NC0025402_Fact Sheet_20210628

Fact Sheet
NPDES Permit No. NC0025402
Permit Writer/Email Contact Nick Coco, [e-mail]:
Date: October 16, 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 2"d 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 Enfield/Enfield Wastewater Treatment Plant (WWTP)
Applicant Address:
PO Box 699, Enfield, NC 27823
Facility Address:
18270 Highway 301 North, Enfield, NC 27823
Permitted Flow:
1.0 MGD
Facility Type/Waste:
MAJOR Municipal; 100% domestic
Facility Class:
Grade IV Biological Water Pollution Control System
Treatment Units:
mechanical bar screen system, grit removal system, influent composite
sampler, influent pump station with 3 pumps and sodium hydroxide
solution addition system, 0.9 MG 3 channel oxidation ditch with
surface aerators and anoxic zone , two (2) 46 ft diameter clarifiers, one
(1) 41 ft x 18 ft chlorine contact basin for chlorination, dechlorination
system , effluent flow meter, effluent composite sampler, effluent pump
station with 3 pumps and estimated 4 miles pressure piping to outfall,
two (2) 0.13 MG aerobic digester with surface aerator and pump, one
(1) 0.34 MG sludge holding tank, emergency generator
Pretreatment Program (Y/N)
N
County:
Halifax
Region
Raleigh
Briefly describe the proposed permitting action and facility background: The Town of Enfield has
applied for an NPDES permit renewal at 1.0 MGD for the Enfield WWTP. This facility serves a
population of approximately 2,530 residents. 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.
Page 1 of 12

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.
Note: The Enfield WWTP discharges its treated wastewater to Fishing Creek via an effluent pump station
through 4 miles of pressure piping. The plant employs gas chlorination, and the residual chlorine is
believed to mitigate potential for recontamination of the treated wastewater in the pipe prior to its release
into the receiving stream.
2. Receiving Waterbodv Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 - Fishing Creek
Stream Index:
28-79-(29)
Stream Classification:
C;NSW
Drainage Area (mi2):
526
Summer 7Q10 (cfs)
20
Winter 7Q10 (cfs):
53.5
30Q2 (cfs):
-
Average Flow (cfs):
526
IWC (% effluent):
7
303(d) listed/parameter:
No
Subject to TMDL/parameter:
Yes- State wide Mercury TMDL implementation.
Subbasin/HUC:
03-03-04/03020102
USGS Topo Quad:
C28NW Enfield, 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
0.41
2.089
0.019
MA 1.0
Total Monthly Flow
MG/month
11.7
26.495
4.095
BOD (summer)
mg/1
3.6
23
2
WA 22.5
MA 15.0
BOD (winter)
mg/1
4.1
24
2
WA 45.0
MA 30.0
TSS
mg/1
5.9
^
2.4
WA 45.0Ail
MA 30.0
NH3N (summer)
mg/1
0.6
0.04
WA 9.0
MA 3.0
NH3N (winter)
mg/1
0.24
2.52
0.04
WA 18.0
MA 6.0
DO
mg/1
7.8
11.65
5.32
DA > 5 mg/1
Fecal coliform
4/100 ml
(ge 3 5 an)
6000
1
(geometric)
WA 400
MA 200
Temperature
° C
19.7
7
Page 2 of 12

pH
SU
6.4
7.6
6
6.0 < pH < 9.0
TRC
µg/1
10.5
24
10
DM 28
TKN
mg/1
1.7
17.53
0.2
NO2+NO3
mg/1
4.9
23.84
0.04
TN
mg/1
6.6
25.78
1.26
TN Load
lb/mo
647
1677
132
TN Load
lb/yr
7572
9409
6723
14,261
TP
mg/1
0.6
4.69
0.07
TP Load
lb/mo
57.8
192
8
TP Load
lb/yr
695
896
491
2,577
MA-Monthlv Average_ WA -Weekly Average_ DM-Dailv Maximum_ DA-Dailv Average OA-
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 and temperature
Upstream near the NCSR 1222 bridge and downstream at the NCSR 1109 bridge. 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 04670000, located upstream of the facility, and station
0469000, located downstream of the facility. The data has been summarized in Table 2 below.
Table 2. Instream Monitoring Coalition Data Summary
Parameter
Units
04670000 Upstream
0469000 Downstream
Average
Max
Min
Average
Max
Min
DO
mg/1
8.4
12.7
4
7.8
13.3
3.7
Temperature
° C
19.2
30.7
3.9
19.2
29.8
4.7
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 not greater than 2.8 degrees Celsius on any occasion during the period
reviewed. It was concluded that no statistically significant difference between upstream and downstream
temperature exists.
Downstream DO dropped below 5 mg/L on one occasion [per 15A NCAC 02B .0211 (6)] during the
period reviewed. This occasion coincided with upstream DO that was below 5 mg/L. It was concluded
that no significant difference between upstream and downstream DO exists.
Page 3 of 12

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 two
ammonia limit violation resulting in enforcement in 2018 and one fecal coliform limit violation resulting
in enforcement in 2019.
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 December 2019 reported that the facility was in compliance with NPDES permit NC0025402
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 HE); 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 were placed in the permit based on the results of a Level B model conducted in 1992
when the facility indicated a desire to relocate their outfall from Beech Swamp to Fishing Creek. 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 12

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 28 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 were placed in the permit based on the results of a Level B model
conducted in 1992 when the facility indicated a desire to relocate their outfall from Beech Swamp to
Fishing Creek. Ammonia -nitrogen limits have been reviewed in the attached WLA and have been found
to be protective. No changes are proposed for ammonia.
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 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: NA
• 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: NA
• 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: NA
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern. (PPAs from 2016, 2017 and 2018)
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: N/A
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
the maximum predicted concentration was <50% of the allowable concentration: Total
Arsenic, Total Beryllium, Total Cadmium, Total Chromium, Total Phenolic Compounds,
Page 5 of 12

Total Copper, Total Cyanide, Total Lead, Total Nickel, Total Selenium, Total Silver,
Total Zinc
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 7%
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 (1.0 MGD)
2016
2017
2018
# of Samples
1
1
1
Annual Average Conc. ng/L
< 200
< 200
4.9
Maximum Conc., ng/L
< 200
< 200
4.9
TBEL, ng/L
47
WQBEL, ng/L
166.84
Describe proposed permit actions based on mercury evaluation: 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, no mercury minimization plan (MMP)
is required. The facility shall report for total mercury using EPA Method 1631E when conducting its
PPAs.
Page 6 of 12

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
(lb/yr)
TP Load
(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
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
Page 7 of 12

• 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: NA
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
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.
Page 8 of 12

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.
As the Enfield 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.
In their comments on the draft permit, the Town of Enfield requested monitoring frequency reductions for
BOD5, Total Suspended Solids, NH3-N and Fecal Coliform based on DWR Guidance Regarding the
Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally Performing Facilities. The last
three years of the facility's data for these parameters have been reviewed in accordance with the criteria
outlined in the guidance. The Division has decided to grant the 2/week monitoring frequency
requirements for BOD5, Total Suspended Solids, NH3-N and Fecal Coliform.
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.
Page 9 of 12

12.Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes 1.0 MGD
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 1.0 MGD
No change
15A NCAC 2B .0505
Total Monthly Flow
Monitor and
Report Monthly
No change
For calculation of TN and TP
Loads
BOD5
Summer:
MA 15.0 mg/1
WA 22.5 mg/1
Winter:
MA 30.0 mg/1
WA 45.0 mg/1
3/week monitoring
No change to limits
2/week monitoring
WQBEL. 1992 Level B model.
15A NCAC 2B; DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
NH3-N
Summer:
MA 3.0 mg/1
WA 9.0 mg/1
Winter:
MA 6.0 mg/1
WA 18.0 mg/1
3/week monitoring
No change to limits
2/week monitoring
WQBEL. 1992 Level B model.
15A NCAC 2B; DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
TSS
MA 30 mg/1
WA 45 mg/1
3/week monitoring
No change to limits
2/week monitoring
TBEL. Secondary treatment
standards/40 CFR 133 / 15A
NCAC 2B .0406; DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
Fecal coliform
MA 200 /100m1
WA 400 /100m1
3/week monitoring
No change to limits
2/week monitoring
WQBEL. State WQ standard, 15A
NCAC 2B; DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
DO
DA > 5 mg/1
Monitor and
Report 3/week
No change to limits
Daily monitoring
WQBEL. State WQ standard, 15A
NCAC 2B .0200; 15A NCAC 02B
.0508 Grade IV facility
Temperature
Monitor and
Report Daily
No change
Surface Water Monitoring, 15A
NCAC 2B. 0508
pH
6 - 9 SU
Monitor and
Report 3/week
No change to limits
Daily monitoring
WQBEL. State WQ standard, 15A
NCAC 2B; 15A NCAC 02B .0508
Grade IV facility
TKN
Monitor and
Report Weekly
No change
For calculation of Total Nitrogen
NO2+NO3
Monitor and
Report Weekly
No change
For calculation of Total Nitrogen
Total Nitrogen
Monitor and
Report Weekly
No change
Tar -Pamlico Nutrient Management
Strategy
T15A NCAC 2B .0730
Page 10 of 12

TN Load
Monitor and
Report Monthly
(as lb/mo)
Annual TN mass
limit of 14,261
lb/yr
No change
WQBEL. Tar -Pamlico Nutrient
Management Strategy
T15A NCAC 2B .0730
Total Phosphorous
Monitor and
Report Weekly
No change
Tar -Pamlico Nutrient Management
Strategy
T15A NCAC 2B .0730
TP Load
Monitor and
Report Monthly
(as lb/mo)
Annual TP mass
limit of 2,577 lb/yr
No change
WQBEL. Tar -Pamlico Nutrient
Management Strategy
T15A NCAC 2B .0730
Chronic Toxicity
Chronic limit,
7% effluent
No change
WQBEL. No toxics in toxic
amounts. 15A NCAC 2B
Effluent Pollutant Scan
Three times per
permit cycle
No change; conducted
in 2022, 2023, 2024
40 CFR 122
Electronic Reporting
Electronic
Reporting Special
Condition
No change
In accordance with EPA Electronic
Reporting Rule 2015.
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: November 10, 2020 and January 29, 2021 (affidavit for second notice received
6/17/2021)
The permit was submitted for a second public comment period due to the reduction in monitoring
frequency granted for BOD, TSS, Fecal Coliform and Ammonia. This change is not considered a minor
modification and thus is subject to public comment.
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.
14. Fact Sheet Addendum (if applicable):
The draft was submitted to the Town of Enfield, SUEZ, EPA Region IV, and the Division's Raleigh
Regional Office, Aquatic Toxicology Branch, Ecosystems Branch and Operator Certification Program for
review. On December 1, 2020, the Town of Enfield submitted comments requesting the facility not be
rerated as a Grade IV facility, with the rationale that the facility's total nitrogen and total phosphorous
Page 11 of 12

load limits are part of an overall basin group limit. However, The Tar -Pamlico Basin Association group
limit allows for some leniency between individual facilities, where if one facility discharges more than
their allocation, but others discharge less by the same amount, then overall compliance is achieved.
However, should that association disband, then the limits would be applied directly to each discharger,
and no leniency would be awarded at all. Participation in the association provides each participant some
overall aid while also protecting the basin, but the dischargers are each considered to have total nitrogen
and total phosphorous limits in their permits. This response is also in the cover letter to the January 25,
2020 draft permit. SUEZ also submitted a formal request for monitoring frequency reductions for TSS,
BOD, ammonia and fecal coliform based on DWR Guidance Regarding the Reduction of Monitoring
Frequencies in NPDES Permits for Exceptionally Performing Facilities. After data and criteria review, the
Division has granted this request. The SUEZ comments are attached to this fact sheet. No comments were
received from any of the other parties.
Were there any changes made since the November 10, 2020 Draft Permit was public noticed (Yes/No):
YES
If Yes, list changes and their basis below:
• A notation was made concerning the Electronic Reporting Rule — Phase 2 Extension. extended
the Phase 2 deadline from December 21, 2020, to December 21, 2025, effective January 4, 2021.
The current compliance date has been extended to reflect this change.
• The mailing address specified in Special Condition A. (2.) Chronic Toxicity Permit Limit
(Quarterly) has been updated.
• Based on NPDES guidance regarding the reduction of monitoring frequencies in NPDES permits
for exceptionally performing facilities, monitoring requirements for BOD5, NH3-N, Total
Suspended Solids and Fecal Coliform have been reduced to twice per week [See A.(1)].
As a result of the changes made to the November 10, 2020 draft permit, a second draft was submitted for
public comment on January 29, 2021.
The draft was submitted to the Town of Enfield, SUEZ, 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 of the parties.
Were there any changes made since the January 29, 2021 Draft Permit was public noticed (Yes/No): NO
If Yes, list changes and their basis below: NA
15. Fact Sheet Attachments (if applicable):
• RPA Spreadsheet Summary
• BOD and TSS Removal
• Dissolved Metals Implementation/Freshwater
• Waste Load Allocation Spreadsheet
• Mercury TMDL Spreadsheet
• Toxicity Summary
• Instream Monitoring Summary
• Renewal Application Addendum
• Monitoring Frequency Reduction Summary
• Town of Enfield Draft Comments
• Affidavit
Page 12 of 12

AFFP
Public Notice
Affidavit of Publication
STATE OF NORTH
CAROLINA }
COUNTY OF HAL]FAX }
SS
Tia Bedwell, being duly sworn, says:
That she is Editor of the The Daily Herald, a Daily
newspaper of general circulation, printed and published in
Roanoke Rapids, Halifax County, North Carolina; that the
publication, a copy of which is attached hereto, was
published in the said newspaper on the following dates:
January 29, 2021
Publisher's Fee: $
That said newspaper
on those dates.
SIGNED:
to
N tttRi+IIIrCO �/i''`/l'
84.30 �p ...
•
was regularly s `- J a� &grufa
PUBLIC _
�i fin'•..
Guil���y`42\��
/mil t 1 i nllt0,�\`
Subscribed to and sworn to me this 29th day of January
2021.
k_atreen_Ct&_
,vly Commission Expires April 29, 2023
40087517 40389890
Wren Thedford
NCDEQ-DWR
1617 Mail Service Center
Raleigh , NC 27699
Public Notice
North Carolina Environmental Management Commission/
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a
NPDES Wastewater Permit NC0025402 Enfield WWTP
The Norlh Carolina Environmental Management Commission proposes to issue a
NPDES wastewater discharge permit to the person(s) listed below. Written
comments regarding the proposed permit will be accepted until 30 days after the
publish date of this notice. The Director of the NC Division of Water Resources
(DWR) may hold a public hearing should there be a significant degree of public
interest. Please mail comments and/or information requests to DWR at the above
address. Interested persons may visit the DWR at 512 N. Salisbury Street, Raleigh,
NC 27604 to review information on file. Additional information on NPDES permits
and this notice may be found on our website: httpJ/deq.nc.govlabout/divisionslwater-
resources/water-resources-perm itslwastewater-branchlnpdes-wastewater/public-
notices,or by calling [phone]. The Town of Enfield fP.O. Box 699, Enfield, NC
27823] has requested renewal of NPDES permit NC0025402 for its Enfield
Wastewater Treatment Plant, located in Halifax County. This permitted facility
discharges treated municipal wastewater to Fishing Creek, a class C-NSW water in
the Tar -Pamlico River Basin. Currently, BOD, ammonia, fecal coliform, pH, dissolved
oxygen, total nitrogen loading and total phosphorous loading are water quality
limited. This discharge may affect future allocations in this segment of Fishing
Creek.
Jan. 29, 2021

Reduction in Frequency Evalaution
Facility:
Enfield WWTP
Permit No.
NC0025402
Review period
(use 3 yrs)
8/2017 - 8/2020
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
violations
N
Data Review
Units
Weekly
average
limit
Monthly
average
limit
50/
MA
3-yr mean
(geo mean
for FC)
<
50%?
200/
MA
# daily
samples
>200%
<15
?
200/
WA
# daily
samples
>200%
<
20?
•
# of non -
monthly
limit
violations
>
2?
# civil penalty
asessment
>
1?
Reduce
Frequency?
(Yes/No)
BOD (summer)
mg/L
22.5
15
7.5
3.4089041
Y
30
0
Y
0
N
0
N
Y
BOD (winter)
mg/L
45
30
15
4.3041451
Y
60
0
Y
0
N
0
N
Y
TSS
mg/L
45
30
15
5.9195652
Y
60
0
Y
0
N
0
N
Y
mmonia (summer;
mg/L
9
3
1.5
0.7064286
Y
6
9
Y
1
N
0
N
Y
Ammonia (winter)
mg/L
18
6
3
0.2628205
Y
12
0
Y
0
N
0
N
Y
Fecal Coliform
#/100
400
200
100
3.1003393
Y
800
9
Y
1
N
0
N
Y

Request For Reduced Monitoring
For Exceptionally Performing Facilities
The Town of Enfield (NPDES NC0025402) is requesting a consideration For Reduced
Monitoring For Exceptionally Performing Facilities. The following criteria has been met:
1. The facility has no more than one civil penalty assessment for permit limit violations
for each target parameter during the previous three years.
2. Neither the permittee nor any of its employees have been convicted of criminal
violations of the Clean Water Act within the previous five years.
3. The facility is not currently under an SOC for target parameter effluent limit
noncompliance.
4. The facility is not on EPA's Quarterly Noncompliance Report for target parameter
limit violations.
5. For BOD5, CBOD5, TSS, NH3-N and TSS, the three year arithmetic mean of
effluent data must be less than fifty percent of the monthly average permit limit. For
fecal coliform or enterococci, the three year geometric mean must be less than 50
percent of the monthly average permit limit. For parameters with summer and winter
limits, an annual arithmetic mean of the seasonal limits may be used in the
calculation. See Attached.
6. With the exception of fecal coliform or enterococci, no more than 15 daily sampling
results over the 3-year review period can be over 200% of the monthly average limit
for BOD5, CBOD5, TSS, or NH3-N . Values associated with documented impacts of
extreme weather or events beyond the control of the permittee will not be included.
See Attached.
7. For fecal coliform or enterococci, no more than 20 daily sampling results may be over
200% of the weekly average limit. Values associated with documented impacts of
extreme weather or events beyond the control of the permittee will not be included.
See Attached.
8. For the four target parameters, sampling results shall not show more than two non -
monthly average limit violations during the previous year.

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
REDUCED MONITORING CRITERIA SUMMARY
1) Requirement: mean < 50% of monthly average
BOD Summer Avg of 4.9 is < 7.5 (50% of BOD Summer Monthly Avg)
TSS Avg of 7.6 is < 15 (50% of TSS Monthly Avg)
Fecal Coliform Geomean Avg of 1 is < 100 (50% of Fecal Coliform Monthly Avg)
NH3-N Winter Avg of 0.27 is < 3 (50% of NH3-N Winter Monthly Avg)
NH3-N Summer Avg of 0.76 is < 1.5 (50% of NH3-N Summer Monthly Avg)
2) No more than 15 daily samples can be > 200% of the weekly average limit
BOD (Winter): 0 Samples > 200% of weekly avg limit
BOD (Summer): 0 Sample > 200% of weekly avg limit
TSS: 0 Samples > 200% of weekly avg limit
NH3-N (Winter): 0 Samples > 200% of weekly avg limit
NH3-N (Summer): 0 Sample > 200% of weekly avg limit.
3) No more than 20 daily samples can be > 200% of the weekly average limit
Fecal Coliform: 8 Samples > 200% of weekly avg limit
4) Sampling results shall not show more than two non -monthly avg. limit violations in past year
0 non -monthly violations

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
9/5/2017
<2.0
6.1
<1
0.10
9/6/2017
2.1
7.2
<1
0.13
9/7/2017
5.4
3.0
17.0
0.10
9/11/2017
<2.0
<2.5
<1
0.20
9/12/2017
2.2
5.6
<1
0.22
9/13/2017
2.9
<2.5
6.0
0.13
9/18/2017
2.7
<2.5
<1
0.11
9/19/2017
<2.0
3.9
13.0
0.10
9/20/2017
<2.0
<2.5
2.0
0.06
9/25/2017
19.0
16.0
<1
0.92
9/26/2017
6.5
19.0
<1
0.18
9/27/2017
<2.0
3.2
6.0
0.09
10/2/2017
<2.0
13.0
6.0
0.04
10/3/2017
<2.0
11.0
6.0
<0.04
10/4/2017
<2.0
6.3
1.0
<0.04
10/9/2017
<2.0
2.6
<1
0.04
10/10/2017
<2.0
<2.6
<1
<0.04
10/11/2017
<2.0
2.6
1.0
<0.04
10/16/2017
<2.0
<2.5
<1
0.04
10/17/2017
<2.0
4.7
<1
0.14
10/18/2017
<2.0
4.2
<1
0.04
10/23/2017
<2.0
5.0
<1
0.04
10/24/2017
<2.0
<2.8
<1
0.58
10/25/2017
2.7
4.0
<1
0.06
10/30/2017
<2.0
2.6
<1
<0.04
10/31/2017
2.5
6.8
<1
0.05
11/1/2017
<2.0
<2.8
<1
0.06
11/6/2017
<2.0
<2.5
<1
0.25
11/7/2017
<2.0
<2.5
<1
0.39
11/8/2017
<2.0
<2.5
<1
0.35
11/13/2017
2.0
4.9
<1
0.08
11/15/2017
<2.0
<2.5
<1
0.09
11/16/2017
<2.0
2.5
<1
0.30
11/20/2017
3.0
7.3
4.0
0.45
11/21/2017
<2.0
<2.5
<1
0.32
11/22/2017
<2.0
7.3
<1
0.10
11/27/2017
2.8
9.9
<1
0.19
11/28/2017
2.0
5.2
1.0
0.26
11/29/2017
<2.0
5.5
<1
0.11
12/4/2017
<2.0
5.9
<1
0.27
12/5/2017
<2.0
3.9
<1
0.44
12/6/2017
<2.0
7.5
<1
0.35

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
12/11/2017
<2.0
<2.5
<1
0.20
12/12/2017
2.5
2.7
<1
0.19
12/13/2017
4.4
3.7
3.0
1.14
12/18/2017
2.4
12.0
<1
0.14
12/19/2017
3.1
6.4
<1
0.07
12/20/2017
2.6
7.4
<1
0.07
12/26/2017
2.8
7.4
1.0
0.12
12/27/2017
2.1
6.1
<1
0.05
12/28/2017
<2.0
12.0
1.0
0.05
1/2/2018
3.2
25.0
<1
0.28
1/3/2018
4.1
13.0
<1
0.22
1/4/2018
4.4
22.0
8.0
2.12
1/8/2018
5.1
14.0
<1
0.06
1/9/2018
3.7
14.0
<1
0.07
1/10/2018
5.8
13.0
<1
<0.04
1/16/2018
2.5
6.4
<1
0.14
1/17/2018
2.2
8.0
<1
0.05
1/18/2018
3.0
11.0
<1
<0.04
1/22/2018
<2.0
3.9
<1
0.06
1/23/2018
2.3
4.7
1.0
0.29
1/24/2018
2.0
5.7
<1
0.13
1/29/2018
4.5
9.1
22.0
0.11
1/30/2018
6.2
11.0
5.0
0.09
1/31/2018
2.6
6.5
2.0
<0.04
2/5/2018
6.0
8.3
<1
0.15
2/6/2018
3.9
23.0
<1
0.11
2/7/2018
<2.0
4.2
<1
0.09
2/12/2018
<2.0
<2.5
1.0
0.08
2/13/2018
2.8
4.8
1.0
<0.04
2/14/2018
2.9
9.9
2.0
0.11
2/20/2018
2.5
5.0
5.0
0.08
2/21/2018
2.4
4.7
<1
0.10
2/22/2018
2.1
3.3
<1
0.10
2/26/2018
<2.0
7.7
1.0
0.12
2/27/2018
<2.0
4.7
<1
0.19
2/28/2018
2.1
3.0,
3.0
0.14
3/5/2018
3.4
4.3
<1
0.30
3/6/2018
2.5
4.9
3.0
0.40
3/7/2018
2.1
<2.9
1.0
0.12
3/12/2018
2.4
4.8
2.0
0.10
3/13/2018
8.4
6.3
5.0
0.08
3/14/2018
3.9
4.7
15.0
0.07

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
3/19/2018
3.7
2.7
2.0
0.05
3/20/2018
4.8
4.1
45.0
0.69
3/21/2018
6.2
6.2
26.0
0.12
3/26/2018
4.9
7.1
1.0
0.05
3/27/2018
3.2
10.0
3.0
0.06
3/28/2018
3.8
17.0
<1
0.06
4/2/2018
2.7
5.1
1.0
0.23
4/3/2018
<2.0
3.9
1.0
0.12
4/4/2018
<2.0
5.1
1.0
0.18
4/9/2018
4.8
13.0
2.0
0.08
4/10/2018
<2.0
<2.6
3.0
0.06
4/11/2018
5.4
13.0
<1
<0.04
4/16/2018
<2.0
<2.5
<1
0.17
4/17/2018
5.1
4.7
5.0
1.10
4/18/2018
2.5
<2.5
1.0
0.18
4/23/2018
<2.0
3.2
4.0
0.30
4/24/2018
11.0
19.0
530.0
0.40
4/25/2018
6.6
8.8
18.0
0.07
4/30/2018
2.2
3.2
<1
0.11
5/1/2018
4.5
14.0
1.0
0.10
5/2/2018
<2.0
3.3
<1
0.07
5/7/2018
6.2
7.2
2900.0
0.19
5/8/2018
9.4
28.0
2.0
0.08
5/9/2018
2.0
5.8
3.0
0.05
5/14/2018
4.2
11.0
827.0
1.56
5/15/2018
7.7
12.0
31.0
0.27
5/16/2018
3.0
9.4
2.0
0.11
5/21/2018
12.0
11.0
230.0
0.06
5/22/2018
2.5
3.1
2.0
0.21
5/23/2018
14.0
12.0
<1
0.19
5/29/2018
<2.0
3.2
<1
0.10
5/30/2018
8.8
23.0
2.0
0.64
5/31/2018
5.9
13.0
<1
0.30
6/4/2018
3.3
<2.6
310.0
0.28
6/5/2018
8.4
13.0
3.0
0.22
6/6/2018
2.2
2.7
609.0
0.07
6/11/2018
<2.0
<2.7
<1
0.32
6/12/2018
2.9
2.7
2.0
0.19
6/13/2018
2.6
3.7
3.0
0.08
6/18/2018
4.2
9.0
4.0
0.21
6/19/2018
3.0
4.5
<1
0.13
6/20/2018
<2.0
<2.6
2.0
0.09

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
mg/L
mg/L
#/100 ml
mg/I
6/25/2018
2.5
<2.6
1.0
0.12
6/26/2018
<2.0
3.5
9.0
0.07
6/27/2018
<2.0
2.5
2.0
0.32
7/2/2018
<2.0
<2.6
<1
0.49
7/3/2018
<2.0
1.0
0.08
7/5/2018
2.2
5.9
<1
0.57
7/6/2018
6.3
7/9/2018
3.1
20.0
6.0
0.06
7/10/2018
2.3
6.8
36.0
0.09
7/11/2018
3.0
7.0
100.0
0.43
7/16/2018
4.0
6.7
1.0
0.14
7/17/2018
`
4.4
12.0
19.0
0.12
7/18/2018
2.8
9.7
2.0
0.25
7/23/2018
3.4
<2.5
6.0
0.39
7/24/2018
2.7
2.6
51.0
0.23
7/25/2018
4.6
3.7
<1
0.35
7/30/2018
2.5
<2.5
1.0
1.10
7/31/2018
3.7
4.5
<1
0.77
8/1/2018
4.6
4.6
5.0
0.40
8/6/2018
2.3
<2.8
1.0
1.30
8/7/2018
<2.0
<2.6
3.0
1.87
8/8/2018
<2.0
5.8
3.0
1.78
8/10/2018
3.9
0.31
8/11/2018
0.17
8/12/2018
0.24
8/13/2018
3.5
<2.8
36.0
0.49
8/14/2018
4.8
6.6
5.0
0.87
8/15/2018
7.8
7.2
4.0
0.92
8/20/2018
<2.0
<2.6
<1
0.25
8/21/2018
<2.0
2.7
<1
0.26
8/22/2018
<2.0
<2.5
<1
0.17
8/27/2018
2.9
<2.6
2.0
0.74
8/28/2018
3.0
<2.8
4.0
1.04
8/29/2018
<2.0
<2.5
<1
1.07
9/5/2018
13.0
5.7
1585.0
3.98
9/6/2018
4.4
4.8
<1
0.63
9/7/2018
2.2
<2.7
34.0
0.15
9/8/2018
0.14
9/9/2018
<2.0
0.10
9/10/2018
<2.0
<2.7
<1
0.09
9/11/2018
<2.0
<2.7
<1
0.07
9/12/2018
2.5
3.2
<1
0.37

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BOD
mg/L
Effluent TSS
mg/L
Effluent Fecal
#/100 ml
Eff NH3 N
mg/I
9/19/2018, 7.6
4.5
2.0
3.64
9/20/2018 3.4
4.3
4.0
0.31
9/21/2018 3.2
<2.6
1.0
0.63
9/24/2018 12.0
28.0
3600.0
1.08
9/25/2018 5.4
9/26/2018 3.6
6.0
7.1
33.0
1.0
1.16
0.44
10/3/2018 3.7
9.3
<1
7.68
10/4/2018 9.7
3.7
27.0
6.46
10/5/2018 5.5
11.0
<1
11.84
10/10/2018 7.7
6.3
4.0
12.56
10/11/2018 15.0
7.5
3.0
15.12
10/12/2018 17.0
11.0
2600.0
15.52
10/17/2018 2.8
10/18/2018 5.9
<2.6
2.6
3.0
1.0.
2.56
1.19
10/19/2018 6.7
3.3
1300.0
1.63
10/24/2018 22.0
12.0
2.0
10.40
10/25/2018 23.0
8.2
<1
9.04
10/26/2018 18.0
6.0
14.0
6.09
10/30/2018 7.6
13.0
3.0
0.21
10/31/2018 3.1
11.0
<1
0.19
11/1/2018 3.5
3.1
<1
0.31
11/5/2018 2.8
4.4
11.0
0.22
11/6/2018 6.1
6.7
<1
0.32
11/7/2018 3.5
5.7
52.0
0.12
11/12/2018 <2.0
<2.7
<1
1.10
11/13/2018 14.0
12.0
1.0
0.54
11/14/2018 5.0
19.0
38.0
0.06
11/15/2018
0.21
11/16/2018
0.10
11/19/2018 <2.0
<2.6
1.0
0.19
11/20/2018 <2.0
2.6
10
0.21
11/21/2018 2.8
2.6
7
0.13
11/26/2018 5.2
2.9
270.0
0.10
11/27/2018 9.3
4.2
4.0
0.13
11/28/2018 2.6
3.5
<1
0.18
12/3/2018 5.4
12/4/2018 2.8
12/5/2018 2.5
12/10/2018 8.8
12/11/2018 25.0
12/12/2018 11.0
12/17/2018. 8.5
4.6
3.7
5.1
4.7
12.0
19.0
5.5
2.0
7.0
2.0
<1
56.0
13.0
60.0
0.19
0.20
0.12
0.31
<0.04
0.16
0.46

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
12/18/2018
10.0
3.5
46.0
0.80
12/19/2018
5.4
<3.4
11.0
1.15
12/26/2018
3.4
<2.6
<1
0.69
12/27/2018
5.6
3.1
4.0
1.03
12/28/2018
4.2
18.0
2.0
0.23
12/31/2018
8.7
25.0
6.0
0.18
1/2/2019
2.4
4.1
5.0
0.19
1/3/2019
7.2
24.0
18.0
0.24
1/7/2019
11.0
4.4
30.0
0.68
1/8/2019
6.4
24.0
12.0
0.09
1/9/2019
6.2
5.9
2.0
0.12
1/14/2019
11.0
5.9
18.0
0.49
1/15/2019
4.0
3.8
3.0
0.10
1/16/2019
<2.0
4.8
1.0
0.23
1/22/2019
3.8
4.4
3.0
0.07
1/23/2019
6.5
9.6
7.0
0.35
1/24/2019
3.6
5.9
7.0
0.08
1/28/2019
8.2
12.0
<1
0.07
1/29/2019
2.9
4.8
6.0
0.04
1/30/2019
5.7
15.0
4.0
0.13
2/4/2019
2.6
7.7
4.0
0.11
2/5/2019
<2.0
3.3
2.0
0.10
2/6/2019
2.1
3.3
2.0
0.18
2/11/2019
2.1
2.9
9.0
0.12
2/12/2019
4.6
12.0
2.0
0.11
2/13/2019
<2.0
2.7
1.0
0.13
2/19/2019
22.0
7.2
510.0
1.37
2/20/2019
18.0
23.0
78.0
1.34
2/21/2019
20.0
28.0
1700.0
1.54
2/25/2019
9.5
13.0
<1
0.07
2/26/2019
6.1
4.9
4.0
0.10
2/27/2019
4.4
2.7
<1
0.28
3/4/2019
11.0
6.3
<1
2.62
3/5/2019
8.7
15.0
1.0
0.05
3/6/2019
8.9
12.0
1.0
<0.04
3/11/2019
4.2
3.1
12.0
0.06
3/12/2019
<2.0
3.3
7.0
0.08
3/13/2019
<2.0
2.7
2.0
0.12
3/18/2019
2.5
2.6
3.0
2.29
3/19/2019
4.7
9.3
1.0
0.30
3/20/2019
4.4
8.4
<1
0.14
3/25/2019
2.9
3.3
<1
0.19

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
3/26/2019
<2.0
2.6
4.0
0.11
3/27/2019
<2.0
3.1
<1
0.07
4/1/2019
3.2
9.3
1.0
0.16
4/2/2019
<2.0
10.0
1.0
0.38
4/3/2019
4.3
4.9
<1
0.35
4/8/2019
3.3
14.0
1.0
0.13
4/9/2019
3.1
6.4
8.0
0.09
4/10/2019
4.9
5.2
<1
0.29
4/15/2019
2.7
2.6
1.0
0.08
4/16/2019
3.0
<2.5
1.0
0.17
4/17/2019
2.5
9.3
1.0
0.24
4/22/2019
2.8
5.7
1.0
0.20
4/23/2019
3.0
8.3
1.0
0.16
4/24/2019
2.8
5.9
3.0
0.22
4/29/2019
<2.0
3.9
1.0
0.41
4/30/2019
<2.0
3.4
<1
0.34
5/1/2019
<2.0
3.4
2.0
1.39
5/6/2019
5.5
5.3
<1
1.00
5/7/2019
4.2
3.9
3.0
1.45
5/8/2019
2.5
6.0
<1
1.00
5/9/2019
0.70
5/10/2019
0.34
5/13/2019
5.0
2.6
5.0
0.98
5/14/2019
2.4
<2.5
3.0
0.82
5/15/2019
<2.0
<2.5
<1
0.38
5/17/2019
0.19
5/18/2019
0.17
5/20/2019
4.5
8.4
5.0
0.25
5/21/2019
3.1
<2.8
<1
0.20
5/22/2019
2.0
<2.7
1.0
0.39
5/28/2019
3.1
3.6
<1
0.63
5/29/2019
6.3
4.8
<1
0.87
5/30/2019
2.5
3.4
5.0
0.26
6/3/2019
2.3
<2.6
<1
0.91
6/4/2019
2.0
<2.6
<1
0.25
6/5/2019
<2.0
<2.6
2.0
0.13
6/10/2019
2.3
3.0
12.0
0.14
6/11/2019
3.1
3.6
<1
0.16
6/12/2019
<2.0
4.1
1.0
0.15
6/17/2019
2.2
<2.5
<1
0.15
6/18/2019
2.6
2.5
<1
0.30
6/19/2019
<2.0
2.6
1.0,
0.52

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS 1
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
#/100 ml
mg/I
6/24/2019
<2.0
4.6
1.0
0.50
6/25/2019
3.3
<2.5
25.0
0.66
6/26/2019
3.6
3.1
<1
0.67
6/27/2019
0.38
6/28/2019
0.30
6/29/2019
0.46
7/1/2019
3.4
2.8
4.0
0.23
7/2/2019
3.3
3.0
<1
0.25
7/3/2019
2.5
2.6
<1
0.21
7/8/2019
5.9
6.0
1.0
0.26
7/9/2019
4.1
<2.6
4.0
0.22
7/10/2019
7.5
12.0
1.0
0.77
7/15/2019
4.2
4.2
23.0
2.08
7/16/2019
4.9
5.0
5.0
2.33
7/17/2019
2.8
<2.5
17.0
1.40
7/22/2019
<2.0
<2.7
1.0
1.76
7/23/2019
<2.0
<2.5
11.0
1.40
7/24/2019
2.6
3.1
<1
0.79
7/25/2019
0.25
7/26/2019
0.14
7/27/2019
0.16
7/29/2019
3.1
3.1
15.0
0.16
7/30/2019
2.9
4.8
2.0
0.47
7/31/2019
<2.0
<2.6
1.0
0.24
8/5/2019
3.9
6.0
<1
0.29
8/6/2019
<2.0
<2.5
2.0
0.68
8/7/2019
6.1
11.0
18.0
0.76
8/12/2019
<2.0
<2.5
19.0
0.16
8/13/2019
2.3
<2.6
1.0
0.39
8/14/2019
5.3
4.7
25.0
0.24
8/19/2019
6.0
5.5
36.0
0.57
8/20/2019
3.9
<2.7
15.0
0.54
8/21/2019
4.0
3.5
32.0
0.72

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
mg/L
mg/L
#/100 ml
mg/I
8/26/2019
3.7
11.0
5.0
1.08
8/27/2019
8.2
21.0
23.0
0.35
8/28/2019
2.7
3.5
2.0
0.25
9/3/2019
<2.0
3.7
6.0
1.37
9/4/2019
<2.0
<2.6
4.0
0.40
9/5/2019
<2.0
<2.6
<1
1.16
9/9/2019
3.3
2.6
40.0
0.07
9/10/2019
<2.0
3.1
<1
0.10
9/11/2019
<2.0
3.0
4.0
0.27
9/16/2019
2.5
8.4
<1
0.65
9/17/2019
2.1
8.2
<1
0.33
9/18/2019
5.1
4.1
<1
0.45
9/23/2019
3.9
9.9
1.0
4.71
9/24/2019
3.9
<2.6
3.0
1.19
9/25/2019
<2.0
<2.6
<1
1.07
9/28/2019
0.66
9/30/2019
3.2
2.6
2.0
0.29
10/1/2019
3.0
<2.5
<1
0.47
10/2/2019
2.3
<2.6
<1
0.44
10/7/2019
3.7
8.1
86.0
1.15
10/8/2019
3.5
17.0
18.0
0.49
10/9/2019
<2.0
<2.8
3.0
0.10
10/14/2019
<2.0
4.1
55.0
0.23
10/15/2019
<2.0
2.8
<1
0.06
10/16/2019
<2.0
3.1
3.0
0.09
10/21/2019
12.0
5.3
21.0
0.95
10/22/2019
3.3
7.0
3.0
0.12
10/23/2019
<2.0
<2.5
18.0
0.18
10/28/2019
<2.0
<2.5
<1
0.61
10/29/2019
<2.0
<2.5
1.0
0.35
10/30/2019
3.2
3.3
<1
0.31
11/4/2019
2.2
4.0
<1
0.12
11/5/2019
2.3
2.6
1.0
0.26
11/6/2019
2.2
3.4
3.0
0.20
11/11/2019
<2.0
3.9
_ <1
0.14
11/12/2019
4.3
3.5
5.0
0.13
11/13/2019
3.1
<2.5
17.0
0.33
11/18/2019
3.7
4.3
51.0
0.19
11/19/2019
5.7
9.5
54.0
0.13
11/20/2019
4.1
3.4
45.0
0.18
11/25/2019
6.5
2.7
4.0
0.22
11/26/2019
4.4
6.2
26.0
0.10

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
Date
mg/L
mg/L
4*/100 ml
mg/I
11/27/2019
5.2
5.1
23.0
0.15
12/2/2019
4.2
<2.6
200.0
0.29
12/3/2019
5.2
30.0
118.0
0.14
12/4/2019
6.2
5.9
82.0
0.12
12/9/2019
3.6
7.4
38.0
0.15
12/10/2019
2.8
4.4
48.0
0.18
12/11/2019
3.5
4.2
220.0
0.13
12/16/2019
3.0
12.0
37.0
0.14
12/17/2019
5.3
11.0
9.0
0.18
12/18/2019
<2.0
<2.5
31.0
0.21
12/23/2019
4.4
4.1
33.0
0.11
12/26/2019
3.9
4.8
39.0
0.10
12/27/2019
4.3
16.0
_ 3.0
0.17
12/30/2019
2.7
3.2
31.0
0.10
12/31/2019
<2.0
<2.5
53.0
0.15
1/2/2020
4.0
6.9
14.0
0.23
1/6/2020
3.8
2.6
21.0
0.09
1/7/2020
3.2
2.7
91.0
0.10
1/8/2020
<2.0
3.8
18.0
0.18
1/13/2020
5.0
5.0
43.0
0.22
1/14/2020
3.8
6.0
1.0
0.27
1/15/2020
8.4
5.0
4.0
0.81
1/21/2020
11.0
37.0
75.0
0.14
1/22/2020
15.0
22.0
6.0
0.13
1/23/2020
5.7
8.4
2.0
0.34
1/27/2020
7.8
4.3
<1
0.48
1/28/2020
10.0
3.5
14.0
1.07
1/29/2020
11.0
2.9
<1
0.24
2/3/2020
12.0
40.0
54.0
0.09
2/4/2020
9.2
19.0
44.0
0.12
2/5/2020
4.4
11.0
26.0
0.16
2/10/2020
7.5
7.3
43.0
0.15
2/11/2020
3.3
5.8
17.0
0.08
2/12/2020
<2.0
<2.5
21.0
0.04
2/18/2020
<2.0
<2.5
<1
0.11
2/19/2020
<2.0
<2.5
40.0
<0.04
2/20/2020
<2.0
<2.5
7.0
0.08
2/24/2020
4.1
3.0
0.06
2/25/2020
<2.0
<5.0
1.0
<0.04
2/26/2020
<2.0
<2.5
5.0
0.09
2/28/2020
<2.0
3/2/2020
<2.0
<2.5
1.0
0.05

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
mg/L
mg/L
#/100 ml
mg/I
3/3/2020
<2.0
<2.5
1.0
0.06
3/4/2020
<2.0
<2.5
3000.0
0.07
3/9/2020
<2.0
2.7
25.0
0.09
3/10/2020
<2.0
2.5
8.0
0.10
3/11/2020
<2.0
<2.5
17.0
0.05
3/16/2020
4.8
19.0
3.0
1.13
3/17/2020
2.7
7.0
4.0
0.85
3/18/2020
<2.0
<2.5
3.0
0.52
3/23/2020
3.2
3.5
14.0
0.21
3/24/2020
5.1
6.3
8.0
0.05
3/25/2020
4.7
4.7
<1
0.14
3/30/2020
9.1
13.0
1.0
0.77
3/31/2020
7.2
18.0
4.0
0.57
4/1/2020
<2.0
3.3
19.0
0.37
4/6/2020
<2.0
2.6
20.0
0.14
4/7/2020
<2.0
2.6
<1
0.06
4/8/2020
4.8
15.0
5.0
0.38
4/13/2020
<2.0
<2.5
11.0
0.10
4/14/2020
<2.0
<2.5
6.0
0.08
4/15/2020
<2.0
<2.5
16.0
0.06
4/20/2020
<2.0
<2.5
37.0
0.06
4/21/2020
<2.0
<2.5
21.0
0.05
4/22/2020
<2.0
<2.5
34.0
0.05
4/27/2020
<2.0
3.8
53.0
0.09
4/28/2020
5.4
35.0
23.0
0.40
4/30/2020
<2.0
11.0
7.0
0.10
5/1/2020
0.43
5/2/2020
0.10
5/4/2020
2.6
3.5
20.0
0.08
5/5/2020
<2.0
3.0
290.0
0.15
5/6/2020
4.5
9.1
<1
0.34
5/11/2020
<2.0
2.5
8.0
0.18
5/12/2020
5.9
18.0
<1
0.15
5/13/2020
<2.0
<2.5
<1
0.08
5/18/2020
8.2
19.0
1.0
0.15
5/19/2020
<2.0
3.6
24.0
0.09
5/20/2020
<2.0
2.5
14.0
0.05
5/26/2020
<2.0
<2.5
7.0
0.05
5/27/2020
<2.0
<2.5
3.0
0.06
5/28/2020
3.1
8.2
<1
0.10
6/1/2020
<2.0
<2.5
11.0
0.05
6/2/2020
<2.0
<2.5
4.0
0.11

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BOD
Effluent TSS
Effluent Fecal
Eff NH3 N
mg/L
mg/L
#/100 ml
mg/I
6/3/2020
<2.0
4.6
12.0
0.07
6/8/2020
<2.0
<2.5
7.0
0.12
6/9/2020
<2.0
<2.5
4.0
0.24
6/10/2020
<2.0
<2.5
1.0
0.06
6/15/2020
<2.0
<2.5
<1
0.09
6/16/2020
<2.0
<2.5
3.0
0.06
6/17/2020
14.0
22.0
3.0
0.04
6/22/2020
<2.0
<2.5
550.0
<0.04
6/23/2020
11.0
26.0
1.0
0.11
6/24/2020
<2.0
<2.5
<1
0.09
6/29/2020
<2.0
<2.5
1.0
0.10
6/30/2020
3.0
2.8
4.0
0.30
7/1/2020
9.3
21.0
8.0
0.19
7/6/2020
<2.0
<2.5
29.0
0.05
7/7/2020
5.4
7.6
16.0
0.48
7/8/2020
<2.0
<2.5
4.0
0.13
7/13/2020
5.1
2.7
3.0
0.14
7/14/2020
4.7
3.4
<1
0.21
7/15/2020
3.9
2.7
14.0
0.20
7/20/2020
3.9
<2.5
3.0
0.06
7/21/2020
8.4
6.9
5.0
1.35
7/22/2020
3.1
2.5
4.0
0.92
7/27/2020
3.1
<2.5
6.0
0.07
7/28/2020
2.1
<2.5
<1
0.07
7/29/2020
2.2
<2.5
3.0
0.14
8/3/20201
3.0
<2.5
<1
0.11
8/4/2020
2.4
<2.5
>6,000
0.08
8/5/2020
<2.0
6.9
15.0
0.14
8/10/2020
3.1
2.5
<1
0.08
8/11/2020
<2.0
7.4
5.0
0.43
8/12/2020
2.9
<2.5
1.0
0.62
8/17/2020
3.4
4.9
77.0
1.18
8/18/2020
3.2
2.6
1.0
1.15
8/19/2020i
2.5
4.6
<1
1.23
8/24/2020
<2.0
2.5
8.0
0.94
8/25/2020
3.1
<2.5
<1
0.27
8/26/2020
4.0
3.6
<1
0.70

ATTACHEMENT I
REQUEST FOR REDUCED MONITORING FOR EXCEPTIONALLY PERFORMING FACILITIES
Town of Enfield WWTP (NC0025402)
DMR Data (9/1/2017 - 8/31/2020)
Date
Effluent BO❑
Effluent TSS
Effluent Fecal
Eff NH3 N
mg/L
mg/L
I000 rnl
mg/1
Average
5.1
7.6
1.0
0.6
NPDES Monthly
Avg Limit
30
200
50% of Monthly
Average Limit
15
100
200% of Weekly
Avg
90
800
# samples a
200% of Weekly
Avg
0
8

WINTER MONTHS
Effluent BOD
Date
mg/L
11/1/2017
<2.0
11/6/2017
<2.0
11/7/2017
<2.0
11/8/2017
<2.0
11/13/2017
2.0
11/15/2017
<2.0
11/16/2017
<2.0
11/20/2017
3.0
11/21/2017
<2.0
11/22/2017
<2.0
11/27/2017
2.8
11/28/2017
2.0
11/29/2017
<2.0
12/4/2017
<2.0
12/5/2017
<2.0
12/6/2017
<2.0
12/11/2017
<2.0
12/12/2017
2.5
12/13/2017
4.4
12/18/2017
2.4
12/19/2017
3.1
12/20/2017
2.6
12/26/2017
2.8
12/27/2017
2.1
12/28/2017
<2.0
1/2/2018
3.2
1/3/2018
4.1
1/4/2018
4.4
1/8/2018
5.1
1/9/2018
3.7
1/10/2018
5.8
1/16/2018
2.5
1/17/2018
2.2
1/18/2018
3.0
1/22/2018
<2.0
1/23/2018
2.3
1/24/2018
2.0
1/29/2018
4.5
1/30/2018
6.2
1/31/2018
2.6
2/5/2018
6.0
2/6/2018
3.9
A11hl1171�
Date
Effluent BOD
mg/L
9/5/2017
<2.0
9/6/2017
2.1
9/7/2017
5.4
9/11/2017
<2.0
9/12/2017
2.2
9/13/2017
2.9
9/18/2017
2.7
9/19/2017
<2.0
9/20/2017
<2.0
9/25/2017
19.0
9/26/2017
6.5
9/27/2017
<2.0
10/2/2017
<2.0
10/3/2017
<2.0
10/4/2017
<2.0
10/9/2017
<2.0
10/10/2017
<2.0
10/11/2017
<2.0
10/16/2017
<2.0
10/17/2017
<2.0
10/18/2017
<2.0
10/23/2017
<2.0
10/24/2017
<2.0
10/25/2017
2.7
10/30/2017
<2.0
10/31/2017
2.5
4/2/2018
2.7
4/3/2018
<2.0
4/4/2018
<2.0
4/9/2018
4.8
4/10/2018
<2.0
4/11/2018
5.4
4/16/2018
<2.0
4/17/2018
5.1
4/18/2018
2.5
4/23/2018
<2.0
4/24/2018
11.0
4/25/2018
6.6
4/30/2018
2.2
5/1/2018
4.5
5/2/2018
<2.0
5/7/2018
6.2

WINTER MONTHS
Effluent BOD
Date
mg/L
2/7/2018
<2.0
2/12/2018
<2.0
2/13/2018
2.8
2/14/2018
2.9
2/20/2018
2.5
2/21/2018
2.4
2/22/2018
2.1
2/26/2018
<2.0
2/27/2018
<2.0
2/28/2018
2.1
3/5/2018
3.4
3/6/2018
2.5
3/7/2018
2.1
3/12/2018
2.4
3/13/2018
8.4
3/14/2018
3.9
3/19/2018
3.7
3/20/2018
4.8
3/21/2018
6.2
3/26/2018
4.9
3/27/2018
3.2
ti
3/28/2018
3.8
11/1/2018
3.5
11/5/2018
2.8
11/6/2018
6.1
11/7/2018
3.5
11/12/2018
<2.0
11/13/2018
14.0
11/14/2018
5.0
11/15/2018
11/16/2018
11/19/2018
<2.0
11/20/2018
<2.0
11/21/2018
2.8
11/26/2018
5.2
11/27/2018
9.3
11/28/2018
2.6
12/3/2018
5.4
12/4/2018
2.8
12/5/2018
2.5
12/10/2018
8.8
12/11/2018
25.0
Effluent BOD
Date
mg/L
5/8/2018
9.4
5/9/2018
2.0
5/14/2018
4.2
5/15/2018
7.7
5/16/2018
3.0
5/21/2018
12.0
5/22/2018
2.5
5/23/2018
14.0
5/29/2018
<2.0
5/30/2018
8.8
5/31/2018
5.9
6/4/2018
3.3
6/5/2018
8.4
6/6/2018
2.2
6/11/2018
<2.0
6/12/2018
2.9
6/13/2018
2.6
6/18/2018
4.2
6/19/2018
3.0
6/20/2018
<2.0
6/25/2018
2.5
6/26/2018
<2.0
6/27/2018
<2.0
7/2/2018
<2.0
7/3/2018
<2.0
7/5/2018
2.2
7/6/2018
7/9/2018
3.1
7/10/2018
2.3
7/11/2018
3.0
7/16/2018
4.0
7/17/2018
4.4
7/18/2018
2.8
7/23/2018
3.4
7/24/2018
2.7
7/25/2018
4.6
7/30/2018
2.5
7/31/2018
3.7
8/1/2018
4.6
8/6/2018
2.3
8/7/2018
<2.0
8/8/2018
<2.0

WINTER MONTHS
Date
Effluent BOD
mg/L
12/12/2018
11.0
12/17/2018
8.5
12/18/2018
10.0
12/19/2018
5.4
12/26/2018
3.4
12/27/2018
5.6
12/28/2018
4.2
12/31/2018
8.7
1/2/2019
2.4
1/3/2019
7.2
1/7/2019
11.0
1/8/2019
6.4
1/9/2019
6.2
1/14/2019
11.0
1/15/2019
4.0
1/16/2019
<2.0
1/22/2019
3.8
1/23/2019
6.5
1/24/2019
3.6
1/28/2019
8.2
1/29/2019
2.9
1/30/2019
5.7
2/4/2019
2.6
2/5/2019
<2.0
2/6/2019
2.1
2/11/2019
2.1
2/12/2019
4.6
2/13/2019
<2.0
2/19/2019
22.0
2/20/2019
18.0
2/21/2019
20.0
2/25/2019
9.5
2/26/2019
6.1
2/27/2019
4.4
3/4/2019
11.0
3/5/2019
8.7
3/6/2019
8.9
3/11/2019
4.2
3/12/2019
<2.0
3/13/2019
<2.0
3/18/2019
2.5
3/19/2019, 4.7
SUMMER MONTHS
Effluent BOD
Date mg/L
8/10/2018 3.9
8/11/2018
8/12/2018
8/13/2018 3.5
8/14/2018 4.8
8/15/2018 7.8
8/20/2018 <2.0
8/21/2018 <2.0
8/22/2018 <2.0
8/27/2018 2.9
8/28/2018 3.0
8/29/2018 <2.0
9/5/2018 13.0
9/6/2018 4.4
9/7/2018 2.2
9/8/2018
9/9/2018 <2.0
9/10/2018 <2.0
9/11/2018 <2.0
9/12/2018 2.5
9/19/2018 7.6
9/20/2018 3.4
9/21/2018 3.2
9/24/2018 12.0
9/25/2018 5.4
9/26/2018 3.6
10/3/2018 3.7
10/4/2018 9.7
10/5/2018 5.5
10/10/2018 7.7
10/11/2018 15.0
10/12/2018 17.0
10/17/2018 2.8
10/18/2018 5.9
10/19/2018 6.7
10/24/2018 22.0
10/25/2018 23.0
10/26/2018 18.0
10/30/2018 7.6
10/31/2018 3.1
4/1/2019 3.2
4/2/2019 <2.0

WINTER MONTHS
Date
Effluent BOD
mg/L
3/20/2019
4.4
3/25/2019
2.9
3/26/2019
<2.0
3/27/2019
<2.0
11/4/2019
2.2
11/5/2019
2.3
11/6/2019
2.2
11/11/2019
<2.0
11/12/2019
4.3
11/13/20194
3.1
11/18/2019
3.7
11/19/2019
5.7
11/20/2019
4.1
11/25/2019
6.5
11/26/2019
4.4
11/27/2019
5.2
12/2/2019
4.2
12/3/2019
5.2
12/4/2019
6.2
12/9/2019
3.6
12/10/2019
2.8
12/11/2019
3.5
12/16/2019
3.0
12/17/2019
5.3
12/18/2019
<2.0
12/23/2019
4.4
12/26/2019
3.9
12/27/2019
4.3
12/30/2019
2.7
12/31/2019
<2.0
1/2/2020
4.0
1/6/2020
3.8
1/7/2020
3.2
1/8/2020
<2.0
1/13/2020
5.0
1/14/2020
3.8
1/15/2020
8.4
1/21/2020
11.0
1/22/2020
15.0
1/23/2020
5.7
1/27/2020
7.8
1/28/2020
10.0
SUMMER MONTHS
Date
Effluent BOD
mg/L
4/3/2019
4.3
4/8/2019
3.3
4/9/2019
3.1
4/10/2019
4.9
4/15/2019
2.7
4/16/2019
3.0
4/17/2019
2.5
4/22/2019
2.8
4/23/2019
3.0
4/24/2019
2.8
4/29/2019
<2.0
4/30/2019
<2.0
5/1/2019
<2.0
5/6/2019
5.5
5/7/2019
4.2
5/8/2019
2.5
5/9/2019
5/10/2019
5/13/2019
5.0
5/14/2019
2.4
5/15/2019
<2.0
5/17/2019
5/18/2019
5/20/2019
4.5
5/21/2019
3.1
5/22/2019
2.0
5/28/2019
3.1
5/29/2019
6.3
5/30/2019
2.5
6/3/2019
2.3
6/4/2019
2.0
6/5/2019
<2.0
6/10/2019
2.3
6/11/2019
3.1
6/12/2019
<2.0
6/17/2019
2.2
6/18/2019
2.6
6/19/2019
<2.0
6/24/2019
<2.0
6/25/2019
3.3
6/26/2019
3.6
6/27/2019

WINTER. MOTHS
Effluent BOD
Date
mg/L
1/29/2020
11.0
2/3/2020
12.0
2/4/2020
9.2
2/5/2020
4.4
2/10/2020
7.5
2/11/2020
3.3
2/12/2020
<2.0
2/18/2020
<2.0
2/19/2020
<2.0
2/20/2020
<2.0
2/24/2020
2/25/2020
<2.0
2/26/2020
<2.0
2/28/2020
<2.0
3/2/2020
<2.0
3/3/2020
<2.0
3/4/2020
<2.0
3/9/2020
<2.0
3/10/2020
<2.0
3/11/2020
<2.0
3/16/2020
4.8
3/17/2020
2.7
3/18/2020
<2.0
3/23/2020
3.2
3/24/2020
5.1
3/25/2020
4.7
3/30/2020
9.1
3/31/2020
7.2
SUMMER matanS
Date
Effluent BOD
mg/L
6/28/2019
6/29/2019
7/1/2019
3.4
7/2/2019
3.3
7/3/2019
2.5
7/8/2019
5.9
7/9/2019
4.1
7/10/2019
7:5
7/15/2019
4.2
7/16/2019
4.9
7/17/2019
2.8
7/22/2019
<2.0
7/23/2019
<2.0
7/24/2019
2.6
7/25/2019
7/26/2019
7/27/2019
7/29/2019
3.1
7/30/2019
2.9
7/31/2019
<2.0
8/5/2019
3.9
8/6/2019
<2.0
8/7/2019
6.1
8/12/2019
<2.0
8/13/2019
2.3
8/14/2019
5.3
8/19/2019
6.0
8/20/2019
3.9
8/21/2019
4.0
8/26/2019
3.7
8/27/2019
8.2
8/28/2019
2.7
9/3/2019
<2.0
9/4/2019
<2.0
9/5/2019
<2.0
9/9/2019
3.3
9/10/2019
<2.0
9/11/2019
<2.0
9/16/2019
2.5
9/17/2019
2.1
9/18/2019
5.1
9/23/2019
3.9

WINTER MONTHS
Date
Effluent BOD
mg/L
MONTHS
Effluent BOD
Date
mg/L
9/24/2019
3.9
9/25/2019
<2.0
9/28/2019
9/30/2019
3.2
10/1/2019
3.0
10/2/2019
2.3
10/7/2019
3.7
10/8/2019
3.5
10/9/2019
<2.0
10/14/2019
<2.0
10/15/2019
<2.0
10/16/2019
<2.0
10/21/2019
12.0
10/22/2019
3.3
10/23/2019
<2.0
10/28/2019
<2.0
10/29/2019
<2.0
10/30/2019
3.2
4/1/2020
<2.0
4/6/2020
<2.0
4/7/2020
<2.0
4/8/2020
4.8
4/13/2020
<2.0
4/14/2020
<2.0
4/15/2020
<2.0
4/20/2020
<2.0
4/21/2020
<2.0
4/22/2020
<2.0
4/27/2020
<2.0
4/28/2020
5.4
4/30/2020
<2.0
5/1/2020
5/2/2020
5/4/2020
2.6
5/5/2020
<2.0
5/6/2020
4.5
5/11/2020
<2.0
5/12/2020
5.9
5/13/2020
<2.0
5/18/2020
8.2
5/19/2020
<2.0
5/20/2020
<2.0

MIER MONTHS
Effluent BOD
Date
Effluent BOD
Date
mg/L
5/26/2020
<2.0
5/27/2020
<2.0
5/28/2020
3.1
6/1/2020
<2.0
6/2/2020
<2.0
6/3/2020
<2.0
6/8/2020
<2.0
6/9/2020
<2.0
6/10/2020
<2.0
6/15/2020
<2.0
6/16/2020
<2.0
6/17/2020
14.0
6/22/2020
<2.0
6/23/2020
11.0
6/24/2020
<2.0
6/29/2020
<2.0
6/30/2020
3.0
7/1/2020
9.3
7/6/2020
<2.0
7/7/2020
5.4
7/8/2020
<2.0
7/13/2020
5.1
7/14/2020
4.7
7/15/2020
3.9
7/20/2020
3.9
7/21/2020
_ 8.4
7/22/2020
3.1
7/27/2020
3.1
7/28/2020
2.1
7/29/2020
2.2
8/3/2020
3.0
8/4/2020
2.4
8/5/2020
<2.0
8/10/2020
3.1
8/11/2020
<2.0
8/12/2020
2.9
8/17/2020
3.4
8/18/2020
3.2
8/19/2020
2.5
8/24/2020
<2.0
8/25/2020
3.1
8/26/2020
4.0

WINTER mous
Date
Effluent BOD
mg/L
Average
5.4
NPDES Monthly Avg
Limit (Winter)
30
50% of Monthly
Average Limit
15
200% of Weekly Avg
90
# samples > 200% of
Weekly Avg
0
SUMMER MONTHS
Date
Effluent BOD
mg/L
Average
4.9
NPDES Monthly
Avg Limit
(Summer)
15
50% of Monthly
Average Limit
7.5
200% of Weekly
Avg
45
i# samples >
200% of Weekly
Avg
0

WINTER MONTHS
Effluent NH3-N
Date
mg/L
11/1/2017
0.06
11/6/2017
0.25
11/7/2017
0.39
11/8/2017
0.35
11/13/2017
0.08
11/15/2017
0.09
11/16/2017
0.30
11/20/2017
0.45
11/21/2017
0.32
11/22/2017
0.10
11/27/2017
0.19
11/28/2017
0.26
11/29/2017
0.11
12/4/2017
0.27
12/5/2017
0.44
12/6/2017
0.35
12/11/2017
0.20
12/12/2017
0.19
12/13/2017
1.14
12/18/2017
0.14
12/19/2017
0.07
12/20/2017
0.07
12/26/2017
0.12
12/27/2017
0.05
12/28/2017
0.05
1/2/2018
0.28
1/3/2018
0.22
1/4/2018
2.12
1/8/2018
0.06
1/9/2018
0.07
1/10/2018
<0.04
1/16/2018
0.14
1/17/2018
0.05
1/18/2018
<0.04
1/22/2018
0.06
1/23/2018
0.29
1/24/2018
0.13
1/29/2018
0.11
1/30/2018
0.09
1/31/2018
<0.04
2/5/2018
0.15
2/6/2018
0.11
SUMMER MONTHS
Date
Effluent NH3-N
mg/L
9/5/2017
0.10
9/6/2017
0.13
9/7/2017
0.10
9/11/2017
0.20
9/12/2017
0.22
9/13/2017
0.13
9/18/2017
0.11
9/19/2017
0.10
9/20/2017
0.06
9/25/2017
0.92
9/26/2017
0.18
9/27/2017
0.09
10/2/2017
0.04
10/3/2017
<0.04
10/4/2017
<0.04
10/9/2017
0.04
10/10/2017
<0.04
10/11/2017
<0.04
10/16/2017
0.04
10/17/2017
0.14
10/18/2017
0.04
10/23/2017
0.04
10/24/2017
0.58
10/25/2017
0.06
10/30/2017
<0.04
10/31/2017
0.05
4/2/2018
0.23
4/3/2018
0.12
4/4/2018
0.18
4/9/2018
0.08
4/10/2018
0.06
4/11/2018
<0.04
4/16/2018
0.17
4/17/2018
1.10
4/18/2018
0.18
4/23/2018
0.30
4/24/2018
0.40
4/25/2018
0.07
4/30/2018
0.11
5/1/2018
0.10
5/2/2018
0.07
5/7/2018
0.19

WINTER MONTHS
Date
Effluent NH3-N
mg/L
2/7/2018
0.09
2/12/2018
0.08
2/13/2018
<0.04
2/14/2018
0.11
2/20/2018
0.08
2/21/2018
0.10
2/22/2018
0.10
2/26/2018
0.12
2/27/2018
0.19
2/28/2018
0.14
3/5/2018
0.30
3/6/2018
0.40
3/7/2018
0.12
3/12/2018
0.10
3/13/2018
0.08
3/14/2018
0.07
3/19/2018
0.05
3/20/2018
0.69
3/21/2018
0.12
3/26/2018
0.05
3/27/2018
0.06
3/28/2018
0.06
11/1/2018
0.31
11/5/2018
0.22
11/6/2018
0.32
11/7/2018
0.12
11/12/2018
1.10
11/13/2018
0.54
11/14/2018
0.06
11/15/2018
0.21
11/16/2018
0.10
11/19/2018
0.19
11/20/2018
0.21
11/21/2018
0.13
11/26/2018
0.10
11/27/2018
0.13
11/28/2018
0.18
12/3/2018
0.19
12/4/2018
0.20
12/5/2018
0.12
12/10/2018
0.31
12/11/2018
<0.04
5.uMMER MONTHS
Date
Effluent NH3-N
mg/L
5/8/2018
0.08
5/9/2018
0.05
5/14/2018
1.56
5/15/2018
0.27
5/16/2018
0.11
5/21/2018
0.06
5/22/2018
0.21
5/23/2018
0.19
5/29/2018
0.10
5/30/2018
0.64
5/31/2018
6/4/2018
6/5/2018
6/6/2018
0.30
0.28
0.22
0.07
I.
6/11/2018
0.32
6/12/2018
0.19
6/13/2018
0.08
6/18/2018
0.21
6/19/2018
0.13
6/20/2018
0.09
6/25/2018
0.12
6/26/2018
0.07
6/27/2018
0.32
7/2/2018
0.49
7/3/2018
0.08
7/5/2018
0.57
7/6/2018
7/9/2018
0.06
7/10/2018
0.09
7/11/2018
0.43
7/16/2018
0.14
7/17/2018
0.12
7/18/2018
0.25
7/23/2018
0.39
7/24/2018
0.23
7/25/2018
0.35
7/30/2018
1.10
7/31/2018
0.77
8/1/2018
0.40
8/6/2018
1.30
8/7/2018
1.87
8/8/2018
1.78

WINTER MONTHS
Effluent NH3-N
Date
mg/L
12/12/2018
0.16
12/17/2018
0.46
12/18/2018
0.80
12/19/2018
1.15
12/26/2018
0.69
12/27/2018
1.03
12/28/2018
0.23
12/31/2018
0.18
1/2/2019
0.19
1/3/2019
0.24
1/7/2019
0.68
1/8/2019
0.09
1/9/2019
0.12
1/14/2019
0.49
1/15/2019
0.10
1/16/2019
0.23
1/22/2019
0.07
1/23/2019
0.35
1/24/2019
0.08
1/28/2019
0.07
1/29/2019
0.04
1/30/2019
0.13
2/4/2019
0.11
2/5/2019
0.10
2/6/2019
0.18
2/11/2019
0.12
2/12/2019
0.11
2/13/2019
0.13
2/19/2019
1.37
2/20/2019
1.34
2/21/2019
1.54
2/25/2019
0.07
2/26/2019
0.10
2/27/2019
0.28
3/4/2019
2.62
3/5/2019
0.05
3/6/2019
<0.04
3/11/2019
0.06
3/12/2019
0.08
3/13/2019
0.12
3/18/2019
2.29
3/19/2019
0.30
SUMMER MONTHS
Date
Effluent NH3-N
mg/L
8/10/2018
0.31
8/11/2018
0.17
8/12/2018
0.24
8/13/2018
0.49
8/14/2018
0.87
8/15/2018
0.92
8/20/2018
0.25
8/21/2018
0.26
8/22/2018
0.17
8/27/2018
0.74
8/28/2018
1.04
8/29/2018
1.07
9/5/2018
3.98
9/6/2018
0.63
9/7/2018
0.15
9/8/2018
0.14
9/9/2018
0.10
9/10/2018
0.09
9/11/2018
0.07
9/12/2018
0.37
9/19/2018
3.64
9/20/2018
0.31
9/21/2018
0.63
9/24/2018
1.08
9/25/2018
1.16
9/26/2018
0.44
10/3/2018
7.68
10/4/2018
6.46
10/5/2018
11.84
10/10/2018
12.56
10/11/2018
15.12
10/12/2018
15.52
10/17/2018
2.56
10/18/2018
1.19
10/19/2018
1.63
10/24/2018
10.40
10/25/2018
9.04
10/26/2018
6.09
10/30/2018
0.21
10/31/2018
0.19
4/1/2019
0.16
4/2/2019
0.38

Effluent NH3-N
Date
mg/L
3/20/2019
0.14
3/25/2019
0.19
3/26/2019
0.11
3/27/2019
0.07
11/4/2019
0.12
11/5/2019
0.26
11/6/2019
0.20
11/11/2019
0.14
11/12/2019
0.13
11/13/2019
0.33
11/18/2019
0.19
11/19/2019
0.13
11/20/2019
0.18
11/25/2019
0.22
11/26/2019
0.10
11/27/2019
0.15
12/2/2019
0.29
12/3/2019
0.14
12/4/2019
0.12
12/9/2019
0.15
12/10/2019
0.18
12/11/2019
0.13
12/16/2019
0.14
12/17/2019
0.18
12/18/2019
0.21
12/23/2019
0.11
12/26/2019
0.10
12/27/2019
0.17
12/30/2019
0.10
12/31/2019
0.15
1/2/2020
0.23
1/6/2020
0.09
1/7/2020
0.10
1/8/2020
0.18
1/13/2020
0.22
1/14/2020
0.27
1/15/2020
0.81
1/21/2020
0.14
1/22/2020
0.13
1/23/2020
0.34
1/27/2020
0.48
1/28/2020
1.07
moms
Date
Effluent NH3-N
mg/L
4/3/2019
0.35
4/8/2019
0.13
4/9/2019
0.09
4/10/2019
0.29
4/15/2019
0.08
4/16/2019
0.17
4/17/2019
0.24
4/22/2019
0.20
4/23/2019
0.16
4/24/2019
0.22
4/29/2019
0.41
4/30/2019
0.34
5/1/2019
1.39
5/6/2019
1.00
5/7/2019
1.45
5/8/2019
1.00
5/9/2019
0.70
5/10/2019
0.34
5/13/2019
0.98
5/14/2019
0.82
5/15/2019
0.38
5/17/2019
0.19
5/18/2019
0.17
5/20/2019
0.25
5/21/2019
0.20
5/22/2019
0.39
5/28/2019
0.63
5/29/2019
5/30/2019
0.87
0.26
6/3/2019
0.91
6/4/2019
0.25
6/5/2019
0.13
6/10/2019
0.14
6/11/2019
0.16
6/12/2019
0.15
6/17/2019
0.15
6/18/2019
0.30
6/19/2019
0.52
6/24/2019
0.50
6/25/2019
0.66
6/26/2019
0.67
6/27/2019
0.38

WINTER MONTHS
Effluent NH3-N
Date
mg/L
1/29/2020
0.24
2/3/2020
0.09
2/4/2020
0.12
2/5/2020
0.16
2/10/2020
0.15
2/11/2020
0.08
2/12/2020
0.04i
2/18/2020
0.11
2/19/2020
<0.04
2/20/2020
0.08
2/24/2020
0.06
2/25/2020
<0.04
2/26/2020
0.09
2/28/2020
3/2/2020
0.05
3/3/2020
0.06
3/4/2020
0.07
3/9/2020
0.09
3/10/2020
0.10
3/11/2020
0.05
3/16/2020
1.13
3/17/2020
0.85
3/18/2020
0.52
3/23/2020
0.21
3/24/2020
0.05
3/25/2020
0.14
3/30/2020
0.77
3/31/2020
0.57
Date
Effluent NH3-N
mg/L
6/28/2019
0.30
6/29/2019
0.46
7/1/2019
0.23
7/2/2019
0.25
7/3/2019
0.21
7/8/2019
0.26
7/9/2019
0.22
7/10/2019
0.77
7/15/2019
2.08
7/16/2019
2.33
7/17/2019
1.40
7/22/2019
1.76
7/23/2019
1.40
7/24/2019
0.79
7/25/2019
0.25
7/26/2019
0.14
7/27/2019
0.16
7/29/2019
0.16
7/30/2019
0.47
7/31/2019
0.24
8/5/2019
0.29
8/6/2019
0.68
8/7/2019
0.76
8/12/2019
0.16
8/13/2019
0.39
8/14/2019
0.24
8/19/2019
0.57
8/20/2019
0.54
8/21/2019
0.72
8/26/2019
1.08
8/27/2019
0.35
8/28/2019
0.25
9/3/2019
1.37
9/4/2019
0.40
9/5/2019
1.16
9/9/2019
0.07
9/10/2019
0.10
9/11/2019
0.27
9/16/2019
0.65
9/17/2019
0.33
9/18/2019
0.45
9/23/2019
4.71

Date
Effluent NH3-N
mg/L
MER ILITONMS
Date
Effluent NH3-N
mg/L
9/24/2019
1.19
9/25/2019
1.07
9/28/2019
0.66
9/30/2019
0.29
10/1/2019
0.47
10/2/2019
0.44
10/7/2019
1.15
10/8/2019
0.49
10/9/2019
0.10
10/14/2019
0.23
10/15/2019
0.06
10/16/2019
0.09
10/21/2019
0.95
10/22/2019
0.12
10/23/2019
0.18
10/28/2019
0.61
10/29/2019
0.35
10/30/2019
0.31
4/1/2020
0.37
4/6/2020
0.14
4/7/2020
0.06
4/8/2020
0.38
4/13/2020
0.10
4/14/2020
0.08
4/15/2020
0.06
4/20/2020
0.06
4/21/2020
0.05
4/22/2020
0.05
4/27/2020
0.09
4/28/2020
0.40
4/30/2020
0.10
5/1/2020
0.43
5/2/2020
0.10
5/4/2020
0.08
5/5/2020
0.15
5/6/2020
0.34
5/11/2020
0.18
5/12/2020
0.15
5/13/2020
0.08
5/18/2020
0.15
5/19/2020
0.09
5/20/2020
0.05

Date
Effluent NH3-N
mg/L
MONTHS
Effluent NH3-N
Date
mg/L
5/26/2020
0.05
5/27/2020
0.06
5/28/2020
0.10
6/1/2020
0.05
6/2/2020
0.11
6/3/2020
0.07
6/8/2020
0.12
6/9/2020
0.24
6/10/2020
0.06
6/15/2020
0.09
6/16/2020
0.06
6/17/2020
0.04
6/22/2020
<0.04
6/23/2020
0.11
6/24/2020
0.09
6/29/2020
0.10
6/30/2020
0.30
7/1/2020
0.19
7/6/2020
0.05
7/7/2020
0.48
7/8/2020
0.13
7/13/2020
0.14
7/14/2020
0.21
7/15/2020
0.20
7/20/2020
0.06
7/21/2020
1.35
7/22/2020
0.92
7/27/2020
0.07
7/28/2020
0.07
7/29/2020
0.14
8/3/2020
0.11
8/4/2020
0.08
8/5/2020
0.14
8/10/2020
0.08
8/11/2020
0.43
8/12/2020
0.62
8/17/2020
1.18
8/18/2020
1.15
8/19/2020
1.23
8/24/2020
0.94
8/25/2020
0.27
8/26/2020
0.70

WANTER CIS
Date
Effluent NH3-N
mg/L
Average
0.27
NPDES Monthly
Avg Limit
(Winter)
6
50% of Monthly
Average Limit
3
200% of Weekly
Avg
36
# samples >
200% of Weekly
Avg
0
SUMMER MONTHS
Date
Effluent NH3-N
mg/L
Average
0.76
NPDES Monthly
Avg Limit (Summer)
3
50% of Monthly
Average Limit
1.5
200% of Weekly
Avg
18
# samples > 200%
of Weekly Avg
0

AFFP
Public Notice North Carolina E
Affidavit of Publication
STATE OF NORTH
CAROLINA }
COUNTY OF HALIFAX }
SS
Tia Bedwell, being duly sworn, says:
That she is Editor of the The Daily Herald, a Daily
newspaper of general circulation, printed and published in
Roanoke Rapids, Halifax County, North Carolina; that the
publication, a copy of which 13 attached hereto, was
published in the said newspaper on the following dates:
November 13, 2020
Publisher's Fee: $ 84.30
That said newspaper was regularly issu !.c rcu�
i
\\0114411111 I l 11lp111/4
Public Notice
North Carolina Environmental Management Commission/
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a NPDES Wastewater Permit NC0025402 Town of Enfield
WWTP
The North Carolina Environmental Management Commission proposes to issue a
NPDES wastewater discharge permit to the person(s) listed below. Written
comments regarding the proposed permit will be accepted until 30 days after the
publish date of this notice. The Director of the NC Division of Water Resources
(DWR) may hold a public hearing should there be a significant degree of public
interest. Please mail comments and/or information requests to DWR at the above
address. Interested persons may visit the DWR at 512 N. Salisbury Street, Raleigh,
NC 27604 to review information on file. Additional information on NPDES permits
and this notice may be found on our website: http:f/deq.nc.gov/about/divisions/water-
resou rces/ovate r-resources-perm its/wastewater-branch/n pdes-wastewater/publ ic-
notices,or by calling [phone]. The Town of Enfield [P.O. Box 699, Enfield, NC
27823] has requested renewal of NPDES permit NC0025402 for its Enfield
Wastewater Treatment Plant, located in Halifax County. This permitted facility
discharges treated municipal wastewater to Fishing Creek, a class C-NSW water in
the Tar -Pamlico River Basin. Currently, BOD, ammonia, fecal coliform, pH, dissolved
oxygen, total nitrogen loading and total phosphorous loading are water quality
limited. This discharge may affect future allocations in this segment of Fishing
on those dates. co...' ?� ,Creek.
SIGNED: = v• NOTARY •Z
r1ov. 13, 2020
KvA,.ak), Q PUBLIC
Subscribed to and sworn to me this 13th d A1tlimo, A`\
2020.
My Commission Expires April 29, 2023
40087517 40383624
Wren Thedford
NCDEO-DWR
1617 Mail Service Center
Raleigh , NC 27699

Attachment A —Request for Missing Information
Table 2. EPA Application Form 2A Missing Information
40 CFR 122.2111)(1)
1.1
Email address of facility contact [e-mail]
0.,na p-i-qa« r©,...Q-4,, (1144.c_ . c.-�
1.2
Applicant email address [e-mail] j
1.3
Email address of the organization transporting the discharge for treatment prior to discharge NA
1.4
Email address of the organization receiving the discharge for treatment prior to discharge NA
1.5
Do you intend to request or renew one or more of the variances authorized
with your NPDES permitting authority to determine what information needs
Discharges into marine waters (CWA Section
III301(h))
X Not applicable
IIIWater
at 40 CFR 122.21(n)? (Check all that apply. Consult
to be submitted and when.)
quality related effluent limitation (CWA
Section 302(b)(2))
1,6
Email address of contractor responsible for operational or maintenance aspects of the treatment works
40 CFR
an tonio. • orham .+suaz.com
122 210)(61
1.7
Indicate the number of Sills and NSCIUs that discharge to the POTW.
Number of SIUs
Number of CIUs
0
0
40 CFR
122.221a) and 1d1
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 (print or type first and last name) Montre' Freeman
/ ' c11+ram- F v-'c- in c'-f
Official title Town Administrator
Signature ,.xli ,,,_,-}
"(
Date signed
/C)—Z3 - 20

Flow Process and Sludge Handling
Plant Process
Influent wastewater enters the plants influent flume; the barscreen/grit removal system removes
large debris. The wastewater is transferred to the influent pump station, then is pumped to the
oxidation ditch where the activated sludge process takes place. Discharged from the oxidation
ditch to the clarifiers, settled water from clarifiers is then sent to the chlorine contact chamber for
disinfection and sulfur dioxide is used for dechlorination. Samples are collected and sent to a
commercial laboratory for analysis for permit requirements. Final effluent is discharged to
Fishing creek. The approximate length from the discharge point to the creek is 4 miles. The
influent samples are collected at the end of the headworks, before the influent wet well. The
effluent samples are collected at the final effluent discharge after de -chlorination. The following
table lists the parameters that are sampled.
Influent Effluent
Parameters
BOD
TSS
pH
Dissolved Oxygen
Temperature
Parameters
Flow
BOD
TSS
Ammonia
pH
Dissolved Oxygen
Fecal Coliform
Total Residual Chlorine
Temperature
TKN
NO2N + NO3N
TN
Toxicity
Pollutant Scan
TP

•
.4911,
41/4
Environmental Testing Solutions, Inc.
PO Box 7565
Asheville, NC 28802
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Date: May 23, 2014
Effluent Aquatic Toxicity Report Form - Chronic Fathead Minnow Multi -Concentration Test
Facility: Enfield WWTP
Laboratory Performing Test: Environmental Testing
Signature of Operator in Responsible Charge:
Signature of Laboratory Supervisor:
NPDES #: NC- 0025402
Mail Original To: North Carolina Department of Environment and Natural Resources
DWQ/ Environmental Sciences Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Control
Organisms
Vo Effluent
Replicate number
1 2 3
4
1.75%
% Effluent
Surviving number of larvae
Original number of larvae
Weight/original (mg/larvae)
10
10
0.729
10
10
0.806
10
10
0.598
10
10
0.610
Surviving number of larvae
10
10
10
10
Original number of larvae
10
10
10
10
Weight/original (mg/larvae)
0.798
0.750
0.805 _
0.863
r 3.5%
Effluent
1 7.0%1
% Effluent
% Effluent
Surviving number of larvae
10
10
10
10
Original number of larvae
10
10
10
10
Weight/original (mg/larvae) _
0.671
0.824
0.794
0.876
Surviving number of larvae
10
10
10
10
Original number of larvae
10
10
10
10
Weight/original (mg/larvae)
0.880
0.773
0.791
0.819
28%
Surviving number of larvae
10
10
10
10
Original number of larvae
10
10
10
10
Weight/original (mg/larvae)
1.013
0.849
1.149
1.092
Surviving number of larvae
10
9
10
9
Original numbcr of larvae
10
10
10
10
Weight/original (mg/larvae) _
1.058
0.889
0.983
0.940
Water Quality Data
Day 0
Initial Final _
Control
pH (SU):
DO (mg/L):
Temp. (°C):
High Concentration
pH (SU):
DO (mg/L):
Temp. (°C):
r
.75
8.0
8.0
24.8
7.58
8.1
24.8
Sample Information
Collection start date:
Grab:
Composite duration:
Alkalinity (mg/L CaCO3):
Hardness (mg/L CaCO3):
Conductivity (µmhos/cm):
Total residua] chlorine (mg/L):
Sample Temp. at Receipt (°C):
7.65
7.6
24.7
7.51
7.6
24.4
Day 1
Initial Final
7.77
7.8
24.7
7.69
7.8
24.9
Sample 1
05-04-14
- 24-h
15
26
164
< 0.10
1.0
Da 2
Initial I Final
7.36 7.74
7.4
24.5
7.39
7.4
24.3
8.0
24.7
7.53
8.2
25.0
Sample 2 Sample 3
05-06-14
24.5-h
14
28
176
<0.10
1.1
05-10-14
23.5-h
14
32
195
< 0.10
3.4
7.23
7.3
24.6
7.15
7.1
Pipe #: 001 County: Halifax
Samples: 140506.06. 140503.06, 140511.01
Start date: I End date:
Start time:
End time:
05-06-14
05-13-14
1125
1105
Survival (%)
Average wt (mg)
Average wt /
surviving (mg)
Survival (%)
Average wt (mg)
Survival (%)
Average wt (mg)
Survival (%)
Average wt (mg)
Survival (%)
Average wt (mg)
100.0
0.686
0.686
100.0
0.804
100.0
0.791
100.0
0.816
100.0
1.026
Survival (%) I 95.0
Average wt (mg)
Day 3
Initial i Final
7.69
7.9
24.8
7.59
8.0
7.48
7.5
24.8
- 7.28
7.5
24.7 25.0 24.6
Overall Analysis:
Result: PASS LOEC: >28% NOEC: 28% ChV:
0.968
Day 4
Initial Final
7.67
8.1
7.35
6.6
24.7 24.4
7.58
7.8
24.8
Analyses
Normal:
Hom. Var.
NOEC:
LOEC:
ChV:
Method:
7.28
6.9
24.6
Test Organisms
Outside supplier:
Hatch date:
Hatch time:
Da 5
Initial I Final
7.70
8.1
24.7
7.50
7.6
24.9
7.18
6.7
24.6
7.18
7.3
24.3
Aquatax.lne.
05-05-14
1600-1700
Day 6
Initial Final
7.71
8.0
24.7
7.65
- 8.1
24.9
Survival
Growth
Yes
Yes
Yes
Yes
28%
28%
>28%
>28%
>28%
>28%
Visual Insp.
Dunnett's
7.44
7.4
24.6
7.38
7.5
24.5
Survival
Growth
% Effluent
Critical
Calculated
Critical
Calculated
1.75%
2.410
-1.954
3.5%
2.410
-1.743
7.0%
2.410
-2.148
14%
2.410
-5.618
28%
2.410
-4.656
>28%
DWQ form AT-5 (8/03)

Instream DO Summary Enfield WWTP NC0025402
Date
Upstream
[mg/L]
Downstream
[mg/L]
Date
Upstream
[mg/L]
Downstream
[mg/L]
9/1/16
6.1
6.1
8/9/18
7
6
9/26/16
8
6.2
8/22/18
7
6.2
10/6/16
8
7.1
9/10/18
7.4
6.7
11/3/16
9.1
8.2
9/21/18
7.2
6.2
12/1/16
10.8
11
10/2/18
7.6
7
1/27/17
10.1
9.7
12/27/18
12.2
11.4
2/23/17
10.5
10.7
1/23/19
12.7
12.9
3/23/17
10.2
10.3
2/11/19
10.1
10.2
4/24/17
7.7
7
4/1/19
9.8
9.3
5/4/17
7.8
6.3
5/8/19
7.7
6.7
5/25/17
8.2
7.1
5/28/19
6.7
6.1
6/9/17
7.7
6.8
6/17/19
7.8
7
6/19/17
7.3
6.3
6/27/19
6.9
6.3
7/13/17
6.4
5.9
7/12/19
6.4
5.8
7/31/17
6.7
6.2
7/22/19
6.5
5.7
8/11/17
4
3.7
8/1/19
6.4
5.8
8/23/17
6.6
5.7
8/23/19
6.1
5.9
9/6/17
8
6.8
9/13/19
6.1
5.5
9/28/17
7.2
6
9/23/19
6.7
6.3
10/26/17
8.3
7.9
10/16/19
6.9
7
11/29/17
11.4
11
11/25/19
11.9
11.8
12/28/17
11.2
10.9
12/19/19
10.7
10.7
1/31/18
10.4
9.8
1/29/20
12.1
13.3
2/22/18
8.2
7.9
2/25/20
12.6
11.9
3/5/18
9.5
9.1
3/16/20
10
9.4
4/9/18
10.8
9.9
4/13/20
9.5
8.5
5/10/18
8.2
7.5
5/13/20
10
9.1
5/29/18
7.4
6.1
5/26/20
8.7
7.7
6/18/18
7
6.6
6/11/20
6.7
6.2
6/28/18
7.1
6.3
Average
8.4
7.8
7/16/18
6.9
5.4
Max
12.7
13.3
7/26/18
6.3
5.7
Min
4
3.7
p-value
> .05

Instream Temperature Summary Enfield WWTP NC0025402
Date
Upstream
[degC]
Downstream
[degC]
Date
Upstream
[degC]
Downstream
[degC]
9/1/16
27.7
27
8/22/18
26
26.9
9/26/16
22.7
22.5
9/10/18
26.8
26.3
10/6/16
20.2
20.4
9/21/18
24.7
24.7
11/3/16
15.3
15.5
10/2/18
22.5
22.4
12/1/16
10.9
11
12/27/18
5.6
6.2
1/27/17
10.1
10
1/23/19
3.9
4.7
2/23/17
12.1
12.5
2/11/19
9
9.8
3/23/17
12.4
11.3
4/1/19
13.4
13.3
4/24/17
19.3
18.6
5/8/19
21.7
22.3
5/4/17
21.5
21.6
5/28/19
26
26
5/25/17
19.8
21.2
6/17/19
23.5
23.7
6/9/17
21.2
21.5
6/27/19
26.1
25.9
6/19/17
24.1
24.3
7/12/19
27.9
27.6
7/13/17
28.8
29.2
7/22/19
30.7
29.8
7/31/17
25.6
25.1
8/1/19
27.3
26.7
8/11/17
26.9
25.6
8/23/19
28
27.6
8/23/17
27
27.1
9/13/19
26.3
26.1
9/6/17
23.1
23.8
9/23/19
22.7
21.9
9/28/17
24.2
23.9
10/16/19
18.8
18
10/26/17
16.5
15.7
11/25/19
9.3
8.4
11/29/17
7.2
7.8
12/19/19
8.1
7.8
12/28/17
5.3
4.8
1/29/20
7.2
7.2
1/31/18
6.5
7.1
2/25/20
7.4
7.5
2/22/18
13.5
13.8
3/16/20
14
14.2
3/5/18
10
10.1
4/13/20
16.2
17.4
4/9/18
11.8
12.1
5/13/20
14.9
15.3
5/10/18
19.1
19.3
5/26/20
20.6
20.3
5/29/18
23
23.5
6/11/20
25.5
25.7
6/18/18
25.8
26.2
Average
19.2
19.2
6/28/18
26.2
26.8
Max
30.7
29.8
7/16/18
27.2
26.6
Min
3.9
4.7
7/26/18
26.5
25.3
p-value
> .05
8/9/18
26.6
27

NH3/TRC WLA Calculations
Facility: Enfield WWTP
PermitNo. NC0025402
Prepared By: Nick Coco
Enter Design Flow (MGD):
Enter s7Q10 (cfs):
Enter w7Q10 (cfs):
1
20
53.5
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/I)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/I)
I WC (%)
Allowable Conc. (ug/I)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
20
1
1.55
17.0
0
7.19
236
Cap at 28 ug/L.
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS) 20
DESIGN FLOW (MGD) 1
DESIGN FLOW (CFS) 1.55
STREAM STD (MG/L) 1.0
Upstream Bkgd (mg/I) 0.22
I WC (%) 7.19
Allowable Conc. (mg/I) 11.1
Less stringent than existing limit. Maintain limit.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/I)
w7Q10 (CFS) 53.5
200/100m1 DESIGN FLOW (MGD) 1
DESIGN FLOW (CFS) 1.55
STREAM STD (MG/L) 1.8
13.90 Upstream Bkgd (mg/I) 0.22
I WC (%) 2.82
Allowable Conc. (mg/I) 56.3
Less stringent than existing limit. Maintain limit.
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Same as current permit limit. Maintain limit.
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)

10/21/20 WQS= 12 ng/L
Facility Name Enfield WWTP/NC0020834
/Permit No. :
MERCURYWQBEL/TBEL EVALUATION V:2013-6
Total Mercury 1631E PQL=0.5 ng/L 7010s=
Date Modifier Data Entry Value Permitted Flow =
5/15/18 4.9
No Limit Required
No MMP Required
20.000
1.000
cfs
WQBEL = 166.84 ng/L
47 ng/L
4.9 4.9 ng/L -Annual Averagefor 2018

Enfield WWTP/NC0020834
Mercury Data Statistics (Method 1631E)
2018
# of Samples
1
Annual Average, ng/L
4.9
Maximum Value, ng/L
4.90
TBEL, ng/L
47
WQBEL, ng/L
166.8

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Ouffall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
CHECK IFHQW ORORW WQS
Enfield WWTP
IV
NC0025402 _
001
1.000
Fishing Creek
03020102
C;NSW
Apply WS Hardness WQC
7Q10s (cfs)
7Q1Ow (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
20.000
53.50
20.00
526.00
.
16.51
Effluent Hardness
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
41.74 mg/L (Avg)
25 mg/L (Avg)
26.2 mg/L
26.44 mg/L
Data Source(s)
CHECK TO APPLY MODEL
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Name
WQS
Type
Chronic
Modifier
Acute
PQL Units
Arsenic
AquacticLife
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
0.6112
FW
3.4016
ug/L
Chlorides 1
Aquatic Life
NC
230
FW
mg/L
Chlorinated Phenolic Compounds
water supply
NC
1
A
ug/L
♦ Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
122.3560
FW
947.4595
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
8.2038
FW
11.0380
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
3.1016
FW
80.3871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
38.7426
FW
351.4336
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.3263
ug/L
Zinc
Aquatic Life
NC
131.8859
FW
131 .7992
ug/L
25402 RPA.xlsm, input
10/21/20

REASONABLE POTENTIAL ANALYSIS
H1
Effluent Hardness
Date Data BDL=1/2DL Results
1 2/1/17 36 36 Std Dev.
2 3/8/17 44 44 Mean
3 4/5/17 36 36 C.V.
4 5/3/17 36 36 n
5 6/7/17 44 44 10th Per value
6 8/9/17 40 40 Average Value
7 9/7/17 32 32 Max. Value
8 10/4/17 44 44
9 11/8/17 40 40
10 12/6/17 16 16
11 1/4/18 48 48
12 2/7/18 40 40
13 3/7/18 36 36
14 4/4/18 40 40
15 5/2/18 40 40
16 6/6/18 40 40
17 7/5/18 60 60
18 8/8/18 84 84
19 9/7/18 44 44
20 10/5/18 32 32
21 11/7/18 88 88
22 12/5/18 41 41
23 1/3/19 39 39
24 2/6/19 32 32
25 3/6/19 29 29
26 4/3/19 43 43
27 5/8/19 48 48
28 6/5/19 51 51
29 7/3/19 55 55
30 8/7/19 31 31
31 9/5/19 11 11
32 10/2/19 53 53
33 11/6/19 45 45
34 12/4/19 39 39
35 1/8/20 40 40
36 2/5/20 40 40
37 3/4/20 36 36
38 4/8/20 32 32
39 5/6/20 40 40
40 6/3/20 38 38
41 7/8/20 44 44
42 8/5/20 46 46
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values
then "COPY" .
Maximum data
points= 58
H2
Upstream Hardness
13.3143
41.7381
0.3190
42
32.00 mg/L
41.74 mg/L
88.00 mg/L
Date Data BDL=1/2DL Results
25 Std Dev.
Mean
C.V.
n
10th Per value
Average Value
Max. Value
Default 25
Use"PASTE
SPECIAL -Values'
then "COPY" .
Maximum data points
= 58
N/A
25.0000
0.0000
1
25.00 mg/L
25.00 mg/L
25.00 mg/L
25402 RPA.xlsm, data
- 1 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Arsenic
Date Data BDL=1/2DL Results
1 1/26/16 < 5 2.5 Std Dev.
2 1/24/17 < 5 2.5 Mean
3 5/14/18 < 5 2.5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points=
58
0.0000
2.5000
0.6000
3
3.00
2.5 ug/L
7.5 ug/L
25402 RPA.xlsm, data
- 2 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par03
Beryllium
Use"PASTE
SPECIAL -Values
then "COPY" .
Maximum data
points = 58
Date Data BDL=1/2DL Results
1 1/26/16 < 1 0.5 Std Dev. 0.0000
2 1/24/17 < 1 0.5 Mean 0.5000
3 5/14/18 < 1 0.5 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor = 3.00
7 Max. Value 0.50 ug/L
8 Max. Pred Cw 1.50 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
Par04
Cadmium
Date Data BDL=1/2DL Results
1 1/26/16 < 1 0.5 Std Dev.
2 1/24/17 < 1 0.5 Mean
3 5/14/18 < 1 0.5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE SPECIAL -
Values" then "COPY" .
Maximum data points
= 58
0.0000
0.5000
0.6000
3
3.00
0.500 ug/L
1.500 ug/L
25402 RPA.xlsm, data
- 3 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par07
Total Phenolic Compounds
Date Data BDL=1/2DL Results
1 1/26/16 5 2.5 Std Dev.
2 1/24/17 5 2.5 Mean
3 5/14/18 5 2.5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values
then "COPY" .
Maximum data
points 58
Par10
Chromium, Total
0.0000
2.5000
0.6000
3
3.00
2.5 ug/L
7.5 ug/L
Date Data BDL=1/2DL Results
1 1/26/16 < 5 2.5 Std Dev.
2 1/24/17 < 5 2.5 Mean
3 5/14/18 < 5 2.5 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values"
then "COPY" .
Maximum data
points = 58
0.0000
2.5000
0.6000
3
3.00
2.5 pg/L
7.5 pg/L
25402 RPA.xlsm, data
- 4 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Pal
Copper
Date Data
1/26/16 <
1/24/17 <
5/14/18 <
BDL=1/2DL Results
10 5 Std Dev.
10 5 Mean
10 5 C.V. (default)
n
Use"PASTE
SPECIAL -Values
then "COPY" .
Maximum data
points 58
Par12
Cyanide
0.0000
5.0000
0.6000
3
Mult Factor = 3.00
Max. Value 5.00 ug/L
Max. Pred Cw 15.00 ug/L
Date Data
1/26/16
1/24/17
5/14/18
< 5
< 5
< 5
BDL=1/2DL Results
5 Std Dev.
5 Mean
5 C.V. (default)
n
Mult Factor =
Max. Value
Max. Pred Cw
Use"PASTE
SPECIAL -Values"
then "COPY" .
Maximum data
points = 58
0.0000
5.00
0.6000
3
3.00
5.0 ug/L
15.0 ug/L
25402 RPA.xlsm, data
- 5 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par14
Lead
Date Data BDL=1/2DL Results
1 1/26/16 < 5 2.5 Std Dev.
2 1/24/17 < 5 2.5 Mean
3 5/14/18 < 5 2.5 C.V. (default)
4 n
5
6 Mult Factor=
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values"
then "COPY" .
Maximum data
points = 58
0.0000
2.5000
0.6000
3
3.00
2.500 ug/L
7.500 ug/L
Par17 & Par18
Nickel
Date Data BDL=1/2DL Results
1 1/26/16 < 10 5 Std Dev.
2 1/24/17 < 10 5 Mean
3 5/14/18 < 10 5 C.V. (default)
4 n
5
6 Mu It Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values"
then "COPY" .
Maximum data
points 58
0.0000
5.0000
0.6000
3
3.00
5.0 pg/L
15.0 pg/L
25402 RPA.xlsm, data
- 6 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par19
Selenium
Date Data BDL=1/2DL Results
1 1/26/16 < 10 5 Std Dev.
2 1/24/17 < 10 5 Mean
3 5/14/18 < 10 5 C.V. (default)
4 n
5
6 Mult Factor=
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values
then "COPY" .
Maximum data
points 58
0.0000
5.0000
0.6000
3
3.00
5.0 ug/L
15.0 ug/L
Par20
Silver
Date Data BDL=1/2DL Results
1 1/26/16 < 5 2.5 Std Dev.
2 1/24/17 < 5 2.5 Mean
3 5/14/18 < 5 2.5 C.V. (default)
4 n
5
6 Mult Factor=
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE
SPECIAL -Values"
then "COPY" .
Maximum data
points = 58
0.0000
2.5000
0.6000
3
3.00
2.500 ug/L
7.500 ug/L
25402 RPA.xlsm, data
- 7 - 10/21/20

REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date Data BDL=1/2DL Results
1 1/26/16 31 31 Std Dev.
2 1/24/17 19 19 Mean
3 5/14/18 14 14 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points=
58
8.7369
21.3333
0.6000
3
3.00
31.0 ug/L
93.0 ug/L
25402 RPA.xlsm, data
- 8 - 10/21/20

Enfield WWTP
NC0025402
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 1.0000
1Q10S (cfs)= 16.51
7Q1OS (cfs) = 20.00
7Q1OW (cfs) = 53.50
30Q2 (cfs) = 20.00
Avg. Stream Flow, QA (cfs) = 526.00
Receiving Stream: Fishing Creek HUC 03020102
WWTP/WTP Class: IV
IWC% @ 1Q10S = 8.582502769
IWC% @ 7Q1OS = 7.192575406
IWC% @ 7Q1OW = 2.815622162
IWC% @ 30Q2 = 7.192575406
IW%C @ QA = 0.293811013
Stream Class: C;NSW
Outfall 001
Qw = 1 MGD
COMBINED HARDNESS (mg/L)
Acute = 26.44 mg/L
Chronic = 26.2 mg/L
PARAMETER
TYPE
NC STANDARDS OR EPA CRITERIA
_1F
a
n
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
Applied
Chronic Standard Acute
n # Det. Max Pred Cw Allowable Cw
Arsenic
Arsenic
C
C
150 FW(7Q10s) 340
10 HH/WS(Qavg)
ug/L
ug/L
3 0
Note: n < 9
Limited data set
7.5
C.V. (default)
NO DETECTS
Acute (FW): 3,961.5
__ _ _ __ _ _ _------------------------------
Chronic (FW): 2,085.5
Max MDL = 5 _ _ _ _ _
Chronic (HH): 3,403.5
Max MDL= 5
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
3 0
Note: n < 9
Limited data set
1.50
C.V. (default)
NO DETECTS
Acute: 757.35
____ _ _______ _____
Chronic: 90.37
Max MDL= 1
_ _ _ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Cadmium
NC
0.6112 FW(7Q10s) 3.4016
ug/L
3 0
Note: n < 9
Limited data set
1.500
C.V. (default)
NO DETECTS
Acute: 39.634
_ _ _ _ _ _ _ _
Chronic:8.498
Max MDL= 1
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 0
Note: n < 9
Limited data set
7.5
C.V. (default)
NO DETECTS
Acute: NO WQS
____ _ _____ _ _ ___
Chronic: 4,171.0
Max MDL= 5
_ _ _ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Chromium III
NC
122.3560 FW(7Q10s) 947.4595
µg/L
0 0
N/A
Acute: 11,039.4
_ _ _ _
---Chronic----- 1,701.1 -------------------------------
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
Acute: 186.4
--_ _ _ _
-Chronic-------- --------------------------------
152
Chromium, Total
NC
µg/L
3 0
Note: n < 9
Limited data set
7.5
C.V. (default)
NO DETECTS
Max reported value = 2.5
Max MDL= 5
a: No monitoring required if all Total Chromium samples
are < 5 pg/L or Pred. max for Total Cr is < allowable Cw
for CrVI.
Copper
NC
8.2038 FW(7Q10s) 11.0380
ug/L
3 0
Note: n < 9
Limited data set
15.00
C.V. (default)
NO DETECTS
Acute: 128.61
____ _ _______ _____
Chronic: 114.06
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
3 0
Note: n < 9
Limited data set
15.0
C.V. (default)
NO DETECTS
Acute: 256.3
____ _ _______ _____
Chronic: 69.5
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Lead
NC
3.1016 FW(7Q10s) 80.3871
ug/L
3 0
Note: n <9
Limited data set
7.500
C.V. (default)
NO DETECTS
Acute: 936.640
____ _ _____ __________________________________
Chronic: 43.122
Max MDL= 5
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Page 1 of 2
25402 RPA.xlsm, rpa
10/21/20

Enfield WWTP
Outfall 001
NC0025402 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 1 MGD
Acute (FW): 4,094.8
Nickel
NC
38.7426 FW(7Q10s) 351.4336
µg/L
— —
3 0
Note: n < 9
15.0
C.V. (default)
Chronic (FW): 538.6
Max MDL =10 _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Limited data set
NO DETECTS
Chronic (WS): 347.6
No RP, Predicted Max < 50% of Allowable Cw - No
Max MDL = 10
Monitoring required
Acute: 652.5
Selenium
NC
5 FW(7Q10s) 56
ug/L
3 0
15.0
_ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Note: n <9
C.V. (default)
Chronic_ 69.5
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
NO DETECTS
Max MDL = 10
Monitoring required
Acute: 3.802
Silver
NC
0.06 FW(7Q10s) 0.3263
ug/L
3 0
7.500
Note: n < 9
C.V. (default)
Chronic: 0.834
All values reported non -detect < 5 ug/L - No monitoring
required. Permittee shall report to PQL of 1 ug/L.
Limited data set
NO DETECTS
Max MDL= 5
Acute: 1,535.7
No RP, Predicted Max < 50% of Allowable Cw - No
Zinc
NC
131.8859 FW(7Q10s) 131.7992
ug/L
3 3
93.0
Monitoring required
Note: n <9
C.V. (default)
Chronic: 1,833.6
Limited data set
No value> Allowable Cw
25402 RPA.xlsm, rpa
Page 2 of 2 10/21/20

Permit No. NC0025402
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
2B.0200 (e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151 [ln hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151[ln hardness]-3.6236}
Cadmium, Chronic
WER* { 1.101672-[ln hardness](0.041838)} • e^{0.7998[In hardness1-4.4451 }
Chromium III, Acute
WER*0.316 • e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 • e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 • e^{0.9422[ln hardness]-1.700}
Copper, Chronic
WER*0.960 • e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-1.460}
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-4.705}
Nickel, Acute
WER*0.998 • e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 • e^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No. NC0025402
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 • e^{0.8473[ln hardness]+0.884}
Zinc, Chronic
WER*0.986 • e^{0.8473[hi hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved and hardness -dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness
and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on default translator values developed for each metal (more on that
below), but it is also possible to consider case -specific translators developed in accordance with
established methodology.
RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 1Q10 using the formula 1Q10 = 0.843 (s7Q10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and
upstream hardness samples over a period of one week. The RPA is rerun using the new data.
Page 2 of 4

Permit No. NC0025402
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1Q10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator: Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the
equation:
Cdiss = 1
Ctotal 1 + { /KPA] [SS(t+a)] /10 6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q10 + Qw) (Cwqs) — (s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q10)
s7Q10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q10 may be incorporated as applicable:
1Q10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0025402
QA = used in the equation to protect human health through the consumption of water,
fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
41.74
Data provided in DMRs
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
25
Default value used
7Q10 summer (cfs)
20.0
NPDES Files
1Q10 (cfs)
16.51
Calculated in RPA
Permitted Flow (MGD)
1.0
NPDES Files
Date: 11/3/2020
Permit Writer: Nick Coco
Page 4 of 4

NC0025402 Enfield WWTP 10/21/20
BOD monthly removal rate
Month RR(%) Month RR(%)
September-16
October-16
November-16
December-16
January-17
February-17
March-17
April-17
May-17
June-17
July-17
August-17
September-17
October-17
November-17
December-17
January-18
February-18
March-18
April-18
May-18
June-18
July-18
August-18
September-18
October-18
November-18
December-18
January-19
February-19
97.25
93.67
97.99
97.72
95.15
97.48
95.87
93.61
95.68
92.42
95.08
97.00
94.69
98.04
97.77
97.22
95.68
95.53
92.27
92.83
85.75
95.55
97.05
95.69
94.34
89.53
95.21
85.01
88.38
83.17
March-19
April-19
May-19
June-19
July-19
August-19
September-19
October-19
November-19
December-19
January-20
February-20
March-20
April-20
May-20
June-20
July-20
August-20
September-20
October-20
November-20
December-20
January-21
February-21
March-21
April-21
May-21
June-21
July-21
August-21
Overall BOD removal rate
90.89
96.10
96.39
97.25
96.80
95.95
97.94
98.04
95.74
95.45
85.44
89.78
95.02
96.06
97.26
97.57
96.03
98.77
94.57
TSS monthly removal rate
Month RR (%) Month RR (%)
September-16
October-16
November-16
December-16
January-17
February-17
March-17
April-17
May-17
June-17
July-17
August-17
September-17
October-17
November-17
December-17
January-18
February-18
March-18
April-18
May-18
June-18
July-18
August-18
September-18
October-18
November-18
December-18
January-19
February-19
95.42
90.84
97.27
95.73
93.45
92.95
90.37
91.73
94.12
89.72
94.46
96.18
91.42
96.01
95.62
90.88
90.32
89.06
90.73
91.89
88.27
94.39
96.78
95.75
94.87
91.74
93.42
80.83
81.86
80.71
March-19
April-19
May-19
June-19
July-19
August-19
September-19
October-19
November-19
December-19
January-20
February-20
March-20
April-20
May-20
June-20
July-20
August-20
September-20
October-20
November-20
December-20
January-21
February-21
March-21
April-21
May-21
June-21
July-21
August-21
Overall TSS removal rate
90.22
93.68
96.33
96.48
96.94
94.94
97.45
98.42
94.83
90.50
83.64
81.14
91.86
90.99
96.55
97.68
96.83
99.12
92.59

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 10/07/2C Page 1 of 1
Permit: NC0025402 MRs Betweel 9 - 2016 and 9 - 2020
Facility Name: % Param Name%
Major Minor: %
Region: % Violation Category:Limit Violation Program Category: %
County: % Subbasin:% Violation Action: %
PERMIT: NC0025402
FACILITY: Town of Enfield - Enfield WWTP
COUNTY: Halifax REGION: Raleigh
Limit Violation
MONITORING UNIT OF
OUTFALL LOCATION PARAMETER VIOLATION FREQUENCY
REPORT DATE MEASURE
LIMIT
CALCULATED
VALUE Over
VIOLATION TYPE VIOLATION ACTION
02-2019 001 Effluent Coliform, Fecal MF, MFC 02/23/19 3 X week #/100m1 400 407.42 1.9 Weekly Geometric Mean Proceed to NOD
Broth, 44.5 C Exceeded
10-2018 001 Effluent Nitrogen, Ammonia Total (as 10/13/18 3 X week mg/1 9 14.4 60 Weekly Average Proceed to NOV
N) - Concentration Exceeded
10-2018 001 Effluent Nitrogen, Ammonia Total (as 10/31/18 3 X week mg/1 3 7.18 139.3 Monthly Average Proceed to NOV
N) - Concentration Exceeded

United States Environmental Protection Agency
E PA Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection
1 IN 2 I5 �-I 3 I NC0025402 111 121 19/12/20 117
Type
18 [
l l I l l
Inspector Fac Type
19 G I 201
2111111 1i i l l lil i i i I I i i i l l l i i l h i
iii
i i i i i 166
Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA Reserved
671I 7° I I 711I 72 I N I 73I I 174
L� 1 751
I I I I I I 180
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Enfield WWTP
18270 US Hwy 301
Enfield NC 27823
Entry Time/Date
09:45AM 19/12/20
Permit Effective Date
16/02/01
Exit Time/Date
12:OOPM 19/12/20
Permit Expiration Date
19/10/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Antonio Miguel Gorham/ORC/252-445-2385/
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Bobby E Davis,PO Box 699 Enfield NC 27823//252-445-3146/2524451019
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran Sludge Handling Dispos Facility Site Review Effluent/Receiving Wate
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
Joshua S Brigham DWR/RRO WQ/919-791-4200/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page# 1

31
NPDES yr/mo/day
NC0025402 111 121 19/12/20
117
Inspection Type
18 [j
(Cont.)
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Findings during the pre -inspection file review were as follows:
1. Through NPDES permit NC0025402, the Town is authorized to discharge treated wastewater from
Enfield WWTP to receiving waters designated as Fishing Creek, classified C;NSW waters in the
Tar -Pamlico River Basin. The NPDES permit was issued effective February 1, 2016, and expired
October 31, 2019. Permit renewal documents were received for review on April, 26th, 2019.
2. Enfield WWTP, classified WW-3, provides treatment and discharge through the outfall pipe to
Fishing Creek. As listed in the subject permit, the treatment components include, a bar screen
(mechanical), grit removal system, oxidation ditch with anoxic zone, two secondary clarifiers, a
chlorine (gas) disinfection system with one chlorine contact chamber, gas dechlorination system, two
aerobic digesters, and one 338,0000 gallon capacity sludge holding tank. Additionally, the facility
includes influent and effluent pump stations, influent and effluent composite samplers, and an
emergency generator.
3. Beginning December 21, 2016, EPA's NPDES Electronic Reporting Rule requires permittees to
submit their discharge monitoring reports (DM Rs) electronically, instead of on paper. The first DMR
the Division received electronically from the City was for June 2015. To learn more about the eDMR
system, please visit the Division's eDMR website at
https://deq.nc.gov/about/divisions/water-resources/edmr.
4. For the review period February 2018 — November 2019, one frequency violation was noted for the
month of September 2019 for failure to report monthly Total Flow. Three penalty assessments have
been issued since October 2018, and the last Notice of Violation was issued in October 2018 for
exceeding monthly average for Total Ammonia at the effluent. Since the previous inspection, Enfield
WWTP has been compliant with its Whole Effluent Toxicity limit and monitoring requirements.
Findings during the inspection were as follows:
5. The operator's log and supporting analytical documentation were consistent and up to date.
6. The inspector compared the August, September, and November 2019 DMR data against lab bench
data and Environment 1's analytical results. No discrepancies were noted. The facility was missing
data for the September 2019 DMR for Total Flow (monthly). The ORC stated he will amend the
September 2019 eDMR with the corrected Total Flow value and submit it to the Division.
7. The inspector noted the following observations of the treatment components:
a) Primary Treatment. The mechanical bar screen was not in operation at the time of inspection and
was being manually cleared. The grit removal chambers were in operation and did not appear to have
any issues that would affect proper operation. The screenings collected after the influent flow passes
through these processes are retained in a dumpster before being hauled to the landfill. The area
around these units was clean and well maintained.
b) Secondary Treatment. Algae was noted in the oxidation ditch. One clarifier unit was in use at the
time of inspection. The weirs appeared level, and little to no pin floc was observed within the units. A
large amount of algae was observed floating within the clarifier. The sludge depth in the clarifier was
observed at 1'/4 feet. The volume depth in each of these units is approximately 14 feet.
c) Disinfection. The facility disinfects the treated wastewater prior to discharge using a gas chlorine
feed followed by a gas dechlorination feed. One empty chlorine gas tank was unsecured during the
time of inspection.
d) Sludge Treatment. The sludge hauler, Granville Farms, is contracted annually to haul the solids
away. It was noted that the first aerobic digester has a non-functional aerator, and that the second
aerobic digester has a non-functional aerator and mixer.
8. Flow measurement at the treatment plant is performed at the effluent. The flow meter is calibrated
at least annually and was last calibrated on October 30, 2019 by Carolina Technical Services. The
facility also measures flow using a chart recorder. The flow measurement from the ultrasonic flow
Page# 2

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield VVVVTP
Inspection Type: Compliance Evaluation
meter located at the effluent station was 0.444 MGD. The permitted flow limit is 1.0 MGD. No issues o1
concern were observed with the flow measurement devices.
9. The effluent pump station has three pumps. One of the pumps was non-functional at the time of
inspection.
10. The inspector observed the effluent discharge to Fishing Creek via the outfall pipe to be clear with
no observable solids or foam. No detrimental impacts to Fishing Creek from the effluent discharge
were observed.
11. The ORC stated the backup generator is operated weekly. At least once a month, the operators
test the generator under load. The generator was started during the inspection and appeared to be
running properly.
Page# 3

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield VVVVTP
Inspection Type: Compliance Evaluation
Operations & Maintenance
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment:
Permit
(If the present permit expires in 6 months or less). Has the permittee submitted a new
application?
Is the facility as described in the permit?
# Are there any special conditions for the permit?
Is access to the plant site restricted to the general public?
Is the inspector granted access to all areas for inspection?
Comment:
Record Keeping
Are records kept and maintained as required by the permit?
Is all required information readily available, complete and current?
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?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operatc
on each shift?
Is the ORC visitation log available and current?
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility classification'
Is a copy of the current NPDES permit available on site?
Yes No NA NE
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Yes No NA NE
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Yes No NA NE
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Page# 4

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield VVVVTP
Inspection Type: Compliance Evaluation
Record Keeping
Facility has copy of previous year's Annual Report on file for review?
Comment: Annual Performance report sent to town.
Effluent Pipe
Is right of way to the outfall properly maintained?
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:
Flow Measurement - Influent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Comment:
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Yes No NA NE
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Yes No NA NE
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Yes No NA NE
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Yes No NA NE
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Comment: Flow is measured at the effluent. The flow meter was last calibrated by Carolina Technical
Services on October 30, 2019.
Aerobic Digester
Is the capacity adequate?
Is the mixing adequate?
Is the site free of excessive foaming in the tank?
# Is the odor acceptable?
# Is tankage available for properly waste sludge?
Yes No NA NE
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Comment: There are two aerobic digesters on site. One digester has a non-functioning aerator and the
other digester has a non-functioning mixer and aerator.
Chemical Feed Yes No NA NE
Page# 5

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield VVVVTP
Inspection Type: Compliance Evaluation
Chemical Feed
Is containment adequate?
Is storage adequate?
Are backup pumps available?
Is the site free of excessive leaking?
Comment: Caustic is fed to the influent pump station for pH control.
Pump Station - Effluent
Is the pump wet well free of bypass lines or structures?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Is SCADAtelemetry available and operational?
Is audible and visual alarm available and operational?
Comment: There are three pumps and one is currently not functioning.
Pump Station - Influent
Is the pump wet well free of bypass lines or structures?
Is the wet well free of excessive grease?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Is SCADAtelemetry available and operational?
Is audible and visual alarm available and operational?
Comment: Operator has auto -dialer system.
Bar Screens
Type of bar screen
a.Manual
b.Mechanical
Are the bars adequately screening debris?
Is the screen free of excessive debris?
Is disposal of screening in compliance?
Is the unit in good condition?
Yes No NA NE
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Yes No NA NE
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Yes No NA NE
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Yes No NA NE
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Page# 6

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield VVVVTP
Inspection Type: Compliance Evaluation
Bar Screens Yes No NA NE
Comment: Mechanical bar screen was not functional at the time of inspection and was being manually
cleaned.
Grit Removal
Type of grit removal
a.Manual
b.Mechanical
Is the grit free of excessive organic matter?
Is the grit free of excessive odor?
# Is disposal of grit in compliance?
Comment:
Oxidation Ditches
Are the aerators operational?
Are the aerators free of excessive solids build up?
# Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin's surface?
Is the DO level acceptable?
Are settleometer results acceptable (> 30 minutes)?
Is the DO level acceptable?(1.0 to 3.0 mg/I)
Are settelometer results acceptable?(400 to 800 ml/I in 30 minutes)
Yes No NA NE
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Yes No NA NE
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Comment: DO was 3.31 mci/L in the aerobic zone and 0.70 mci/L in the anoxic zone. Algae was
observed.
Disinfection -Gas
Are cylinders secured adequately?
Are cylinders protected from direct sunlight?
Is there adequate reserve supply of disinfectant?
Is the level of chlorine residual acceptable?
Is the contact chamber free of growth, or sludge buildup?
Is there chlorine residual prior to de -chlorination?
Does the Stationary Source have more than 2500 Ibs of Chlorine (CAS No. 7782-50-5)?
If yes, then is there a Risk Management Plan on site?
If yes, then what is the EPA twelve digit ID Number? (1000- - )
Yes No NA NE
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Page# 7

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield WWTP
Inspection Type: Compliance Evaluation
Disinfection -Gas
If yes, then when was the RMP last updated?
Comment: One empty unsecured tank. 2 on line, 4 full on standby.
Yes No NA NE
De -chlorination Yes No NA NE
Type of system ? Gas
Is the feed ratio proportional to chlorine amount (1 to 1)? • ❑ ❑ ❑
Is storage appropriate for cylinders? • ❑ ❑ ❑
# Is de -chlorination substance stored away from chlorine containers? • ❑ ❑ ❑
Are the tablets the proper size and type? ❑ ❑ • ❑
Comment: One on line, three full on standby.
Are tablet de -chlorinators operational? ❑ ❑ • ❑
Number of tubes in use?
Comment:
Secondary Clarifier
Is the clarifier free of black and odorous wastewater?
Is the site free of excessive buildup of solids in center well of circular clarifier?
Are weirs level?
Is the site free of weir blockage?
Is the site free of evidence of short-circuiting?
Is scum removal adequate?
Is the site free of excessive floating sludge?
Is the drive unit operational?
Is the return rate acceptable (low turbulence)?
Is the overflow clear of excessive solids/pin floc?
Is the sludge blanket level acceptable? (Approximately 1/4 of the sidewall depth)
Yes No NA NE
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Comment: One Secondary Clarifier being used at a time. Sludge blanket at 1 and a 1/4 feet. Algae
noted in clarifier.
Influent Sampling
# Is composite sampling flow proportional?
Is sample collected above side streams?
Is proper volume collected?
Yes No NA NE
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Page# 8

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield WWTP
Inspection Type: Compliance Evaluation
Influent Sampling
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is sampling performed according to the permit?
Comment: Temperature 4 degrees C.
Effluent Sampling
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment: Temperature 3.2 degrees C.
Yes No NA NE
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Yes No NA NE
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Laboratory Yes No NA NE
Are field parameters performed by certified personnel or laboratory? • ❑ ❑ ❑
Are all other parameters(excluding field parameters) performed by a certified lab? • ❑ ❑ ❑
# Is the facility using a contract lab? • ❑ ❑ ❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees ❑ ❑ • ❑
Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? ❑ ❑ • ❑
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees? ❑ ❑ • ❑
Comment: Certified lab Environment 1 of Greenville, NC (Lab Cert. #10).
Standby Power
Is automatically activated standby power available?
Is the generator tested by interrupting primary power source?
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?
Is there an emergency agreement with a fuel vendor for extended run on back-up power?
Is the generator fuel level monitored?
Yes No NA NE
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Page# 9

Permit: NC0025402
Inspection Date: 12/20/2019
Owner - Facility: Enfield wwTP
Inspection Type: Compliance Evaluation
Standby Power Yes No NA NE
Comment: Generator operated weekly and tested under load every month.
Page# 10