19 0.005 mg/L EPA 335.4
Oil&Grease (HEM) <5 mg/L\/ 12/17/19 5 mg/L EPA 1664B
Phenols,total 0.019 mg/L✓ 12/13/19 0.010 mg/L EPA 420.1
EPA 624.1 Attached 12/17/19 - - 624.1
Total Residual Chlorine 0.14 mg/L O,D4 12/12/19 0.1 mg/L SM 4500 CIG
Dissolved Oxygen 10.19 mg/L ,/ 12/12/19 1.0 mg/L SM 4500-0-G
I hereby certify that I have reviewed and approve these data. 4, ai Mili- -
Laboratory Representative
642 Tamco Road, Reidsville, North Carolina 27320
tel.[phone] fax.[phone]

MERI TECH, INC.
...
11)11 .. ..
Environmental Laboratories
* Laboratory Certificate#165
VII
Client: Town of Warrenton Meritech ID#: 12121992
Project: 625.1 Analysis: 12/20/19
Client Sample ID: Effluent Extraction: 12/16/19
Sample Collection: 12/12/19 Analyst: PM
Report Date: 12/23/19 Dilution Factor: 1
EPA 625.1 SEMIVOLATILE ORGANICS
Parameter Result Parameter Result
Acenaphthene <10 ug/L Fluoranthene <10 ug/L
Acenaphthylene <10 ug/L Fluorene <10 ueL
Anthracene <10 41, Hexachlorobenzene <10 ug'L
Benzidine <50 ug/L Hexachlorobutadiene <10 ug/L
Benzo(a)anthracene <10 ug/L Hexachlorocyclopentadiene <50 ug/L
Benzo(a)pyrene <10 ug/L Hexachloroethane <10 ug/L
Benzo(b)fluoranthene <10 ug/L I ndeno(1,2,3-cd)pyrene <10 ug/L.
Benzo(k)fluoranthene <10 ug/L Isophorone <10 ug/L
Benzo(g,h,i)perylene <10 ug/L 2-Methylnaphthalene <10 ug/L
Benzyl butyl phthalate <10 ug/L Naphthalene <10 ug/L
Bis(2-chloroethoxy)methane <10 ug/L Nitrobenzene <10 ug/L
Bis(2-chloroethyl)ether <10 ug/L N-Nitrosodimethylamine <10 ug/L
Bis(2-chloroisopropyl)ether <10 ug/L N-Nitrosodi-n-propylamine <10 ug/L
Bis(2-ethylhexyl)phthalate <10 ug/L N-Nitrosodiphenylarnine <10 ug/L
4-Bromophenyl phenyl ether <10 ug/L Phenanthrene <10 ug/L
2-Chloronaphthalene <10 ug/L Pyrene <10 ug/L
4-Chlorophenyl phenyl ether <10 ug/L 1,2,4-Trichlorobenzene <10 ug/L
Chrysene <10 ug/L
Dibenzo(a,h)anthracene <10 ug/L 4-Chloro-3-methylphenol <10 ug/L
1,2-Dichlorobenzene <10 ug/L 2-Chlorophenol <10 ug/L
1,3-Dichlorobenzene <10 ug/L 2,4-Dichlorophenol <10 ug/L
1,4-Dichlorobenzene <10 ug/L 2,4-Dimethylphenol <10 ug/L
3,3'-Dichlorobenzidine <50 ug/L 2,4-Dinitrophenol <50 ug/L
Diethyl phthalate <10 ug/L 4,6-Dinitro-2-methylphenol <50 ug/L
Dimethyl phthalate <10 ug/L 2-Nitrophenol <10 ug/L
Di-n-butyl phthalate <10 ug/L 4-Nitrophenol <50 ug/L
2,4-Dinitrotoluene <10 ug/L Pentachlorophenol <50 ug/L
2,6-Dinitrotoluene <10 ug/L Phenol <10 ug/L
Di-n-octyl phthalate <10 ug/L 2,4,6-Trichlorophenol <10 ug/L
1,2-Diphenylhydrazine <10 ug/L
I hereby certify that I have reviewed and approve these data. AZr Lu
Laboratory Representative
642 Tamco Road * Reidsville, NC 27320
[phone] * [e-mail]

MERITECH, INC.
Environmental Laboratories
.•r Laboratory Certification#165
Client: Town of Warrenton WWTP Meritech 1D#: 12121993
Project: PPA Analysis: 12/17/19
Client Sample ID: Effluent Analyst: VWV
Sample Collection: 12/12/19 Dilution Factor: 1
Report Date: 12/19/19
EPA 624.1 VOLATILE ORGANICS
Parameter Result
Benzene < 1.00 ug/L
Dichlorobromomethane 2.38 ug/L
Bromoform < 1.00 ug/L
Methyl Bromide <5.00 ug/L
Carbon Tetrachloride < 1.00 ug/L
Chlorobenzene < 1.00 ug/L
Chloroethane <5.00 ug/L
2-Chioroethyl vinyl ether <5.00 ug/L
Chloroform 7.85 ug/L
Methyl Chloride <5.00 ug/L
Chlorodibromomethane < 1.00 ug/L
1,2-Dibromoethane < 1.00 ug/L
1,1-Dichloroethane < 1.00 ug/L
1,2-Dichloroethane < 1.00 ug/L
1,4-Dichlorobenzene < 1.00 ug/L
1,2-Dichlorobenzene < 1.00 ug/L
1,3-Dichlorobenzene < 1.00 ug/L
1,1-Dichloroethylene < 1.00 ug/L
trans-1,2-Dichloroethylene < 1.00 ug/L
1,2-Dichloropropane < 1.00 ug/L
cis-I,3-Dichloropropylene < 1.00 ug/L
trans-1,3-Dichloropropylene < 1.00 ug/L
Ethyl benzene < 1.00 ug/L
Methylene chloride < 1.00 ug/L
1,1,2,2-Tetrachloroethane < 1.00 ug/L
Tetrachloroethylene < 1.00 ug/L
Toluene < 1.00 ug/L
1,1,1-Trich loroethane < 1.00 ug/L
1,1,2-Trichloroethane < 1.00 ug/L.
Trichloroethylene < 1.00 ug/L
Trichlorofluoromethane <5.00 ug/L
Vinyl chloride <5.00 ug/L
Additional Compounds
Acrolein <50.0 ug/L
Acrylonitrile <10.0 ug/L r
1
thereby certify that! have reviewed and approve these data_
Laboratory Re tative
642 Tamco Road * Reidsville, NC 27320
[phone] * [e-mail]

4.=0 1013 Chain of Custody Record (COC}
CP,r) NPDES#:_NC0020834
MERITECHI INC. .! ;To WarrentonWWTP Phone:_2522571776
Address: P. Q. BOX 281 Fax: [phone]
ENVIRONMENTAL LABORATORIES 738 US Hwy 401 South Email:[e-mail]
t•
642 Tamco Rd. Phone: [phone] Warrenton, NC 27589
Project:
Reidsville NC 27320 Fax:[phone] -
P.U.it:
Email: [e-mail] Attention:_TERESA Turn Around Time*
How would you like your report sent? *RUSH work needs prior approval.
www.meritech-Iabs.com std codas) 3_� pa s 24-4RHrs
Circle all that apply: Email(preferred}, Fax, Mail I _
Sampling Dates & Times Person Taking Sam le(Sign/Print); `�
Sample Location andfor ID If StartEnd Comp? #of .� NICK TYSON Lab Use
_
Test(s) Required i red es / N pH OK?"'
Date Time Date Time Grab? Cont. Yes No CI OK?
EFFLUENT (aiti \icl s' I iakI`) S. (1„_ C ' 1 TDS 1 ,
-
C A NH3, Ntot-(w/HZSOA)1 Sk,-i-
C : 1 Sb,As, Be,Cd,Cr,Cu,Pb,Ni,
P.Se,Ag,TI,Zn,Hardness-(w/HNO3)
C ' 2 EPA,625 BNA
EFFLUENT 11
1. i )G1 t3 - t t G 1 Cyanide-(w/HaOH) Cj 13
G 1 Oil&Grease (w/HCI) ``
_ G 1 Phenols-(w/CuSO4& H2SOR4) �•
3' ...._ , G ` 3 EPA 624+AA-(w/HCI) "`
G Dissolved Oxygen I O,11 Temperature Upon
Method of "*Dechlorination(<0.5 ppm)of Ammonia,Cyyanide,Phenol and TKN samples must be done in the field prior to preservation*** Receipt:
Comments: LLHg on Separate COS 5t'a'4 . 1 A"Ilci - 5s:ka�P C 1 T Ld- {W(,�35d ) -
Shipment: ,,,- ,,\.a1/4 '6.0 I Compositor
_ UPS
---� al Residual Chlorine (��(� mg/L h I`{
ri Jug#
Fed Ex
Are these results for regulatory purposes? Yes U No Li R art results in: mg/L I mg/kg
Reign shed by: r ug/L
Ei Hand Delivery ll I 4a ^/Ci Time: /, y.5 eiv, by: /J �J /i
o{ f/I Alt
j r 7a� // Time: 97
OtherII R uis d !]a a Time: j
l l 1 r.) s� eceived by: Date: Time:
,AERFTECH COURIER ellnquished by: fir,( Date: Time: ! Received by Lab: #jj�
��� � ��. �-� Time: �#

ai MERI TE CH INC.
ilf;40
ENVIRONMENTAL LABORATORIES
Laboratory Certification No. 165
Client: Town of Warrenton WWTP Date Sampled 12/12/19
738 US Hwy 401 South Digested 12/16/19
Warrenton,NC 27589 Analysis 12/20/19
Attention Bill Perkinson Analyst: CWL
NPDES#
EPA 1631 Low Level Mercury Analysis
Meritech ID# Sample ID Result Reporting Limit
MBLK 1220 Method Blank <0.5 ng/L 0.5 ng/L
M12161909 Field Blank < 1.0 ng/L 1.0 ng/L
M12161910 Effluent 4.36 ng/L 1.0 ng/L
I hereby certi that I have reviewed and approve these data.
Laboratory Representative
642 Tamco Rd - PO Box 27 - Reidsville, NC 27320
[phone] Ph - [phone] Fax
E-Mail: [e-mail]

i
3-10.2018
Chain of Custody Record (COC) Ill/IN NPDES#:
MERITECH INC. Client: mi of r-t 0/'Phone:
Address: Fax:
a..4* ENVIRONMENTAL LABORATORIES Email:
le 642 Tamco Rd. Phone: [phone] Project:
Reidsville NC 27320 Fax: [phone] P.O.#:
Email: [e-mail] Attention' How would you like your Report sent?
Circle all that apply: Email (preferred) Fax Mail
WWW.meritechlabs.com EPA 1 631 Person Taking Sample(Sign/Print):
Bottle Tubing Sampler 245.1 Result In House Cooler
Sample Location 1 ID# Date J Time Sampling Site Description Lot# Lot# CH/DH (ppt) Preservation #
01 Field Blank '�°?Ia/f q G! .�? C 1 /A ! s ,)Z1lI Ili a463
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(0 E-F-Fli,02-44 k2X01/07.1G/ i i GI ii II v j
Method of Comments:
Shipment: '5r7 9
❑ UPS
_❑ Fed Ex Are a re ults r reg latory p ses? Yes 1C1K No ❑
Ref hod b Dy �I Time: /c 0 & Received by: Date: Time:
❑ Hand Delivery I ` /
DOther Relinquished Date: Time: Received by: Dale: Time:
_
Relinquished by: Date: Time: Re,Ae' ed by Lab: I Dal : Time:
a �k Q IJw.r.1 � 0�)I(o }ci OKOU
Released to Lab Secure Area Received from Lab Secure Area