NC0003450_Fact Sheet_20231002

Fact Sheet
NPDES Permit No. NC0003450
Permit Writer/Email Contact: Nick Coco, [e-mail]
Date: September 25, 2023
Division/Branch: NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
® Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
Town of Wallace/Wallace Regional Wastewater Treatment Plant (WWTP)
Applicant Address:
316 E. Murray Street, Wallace, NC 28466
Facility Address:
851 Old Wilmington Road, Wallace, NC 28466
Permitted Flow:
5.42 MGD
Facility Type/Waste:
MAJOR Municipal; 97.8% domestic, 2.2% industrial*
Facility Class:
Grade IV Biological Water Pollution Control System
Treatment Units:
Spiral mechanical screen, Vortex grit removal system, Influent flow meter
system, Influent composite sampler with proportional sampling control,
Influent transfer basin, Three Sequencing Batch Reactor (SBR) basins,
Five blowers, One post aeration basin, Two tertiary disk filters, Two UV
disinfection channel units, Effluent basin, Effluent flow meter system,
Effluent composite sampler, One aerobic sludge digester, Three blowers,
Two sludge thickening basins, Sludge truck loading station, emergency
generator
Pretreatment Program (Y/N)
Y; LTMP
County:
Duplin
Region
Wilmington
*Based off of permitted flows. Includes IUPs from Town of Burgaw (satellite community).
Briefly describe the proposed permitting action and facility background: The Town of Wallace has
applied for an NPDES permit renewal at 5.42 MGD for the Wallace Regional WWTP. This facility serves
a population of approximately 9,500 residents across the Towns of Wallace, Burgaw, Teachey and
Greenevers, as well as 3 significant industrial users (SIUs), including 1 categorical industrial user (CIU),
via a Division -approved pretreatment program. Treated domestic and industrial wastewater is discharged
into Rockfish Creek, a class C;Sw waterbody in the Cape Fear River Basin. No drinking water intakes
exist downstream of Outfall 001.
Page 1 of 13

In their application, the Town indicated an average daily volume of I&I of approximately 0.54 MGD. The
Town is rehabilitating the segments of their distribution system known to have high I&I rates using DWI
and other funding sources. The older sections of the collection system is being rehabilitated in phases.
Phase 1 is complete. Phases 2 and 3 are funded and construction is scheduled for 2023 and 2024.
The Town also indicated near -term scheduled improvements including a Programmable Logic Controller
(PLC) Upgrade and Grit Removal System Upgrade, with the estimated deliver for the PLC parts in
December 2023 and the estimated delivery not yet known for the Grit Removal System. Additionally, the
Town noted Decanter Installation and Activation in a SBR with anticipated operation level attainment in
September 2024.
Sludge disposal: When the plant came on-line in 2012, sludge was hauled off -site by Triple S for
injection after testing the fecal count. Starting in September of 2022, Triple S was no longer able to inject
sludge from Wallace Regional WWTP and the Town began lime stabilizing and following Vector
Attraction Reduction (VAR) Option 6 from 40 CFR 503 Subpart D.
VAR Option 6 is to add alkali under the conditions specified. Vector attraction reduction is achieved by:
• Raising the pH of the sludge to 12 or higher by adding alkali
• Maintaining pH at 12 or higher for at least 2 hours without the addition of more alkali
• Maintaining the pH at 11.5 or higher for another 22 hours without the addition of more alkali
Triple S still hauls Wallace Regional WWTP sludge off site to their farm in Beulaville. Triple S thru Bob
Branch (Branch Residuals & Soils, LLC) prepares and reports to the EPA the sludge report for the Town.
2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 — Rockfish Creek
Stream Segment:
18-74-29
Stream Classification:
C;Sw
Drainage Area (mi2):
161.6
Summer 7Q10 (cfs)
4.2
Winter 7Q10 (cfs):
16
30Q2 (cfs):
17
Average Flow (cfs):
226
IWC (% effluent):
67
2022 303(d) listed/parameter:
Not listed
Subject to TMDL/parameter:
Yes- State wide Mercury TMDL implementation.
Basin/ HUC:
Cape Fear River/03030007
USGS Topo Quad:
127 NW Wallace East, NC
Page 2 of 13

3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of January 2019 through June 2023.
Table 1. Effluent Data Summary Outfal1 001
Permit
Parameter
Units
Average
Max
Min
Limit
Flow
MGD
1.4
10.71
0.634
MA 5.42
BOD summer
mg/l
35
< 2
WA 7.5
MA 5.0
BOD winter
mg/l
52
< 2
WA 15.0
MA 10.0
NH3N summer
mg/1
' .
14.2
0.1
WA 3.0
MA 1.0
WA 6.0
NH3N winter
mg/1
0.5
8.9
0.05
MA 2.0
WA 45.0
TSS
mg/1
14.0
186
2.5
MA 30.0
6.0 > pH <
pH
SU
7.4
8
6.5
9.0
(geometric)
(geomean)
Fecal coliform
#/100 ml
26000
< 1
WA 400
7.6
MA 200
DO
mg/1
8.0
12.9
5
DA >6.0
Monitor &
Conductivity
µmhos/cm
696
16800
< 1
Report
Monitor &
Temperature
° C
20.2
29
10
Report
Monitor &
NO2+NO3
mg/1
3.6
10.5
0.02
Report
Monitor &
TKN
mg/l
2.8
9.2
0.5
Report
Monitor &
TN
mg/l
6.2
15.4
1.2
Report
Monitor &
TP
mg/1
2.1
8.23
0.12
Report
Monitor &
Total Cadmium
µg/l
< 0.5
< 10
< 0.5
Report
Monitor &
Total Silver
µg/1
< 1
< 10
< 1
Report
Monitor &
Total Hardness
mg/l
94
116
75
Report
MA -Monthly Average, WA -Weekly Average, DM -Daily Maximum, DA=Daily Average
Page 3 of 13

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, temperature, and
conductivity 200 feet upstream of discharge to Rock Fish Creek and 0.98 mile downstream of previous
active NC0020702 discharge to Rock Fish Creek. Upstream and downstream samples are collected three
times per week during June, July, August and September then once per week in the remaining months of
the year. Instream data from January 2019 through May 2023 has been summarized below in Table 2.
Table 2. Instream Monitoring Data Summary
Parameter
Units
Upstream
Downstream
Average
Max
Min
Average
Max
AM
Temperature
° C
20.6
30
2
20.2
29
2.93
DO
mg/1
7.1
15.1
3.62
6.5
14.3
2.9
Conductivity
µmhos/cm
267
2100
68
276
910
19
Hardness
mg/1
52
92
26
-
I -
-
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.
Downstream temperature was not greater than 32 degrees Celsius [per 15A NCAC 02B .0211 (18)]
during the period reviewed. Downstream temperature was greater than upstream temperature by more
than 2.8 degrees Celsius on 4 occasions during the period reviewed. It was concluded that no statistically
significant difference exists between upstream and downstream temperature. Monitoring has been
maintained.
Average downstream DO was above 5 mg/L [per 15A NCAC 02B .0211 (6)] during the period reviewed.
Downstream DO was observed at levels less than 4.0 mg/L on 9 occasions during the period reviewed
while upstream DO was only observed at levels less than 4.0 mg/L on 1 occasion during the period
reviewed. It was concluded that a statistically significant difference exists between upstream and
downstream DO. While downstream DO was observed at levels less than 4.0 mg/L more frequently than
upstream DO, this may in part be associated with the receiving stream's Swamp waters designation.
Monitoring has been maintained.
It was concluded that no statistically significant difference exists between upstream and downstream
conductivity. Monitoring has been maintained.
Per discussion with the DWR Basin Planning Branch, instream monitoring for fecal coliform, TKN,
NO2+NO3 and TP has been added to the permit at a monthly frequency. These data are to be used to
inform the Division of influence from the Wallace Regional WWTP on the receiving stream, and to
differentiate impacts from this facility and the House of Raeford Farms WWTP NC0003344 located
upstream of the Wallace Regional WWTP discharge. The inclusion of these monitoring requirements may
be reevaluated in the future.
Page 4 of 13

The current instream sampling location is —200 feet upstream of the outfall location and has the potential
for influence from the outfall itself. After discussion with both the DWR Basin Planning Branch and the
Town of Wallace, it was determined that an appropriate and safe upstream monitoring location is
approximately 1.1 miles upstream of the discharge at Willard Railroad Street. Additionally, the current
downstream sampling location is 0.98 miles downstream of previous active NC0020702 discharge to
Rock Fish Creek. This location is inaccessible and has been reported by the Town as an unsafe location to
conduct sampling. As such, the Town has requested the downstream monitoring station be moved to a
location approximately 0.8 miles downstream of the discharge at the previously active NC0020702
outfall.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition: N/A
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): In 2018, the facility reported
1 ammonia limit violation resulting in enforcement The facility reported 10 BOD limit violations, 1 fecal
coliform limit violation and 2 ammonia limit violations in 2019 resulting in enforcement. In 2020, the
facility reported 3 BOD limit violations and 6 ammonia limit violations resulting in enforcement. The
facility reported 17 BOD limit violations, 13 ammonia limit violations and 1 dissolved oxygen limit
violation resulting in enforcement in 2021. In 2022, the facility reported 6 BOD limit violations and 2
ammonia limit violations resulting in enforcement.
In discussing the compliance history with the Wilmington Regional Office, it was revealed that the issues
observed at the plant in 2018 were related to equipment damage as a result of Hurricane Florence. The
Facility continued to be plagued with equipment -related issues, with various correspondences throughout
2021 and 2022 with the Town indicating issues with malfunction decanters and diffusers in two of the
three SBR basins, blower issues, and issues with the carpet media on both filters needing to be replaced
leading to fouling. The Town has consistently communicated with the Regional Office these issues and
the timeline by which they were resolved (correspondences attached). The Town has completed their
filter media replacement and cleaning and conducted a cleaning of their UV system. Rehabilitation of the
SBRs is ongoing.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): Per correspondence with the Town and confirmation with the DWR Aquatic Toxicology
Branch, the Town did not conduct toxicity testing in 2019 or the first half of 2020 due to Hurricane
Matthew flooding and damaging the UV disinfection system and liquid bleach being fed to the plant after
Equalization. The Town was able to repair their UV system and raise the whole system to higher ground
but Hurricane Florence was nevertheless able to flood the new system prior to any toxicity testing being
conducted. The Town needed to revert to feeding liquid bleach and continued to report "no flow" for their
toxicity reports until the UV system was back up in mid-2020. The facility passed 12 of 12 quarterly
chronic toxicity tests, as well as all 4 second species chronic toxicity tests from July 2020 to April 2023.
Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in April 2023 reported that the facility was compliant. The last pretreatment inspection conducted in May
2023 reported that the facility was not compliant with its pretreatment requirements due to failure to
initiate enforcement according to the Division -approved Enforcement Response Plan. A Notice of
Violation was issued.
Page 5 of 13

6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 213.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic
Life; non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A 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/l 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 BOD
limits are based on speculative limits developed in 2009 when the Town requested the Division to
combine their discharge from NC0020702 Wallace WWTP with the Wallace Regional WWTP
NC0003450 into a single discharge per an interlocal agreement between the Towns of Wallace and
Teachey. 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/l (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.
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 permit does
not currently set limits or monitoring requirements for TRC due to the facility employing UV treatment
for disinfection. However, in the event of an emergency where chlorination is required as a backup or
temporary means of disinfection at the facility, a TRC limit and monitoring requirement have been added
to the permit based on the review in the attached WLA spreadsheet. Please note that TRC monitoring is
only required in the event that chlorine is used at the plant and as part of the regular Effluent Pollutant
Scans.
The existing ammonia limits are based on speculative limits developed in 2009 when the Town requested
the Division to combine their discharge from NC0020702 with the Wallace Regional WWTP NC0003450
into a single discharge per an interlocal agreement between the Towns of Wallace and Teachey. The
ammonia limits have been reviewed in the attached WLA and have been found to be protective. No
changes were made.
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
Page 6 of 13

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 %2 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 January 2019
and March 2023. Pollutants of concern included toxicants with positive detections and associated water
quality standards/criteria. Based on this analysis, the following permitting actions are proposed for this
permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable
water quality standards/criteria: Total Copper, Total Cyanide
• 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: None
• No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria and the maximum predicted concentration was <50% of the allowable
concentration: Total Arsenic, Total Cadmium, Total Chromium, Total Lead, Total Nickel, Total
Selenium, Total Silver, Total Zinc
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern.
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: None
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: None
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
Beryllium, 1,4-dioxane
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.
Toxicitv 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: This is a Major POTW, and a chronic WET limit at 67%
effluent will continue on a quarterly frequency.
Page 7 of 13

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/l.
Table 4. Mercury Effluent Data Summary
2019
2020
2021
2022
2023
# of Samples
1
4
4
4
2
Annual Average Conc. n /L
88.4
5.2
4.7
3.47
39.18
Maximum Conc., n L
88.4
9.04
8.29
7.76
76.6
TBEL, n /L
47
WQBEL, n /L
18
Describe proposed permit actions based on mercury evaluation: Since the annual average mercury
concentration exceeded the WQBEL on two occasions, and two individual mercury samples exceeded the
TBEL, an annual average total mercury limit and quarterly monitoring has been added. Since the facility
is >2 MGD and reported quantifiable levels of mercury (> 1 ng/1), the mercury minimization plan (MMP)
has been maintained.
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit: NA
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: As required by Session
Law 2018-5, Senate Bill 99, Section I LI r), every applicant shall submit documentation of any additional
pollutants for which there are certified methods with the permit application if their discharge is
anticipated via a Chemical Addendum to NPDES Application table. As an attachment to the permit
application, the Town informed the Division that no monitoring for additional pollutants has been
conducted (see attached chemical addendum) and therefore no additional pollutants of concern have been
identified.
In 2019, based on the EPA's Third Unregulated Contaminant Monitoring Rule indicating elevated
concentrations of PFAS and 1,4-dioxane in the Cape Fear River Basin, the Division required facilities in
the basin with pretreatment programs conduct investigative monitoring of their influents for PFAS and
1,4-dioxane.
The Town of Wallace participated in this investigation and reported non -detect for 1,4-dioxane each of
the 3 influent samples collected. The Town reported PQLs of < 400 ug/L for the first test and < 1000 ug/L
for the second and third test. No drinking water intakes exist downstream of Outfall 001. Based on an
average annual flow of 226 cfs and a non-WS Instream Target Value of 80 ug/L for 1,4-dioxane, the
allowable discharge concentration for the Wallace Regional WWTP is 2,232 ug/L. As the Town's
investigative monitoring reported no detections at PQLs that are sufficiently sensitive considering the
Page 8 of 13

facility's allowable discharge concentration, no drinking water intakes exist downstream of the discharge,
and no SIU indicated in the facility's pretreatment program (or the pretreatment program of the satellite
community Burgaw's pretreatment program) are related to the use or discharge of 1,4-dioxane, no
monitoring for 1,4-dioxane was made.
During the 2019 investigation, the Town monitored for and found the presence of some HAS compounds
in their influent during each of the three sampling events. No drinking water intakes exist downstream of
the discharge. To better understand the contribution of HAS compounds from the Wallace Regional
WWTP, monitoring of HAS chemicals will be added to the permit at a frequency of 2/year. Since an
EPA method for sampling and analyzing PFAS in wastewater is not currently available, the PFAS
sampling requirement in the Permit includes a compliance schedule which delays the effective date of this
requirement until the first full calendar quarter beginning 6 months after EPA has a final wastewater
method in 40 CFR 136 published in the Federal Register. This date may be extended upon request and if
there are no NC -certified labs.
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H. 0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: As total copper and total
cyanide demonstrated reasonable potential to exceed the facility's allowable discharge concentrations
based on state surface water standards, monthly average and daily maximum limits have been put in the
permit for total copper and total cyanide. After discussing the limits with the Permittee, the Permittee
does not believe a schedule of compliance is needed for the proposed limits. As such, no compliance
schedule has been added.
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 mg1l
BODS/TSS for Monthly Average, and 45 mg/l for BODS/TSS for Weekly Average). YES
If NO, provide a justification for alternative limitations (e.g., waste stabilization pond). NA
Are 85% removal requirements for BOD51TSS included in the permit? YES; Overall BOD and TSS
removal was greater than 85%; TSS removal was observed at < 85% on occasion during the period
reviewed.
If NO, provide a justification (e.g., waste stabilization pond). NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA
Page 9 of 13

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; monitoring has been
removed for total cadmium and total silver.
If YES, confirm that antibacksliding provisions are not violated: All reported total cadmium and total
silver samples were non -detect and did not trigger limits in the RPA.
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 213.0500; 2)
NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
considered effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
The facility sends treated wastewater post UV disinfection through approximately 5,906 linear feet of
pipe via an outfall line to the receiving stream. Effluent sampling was conducted at the outfall at Rockfish
Creek but was moved after the flooding due to the 2018 hurricane season causing safety concerns.
Currently, effluent sampling is conducted up at the effluent wet well. Per 40 CFR 122.410), samples and
measurements taken for the purpose of monitoring shall be representative of the monitored activity. Due
to the lack of residual treatment, recontamination is a concern within the pipe. While concurrent effluent
data was not available to conduct a statistical analysis between samples collected up at the facility and
down at the outfall after the piping, past data was available for review from the Town from when
sampling was conducted down at the outfall. Data review for fecal coliform, dissolved oxygen and pH
sampling events from February 2013 through May 2018, as provided in the 2018 fact sheet, provides the
summary shown below in Table 5.
Table 5. DMR Effluent Data Summary 2/2013 — 5/2018
Parameter
Units
Average
Max
Min
pH
SU
7.3
9
6.2
Fecal coliform
#/100 ml
geomean16
> 60,000
< 1
DO
mg/1
8.3
15.7
5.5
In comparing the summary from Table 5 with the effluent data summary which includes data post -
sampling location alteration, there does not appear to be an appreciable difference between the two
datasets for the parameters of concern (pH, fecal coliform and DO). As such, no requirement to conduct
concurrent sampling at the two separate locations has been added to the permit at this time. Please note
that verification of this conclusion may be necessary at a later date, as the Town had noted in their
correspondence that their UV system went down during Hurricane Florence, which lead to the feed of
liquid bleach for disinfection, which shocked the line and would inhibit bacterial regrowth.
Page 10 of 13

11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs) electronically. While NPDES regulated facilities would initially be required to submit additional
NPDES reports electronically effective December 21, 2020, EPA extended this deadline from December
21, 2020, to December 21, 2025. The current compliance date, effective January 4, 2021, was extended as
a final regulation change published in the November 2, 2020 Federal Register. This permit contains the
requirements for electronic reporting, consistent with Federal requirements.
12.Summary of Proposed Permitting Actions:
Table 6. Current Permit Conditions and Proposed Changes Outfall 001
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 5.42 MGD
No change
15A NCAC 2B .0505
BOD5
Summer:
No change
WQBEL. 2009 Speculative Limits;
MA 5.0 mg/l
Surface Water Monitoring, 15A
WA 7.5 mg/l
NCAC 2B. 0500
Winter:
MA 10.0 mg/l
WA 15.0 mg/l
Monitor and report
Dail
NH3-N
Summer:
No change
WQBEL. 2009 Speculative Limits;
MA 1.0 mg/1
2023 WLA; Surface Water
WA 3.0 mg/l
Monitoring, 15A NCAC 2B. 0500
Winter:
MA 2.0 mg/l
WA 6.0 mg/l
Monitor and report
Dail
TSS
MA 30 mg/l
No change
TBEL. Secondary treatment
WA 45 mg/l
standards/40 CFR 133 / 15A NCAC
Monitor and report
2B .0406; Surface Water Monitoring,
Daily
15A NCAC 2B. 0500
Fecal coliform
MA 200 /100ml
No change
WQBEL. State WQ standard, 15A
WA 400 /100ml
NCAC 2B .0200; Surface Water
Monitor and report
Monitoring, 15A NCAC 2B. 0500
Dail
Temperature
Monitor and Report
No change
Surface Water Monitoring, 15A
Daily
NCAC 2B. 0508
DO
> 6 mg/l
No change
WQBEL. State WQ standard, 15A
Monitor and Report
NCAC 2B .0200; 15A NCAC 02B
Daily
.0500
pH
6 — 9 SU
No change
WQBEL. State WQ standard, 15A
Monitor and Report
NCAC 2B .0200; 15A NCAC 02B
Daily
.0500
Page 11 of 13

Conductivity
Monitor and Report
No change
Surface Water Monitoring, 15A
Daily
NCAC 2B. 0500
Total Residual
No requirement
DM 25 ug/L
WQBEL. 2023 WLA. Surface Water
Chlorine
Monitor and Report Daily
Monitoring, 15A NCAC 2B. 0500; for
Effective when
backup/emergency chlorination
chlorination used
TKN
Monitor and Report
No change
For calculation of TN
Monthly
NO2+NO3
Monitor and Report
No change
For calculation of TN
Monthly
Total Nitrogen
Monitor and Report
No change
Surface Water Monitoring, 15A
Monthly
NCAC 2B. 0500
Total
Monitor and Report
No change
Surface Water Monitoring, 15A
Phosphorus
Monthly
NCAC 2B. 0500
Total Hardness
Quarterly
No changes
Hardness -dependent dissolved metals
monitoring
water quality standards approved in
Upstream and in
2016
Effluent
Total Silver
Monitor and Report
Remove requirement
Based on results of RPA; All values
Quarterly
non -detect < 10 ug/L, and < 1 ug/L -
No Monitoring required
Total
Monitor and Report
Based on results of RPA; All values
Cadmium
Quarterly
Remove requirement
non -detect < 10 ug/L, < 1 ug/L and <
0.5 ug/L - No Monitoring required
MA 31.9 ug/L
DM 45.2 ug/LMonitor
WQBEL. Based on results of RPA; RP
Total Copper
No requirement
and Report
shown - apply Monthly Monitoring
Monthly
with Limit
MA 7.5 ug/L
DM 31.2 ug/LMonitor
WQBEL. Based on results of RPA; RP
Total Cyanide
No requirement
and Report
shown - apply Monthly Monitoring
Monthly
with Limit
WQBEL. Consistent with 2012
AA 18 ng/L
Statewide Mercury TMDL
Total Mercury
No requirement
Monitor and Report
Implementation. Samples detected
Quarterly
above TBEL and AA above WQBEL
during review
Evaluation of PFAS contribution:
Add 2/year monitoring
pretreatment facility above state
PFAS
No requirement
with delayed
border; Implementation delayed until
implementation
after EPA certified method becomes
available.
Toxicity Test
Chronic limit, 67%
No change
WQBEL. No toxics in toxic amounts.
effluent
15A NCAC 2B.0200 and 15A NCAC
213.0500
Instream
Monitor DO,
Add monthly monitoring
Surface Water Monitoring, 15A
monitoring
temperature and
for fecal coliform, TKN,
NCAC 2B. 0500; Per discussions with
conductivity three
NO2+NO3 and TP; revise
Basin Planning Branch and Permittee
times per week
instream sampling
regarding safety
during June, July,
locations
Page 12 of 13

August and
September then once
per week in the
remaining months of
the year
Effluent
Three times per
No change; conducted in
40 CFR 122
Pollutant Scan
permit cycle
2025, 2026, 2027
Mercury
MMP Special
No change; MMP
Consistent with 2012 Statewide
Minimization
Condition
maintained
Mercury TMDL Implementation.
Plan (MMP)
Electronic
Electronic Reporting
No change
In accordance with EPA Electronic
Reporting
Special Condition
I
Reporting Rule 2015.
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
13. Public Notice Schedule:
Permit to Public Notice: 8/3/2023
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. NPDES Division Contact
If you have any questions regarding any of the above information or on the attached permit, please
contact Nick Coco at [phone] or via email at nick.cocogdeq.nc.gov.
15. Fact Sheet Addendum (if applicable):
The draft was submitted to the Town of Wallace, EPA Region IV, and the Division's Wilmington
Regional Office, Aquatic Toxicology Branch, Basin Planning Branch, Pretreatment Program and
Operator Certification Program for review. Comments were received from the Town of Wallace on
August 28, 2023 requesting the Division revise the component list to accurately reflect the current
treatment works. No comments were received from any other party.
Were there any changes made since the Draft Permit was public noticed (Yes/No): YES
If Yes, list changes and their basis below:
• Special Condition A.(6.) PFAS Monitoring Requirements has been updated to include reference to
the most recent 4th Draft of EPA Method 1633, released in July 2023.
• The component list has been revised to reflect updates provided by the Town.
16. Fact Sheet Attachments (if applicable):
• RPA Spreadsheet Summary
• NPDES Implementation of Instream Dissolved Metals Standards — Freshwater Standards
• NH3/TRC WLA Calculations
• BOD & TSS Removal Rate Calculations
• Mercury TMDL Calculations
• Monitoring Frequency Reduction Evaluation
• POC Review Form
• WET Testing and Self -Monitoring Summary
• Compliance Inspection Report
• Requested Additional Information
• Chemical Addendum
Page 13 of 13

el Ibred
Media of Eastern North ('aroma
The Daily Reflector - The Daily Advance - The Rocky Mount Telegram
Bertre Ledger - Chowan Herald Duplin Times - Farmville Enterpnse Perqumnans Weekly
Standard Laconic - Tarboro Weekly Times Leader - Williamston Enterprise
PO Box 1967, Greenville NC 27635
[phone]
❑Cas r 151rd
❑Chec
Date Paid
NCDENR/DWR/401 Copy Line Issue NPDES Wastewater
1617 MAIL SERVICE CENTER Lines 56
BUFFER PERMITTING BRANCH Total Price. $112 00
RALEIGH NC 27699-1617
Account. 116382 Ticket. 449672
PUBLISHER'S AFFIDAVIT
NORTH CAROLINA
Public Notice
North Carolina Environmental
Duplin County
Management CommissionfNPDESUnit
1617 Mail Service Center
Raleigh, NC 27699 1617
—,A xra—i a �1✓ is _ affirms that he/she is clerk of The
Notice of Intent to Issue NPDES Waste
water Permit NC0003450 Wallace Re
Duplin Times, a newspaper published weekly at Kenansville, Duplin County,
gional WWTP, and NBcu
Iavillc WWTP The Northorth CC arolina
North Carolina, and that the advertisement, a true copy of which is hereto at-
Environmental Management Commis
tached, entitled Issue NPDES Wastewater was published in said The Duplin
Sion proposes to issue a NPDES waste-
water discharge permit to the person(s)
Times on the following dates:
listed below. Written comments regard-
ing the proposed permit will be accept -
until 30 days after the publish date
y g
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.
and that the said newspaper in which such notice, paper, document or legal
Please mail comments and/or informa
advertisement was published, was at the time of each and every publication, a
Lion requests to DWR at the above ad
dress. Interested persons may visit the
newspaper meeting all of the requirements and qualifications of Chapter 1, Sec
9 q
DWR at 512 N. Salisbury Street, Raleigh,
tion 597 of the General Statutes of North Carolina and was a qualified newspaper
NC 27604 to review the information on
within the meaning of Chapter 1 Section 597 of the General Statutes of North
Adermits iti his nfotri eation on may be NPDES
file.
nd
Carolln
on our website: hnps:Udeq.nc.govlpub
lic notices -hearings, or by calling (919)
707-3601. The Town of Wallace 1316
_
E. Murray Street, Wallace, NC 28466]
has requested renewal of NPDES per -
AM red and subscribed before me this 18th dayof September 2023
AM P
for as Wallace Region -
al Wastewater Treatment Plant, located
al Wastewater
in Duplin County. This permitted facili-
Ydischarges treated municipal and in
ustrial wastewater to Rockfish Creek,
(Notaryc Signature)
a class C;Sw water in the Cape Fear Riv
er Basin Currently ammonia, fe
cal coli{orm. D0, pH,. total residual chlo
rine, total copper, total cyanide and
(Notary Public Printed Name)
total mercury are water quality limit
ed. This discharge may affect future
allocations in this segment of Rockfish
Q^
My commission expires C7L
Creek Town of Beulaville (PO Box 130,
Beulaville, NC 285181 has requested re
newal of permit NCO026018 for Beu
laville WWTP (352 Lyman Road] located
in Duplin County. This permitted facility
KIMBERLY GOFF BANDY discharges treated wastewater to Per-
simmon Branch in the Cape Fear River
Notary Public, North Carolina Basin. Currently, BOD, Ammonia Nitro-
gen, Total Residual Chlorine, and Fecal
Coliform are water quality limited This
My Co rr m i ss ion Expires discharge may affect future allocations
=� February22, 2026 in this segment of Persimmon Branch
449672 8812023

Coco, Nick A
From:
Lisa H. Cottle <[e-mail]>
Sent:
Monday, August 28, 2023 2:25 PM
To:
Coco, Nick A
Cc:
Montebello, Michael J; King, Morella s; Perez, Helen I; Kinney, Maureen; Moore, Cindy; Nicholson,
Molly; Deamer, Nora; Shepherd, Forest T; Mcgee, Keyes
Subject:
[External] RE: Draft Permit Wallace Regional WWTP, NPDES Permit Number NC0003450, SIC Code
4952
Follow Up Flag:
Follow up
Flag Status:
Flagged
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message
button located on your Outlook menu bar on the Home tab.
Nick,
I have reviewed the permit and only have a couple of things that need to be removed.
• On Page 2 Supplement to permit cover sheet, bullet point # 11 "effluent composite sampler" can be removed
as you list it again 3 bullet points later as "effluent composite sampler with proportional sampling controls".
• Bullet point #13 "effluent flow meter system with recorder". Our flow meter has a totalizer but not a chart
recorder. My operators manually record the flow reading every morning onto a log sheet.
• Also ,the last bullet point " additional emergency connection capability at outfall" can be removed as that
connection was removed when the flow meter and sampler were moved to the WWTP from the flooded site
near the creek after the hurricane.
Let me know if you have any questions.
Lisa Cottle
Wastewater Superintendent
Wallace Regional Wastewater Treatment Plant
851 Old Wilmington Rd
Wallace, NC 28466
[e-mail]
910-665-2091
From: Coco, Nick A <[e-mail]>
Sent: Monday, July 31, 2023 8:46 AM
To: Lisa H. Cottle <[e-mail]>
Cc: Montebello, Michael J <[e-mail]>; King, Morella s <[e-mail]>;
Perez, Helen I <[e-mail]>; Kinney, Maureen <[e-mail]>; Moore, Cindy
<[e-mail]>; Nicholson, Molly <[e-mail]>; Deamer, Nora
<[e-mail]>; Shepherd, Forest T <[e-mail]>; Mcgee, Keyes
<[e-mail]>
Subject: Draft Permit Wallace Regional WWTP, NPDES Permit Number NC0003450, SIC Code 4952
Hi Lisa,
I hope all is well.

Please see the following links to review the draft permit and cover letter and draft fact sheet for NPDES permit
NC0003450 for the Wallace Regional WWTP. I have also provided a link to the NPDES Standard Conditions for your
reference. The Town has a 30-day period ending on 9/04/2023 to comment, ask questions, or request an extension to
review this draft permit. Please contact me with any comments you might have.
Draft
Permit: https://edocs.deg.nc.gov/WaterResources/DocView.aspx?id=2888770&dbid=0&repo=WaterResources&cr=1
NPDES Standard Conditions: https://bit.ly/3k5NFaL
Draft Fact Sheet: https://edocs.deg.nc.gov/WaterResources/DocView.aspx?id=2895692&dbid=0&repo=WaterResources
A physical copy of the draft permit is also being mailed to you.
Thanks, and have a nice day.
Best,
Nick Coco, PE (he/him/his)
Engineer ///
NPDES Municipal Permitting Unit
NC DEQ / Division of Water Resources / Water Quality Permitting
Office: [phone]
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
D- E-
NORTH CAROLINA kl;
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.
- DISCLAIMER: Pursuant to North Carolina General Statutes Chapter 132, Public Records, this electronic mail message
and any attachments hereto, as well as any electronic mail message(s) sent in response to it may be considered public
record and as such, subject to request and review by anyone at any time.
- DISCLAIMER: Pursuant to North Carolina General Statutes Chapter 132, Public Records, this electronic mail message
and any attachments hereto, as well as any electronic mail message(s) sent in response to it may be considered public
record and as such, subject to request and review by anyone at any time.

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Wallace Regional WWTP
IV
NC0003450
001
5.420
Rockfish Creek
03030007
C;Sw
ElApply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1 Q10s (cfs)
Effluent Hardness
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
4.200
16.00
17.00
226.00
3.51
94.08 mg/L (Avg)
51.71 mg/L (Avg)
79.96 m /L
81.6 m /L
Data Source(s)
❑ CHECK TO APPLY MODEL
REQUIRED DATA ENTRY
Par01
Par02
Par03
Par04
Par05
Par060
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Table 2. Parameters of Concern
Name WQs Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
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
1.4197
FW
9.0911
ug/L
Chlorides
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
305.1005
FW
2384.7318
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
21.2830
FW
31.9208
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
10.7185
FW
281.2301
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
-,^"
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
99.5608
FW
911.8805
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
2.2673
ug/L
Zinc
Aquatic Life
NC
339.4122
FW
342.4868
ug/L
1,4-dioxane
Human Health
C
80
HH
pg/L
3450 RPA, input
6/30/2023

REASONABLE POTENTIAL ANALYSIS
H1
I Effluent Hardness I
Date
1 3/27/2019
2 4/1/2019
3 7/1/2019
4 10/9/2019
5 1 /6/2020
6 4/20/2020
7 7/14/2020
8 10/13/2020
9 1 /5/2021
10 4/6/2021
11 7/12/2021
12 10/4/2021
13 1 /4/2022
14 4/6/2022
15 7/12/2022
16 10/4/2022
17 1 /10/2023
18 4/4/2023
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
Data
BDL=1/2DL
Results
100
100
Std Dev.
88
88
Mean
105
105
C.V.
109
109
n
88
88
10th Per value
105
105
Average Value
108
108
Max. Value
82
82
82
82
100
100
116
116
92
92
96
96
90
90
96
96
80.5
80.5
75
75
81
81
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
11.6799
94.0833
0.1241
18
80.85 mg/L
94.08 mg/L
116.00 mg/L
H2
Date Data
1 3/27/2019
2 4/1/2019
3 7/1/2019
4 7/3/2019
5 10/8/2019
6 1 /6/2020
7 4/20/2020
8 7/14/2020
9 10/13/2020
10 1 /5/2021
11 4/6/2021
12 7/12/2021
13 10/4/2021
14 1 /4/2022
15 4/5/2022
16 7/11/2022
17 7/12/2022
18 10/3/2022
19 10/4/2022
20 1 /10/2023
21 4/4/2023
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
Upstream Hardness
BDL=1/2DL
54 54
40 40
89 89
92 92
87 87
44 44
50 50
50 50
44 44
30 30
26 26
36 36
90 90
58 58
50 50
28 28
30 30
38 38
42 42
64 64
44 44
Results
Std Dev.
Mean
C.V.
n
10th Per value
Average Value
Max. Value
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
21.1427
51.7143
0.4088
21
30.00 mg/L
51.71 mg/L
92.00 mg/L
3450 RPA, data
- 1 - 6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Date Data
1 10/9/2019 <
2 1 /6/2020 <
3 4/20/2020 <
4 7/14/2020 <
5 10/13/2020 <
6 1 /5/2021 <
7 4/6/2021 <
8 7/12/2021 <
9 10/4/2021 <
10 1 /4/2022 <
11 4/5/2022 <
12 7/12/2022 <
13 10/4/2022 <
14 1/10/2023 <
15 4/4/2023 <
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
Arsenic
BDL=1/2DL
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
Results
Std Dev
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
0.0000
5.0000
0.0000
15
1.00
5.0 ug/L
5.0 ug/L
-2-
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par03
Date Data
1 3/27/2019 <
2 7/16/2020 <
3 4/19/2021 <
4
5
6
7
8
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
Use "PASTE SPECIAL
Beryllium Values" then "COPY"
Maximum data
points = 58
BDL=1/2DL
Results
Date
Data
10 5
Std Dev.
0.0000
1
3/27/2019
<
10 5
Mean
5.0000
2
4/1/2019
<
10 5
C.V. (default)
0.6000
3
7/1/2019
<
n
3
4
10/9/2019
<
5
1 /6/2020
<
Mult Factor =
3.00
6
4/20/2020
<
Max. Value
5.00 ug/L
7
7/14/2020
<
Max. Pred Cw
15.00 ug/L
8
10/13/2020
<
9
1 /5/2021
<
10
4/6/2021
<
11
7/12/2021
<
12
10/4/2021
<
13
1 /4/2022
<
14
4/5/2022
<
15
7/12/2022
<
16
10/4/2022
<
17
1/10/2023
<
18
4/4/2023
<
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
Cadmium
BDL=1/2DL Results
10
5
Std Dev.
10
5
Mean
10
5
C.V.
0.5
0.25
n
0.5
0.25
0.5
0.25
Mult Factor =
0.5
0.25
Max. Value
0.5
0.25
Max. Pred Cw
0.5
0.25
0.5
0.25
1
0.5
0.5
0.25
0.5
0.25
0.5
0.25
0.5
0.25
0.48
0.24
1
0.5
0.5
0.25
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
1.8108
1.0689
1.6941
18
2.06
5.000 ug/L
10.300 ug/L
-3-
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par10
Chromium, Total
Use "PASTE SPECIAL
Values" then "COPY"
Pal
Maximum data
points = 58
Date
Data
BDL=1/2DL
Results
Date
Data
1
10/9/2019
<
10
5
Std Dev.
0.0000
1
10/9/2019
2
1/6/2020
<
10
5
Mean
5.0000
2
1/6/2020
<
3
4/20/2020
<
10
5
C.V.
0.0000
3
4/20/2020
<
4
7/14/2020
<
10
5
n
15
4
7/14/2020
<
5
10/13/2020
<
10
5
5
10/13/2020
<
6
1/5/2021
<
10
5
Mult Factor =
1.00
6
4/6/2021
<
7
4/6/2021
<
10
5
Max. Value
5.0 pg/L
7
7/12/2021
8
7/12/2021
<
10
5
Max. Pred Cw
5.0 pg/L
8
10/4/2021
9
10/4/2021
<
10
5
9
1 /4/2022
10
1 /4/2022
<
10
5
10
4/5/2022
<
11
4/5/2022
<
10
5
11
7/12/2022
12
7/12/2022
<
10
5
12
10/4/2022
<
13
10/4/2022
<
10
5
13
1/10/2023
<
14
1/10/2023
<
10
5
14
4/4/2023
<
15
4/4/2023
<
10
5
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
Copper
BDL=1/2DL
Results
51
51
Std Dev.
10
5
Mean
10
5
C.V.
10
5
n
10
5
10
5
Mult Factor =
11
11
Max. Value
11
11
Max. Pred Cw
13
13
10
5
15
15
10
5
10
5
10
5
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
12.2142
10.4286
1.1712
14
2.06
51.00 ug/L
105.06 ug/L
-4-
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par12
Date Data
1 10/9/2019
2 1 /6/2020 <
3 4/20/2020 <
4 7/14/2020 <
5 10/13/2020 <
6 1 /5/2021 <
7 4/6/2021 <
8 7/12/2021
9 10/4/2021
10 1 /4/2022
11 4/5/2022 <
12 7/12/2022 <
13 10/4/2022 <
14 1/10/2023 <
15 4/4/2023 <
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
Par14
Use "PASTE SPECIAL
Cyanide Values" then "COPY"
Maximum data
points = 58
BDL=1/2DL Results
16
16
Std Dev.
5
5
Mean
5
5
C.V.
8
5
n
5
5
5
5
Mult Factor =
5
5
Max. Value
18
18
Max. Pred Cw
10.0
10
8.0
5
5
5
5
5
5
5
5
5
5
5
Date
4.3006 1 10/9/2019 <
6.93 2 1 /6/2020 <
0.6203 3 4/20/2020 <
15 4 7/14/2020 <
5 10/13/2020 <
1.52
6
1 /5/2021 <
18.0 ug/L
7
4/6/2021 <
27.4 ug/L
8
7/12/2021 <
9
10/4/2021 <
10
1 /4/2022 <
11
4/5/2022 <
12
7/12/2022 <
13
10/4/2022 <
14
1/10/2023 <
15
4/4/2023 <
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
Lead
BDL=1/2DL
Results
10
5
Std Dev.
10
5
Mean
10
5
C.V.
10
5
n
10
5
10
5
Mult Factor =
10
5
Max. Value
10
5
Max. Pred Cw
10
5
10
5
10
5
10
5
10
5
10
5
10
5
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
0.0000
5.0000
0.0000
15
1.00
5.000 ug/L
5.000 ug/L
-5-
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par17 & Par18
Nickel
use "PASTE
SPECIAL -
Values" then
Par19
"COPY".
Maximum data
Date
Data
BDL=1/2DL
Results
points = 58
Date
Data
1
10/9/2019
<
10
5
Std Dev.
0.0000
1
10/9/2019
<
2
1/6/2020
<
10
5
Mean
5.0000
2
1/6/2020
<
3
4/20/2020
<
10
5
C.V.
0.0000
3
4/20/2020
<
4
7/14/2020
<
10
5
n
15
4
7/14/2020
<
5
10/13/2020
<
10
5
5
10/13/2020
<
6
1/5/2021
<
10
5
Mult Factor =
1.00
6
1/5/2021
<
7
4/6/2021
<
10
5
Max. Value
5.0 pg/L
7
4/6/2021
<
8
7/12/2021
<
10
5
Max. Pred Cw
5.0 dig/L
8
7/12/2021
<
9
10/4/2021
<
10
5
9
10/4/2021
<
10
1 /4/2022
<
10
5
10
1 /4/2022
<
11
4/5/2022
<
10
5
11
4/5/2022
<
12
7/12/2022
<
10
5
12
7/12/2022
<
13
10/4/2022
<
10
5
13
10/4/2022
<
14
1/10/2023
<
10
5
14
1/10/2023
<
15
4/4/2023
<
10
5
15
4/4/2023
<
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
Selenium
BDL=1/2DL
Results
10
5
Std Dev.
10
5
Mean
10
5
C.V.
10
5
n
10
5
10
5
Mult Factor =
10
5
Max. Value
10
5
Max. Pred Cw
10
5
10
5
10
5
10
5
10
5
10
5
10
5
Use "PASTE SPECIAL -
Values" then "COPY".
Maximum data points
= 58
0.0000
5.0000
0.0000
15
1.00
5.0 ug/L
5.0 ug/L
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par20
Date Data
1 3/27/2019 <
2 4/1/2019 <
3 7/1/2019 <
4 10/9/2019 <
5 1 /6/2020 <
6 4/20/2020 <
7 7/14/2020 <
8 10/13/2020 <
9 1 /5/2021 <
10 4/6/2021 <
11 7/12/2021 <
12 10/4/2021 <
13 1 /4/2022 <
14 4/5/2022 <
15 7/12/2022 <
16 10/4/2022 <
17 1/10/2023 <
18 4/4/2023 <
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
Par21
Use "PASTE SPECIAL
Silver Values" then "COPY"
Maximum data
points = 58
BDL=1/2DL
Results
10
5
Std Dev.
10
5
Mean
10
5
C.V.
1
0.5
n
1
0.5
1
0.5
Mult Factor =
1
0.5
Max. Value
1
0.5
Max. Pred Cw
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1.7257
1.2500
1.3805
18
1.90
5.000 ug/L
9.500 ug/L
Date
1 10/9/2019
2 1 /6/2020
3 4/20/2020
4 7/14/2020
5 10/13/2020
6 1 /5/2021
7 4/6/2021
8 7/12/2021
9 10/4/2021
10 1 /4/2022
11 4/5/2022
12 7/12/2022
13 10/4/2022
14 1 /10/2023
15 4/4/2023
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
Zinc
Data
BDL=1/2DL
Results
137
137
Std Dev.
45
45
Mean
63
63
C.V.
51
51
n
50
50
29
29
Mult Factor =
63
63
Max. Value
67
67
Max. Pred Cw
90
90
68
68
61
61
33
33
25
25
58
58
40
40
Use "PASTE SPECIAL
Values" then "COPY"
Maximum data
points = 58
27.5931
58.6667
0.4703
15
1.39
137.0 ug/L
190.4 ug/L
-7-
3450 RPA, data
6/30/2023

REASONABLE POTENTIAL ANALYSIS
Par22
Use"PASTE
SPECIAL -Values"
1,4-dioxane
then "COPY".
Maximum data
points = 58
Date
Data BDL=1/2DL
Results
1
7/11/2019
< 400 200
Std Dev.
173.2051
2
8/12/2019
< 1000 500
Mean
400.0000
3
9/18/2019
< 1000 500
C.V. (default)
0.6000
4
n
3
5
6
Mult Factor =
3.00
7
Max. Value
500.0 pg/L
8
Max. Pred Cw
1500.0 pg/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
3450 RPA, data
- 8 - 6/30/2023

Wallace Regional WWTP
NC0003450
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) =
5.4200
1Q10S (cfs) =
3.51
7Q10S (cfs) =
4.20
7Q10W (cfs) =
16.00
30Q2 (cfs) =
17.00
Avg. Stream Flow, QA (cfs) =
226.00
Receiving Stream:
Rockfish Creek HUC 03030007
WWTP/WTP Class: IV
IWC% @ 1Q10S = 70.53144152
IWC% @ 7Q10S = 66.66931196
IWC% @ 7Q10W - 34.42891685
IWC% @ 30Q2 = 33.07350104
IW%C @ QA = 3.584029078
Stream Class: C;Sw
Outfall 001
Qw = 5.42 MGD
COMBINED HARDNESS (mg/L)
Acute = 81.6 mg/L
Chronic = 79.96 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
co
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
D
Aplied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standa d
Acute (FW): 482.1
Arsenic
C
150 FW(7Q10s) 340
ug/L
15 0
5.0
Chronic (FW): 225.0
No RP, Predicted Max < 50% of Allowable Cw - No
Max MDL10
Monitoring required
Arsenic
C
10 HH/WS(Qavg)
ug/L
NO DETECTS
_=
Chronic (HH): 279.0
Max MDL 10
Acute: 92.16
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
3 0
15.00
Note: n < 9
C.V. (default)
_
Chronic 9.75
All values non -detect < 10 ug/L - No Monitoring
required; Permittee shall use sufficiently sensitive test
Limited data set
NO DETECTS
Max MDL 10
methods
Acute: 12.889
Cadmium
NC
1.4197 FW(7Q10s) 9.0911
ug/L
18 0
10.300
Chronic:2.129
All values non -detect < 10 ug/L, < 1 ug/L and < 0.5
NO DETECTS
Max MDL = 10
ug/L - No Monitoring required
Acute: 3,381.1
Chromium III
NC
305.10 FW(7Q10s) 2384.73
µg/L
0 0
N/A
Chronic: 457.6
Acute: 22.7
Chromium VI
NC
11 FW(7Q1Os) 16
µg/L
0 0
N/A
Chronic: 16.5
a: No monitoring required if all Total Chromium
Chromium, Total
NC
µg/L
15 0
5.0
Max reported value = 5
samples are < 5 pg/L or Pred. max for Total Cr is <
allowable Cw for Cr VI.
NO DETECTS
Max MDL = 10
Acute: 45.26
Copper
NC
21.2830 FW(7Q10s) 31.9208
ug/L
14 5
105.06
----
-----------------------------
Chronic: 31.92--
RP shown - apply Monthly Monitoring with Limit
1 value(s) > Allowable Cw
Acute: 31.2
Cyanide
NC
5 FW(7010s) 22
10
uz/L
15 4
27.4
_ _ -----
-----------------------------
Chronic: 7.5---
3 value(s) > Allowable Cw
RP shown - apply Monthly Monitoring with Limit
Acute: 398.730
Lead
NC
10.7185 FW(7Q I Os) 281.2301
ug/L
15 0
5.000
_
Chronic 16.077
No RP, Predicted Max < 50% of Allowable Cw - No
NO DETECTS
Max MDL = 10
Monitoring required
3450 RPA, rpa
Page 1 of 2 6/30/2023

Wallace Regional WWTP
NC0003450
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw = 5.42 M G D
Acute (FW): 1,292.9
Nickel
NC
99.5608 FW(7Q10s) 911.8805
µg/L
15 0
5.0
Chronic (FW): 149.3
No RP, Predicted Max < 50% of Allowable Cw - No
Max MDL = 10
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
NO DETECTS
Chronic (WS): 37.5
Max MDL = 10
Acute: 79.4
Selenium
NC
5 FW(7Q10s) 56
ug/L
15 0
5.0
Chronic:7.5
All values non -detect < 10 ug/L and < 1 ug/L - No
Monitoring required; ; Permittee shall use sufficiently
NO DETECTS
Max MDL = 10
sensitive test methods
Acute: 3.215
Silver
NC
0.06 FW(7Q1Os) 2.2673
ug/L
18 0
9.500
Chronic: 0.090
All values non -detect < 10 ug/L, and < 1 ug/L - No
Monitoring required
NO DETECTS
Max MDL = 10
Acute: 485.6
No RP, Predicted Max < 50% of Allowable Cw - No
Zinc
NC
339.4122 FW(7Q10s) 342.4868
ug/L
15 15
190.4
Monitoring required
----- -----
Chronic
-----------------------------
No value > Allowable Cw
Acute: NO WQS
1,4-dioxane C
80 HH(Qavg)
µg/L
3 0
1,500.00000
_
Note: n <_ 9
C.V. (default)
_ _
Chronic 2232.125 All values non -detect < 1000 ug/L, and < 400 ug/L
Limited data set
NO DETECTS
Max MDL = 1000 No Monitoring required
-----------------------------
3450 RPA, rpa
Page 2 of 2 6/30/2023

Permit No. NCO003450
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 Q ality Standards/A uatic Life Protection
Parameter
Acute FW, µg/l
(Dissolved)
Chronic FW, µg/l
(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^10.9151 [ln hardness]-3.1485}
Cadmium, Acute Trout waters
WER* {1. 136672-[ln hardness](0.041838)} e^{0.9151[In hardness]-3.62361
Cadmium, Chronic
WER*{1.101672-[ln hardness](0.041838)} • e^{0.7998[ln hardness] -4.445 11
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. NC0003450
Silver, Acute
WER*0.85 • e"O.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[ln 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/WOBELs 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.
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 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, 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. NC0003450
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 + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 10 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 I + { [Kp.] [ss('+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 = (s7Q 10 + Qw) (Cwgs) — (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 s7Q 10)
s7Q 10 = 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 s7Q 10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0003450
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.
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)]
94.08
Average from 312019 to 412023
samples
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
51.71
Average from 312019 to 412023
samples
7Q10 summer (cfs)
4.2
Historical; Previous Fact Sheet
IQIO (cfs)
3.51
Calculated in RPA
Permitted Flow (MGD)
5.42
NPDES Files
Date: 7/24/2023
Permit Writer: Nick Coco
Page 4 of 4

NC0003450 Wallace Regional WWTP
BOD monthly removal rate
Month
January-19
February-19
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
RR (%)
93.85
95.45
94.70
92.91
96.33
95.77
91.96
87.91
89.49
94.55
95.32
97.04
98.29
95.79
97.49
97.70
95.47
95.89
96.57
95.10
96.52
95.80
97.24
97.78
97.66
97.57
98.22
98.28
98.13
97.30
Month
July-21
August-21
September-21
October-21
November-21
December-21
January-22
February-22
March-22
April-22
May-22
June-22
July-22
August-22
September-22
October-22
November-22
December-22
January-23
February-23
March-23
April-23
May-23
June-23
July-23
August-23
September-23
October-23
November-23
December-23
Overall BOD removal rate
RR (%)
95.87
93.53
97.05
96.50
96.75
96.55
94.79
96.80
97.55
95.22
97.70
97.79
98.16
97.79
98.66
98.27
98.21
98.44
98.25
98.40
98.34
97.86
96.36
6/28/2023
TSS monthly removal rate
Month
January-19
February-19
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
Apri I-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
RR (%)
84.89
86.28
86.86
86.25
89.54
87.74
80.44
82.70
53.71
74.13
87.95
95.07
97.82
94.43
95.82
97.20
94.58
88.31
95.38
93.49
92.41
92.25
95.05
95.97
97.15
97.66
98.18
97.30
96.66
96.36
Month
July-21
August-21
September-21
October-21
November-21
December-21
January-22
February-22
March-22
April-22
May-22
June-22
July-22
August-22
September-22
October-22
November-22
December-22
January-23
February-23
March-23
April-23
May-23
June-23
July-23
August-23
September-23
October-23
November-23
December-23
Overall TSS removal rate
RR (%)
95.27
95.77
95.94
96.15
92.77
92.49
89.44
93.95
96.40
93.69
97.20
97.22
97.36
94.19
97.50
97.99
96.50
97.31
98.12
98.61
97.92
97.01
92.70

6/28/23 WQS = 12 ng/L
Facility Name Wallace Regional WWTP/NC0003450
/Permit No. :
MERCURY WQBEL/TBEL EVALUATION
Annual Limit 18 ng/L with
Quarterly Monitoring
MMP Required
V:2013-6
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry
Value
7Q10s =
Permitted Flow =
4.200
5.420
cfs
WQBEL = 18.00 ng/L
47 ng/L
10/9/19
88.4
88.4
> TBEL
WQBEL<
88.4
ng/L -
Annual Average for 2019
1/6/20
1.3
1.3
4/20/20
2.8
2.8
7/14/20
7.84
7.84
10/13/20
9.04
9.04
5.2
ng/L -
Annual Average for 2020
1/5/21
5.35
5.35
4/6/21
2.83
2.83
7/12/21 <
5
2.5
10/4/21
8.29
8.29
4.7
ng/L -
Annual Average for 2021
1/4/22
3.84
3.84
4/5/22
7.76
7.76
7/12/22
1.32
1.32
10/4/22
0.949
0.949
3.5
ng/L -
Annual Average for 2022
1/10/23
1.76
1.76
4/4/23
76.6
76.6
> TBEL
WQBEL<
39.2
ng/L -
Annual Average for 2023

Wallace Regional WWTP/NC0003450
Mercury Data Statistics (Method 1631E)
2019
2020
2021
2022
# of Samples
1
4
4
4
Annual Average, ng/L
88.4
5.2
4.7
3.47
Maximum Value, ng/L
88.40
9.04
8.29
7.76
TBEL, ng/L
47
WQBEL, ng/L
18.0
2023
39.18
76.6

NH3/TRC WLA Calculations
Facility: Wallace Regional WWTP
PermitNo. NC0003450
Prepared By: Nick Coco
Enter Design Flow (MGD): 5.42
Enter s7Q10 (cfs): 4.2
Enter w7Q10 (cfs): 16
Total Residual Chlorine (TRC) Ammonia (Summer)
Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
4.2
s7Q10 (CFS)
4.2
DESIGN FLOW (MGD)
5.42
DESIGN FLOW (MGD)
5.42
DESIGN FLOW (CFS)
8.401
DESIGN FLOW (CFS)
8.401
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
66.67
IWC (%)
66.67
Allowable Conc. (ug/1)
25
Allowable Conc. (mg/1)
1.4
Add limit and monitoring
Less stringent than current
limit. Maintain limit.
Effective if chlorine used.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
16
Monthly Average Limit:
200/100mI
DESIGN FLOW (MGD)
5.42
(If DF >331; Monitor)
DESIGN FLOW (CFS)
8.401
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.50
Upstream Bkgd (mg/1)
0.22
IWC (%)
34.43
Allowable Conc. (mg/1)
4.8
Less stringent than current
limit. Maintain limit.
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

EPA Identification Number
NPDES Number
Facility Name Outfali Number
Wallace Regional W WTP N001
Estimated CoacentratToo` (If.
Reason Pollutant Believed Present in DischargeKnown)
Pollutant (ftequired)
NCO03450
Method %Number
CAS number (If%A plicable)
No other known pollutants
O W
Lis
(co !e Puzy,l e��

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweei 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/22 Page 1 of 7
Violation Category:Limit Violation Program Category:
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
04 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/20/19
5 X week
mg/I
7.5
8.6
14.7
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
04 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/27/19
5 X week
mg/I
7.5
8.6
14.7
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
04 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/30/19
5 X week
mg/I
5
7.27
45.5
Monthly Average
Proceed to
Concentration
Exceeded
Enforcement Case
05 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/04/19
5 X week
mg/I
7.5
8.2
9.3
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
05 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/31 /19
5 X week
mg/I
5
6
20
Monthly Average
Proceed to
Concentration
Exceeded
Enforcement Case
06 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/30/19
5 X week
mg/I
5
5.4
8
Monthly Average
Proceed to NOV
Concentration
Exceeded
07 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/06/19
5 X week
mg/I
7.5
7.75
3.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/13/19
5 X week
mg/I
7.5
8.2
9.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/20/19
5 X week
mg/I
7.5
7.8
4
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/31 /19
5 X week
mg/I
5
7.86
57.3
Monthly Average
Proceed to NOV
Concentration
Exceeded
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/03/19
5 X week
mg/I
7.5
9.4
25.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/10/19
5 X week
mg/I
7.5
10.6
41.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/17/19
5 X week
mg/I
7.5
12.8
70.7
Weekly Average
No Action, BPJ
Concentration
Exceeded
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/24/19
5 X week
mg/I
7.5
27.6
268
Weekly Average
No Action, BPJ
Concentration
Exceeded
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/31 /19
5 X week
mg/I
7.5
20.8
177.3
Weekly Average
No Action, BPJ
Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/2� Page 2 of 7
Violation Category:Limit Violation Program Category: %
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
08 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/31 /19
5 X week
mg/I
5
17.14
242.7
Monthly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/07/19
5 X week
mg/I
7.5
16.2
116.0
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/14/19
5 X week
mg/I
7.5
14.6
94.7
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/21 /19
5 X week
mg/I
7.5
10
33.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/28/19
5 X week
mg/I
7.5
7.6
1.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/30/19
5 X week
mg/I
5
11.81
136.2
Monthly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/05/19
5 X week
mg/I
7.5
8.4
12
Weekly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/12/19
5 X week
mg/I
7.5
15.8
110.7
Weekly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/19/19
5 X week
mg/I
7.5
8.8
17.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/31 /19
5 X week
mg/I
5
9.83
96.5
Monthly Average
No Action, BPJ
Concentration
Exceeded
11 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
11 /30/19
5 X week
mg/I
10
11.44
14.4
Monthly Average
No Action, BPJ
Concentration
Exceeded
05 - 2020
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/09/20
5 X week
mg/I
7.5
11
46.7
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
05 - 2020
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/31 /20
5 X week
mg/I
5
6.35
27
Monthly Average
Proceed to
Concentration
Exceeded
Enforcement Case
07 - 2020
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/31/20
5 X week
mg/I
5
5.41
8.2
Monthly Average
Proceed to
Concentration
Exceeded
Enforcement Case
06 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/12/21
5 X week
mg/I
7.5
8.4
12
Weekly Average
Proceed to NOV
Concentration
Exceeded
06 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/30/21
5 X week
mg/I
5
5.45
9.1
Monthly Average
Proceed to NOV
Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/2� Page 3 of 7
Violation Category:Limit Violation Program Category: %
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
07 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/10/21
5 X week
mg/I
7.5
8
6.7
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/17/21
5 X week
mg/I
7.5
11
46.7
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/24/21
5 X week
mg/I
7.5
11.8
57.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
07 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
07/31 /21
5 X week
mg/I
5
8.38
67.6
Monthly Average
Proceed to NOV
Concentration
Exceeded
08 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/21/21
5 X week
mg/I
7.5
10.2
36
Weekly Average
Proceed to NOV
Concentration
Exceeded
08 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/28/21
5 X week
mg/I
7.5
8.4
12
Weekly Average
Proceed to NOV
Concentration
Exceeded
08 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
08/31/21
5 X week
mg/I
5
8.18
63.6
Monthly Average
Proceed to NOV
Concentration
Exceeded
09 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/04/21
5 X week
mg/I
7.5
13.8
84
Weekly Average
Proceed to NOV
Concentration
Exceeded
09 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
09/30/21
5 X week
mg/I
5
5.67
13.3
Monthly Average
Proceed to NOV
Concentration
Exceeded
10 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/16/21
5 X week
mg/I
7.5
9.6
28
Weekly Average
Proceed to NOV
Concentration
Exceeded
10 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/23/21
5 X week
mg/I
7.5
10.2
36
Weekly Average
Proceed to NOV
Concentration
Exceeded
10 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/30/21
5 X week
mg/I
7.5
8.6
14.7
Weekly Average
Proceed to NOV
Concentration
Exceeded
10 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
10/31 /21
5 X week
mg/I
5
8.29
65.7
Monthly Average
Proceed to NOV
Concentration
Exceeded
12 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
12/18/21
5 X week
mg/I
15
16.4
9.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
12 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
12/31 /21
5 X week
mg/I
10
11.58
15.8
Monthly Average
Proceed to NOV
Concentration
Exceeded
01 -2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
01/22/22
5 X week
mg/I
15
19.25
28.3
Weekly Average
Proceed to NOV
Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/2� Page 4 of 7
Violation Category:Limit Violation Program Category: %
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
01 -2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
01/31/22
5 X week
mg/I
10
10.5
5
Monthly Average
Proceed to NOV
Concentration
Exceeded
04 - 2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/09/22
5 X week
mg/I
7.5
16.2
116.0
Weekly Average
Proceed to NOV
Concentration
Exceeded
04 - 2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/16/22
5 X week
mg/I
7.5
8.2
9.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
04 - 2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/30/22
5 X week
mg/I
5
8.52
70.5
Monthly Average
Proceed to NOV
Concentration
Exceeded
06 - 2022
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/11/22
5 X week
mg/I
7.5
9.6
28
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
09 -2018
001
Effluent
Coliform, Fecal MF, MFC
09/29/18
5 X week
#/100ml
400
437.95
9.5
Weekly Geometric Mean
No Action, BPJ
Broth, 44.5 C
Exceeded
07-2019
001
Effluent
Coliform, Fecal MF, MFC
07/06/19
5 X week
#/100ml
400
586.23
46.6
Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
08-2019
001
Effluent
Coliform, Fecal MF, MFC
08/24/19
5 X week
#/100ml
400
2,789.4
597.3
Weekly Geometric Mean
No Action, BPJ
Broth, 44.5 C
Exceeded
08 -2019
001
Effluent
Coliform, Fecal MF, MFC
08/31/19
5 X week
#/100ml
400
2,323.17
480.8
Weekly Geometric Mean
No Action, BPJ
Broth, 44.5 C
Exceeded
08-2019
001
Effluent
Coliform, Fecal MF, MFC
08/31/19
5 X week
#/100ml
200
547.91
174.0
Monthly Geometric Mean
No Action, BPJ
Broth, 44.5 C
Exceeded
07 - 2018
001
Effluent
Nitrogen, Ammonia Total (as
07/14/18
5 X week
mg/I
3
3.38
12.7
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
07 - 2018
001
Effluent
Nitrogen, Ammonia Total (as
07/31/18
5 X week
mg/I
1
1.58
57.6
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
04 - 2019
001
Effluent
Nitrogen, Ammonia Total (as
04/30/19
5 X week
mg/I
1
1
0.5
Monthly Average
No Action, BPJ
N) - Concentration
Exceeded
05 - 2019
001
Effluent
Nitrogen, Ammonia Total (as
05/31/19
5 X week
mg/I
1
2.1
109.5
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
06-2019
001
Effluent
Nitrogen, Ammonia Total (as
06/01/19
5 X week
mg/I
3
3.25
8.3
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
08 - 2019
001
Effluent
Nitrogen, Ammonia Total (as
08/24/19
5 X week
mg/I
3
7.12
137.3
Weekly Average
No Action, BPJ
N) - Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/2� Page 5 of 7
Violation Category:Limit Violation Program Category: %
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
08 - 2019
001
Effluent
Nitrogen, Ammonia Total (as
08/31 /19
5 X week
mg/I
3
4.5
50
Weekly Average
No Action, BPJ
N) - Concentration
Exceeded
08 - 2019
001
Effluent
Nitrogen, Ammonia Total (as
08/31/19
5 X week
mg/I
1
3.51
250.9
Monthly Average
No Action, BPJ
N) - Concentration
Exceeded
04 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
04/30/20
5 X week
mg/I
1
1.09
8.6
Monthly Average
Proceed to NOD
N) - Concentration
Exceeded
05 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
05/09/20
5 X week
mg/I
3
5.3
76.7
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
05 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
05/31/20
5 X week
mg/I
1
2.16
116.0
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
07 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
07/04/20
5 X week
mg/I
3
3.25
8.3
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
07 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
07/11/20
5 X week
mg/I
3
6.08
102.7
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
07 - 2020
001
Effluent
Nitrogen, Ammonia Total (as
07/31 /20
5 X week
mg/I
1
1.95
95.5
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
07 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
07/17/21
5 X week
mg/I
3
4.24
41.3
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
07 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
07/31 /21
5 X week
mg/I
1
1.7
69.5
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
08 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
08/14/21
5 X week
mg/I
3
5.96
98.7
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
08 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
08/21/21
5 X week
mg/I
3
8.78
192.7
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
08 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
08/28/21
5 X week
mg/I
3
8.18
172.7
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
08 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
08/31/21
5 X week
mg/I
1
6.38
538.2
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
09 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
09/04/21
5 X week
mg/I
3
7.26
142
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
09 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
09/11/21
5 X week
mg/I
3
3.15
5
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC0003450 MRS Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/2� Page 6 of 7
Violation Category:Limit Violation Program Category: %
Subbasin: % Violation Action: %
PERMIT: NC0003450
FACILITY: Town of Wallace - Wallace Regional WWTP
COUNTY: Duplin
REGION: Wilmington
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
09 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
09/25/21
5 X week
mg/I
3
6.28
109.3
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
09 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
09/30/21
5 X week
mg/I
1
4.1
310.0
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
10 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
10/09/21
5 X week
mg/I
3
4.66
55.3
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
10 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
10/30/21
5 X week
mg/I
3
3.36
12
Weekly Average
Proceed to NOV
N) - Concentration
Exceeded
10 - 2021
001
Effluent
Nitrogen, Ammonia Total (as
10/31/21
5 X week
mg/I
1
3.28
228.1
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
06 - 2022
001
Effluent
Nitrogen, Ammonia Total (as
06/11/22
5 X week
mg/I
3
5.74
91.3
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
06 - 2022
001
Effluent
Nitrogen, Ammonia Total (as
06/30/22
5 X week
mg/I
1
1.61
61.4
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
08-2021
001
Effluent
Oxygen, Dissolved (DO)
08/04/21
5 X week
mg/I
6
5.76
4
Daily Minimum Not
Proceed to NOV
Reached
10-2022
001
Effluent
Oxygen, Dissolved (DO)
10/01/22
5 X week
mg/I
6
5
16.7
Daily Minimum Not
No Action, BPJ
Reached
08 - 2019
001
Effluent
Solids, Total Suspended -
08/31 /19
5 X week
mg/I
45
53.04
17.9
Weekly Average
No Action, BPJ
Concentration
Exceeded
08 - 2019
001
Effluent
Solids, Total Suspended -
08/31/19
5 X week
mg/I
30
36.75
22.5
Monthly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
Solids, Total Suspended -
09/07/19
5 X week
mg/I
45
83.04
84.5
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
Solids, Total Suspended -
09/14/19
5 X week
mg/I
45
86.2
91.6
Weekly Average
No Action, BPJ
Concentration
Exceeded
09 - 2019
001
Effluent
Solids, Total Suspended -
09/30/19
5 X week
mg/I
30
55.78
85.9
Monthly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
Solids, Total Suspended -
10/12/19
5 X week
mg/I
45
69.9
55.3
Weekly Average
No Action, BPJ
Concentration
Exceeded
10 - 2019
001
Effluent
Solids, Total Suspended -
10/31/19
5 X week
mg/I
30
46.9
56.3
Monthly Average
No Action, BPJ
Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NC000345 MRs Betweel 6 - 2018 and 6 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 06/28/22 Page 7 of 7
Violation Category:Limit Violation Program Category: 0a
Subbasin: % Violation Action:
PERMIT: NC0003450 FACILITY: Town of Wallace - Wallace Regional WWTP COUNTY: Duplin REGION: Wilmington
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
11 -2019 001 Effluent Solids, Total Suspended - 11/02/19 5 X week mg/I
Concentration
11 -2019 001 Effluent Solids, Total Suspended - 11/09/19 5 X week mg/I
Concentration
11 -2019 001 Effluent Solids, Total Suspended - 11/30/19 5 X week mg/I
Concentration
45 58.32 29.6 Weekly Average No Action, BPJ
Exceeded
45 45.8 1.8 Weekly Average No Action, BPJ
Exceeded
30 45 50 Monthly Average No Action, BPJ
Exceeded

7'own of ^VaCCace
316 EAST MURRAY STREET • WALLACE, NORTH CAROLINA 28466 + PHONE: [phone]
MAYOR
Charles C. Farrior, Jr
TOWN MANAGER
Laurence Bergman
October 14, 2021
TOWN COUNCIL
Francisco Rivas -Diaz
Wanetta Carlton
William Jeffrey Carter
Frank Brinkley
Jason Wells
RE: Wallace Regional Wastewater Treatment Plant
NPDES # NC0003450
TOWN CLERK
Jackie Nicholson
TAX COLLECTOR
Robert Taylor
NOI/NOV-2021-LV00678 dated 9-14-21 and NOI/NOV-2021-LV-0710 dated 9-24-21
Dear Tom Tharrington,
FINANCE OFFICER
Robert Taylor
TOWN ATTORNEY
Anna Heath
This letter is in response to the NOI that I received on October 6, 2021 for the limit violations that
occurred in July 2021 and also for the NOI for the violations that occurred in August 2021. The monthly
and weekly limits were exceeded for BOD and ammonia and a daily DO limit was not met. I am
requesting that no civil penalty be assessed or at least reduced, to allow the funds to be used to make
the needed upgrades and repairs to the basins.
We are continuing to have blower/diffuser issues with both of the SBR's that are online. I am trying to
get repairs and upgrades to the basins done as quickly as possible. Below is a timeline of the issues and
the actions taken.
• SBR #1 and #2 both have issues with malfunctioning decanters and diffusers. Both basins
discharge slug loads of mixed liquor to the EQ with each decant.
• SBR #2 was taken offline in July 2020 for multiple problems including, malfunctioning decanter,
broken mixer, broken air lines and clogged diffusers. Repairs are almost finished and basin
should be back online by November 2021.
• SBR #3 was put online in July 2020. Basin was online for less than a year when a suspected
break in the airline occurred. One of the main trunk lines was closed to prevent further damage
and to reduce the shearing of the flock by the air turbulence.
• June 2021- blower issues begin with being unable to keep the required 2 blowers running to
meet the oxygen demand in each basin. All blowers are inspected and preventive maintenance
is done. No major problems found and the issue seems to have resolved itself.
• July 2021- the blowers for SBR #3 will not run together and keep overloading. Electrician
inspected the motor controls for problems, but agrees with our troubleshooting that back
pressure is the issue. We tried opening the valve to the broken airline to relieve the back
pressure on the blowers, however the turbulence is shearing the flock and causing poor settling
so we had to close the valve. With one blower running and using only half of the diffuser
system, we cannot provide enough oxygen that the basin requires in the summer heat.
July/ Aug/Sept 2021-We have reduced our target value for our MLSS to help reduce the oxygen
demand in the basins but with the poor biological treatment in the basins and the slug load of
pl¢agant... prograsiv¢... prosporous
FAX: [phone] • EMAIL: [e-mail] • WEB: http://www.wallacenc.gov
The Town of Wallace is an equal opportunity provider and employer.

7'own of 'NaClace
316 EAST MURRAY STREET • WALLACE, NORTH CAROLINA 28466 • PHONE: [phone]
MAYOR
Charles C. Farrior, Jr
TOWN MANAGER
Laurence Bergman
TOWN COUNCIL
Francisco Rivas -Diaz
Wanetta Carlton
William Jeffrey Carter
Frank Brinkley
Jason Wells
TOWN CLERK
Jackie Nicholson
TAX COLLECTOR
Robert Taylor
FINANCE OFFICER
Robert Taylor
TOWN ATTORNEY
Anna Heath
mixed liquor in the EQ our BOD and ammonia values are over the limit. We have done
additional cleaning of the EQ and filter area to help remove the excess sludge build-up as I
believe it is consuming what is left of the oxygen that is in the decanted effluent.
Sept/ Oct 2021- SBR #2 upgraded decanter, new decanter valve and actuator, Mixer repaired,
diffuser system repaired. Expect to have everything tested and ready to put basin online by
November
November 2021- Plan is to empty contents of SBR #3 to SBR #2 and make repairs to airline and
inspect the basin for any other potential problems. As soon as these repairs are done then we
will transfer the contents of SBR #1 to it and make the repairs to that basin which include
upgrade decanter and possibly upgrade to the diffuser system.
Since SBR #3 was put online in July 2020, we have been in compliance. When the blower issues
began in June 2021 was the first time we were non -compliant for due to these issues and we are
steadily working on getting the repairs done to bring us back into compliance.
Our BOD and ammonia results have steadily improved with our efforts to fine the correct level of
MLSS that helps lower the oxygen demand but still is able to properly treat the incoming waste
stream. BOD monthly averages for September are down to 4.6 mg/L and ammonia is at 4.1 mg/L.
If you need any other information regarding the actions that have been made to get us back in
compliance, please contact me at 910-665-2091 or by email at Icottle(@wallacenc.eov.
Sincerely,
f
J-3 l.'ls
Lisa Cottle
WWTP Superintendent/Pretreatment Coordionator
plgzmeint... progr9zsiv¢... prosp¢rou*
FAX: [phone] • EMAIL: [e-mail] • WEB: http://www.wallacenc.gov
The Town of Wallace is an equal opportunity provider and employer.

T'otivn of 1NaCCace
316 EAST MURRAY STREET • WALLACE, NORTH CAROLINA 28466 • PHONE: [phone]
TOWNCOUNCIL
TOWN CLERK
MAYOR
Wannetta Carlton, Mayor Pro -Tam
Jason Wells
Frank Brinkley
Jackie Nicholson
William Jeffrey Carter
TOWN ATTORNEY
TOWN MANAGER
Jason Davis
FINANCE OFFICER Anna H. Herring
LaurenceeBergman
Francisco Rivas -Diaz
Robert C. Taylor, Jr.
December 22, 2021
RE: Wallace Regional Wastewater Treatment Plant
NPDES # NC0003450
N O I/ N OV-2021- LV-0927
Dear Tom Tharrington,
DEC 2 2021
This letter is in response to the NOI that I received on December 17, 2021 for the limit violations that
occurred in October 2021. The monthly and weekly limits were exceeded for BOD and ammonia. I am
requesting that no civil penalty be assessed or at least reduced, to allow the funds to be used to make
the needed upgrades and repairs to the basins.
As you are aware, we have had numerous issues with the air flow to the SBR's that are online. lam
trying to get repairs and upgrades to the basins done as quickly as possible. Below is a timeline of the
issues and the actions taken.
• SBR #2 was taken offline in July 2020 for multiple problems including, malfunctioning decanter,
broken mixer, broken air lines and clogged diffusers.
• SBR #3 was put online in July 2020. Basin was online for less than a year when a suspected
break in the airline occurred. One of the main trunk lines was closed to prevent further damage
and to reduce the shearing of the flock by the air turbulence.
• June 2021- blower issues begin with being unable to keep the required 2 blowers running to
meet the oxygen demand in each basin. All blowers are inspected and preventive maintenance
is done. No major problems found and the issue seems to have resolved itself.
• July 2021 - the blowers for SBR #3 will not run together and keep overloading. Electrician
inspected the motor controls for problems, but agrees with our troubleshooting that back
pressure is the issue. We tried opening the valve to the broken airline to relieve the back
pressure on the blowers, however the turbulence is shearing the flock and causing poor settling
so we had to close the valve. With one blower running and using only half of the diffuser
system, we cannot provide enough oxygen that the basin requires in the summer heat.
• July/ Aug/Sept 2021-We have reduced our target value for our MLSS to help reduce the oxygen
demand in the basins but with the poor biological treatment in the basins and the slug load of
mixed liquor in the EQ, our BOD and ammonia values are over the limit. We have done
additional cleaning of the EQ and filter area to help remove the excess sludge build-up as I
believe it is consuming what is left of the oxygen that is in the decanted effluent.
plosant... progrqzsivv... prospQroas
FAX: [phone] • EMAIL: [e-mail] • WEB: http://www.wallacenc.gov
The Town of Wallace is an equal opportunity provider and employer.

7'own of 'Wallace
316 EAST MURRAY STREET • WALLACE, NORTH CAROLINA 28466 • PHONE: [phone]
TOWN COUNCIL
TOWN CLERK
MAYOR
Wannetta Carlton, Mayor Pro-Tem
Jason Wells
Frank Brinkley
Jackie Nicholson
William Jeffrey Carter
TOWN ATTORNEY
TOWN MANAGER
Jason Davis
FINANCE OFFICER Anna H. Herring
Laurence Bergman
Francisco Rivas -Diaz
Robert C. Taylor, Jr.
• Sept/ Oct 2021- SBR #2 upgraded decanter, new decanter valve and actuator, Mixer repaired,
diffuser system repaired. SBR was placed back on line on November 8t".
• November 2021- We began transferring the contents of SBR#3 into SBR #2 on November 8th
The inspection of SBR#3 showed that several diffusers had broken off and a secondary air line
had become detached. This had allowed the remaining diffusers to become packed with sludge
and was the cause of the back pressure to the blowers. All diffusers have been removed and we
are expecting the replacement parts to be delivered in the next few weeks.
With putting SBR #2 online that brought us back into compliance for November and the test results
so far for December have also been within our limits. As soon as we can get the repaired diffusers
installed in SBR #3, my plan is to empty SBR #1 to make repairs/upgrades to its broken diffusers and
decanter.
If you need any other information regarding the actions that have been made to get us back in
compliance, please contact me at 910-665-2091 or by email at Icottle Cepwalllace nc.aov.
Sincerely,
Lisa Cottle
WWTP Superintendent/Pretreatment Coordinator
plgasant... pro$rpsiv¢... prosp¢rous
FAX: [phone] • EMAIL: [e-mail] • WEB: http.,//www.wallacenc.gov
The Town of Wallace is an equal opportunity provider and employer.

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 1 2 u 3 I NC0003450 111 121 23/04/12 I17 18 LC] I 19 I s I 20L]
21111I I I I I I I II I I I I I I I I I I I I I I I I I I I I I I I II I I I I 1166
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
I 72 I n, I 71 I 74 79 I I I I I I I80
701a I 711 L
L—I L -1 I I
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
10:10AM 23/04/12
18/12/01
Wallace Regional WWTP
851 Old Wilmington Rd
Exit Time/Date
Permit Expiration Date
Wallace NC 28466
12:OOPM 23/04/12
23/01/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Lisa Hodges Cottle/ORC/910-665-2091/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Brent M Dean, /Public Services Director/910-285-2812/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit 0 Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran 0 Sludge Handling Dispo: Facility Site Review Effluent/Receiving Wate
Other
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
Tom Tharrington DWR/WIRO WQ/ - - /
Morella Sanchez -King DWR/WIRO WQ/910-796-7218/
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#

NPDES yr/mo/day Inspection Type
NC0003450 I11 12I 23/04/12 117 18 i c i
(Cont.)
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Morella Sanchez King and Tom Tharrington, with the DWR Water Quality Regional Operations
Section, inspected the facility on 04/12/2023 to document compliance with permit # NC003450. We
appreciate Mrs. Lisa Cottle (ORC- Grade 4# 994036) who assisted during the visit and responded to
our questions. The inspection consisted of records review and site visit and observation of the
components of the system. Please refer to the question sections of this report for more details.
The Wallace WWTF is permitted for 5.42 MGD. The average daily flow through the facility in the last
three years has been less than 25% of the permitted flow (average annual flow - 1.3 MGD).
Municipalities served at the WWTF include the Town of Wallace, Town of Burgaw, Town of Teachey,
and Town of Greenevers. Treated effluent is discharged after UV disinfection to a segment of the
Cape Fear River classified as "C".
Permit NC003450 issued in October 2018 (expired) required the following:
• A Mercury Minimization Plan,
• Analyze total cadmium (ug/1) to its Practical Quantitation Limit (PQL) of less than 0.5 ug/l.
• Analyze total silver (ug/1) to its Practical Quantitation Limit (PQL) of less than 1 ug/l.
The Wallace-WWTF is compliant with these three requirements.
The facility has scheduled improvements for 2023-2024 which include PLC upgrade, grit removal
system upgrade, and SBR # 3 decanter installation and activation.
Residuals are permitted under WQ0030998, Triple S farms handles the residuals. Records show that
residuals are well managed and in compliance with the permit.
Regarding the pretreatment program, a Notice of Violation (NOV) was issued to the facility due to the
Town's failure to properly implement the Pretreatment Program. Specifically, the Town failed to initiate
enforcement according to the Division -approved ERP due to the Town of Burgaw's unpermitted
discharge and failure to submit a SIU application by the due dates. Records also indicate a low DO
concentration presumably caused by a slug load from the Town of Burgaw on September 30 2022.
Page#

Permit: NC0003450 Owner -Facility:
Wallace Regional WWTP
Inspection Date: 04/12/2023 Inspection Type:
Compliance Evaluation
Permit
Yes
No
NA
NE
(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: The permit expired on 01/31/2023. The permitee submitted an application for permit
renewal. The Water Quality Permitting Section acknowledged
receipt of the renewal
application on 01/23/2023.
Operations & Maintenance Yes No NA NE
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: The Wallace-WWTF is well maintained. For evaluation of the treatment
process,
staff
use settleometer, MLSS, MVLSS, and microscope analysis as process control
measures and correlations. On inspection day (04/12/2023) records indicated MLSS
ranges between 1700 and 2200 mg/I.
Record Keeping
Yes
No
NA NE
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
■
❑
❑ ❑
operator on each shift?
Is the ORC visitation log available and current?
■
❑
❑ ❑
Page# 3

Permit: NC0003450
Inspection Date: 04/12/2023
Owner -Facility: Wallace Regional WWTP
Inspection Type: Compliance Evaluation
Record Keeping
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?
Facility has copy of previous year's Annual Report on file for review?
Comment: Records were available for review and well organized.
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?
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Comment: Influent and effluent flow meters were calibrated by John Glover and Associates in May
2022 and October 2022.
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 SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Comment: All pumps were present on inspection day.
Influent Sampling
# Is composite sampling flow proportional?
Is sample collected above side streams?
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 sampling performed according to the permit?
Yes
No
NA
NE
■
❑
❑
❑
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Comment: Refrigerator was at YC during the inspection. Volume collected ranges bewteen
175-225 ml per sampling.
Page# 4

Permit: NC0003450
Inspection Date: 04/12/2023
Influent Sampling
Owner -Facility: Wallace Regional WWTP
Inspection Type: Compliance Evaluation
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
Yes
No
NA
NE
•
❑
❑
❑
•
❑
❑
❑
•
❑
❑
❑
❑
■
❑
❑
•
❑
❑
❑
•
❑
❑
❑
•
❑
❑
❑
Comment: The generator was not tested on inspection day since the generator is tested for 30
minutes under load every Tuesdav at 2 PM.
Grit Removal
Type of grit removal
Yes No NA NE
a.Manual
❑
b.Mechanical
Is the grit free of excessive organic matter?
❑
❑
0
❑
Is the grit free of excessive odor?
❑
❑
0
❑
# Is disposal of grit in compliance?
❑
❑
0
❑
Comment: The facility has had continued issues with the cyclonic grit separator.
An improved grit
removal system is scheduled to be in operation by 06/30/2023.
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?
Comment:
Sequencing Batch Reactors
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
Page# 5

Permit: NC0003450 Owner -Facility:
Inspection Date: 04/12/2023 Inspection Type:
Wallace Regional WWTP
Compliance Evaluation
Sequencing Batch Reactors
Yes
No
NA
NE
Type of operation:
Duplex
Is the reactor effluent free of solids?
M
❑
❑
❑
Does minimum fill time correspond to the peak hour flow rate of the facility?
❑
❑
❑
Is aeration and mixing cycled on and off during fill?
❑
❑
❑
The operator understands and can explain the process?
❑
❑
❑
Comment: SBR reactor # 3 decanter installation and activation is scheduled to begin once the
parts are received (estimated November 2023) and end construction 07/31/2024.
Mrs. Cottle (ORC) explained the SBR process and provided related written information.
The process consists of five phases: mix fill, react fill, react, settle, and, decant with
programmed time or flow increments. Dissolved Oxygen is controlled trough the
process in the range between 2-4 mq/l.
Equalization Basins
Yes
No
NA
NE
Is the basin aerated?
❑
❑
0
❑
Is the basin free of bypass lines or structures to the natural environment?
■
❑
❑
❑
Is the basin free of excessive grease?
0
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
0
❑
❑
❑
Are float controls operable?
❑
❑
0
❑
Are audible and visual alarms operable?
❑
❑
0
❑
# Is basin size/volume adequate?
❑
❑
❑
Comment: The equalization basin at the facility is post aeration
Filtration (High Rate Tertiary)
Yes
No
NA
NE
Type of operation:
Cross
flow
Is the filter media present?
❑
❑
0
❑
Is the filter surface free of clogging?
❑
❑
■
❑
Is the filter free of growth?
❑
❑
■
❑
Is the air scour operational?
❑
❑
0❑
Is the scouring acceptable?
❑
❑
0❑
Is the clear well free of excessive solids and filter media?
❑
❑
❑
Comment:
Disinfection - UV Yes No NA NE
Are extra UV bulbs available on site? 0 ❑ ❑ ❑
Page# 6

Permit: NC0003450
Inspection Date: 04/12/2023
Disinfection - UV
Are UV bulbs clean?
Is UV intensity adequate?
Is transmittance at or above designed level?
Is there a backup system on site?
Is effluent clear and free of solids?
Owner -Facility: Wallace Regional WWTP
Inspection Type: Compliance Evaluation
Comment: Effluent after UV disinfection looked very clear and free of solids.
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?
Comment: Influent and effluent flow meters were calibrated
2022 and October 2022.
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 SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Comment: The are 4 pumps in operation.
Effluent Sampling
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
❑
❑
■
❑
John Glover and Associates in Ma
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)?
Yes
No
NA
NE
❑
❑
❑
■
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Yes
No
NA NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Comment: Temperature at the sample storage unit was 20C on inspection day. Volume collected
each sampling event ranks between 250-275 ml.
Page# 7

Permit: NC0003450
Inspection Date: 04/12/2023
Effluent Sampling
Owner -Facility: Wallace Regional WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, 0 ❑ ❑ ❑
and sampling location)?
Comment:
Effluent Pipe
Yes
No
NA
NE
Is right of way to the outfall properly maintained?
0
❑
❑
❑
Are the receiving water free of foam other than trace amounts and other debris?
■
❑
❑
❑
If effluent (diffuser pipes are required) are they operating properly?
❑
❑
0
❑
Comment:
Other Yes No NA NE
Comment: A Notice of Violation (NOV) was issued to the facility from the Pretreatment Compliance
Inspection due to the Town's failure to properly implement the Pretreatment Program.
Specifically, the Town failed to initiate enforcement according to the Division -approved
ERP due to the Town of Burgaw's unpermitted discharge and failure to submit a SIU
application by the due dates. Records also indicate a low DO concentration
presumably caused by a slug load from the Town of Burgaw on September 30 2022.
Page# 8

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 1 2 u 3 I NC0003450 I11 121 23/05/10 I17 18I D I 19 I s I 20L]
21111I I I I I I I II I I I I I I I I I I I I I I I I I I I I I I I II I I I I 1166
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
I 72 I n, I 71 I 74 79 I I I I I I I80
701� I 711 L
LJ L -1 I I
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
10:30AM 23/05/10
18/12/01
Wallace Regional WWTP
851 Old Wilmington Rd
Exit Time/Date
Permit Expiration Date
Wallace NC 28466
12:OOPM 23/05/10
23/01/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Lisa H Cottle//910-285-5927 /
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Brent M Dean, /Public Services Director/910-285-2812/
Yes
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Pretreatment
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
Helen I Perez DWR/WIRO WQ/910-796-7387/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
Morella Sanchez -King DWR/WIRO WQ/910-796-7218/
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NC0003450 I11 12I 23/05/10 117 18 1 p I
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
A Pretreatment Compliance Inspection was conducted on 05/10/2023 of the Town of Wallace's
Pretreatment Program. A NOV will be issued.
Page#

Permit: NC0003450
Inspection Date: 05/10/2023
Owner -Facility: Wallace Regional WWTP
Inspection Type: Pretreatment Compliance
Yes No NA NE
Page#

Whole Effluent Toxicity Testing and Self Monitoring Summary
United Chemi-Con
NC0000019/001
County: Ashe
Region:
WSRO
Basin: NEW02
Jan Apr Jul Oct
Ceri7dPF
Begin:
10/1/2016 chr lim: 0.75%, Episo
NonComp:
Single
7Q10:
41.0
PF: 0.2 IWC:
0.75 Freq: Q
J
F M
A
M
J
J
A
S
O
2019
Pass
- -
Pass
-
-
Pass
-
-
Pass
2020
Pass
- -
Pass
-
-
Pass
-
-
Pass
2021
Pass
- -
Pass
-
-
Pass
-
-
Pass
2022
Pass
- -
Pass
-
-
Pass
>100
-
Pass Pass
2023
Pass
- -
Pass
-
-
-
-
-
-
USMC Camp Lejeune
Hadnot Pt
WWTP NCO063029/001
County: Onslow
Region:
WIRO
Basin: WOK02
Jan Apr Jul Oct
Mvsd7dPF
Begin:
9/13/2013 chr lim: 5%
+ NonComp:
Single
7Q10:
TIDAL
PF: 15.0 IWC:
5 Freq: Q
J
F M
A
M
J
J
A
S
O
2019
>20(P)
>20(P) >20(P)
Pass
-
-
Pass
-
-
Pass
2020
Pass
- -
Pass
-
-
Pass
-
-
Pass
2021
Pass
- -
Pass
-
-
INVALID
Pass
-
Pass
2022
Pass
- -
Pass
-
-
Pass
-
-
>5
2023
Pass>20
- -
>20 Pass
-
-
-
-
-
-
Vandemere WTP
NCO088358/001
County: Pamlico
Region:
WARO
Basin: NEU10
Mar Jun Sep Dec
MVsd24PF
Begin:
11/1/2018 Ac P/F Monit: 90%
M NonComp:
7Q10:
Tidal
PF: NA IWC:
Freq: Q
J
F M
A
M
J
J
A
S
O
2019
-
- Pass
-
-
Pass
-
-
Pass
-
2020
-
- Pass
-
-
Pass
-
-
Pass
-
2021
-
- Pass
-
-
Pass
-
-
Pass
-
2022
-
- Pass
-
-
Pass
-
-
Pass
-
2023
-
- Pass
-
-
-
-
-
-
-
Wade Hampton Club
NCO062553/001
County: Jackson
Region:
ARO
Basin: SAV02
Mar Jun Sep Dec
Ceri7dPF
Begin:
10/1/2017 chr lim: 34%
NonComp:
Single
7Q10:
0.37
PF: 0.125 IWC:
34 Freq: Q
J
F M
A
M
J
J
A
S
O
2019
-
- Pass
-
-
Pass
-
-
Pass
-
2020
-
- Pass
-
-
Pass
-
-
Pass
-
2021
-
- Pass
-
-
Pass
-
-
Pass
-
2022
-
- Fail
H
Pass
>100 Pass
-
-
Pass
-
2023
-
- Pass
-
-
-
-
-
-
-
Wallace-L. Rockfish WWTP
NC0003450/001
County: Duplin
Region:
WIRO
Basin: CPF22
Jan Apr Jul Oct
Ceri7dPF
Begin:
12/1/2018 chr lim: 67%
NonComp:
Single
7Q10:
4.2
PF: 5.42 IWC:
67 Freq: Q
J
F M
A
M
J
J
A
S
O
2019
H
- -
H
-
-
H
-
-
H
2020
H
- -
H
-
-
Pass
-
-
Pass
2021
Pass
- -
Pass
-
-
Pass INVALID
>100 (P)
-
>100 (P) Pass
2022
>100(P)Pass
- -
Pass
>100(P)
-
Pass
-
-
Pass
2023
Pass
- -
Pass
-
-
-
-
-
-
SOC JOC:
N D
Pass
SOC
JOC:
N D
SOC JOC:
N
D
Pass
Pass
Pass
Pass
SOC JOC:
N
D
Pass
Pass
Pass
Pass
SOC JOC:
N D
Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Split test between Certified Labs Page 109 of 115

7/14/23, 8:02 AM
Google Maps
Google Maps current upstream location
Imagery ©2023 Airbus, CNES / Alrbus, Maxar Technologies, Map data ©2023 50 ft
Measure distance
Total distance: fi4.57 ft (19.68 m)
hops://www.google.com/maps/@34.716854, 77.9797152,158m/data=!3m1!1e3?entry=ttu 1/1

7/14/23, 7:54 AM
Google Maps upstream new location
Google Maps
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hops://www.google.com/maps/@34.714909, 77.9832066,16z?entry=ttu 1/1

7/14/23, 7:50 AM
Goc�gie Maps downstream @old WWTP outfall
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Measure distance
Total distance: 4,269.21 ft (1.30 km)
1/1
nttna�//www.000gle.com/maps/@34.7160462, 77.9797542,t5z?entry=ltu

Coco, Nick A
From: Lisa H. Cottle <[e-mail]>
Sent: Friday, July 14, 2023 9:01 AM
To: Coco, Nick A
Subject: RE: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP
Attachments: stream sample -current upstream 2023.pdf; stream sample locations 2023.pdf
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Nick,
Thanks for resending this email, I went back thru my mailbox and did find it but have no idea how I missed reading it! I
have attached maps showing where we collect our stream samples. The current location where we pull our upstream is
only 65 ft from our outfall. We stand on the middle of the bridge on the side opposite from the outfall and dodge trucks
to grab the sample. I would like for the location to be moved to the bridge on Willard Railroad street which is on a less
busy street. In addition to what I hope is a safer place for my operators to collect the sample it is also farther away -1.1
miles- from our out fall which should give you better data. Our downstream location that we have been collecting
samples is at the outfall of the old WWTP which is about 0.8 miles from our current outfall. In our old permit the
downstream location was specified to be 0.98 mile past the old outfall which is in the middle of nowhere! Somehow that
detail got missed in the last permit renewal.
Looking back over our data, I do not believe we will need a compliance schedule for the CN, Cu and Hg limits. I believe
some of those high results were due to samples being collected in the wrong bottles -influent being collected in the
effluent bottle. We have had a lot of turnover of operators at the plant and I will continue to train them on proper
sampling technique. I am in the process of giving Burgaw a permit and some of their sample results for Hg were high.
(29.9 , 6750, 196 ng/L) so I think I know where our Hg hits may be coming from.
Let me know if you need anything else.
Lisa Cottle
Town of Wallace
Wastewater Treatment Supervisor
910-665-2091
[e-mail]
From: Coco, Nick A <[e-mail]>
Sent: Thursday, July 13, 2023 1:56 PM
To: Lisa H. Cottle <[e-mail]>
Subject: FW: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP

From: Coco, Nick A
Sent: Friday, June 30, 2023 9:58 AM
To: Lisa H. Cottle <[e-mail]>
Cc: Tharrington, Tom <[e-mail]>; Montebello, Michael J <[e-mail]>
Subject: RE: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP
Hi Lisa,
No worries! Thank you for verifying these data. I know it can be a time sink and a pain, but it's been really helpful for the
data review.
I've finished drafting the permit and wanted to discuss with you some limits being added to the permit based on data
from the last 4.5 years. During my data review, I conducted a reasonable potential analysis to assess reasonable
potential for excursions above state surface water standards. As a result of this analysis, limits for total copper (monthly
average of 31.9 µg/L and daily maximum of 45.2 µg/L) and total cyanide (monthly average of 7.5 µg/L and daily
maximum of 31.2 µg/L) are to be added to the permit. These new limits would also be accompanied by monthly
monitoring. I have summarized the data and reasonable potential analysis results in the table below. Upon request and
justification, Permittees may be granted Schedules of Compliance for newly added limits in their permits. If you wish to
have a compliance schedule, please let me know. If you believe that you will be able to achieve compliance with your
permit limits upon the effective date of the permit, we can skip the compliance schedule.
Parameter
Maximum Reported
Maximum Predicted
Allowable
RPA Analysis Decision
Concentration
Concentration
Discharge
Concentration
Total Copper
51.0 ug/L
105.06 ug/L
MA 31.9 ug/L
RP shown - apply Monthly
DM 45.2 ug/L
Monitoring with Limit
Total Cyanide
18.0 ug/L
27.4 ug/L
MA 7.5 ug/L
RP shown - apply Monthly
DM 31.2 ug/L
Monitoring with Limit
In addition to the RPA, I conducted an evaluation of low level mercury in accordance with the Statewide Mercury TMDL.
Since the annual average mercury concentration exceeded the WQBEL on two occasions, and two individual mercury
sample exceeded the TBEL, an annual average total mercury limit of 18 ng/L and quarterly monitoring has been added.
2019
2020
2021
2022
2023
# of Samples
1
4
4
4
2
Annual Average Conc. ng/L
88.4
5.2
4.7
3.47
39.18
Maximum Conc., ng/L
88.4
9.04
8.29
7.76
76.6
TBEL, ng/L
47
WQBEL, ng/L
18
I just wanted to make you aware of the changes and ask about the need for a compliance schedule. Please let me know
what the Town thinks when you get the chance.
Thanks,
Nick Coco, PE (he/him/his)
Engineer H/
NPDES Municipal Permitting Unit
NC DEQ / Division of Water Resources / Water Quality Permitting
Office: [phone]
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617

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NORTH CAROLINA 7.� Q
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
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From: Lisa H. Cottle <[e-mail]>
Sent: Friday, June 30, 2023 9:24 AM
To: Coco, Nick A <[e-mail]>
Cc: Tharrington, Tom <[e-mail]>
Subject: RE: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message
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Geez! Guess I need to slow down when typing in values! I will add these to my list of revisions!
• 10-9-19 Cu is 0.051 mg/L -see attached report
• 1-4-22 Cu is a typo. Should have been 0.013 mg/L. see attached report.
Lisa
From: Coco, Nick A <[e-mail]>
Sent: Thursday, June 29, 2023 2:54 PM
To: Lisa H. Cottle <[e-mail]>
Cc: Tharrington, Tom <[e-mail]>
Subject: RE: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP
Hi Lisa,
Thank you so much for the quick response on this additional information request.
I just have one more data verification request, this time for total copper. The two dates and reports in question are
10/9/19 - 51 ug/L and 1/4/2022 —130 ug/L.
I'm moving along through the drafting process and will let you know if anything else needs clarification, but should
hopefully be able to have a draft permit out to you sometime soon.
Thanks,
Nick Coco, PE (he/him/his)
Engineer ///
NPDES Municipal Permitting Unit
NC DEQ / Division of Water Resources / Water Quality Permitting
Office: [phone]
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617

DE
NORTH CAROLINA -
ti/)
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Lisa H. Cottle <[e-mail]>
Sent: Thursday, June 29, 2023 12:04 PM
To: Coco, Nick A <[e-mail]>
Cc: Tharrington, Tom <[e-mail]>; Moore, Cindy <[e-mail]>; Deamer, Nora
<[e-mail]>
Subject: [External] RE: Additional Information Request: NC0003450 Wallace Regional WWTP
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Nick,
Please see below for the information you requested. Please let me know if you have any more questions.
Lisa Cottle
Town of Wallace
Wastewater Treatment Supervisor
910-665-2091
[e-mail]
From: Coco, Nick A <[e-mail]>
Sent: Wednesday, June 28, 2023 4:33 PM
To: Lisa H. Cottle <[e-mail]>
Cc: Tharrington, Tom <[e-mail]>; Moore, Cindy <[e-mail]>; Deamer, Nora
<[e-mail]>
Subject: Additional Information Request: NC0003450 Wallace Regional WWTP
Hi Lisa,
I hope all is well.
I've begun working on the draft package for renewal of the Wallace Regional WWTP's NPDES permit NC0003450 and
was hoping you could provide the following information:

Please provide a brief narrative description of the treatment works. The influent flow from the Towns of
Wallace, Teachey, Greenevers and Burgaw go thru an automatic spiral barscreen. There is a manual back up
barscreen for when spiral screen is out of service for maintenance. The grit system is not operating but parts
have been ordered. Sampling is done after the grit removal then flow is pumped by 4 variable drive pumps to
the SBR basins. We have 3 SBR's but due to current level of flow and organic loading only 2 basins are in service.
Each basin has a floating mixer, decanter, 2 sludge pumps, and fine bubble diffusers. There are 5 blowers
providing the needed air to keep the DO in the SBR's in range. Treated water is decanter to a Post EQ which has
a floating aerator , before going to the Disk filters. We have 2 disk filters which have 12 disks, and 2 backwash
pumps each. The filter effluent then flow to the 2 UV channels which each contain 3 modules of 40 UV lamps.
The fully treated effluent is then pumped by the 4 viable speed drive pumps thru the force main to the outfall at
Rockfish Creek. The wasted sludge from the SBR's is pumped to the aerobic digestor which contains 3 floating
aerators, a floating decanter, and sludge transfer pump. Digested sludge is then moved to the 2 Sludge Holding
Tanks which each have a floating decanter and a sludge transfer pump. The sludge can be loaded onto tanker
trucks at the truck loading station.
• Please provide an update on the construction related to the PLC Upgrade and Grit Removal System Upgrade
slated for completion this month. The parts to replace the grit system have been ordered and I received the plan
submittals from Zima on 6-20-2023. 1 have not received an estimated date for delivery. The estimated date of
delivery for the PLC parts is December 2023. See attached schedules.
• Please provide a sludge management plan. To my knowledge, we do not have a written sludge management
plan. When the plant came on line in 2012, sludge was hauled off site by Triple S for injection after testing the
fecal count. Starting in September of 2022, Triple S was no longer able to inject our sludge and we began lime
stabilizing and following VAR option 6. Triple S still hauls our sludge off site to their farm in Beulaville. Triple
S thru Bob Branch(Branch Residuals & Soils, LLC) prepares and reports to the EPA the sludge report for us. If a
formal written plan is required, I will begin working on one.
Please verify the following data points reported in your eDMRs: See corrections below and the attached lab
reports. I will revise the eDMR's in the system as soon as possible. Downstream values can be found on the 2021
daily log under the September tab.
o Effluent:
■ 10/4/2022 Total Cadmium reported as non -detect < 0.48 ug/L. correct
■ 10/4/2022 Total Selenium reported as non -detect < 1 ug/L. typo- value should have been <0.01
mg/L (10 ug/L)
■ 7/14/2020 Total Zinc reported as detected at 510 ug/L typo- value should have been 0.051 mg/L
(51 ug/L)
■ 7/12/2021 Total Zinc reported as detected at 670 ug/L typo- value should have been 0.067 mg/L
(67 ug/L)
■ 1/4/2022 Total Zinc reported as detected at 680 ug/L typo- value should have been 0.068 mg/L
(68 ug/L)
o Downstream
9/20/21 Dissolved Oxygen reported as detected at 25 mg/L typo- DO value should have been
4.44 mg/L
9/21/21 Dissolved Oxygen reported as detected at 24 mg/L typo- DO value should have been
2.93 mg/L and temperature should have been 24
9/22/21 Dissolved Oxygen reported as detected at 24 mg/L typo- DO value should have been
3.58 mg/L and temperature should have been 24
It appears that no flow was reported for all aquatic toxicity tests in 2019 and the first half of 2020. Please
provide clarification and context, as WWTP effluent flow was reported during that duration. If this is incorrect,
please provide the results for these tests. The previous ORC Brent Dean (now our Public Services Director) had
been told (verbally or by email???) by some one at the state (maybe Dean Hunkele or Tom Tharrington????)
after we failed a toxicity test after Hurricane Matthew that we did not need to do the Quarterly toxicity testing
until we were no longer feeding chlorine, as we would most likely continue to fail it. During Hurricane Matthew
our UV system was flooded and unusable so our only means of disinfection was to feed liquid bleach to our post

EQ. Our target dosage was 1 ppm, however we had no way to ensure a 30 minute contact time and nowhere to
dechlorinate before discharging. When the same scenario happen with Hurricane Florence ( even though we
moved the controls for the UV to higher ground), and the UV system was not operable due to flooding of the UV
area, we once again feed liquid bleach to disinfect but did not dechlorinate prior to discharge. As soon as the
UV system was repaired each time we resumed our normal schedule of toxicity testing. I have contacted Brent
and he is searching again for the email , however his email format has changed and he could not find a copy of
that correspondence.
• Please provide the 3 Effluent Pollutant Scans. See attached lab reports. 3-27-19, 7-14-20, 4-6-21
Please verify where effluent sampling is conducted? Is this up at the plant or closer to the discharge location?
Originally the sampling was at the outfall at Rockfish Creek. After the flooding due to the hurricanes the
sampling point and the effluent flow meter, got moved to the plant at the effluent wet well.
As required by Session Law 2018-5, Senate Bill 99, Section 13.1(r), every applicant shall now submit
documentation of any additional pollutants for which there are certified methods with the permit application if
their discharge is anticipated. The list of pollutants may be found in 40 CFR Part 136, which is incorporated by
reference. If there are additional pollutants with certified methods to be reported, please submit the Chemical
Addendum to NPDES Application table with your application and, if applicable, list the selected certified
analytical method used. If no additional sampling was conducted and/or there are no additional pollutants to
report, please note as much on the form itself. This requirement applies to all NPDES facilities. The Chemical
Addendum to NPDES Application will be required for any type of facility with an NPDES permit, depending on
whether those types of pollutants are found in your wastewater. Please fill out, sign and submit the Chemical
Addendum to NPDES Application. See attached addendum. No other known pollutants were tested.
I appreciate your time and help on this. Please let me know if you have any questions regarding your permit renewal.
Thanks,
Nick Coco, PE (he/him/his)
Engineer ///
NPDES Municipal Permitting Unit
NC DEQ / Division of Water Resources / Water Quality Permitting
Office: [phone]
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
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