NC0021156_Fact Sheet_20240409

NC0021156
Fact Sheet
NPDES Permit No. NCO021156
Permit Writer/Email Contact Gary Perlmutter, [e-mail]
Date: April 9, 2024
Division/Branch: NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
N 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:
City of Mount Holly — Mount Holly WWTP
Applicant Address:
P.O. Box 406, Mount Holly NC 28120
Facility Address:
201 Broome St., Mount Holly NC 28120
Permitted Flow:
4.0 MGD
Facility Type/Waste:
MAJOR Municipal; 57% domestic, 43% industrial'
Facility Class:
Grade IV
Treatment Units:
Manual screen, Grit removal, EQ basin, Aeration, Clarification,
Chlorination, Dechlorination
Pretreatment Program (Y/N)
Yes
County:
Gaston
Region
Mooresville
'Based on permitted flows in Pretreatment Program Info Database sheet for Mount Holly.
Briefly describe the proposed permitting action and facility background: The City of Mount Holly has
applied for NPDES permit renewal and submitted a renewal application that was received by DWR on
March 14, 2023. Review of the application found it incomplete with the following elements missing:
• Three effluent pollutant scans
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NC0021156
• Two of the four 2nd species whole effluent toxicity test reports
• Process narrative
• Process flow diagram with water balances
• Sludge management plan
• Chemical Addendum.
These items were received upon request on 1/22 - 31/2024. The Effluent Pollutant Scans were sampled in
April 2021, June 2022 and August 2023; the second species tests were sampled in August 2020, December
2021, February 2022 and May 2023.
This facility serves a population of—18,000 residents and operates a pretreatment program with three
Significant Industrial Users (SIUs), all of which are categorical. The SIUs include: 1) American & Efird,
Inc. (CIU: 40 CFR 410 - textile), 2) Clariant Corporation (CIU: 40 CFR 414 - organic chemicals, and 40
CFR 455 - pesticides), and 3) Daimler Trucks North America (Mount Holly) (CIU: 40 CFR 413 -
electroplating),In addition, the WWTP receives wastewater from the Jadco-Hughes groundwater
remediation site and the Triangle Texaco groundwater remediation site.
A Nutrient Allocation Transfer Agreement between the City of Charlotte and the City of Mount Holly was
signed by city officials of each city and became effective on May 3, 2018. This agreement allows for the
transfer of nutrient (Total Nitrogen and Total Phosphorus) allocations from the City of Charlotte to the City
of Mount Holly WWTP for the period during which the City of Charlotte's Joe C. Stowe, Jr. Regional
Water Resources Reclamation Facility (Stowe WRRF; NC0089630) is undergoing construction, including
the connecting of the Mount Holly collection system to Stowe WRRF. Once the construction is complete,
all nutrient allocations will be transferred from Mount Holly WWTP to Stowe WRRF. As of this writing,
plans are for the Mount Holly WWTP to cease discharging by November 2024, and flow will be diverted
to Charlotte Water's McAlpine WWTP (NC0024970). As a result, the standard condition for facility closure
requirements will be added to the permit as a special condition. See Section 6: Other TMDL/Nutrient
Management Strategy Considerations for more details.
Inflow and Infiltration (I&I. The City reported an average I&I of > 20,000 gpd on the permit renewal
application. Steps taken to minimize I&I include: "Camera lines, smoke testing, line jetting, line cleaning,
line repairs, flow monitoring study in collection system. "
Sludge mana e ment. Waste sludge is sent to aerated holding tanks for vector reduction and pathogen
destruction, and lime stabilization. The tanks are frequently decanted, thickening the sludge to about 3%
concentration. This sludge is hauled by Synagro to farmers for land application under permit WQ0001863.
2. Receiving Waterbody Information
Mount Holly WWTP discharges into the Catawba River downstream of Mountain Island Lake, which has
a nominal year-round regulated release of 80 cfs. An adjusted control release of 95 cfs was determined by
adding the flow from the drainage area downstream of the dam (15 cfs).
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NC0021 l 56
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 - Catawba River
Stream Segment:
l l-(117)
Stream Classification:
WS-IV; CA
Drainage Area (mi2):
2015
Summer 7Q 10 (cfs)
95 (control release)
Winter 7Q 10 (cfs):
-
30Q2 (cfs):
716
Average Flow (cfs):
3016
IWC (% effluent):
6
2022 303(d) listed/parameter:
PCB Fish Tissue Advisory
Subject to TMDL/parameter:
Lake Wylie TMDL / nutrients (TN/TP). TP mass limits
effective January 2015, TN mass limits effective April 2017
due to Chlorophyll -a impairment. State-wide Mercury TMDL.
River basin/HUC:
Catawba / 03050101
USGS Topo Quad:
Mt. Holly, NC
The receiving water lies in the critical area of the Lake Wylie water supply watershed. The receiving water
also lies in the Lake Wylie Chlorophyll -a TMDL Management Area. The TMDL was approved by the
USEPA in 1996 to address eutrophication of the lake and its major tributaries along the Catawba River. See
Section 6: Water Quality Based Effluent Limitations for information regarding limits related to the water
supply watershed and TMDL.
3. Effluent Data Summary
Effluent data is summarized in Table 1 below for the period May 2019 through October 2023.
Table 1. Effluent Data Summary
PermitLimit
Parameter
Units
Average
Max
Min
1
Flow
MGD
2.223
7.141
0.991
MA = 4.0
Total Monthly Flow
MG/mo
67.690
87.100
53.032
Monitor &
Report
WA = 45.0
BOD5
mg/L
6.8
91.0
1.9
MA = 30.0
BOD removal
%
95.6
99.5
30.8
85
Total Suspended Solids
mg/L
11.6
160
< 2.5
WA = 45.0
(TSS)
MA = 30.0
TSS removal
%
92.0
98.8
9.1
85
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NCO021156
Parameter
Units
Average
Max
Min
PermitLimit 1
Ammonia (NH3-N)
mg/L
3.6
27.0
0.06
Monitor &
Report
Fecal Coliform
#/100 mL
12
4,839
< 1
WA = 400
(geometric mean)
MA = 200
Total Residual Chlorine
µg/L
31
49
2
DM = 28
Dissolved Oxygen (DO)
mg/L
5.6
10.0
0.082
DA > 5.0
Temperature
°C
22.3
33.0
11.0
Monitor &
Report
pH
SU
7.3
7.9
6.0
6.0 - 9.0
Total Kjeldahl Nitrogen
mg/L
5.0
36.0
< 0.1
Monitor &
(TKN)
Report
Nitrite + Nitrate
mg/L
4.9
48.0
< 0.02
Monitor &
(NO2-N + NO3-N)
Report
Total Nitrogen (TN)
mg/L
10.0
48.0
< 1.0
Monitor &
Report
TN Load
lb/mo
5,687
23,246
1,262
Monitor &
Report
TN Load summer
lb/summer
42,738
64,279
28,666
SM = 111,973
(Apr 1 - Oct 31)
TN Load winter
lb/winter
28,130
31,425
20,927
SM = 124,345
(Nov 1 - Mar 31)
Total Phosphorus (TP)
mg/L
2.5
12.0
< 0.1
Monitor &
Report
TP Load
lb/mo
1,376
3,299
141
Monitor &
Report
TP Load annual
lb/yr
16,341
22,479
11,967
YM = 31,405
(Jan 1- Dec 31)
Total Hardness
mg/L
39
56
16
Monitor &
Report
Footnotes.
1. MA = Monthly Average, WA = Weekly Average, DA = Daily Average, DM = Daily Maximum, SM = Season
Maximum, YM = Yearly Maximum.
2. DO minimum was due to a heavy rain event on 11/13/2020. Per the relevant month's DMR notes: "We were
out of compliance on DO because of the rain event that passed through that cause almost 3.5 inches of rain
within a 24hr period. "
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
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NC0021156
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 (DO), Temperature,
Conductivity, and Hardness (upstream only). Hardness is monitored for calculation of hardness -dependent
metal stream standards and is treated in Section 6.4 Reasonable Potential Analysis below. Instream
monitoring locations are at the NC Hwy 27 bridge (upstream) and just below the NC Hwy 29 / NC Hwy 74
bridge (downstream).
Permittee-submitted data from May 2019 through October 2023 reviewed and checked against applicable
stream standards as well as for effluent impacts, the latter via statistical testing of downstream averages
against the upstream average of each parameter using t-test with the level of significance (p-value) set at
0.05. The data are summarized in Tables 2 and discussed below.
Table 2. Instream Data Summary: averages with ranges in parentheses.
*Statistically significantly different from Upstream.
Parameter, units
Upstream
Downstream
Standard
DO, mg/L
Avg = 8.24
Avg = 8.30
5.0
(4.60—14.80)
(4.42—16.40)
Temperature, °C
Avg = 23.4
Avg = 23.9
32.0
(7.8 — 32.0)
(7.5 — 33.8)
Conductivity, µmhos/cm
Avg = 62.5
Avg = 59.9
NA
(45.6 — 165)
(44.6 — 96.5)
Dissolved Oxygen (DO) — DO is in the permit as a parameter of concern for aquatic life. Summer minima
of both stations were below the stream standard of 5.0 mg/L. No statistically significant difference was
found between upstream and downstream.
Temperature — Temperature is in the permit as a parameter of concern for aquatic life. The summer
maximum upstream is at the 32°C standard for lower piedmont and coastal plain waters, and the
downstream maximum is above it. No statistically significant differences were found between the upstream
and downstream stations. Seven instances of downstream temperatures were greater than the 2.8°C increase
standard (15A NCAC 02B .0208). Concurrent effluent temperatures appear lower on average; thus, the
effluent does not appear to be impacting the receiving stream.
Conductivity — Conductivity is in the permit as an indicator of industrial sources. The Town has an active
pretreatment program with three SIUs. A statistically significant difference was found between the
upstream and downstream stations with downstream average reporting lower. Effluent conductivity
monitoring is not required in the permit, and based on this difference, is likely not impacting the stream.
Nevertheless, because the facility is receiving industrial waste via a pretreatment program, effluent
conductivity monitoring will be added to the permit at daily frequency in accordance with 15A NCAC 02B
.0500.
Fecal Coliform — Fecal Coliform is not in the current permit as it was removed in 2002 based on permitting
guidance and instream data review, wherein similar counts between upstream and downstream samples
showed little or no correlation to the discharge. Effluent coliform count from May 2019 through October
2023 were mostly below limits with a geometric mean of 21/100 mL and four reported exceedences (see
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NCO021156
Section 5 Compliance Summary below). Because the receiving stream is neither a Class B nor impaired
for Fecal Coliform, instream Fecal Coliform is not required and was not added to the permit.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition: NA
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): From January 2019 through
December 2023 the facility had reported exceedances in Fecal Coliform, DO and TSS, resulting in various
enforcement actions (see Table 3).
Table 3. Effluent Monitoring Violations Summary.
Parameter
Exceedence
Number
Notices of
Notices of
Enforcement
Type
Exceedences
Deficiency
Violations
Cases
Fecal Coliform
Weekly
0
1
Geometric Mean
Fecal Coliform
Monthly
n
Geometric Mean
Dissolved Oxygen
Daily Minimum
3
Not Reached
Total Suspended Solids
Weekly Average
0
0
Total Suspended Solids
Monthly Average
1
0
1
0
Summarize the compliance record with aquatic toxicity test limits and any second species test results (past
5 years): The facility passed 16 of 16 quarterly chronic toxicity tests, as well as all 4 second species chronic
toxicity tests, collected 8/2/2020, 12/13/2021, 2/9/2022, 5/16/2023.
Summarize the results from the most recent compliance inspection: The most recent facility inspection,
conducted on February 15, 2023 reported no compliance issues. The most recent pretreatment inspection,
conducted on November 16, 2023, reported that the City's industrial pretreatment program was being
implemented properly.
6. Water Quality -Based Effluent Limitations (WQBELs)
6.1. Dilution and Mixing Zones
In accordance with 15A NCAC 213.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q 10 streamflow (acute Aquatic Life); 7Q 10 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): No.
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B.0204(b): NA.
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NC0021156
6.2. 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: NA.
6.3. Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia (NH3-N) chronic
criterion of 1.0 mg/L (summer) and 1.8 mg/L (winter). Acute NH3-N 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 µg/L) and capped at 28 µg/L (acute impacts). Due to analytical issues, all TRC values
reported below 50 µg/L are considered compliant with their permit limit.
Describe any proposed changes to NH3-N and/or TRC limits for this permit renewal: Currently the permit
has a 28 µg/L daily maximum limit for TRC and no limits for NH3-N. Both parameters were reviewed in
the attached NH3/TRC Wasteload Allocation (WLA) spreadsheet using the annual 7Q10 of 95 cfs. The
spreadsheet calculated a TRC allowable concentration capped at 28 µg/L, which will is maintained in the
permit as a limit.
The spreadsheet calculated NH3-N allowable concentrations of 13.0/26.0 mg/L summer/winter monthly
average. The calculated weekly average for both summer and winter is over 3 5. 0 mg/L for which monitoring
only is recommended. A review of submitted effluent data from May 2019 — October 2023 showed data to
be mostly below allowable concentrations (Fig. 1). Therefore, monthly average limits of 13.0 mg/L summer
and 26.0 mg/L winter and a year-round weekly average limit of 35 mg/L was added to the permit.
Ammonia - Proposed Limits
■ Wk Avg ■ Mo Avg WA Limit — — MA Limit
40
35
30
25
I {
E 20
15 Ar
10 ■ 5 *—
�A ■ •
2/4/2019 6/18/2020 10/31/2021 3/15/2023 7/27/2024
Figure 1. Effluent Ammonia -Nitrogen data against WLA-derived proposed limits.
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NC0021156
6.4. Reasonable Potential Analysis MA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of % detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
The current permit requires effluent and upstream Total Hardness monitoring for calculation of hardness -
dependent dissolved metals standards. The upstream hardness average is 21 mg/L, below the default of 25
mg/L with a maximum of 49 mg/L. Both effluent and upstream hardness data were entered into the RPA.
A reasonable potential analysis was conducted on effluent toxicant data collected between May 2019 —
October 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 Monitoriniz. 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:
o Total Copper: MA = 129 µg/L; DM = 141 µg/L
o Total Silver: MA = 0.98 µg/L; DM = 4.0 µg/L
• 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: Cyanide.
• 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: Antimony,
Arsenic, Beryllium, Cadmium, Total Chromium, Dichlorobromomethane, Lead, Molybdenum,
Nickel, Phenol, Selenium, Zinc.
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans sampled for in 04/2021,
06/2022, and 08/2023 were evaluated for additional pollutants of concern. Bromoform,
Chloroform, Dibromochloromethane were detected.
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.
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.
6.5. Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
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NC0021156
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 6%
effluent concentration is maintained at a quarterly monitoring frequency.
6.6. 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/L) 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/L) and/or if any individual value exceeds a TBEL value of 47 ng/L.
Table 4. Mercury Effluent Data Summary.
Parameter Y
2019
1 2020
1 2021
1 2022
1 2023
No. of Samples
3
3
4
2
3
Annual Average Conc. ng/L
2.0
18.7
5.9
1.0
2.2
Maximum Conc., ng/L
3.89
43.90
18.90
1.55
3.45
TBEL, ng/L
47
WQBEL, ng/L
193.9
Describe proposed permit actions based on mercury evaluation: The current permit has a MMP
requirement. Data collected since the permit modification were evaluated, yielding the same results: no
annual average mercury concentration exceeded the WQBEL, and no individual mercury sample exceeded
the TBEL (Table 4). Because the facility is greater than 2 MGD and has reported quantifiable levels of
mercury (> 1 ng/L), the Mercury Minimization Plan special condition is maintained.
6.7. Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: The permit currently contains effluent nutrient load limits to comply with the Lake Wylie
TMDL permitting strategy. The TMDL states that all facilities must meet a summer limit of 6 mg/L Total
Nitrogen (TN) and an annual limit of 1 mg/L Total Phosphorus (TP). These limits translate to base load
allocations of 64,200 lb/summer TN and 18,250 lb/yr TP for Mount Holly WWTP.
Related to the load limits are monthly monitoring requirements (including total monthly flow), and special
conditions for nutrient allocations, nutrient limits, and calculating nutrient loads. Current permit monitoring
for TN (including TKN and NO2+NO3) and TP concentrations on a weekly basis is consistent with 2010
Catawba River Basin Plan recommendations. Nutrient TMDL-related limits, monitoring requirements, and
special conditions were added via permit modification in January 2015.
A nutrient allocation transfer agreement between the City of Charlotte and City of Mount Holly became
effective on May 3, 2018. This agreement allows for a multi -step process of allocation transfers from three
WWTPs (Mount, Holly, Belmont and the former Clariant Corp. WWTPs) to the Stowe Regional Water
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NC0021156
Resource Recovery Facility (WRRF; permit NC0089630) under the Lake Wylie TMDL. The agreement
allows the City of Charlotte to transfer TN and TP load allocations from the Clariant Corp. WWTP to
Mount Holly WWTP and Belmont WWTP until the Stowe Regional WRRF and the connections from
Mount Holly and Belmont collection systems to it are constructed. After construction of the regional WRRF
and connections to it are made, all nutrient allocations will be transferred from Mount Holly and Belmont
WWTPs to the new plant. In light of this agreement, the current permit load allocations and limits include
allocations transferred from the former Clariant WWTP. The former Clariant load allocations were added
and the permit limits were revised in 2019.
The facility is on track to transfer its effluent to the Stowe Regional WRRF, with plans to cease discharge
by November 2024 (per ORC, 1/17/2024), after which time the City will request rescission of the permit.
No changes were made.
6.8. Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: A chemical addendum
was submitted upon request on 2/ 1 /2024, noting that no additional pollutants was anticipated in the effluent.
The emerging contaminants 1,4-Dioxane and PFAS chemical group were considered for potential
requirements. Neither was included in the submitted chemical addendum. The outfall discharges into WS-
IV waters, and the facility receives industrial waste via a Division -approved pretreatment program. The
pretreatment program's three Significant Industrial Users (SIU's) are in categories recognized as potential
sources for both 1,4-Dioxane and PFAS. Therefore, quarterly monitoring for both parameter types has been
added to the permit. For 1,4-Dioxane, a permit re -opener special condition was also added to the permit.
For PFAS, monitoring was added with a delayed implementation. See details in Section 10. Monitoring
Requirements below.
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: Yes. A three-year compliance
schedule for Total Silver with the alternative of discharge elimination has been added to the permit.
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B.0226 for this permit renewal: NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals if not applicable, delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/L
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 BODS/TSS included in the permit? YES. Review of submitted data
found 54 and 97 instances of < 85% removal of BOD and TSS, respectively.
If NO, provide a justification (e.g., waste stabilization pond). NA
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NCO021156
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit must
document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all cases,
existing instream water uses and the level of water quality necessary to protect the existing use is maintained
and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA
9. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): No.
If YES, confirm that antibacksliding provisions are not violated: NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following regulations
and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 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.
No parameters have reduced monitoring frequencies.
To identify PFAS concentrations in waters classified as Water Supply (WS) waters, monitoring
requirements are to be implemented in NPDES permits with pretreatment programs that discharge to WS
waters. Since the WWTP's outfall discharges into a WS-IV water and as the WWTP receives wastewater
from industries recognized as potential sources of PFAS via a pretreatment program, monitoring of PFAS
chemicals has been added to the permit. Currently, EPA Method 1633 is finalized (as of January 31, 2024)
but not yet published in the Federal Register as an approved test method. Upon evaluation of laboratory
availability and capability to perform the analytical method, it was determined that the sampling may be
conducted using the 3rd draft method or more recent version of Method 1633. Effluent quarterly monitoring
has been added to the permit with analysis using the method until Method 1633 becomes approved via
publication in the Federal Register. Sampling using the method shall take effect the first full calendar
quarter following 6 months after the effective date of the permit to provide the City time to select a
laboratory, develop a contract, and begin collecting samples. Data shall submit data to the Division via a
Page 11 of 15

NC0021156
spreadsheet provided by the Division. Effective 6 months after Method 1633 is published in the Federal
Register as part of 40 CFR 136, the City shall conduct effluent monitoring using the approved method and
submit data via eDMR.
In addition to monitoring at the WWTP, the City shall identify and monitor SIUs suspected of discharging
PFAS compounds [see A.(8.)(c.)(i.)] within 6 months of the permit effective date. The City shall update
their Industrial Waste Survey (IWS) to identify indirect dischargers of PFAS contributing to concentrations
experienced at the Mount Holly WWTP. A summary of information learned during this process will be
provided as part of the 2024 Pretreatment Annual Report (PAR). Within 6 months of completion of the
IWS, the City shall begin sampling of indirect dischargers identified as potential PFAS sources at a
quarterly frequency. For a detailed outline of the specific PFAS requirements, see Special Condition A.(10.)
PFAS Monitoring Requirements.
For instream monitoring, refer to Section 4
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. Effective December 21, 2020, NPDES regulated facilities will be required to submit
additional NPDES reports electronically. This permit contains the requirements for electronic reporting,
consistent with Federal requirements.
12. Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 4.0 MGD
No change
15A NCAC 2B .0505
Required to calculate monthly based
Total Monthly Flow
Monitor monthly
No change
TN/TP nutrient mass limits compliance
(MG/mo)
with Lake Wylie TMDL permitting
strategy.
MA 30.0 mg/L
TBEL. Secondary treatment standards /
BOD5
WA 45.0 mg/L
No change
40 CFR 133 / 15A NCAC 2B .0406,
Monitor daily
.0508
Total Suspended
MA 30.0 mg/L
WA 45.0 mg/L
No change
TBEL. Secondary treatment standards /
Solids (TSS)
Monitor daily
40 CFR 133 / 15A NCAC 2B .0406.
Summer:
MA = 13.0 mg/L
WA = 35.0 mg/L
WQBEL. WLA-calculated allowable
Ammonia
Monitor 3/week
Winter:
concentrations to protect against
(NH3-N)
MA — 26.0 mg/L
ammonia toxicity. Monitoring
WA = 35.0 mg/L
frequencylSA NCAC 2B .0505
No change in monitoring.
Page 12 of 15

NC0021156
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Fecal Coliform
MA 200 /100 mL
WA 400 A 00 mL
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 213.0200.
Total Residual
DM 28 µg/L
No change
WQBEL. State WQ standard, 15A
Chlorine (TRC)
Monitor daily
NCAC 213.0200.
Dissolved Oxygen
DA > 5 mg/L
No change
WQBEL. State WQ standard, 15A
(DO)
Monitor daily
NCAC 213.0200.
Temperature (°C)
Monitor daily
No change
15A NCAC 213.0508
pH
6.0 — 9.0 SU
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 213.0200.
Instream monitoring
Add daily effluent
Facility receives industrial waste via
Conductivity
only
monitoring
pretreatment program; 15A NCAC 02B
.0508.
Monitor quarterly
Revised water quality standards and
Total Hardness
effluent and instream,
No change
EPA's guidance on hardness -dependent
upstream of discharge
metals.
Total Copper
No requirement
MA = 129 µg/L
DM = 141 µg/L
WQBEL. Reasonable potential to
Monitor monthly
exceed stream standards (RP) found.
Total Cyanide
No requirement
Add quarterly monitoring
No RP found; max. predicted value >
50 /o of allowable concentration.
MA = 0.98 µg/L
DM = 4.0 µg/L
Total Silver
No requirement
Monitor monthly
WQBEL. Reasonable potential to
Add 3-yr compliance
exceed stream standards (RP) found.
schedule with alternative
to eliminate discharge
Total Mercury
MMP Special Condition
No change
Statewide Mercury TMDL
Required to monitor N species and to
calculate TN load for limit compliance
Total Kjeldahl
Monitor Weekly
No change
per Lake Wylie TMDL permitting
Nitrogen (TKN)
strategy, and to comply with NC
Chlorophyll -a WQS. 15A NCAC
213.0200.
Required to monitor N species and to
calculate TN load for limit compliance
Nitrite + Nitrate
Monitor Weekly
No change
per Lake Wylie TMDL permitting
(NO2-N + NO3-N)
strategy, and to comply with NC
Chlorophyll -a WQS. 15A NCAC
213.0200.
Required to monitor N species and to
Total Nitrogen (TN)
calculate TN load for limit compliance
(=TKN +
Monitor Weekly
No change
per Lake Wylie TMDL permitting
NO2-N + NO3-N)
strategy, and to comply with NC
Chlorophyll -a WQS. 15A NCAC
213.0200.
Page 13 of 15

NCO021156
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
WQBEL. Required TN mass allocation
Summer 111,973 lb
per Lake Wylie TMDL permitting
TN Load
Winter 124,345 lb
No change
strategy. Nutrient allocation transfer
Monitor Monthly
from Clariant Corp. by City of Charlotte
to Mount Holly per agreement,
5/3/2018.
Required to calculate TP load for limit
Total Phosphorus
compliance per Lake Wylie TMDL
(TP)
Monitor Weekly
No change
permitting strategy, and to comply with
NC Chlorophyll -a WQS. 15A NCAC
213.0200.
WQBEL. Required TP allocation per
YM 31,405 lb/yr
Lake Wylie TMDL permitting strategy.
TP Load
Monitor Monthly
No change
Nutrient allocation transfer from
Clariant Corp. by City of Charlotte to
Mount Holly per agreement, 5/3/2018.
Facility discharges into a WS-IV water
1,4-Dioxane
No requirement
Add quarterly monitoring
and receives wastewater from industries
and reopener condition
recognized as potential 1,4-Dioxane
sources.
Add quarterly monitoring
Facility discharges into a WS-IV water
PFAS
No requirement
with implementation
and receives wastewater from industries
schedule
recognized as potential PFAS sources.
Chronic limit, 6%
WQBEL. No toxics in toxic amounts.
Toxicity Test
effluent
No change
15A NCAC 213.0200 and 15A NCAC
Monitor quarterly
213.0500.
Effluent Pollutant
Three times per permit
Update sample years to
40 CFR 122
Scan
cycle
2026, 2027, 2028
Electronic Reporting
Special Condition
Update Special Condition
In accordance with EPA Electronic
Reporting Rule 2015.
Facility Closure
Standard Condition
Add as Special Condition
Facility is planning closure within
permit term.
MGD = Million gallons per day, MA = Monthly Average, WA = Weekly Average, DM = Daily
Maximum, DA = Daily Average, SM = Seasonal Maximum. YM = Yearly Maximum.
13. Public Notice Schedule:
Permit to Public Notice: 02/22/2024
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-day comment period indicating the interest of the parry filing such request and the reasons
why a hearing is warranted.
Page 14 of 15

NC0021156
14. NPDES Division Contact:
If you have questions regarding any of the above information or on the attached permit, please contact Gary
Perlmutter at [phone] or via email at gary_perlmutterkdeq.nc.gov.
15. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): Copies of the draft
permit and fact sheet were distributed to the Permittee, EPA, and various internal DWR parties. No
comments were received by any party.
If Yes, list changes and their basis below: NA
16. Fact Sheet Attachments (if applicable):
• Three (3) Effluent Pollutant Scans, Apr 2021, Jun 2022, Aug 2023
• Two (2) 2nd species toxicity test reports, Feb 2022 and May 2023
• Process flow narrative
• Process flow diagram
• Sludge Management Plan
• Chemical Addendum
• Pretreatment POC form
• NC Final 2022 303(d) list, p. 27
• Monitoring Violations Report
• WET test summary, p. 60
• Facility Compliance Inspection Report, 02/15/2023
• Pretreatment Compliance Inspection Report, 1/16/2023
• NH3/TRC WLA Calculation sheet
• RPA Spreadsheet Summary
• RPA Dissolved Metals Calculator sheet
• Dissolved Metals Fact Sheet Memo
• Mercury TMDL Evaluation data and summary table
Page 15 of 15

0
aceAnalytical
Report of Analysis
City of Mount Holly
PO Box 406
Mount Holly, NC 28120
Attention: Doug Shoutd
Project Name: Effluent Pollutant Scan
Lot Number:WC19061
Date Completed:04/01/2021
04/01/2021 1:49 PM
Approved and released by:
Project Manager I: Hannah K. Lucas
PCCRFO
24r
ANSI National Accreditation Board
qe0
A C C R E D I T E D
TESTING LABORATORY
The electronic signature above is the equivalent of a handwritten signature.
This report shall not be reproduced, except in its entirety, without the written approval of Pace Analytical Services, LLC.
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172
Tel:[phone] Fax:[phone] www.pacelabs.com
Page 1 of 13

PACE ANALYTICAL SERVICES, LLC
SC DHEC No: 32010001 NELAC No: E87653 NC DENR No: 329 NC Field Parameters No: 5639
Case Narrative
City of Mount Holly
Lot Number: WC19061
This Report of Analysis contains the analytical result(s) for the sample(s) listed on the Sample Summary
following this Case Narrative. The sample receiving date is documented in the header information
associated with each sample.
All results listed in this report relate only to the samples that are contained within this report.
Sample receipt, sample analysis, and data review have been performed in accordance with the most
current approved The NELAC Institute (TNI) standards, the Pace Analytical Services, LLC ("Pace")
Laboratory Quality Manual, standard operating procedures (SOPS), and Pace policies. Any exceptions to
the TNI standards, the Laboratory Quality Manual, SOPS or policies are qualified on the results page or
discussed below.
If you have any questions regarding this report please contact the Pace Project Manager listed on the
cover page.
Semivolatiles
Sample -001 was diluted 10X due to the sample matrix. The reporting limit has been raised
accordingly.
Inorganic non-metals
The method blank associated with batch 86963 had HEM (oil and grease) detected at a concentration
that was above the LOQ. There were no detections for this compound in the samples associated with
this method blank, negating the possibility of false positives or sample contamination.
Pace Analytical Services, LLC (formerly Shealy Environmetal Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 2 of 13

PACE ANALYTICAL SERVICES, LLC
Sample Summary
City of Mount Holly
Lot Number: WC19061
Sample Number Sample ID Matrix Date Sampled Date Received
001 Effluent Aqueous 03/19/20210805 03/19/2021
002 Effluent Aqueous 03/19/20210805 03/19/2021
(2 samples)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 3 of 13

PACE ANALYTICAL SERVICES, LLC
Detection Summary
City of Mount Holly
Lot Number: WC19061
Sample Sample ID
Matrix
Parameter
Method
Result Q
Units
Page
001
Effluent
Aqueous
Ammonia - N (gas
350.1
9.7
mg/L
5
001
Effluent
Aqueous
Hardness (total)
SM 2340C-
42
mg/L
5
001
Effluent
Aqueous
Nitrate -Nitrite - N
353.2
0.27
mg/L
5
001
Effluent
Aqueous
Phosphorus
365.1
1.7
mg/L
5
001
Effluent
Aqueous
TDS
SM 2540C-
380
mg/L
5
001
Effluent
Aqueous
TKN
351.2
13
mg/L
5
001
Effluent
Aqueous
Antimony
200.8
0.0075
mg/L
8
001
Effluent
Aqueous
Chromium
200.8
0.0078
mg/L
8
001
Effluent
Aqueous
Copper
200.8
0.011
mg/L
8
001
Effluent
Aqueous
Zinc
200.8
0.02
mg/L
8
002
Effluent
Aqueous
Chloroform
624.1
1.1
ug/L
10
(11 detections)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 4 of 13

Inorganic non-metals
Client: City of Mount Holly Laboratory ID:WC19061-001
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run Prep Method
Analytical Method
Dilution
Analysis Date Analyst
Prep Date
Batch
1 350.1
(Ammonia - N ) 350.1
2
03/25/2021 1128 KFE
86803
1
(Hardness (to) SM 2340C-2011
1
03/31/2021 1425 DAK
87512
1
(Nitrate-Nitr) 353.2
1
03/25/2021 2141 AAB
86922
2
(Phosphorus) 365.1
1
03/30/2021 1404 DMA
87209
1
(TDS) SM 2540C-2011
1
03/24/2021 2013 SJL
86640
1 351.4
(TKN) 351.2
5
03/30/2021 1912 DMA
03/26/2021 1656 87034
CAS Analytical
Parameter
Number Method
Result Q
LOQ
Units
Run
Ammonia - N (gas diffusion)
350.1
9.7
0.20
mg/L
1
Hardness (total)
SM 2340C-2011
42
10
mg/L
1
Nitrate -Nitrite - N
353.2
0.27
0.020
mg/L
1
Phosphorus
7723-14-0 365.1
1.7
0.050
mg/L
2
TDS
SM 2540C-2011
380
25
mg/L
1
TKN
351.2
13
0.50
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure
NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure
H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 5 of 13

Semivolatile Organic Compounds by GC/MS
Client: City of Mount Holly Laboratory ID:WC19061-001
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run Prep Method Analytical Method
Dilution Analysis Date Analyst
Prep Date
Batch
1 625.1 625.1
10 03/27/2021 2038 SCD
03/22/2021 1625 86467
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acenaphthene
83-32-9
625.1
ND
16
ug/L
1
Acenaphthylene
208-96-8
625.1
ND
16
ug/L
1
Anthracene
120-12-7
625.1
ND
16
ug/L
1
Benzidine
92-87-5
625.1
ND
80
ug/L
1
Benzo(a)anthracene
56-55-3
625.1
ND
16
ug/L
1
Benzo(a)pyrene
50-32-8
625.1
ND
16
ug/L
1
Benzo(b)fluoranthene
205-99-2
625.1
ND
16
ug/L
1
Benzo(g,h,i)perylene
191-24-2
625.1
ND
16
ug/L
1
Benzo(k)fluoranthene
207-08-9
625.1
ND
16
ug/L
1
4-Bromophenyl phenyl ether
101-55-3
625.1
ND
16
ug/L
1
Butyl benzyl phthalate
85-68-7
625.1
ND
16
ug/L
1
bis (2-Chloro-1-methylethyl) ether
108-60-1
625.1
ND
16
ug/L
1
4-Chloro-3-methyl phenol
59-50-7
625.1
ND
16
ug/L
1
bis(2-Chloroethoxy)methane
111-91-1
625.1
ND
16
ug/L
1
bis(2-Chloroethyl)ether
111-44-4
625.1
ND
16
ug/L
1
2-Chloronaphthalene
91-58-7
625.1
ND
16
ug/L
1
2-Chlorophenol
95-57-8
625.1
ND
16
ug/L
1
4-Chlorophenyl phenyl ether
7005-72-3
625.1
ND
16
ug/L
1
Chrysene
218-01-9
625.1
ND
16
ug/L
1
Dibenzo(a,h)anthracene
53-70-3
625.1
ND
16
ug/L
1
3,3'-Dichlorobenzidine
91-94-1
625.1
ND
80
ug/L
1
2,4-Dichlorophenol
120-83-2
625.1
ND
16
ug/L
1
Diethylphthalate
84-66-2
625.1
ND
16
ug/L
1
Dimethyl phthalate
131-11-3
625.1
ND
16
ug/L
1
2,4-Dimethylphenol
105-67-9
625.1
ND
16
ug/L
1
Di-n-butyl phthalate
84-74-2
625.1
ND
16
ug/L
1
4,6-Dinitro-2-methylphenol
534-52-1
625.1
ND
80
ug/L
1
2,4-Dinitrophenol
51-28-5
625.1
ND
80
ug/L
1
2,4-Dinitrotoluene
121-14-2
625.1
ND
32
ug/L
1
2,6-Dinitrotoluene
606-20-2
625.1
ND
32
ug/L
1
Di-n-octylphthalate
117-84-0
625.1
ND
16
ug/L
1
1,2-Diphenylhydrazine(as azobenzene)
103-33-3
625.1
ND
16
ug/L
1
bis(2-Ethylhexyl)phthalate
117-81-7
625.1
ND
80
ug/L
1
Fluoranthene
206-44-0
625.1
ND
16
ug/L
1
Fluorene
86-73-7
625.1
ND
16
ug/L
1
Hexachlorobenzene
118-74-1
625.1
ND
16
ug/L
1
Hexachlorobutadiene
87-68-3
625.1
ND
16
ug/L
1
Hexachlorocyclopentadiene
77-47-4
625.1
ND
80
ug/L
1
Hexachloroethane
67-72-1
625.1
ND
16
ug/L
1
Indeno(1,2,3-c,d)pyrene
193-39-5
625.1
ND
16
ug/L
1
Isophorone
78-59-1
625.1
ND
16
ug/L
1
Naphthalene
91-20-3
625.1
ND
16
ug/L
1
Nitrobenzene
98-95-3
625.1
ND
16
ug/L
1
2-Nitrophenol
88-75-5
625.1
ND
32
ug/L
1
LOQ = Limit of Quantitation B = Detected in the method blank
E = Quantitation of
compound exceeded the calibration range
Q = Surrogate failure
NO = Not detected at or above the LOQ N = Recovery is out of criteria
P = The RPD between two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W = Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 6 of 13

Semivolatile Organic Compounds by GC/MS
Client: City of Mount Holly Laboratory ID:WC19061-001
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 625.1 625.1 10 03/27/2021 2038 SCD 03/22/2021 1625 86467
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
4-Nitrophenol
100-02-7
625.1
ND
80
ug/L
1
N-Nitrosodimethylamine
62-75-9
625.1
ND
16
ug/L
1
N-Nitrosodi-n-propylamine
621-64-7
625.1
ND
16
ug/L
1
N-Nitrosodiphenylamine (Diphenylamine)
86-30-6
625.1
ND
16
ug/L
1
Pentachlorophenol
87-86-5
625.1
ND
80
ug/L
1
Phenanthrene
85-01-8
625.1
ND
16
ug/L
1
Phenol
108-95-2
625.1
ND
16
ug/L
1
Pyrene
129-00-0
625.1
ND
16
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
625.1
ND
16
ug/L
1
2,4,6-Trichlorophenol
88-06-2
625.1
ND
16
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery Limits
2-Fluorobiphenyl
77 37-129
2-Fluorophenol
37 24-127
Nitrobenzene-d5
64 38-127
Phenol-d5
44 28-128
Terphenyl-d14
73 10-148
2,4,6-Tribromophenol
81 41-144
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 %
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
Page 7 of 13

ICP-MS
Client: City of Mount Holly Laboratory ID:WC19061-001
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run
Prep Method
Analytical Method
Dilution Analysis Date Analyst
Prep Date Batch
1
200.2
200.8
1 03/23/2021 1841 BNW
03/23/2021 0307 86384
2
200.2
200.8
1 03/26/2021 1645 BPK
03/23/2021 0307 86384
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
Antimony
7440-36-0
200.8
0.0075
0.0050
mg/L
1
Arsenic
7440-38-2
200.8
ND
0.0020
mg/L
1
Beryllium
7440-41-7
200.8
ND
0.0010
mg/L
1
Cadmium
7440-43-9
200.8
ND
0.00050
mg/L
1
Chromium
7440-47-3
200.8
0.0078
0.0050
mg/L
1
Copper
7440-50-8
200.8
0.011
0.0020
mg/L
1
Lead
7439-92-1
200.8
ND
0.0020
mg/L
2
Nickel
7440-02-0
200.8
ND
0.0020
mg/L
1
Selenium
7782-49-2
200.8
ND
0.0050
mg/L
1
Silver
7440-22-4
200.8
ND
0.0010
mg/L
1
Thallium
7440-28-0
200.8
ND
0.0020
mg/L
1
Zinc
7440-66-6
200.8
0.020
0.010
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 8 of 13
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure

Inorganic non-metals
Client: City of Mount Holly Laboratory ID:WC19061-002
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run Prep Method
Analytical Method Dilution
Analysis Date Analyst Prep Date
Batch
1
(Cyanide - To) Kelada-01 1
03/25/2021 1844 DMA
86880
1
(Phenolics) 420.4 1
03/24/2021 1747 DMA
86741
1
(HEM (oil and) 1664B 1
03/26/2021 0940 KIB
86963
Parameter
Cyanide - Total
Phenolics
HEM (oil and grease)
CAS Analytical
Number Method Result Q LOQ Units Run
57-12-5 Kelada-01 ND
420.4 ND
1664B ND
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
0.010 mg/L 1
0.0050 mg/L 1
5.0 mg/L 1
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
Page 9 of 13

Volatile Organic Compounds by GC/MS
Client: City of Mount Holly Laboratory ID:WC19061-002
Description: Effluent Matrix: Aqueous
Date Sampled:03/19/2021 0805
Date Received:03/19/2021
Run Prep Method
Analytical Method Dilution Analysis Date Analyst
Prep Date
Batch
1 624.1
624.1 1 03/26/20212108 DJG
87075
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acrolein
107-02-8
624.1
ND
5.0
ug/L
1
Acrylonitrile
107-13-1
624.1
ND
5.0
ug/L
1
Benzene
71-43-2
624.1
ND
1.0
ug/L
1
Bromodichloromethane
75-27-4
624.1
ND
1.0
ug/L
1
Bromoform
75-25-2
624.1
ND
1.0
ug/L
1
Bromomethane (Methyl bromide)
74-83-9
624.1
ND
2.0
ug/L
1
Carbon tetrachloride
56-23-5
624.1
ND
1.0
ug/L
1
Chlorobenzene
108-90-7
624.1
ND
1.0
ug/L
1
Chloroethane
75-00-3
624.1
ND
2.0
ug/L
1
2-Chloroethylvinylether
110-75-8
624.1
ND
5.0
ug/L
1
Chloroform
67-66-3
624.1
1.1
1.0
ug/L
1
Chloromethane (Methyl chloride)
74-87-3
624.1
ND
2.0
ug/L
1
Dibromochloromethane
124-48-1
624.1
ND
1.0
ug/L
1
1,2-Dichlorobenzene
95-50-1
624.1
ND
1.0
ug/L
1
1,3-Dichlorobenzene
541-73-1
624.1
ND
1.0
ug/L
1
1,4-Dichlorobenzene
106-46-7
624.1
ND
1.0
ug/L
1
Dichlorodifluoromethane
75-71-8
624.1
ND
2.0
ug/L
1
1,1-Dichloroethane
75-34-3
624.1
ND
1.0
ug/L
1
1,2-Dichloroethane
107-06-2
624.1
ND
1.0
ug/L
1
1,1-Dichloroethene
75-35-4
624.1
ND
1.0
ug/L
1
cis- 1,2-Dichloroethene
156-59-2
624.1
ND
1.0
ug/L
1
trans- 1,2-Dichloroethene
156-60-5
624.1
ND
1.0
ug/L
1
1,2-Dichloropropane
78-87-5
624.1
ND
1.0
ug/L
1
cis- 1,3-Dichloropropene
10061-01-5
624.1
ND
1.0
ug/L
1
trans- 1,3-Dichloropropene
10061-02-6
624.1
ND
1.0
ug/L
1
Ethylbenzene
100-41-4
624.1
ND
1.0
ug/L
1
Methylene chloride
75-09-2
624.1
ND
1.0
ug/L
1
1,1,2,2-Tetrachloroethane
79-34-5
624.1
ND
1.0
ug/L
1
Tetrachloroethene
127-18-4
624.1
ND
1.0
ug/L
1
Toluene
108-88-3
624.1
ND
1.0
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
624.1
ND
1.0
ug/L
1
1,1,1-Trichloroethane
71-55-6
624.1
ND
1.0
ug/L
1
1,1,2-Trichloroethane
79-00-5
624.1
ND
1.0
ug/L
1
Trichloroethene
79-01-6
624.1
ND
1.0
ug/L
1
Trichlorofluoromethane
75-69-4
624.1
ND
1.0
ug/L
1
Vinyl chloride
75-01-4
624.1
ND
1.0
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery Limits
Bromofluorobenzene
100 70-130
1,2-Dichloroethane-d4
99 70-130
Toluene-d8
107 70-130
LOQ = Limit of Quantitation B =
Detected in the method blank E = Quantitation of compound exceeded the calibration range
Q = Surrogate failure
NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between
two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W
= Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 10 of 13

Chain of Custody
and
Miscellaneous Documents
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 11 of 13

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Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 12 of 13

PACE ANALYTICAL SERVICES, LLC
Clicric MOON I M
Mcans ofreceipt
Yes f NoYes ?Vo
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IS, tUi-Ia AutFor'ty: Pace EKV - U=L
Sample Receipt Cheekhst (. )
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5- Wm proper cuswdy prnucdurcs (re1ir u:shedlmidived) FolirnoMI?
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7, Werr simple tDs listed or. al l &Yn Je contnitu r ?
8_ W4S CORD. -ion dzti & Omc likes: an the C O C?
`9. Wass uo1ludoll daie & Lime listed -an all aumrle canteiners? LM-r,cxvIAME raa&IFRUMCUWAINm
10. Did all information (ID, [sale, Brno) agree with Ihea C'OU?
I I . W= trysts rfarmed JLsted on Ue COM
17, T?id ri]1 samtPlc.g arrive =, 1he pTaper comalner:. for each tort andlnr in ZaQrl coriditicu:
(wibruken, IW on, etc_)? --
13, Was adequate saitt le vu lam r ama ilable?
_ [4-_ Were Ell ctm pJes recejv-d with ii'A he hald;ngtime are 3 hours, svnictever crrcnez first?
IS. Were ark' �amplcs runtainers missir +excess(Girc:a ono) samples Not listed a;1 CC)C? --
lG. For VOA and UK-175 sainplesN w in dlamtcr)
io any afthe VOA vials?
TNA 17. Were all DROAuen'Onutrient samples rwr-Fved at a pl l of r 2?
NA 18. Were all cyarttde nampla received at a pH = 12 and sllilfidr, samples reokE vt!d at a pFl > 9?
]NA I9_ Were al: 4Ep icable NK 1c}ariice/phenoV6�#_ I r 08-.a (< 0.5m&1) mrr plr.y ee o
residual. Chlorine?
NA 0, 'Wom cIiEnr remarkslrequests (Le. rcgtioated dJlut ons, WN1Sa dcsiLw;ifialis, etc---)
ue,rrudly Vmmeribtxd From tit'e COC into the com_ueiTtSColinn in UNIX?
2J, Was be 91.10tenumber Ester] nn the container :al]Gi$1C}es. QUXC P-
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ware reawivrd incorrectly preserved Luna] wv.re adjusD 4 4t=cordiugly
vidl KA _ LL Dfdrele o7c: F2SCK iFN03, HCI, NaOI I using Sly 9 NA
NA lfrr,OM Um one is needed, pleme note it Om cornmer.is be rove.
wemmr civcd,hirlihuhhlas>Glnu>Ii,icJi,HMCI.er.
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Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 13 of 13

0
aceAnalytical
Report of Analysis
City of Mount Holly
PO Box 406
Mount Holly, NC 28120
Attention: Doug Shoutd
Project Name: Effluent Pollutant Scan
Lot Number:XE05108
Date Completed:06/03/2022
06/06/2022 8:41 AM
Approved and released by:
Project Manager II: Edward Barnett
PCCRFO
24r
ANSI National Accreditation Board
qe0
A C C R E D I T E D
TESTING LABORATORY
The electronic signature above is the equivalent of a handwritten signature.
This report shall not be reproduced, except in its entirety, without the written approval of Pace Analytical Services, LLC.
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172
Tel:[phone] Fax:[phone] www.pacelabs.com
Page 1 of 23

PACE ANALYTICAL SERVICES, LLC
SC DHEC No: 32010001 NELAC No: E87653 NC DENR No: 329 NC Field Parameters No: 5639
Case Narrative
City of Mount Holly
Lot Number: XE05108
This Report of Analysis contains the analytical result(s) for the sample(s) listed on the Sample Summary
following this Case Narrative. The sample receiving date is documented in the header information
associated with each sample.
All results listed in this report relate only to the samples that are contained within this report. Where
sampling is conducted by the client, results relate to the accuracy of the information provided, and as the
samples are received.
Sample receipt, sample analysis, and data review have been performed in accordance with the most
current approved The NELAC Institute (TNI) standards, the Pace Analytical Services, LLC ("Pace")
Laboratory Quality Manual, standard operating procedures (SOPS), and Pace policies. Any exceptions to
the TNI standards, the Laboratory Quality Manual, SOPS or policies are qualified on the results page or
discussed below.
Pace is a TNI accredited laboratory; however, the following analyses are currently not listed on our TNI
scope of accreditation: Drinking Water: VOC (excluding BTEX, MTBE, Naphthalene, & 1,2-
dichloroethane) EPA 524.2, E. coli and Total coliforms SM 9223 B-2004, Solid Chemical Material: TOC
Walkley-Black, Biological Tissue: All, Non -Potable Water: SGT-HEM EPA 1664B, Silica EPA 200.7,
Boron, Calcium, Silicon, Strontium EPA 200.8, Bicarbonate, Carbonate, and Hydroxide Alkalinity SM 2320
B-2011, SM 9221 C E-2006 & SM 9222D-2006, Strontium SW-846 6010D, VOC SM 6200 B-2011, Fecal
Coliform Colilert-18.
If you have any questions regarding this report, please contact the Pace Project Manager listed on the
cover page.
SVOCs
The following sample was diluted due to the nature of the sample matrix: XE05108-001. The LOQ has
been elevated to reflect the dilution.
VOCs
Insufficient sample volume was provided to perform matrix spike/matrix spike duplicate (MS/MSD) for
analytical batch 42357. An LCS/LCSD was run in lieu of an MS/MSD.
Subcontracted Data
Cyanide analysis was subcontracted to Pace Gulf Coast, LA. The results are included after the Pace
report of analysis.
Pace Analytical Services, LLC (formerly Shealy Environmetal Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 2 of 23

PACE ANALYTICAL SERVICES, LLC
Sample Summary
City of Mount Holly
Lot Number: XE05108
Sample Number Sample ID Matrix Date Sampled Date Received
001 Effluent Aqueous 05/05/2022 0805 05/05/2022
002 Effluent Aqueous 05/05/2022 0807 05/05/2022
(2 samples)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 3 of 23

PACE ANALYTICAL SERVICES, LLC
Detection Summary
City of Mount Holly
Lot Number: XE05108
Sample Sample ID
Matrix
Parameter
Method
Result Q
Units
Page
001
Effluent
Aqueous
Ammonia - N (gas
350.1
0.14
mg/L
5
001
Effluent
Aqueous
Hardness (total)
SM 2340C-
21
mg/L
5
001
Effluent
Aqueous
Nitrate -Nitrite - N
353.2
0.020
mg/L
5
001
Effluent
Aqueous
Phosphorus
365.1
1.3
mg/L
5
001
Effluent
Aqueous
TDS
SM 2540C-
350
mg/L
5
001
Effluent
Aqueous
TKN
351.2
2.3
mg/L
5
001
Effluent
Aqueous
Antimony
200.8
0.015
mg/L
8
001
Effluent
Aqueous
Chromium
200.8
0.0058
mg/L
8
001
Effluent
Aqueous
Copper
200.8
0.005
mg/L
8
001
Effluent
Aqueous
Zinc
200.8
0.055
mg/L
8
002
Effluent
Aqueous
Bromodichloromethane
624.1
10
ug/L
10
002
Effluent
Aqueous
Bromoform
624.1
2.1
ug/L
10
002
Effluent
Aqueous
Chloroform
624.1
5.6
ug/L
10
002
Effluent
Aqueous
Dibromochloromethane
624.1
8.4
ug/L
10
(14 detections)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 4 of 23

Inorganic non-metals
Client:City of Mount Holly Laboratory ID:XE05108-001
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0805
Date Received:05/05/2022
Run Prep Method
Analytical Method
Dilution
Analysis Date Analyst
Prep Date
Batch
1 350.1
(Ammonia - N ) 350.1
1
05/12/2022 1242 CMM
41397
1
(Hardness (to) SM 2340C-2011
1
06/02/2022 2054 TAD
43712
1
(Nitrate-Nitr) 353.2
1
05/06/2022 1745 KKP
40738
1
(Phosphorus) 365.1
1
05/09/2022 1717 DMA
40936
1
(TDS) SM 2540C-2011
1
05/11/2022 1715 CVR
41287
1 351.4
(TKN) 351.2
1
05/12/2022 1852 DMA
05/12/2022 1221 41378
CAS Analytical
Parameter
Number Method
Result Q
LOQ
Units
Run
Ammonia - N (gas diffusion)
350.1
0.14
0.10
mg/L
1
Hardness (total)
SM 2340C-2011
21
10
mg/L
1
Nitrate -Nitrite - N
353.2
0.020
0.020
mg/L
1
Phosphorus
7723-14-0 365.1
1.3
0.050
mg/L
1
TDS
SM 2540C-2011
350
25
mg/L
1
TKN
351.2
2.3
0.10
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure
H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 5 of 23

Semivolatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:XE05108-001
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0805
Date Received:05/05/2022
Run Prep Method Analytical Method
Dilution Analysis Date Analyst
Prep Date
Batch
1 625.1 625.1
10 05/20/2022 0200 JCG
05/12/2022 1908 41499
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acenaphthene
83-32-9
625.1
ND
16
ug/L
1
Acenaphthylene
208-96-8
625.1
ND
16
ug/L
1
Anthracene
120-12-7
625.1
ND
16
ug/L
1
Benzidine
92-87-5
625.1
ND
80
ug/L
1
Benzo(a)anthracene
56-55-3
625.1
ND
16
ug/L
1
Benzo(a)pyrene
50-32-8
625.1
ND
16
ug/L
1
Benzo(b)fluoranthene
205-99-2
625.1
ND
16
ug/L
1
Benzo(g,h,i)perylene
191-24-2
625.1
ND
16
ug/L
1
Benzo(k)fluoranthene
207-08-9
625.1
ND
16
ug/L
1
4-Bromophenyl phenyl ether
101-55-3
625.1
ND
16
ug/L
1
Butyl benzyl phthalate
85-68-7
625.1
ND
16
ug/L
1
bis (2-Chloro-1-methylethyl) ether
108-60-1
625.1
ND
16
ug/L
1
4-Chloro-3-methyl phenol
59-50-7
625.1
ND
16
ug/L
1
bis(2-Chloroethoxy)methane
111-91-1
625.1
ND
16
ug/L
1
bis(2-Chloroethyl)ether
111-44-4
625.1
ND
16
ug/L
1
2-Chloronaphthalene
91-58-7
625.1
ND
16
ug/L
1
2-Chlorophenol
95-57-8
625.1
ND
16
ug/L
1
4-Chlorophenyl phenyl ether
7005-72-3
625.1
ND
16
ug/L
1
Chrysene
218-01-9
625.1
ND
16
ug/L
1
Dibenzo(a,h)anthracene
53-70-3
625.1
ND
16
ug/L
1
3,3'-Dichlorobenzidine
91-94-1
625.1
ND
80
ug/L
1
2,4-Dichlorophenol
120-83-2
625.1
ND
16
ug/L
1
Diethylphthalate
84-66-2
625.1
ND
16
ug/L
1
Dimethyl phthalate
131-11-3
625.1
ND
16
ug/L
1
2,4-Dimethylphenol
105-67-9
625.1
ND
16
ug/L
1
Di-n-butyl phthalate
84-74-2
625.1
ND
16
ug/L
1
4,6-Dinitro-2-methylphenol
534-52-1
625.1
ND
80
ug/L
1
2,4-Dinitrophenol
51-28-5
625.1
ND
80
ug/L
1
2,4-Dinitrotoluene
121-14-2
625.1
ND
32
ug/L
1
2,6-Dinitrotoluene
606-20-2
625.1
ND
32
ug/L
1
Di-n-octylphthalate
117-84-0
625.1
ND
16
ug/L
1
1,2-Diphenylhydrazine(as azobenzene)
103-33-3
625.1
ND
16
ug/L
1
bis(2-Ethylhexyl)phthalate
117-81-7
625.1
ND
80
ug/L
1
Fluoranthene
206-44-0
625.1
ND
16
ug/L
1
Fluorene
86-73-7
625.1
ND
16
ug/L
1
Hexachlorobenzene
118-74-1
625.1
ND
16
ug/L
1
Hexachlorobutadiene
87-68-3
625.1
ND
16
ug/L
1
Hexachlorocyclopentadiene
77-47-4
625.1
ND
80
ug/L
1
Hexachloroethane
67-72-1
625.1
ND
16
ug/L
1
Indeno(1,2,3-c,d)pyrene
193-39-5
625.1
ND
16
ug/L
1
Isophorone
78-59-1
625.1
ND
16
ug/L
1
Naphthalene
91-20-3
625.1
ND
16
ug/L
1
Nitrobenzene
98-95-3
625.1
ND
16
ug/L
1
2-Nitrophenol
88-75-5
625.1
ND
32
ug/L
1
LOQ = Limit of Quantitation B = Detected in the method blank
E = Quantitation of
compound exceeded the calibration range
Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria
P = The RPD between two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W = Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 6 of 23

Semivolatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:XE05108-001
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0805
Date Received:05/05/2022
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 625.1 625.1 10 05/20/2022 0200 JCG 05/12/2022 1908 41499
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
4-Nitrophenol
100-02-7
625.1
ND
80
ug/L
1
N-Nitrosodimethylamine
62-75-9
625.1
ND
16
ug/L
1
N-Nitrosodi-n-propylamine
621-64-7
625.1
ND
16
ug/L
1
N-Nitrosodiphenylamine (Diphenylamine)
86-30-6
625.1
ND
16
ug/L
1
Pentachlorophenol
87-86-5
625.1
ND
80
ug/L
1
Phenanthrene
85-01-8
625.1
ND
16
ug/L
1
Phenol
108-95-2
625.1
ND
16
ug/L
1
Pyrene
129-00-0
625.1
ND
16
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
625.1
ND
16
ug/L
1
2,4,6-Trichlorophenol
88-06-2
625.1
ND
16
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery Limits
2-Fluorobiphenyl
57 37-129
2-Fluorophenol
51 24-127
Nitrobenzene-d5
58 38-127
Phenol-d5
44 28-128
Terphenyl-d14
70 10-148
2,4,6-Tribromophenol
90 41-144
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 %
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
Page 7 of 23

ICP-MS
Client:City of Mount Holly Laboratory ID:XE05108-001
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0805
Date Received:05/05/2022
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 200.2 200.8 1 05/10/2022 1355 BPK 05/09/2022 1158 40879
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
Antimony
7440-36-0
200.8
0.015
0.0050
mg/L
1
Arsenic
7440-38-2
200.8
ND
0.0020
mg/L
1
Beryllium
7440-41-7
200.8
ND
0.0010
mg/L
1
Cadmium
7440-43-9
200.8
ND
0.00050
mg/L
1
Chromium
7440-47-3
200.8
0.0058
0.0050
mg/L
1
Copper
7440-50-8
200.8
0.0050
0.0020
mg/L
1
Lead
7439-92-1
200.8
ND
0.0020
mg/L
1
Nickel
7440-02-0
200.8
ND
0.0020
mg/L
1
Selenium
7782-49-2
200.8
ND
0.0050
mg/L
1
Silver
7440-22-4
200.8
ND
0.0010
mg/L
1
Thallium
7440-28-0
200.8
ND
0.0020
mg/L
1
Zinc
7440-66-6
200.8
0.055
0.010
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 8 of 23
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure

Inorganic non-metals
Client:City of Mount Holly Laboratory ID:XE05108-002
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0807
Date Received:05/05/2022
Run Prep Method
Analytical Method
Dilution Analysis Date Analyst
Prep Date
Batch
1
(Phenolics) 420.4
1 05/06/2022 2124 DMA
40671
1
(HEM (oil and) 1664B
1 05/25/2022 0940 NFB
42894
CAS Analytical
Parameter
Number Method
Result Q
LOQ Units Run
Phenolics
420.4
ND
0.0050 mg/L 1
HEM (oil and grease)
1664B
ND
5.3 mg/L 1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
Page 9 of 23

Volatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:XE05108-002
Description: Effluent Matrix: Aqueous
Date Sampled:05/05/2022 0807
Date Received:05/05/2022
Run Prep Method
Analytical Method Dilution Analysis Date Analyst
Prep Date
Batch
1 624.1
624.1 1 05/19/20221725 JWO
42357
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acrolein
107-02-8
624.1
ND
5.0
ug/L
1
Acrylonitrile
107-13-1
624.1
ND
5.0
ug/L
1
Benzene
71-43-2
624.1
ND
1.0
ug/L
1
Bromodichloromethane
75-27-4
624.1
10
1.0
ug/L
1
Bromoform
75-25-2
624.1
2.1
1.0
ug/L
1
Bromomethane (Methyl bromide)
74-83-9
624.1
ND
2.0
ug/L
1
Carbon tetrachloride
56-23-5
624.1
ND
1.0
ug/L
1
Chlorobenzene
108-90-7
624.1
ND
1.0
ug/L
1
Chloroethane
75-00-3
624.1
ND
2.0
ug/L
1
2-Chloroethylvinylether
110-75-8
624.1
ND
5.0
ug/L
1
Chloroform
67-66-3
624.1
5.6
1.0
ug/L
1
Chloromethane (Methyl chloride)
74-87-3
624.1
ND
2.0
ug/L
1
Dibromochloromethane
124-48-1
624.1
8.4
1.0
ug/L
1
1,2-Dichlorobenzene
95-50-1
624.1
ND
1.0
ug/L
1
1,3-Dichlorobenzene
541-73-1
624.1
ND
1.0
ug/L
1
1,4-Dichlorobenzene
106-46-7
624.1
ND
1.0
ug/L
1
Dichlorodifluoromethane
75-71-8
624.1
ND
2.0
ug/L
1
1,1-Dichloroethane
75-34-3
624.1
ND
1.0
ug/L
1
1,2-Dichloroethane
107-06-2
624.1
ND
1.0
ug/L
1
1,1-Dichloroethene
75-35-4
624.1
ND
1.0
ug/L
1
cis- 1,2-Dichloroethene
156-59-2
624.1
ND
1.0
ug/L
1
trans- 1,2-Dichloroethene
156-60-5
624.1
ND
1.0
ug/L
1
1,2-Dichloropropane
78-87-5
624.1
ND
1.0
ug/L
1
cis- 1,3-Dichloropropene
10061-01-5
624.1
ND
1.0
ug/L
1
trans- 1,3-Dichloropropene
10061-02-6
624.1
ND
1.0
ug/L
1
Ethylbenzene
100-41-4
624.1
ND
1.0
ug/L
1
Methylene chloride
75-09-2
624.1
ND
1.0
ug/L
1
1,1,2,2-Tetrachloroethane
79-34-5
624.1
ND
1.0
ug/L
1
Tetrachloroethene
127-18-4
624.1
ND
1.0
ug/L
1
Toluene
108-88-3
624.1
ND
1.0
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
624.1
ND
1.0
ug/L
1
1,1,1-Trichloroethane
71-55-6
624.1
ND
1.0
ug/L
1
1,1,2-Trichloroethane
79-00-5
624.1
ND
1.0
ug/L
1
Trichloroethene
79-01-6
624.1
ND
1.0
ug/L
1
Trichlorofluoromethane
75-69-4
624.1
ND
1.0
ug/L
1
Vinyl chloride
75-01-4
624.1
ND
1.0
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery Limits
Bromofluorobenzene
100 70-130
1,2-Dichloroethane-d4
114 70-130
Toluene-d8
92 70-130
LOQ = Limit of Quantitation B =
Detected in the method blank E = Quantitation of compound exceeded the calibration range
Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between
two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W
= Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 10 of 23

Chain of Custody
and
Miscellaneous Documents
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 11 of 23

PACE ANALYTICAL SERVICES, LLC
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Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 12 of 23

PACE ANALYTICAL SERVICES, LLC
San,}�Its RCf,i2 Ot Checklist (SRiQ trylaialgC-15) Hevi5tad=9f 9J n
IS5L.Nt ithoa'iLv:FactFNV-bVLOL
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Client: hiLH gL14'tr'7'P cr.orrrins tBd •+date,. CRP (�51�7S 1G"'
fir} _ I T ,rli• 7CEOiit}$
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FTvI was ldotil ictl by one r ciralf { fa,x-i4rf`acca (circ:c one}
'Fa� N A 4. Is 1h9 cxrmmerda] taus er'S [€insri
F Yrs N E p attached to this form?
�, WarG p�l�L'. wu•���,dy P acedu�Cs (�Fnqui�h�d,'r�u:ived} Follawcd'�
Yes t3 5. w= (ample IDs kstedl on the cot
+ 'Yes No ?. t�fere Simple TT}s lists o on III sats,ple eartairt r�?
YCS h!n S, WUS calIzction dare & qme listed on the Ct]C? -
0 yms Na `i" k4a:; caIleatiou date & rye lj�lcd on all sample container-9?
,r Yes Na J D, Did all container '.al, i aaftarrn , date, time. with Leo C,'O
Yew Ala IT - V C test; to be Fcrt'a ' ed list--d cut 17 COC•?
© Yts N + Did ail sarrrpl>~5 Crrive r the proper o—txiners for Lath tcst audio, :u rapd condition
(unbrakep, lids on, ate_)?
Yes Nu i3_ Was ajogaaw sampr# v�lunte available?
Yes No i4_ Were all samFlesracci> lvvitriirt /� thel�alriin time ar 48 hours, xhiC[tevercornes first?
k'cs tJu 1 _ V4'cre at3} samples 7nt8:n�K3 tnissing�c cess Chore ❑net samples Not WL- nil OOC?
❑ A J 4, Htsr V{}A and RSK- !7S aaltip]CS, wore Ujbbl s rrMellt pea s;ze" (fi or smut in diarrLetaj
Ih O4 the voA vint ?
d Yes No NA ] T_ Were alt DRCNmetalaftty 1. ient samples x cselvad al I'p11 Qf 29
,f Yes NQ NA i8_ Vs+ere all cyanide .SaiN received tit a l-1 : -
Ves QNO ]9_—CLt;ail appl,Cab;e N11 P l :�rrd suiJacle samples SUAPtd Ic
�jV, �� }antdrw cool{(.1 08_.; ( 0, rnpfL)samplcs t""rze
rE'Sidusl cl3lorin::g I
I Yes ❑NO [ NA 20, Wore clica7L rnrnarl'salreq�s C,c, req��est�el tlilettions_ MSIMST? designations, ctc_..?
MrrXdy transcribed Fran, tljc COC i nt,) the comment sect itut in LIMe'y
Yes -/ Na �, 1'.'bIs the ,tatenumber list ! an the Ca:7tainer label? if s4 oOEi
Sainple Prewr Vation Must be EAMPieted for a[ry Sim plv(s) irrcon�ectry AreSCrvad (u with Itieadspgce-)
LT,ple(sj _ 1',u£ae retiued ir+torrcr:tJ
in mrplc receiving with rnL of cticle y pr�serwgd anti ware rtdju d accarding�y
Time o NA— — HZS�4, HNO3, HCI, NUGH a3ir;g SR # Nr1 _
pies tsnn _ Wmore than ort4 piresrrvetivc is n2cded, please note in the ClInI below,
Sample(s) NA
Il�1
- i . wry ra::eived Wi#It boblat&i rtup in diam.I
`U�at112.3(3) MA
WI received with "1"F 7 7, (If#19 is no) and Sucre
{It3iustef at cordir�gly in u+t-7pla receiving with sodium t}KuwlfteVnryS'C}a uitlt Shealy Its:
SR harcode lahcL applied }rj: r{DRw DSADSJ702s
L1�=
Comments.
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 13 of 23

aceAna lytical
LELAP CERTIFICATE NUMBER: 01955
DOD-ELAP ACCREDITATION NUMBER: 74960
ANALYTICAL RESULTS
•:I
Pace Analytical Gulf Coast
7979 Innovation Park Dr.
Baton Rouge, LA 70820
[phone]
Report Date 06/01/2022
Report Y 222052040
�1��i �1��i �1��i �1��i �1��i �1��i �1��i �1��i �1��i III
Project XE05108 EFF Pollutant Scan
Samples Collected 5/5/22
Deliver To Additional Recipients
Edward Barnett NONE
Pace Analytical
106 Vantage Point Dr
Columbia, SC 29223
803.509.8398
I*' -
MILLI
moons
DOD E[Ar
Pace Gulf Coast Report#: 222052040 Page 1 of 10
Page 14 of 23

Report#: 222052040
aceAnarytical
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/O1/2022
Laboratory Endorsement
Sample analysis was performed in accordance with approved methodologies provided by the Environmental Protection Agency or other recognized
agencies. The samples and their corresponding extracts will be maintained for a period of 30 days unless otherwise arranged. Following this
retention period the samples will be disposed in accordance with Pace Gulf Coast's Standard Operating Procedures.
Common Abbreviations that may be Utilized in this Report
ND Indicates the result was Not Detected at the specified reporting limit
NO Indicates the sample did not ignite when preliminary test performed for EPA Method 1030
DO Indicates the result was Diluted Out
MI Indicates the result was subject to Matrix Interference
TNTC Indicates the result was Too Numerous To Count
SUBC Indicates the analysis was Sub -Contracted
FLD Indicates the analysis was performed in the Field
DL Detection Limit
LOD Limit of Detection
LOQ Limit of Quantitation
RE Re -analysis
CF HPLC or GC Confirmation
00:01 Reported as a time equivalent to 12:00 AM
Reporting Flags that may be Utilized in this Report
J or I Indicates the result is between the MDL and LOQ
J DOD flag on analyte in the parent sample for MS/MSD outside acceptance criteria
U Indicates the compound was analyzed for but not detected
B or V Indicates the analyte was detected in the associated Method Blank
Q Indicates a non -compliant QC Result (See Q Flag Application Report)
" Indicates a non -compliant or not applicable QC recovery or RPD — see narrative
E Organics - The result is estimated because it exceeded the instrument calibration range
E Metals - % diference for the serial dilution is > 10%
L Reporting Limits adjusted to meet risk -based limit.
P RPD between primary and confirmation result is greater than 40
DL Diluted analysis — when appended to Client Sample ID
Sample receipt at Pace Gulf Coast is documented through the attached chain of custody. In accordance with NELAC, this report shall be
reproduced only in full and with the written permission of Pace Gulf Coast. The results contained within this report relate only to the samples
reported. The documented results are presented within this report.
This report pertains only to the samples listed in the Report Sample Summary and should be retained as a permanent record thereof. The results
contained within this report are intended for the use of the client. Any unauthorized use of the information contained in this report is prohibited.
I certify that this data package is in compliance with The NELAC Institute (TNI) Standard 2009 and terms and conditions of the contract and
Statement of Work both technically and for completeness, for other than the conditions in the case narrative. Release of the data contained in this
hardcopy data package and in the computer readable data submitted has been authorized by the Quality Assurance Manager or his/her designee,
as verified by the following signature.
Estimated uncertainty of measurement is available upon request. This report is in compliance with the DOD QSM as specified in the contract if
applicable.
Authorized Signature
Pace Gulf Coast Report 222052040
Pace Gulf Coast Report#: 222052040 Page 2 of 10
Page 15 of 23

1 _21Analytical
Report#: 222052040
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/01/2022
Certifications
Certification
Certification Number
DOD ELAP
74960
Alabama
01955
Arkansas
88-0655
Colorado
01955
Delaware
01955
Florida
E87854
Georgia
01955
Hawaii
01955
Idaho
01955
Illinois
200048
Indiana
01955
Kansas
E-10354
Kentucky
95
Louisiana
01955
Maryland
01955
Massachusetts
01955
Michigan
01955
Mississippi
01955
Missouri
01955
Montana
N/A
Nebraska
01955
New Mexico
01955
North Carolina
618
North Dakota
R-195
Oklahoma
9403
South Carolina
73006001
South Dakota
01955
Tennessee
01955
Texas
T104704178
Vermont
01955
Virginia
460215
Washington
C929
USDA Soil Permit
P330-16-00234
Pace Gulf Coast Report#: 222052040 Page 3 of 10
Page 16 of 23

Report#: 222052040
aceAnarytical
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/01/2022
Case Narrative
Client: Pace Analytical Services Report: 222052040
Pace Analytical Gulf Coast received and analyzed the sample(s) listed
on the Report Sample Summary page of this report. Receipt of the sample(s) is documented
by the attached chain of custody. This applies only to the sample(s) listed in this report.
No sample integrity or quality control exceptions were identified unless noted below.
No anomalies were found for the analyzed sample(s).
Pace Gulf Coast Report#: 222052040 Page 4 of 10
Page 17 of 23

1 21'Analytical
Lab ID
Report#: 222052040
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/01/2022
Sample Summary
Client ID Matrix Collect Date Receive Date
22205204001 EFFLUENT
Water 5/05/22 08:07 5/20/22 09:17
Pace Gulf Coast Report#: 222052040 Page 5 of 10
Page 18 of 23

Report#: 222052040
aceAnarytical
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/01/2022
Detect Summary
Results and Detection Limits are adjusted for dilution and moisture when applicable
EPA 335.4
Lab ID Client ID Parameter Units Result Dil. %Moist
22205204001 EFFLUENT Cyanide mg/L 0.0071 1 NA
Pace Gulf Coast Report#: 222052040 Page 6 of 10
Page 19 of 23

Report#: 222052040
aceAr�alytrca!
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/O1/2022
Sample Results
EFFLUENT Collect Date 05/05/2022 08:07 Lab ID 22205204001
Receive Date 05/20/2022 09:17 Matrix Water
EPA 335.4
Prep Date Prep Batch Prep Method Dilution Run Date Run Batch Analyst %Moisture
05/23/22 09:30 741544 Cyanide Prep 1 05/24/22 09:32 741624 MOS NA
CAS# Parameter
57-12-5 Cyanide
Result LOQ Units
0.0071 0.0040 mg/L
Pace Gulf Coast Report#: 222052040 Page 7 of 10
Page 20 of 23

1 21'Analytical
Report#: 222052040
Project ID: XE05108 EFF Pollutant Scan Report Date: 06/01/2022
General Chemistry QC Summary
Analytical Batch Client ID
MB741544
LCS741544
LCSH1741544
741624 Lab ID
2350136
2350137
2350138
Prep Batch Sample Type
MB
LCS
LCSHI
741544 Prep Date
05/23/22 09:30
05/23/22 09:30
05/23/22 09:30
Prep Method Analysis Date
05/24/22 09:16
05/24/22 09:18
05/24/22 09:20
Cyanide Prep Matrix
Water
Water
Water
EPA 335.4
Units
mg/L
Spike
Result
%R
Control
Spike
Result
%R
I
Control
Result
LOO
Added
Limits%R
1 Added
Limits%R
Cyanide 57-12-5
NDI
0.00401
0.020
1 0.019
197
1 80 - 120
1 0.10
1 0.0831
83
1 80 - 120
Pace Gulf Coast Report#: 222052040 Page 8 of 10
Page 21 of 23

v!!vnt!n; 4367 _ Pace nal\I
L1irwl Qann oc
Chain of Custody SDG: 222052040
PM: RWe
Workorder: XE05108 Workorder Name: EFF Pollutant Scan Owner Received Date: 5/5/2022 Results Requested By: 5/27/2022
Report To:
(Subcontract To:
o
LU
zy
o
Requested
Analysis
LAB USE ONLY
Edward T. Barnett Project #
Pace Analytical
106 Vantage Point Drive Pace -Gulf Coast
Columbia SC, 29223
803-227-2706
[e-mail]
Preserved Containers
Item
Sample ID
Sample
Type
Collect
Date/Time
Lab ID
Matrix
o
z
1
Effluent
grab
05/05/2022 @ 0807
XE05108-002
Aqueous
X
X
2
3
4
5
6
7
8
9
10
Transfers
Released By
Date/Time
Reveived By
Date/Time
Comments
1
2
3
LZ=_ L ,0u— dc� C-r- N I ' JOol sue- CCLLJc_X -% a2 C4..1-1
cooler Temperature on Receipt °CI Custody Seal Y or N Received on Ice Y or N Sample Intact Y or N
***In order to maintain client confidentiality, location/name of the sampling site, sampler's name and signature may not be provided on this COC
This chain of custody is considered complete as is since this information is available in the owner laboratory.
Friday, June 17, 2016 11:01:34 AM
FMT-ALL-C-002rev.00 24March2009
Page 1 of 1
Pace Gulf Coast Report#: 222052040 Page 9 of 10
Page 22 of 23

(�eAnalyfical'SAMPLE RECEIVING CHECKLIST IIIIIIIIIIIIIIIIIIII
SAMPLE DELIVERY GROUP
222052040
CHECKLIST
YES
NO
Client PM RIUe
Transport Method
Samples received with proper thermal preservation?
*❑
❑
4367 - Pace Analytical Services
F®DC
Radioactivity is <1600 cpm? If no, record cpm value in notes section.
COC relinquished and complete (including samplelDs, collect times, and sampler)?
*❑
*❑
❑
❑
Profile Number
Received ®y
296533
Perkins, Brennan
All containers received in good condition and within hold time?
All sample labels and containers received match the chain of custody?
0
0
❑
❑
Line Item(s)
Receive Date(s)
2 -Cyanide
05/20/22
Preservative added to any containers?
❑
0
If received, was headspace for VOC water containers < 6mm?
0
❑
Samples collected in containers provided by Pace Gulf Coast?
0
❑
COOLERS
DISCREPANCIES
LAB PRESERVATIONS
Airbill Thermometer ID: E38
Temp °C
None
None
166334670348
1.0
NOTES
Revision 1.6
Page 1 of 1
Pace Gulf Coast Report#: 222052040
Page 23 of 23
Page 10 of 10

0
aceAnalytical
Report of Analysis
City of Mount Holly
PO Box 406
Mount Holly, NC 28120
Attention: Keith Lynch
Project Name: Effluent Pollutant Scan
Lot Number:YH17061
Date Completed:09/06/2023
09/06/2023 3:42 PM
Approved and released by:
Project Manager II: Edward Barnett
PCCRFO
24r
ANSI National Accreditation Board
qe0
A C C R E D I T E D
TESTING LABORATORY
The electronic signature above is the equivalent of a handwritten signature.
This report shall not be reproduced, except in its entirety, without the written approval of Pace Analytical Services, LLC.
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172
Tel:[phone] Fax:[phone] www.pacelabs.com
Page 1 of 13

PACE ANALYTICAL SERVICES, LLC
SC DHEC No: 32010001 NELAC No: E87653 NC DENR No: 329 NC Field Parameters No: 5639
Case Narrative
City of Mount Holly
Lot Number: YH17061
This Report of Analysis contains the analytical result(s) for the sample(s) listed on the Sample Summary
following this Case Narrative. The sample receiving date is documented in the header information
associated with each sample.
All results listed in this report relate only to the samples that are contained within this report. Where
sampling is conducted by the client, results relate to the accuracy of the information provided, and as the
samples are received.
Sample receipt, sample analysis, and data review have been performed in accordance with the most
current approved The NELAC Institute (TNI) standards, the Pace Analytical Services, LLC ("Pace")
Laboratory Quality Manual, standard operating procedures (SOPS), and Pace policies. Any exceptions to
the TNI standards, the Laboratory Quality Manual, SOPS or policies are qualified on the results page or
discussed below.
Pace is a TNI accredited laboratory; however, the following analyses are currently not listed on our TNI
scope of accreditation: Drinking Water: VOC (excluding BTEX, MTBE, Naphthalene, & 1,2-
dichloroethane) EPA 524.2, E. coli and Total coliforms SM 9223 B-2004, Solid Chemical Material: TOC
Walkley-Black, Biological Tissue: All, Non -Potable Water: SGT-HEM EPA 1664B, Silica EPA 200.7,
Boron, Calcium, Silicon, Strontium EPA 200.8, Bicarbonate, Carbonate, and Hydroxide Alkalinity SM 2320
B-2011, SM 9221 C E-2006 & SM 9222D-2006, Strontium SW-846 6010D, VOC SM 6200 B-2011, Fecal
Coliform Colilert-18, PFAS by Isotope Dilution SOP.
If you have any questions regarding this report, please contact the Pace Project Manager listed on the
cover page.
vOCs
Insufficient sample volume was provided to perform matrix spike/matrix spike duplicate (MS/MSD) for
analytical batch 83240. An LCS/LCSD was run in lieu of an MS/MSD.
The following sample YH17061-002 was improperly preserved in the field.
svOCs
The following sample was diluted due to the nature of the sample matrix: YH17061-001. The LOQ has
been elevated to reflect the dilution.
Inorganic Non -Metals
The laboratory control sample (LCS) and / or the laboratory control sample duplicate (LCSD) for TDS
analytical batch 83208 outside of acceptance criteria (90-110%). Reanalysis was performed and
confirmed the initial result.
Pace Analytical Services, LLC (formerly Shealy Environmetal Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 2 of 13

PACE ANALYTICAL SERVICES, LLC
Sample Summary
City of Mount Holly
Lot Number: YH17061
Sample Number Sample ID Matrix Date Sampled Date Received
001 EFFLUENT Aqueous 08/17/20231005 08/17/2023
002 EFFLUENT Aqueous 08/17/20231004 08/17/2023
(2 samples)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 3 of 13

PACE ANALYTICAL SERVICES,
LLC
Detection Summary
City of Mount Holly
Lot Number: YH17061
Sample
Sample ID
Matrix
Parameter Method
Result Q
Units
Page
001
EFFLUENT
Aqueous
Hardness (total) SM 2340C-
41
mg/L
6
001
EFFLUENT
Aqueous
Nitrate -Nitrite - N 353.2
2.2
mg/L
6
001
EFFLUENT
Aqueous
Phosphorus 365.1
2.6
mg/L
6
001
EFFLUENT
Aqueous
TDS SM 2540C-
350 L
mg/L
6
001
EFFLUENT
Aqueous
TKN 351.2
1.5
mg/L
6
001
EFFLUENT
Aqueous
Antimony 200.8
0.015
mg/L
9
001
EFFLUENT
Aqueous
Copper 200.8
0.012
mg/L
9
001
EFFLUENT
Aqueous
Zinc 200.8
0.028
mg/L
9
002
EFFLUENT
Aqueous
Bromodichloromethane 624.1
17
ug/L
11
002
EFFLUENT
Aqueous
Bromoform 624.1
8.4
ug/L
11
002
EFFLUENT
Aqueous
Chloroform 624.1
7.3
ug/L
11
002
EFFLUENT
Aqueous
Dibromochloromethane 624.1
25
ug/L
11
(12 detections)
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 4 of 13

Inorganic non-metals
Client:City of Mount Holly Laboratory ID:YH17061-001
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1005
Date Received:08/17/2023
Run Prep Method
Analytical Method
Dilution Analysis Date Analyst
Prep Date
Batch
1 350.1
(Ammonia - N ) 350.1
1 08/18/2023 1300 CMM
82849
1 (Hardness (to) SM 2340C-2011
1 08/28/2023 1547 TAD
83532
1
(Nitrate-Nitr) 353.2
2 08/19/2023 1129 CLL2
83070
1
(Phosphorus) 365.1
2 08/18/2023 1627 DMA
82870
1
(TDS) SM 2540C-2015
1 08/23/2023 1448 WEH
83208
1 351.4
(TKN) 351.2
1 08/25/2023 1714 DMA
08/20/2023 1815 82704
CAS Analytical
Parameter
Number Method
Result Q
LOQ
Units
Run
Ammonia - N (gas diffusion)
350.1
ND
0.10
mg/L
1
Hardness (total)
SM 2340C-2011
41
10
mg/L
1
Nitrate -Nitrite - N
353.2
2.2
0.040
mg/L
1
Phosphorus
7723-14-0 365.1
2.6
0.10
mg/L
1
TDS
SM 2540C-2015
350 L
25
mg/L
1
TKN
351.2
1.5
0.10
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure
H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 5 of 13

Semivolatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:YH17061-001
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1005
Date Received:08/17/2023
Run Prep Method Analytical Method
Dilution Analysis Date Analyst
Prep Date
Batch
1 625.1 625.1
10 08/25/2023 1815 JCG
08/22/2023 1552 83125
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acenaphthene
83-32-9
625.1
ND
16
ug/L
1
Acenaphthylene
208-96-8
625.1
ND
16
ug/L
1
Anthracene
120-12-7
625.1
ND
16
ug/L
1
Benzidine
92-87-5
625.1
ND
80
ug/L
1
Benzo(a)anthracene
56-55-3
625.1
ND
16
ug/L
1
Benzo(a)pyrene
50-32-8
625.1
ND
16
ug/L
1
Benzo(b)fluoranthene
205-99-2
625.1
ND
16
ug/L
1
Benzo(g,h,i)perylene
191-24-2
625.1
ND
16
ug/L
1
Benzo(k)fluoranthene
207-08-9
625.1
ND
16
ug/L
1
4-Bromophenyl phenyl ether
101-55-3
625.1
ND
16
ug/L
1
Butyl benzyl phthalate
85-68-7
625.1
ND
16
ug/L
1
bis (2-Chloro-1-methylethyl) ether
108-60-1
625.1
ND
16
ug/L
1
4-Chloro-3-methyl phenol
59-50-7
625.1
ND
16
ug/L
1
bis(2-Chloroethoxy)methane
111-91-1
625.1
ND
16
ug/L
1
bis(2-Chloroethyl)ether
111-44-4
625.1
ND
16
ug/L
1
2-Chloronaphthalene
91-58-7
625.1
ND
16
ug/L
1
2-Chlorophenol
95-57-8
625.1
ND
16
ug/L
1
4-Chlorophenyl phenyl ether
7005-72-3
625.1
ND
16
ug/L
1
Chrysene
218-01-9
625.1
ND
16
ug/L
1
Dibenzo(a,h)anthracene
53-70-3
625.1
ND
16
ug/L
1
3,3'-Dichlorobenzidine
91-94-1
625.1
ND
80
ug/L
1
2,4-Dichlorophenol
120-83-2
625.1
ND
16
ug/L
1
Diethylphthalate
84-66-2
625.1
ND
16
ug/L
1
Dimethyl phthalate
131-11-3
625.1
ND
16
ug/L
1
2,4-Dimethylphenol
105-67-9
625.1
ND
16
ug/L
1
Di-n-butyl phthalate
84-74-2
625.1
ND
16
ug/L
1
4,6-Dinitro-2-methylphenol
534-52-1
625.1
ND
80
ug/L
1
2,4-Dinitrophenol
51-28-5
625.1
ND
80
ug/L
1
2,4-Dinitrotoluene
121-14-2
625.1
ND
32
ug/L
1
2,6-Dinitrotoluene
606-20-2
625.1
ND
32
ug/L
1
Di-n-octylphthalate
117-84-0
625.1
ND
16
ug/L
1
1,2-Diphenylhydrazine(as azobenzene)
103-33-3
625.1
ND
16
ug/L
1
bis(2-Ethylhexyl)phthalate
117-81-7
625.1
ND
80
ug/L
1
Fluoranthene
206-44-0
625.1
ND
16
ug/L
1
Fluorene
86-73-7
625.1
ND
16
ug/L
1
Hexachlorobenzene
118-74-1
625.1
ND
16
ug/L
1
Hexachlorobutadiene
87-68-3
625.1
ND
16
ug/L
1
Hexachlorocyclopentadiene
77-47-4
625.1
ND
80
ug/L
1
Hexachloroethane
67-72-1
625.1
ND
16
ug/L
1
Indeno(1,2,3-c,d)pyrene
193-39-5
625.1
ND
16
ug/L
1
Isophorone
78-59-1
625.1
ND
16
ug/L
1
Naphthalene
91-20-3
625.1
ND
16
ug/L
1
Nitrobenzene
98-95-3
625.1
ND
16
ug/L
1
2-Nitrophenol
88-75-5
625.1
ND
32
ug/L
1
LOQ = Limit of Quantitation B = Detected in the method blank
E = Quantitation of compound exceeded the
calibration range
Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria
P = The RPD between two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W = Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 6 of 13

Semivolatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:YH17061-001
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1005
Date Received:08/17/2023
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 625.1 625.1 10 08/25/2023 1815 JCG 08/22/2023 1552 83125
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
4-Nitrophenol
100-02-7
625.1
ND
80
ug/L
1
N-Nitrosodimethylamine
62-75-9
625.1
ND
16
ug/L
1
N-Nitrosodi-n-propylamine
621-64-7
625.1
ND
16
ug/L
1
N-Nitrosodiphenylamine (Diphenylamine)
86-30-6
625.1
ND
16
ug/L
1
Pentachlorophenol
87-86-5
625.1
ND
80
ug/L
1
Phenanthrene
85-01-8
625.1
ND
16
ug/L
1
Phenol
108-95-2
625.1
ND
16
ug/L
1
Pyrene
129-00-0
625.1
ND
16
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
625.1
ND
16
ug/L
1
2,4,6-Trichlorophenol
88-06-2
625.1
ND
16
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery
Limits
2-Fluorobiphenyl
66
37-129
2-Fluorophenol
27
24-127
Nitrobenzene-d5
63
38-127
Phenol-d5
33
28-128
Terphenyl-d14
76
10-148
2,4,6-Tribromophenol
137
41-144
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 %
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 7 of 13
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure

ICP-MS
Client:City of Mount Holly Laboratory ID:YH17061-001
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1005
Date Received:08/17/2023
Run
Prep Method
Analytical Method
Dilution Analysis Date Analyst
Prep Date Batch
1
200.2
200.8
1 08/24/2023 1650 BNW
08/22/2023 1133 82990
2
200.2
200.8
1 08/25/2023 1835 BNW
08/22/2023 1133 82990
Parameter
CAS Analytical
Number Method Result Q LOQ Units Run
Antimony
7440-36-0
200.8
0.015
0.0050
mg/L
1
Arsenic
7440-38-2
200.8
ND
0.0020
mg/L
1
Beryllium
7440-41-7
200.8
ND
0.0010
mg/L
2
Cadmium
7440-43-9
200.8
ND
0.00050
mg/L
1
Chromium
7440-47-3
200.8
ND
0.0050
mg/L
1
Copper
7440-50-8
200.8
0.012
0.0020
mg/L
1
Lead
7439-92-1
200.8
ND
0.0020
mg/L
1
Nickel
7440-02-0
200.8
ND
0.0020
mg/L
1
Selenium
7782-49-2
200.8
ND
0.0050
mg/L
1
Silver
7440-22-4
200.8
ND
0.0010
mg/L
1
Thallium
7440-28-0
200.8
ND
0.0020
mg/L
1
Zinc
7440-66-6
200.8
0.028
0.010
mg/L
1
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 8 of 13
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure

Inorganic non-metals
Client:City of Mount Holly Laboratory ID:YH17061-002
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1004
Date Received:08/17/2023
Run Prep Method
Analytical Method Dilution
Analysis Date Analyst
Prep Date Batch
1 10-204-00-1-X
(Cyanide - To) SM 4500-CN E- 1
08/22/2023 2248 NAB
08/22/2023 1926 82702
1
(Phenolics) 420.4 1
08/21/2023 1356 DMA
82972
1
(HEM (oil and) 1664B 1
08/20/2023 1047 KIH
82926
CAS Analytical
Parameter Number Method Result Q LOQ Units Run
Cyanide - Total
Phenolics
HEM (oil and grease)
57-12-5 SM 4500-CN E-2 ND
420.4 ND
1664B ND
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40
H = Out of holding time W = Reported on wet weight basis
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
0.010 mg/L 1
0.0050 mg/L 1
5.0 mg/L 1
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
Page 9 of 13

Volatile Organic Compounds by GC/MS
Client:City of Mount Holly Laboratory ID:YH17061-002
Description: EFFLUENT Matrix: Aqueous
Date Sampled:08/17/2023 1004
Date Received:08/17/2023
Run Prep Method
Analytical Method Dilution Analysis Date Analyst
Prep Date
Batch
1 624.1
624.1 1 08/23/2023 1729 AMR2
83240
CAS
Analytical
Parameter
Number
Method
Result Q
LOQ
Units
Run
Acrolein
107-02-8
624.1
ND
5.0
ug/L
1
Acrylonitrile
107-13-1
624.1
ND
5.0
ug/L
1
Benzene
71-43-2
624.1
ND
1.0
ug/L
1
Bromodichloromethane
75-27-4
624.1
17
1.0
ug/L
1
Bromoform
75-25-2
624.1
8.4
1.0
ug/L
1
Bromomethane (Methyl bromide)
74-83-9
624.1
ND
2.0
ug/L
1
Carbon tetrachloride
56-23-5
624.1
ND
1.0
ug/L
1
Chlorobenzene
108-90-7
624.1
ND
1.0
ug/L
1
Chloroethane
75-00-3
624.1
ND
2.0
ug/L
1
2-Chloroethylvinylether
110-75-8
624.1
ND
5.0
ug/L
1
Chloroform
67-66-3
624.1
7.3
1.0
ug/L
1
Chloromethane (Methyl chloride)
74-87-3
624.1
ND
2.0
ug/L
1
Dibromochloromethane
124-48-1
624.1
25
1.0
ug/L
1
1,2-Dichlorobenzene
95-50-1
624.1
ND
1.0
ug/L
1
1,3-Dichlorobenzene
541-73-1
624.1
ND
1.0
ug/L
1
1,4-Dichlorobenzene
106-46-7
624.1
ND
1.0
ug/L
1
Dichlorodifluoromethane
75-71-8
624.1
ND
2.0
ug/L
1
1,1-Dichloroethane
75-34-3
624.1
ND
1.0
ug/L
1
1,2-Dichloroethane
107-06-2
624.1
ND
1.0
ug/L
1
1,1-Dichloroethene
75-35-4
624.1
ND
1.0
ug/L
1
cis- 1,2-Dichloroethene
156-59-2
624.1
ND
1.0
ug/L
1
trans- 1,2-Dichloroethene
156-60-5
624.1
ND
1.0
ug/L
1
1,2-Dichloropropane
78-87-5
624.1
ND
1.0
ug/L
1
cis- 1,3-Dichloropropene
10061-01-5
624.1
ND
1.0
ug/L
1
trans- 1,3-Dichloropropene
10061-02-6
624.1
ND
1.0
ug/L
1
Ethylbenzene
100-41-4
624.1
ND
1.0
ug/L
1
Methylene chloride
75-09-2
624.1
ND
1.0
ug/L
1
1,1,2,2-Tetrachloroethane
79-34-5
624.1
ND
1.0
ug/L
1
Tetrachloroethene
127-18-4
624.1
ND
1.0
ug/L
1
Toluene
108-88-3
624.1
ND
1.0
ug/L
1
1,2,4-Trichlorobenzene
120-82-1
624.1
ND
1.0
ug/L
1
1,1,1-Trichloroethane
71-55-6
624.1
ND
1.0
ug/L
1
1,1,2-Trichloroethane
79-00-5
624.1
ND
1.0
ug/L
1
Trichloroethene
79-01-6
624.1
ND
1.0
ug/L
1
Trichlorofluoromethane
75-69-4
624.1
ND
1.0
ug/L
1
Vinyl chloride
75-01-4
624.1
ND
1.0
ug/L
1
Run 1 Acceptance
Surrogate
Q % Recovery
Limits
Bromofluorobenzene
96
70-130
1,2-Dichloroethane-d4
88
70-130
Toluene-d8
97
70-130
LOQ = Limit of Quantitation B =
Detected in the method blank E = Quantitation
of compound exceeded the
calibration range
Q = Surrogate failure
ND = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD
between two GC columns exceeds 40 %
L = LCS/LCSD
failure
H = Out of holding time W
= Reported on wet weight basis
S = MS/MSD
failure
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 10 of 13

Chain of Custody
and
Miscellaneous Documents
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 11 of 13

PACE ANALYTICAL SERVICES, LLC
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106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 12 of 13

PACE ANALYTICAL SERVICES, LLC
XR Title. ENV..FRM-AtoL- 86vO2_Samplcs RewiptCheabrit{SRt=}
Eifective Nto; Sf2f2nP.2
Sample Receipt Cheeldist (SRC)
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zYcs [:]No 13. Vert 01- samples coidaiuers accouutcd 30e! (No ilussi; --*Tccm)
rr 3.d, �le1+e �O_�L SO1�Ca1r3�,S-17S s�lu}1lesfree oflxtl�l�Ies� `�rrt:1-size" �'"or �r1]1171 n1
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yc5 Nl� : S. Were all ]�i�C�'tperaT at�e171 sg11 *s recdwd 9t A H of< 27 i
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5enices, LLC
Page 1
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Page 13 of 13

enutmnmranfa , inc.
P.G. 5Ux'IC-414. rreenvlle, SC 29605
(ESd) 877-6942 . FAX [phone]
4 Craftsman Court, Graer. 5C 29550
Fathead Minnow Survival and Growth Test
EPA-821-R-02-013 Method 1000
Client: CITY OF MOUNT HOLLY
Facility: WWTP
NPDES #., NCO021156
Test Date: 09-Feb-22
Laboratory Sample ID #: T61222 P promelas
Test Reviewed and Approved By:
41
Robert W. Kelley, Ph.D.
President
Certification #E87819
Test results presented in this report confirm to all requirements of
NFLAC, conducted under NPLAC Certification Number E87K19
Florida Dept. of Health. Included results pertain only to provided samples.
Patrick D. Timms
QA/QC Officer
SCDHEC Certification #23104
NCDENR Certification # 022
Page 2 of 7
Page 1 of fi

aceAnalXical
www.paeelaba.enm
Laboratory Report
Doug Shoutd
City of Mt Holly WWTP
201 Broome Street
Mount Holly, NC 28120
Project: Toxicity - NCO021156 - Multico
Pace Project No.: 92590528
Reviewed by:
Sarah Graham
[phone]
[e-mail]
Pace Analytical Services, LLG
9800 Kincey Ave. Suite 100
Huntersville, NC 28078
[phone]
Page 1 of 1
Report Date: 02/28/2022
Date Received: 02/28/2022
Page 1 of 7

Effluent TOXICIty Report corm-unronic ratneaa minnow
Facility: Mount Holly WWTP
Laboratory:
x fir+
Signature of Operator in R ponsible Charge
x
Signature of Laboratory Supervisor
NPDES # NCO021156
Pipe #: 001 County, Gaston
Comments
MAIL ORIGINAL TO: Environmental Sciences Branch
Division of Water Quality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
Test Initiation Daterrime
02/09/22
1 04:15 PM
% Eff. Repl.
1
2
4
Control Surviving #
10
10
10
3.0 Surviving #
Original #
Wtloriginal (mg)
4.5 Surviving #
Original #
Wtloriginal (mg)
6.0 Surviving #
Original #
Wt/original (mg)
Avg WtlSurv. Control 0.6941
4
10
10
10
10
10
10
10
10
0.5900
0.8280
1 0.6360
0.7$30
10
9
10 10
10
10
10 10
0.6120
1 0.6490
0.7740 0.7360
10
10
9
10
10
10
10
10
0.6450
0.6860
0.6350
0.6800
9,0 Surviving #
10
10
10
9
Original #
10
10
10
9
Wt/original (mg)
0.7780
0.6830
0.7660
0.8044
12.0 Surviving #
10
10
10
to
Original #
10
10
10
10
Wtloriginal (mg)
0.7270
0.7340
0.8940
0.8530
% Survival 97.5%
Avg Wt (mg) 0.6755
Survival 100.0%
Avg Wt (mg) 0.7093
% Survival 97.5°1a
Avg Wt (mg) 0.6928
% Survival 97.50/6
Avg Wt (mg) 0.6615
Survival 10D.0%
Avg Wt (mg) 0.7579
a Survival 100.0%
Avg Wt (mg) 0.8020
Test Organisms
Cultured In -House
X Outside Supplier
Hatch Date: 02/08122
Hatch Time: 12:00 AM
Water Quality Data
Day
._
Control
0
1
2
3
4
5
6
7
pH (SU) InitlFin
DO (mglL) InitlFin
Temp (C) InitlFin
High Concentration
pH (SU) inii/Fin
DO (mglL) InitlFin
Temp (C) InitlFin
7.8
1 --
7.8 1
7.7
7.8 !
7.9
7.8
! 8.0
7.8
1 7.7
7.8
1 7.5
7.8
I 8.4
---- !
7.5
7.7
1 --
8.1 1
6.7
8.0 !
7.2
7.9
! 6.8
7.6
1 6.7
8.0
1 5.8
7.7
! 6.4
---- !
6.4
24.7
1 -
24.7 1
24.4
24.5 !
24.6
24.5
! 24.8
24.5
! 25.3
24.6
1 24.9
24.5
! 25.3
---- 1
24.9
n 1 2 3 4 5 6 7
7.8 1
- 7.9
1 7.6
7.8 1
7.7
8.0
1 -1.8
8.0
! 7.7
7.9 !
7.5
1 8.2 1
7.9
- 1
8.0
7.9 ! -
7.8
1 6.5
7.9 1
6.6
7.9
1 6.8
8.1
1 6.8
8.0 1
5.8
1 7.7 1
6.2
-- 1
6.3
25.0 1 --
25.1
1 24.4
24.7 1
24.6
24.6
1 24.8
24.7
/ 25.3
124.8 1
24.9
24.7 1
25.3
---1
24.9
Sample 1 2
Collection Start Date
Grab
Composite (Duration)
Hardness (mg1L)
Alkalinity (mg1L)
Conductivity (umhoslcm)
Chlorine(mglL)
Temp at Receipt ( C)
Dilution H2O
Hardness (mglL)
81.6
Alkalinity (mglL)
60.3
Conductivity (umhoslcm)
305
Survival
Growth Overall Result
Normal
no
es ChV
Hom. Var.
es
yes
NOEC
12.0%
12.0%
LOEC
>12.00%
>12,00%
ChV
>12.00%
>12.00%
Method
Steel's Test
T-Test
Stats
Survival
Conc.
Critical
Calculated
3%
10.00
20.00
5%
10.00
18.00
6%
10.00
18.00
9%
10.00
20.00
129k
10.00
20.00
Growth
Critical
Calculated
2.41
-0.64
2.41
-0.33
2.41
0.27
2.41
-1.57
2.41
-2.41
- W , „,„' ,, , i =v Page 2 of 6

Day 1 I Day 2 1 Day 3 Day 4 ❑ay 5 Day 6 Day 7 Weght Fecundky
source rep sad Losl esd Lnal sae �.,.� r,
Mal
i� ��
��
1•r
ttt�tttttr
��
r_�
�_
Tfi1222 P promelas
Mount Holly
WWTP
INMPDESO
NC0021156Gaston2
09-Feb-22
Start & fed Time
04:15 PM
Startetl 8 fed By
AM
Test Organism
Pimephales promela
Nee. born date
08-Feb-22
Nao. born time
1500-1630
Test Type
NC
Dilution Water
MH5F
Units for Cone.
%3rd BROOD
Test vessels
400 ml
Test volume
150 ml
181t18dk
°C
E
25
0,1 at2xlda
EPA B21-R-02-ot3:i006
Page 3 of 6
Page 4 of 7

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Page 4 of 6

AN

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41.

ETa6vmwmT,nc. ( ) 877-6942 . FAX �864) 877-693a
P.C. Sex 18414, Greenville- SC 29606 4 Craftsman Court. Greer. SC 2966U
Fathead Minnow Survival and Growth Test
EPA-821-R-02-013 Method 1000
Client: Mount Holly
Facility: WWTP
NPDES #: NCO021156
Test Date: 16-May-23
Laboratory Sample ID #: T64852 P promelas
Test Reviewed and Approved By:
/ 1 'mac --P• o" ,,,...-i
Robert W. Kelley, Ph.D. Patrick Tlmms
Lab Manager QA/QC Officer
Certification #E87819 SCDHEC Certification #23104
Test results presented in this report conform to all requirements of
NELAC, conducted under NELAC Certification Number E87819
Florida Dept. of Health. Included results pertain onlyto provided samples. NCDENR Certification # 022
Page 1 of 7

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test
Facility: Mount Holly NPDES # NCO021156 Pipe #: 001 County: Gaston
Laboratory: Comments
x
Signature of Operator in Responsible Charge 6 /4
x W
Siqnature of Laboratory Supervisor
MAIL ORIGINAL TO: Environmental Sciences Branch
Division of Water Quality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
Test Initiation Date/Time
05/16/23
/ 03:00 PM
Avg Wt/Surv. Control 0.7955
Test Organisms
Eff.
Repl.
1
2
4
4
Cultured In -House
control
Surviving #
10
10
9
9
% Survival
100.0 %
El
Outside Supplier
Original #
10
10
9
9
0.7470
0.8040
0.7044
0.9267
10
10
9
10
4.5
Surviving#
%Survival
100.0%
Original #
Wt/original (mg)
Avg Wt (mg)
0.7089
6.0
Surviving #
%Survival
97.5
Original #
WUoriginal (mg)
Avg Wt (mg)
0.6683
9.0
Surviving#
%Survival
100.0%
Original #
WUoriginal (mg)
Avg Wt (mg)
0.8351
12.0
Surviving #
%Survival
97.4
Original #
Wt/original (mg)
Avg Wt (mg)
0.8574
Water Quality Data
Day
Control
0
1
2
3
4 5
6
7
pH (SU) IniUFin
DO (mg/L) IniUFin
Temp (C) Init/Fin
High Concentration
0
1
2
3
4 5
6
7
10
10
9
10
10
10
9
10
0.6610
0.7000
0.7656
0.7090
9
10
10
10
10
10
10
10
0.5860
0.7030
0.7090
0.6750
10
9
10
9
10
9
10
9
0.6280
0.9867
0.9100
0.8156
9
10
9
9
10
10
9
9
0.7850
0.8990
0.8622
0.8533
7.8
/ --
7.8
/ 7.5
7.8
/ 7.5
7.7
/ 7.5
7.7 /
7.5
7.8 /
7.4
7.8 /
7.5
----/
7.9
7.2
/ --
7.7
/ 5.8
7.5
/ 6.0
7.5
/ 6.2
7.6 /
6.7
7.7 /
5.8
7.8 /
5.8
----/
7.0
24.6
I -
24.5
/ 25.7
24.7
/ 25.5
24.5
/ 24.7
24.5 /
25.2
24.7 /
25.7
24.6 /
25.8
--- /
25.2
pH (SU) IniUFin
DO (mg/L) IniUFin
Temp (C) Init/Fin
Sample
1
2
Survival
Growth
Overall Result
Collection Start Date
05/14/23
05/16/23
05/17/23
Normal
0.61
0.95
ChV > 12
Grab
Hom. Var.
inf
8.43
Composite (Duration)
24 hr
24 hr
24 hr
NOEC
12.0%
12.0
Hardness (mg/L)
0.0
0.0
0.0
LOEC
> 12.0% >
12.0%
Alkalinity (mg/L)
0.0
0.0
0.0
ChV
> 12.0% >
12.0
Conductivity (umhos/cm)
612
522
554
Method
Rank Sum
t Test
Chlorine(mg/L)
<0.05
554
Temp at Receipt (C)
2.3
0.8
0.5
Stets
Survival
Growth
C 011C.
Critical
Calculated
Critical
Calculated
Dilution H2O
3%
10.00
18.00
2.40
1.41
Hardness (mg/L)
84.0
5%
10.00
18.00
2.40
1.46
Alkalinity (mg/L)
58.0
6%
10.00
16.00
2.40
2.14
Conductivity (umhos/cm)
313
9%
10.00
18.00
2.40
-0.66
12 %
10.00
20.00
2.40
-1.04
7.7
7.7
/ 7.4
7.8
/ 7.5
7.7
/ 7.3
7.6 /
7.3
7.8 /
7.5
7.8 /
7.5
---- /
7.8
7.5
/ --
7.8
/ 6.2
7.7
/ 6.1
7.7
/ 6.1
8.3 /
6.6
7.8 /
6.3
7.7 /
6.5
---- /
7.2
25.0
/ --
25.2
/ 25.7
24.8
/ 25.5
24.7
/ 24.7
24.8 /
25.2
25.2 /
25.7
25.0 /
25.8
---- /
25.2
DWO Form AT-5 (1/04)
Page 2 of 7

CHRONIC DEFINITIVE SURVIVAL AND REPRODUCTION/GROWTH TEST
Statistical Analyses
Client: T64852 P promelas
Sample Identification: Mount Holly WWTP
Test Date: 16-May-2023
ests for Normality and Heterogeneity of Variance (Growth)
zrameter
Test Used
Value Result
ormality (Growth)
Shapiro Wilks
0.952 normal
ariance (Growth)
Bartletts
8.43 homogeneous
ormality (Survival)
Shapiro Wilks
0.614 not normal
ariance (Survival)
Bartletts
inf not homogene
ests for Differences in Survival and Reproduction
Type Used: Linear Interpolation
Test Concentration % effluent
Test Species: Fathead Minnow
Sample Use
Sample Date Sample Used
A 15-May-23 16-May-23 17-May-23
B 17-May-23 18-May-23 19-May-23
C 19-May-23 20-May-23 21-May-23 22-May-23
Effect Control
1 3.01
4.51
6.01
9.01
12.0
Survival 100.0%
100.0%
100.0%
97.5%
100.0%
97.4%
% reduction
1
0.0%
0.0%
0.0%
0.0%
0.0%
Growth (Av. wt) 0.7955
0.7115
0.7089
0.6683
0.8351
0.8574
mg
% reduction (smoothed)
4.9%
4.9%
4.9%
4.9%
4.9%
Variance 0.0093
0.0015
0.0019
0.0032
0.0240
0.0026
A Criteria Value Upper Limit Lower Limit
V:Coeff. of Variation
12.1%
42.0%
8.9%
qSD: % MSD
17.6%
9.4%
35.0%
SD:Min. Sign. Diff.
0.140 Acceptability criteria limits not exceeded
;'25 Point Estimate
TEST RESULTS
eproduction IC25=
>
12.0%
%Reduction per Linear Interpolation
hV & NOEC Using 25% Limit
CTC of
6.0%
OEC Survival
12.0
%
Survival effect
0.0%
OEC Growth
12.0
%
Growth effect
4.9%
hV Growth
>12.0
%
PASS
ChV &
NOEC Usin
ANOVA
Test
Concentration
Comments:
Endpoint
3
4.5
6
9
12
critical
I ChV
NOEL
t Test
Growth
1.41
1.46
2.14
-0.66
-1.04
2.40
12.0%
12.0%
Outcome
Growth
PASS
PASS
PASS
PASS
PASS
Rank Sum
Survival
18.00
18.00
16.00
18.00
20.00
10.00
>12.0%
12.0%
Outcome
Survival
PASS
PASS
PASS
PASS
PASS
Page 3 of 7

®m...
...
...
,..
...
....
,..
NMI
oria
10
10
9
9
10
10
9
10
10
10
9
10
10
10
10
10
10
9
10
9
10
10
9
9
Lab#
T64852 P promelas
Client
Mount Holly
Sample ID
WWTP
NPDES#
NCO021156
County
Gaston
Month
5
Start & fed Date
16-May-23
Start & fed Time
03:00 PM
Started & fed By
JG
Test Organism
Pimephales promelas
Neo. born date
15-May-23
Neo. born time
1500-1630
Test Type
NCCD
Dilution Water
MHSF
Units for Cone.
%
%3rd BROOD
Test vessels
400 ml
Test volume
250 ml
Incubator#
1
Light
161t/8dk
Eff. Init. Temp °C
25.0
Feeding w/ Artemia
.15g xDAY
Test method
EPA.21-R-02-013:1000
Comments
All reps have 10
organisms unless noted otherwise.
-ontrol ini to
& 64852 SHARE A CONTROL
D=Dead N/A -Lost or not used
Page 4 of 7

CHAIN OF CUSTODY RECORD
Page of
CIient: City of Mt HollyVWI TP
Program
Containers
Preservative
Parameters
Facility:
Whole filaoatTosieity
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-------------
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Special Instructions:
Sample Custody Transfer Record
Secure
Receipt
Sample
Date 'lime Relit u' ed B / Orttanization—Received BA/ Orwitization
Area
rem eC
Preserved?
I
Al s� a
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COMPOM SAMPLING PROCEDURES
TEAMEWIVRE MONMUNG PROCEDURES
HOLD TlMEPROCEDURES
Composite samples must be collected over a 24 hour period.
Sample temperatum during collection and transport must be between
For toxicity testing die sample must first he used xdthin 36 hours
Time Proportional: I sample each hour far24 hours. Equal volur
0.0 and 6.0 °C. Samples must not be frozen. Use Avatar lea in sealed bags.
ofsample collection (completion of eamposite sample).
or at minimum I sample every 4 hours over24Iiours.
Sample may not be used after 72 hours fmm sample collection.
Miv Proportional: As per instructions in NPDES permit
Page 5 of 7

CHAIN OF CUSTODY RECORD
t C-ETR) `- ill'
PQ Sox 16414. Gmermlle, SC 28606-7414
[phone], (600) 091-2a25 FaX[phone]a
Slffpping Address: 4 Cransmert Ct, Greer, $C 29650
W W W.GfTCNVIRaNMCMAI.COM
Page —,—of 771
Client: City of Mount HollyVWVTP
Program
Containers
Prescrvalive
Parameters
racillty:
WlON tnuentibsreky
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State: NC N['Alas#: NC0021156
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Date lime Relinquished By I Oization --4kficeiveav I omnization
Area
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COMPOSITIs SrihIPLING PROCEDURES
TEMPERATURE MOArlTORING PROCEDURES
HOLD TIME PROCEDURES
Composite samples must be collected over a 24 hour period.
Sample temperature during collection and transport must be benvicett
For toxicity testing the sample must first be used mithin 36 hours
Time Proportional: 1 Sample each hour for24 hours. Equal volui
0.0 and 6.0 °C. Samples must not be frozen. Use waler ice in sealed bags.
of sample collection (completion of composite sample).
or at minimum 1 sample every 4 hours over24 hours.
Sample may not be used after 72 hours from sample collection.
Plow Proportional: As per instructions in WPDES Permit.
Page 6 of 7

Page 1 of 1
PO Box 16414, Greenville, SC 2BMr,7414
[phone], [phone] Fa5c(864) B77 6939
Shippinn Address: 4 Cransman Ct, Greer, SC 29650
WV/%v-r Q4vfno NMCNTAL.CnM
Client:
City of Mount Holly WWTP
Prngrnin
Containers
t'resmEtivc
Parameters
Facility:
11'llo[c Cmaeat Tazirity
p
State: NC NPDESn: NCO021156
Acute
Chmnlc
Test Organisms
(Campnsitenoy)
(Grab er Comppsilc)
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Date 11me Relinquished By 1 Organization Received B 1-Ormiimtian
Area
Tens °C
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COMPOSITE SAMPLING PROCEDURCS
TEMPERATURE HORITONA'G PROCEDURES
HOLD TIA19 PRDC, DUKES
Composite samples must be collected over a 24 hour period.
Sample temperature during collection and transport must be between
For toxicity testin-- the sample must first be used 1Vlthin 36 ]tours
Time Proportional: 1 sarnpie eaelt hour for24 hours. Equal volui
0.0 and 6,0 IC, Samples nru5t not be frozen. Use water ice in sealed bags.
afsainplc collection (completion of composite sample),
or at minimum 1 sample every 4 hours over 24 [touts.
Sample may not be used after 72 hours from sample col[ection,
Flow Pro ortionol: As per instructions in NPDES permiL
Page 7 of 7

Process Narrative
Wastewater from the City of Mount Holly Residents, Businesses, and Industries flow by gravity through
approximately 130.76 miles of sewer lines, through approximately 2,600 manholes, to one of 14 lift
stations. The Wastewater then flows to the City of Mount Holly's Wastewater Treatment Facility where
it is then treated. When the wastewater enters the facility, it is screened to remove any large debris.
After screening the wastewater flows by gravity through 2 (two million gallon) aeration basins which is
where the biological portion of the treatment occurs. In the biological process tiny microscopic bacteria
and organisms treat the wastewater and oxygen is added. After aeration the wastewater flows to two
75 ft diameter secondary clarifiers where the wastewater is slowed down and the biological organisms
are separated from the water by gravity. After clarification a portion of the biological organisms are
Returned back to the beginning of the process and met with incoming flow to continually keep a healthy
environment. Through process control testing the operator determines the desired waste rate to be
pumped into two 750,000 gallon digesters where it is aerobically digested prior to Land Application on
farm land for the re -use of the nutrients. The treated water leaves the clarifiers and flows into two 35ft
diameter chlorine contact basins where the water is met with chlorine for disinfection purposes.
Through detention time inside the tank any remaining bacteria has been killed by the chlorine the
treated water flows through sulfur dioxide to remove the residual chlorine prior to discharge into the
Catawba River.

OV
z

MT. HOLLY SLUDGE
MANAGEMENT PLAN
Mt. Holly waste sludge to (2) 750k holding tanks that serve as storage and aeration of
biosolids. These tanks are frequently decanted to remove excess water and to thicken
sludge, generally to about 3% concentration. Synagro is our contracted sludge hauler that
delivers the sludge to the farmers where it is land applied. The sludge is processed in the
same tanks for vector reduction and pathenogenic destruction. It will be analyzed for
complete digestion and lime stabilized when needed before hauling. Our Land
Application Permit # WQ 0001863 which includes schematics for land being applied to is
available at the waste treatment plant located at 201 Broome Street, Mt. Holly, N.C.

EPA Identification N,,b,,
NPDES N,,b,,
F.dliW N.— owamml
Mount H.IIV
P.11.—t Re W
Method N.—,
(if Applicable)
-
R,,,,, P,11,t,,t Believed P-- m Dis,h,
Estimated C.—t-im, (if
Knpw
Al Ih ttI..t,1," Mount
' ...... ddltl,=,ZM
I

A 13 C D I E F I G I H I J K L M N O 1 P
NPDES/PT POC Review Form Version: 2022.06.22
2
1. Facility's General Information
3
Data of (draft) Review
1/3/2024
c. POC review due to:
e. Contact Information
4
Data of (final) Revie+v
Municipal NPDES renewal
❑
Regional Office (RO) Mooresville
6
NPDES PermitWriter (pw)
Gary Perlmutter
HWA-AT/LTMP Roview
ElRO
PT Staff Was Bell RO NPDES Staff Was Bell
Permitlee-Facility Name
Mount Holly W WTP
New Industries
❑
Facility PT Staff, email Nadine Blackwell <nadine.blackwell(dsuez.com>
6
7
NPDES Permit Number
NCO021156
WWTP expansion
❑
f. Receiving Stream
8
NPDES Permit Effective Date
Stream reclasedadjustment
❑
Outfall
9
Chemical Addendum Submittal Data
Omfell relocationladjustment
❑
Receiving Stream:
CA, cfs:
10
NPDES Permit Public Notice Dete
7010 update
❑
Stream Class
7Q10 (S), cts:TOO
eDMR data evaluated from:
to
Other POC review trigger, explain:
Oufall Lat.
Outfall Long.
11
12
a. W WTP Capacity Summary
Outfall 11
3
Current Permitted Floa, mgd
4.0 Designm: gn d Fes'' 4.0
Receiving Strea
CA, cfs:
14
Permitted SIU Flov, mgd
1.73
d. IU Summary
Stream Class
7010, cfs:
15
b. PT Docs. Summary
# lus
oufall Let.
Ouffall Long.
16
IWS approval date
8/10/2022
#SIUs
Is there a PWS downstream of the Facility's Cull ❑ YES ❑ NO
17
3 L/STMP approval date:
5/4/2016
#CIUs
Comments:
18
.E
If NSCIUs
d HWA approval date
6/24/2019
If IUs w/Local
m
Permits or Other
9
0
Types
20
Z 2. Industrial Users' Information.
21
#
Industrial User (IU) Name
IU Activity
IU Non Conventional Pollutans 8 Toxic Pollutant
IUP Effective Dete
22
1
American 8 Efird, LLC
textile
Flaw, BOD, CBOD, TSS, COD, Temperature, pH, Ammonia, TN, TP, Sib, As, Cd, Cr, Cu, ON, Pb, Hg, Mo, Ni, Be, Ag, TTO, Zn
1 112024
23
2
Clariant
Organic
Chemicals, etc
Flow, BOD, CBOD, TSS, COD, Temperature, pH, Ammonia, TN, TP, Sit, As, Cd, Cr, Cu, ON, Pb, Hg, Mo, Ni, Se, Ag, TTO, Zn
1 1 /2023
24
3
Daimler Trucks North America LLC
Metal Finisher
Flay, BOD, CBOD, TSS, COD, Temperature, pH, Ammonia, TN, TP, Sib, As, Cd, Cr, Cu, ON, Fib, Hg, Mo, Ni, Se, Ag, TTO, Zn
1l1/2024
25
4
26
s
CammenL Georgia Pacific IUP terminated
in 1118.
31
32
II 3. Status of Pretreatment Program (check all that apply)
33
Status of Pretreatment Program check all that apply)
34
❑
1) facility has no SIUs, does have Division approved Pretreatment Program that
is INACTIVE
35
❑
2) facility has no SIUs, does not have Division approved Pretreatment Program
36
❑
3) facility has SIUs and DWQ approved Pretreatment Program
37
❑
3a) Full Program with LTMP
38
❑
31b) Modified Program with STMP
39
❑
4) additional conditions regarding Pretreatment
attached
or listed
below
4o
❑
5) facility's sludge is being land applied or composted
41
❑
6) facility's sludge is incinerated (add Beryllium and Mercury sampling according
to § 503.43)
❑
7) facility's sludge is taken to a landfill,
if yes which landfill:
43
❑
8) other
d42
44
Mt. Holly waste sludge to (2) 750k holding tanks that serve as storage and aeration of biosolids. These tanks are frequently decanted to remove excess water and to thicken sludge, generally to about 3 % concentration. Synagro
45
Sludge Disposal Plan:
is our contracted sludge hauler that delivers the sludge to the farmers where it island applied. The sludge is processed in the same tanks for vector reduction and pathenogenic destruction. It will be analyzed for complete
46
digestion and lime stabilized when needed before hauling for land application.
47
1 Sludge Permit No:
W00003417
Page 1 21156 POC Review Form

A 6 I C D I E F G H I J K I L I M N O P
48
4. LTMP/STMP and HWA Review
49
PW: Find L/STMP document, HWA spreadsheet, DMR, previous and new NPDES permit for next section.
50
51
a
�Comment
N�
U
n
Parameter of Concern
POC Check List
New
NPDES
POC
Previous
NPDES
POC
Required by
EPA PT(1)
POC due to
Sludge 2
POC due to
SIU 3
POTW
POC 4
L/STMP
Effluent Freq
NPDES
Effluent Freq
PQLs review
%
Removal
Rate
PQL from
L/STMP, ug/I
Required PQL
per NPDES
permit
Recomm.
PQL, ug/I
52
0
Flow
❑
❑
❑
❑
53
❑
BOD
Li
❑
El
❑
Quartcrly
2 mg/L
54
❑'
TSS
❑
2 mg/L
55
O
NH3
❑
❑
0
❑
Quartedy
100.o
56
❑'
Arsenic
❑
❑
0
❑
❑
Quarterly
10.0
2.0
Reduce PQL to recommended
57
❑
Barium
❑
❑
❑
❑
❑
58
❑
Beryllium(5)
❑
❑
❑
❑
❑
59
0
Cadmiumi
❑
❑
0
❑'
❑
❑
Quarterly
2.0
0.5
Reduce PQL to recommended
60
0
Chrortlium(1)
❑
❑
❑i
Q
❑
Quarterly
5.0
10.0
61
0
copplii
❑
❑
El
o
❑i
❑
Quarterly
2.0
2.0
62
0
Cyanide
❑
❑
❑
Q
❑
Quarterly
10.0
63
❑
Lead(1)
❑
❑
❑
0
❑i
❑
Quarterly
10.0
2.0
Reduce PQL to recommended
64
❑'
Mercury(5)
❑
❑
❑'
❑
❑
Quarterly
1 ng/L
0.001
65
0
Molybdenum
❑
❑
❑+
❑
❑
Quarterly
100.0
10.0
Reduce PQL to recommended
66
❑'
Nickel(1)
❑
❑
0
❑+
El
❑
Quarterly
10.0
So
Reduce PQL to recommended
67
0
Selenium
❑
❑
o
o
❑
Quarterly
10.0
68
❑'
Silver
❑
❑
❑
❑'
❑
Quarterly
5.0
1.0
Reduce PQL to recommended
69
0
Ziri
❑
❑
❑'
❑+
❑
Quarterly
10.0
10.0
70
0
Sludge Flow to Disposal
❑
❑
Quarterly
71
O
% Solids to Disposal
0
❑
❑
Quarterly
72
❑
Oil S Grease
❑
❑
73
❑
TN
❑
❑
❑
❑
Quartedy
10a0
74
❑'
TP
❑
❑
❑
❑
Quarterly
10.0
75
❑
❑
❑
❑
❑
76
❑
❑
❑
❑
❑
77
❑
❑
❑
❑
❑
78
❑
❑
❑
❑
❑
79
❑
❑
n
❑
❑
8077
❑
❑
❑
❑
81
❑
❑
❑
❑
❑
82
Footnotes:
83
(1) Always in the LTMP/STMP due to
EPA -PT requirement
84
(2) Only in LTMP/STMP if listed in sludge permit
85
(3) Only in LTMP/STMP while SIU still discharges to POTW
86
(4) Only in LTMP/STMP when pollutant is still of concern to POTW
87
(5) In LTMP/STMP, R sewage sludge is incinerated
88
Please use blue foal, for the info updated by P.
89
Please use red font for POC that need to be addedlmodeled In L/STMP
sampling
plan
90
g1I
Blue shaded cell (D60:1182): Parameters usually included under that POC list
92
93
Facility Summary/background information/NPDES-PT regulatory action:
POC to be added/modified In L/STMP:
94
95
gg
97
ORC's comments on IU/POC:
POC submitted through Chemical
Addendum or Supplemental Chemical
Datasheet:
Additional pollutants added to L/STMP due
to POTWs concerns:
NPDES pw's comments on IU/POC.
g8
6. Pretreatment updates in response
to NPDES permit renewal
gg
NPDES Permit Effective Data 180 days after effective (date): I I Permit writer, please add list of required/recommended PT updates in NPDES permit cover letter.
Page 2 21156 POC Review Form

NORTH CAROLINA 2022 303(D) LIST
Upper Catawba Catawba River Basin
AU Name AU Number Classification AU_LengthArea AU —Units
AU ID Description
Catawba River Basin 03050101 Upper Catawba
CATAWBA RIVER (Mountain Island Lake below 11-(114) WS-IV,B;CA 1,937.6 FW Acres
elevation 648)
311 From Water Intake at River Bend Steam Station to Mountain Island Dam (Town of Mount Holly water
supply intake)
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
PCB Fish Tissue Advisory (Advisory, FC, NC) 5 Exceeding Criteria DHHS Fish Consumption Advisory 2012
CATAWBA RIVER (Lake Wylie below elevation 570) 11-(117) WS-IV;CA 375.4 FW Acres
312 From Mountain Island Dam to Interstate Highway 85 Bridge at Belmont
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
PCB Fish Tissue Advisory (Advisory, FC, NC) 5 Exceeding Criteria DHHS Fish Consumption Advisory 2014
CATAWBA RIVER (Lake Wylie below elevation 570) 11-(122) WS-IV,B;CA 601.2 FW Acres
313 From 1-85 bridge to the upstream side of Paw Creek Arm of Lake Wylie, Catawba River
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
PCB Fish Tissue Advisory (Advisory, FC, NC) 5 Exceeding Criteria DHHS Fish Consumption Advisory 2014
CATAWBA RIVER (Lake Wylie below elevation 570) 11-(123.5)a WS-V,B 3,238.4 FW Acres
North Carolina portion
314 From the upstream side of Paw Creek Arm of Lake Wylie to North Carolina -South Carolina State Line
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
PCB Fish Tissue Advisory (Advisory, FC, NC) 5 Exceeding Criteria DHHS Fish Consumption Advisory 2014
CATAWBA RIVER (Lake Wylie South FK Catawba Arm) 11-(123.5)b
North Carolina portion
12954 South Fork Catawba River Arm of Lake Wyly
PARAMETER IR CATEGORY CRITERIA STATUS
Turbidity (25 NTU, AL, FW acres & SW) 5 Exceeding Criteria
PCB Fish Tissue Advisory (Advisory, FC, NC) 5 Exceeding Criteria
Copper (7 µg/I, AL, FW)
5 Exceeding Criteria
WS-V, B
1,054.6 FW Acres
REASON FOR RATING 303D YEAR
2018
DHHS Fish Consumption Advisory 2014
Legacy Category 5 Total Metals 2008
Assessment
6/7/2022 NC 2022 303d List- Approved by EPA 4/30/2022 Page 27 of 192

MONITORING REPORT(MR) VIOLATIONS for:
Report Date:
01/11/24 Page
42 of 43
Permit:
NCO021156
MRS Betweel
1 - 2019 and12 - 2023
Region:
%
Violation Category:%
Program Category: %
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO021156
FACILITY: City of Mount Holly -Mount Holly WWTP
COUNTY: Gaston
REGION: Mooresville
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
10 - 2023
001
Effluent
Chlorine, Total Residual
10/17/23
5 X week
ug/I
28
34
21.4
Daily Maximum
No Action, BPJ
Exceeded
10 - 2023
001
Effluent
Chlorine, Total Residual
10/19/23
5 X week
ug/I
28
34
21.4
Daily Maximum
No Action, BPJ
Exceeded
10 - 2023
001
Effluent
Chlorine, Total Residual
10/24/23
5 X week
ug/I
28
36
28.6
Daily Maximum
No Action, BPJ
Exceeded
10 - 2023
001
Effluent
Chlorine, Total Residual
10/27/23
5 X week
ug/I
28
34
21.4
Daily Maximum
No Action, BPJ
Exceeded
10-2023
001
Effluent
Chlorine, Total Residual
10/31/23
5Xweek
ug/I
28
32
14.3
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/02/23
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/13/23
5 X week
ug/I
28
34
21.4
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/15/23
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/16/23
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/29/23
5 X week
ug/I
28
30
7.1
Daily Maximum
No Action, BPJ
Exceeded
11 -2023
001
Effluent
Chlorine, Total Residual
11/30/23
5 X week
ug/I
28
30
7.1
Daily Maximum
No Action, BPJ
Exceeded
07-2022
001
Effluent
Coliform, Fecal MF, MFC
07/23/22
5 X week
#/100ml
400
487.36
21.8
Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
08-2022
001
Effluent
Coliform, Fecal MF, MFC
08/20/22
5 X week
#/100ml
400
839.04
109.8
Weekly Geometric Mean
Proceed to
Broth, 44.5 C
Exceeded
Enforcement Case
08-2022
001
Effluent
Coliform, Fecal MF, MFC
08/31/22
5 X week
#/100ml
200
277.17
38.6
Monthly Geometric Mean
Proceed to
Broth, 44.5 C
Exceeded
Enforcement Case
12-2022
001
Effluent
Coliform, Fecal MF, MFC
12/31/22
5 X week
#/100ml
400
2,419
504.7
Weekly Geometric Mean
Proceed to
Broth, 44.5 C
Exceeded
Enforcement Case
10-2019
001
Effluent
Nitrogen, Total - Quantity
10/31/19
See Permit
lb/season
64,200
64,279.03
0.1
Annual Load Exceeded
No Action, BPJ
Seasonal

MONITORING REPORT(MR) VIOLATIONS for:
Report Date:
01/11/24 Page
43 of 43
Permit:
NCO021156
MRS Betweel 1 - 2019 and12 - 2023
Region:
%
Violation Category:%
Program Category: %
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO021156
FACILITY: City of Mount Holly -Mount Holly WWTP
COUNTY: Gaston
REGION: Mooresville
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT VALUE Over
VIOLATION TYPE
VIOLATION ACTION
06-2019
001
Effluent
Oxygen, Dissolved (DO)
06/10/19
5 X week
mg/I
5 0.3 94
Daily Minimum Not
Proceed to NOD
Reached
11 -2020
001
Effluent
Oxygen, Dissolved (DO)
11/12/20
5 X week
mg/I
5 4.6 8.0
Daily Minimum Not
Proceed to NOD
Reached
11 -2020
001
Effluent
Oxygen, Dissolved (DO)
11/13/20
5 X week
mg/I
5 0.08 98.4
Daily Minimum Not
Proceed to NOD
Reached
05 - 2020
001
Effluent
Solids, Total Suspended -
05/02/20
5 X week
mg/I
45 46.03 2.3
Weekly Average
Proceed to NOV
Concentration
Exceeded
05 - 2020
001
Effluent
Solids, Total Suspended -
05/09/20
5 X week
mg/I
45 50.2 11.6
Weekly Average
Proceed to NOV
Concentration
Exceeded
05 - 2020
001
Effluent
Solids, Total Suspended -
05/31/20
5 X week
mg/I
30 33.33 11.1
Monthly Average
Proceed to NOV
Concentration
Exceeded
Monitoring Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT VALUE Over
VIOLATION TYPE
VIOLATION ACTION
09 - 2020
001
Effluent
Chlorine, Total Residual
09/26/20
5 X week
ug/I
Frequency Violation
No Action, BPJ
07 -2023
001
Effluent
Coliform, Fecal MF, MFC
07/08/23
5 X week
#/100ml
Frequency Violation
No Action, Facility
Broth, 44.5 C
Reporting Error
09 -2023
001
Effluent
Coliform, Fecal MF, MFC
09/09/23
5 X week
#/100ml
Frequency Violation
No Action, Facility
Broth, 44.5 C
Reporting Error
12-2020
001
Upstream
Hardness, Total (as CaCO3)
12/31/20
Quarterly
mg/I
Frequency Violation
No Action, BIMS
Calculation Error
12-2021
001
Upstream
Hardness, Total (as CaCO3)
12/31/21
Quarterly
mg/I
Frequency Violation
No Action, BIMS
Calculation Error
06-2022
001
Upstream
Hardness, Total (as CaCO3)
06/30/22
Quarterly
mg/I
Frequency Violation
No Action, BIMS
Calculation Error
07 - 2023
001
Effluent
Oxygen, Dissolved (DO)
07/08/23
5 X week
mg/I
Frequency Violation
No Action, Facility
Reporting Error
09 - 2023
001
Effluent
Oxygen, Dissolved (DO)
09/09/23
5 X week
mg/I
Frequency Violation
No Action, Facility
Reporting Error
11 -2022
001
Effluent
Solids, Total Suspended -
11/26/22
5 X week
mg/I
Frequency Violation
None
Concentration

Whole Effluent Toxicity Testing and Self Monitoring Summary
Motiva Enterprises LLC-Wake
NCO022217/001 County:
Wake
Fthd24Ac
Begin:
12/1/2013 ANNUAL: 24hr LC50 a
NonComp:
J
F M
A
M
2020
-
- -
-
>100
2021
-
2022
2023
Motiva Enterprises -Paw Creek
NCO022187/001 County:
Mecklenburg
Ceri24PF
Begin:
9/1/2015 Cerio 24 PF Lim @ 90
NonComp:
J
F M
A
M
2020
Pass
- -
Pass
-
2021
Pass
- -
Pass
-
2022
Pass
- -
Pass
-
2023
Pass
- -
Pass
-
MPLX - Charlotte Terminal
NCO046213/001 County:
Mecklenburg
Fthd24Ac
Begin:
11/1/2021 ANNUAL: 24hr Fthd A
NonComp:
J
F M
A
M
2020
>100
- -
-
-
2021
>100
- -
>100
-
2022
-
- -
>100
-
2023
-
>100 -
-
-
Mt. Airy WWTP
NCO021121/001 County:
Surry
Ceri7dPF
Begin:
11/1/2020 chr lim: 42%
NonComp: Single
J
F M
A
M
2020
Pass
- -
Pass
-
2021
Pass
- -
Pass
-
2022
Pass
- -
Pass
-
2023
Pass
- -
Pass
-
Mt. Gilead WWTP
NCO021105/001 County:
Montgomery
Ceri7dPF
Begin:
3/1/2005 chr lim: 3.2%
NonComp: Single
J
F M
A
M
2020
-
- Pass
-
-
2021
-
- Pass
-
-
2022
-
- Pass
-
-
2023
-
- Pass
-
-
Mt. Holly WWTP NCO021156/001 County: Gaston
Ceri7dPF Begin: 1/1/2007 chr lim: 6% NonComp: Single
J F M A M
2020 - Pass - - Pass
2021 - Pass - - Pass
2022 - Pass >12(P) - - Pass
2023 - Pass - - >12 Pass
Region: RRO Basin: NEU03 Mar Jun Sep Dec SOC JOC:
7Q10: 0.0 PF: N/A IWC: 100.0 Freq: A
J J A S O N
>100
>100
Region: MRO Basin: CTB34 Jan Apr Jul Oct SOC JOC:
7Q10: 0.0 PF: NA IWC: 100 Freq: Q
l J A S O N
Pass
- Pass - - Pass
- Pass - - Pass
- Pass - - Pass
Region: MRO Basin: CTB34 Mar Jun Sep Dec SOC JOC:
7Q10: 0.0 PF: VAR IWC: 100 Freq: A
J J A S O N
>100 >100
>100 >100
Region:
WSRO
Basin:
YAD03
Jan Apr Jul Oct
SOC JOC:
7Q10: 14.9
PF: 7.0
IWC: 42.0
Freq: Q
J
J
A
S
O
N
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass >100
-
-
Pass>100
-
Region:
FRO
Basin:
YAD10
Mar Jun Sep Dec
SOC JOC:
7Q10: 40
PF: 0.85
IWC: 3.2
Freq: Q
J
J
A
S
O
N
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Region:
MRO
Basin:
CTB33
Feb May Aug Nov
SOC JOC:
7Q10: 95.0
PF: 4.0
IWC: 6.0
Freq: Q
J
J
A
S
O
N
-
-
>24(P) Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
C
Cp
C
C
D
Pass
Pass
Pass
D
>12 (P)
Legend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Solit test between Certified Labs
Page 60 of 95

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 NCO021156 111 121 23/02/15 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 I r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
2.0 701d I 71 I„ I 72 I r., I 71 I 74 79 I I I I I I I80
L—I ty 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)
09:05AM 23/02/15
19/12/01
Mount Holly WWTP
165 Broome St
Exit Time/Date
Permit Expiration Date
Mount Holly NC 28120
12:30PM 23/02/15
24/02/29
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Douglas Eugene Shoutd/ORC/704-827-4261/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Miles Braswell,PO Box 406 Mt Holly NC 281200406/City Manager/704-827-3931/
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
Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Wes Bell DWR/MRO WQ/704-235-2192/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
Andrew Pitner DWR/MRO WQ/704-663-1699 Ext.2180/
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NCO021156 I11 12I 23/02/15 117 18 i c i
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Page#

Permit: NCO021156 Owner -Facility: Mount Holly WWTP
Inspection Date: 02/15/2023 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 City implements a Division -approved Industrial Pretreatment Program.
The construction activities are ongoing for a new pump station and piping system
to
convey all wastewater to th City of Charlotte's sewer system.
The last compliance evaluation inspection at this facility was performed by
DWR staff
on 5/11/2021.
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?
■
❑
❑
❑
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?
■
❑
❑
❑
Page# 3

Permit: NCO021156
Inspection Date: 02/15/2023
Owner -Facility: Mount Holly WWTP
Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Comment: The records reviewed durinq the inspection were organized and well maintained.
Discharge Monitoring Reports (eDMRs) were reviewed from January 2022 through
December 2022. Effluent fecal coliform violations were reported in July 2022 (weekly
average), August 2022 (weekly and monthly average) and December 2022 (weekly
average). The Division has separately addressed these limit violations through the
issuances of Notice of Violations (NOVs) and/or civil penalty assessments.
Applicable eDMRs will be revised and resubmitted to report the flows measured during
the holidays.
Laboratory
Yes
No
NA
NE
Are field parameters performed by certified personnel or laboratory?
■
❑
❑
❑
Are all other parameters(excluding field parameters) performed by a certified lab?
0
❑
❑
❑
# Is the facility using a contract lab?
0
❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
■
❑
❑
❑
degrees Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
❑
❑
■
❑
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
❑
❑
■
❑
Comment: The City's on -site certified laboratory (#215) performs TSS analyses (influent and
effluent) and all effluent field analyses (conductivity, dissolved oxygen, pH,
temperature, total residual chlorine). Pace Analytical Services, Waypoint Analytical and
ETT Environmental have also been contracted to provide analytical support.
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?
Comment: The subject permit requires influent BOD and TSS composite samples.
Effluent Sampling
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
■ ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Page# 4

Permit: NCO021156
Inspection Date: 02/15/2023
Owner -Facility: Mount Holly WWTP
Inspection Type: Compliance Evaluation
Effluent Sampling
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment: The subject permit requires composite and grab effluent samples.
Upstream / Downstream Sampling
Is the facility sampling performed as required by the permit (frequency, sampling type,
and sampling location)?
Comment:
Operations & Maintenance
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Yes No NA NE
■ ❑ ❑ ❑
Yes No NA NE
❑ ❑ ❑
❑ ❑ ❑
Comment: The wastewater treatment facility appeared to be properly operated and well
maintained. The ORC and staff incorporate a comprehensive process control program
with all measurements beina Drooerly documented and maintained on -site.
Bar Screens
Type of bar screen
a.Manual
b.Mechanical
Are the bars adequately screening debris?
Is the screen free of excessive debris?
Is disposal of screening in compliance?
Is the unit in good condition?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Comment: The facility is equipped with coarse bar screens at multiple locations. These screens
perform satisfactorily at removing the larger debris but the smaller screenings
accumulate in the equalization basin. The mechanical screen is not operational and
has been taken out of service due to continued operational issues.
Grit Removal Yes No NA NE
Type of grit removal
a.Manual
b.Mechanical ❑
Is the grit free of excessive organic matter? 0 ❑ ❑ ❑
Page# 5

Permit: NCO021156
Inspection Date: 02/15/2023
Owner -Facility: Mount Holly WWTP
Inspection Type: Compliance Evaluation
Grit Removal Yes No NA NE
Is the grit free of excessive odor? 0 ❑ ❑ ❑
# Is disposal of grit in compliance? 0 ❑ ❑ ❑
Comment: Screenings and any grit are disposed by Waste Management at a permitted landfill.
The facility staff should keep all dumpster lids closed and minimize the accumulation of
liquids inside the dumpsters to prevent any wastewater discharges from entering the
stormwater system during the emptying of the dumpsters' contents by the contracted
company.
Equalization Basins
Yes
No
NA
NE
Is the basin aerated?
❑
❑
■
❑
Is the basin free of bypass lines or structures to the natural
environment? 0
❑
❑
❑
Is the basin free of excessive grease?
0
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
■
❑
❑
❑
Are float controls operable?
0
❑
❑
❑
Are audible and visual alarms operable?
❑
❑
0
❑
# Is basin size/volume adequate?
0
❑
❑
❑
Comment: The equalization basin is equipped with a gravity
flow bypass to the aeration basin.
Aeration Basins
Yes
No
NA
NE
Mode of operation
Ext. Air
Type of aeration system
Surface
Is the basin free of dead spots?
■
❑
❑
❑
Are surface aerators and mixers operational?
0
❑
❑
❑
Are the diffusers operational?
❑
❑
0
❑
Is the foam the proper color for the treatment process?
■
❑
❑
❑
Does the foam cover less than 25% of the basin's surface?
0
❑
❑
❑
Is the DO level acceptable?
0
❑
❑
❑
Is the DO level acceptable?(1.0 to 3.0 mg/1)
E
❑
❑
❑
Comment: Two of the three aeration basins were in service. Each aeration basin is equipped with
four platform aerators (all operational). The third aeration basin has been taken out of
service for several years.
Secondary Clarifier
Yes
No
NA
NE
Is the clarifier free of black and odorous wastewater?
0
❑
❑
❑
Is the site free of excessive buildup of solids in center well of circular clarifier?
0
❑
❑
❑
Page# 6

Permit: NCO021156
Owner -Facility: Mount Holly WWTP
Inspection Date: 02/15/2023
Inspection Type: Compliance Evaluation
Secondary Clarifier
Yes
No
NA
NE
Are weirs level?
❑
0
❑
❑
Is the site free of weir blockage?
■
❑
❑
❑
Is the site free of evidence of short-circuiting?
0
❑
❑
❑
Is scum removal adequate?
0
❑
❑
❑
Is the site free of excessive floating sludge?
0
❑
❑
❑
Is the drive unit operational?
0
❑
❑
❑
Is the return rate acceptable (low turbulence)?
0
❑
❑
❑
Is the overflow clear of excessive solids/pin floc?
0
❑
❑
❑
Is the sludge blanket level acceptable? (Approximately'/4
of the sidewall depth) 0
❑
❑
❑
Comment: Both secondary clarifiers were in service. The clarifier weirs were not excessivel
unlevel and no short-circuiting was observed.
Pumps-RAS-WAS
Yes
No
NA
NE
Are pumps in place?
0
❑
❑
❑
Are pumps operational?
■
❑
❑
❑
Are there adequate spare parts and supplies on site?
0
❑
❑
❑
Comment:
Disinfection -Gas
Yes
No
NA
NE
Are cylinders secured adequately?
0
❑
❑
❑
Are cylinders protected from direct sunlight?
0
❑
❑
❑
Is there adequate reserve supply of disinfectant?
■
❑
❑
❑
Is the level of chlorine residual acceptable?
0
❑
❑
❑
Is the contact chamber free of growth, or sludge buildup?
0
❑
❑
❑
Is there chlorine residual prior to de -chlorination?
0
❑
❑
❑
Does the Stationary Source have more than 2500 Ibs of Chlorine (CAS No.
❑
❑
❑
7782-50-5)?
If yes, then is there a Risk Management Plan on site?
❑
❑
❑
If yes, then what is the EPA twelve digit ID Number? (1000-
If yes, then when was the RMP last updated?
Comment: Both chlorine contact chambers were in service.
De -Chlorination Yes No NA NE
Type of system ? Gas
Page# 7

Permit: NCO021156
Inspection Date: 02/15/2023
De -chlorination
Owner -Facility: Mount Holly WWTP
Inspection Type: Compliance Evaluation
Is the feed ratio proportional to chlorine amount (1 to 1)?
Is storage appropriate for cylinders?
# Is de -chlorination substance stored away from chlorine containers?
Are the tablets the proper size and type?
Comment: The chlorine and sulfur dioxide gas cylinders are stored outside under cover.
Are tablet de -chlorinators operational?
Number of tubes in use?
Comment:
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ ■ ❑
❑ ❑ ■ ❑
❑ ❑ ■ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Comment: The flow meter is calibrated twice per year and was last calibrated on 12/1/2022 b
Clearwater, Inc.
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?
M
❑
❑
❑
If effluent (diffuser pipes are required) are they operating properly?
❑
❑
0
❑
Comment: The effluent appeared clear with trace suspended solids and no foam. The receiving
stream did not appear to be negatively impacted.
Aerobic Digester
Yes
No
NA NE
Is the capacity adequate?
0
❑
❑
❑
Is the mixing adequate?
0
❑
❑
❑
Is the site free of excessive foaming in the tank?
M
❑
❑
❑
# Is the odor acceptable?
0
❑
❑
❑
# Is tankage available for properly waste sludge?
■
❑
❑
❑
Comment: The facility is equipped with two aerated sludge holding tanks. Bio-solids are either
land applied by Synagro under the authority
of Permit No. WQ0001863 or dewatered
and disposed at a permitted landfill (currently
being performed by Bio-nomics).
Page# 8

Permit: NC0021156
Inspection Date: 02/15/2023
Owner - Facility: Mount Holly 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
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Comment: The backup generator can power six of the eight platform aerators (3 per aeration
basin) and all remaining treatment processes. The generator is tested monthly and
placed under load semi-annually. The generator is also serviced bV a contracted
company (Power Generation) semi-annually.
Page# 9

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 2 u 3 I NC0021156 111 121 23/11/16 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 I r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
2.0 70Id I 71 I„ I 72 r., 71 I 74 79 I I I I I I I80
L—I ty 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)
09:10AM 23/11/16
19/12/01
Mount Holly WWTP
165 Broome St
Exit Time/Date
Permit Expiration Date
Mount Holly NC 28120
03:10PM 23/11/16
24/02/29
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Keith E Lynch///
Nadine J Blackwell///
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Danny Jackson,PO Box 406 Mt Holly NC 281200406/Interim City
Manager/704-827-3931/7048222933 No
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
Wes Bell DWR/MRO WQ/704-235-2192/
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
NCO021156 I11 12I 23/11/16 117 18 1,1
IUI
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
The City currently has 3 SIUs with 2 being CIUs. No SIUs were in SNC for the last 2 semi-annual
periods. All SIUs were inspected and sampled in 2022 and no IUPs have expired.
One SIU (A&E) is currently under a consent order which will include the construction of new
pretreatment facilities.
The City's records were organized and well maintained. The City's Industrial Pretreatment Program
was being properly implemented.
Page#

Permit: NC0021156
Inspection Date: 11/16/2023
Owner -Facility: Mount Holly WWTP
Inspection Type: Pretreatment Audit
Yes No NA NE
Page#

NH3/TRC WLA Calculations
Mt Holly WWTP
PermitNo. NC0021156
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 4
Enter s7Q10 (cfs): 95
Enter w7Q10 (cfs): 95
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS) 95
s7Q10 (CFS)
95
DESIGN FLOW (MGD) 4
DESIGN FLOW (MGD)
4
DESIGN FLOW (CFS) 6.2
DESIGN FLOW (CFS)
6.2
STREAM STD (UG/L) 17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1) 0
Upstream Bkgd (mg/1)
0.22
IWC (%) 6.13
IWC (%)
6.13
Allowable Conc. (ug/1) 277
Allowable Conc. (mg/1)
13.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
95
Monthly Average Limit: 200/100ml
DESIGN FLOW (MGD)
4
(If DF >331; Monitor)
DESIGN FLOW (CFS)
6.2
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF) 16.32
Upstream Bkgd (mg/1)
0.22
IWC (%)
6.13
Allowable Conc. (mg/1)
26.0
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/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/l
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis);
capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY CHECK WQS
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfal I
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Mt Holly WWTP
Grade IV
NCO021156
001
4.000
Catawba River
03050101
WS-IV; CA
❑✓ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
95.00
95.00
716.00
3016.00
77.57
Effluent Hardness
- - - - - - - - - - - -
Upstream Hardness
-----------------------
Combined Hardness Chronic
Combined Hardness Acute
38.77 mg/L (Avg)
- - - - - - - - - - - - - - - - -
I 21.05 mg/L (Avg)
9 -----
I 25 /L
25 m /L
I Perm ittee-subm itted DMRS and PPAs.
Data Sources)
❑ CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
Par01
Par02
Par03
Par04
Par05
Par06M
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
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
0.5899
FW
3.2396
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
117.7325
FW
905.0818
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
7.8806
FW
10.4720
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
2.9416
FW
75.4871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Water Supply
NC
160
WS
ug/L
Nickel
Aquatic Life
NC
37.2313
FW
335.2087
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.2964
ug/L
Zinc
Aquatic Life
NC
126.7335
FW
125.7052
ug/L
Antimony
Human Health
NC
640
HH
pg/L
Dichlorobromomethane
Water supply
C
0.55
WS
pg/L
MBAS
Water Supply
NC
500
WS
pg/L
Chloroform
Water supply
NC
60
WS
pg/L
21156 RPA 2024, input
4/9/2024

H1
1
2
3
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
REASONABLE POTENTIAL ANALYSIS
H2
Use "PASTE SPECIAL Use "PASTE SPECIAL
Effluent Hardness Values" then "COPY• Upstream Hardness Values" then "COPY"
. Maximum data . Maximum data
points = 58 points = 58
Date Data
BDL=1/2DL
5/1/2019
42
42
5/15/2019
56
56
6/13/2019
38
38
7/16/2019
32
32
12/4/2019
32
32
2/11/2020
40
40
5/7/2020
50
50
8/6/2020
40
40
11 /5/2020
16
16
11/10/2020
36
36
2/4/2021
16
16
3/19/2021
42
42
5/6/2021
46
46
8/5/2021
38
38
11/4/2021
36
36
2/10/2022
37
37
5/5/2022
39
39
8/4/2022
38
38
11/10/2022
50
50
2/16/2023
48
48
5/16/2023
40
40
8/17/2023
41
41
Results
Std Dev.
9.4261
Mean
38.7727
C.V.
0.2431
n
22
10th Per value
32.00 mg/L
Average Value
38.77 mg/L
Max. Value
56.00 mg/L
Date Data
BDL=1/2DL
Results
1 5/1/2019
28
28
Std Dev.
10.5854
2 5/13/2019
10
10
Mean
21.0500
3 6/13/2019
10
10
C.V.
0.5029
4 7/16/2019
14
14
n
20
5 12/4/2019
12
12
10th Per value
10.00 mg/L
6 2/11/2020
40
40
Average Value
21.05 mg/L
7 5/7/2020
14
14
Max. Value
49.00 mg/L
8 8/6/2020
16
16
9 11 /5/2020
16
16
10 2/4/2021
36
36
11 5/6/2021
24
24
12 8/5/2021
16
16
13 11 /4/2021
16
16
14 2/10/2022
9
9
15 5/2/2022
24
24
16 8/4/2022
18
18
17 11/10/2022
21
21
18 2/16/2023
24
24
19 5/16/2023
24
24
20 8/17/2023
49
49
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
21156 RPA 2024, data
-2- 4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Date Data
1 5/9/2019 <
2 8/8/2019 <
3 11 /7/2019 <
4 2/6/2020 <
5 5/7/2020 <
6 8/6/2020 <
7 11 /5/2020 <
8 11/10/2020 <
9 2/4/2021 <
10 3/19/2021
11 5/6/2021 <
12 8/5/2021 <
13 11 /4/2021 <
14 2/10/2022
15 5/5/2022 <
16 8/4/2022 <
17 11/10/2022 <
18 2/16/2023 <
19 5/16/2023 <
20 8/17/2023 <
21
22
23
24
25
26
27
28
29
3
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
Results
2
1
Std Dev.
2
1
Mean
2
1
C.V.
2
1
n
2
1
2
1
Mult Factor =
2
1
Max. Value
2
1
Max. Fred Cw
2
1
2
2
2
1
2
1
2
1
2
2
10
5
2.2
1.1
2
1
2
1
2
1
2
1
Use "PASTE SPECIAL Par03
Values" then "COPY"
. Maximum data
points = 58
1.3050
0.7065
20
1.43
5.0 ug/L
7.2 ug/L
Date Data
1 3/19/2021 <
2 5/5/2022 <
3
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
Use "PASTE SPECIAL
Beryllium
Values" then "COPY"
. Maximum data
points = 58
BDL=1/2DL
Results
1 0.5
Std Dev.
0.0000
1 0.5
Mean
0.5000
C.V. (default)
0.6000
n
2
Mult Factor =
3.79
Max. Value
0.50 ug/L
Max. Fred Cw
1.90 ug/L
-3-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par04
Cadmium
Date
Data
BDL=1/2DL
Results
1
5/9/2019
<
0.5
0.25
Std Dev.
2
8/8/2019
<
0.5
0.25
Mean
3
11/7/2019
<
0.5
0.25
C.V.
4
12/4/2019
<
0.5
0.25
n
5
2/6/2020
<
0.5
0.25
6
5/7/2020
<
0.5
0.25
Mult Factor =
7
8/6/2020
<
0.5
0.25
Max. Value
8
11/5/2020
<
5
2.5
Max. Fred Cw
9
11/10/2020
<
5
2.5
10
2/4/2021
<
0.5
0.25
11
3/19/2021
0.5
0.5
12
5/6/2021
<
0.5
0.25
13
8/5/2021
<
0.5
0.25
14
11/4/2021
<
0.5
0.25
15
2/10/2022
0.5
0.5
16
5/5/2022
<
0.5
0.25
17
8/4/2022
<
0.5
0.25
18
11/10/2022
<
0.5
0.25
19
2/16/2023
<
0.5
0.25
20
5/16/2023
<
0.5
0.25
21
8/17/2023
<
0.5
0.25
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Pdr05
Values" then "COPY"
. Maximum data
points = 58
0.4881
1.3789
21
1.73
2.500 ug/L
4.325 ug/L
1
2
3
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
Chlorides
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Fred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
NO DATA
NO DATA
0
N/A
N/A mg/L
N/A mg/L
-4-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par06
Date
1
2
3
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
Pdr07
Use "PASTE SPECIAL
Chlorinated Phenolic Compounds
values" "'" "COPY'.
Total
Phenolic Compounds
. Maximum data
points = 58
Data BDL=1/2DL Results
Date
Data
BDL=1/2DL
Results
Std Dev.
NO DATA
1
5/9/2019
<
5
2.5
Std Dev.
Mean
NO DATA
2
8/8/2019
5.1
5.1
Mean
C.V.
NO DATA
3
11/7/2019
7.6
7.6
C.V.
n
0
4
2/6/2020
<
5
2.5
n
5
5/7/2020
<
5
2.5
Mult Factor =
N/A
6
8/6/2020
<
5
2.5
Mult Factor =
Max. Value
N/A ug/L
7
11/5/2020
<
5
2.5
Max. Value
Max. Fred Cw
N/A ug/L
8
2/4/2021
<
5
2.5
Max. Fred Cw
9
3/19/2021
16
16
10
5/6/2021
13
13
11
8/5/2021
< 5
2.5
12
11 /4/2021
< 5
2.5
13
2/10/2022
< 5
2.5
14
5/5/2022
< 5
2.5
15
8/4/2022
< 5
2.5
16
11/10/2022
< 5
2.5
17
2/16/2023
< 5
2.5
18
5/17/2023
< 5
2.5
19
8/17/2023
< 5
2.5
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY''
. Maximum data
points = 58
4.1684
0.9332
19
1.60
16.0 ug/L
25.6 ug/L
-5-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par08
Chromium III
Date
Data BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Fred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Par09
Use "PASTE SPECIAL
Use "PASTE SPECIAL
Values" then "COPY"
Chromium VI
Values" then "COPY"
. Maximum data
. Maximum data
points = 58
points = 58
Date
1
Data BDL=1/2DL Results
Std Dev.
NO DATA
NO DATA
NO DATA
2
Mean
NO DATA
NO DATA
3
C.V.
NO DATA
0
4
n
0
5
N/A
6
Mult Factor =
N/A
N/A Ng/L
7
Max. Value
N/A Ng/L
N/A Ng/L
8
Max. Fred Cw
N/A Ng/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
21156 RPA 2024, data
-6- 4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par10
Chromium, Total
Date
Data
BDL=1/2DL
Results
1
5/9/2019
<
5
2.5
Std Dev.
2
8/8/2019
6.6
6.6
Mean
3
11/7/2019
17
17
C.V.
4
12/4/2019
9.1
9.1
n
5
2/6/2020
15
15
6
5/7/2020
9.7
9.7
Mult Factor =
7
8/6/2020
8.2
8.2
Max. Value
8
11/5/2020
7.7
7.7
Max. Fred Cw
9
11/10/2020
8
8
10
2/4/2021
<
5
2.5
11
3/19/2021
7.8
7.8
12
5/6/2021
21
21
13
8/5/2021
14
14
14
11/4/2021
8
8
15
2/10/2022
7.9
7.9
16
5/5/2022
30
30
17
8/4/2022
6.6
6.6
18
11/10/2022
6.1
6.1
19
2/16/2023
5.1
5.1
20
5/16/2023
<
5
2.5
21
8/17/2023
<
5
2.5
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Pall
Values" then "COPY" Copper. Maximum data
points = 58
9.4190
0.7193
21
1.41
30.0 Ng/L
42.3 Ng/L
Date
Data
BDL=1/2DL
Results
1
5/9/2019
14
14
Std Dev.
2
8/8/2019
14
14
Mean
3
11/7/2019
17
17
C.V.
4
12/4/2019
130
130
n
5
8/6/2020
11
11
6
11/5/2020
11
11
Mult Factor =
7
11/10/2020
11
11
Max. Value
8
2/4/2021
< 2
1
Max. Fred Cw
9
3/19/2021
11
11
10
5/6/2021
37
37
11
8/5/2021
7.8
7.8
12
11 /4/2021
8.8
8.8
13
2/10/2022
12
12
14
5/5/2022
24
24
15
8/4/2022
9.8
9.8
16
11 /10/2022
12
12
17
2/16/2023
8.7
8.7
18
5/16/2023
13
13
19
8/17/2023
12
12
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
19.2158
1.4465
19
1.87
130.00 ug/L
243.10 ug/L
-7-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par12
Cyanide
Date
Data
BDL=1/2DL
Results
1
5/9/2019
<
10
5
Std Dev.
2
8/8/2019
<
10
5
Mean
3
11/7/2019
<
10
5
C.V.
4
2/6/2020
<
10
5
n
5
5/7/2020
<
10
5
6
8/6/2020
<
10
5
Mult Factor =
7
11/5/2020
28
28
Max. Value
8
2/4/2021
<
10
5
Max. Fred Cw
9
3/19/2021
10
10
10
5/6/2021
<
10
5
11
8/5/2021
<
10
5
12
11/4/2021
<
30
15
13
2/10/2022
<
10
5
14
5/19/2022
<
10
5
15
8/25/2022
<
4
5
16
11/10/2022
7
5
17
2/16/2023
<
10
5
18
5/16/2023
<
10
5
19
8/17/2023
<
10
5
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Pdr13
Values" then "COPY"
. Maximum data
points = 58
7.00
0.8095
19
1.52
28.0 ug/L
42.6 ug/L
1
2
3
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
Fluoride
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Fred Cw
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
-8-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par14
Lead
Date
BDL=1/2DL
Results
1
5/9/2019
< 2
1
Std Dev.
2
8/8/2019
< 2
1
Mean
3
11/7/2019
< 2
1
C.V.
4
12/4/2019
< 2
1
n
5
2/6/2020
< 2
1
6
5/7/2020
< 2
1
Mult Factor =
7
8/6/2020
< 2
1
Max. Value
8
11/5/2020
< 2
1
Max. Fred Cw
9
11/10/2020
< 2
1
10
2/4/2021
< 2
1
11
3/19/2021
2
2
12
5/6/2021
< 2
1
13
8/5/2021
< 2
1
14
11 /4/2021
< 2.2
1.1
15
2/10/2022
< 2
1
16
5/5/2022
< 2
1
17
8/4/2022
< 10
5
18
11/10/2022
< 2
1
19
2/16/2023
< 2
1
20
5/16/2023
< 2
1
21
8/17/2023
< 2
1
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par15
Values" then "COPY"
. Maximum data
points = 58
1.2429
0.7145
21
1.41
5.000 ug/L
7.050 ug/L
1
2
3
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
Mercury
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Fred Cw
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
NO DATA
NO DATA
0
N/A
N/A ng/L
N/A ng/L
-9-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par16
Date Data
1 5/9/2019 <
2 8/8/2019 <
3 11 /7/2019 <
4 2/6/2020 <
5 5/7/2020 <
6 8/6/2020 <
7 11 /5/2020 <
8 2/4/2021 <
9 5/6/2021 <
10 8/5/2021 <
11 11/4/2021 <
12 2/10/2022
13 5/5/2022 <
14 8/4/2022 <
15 11/10/2022 <
16 2/16/2023 <
17 5/16/2023 <
18 8/17/2023 <
19
20
21
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Molybdenum
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
1 0.5
Max. Fred Cw
10 5
10 5
10 5
10 10
10 5
10 5
10 5
10 5
10 5
10 5
Use "PASTE SPECIAL Par17 & Pdr18
Values" then "COPY"
. Maximum data
points = 58
5.0278
0.3244
18
1.22
10.0 ug/L
12.2 ug/L
Date Data
1 5/9/2019 <
2 8/8/2019
3 11 /7/2019 <
4 12/4/2019 <
5 2/6/2020
6 5/7/2020
7 8/6/2020 <
8 11/5/2020 <
9 11/10/2020 <
10 2/4/2021 <
11 3/19/2021
12 5/6/2021
13 8/5/2021 <
14 11/4/2021 <
15 2/10/2022 <
16 5/5/2022 <
17 8/4/2022 <
18 11/10/2022 <
19 2/16/2023 <
20 5/16/2023 <
21 8/17/2023 <
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
Nickel
BDL=1/2DL
Results
2
1
Std Dev.
2.1
2.1
Mean
2
1
C.V.
2
1
n
2.2
2.2
2.8
2.8
Mult Factor =
2
1
Max. Value
2
1
Max. Fred Cw
2
1
2
1
2
2
2.2
2.2
2
1
2.2
1.1
2
1
10
5
2
1
2
1
2
1
2
1
2
1
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
1.4952
0.6551
21
1.37
5.0 Ng/L
6.9 Ng/L
21156 RPA 2024, data
-10- 4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par19
Date Data
1 5/9/2019 <
2 8/8/2019 <
3 11 /7/2019 <
4 2/6/2020 <
5 5/7/2020 <
6 8/6/2020 <
7 11 /5/2020 <
8 11/10/2020 <
9 2/4/2021 <
10 3/19/2021
11 5/6/2021 <
12 8/5/2021 <
13 11 /4/2021
14 2/10/2022 <
15 5/5/2022 <
16 8/4/2022 <
17 11/10/2022 <
18 2/16/2023 <
19 5/16/2023 <
20 8/17/2023 <
21
22
23
24
25
26
27
28
29
3
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
Selenium
BDL=1/2DL
Results
5 2.5
Std Dev.
5 2.5
Mean
5 2.5
C.V.
5 2.5
n
5 2.5
5 2.5
Mult Factor =
1 0.5
Max. Value
1 0.5
Max. Fred Cw
5 2.5
5 5
5 2.5
5 2.5
5 5
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
Use "PASTE SPECIAL Par20
Values" then "COPY"
. Maximum data
points = 58
2.5500
0.4068
20
1.25
5.0 ug/L
6.3 ug/L
Date Data
1 5/9/2019 <
2 8/8/2019 <
3 11 /7/2019 <
4 12/4/2019 <
5 8/6/2020 <
6 11/5/2020 <
7 11/10/2020 <
8 2/4/2021 <
9 3/19/2021
10 5/6/2021 <
11 8/5/2021 <
12 11/4/2021
13 2/10/2022 <
14 5/5/2022 <
15 8/4/2022 <
16 11/10/2022 <
17 2/16/2023 <
18 5/16/2023 <
19 8/17/2023 <
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
Silver
BDL=1/2DL
Results
0.5
Std Dev.
0.5
Mean
0.5
C.V.
0.5
n
0.5
0.5
Mult Factor =
0.5
Max. Value
0.5
Max. Fred Cw
1
0.5
0.5
1
i 2.5
0.5
0.5
0.5
0.5
0.5
0.5
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
0.6579
0.7189
19
1.46
2.500 ug/L
3.650 ug/L
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date
Data
BDL=1/2DL
Results
1
5/9/2019
42
42
Std Dev.
2
8/8/2019
56
56
Mean
3
11/7/2019
56
56
C.V.
4
12/4/2019
62
62
n
5
2/6/2020
25
25
6
5/7/2020
95
95
Mult Factor =
7
8/6/2020
73
73
Max. Value
8
11/5/2020
41
41
Max. Fred Cw
9
11/10/2020
34
34
10
2/4/2021
< 10
5
11
3/19/2021
20
20
12
5/6/2021
60
60
13
8/5/2021
62
62
14
11/4/2021
57
57
15
2/10/2022
58
58
16
5/5/2022
280
280
17
8/4/2022
46
46
18
11/10/2022
370
370
19
2/16/2023
33
33
20
5/16/2023
48
48
21
8/17/2023
28
28
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par22
Values" then "COPY"
. Maximum data
points = 58
73.8571
1.1773
21
1.64
370.0 ug/L
606.8 ug/L
Date Data
1 5/9/2019
2 8/8/2019
3 11/7/2019
4 8/6/2020
5 11 /5/2020
6 11/10/2020
7 2/4/2021 <
8 3/19/2021
9 5/6/2021
10 8/5/2021
11 11/4/2021
12 2/10/2022
13 5/5/2022
14 8/4/2022 <
15 11/10/2022
16 2/16/2023
17 5/16/2023
18 8/17/2023
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
Use "PASTE SPECIAL
Antimony
Values" then "COPY"
. Maximum data
points = 58
BDL=1/2DL
Results
28
28
Std Dev.
16.5049
26
26
Mean
21.5000
11
11
C.V.
0.7677
19
19
n
18
28
28
21
21
Mult Factor =
1.53
5
2.5
Max. Value
77.000000 Ng/L
7.5
7.5
Max. Fred Cw
117.810000 Ng/L
16
16
5
5
35
35
26
26
77
77
22
11
16
16
28
28
15
15
15
15
-12-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par23
Date Data
1 5/9/2019
2 8/8/2019
3 11 /7/2019 <
4 8/17/2023
5 3/19/2021 <
6 5/5/2022
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Dichlorobromomethane Values" then "COPY"
. Maximum data
points = 58
BDL=1/2DL
Results
6.6 6.6
Std Dev.
6.3488
10 10
Mean
7.4333
1 0.5
C.V. (default)
0.6000
17 17
In
6
1 0.5
10 10
Mult Factor =
2.14
Max. Value 17.000000 Ng/L
Max. Pred Cw 36.380000 Ng/L
Date Data
1 5/9/2019
2 8/8/2019
3 11/7/2019
4 2/6/2020
5 5/7/2020
6 8/6/2020
7 11 /5/2020
8 2/4/2021
9 5/6/2021
10 8/5/2021
11 11/17/2022 <
12 8/22/2023
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
MBAS Values" then "COPY"
. Maximum data
points = 58
BDL=1/2DL
Results
340
340
Std Dev.
205.2977
260
260
Mean
282.6667
410
410
C.V.
0.7263
330
330
In
12
230
230
170
170
Mult Factor =
1.77
420
420
Max. Value
800.000000 Ng/L
220
220
Max. Pred Cw
pg/L
800
800
82
82
100
50
80
80
-13-
21156 RPA 2024, data
4/9/2024

REASONABLE POTENTIAL ANALYSIS
Par25
Use "PASTE SPECIAL
Chloroform
Values" then "COPY"
. Maximum data
points = 58
Date Data
BDL=1/2DL
Results
1
3/19/2021
1.1 1.1
Std Dev.
3.2036
2
5/5/2022
5.6 5.6
Mean
4.6667
3
8/17/2023
7.3 7.3
C.V. (default)
0.6000
4
n
3
5
6
Mult Factor =
3.00
7
Max. Value
7.300000 Ng/L
8
Max. Fred Cw
21.900000 Ng/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
21156 RPA 2024, data
- 14 - 4/9/2024

Mt Holly WWTP
NCO021156
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD)
= 4.0000 WWTP/WTP Class: Grade IV
1Q10S (cfs)
= 77.57 IWC% @ 1Q10S = 7.40121762
7Q10S (cfs)
= 95.00 IWC% @ 7Q10S = 6.126482213
7Q10W (cfs)
= 95.00 IWC% @ 7Q10W = 6.126482213
30Q2 (cfs)
= 716.00 IWC% @ 30Q2 = 0.858487953
Avg. Stream Flow, QA (cfs)
= 3016.00 IW°/uC @ QA = 0.205148567
Receiving Stream:
Catawba River HUC 03050101 Stream Class: WS-IV; CA
Outfall 001
Qw=4MGD
COMBINED HARDNESS (mg/L)
Acute = 25 mg/L
Chronic = 25 mg/L
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS WATER SUPPLY
Effluent Hard: 0 value > 100 mg/L
Effluent Hard Avg = 38.77 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
J
F
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
a
Applied
Chronic Acute
D # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 4,593.8
Arsenic
C
150 FW(7Q10s) 340
ug/L
20 2
7.2
_
Chronic (FW) 2,448.4
No RP, Predicted Max < 50% of Allowable Cw - No
No value >_ Allowable
Monitoring required
Arsenic
C
10 HH/WS(Qavg)
ug/L
_Cw
Chronic (HI -I): 4,874.5
No value > Allowable Cw
Acute: 878.23
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
2 0
1.90
_
Note: n < 9
C.V. (default)
Chronic: 106 10
No detects - No Monitoring required
Limited data set
NO DETECTS
Max MDL = 1
Acute: 43.771
Cadmium
NC
0.5899 FW(7Q10s) 3.2396
ug/L
21 2
4.325
_ _ _ _ _
Chronic: 9.628
No RP, Predicted Max < 50% of Allowable Cw -No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
0 0
N/A
_ _ _ _
— Chronic: - — - —3, 754.2 —
— — — — — — — — — — — — —
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
_ _ _ _
— Chronic: _- - -- .5 ------------------------------
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
19 4
25.6
Chronic: 34,945.2
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 12,228.8
Chromium III
NC
117.7325 FW(7Q10s) 905.0818
µg/L
0 0
N/A
_ _
--Chronic: --1,921.7--------------
Acute: 216.2
RP for Limited Dataset (n<8) but 2 values > Allowable
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
Cw- apply Monthly Monitoring with Limit
-- ---- -- --
Chronic:
-------------------------
Tot Cr value(s) > 5 but < Cr VI Allowable Cw
Chromium, Total
NC
µg/L
21 17 42.3 Max reported value = 30
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
allowable Cw for Cr VI.
21156 RPA 2024, rpa
Page 15 of 16 4/9/2024

Mt Holly WWTP - Outfall 001
NCO021156 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 4 MGD
Acute: 141.49
Copper
NC
7.8806 FW(7Q10s) 10.4720
ug/L
19 18
243.10
--C_ _ ----128.6__3 --
--------------------------
hronic:
RP shown -apply Monthly Monitoring with Limit
1 values > Allowable Cw
Acute: 297.2
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
19 3
42.6
_ _ _
Chronic: 81.6
No RP, Predicted Max a 50% of Allowable Cw -
No value > Allowable Cw
apply Quarterly Monitoring
Acute: NO WQS
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
- -C_ hroni_ _
c: - 29,380.6--------------
Acute: 1,019.928
Lead
NC
2.9416 FW(7Q10s) 75.4871
ug/L
21 1
7.050
_ _ _ _ _ _ _
Chronic: 48.015
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
--C_ _
hronic: _____19
- - - - - - - - - -
Acute: NO WQS
Molybdenum
NC
160 WS(7Q10s)
ug/L
18 1
12.2
_ _ _
Chronic: 2,611.E
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute (FW): 4,529.1
Nickel
NC
37.2313 FW(7Q10s) 335.2087
µg/L
-
___ _ ___
_ ___ _ _ _ _ _ _ _ _
No value >_ Allowable
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
-No _Cw
Chronic (WS) 408.1
No value > Allowable Cw
Acute: 756.6
Selenium
NC
5 FW(7Q10s) 56
ug/L
20 2
6.3
_ _ _
Chronic: 81.E
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 4.005
Silver
NC
0.06 FW(7Q10s) 0.2964
ug/L
19 2
3.650
--C_ _ hronic: - - - - 0_.979_ --
--------------------------
RP shown -apply Monthly Monitoring with Limit
3 values > Allowable Cw
Acute: 1,698.4
Zinc
NC
126.7335 FW(7Q10s) 125.7052
ug/L
21 20
606.8
_ _ _ _ _
Chronic: 2,068.E
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Antimony
NC
640 HH(7Q10s)
µg/L
18 16
117.81000
Chronic: 10446.45161
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Dichlorobromomethane
C
0.55 WS(Qavg)
µg/L
6 4
36.38000
Note: n < 9
C.V. (default)
Chronic: 268.09839
No RP, Predicted Max < 50% of Allowable Cw -No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
MBAS
NC
500 WS(7Q10s)
µg/L
12 11
1,416.00000
_
Chronic: 8161.29032
No RP, Predicted Max < 50% of Allowable Cw -No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Chloroform
NC
60 WS(7Q10s)
µg/L
3 3
21.90000
Note: n < 9
C.V. (default)
_ __________________
Chronic: 979.35484
No RP for limited dataset (n < S samples) - No
Limited data set
No value > Allowable Cw
Monitoring required
21156 RPA 2024, rpa
Page 16 of 16 4/9/2024

FACILITY: Mt Holly WWTP Outfall 001
NPDES PERMIT: NCO021156
Dissolved to Total Metal Calculator
In accordance with Federal Regulations, permit limitations must be written as Total Metals per 40 CFR 122.45(c)
PARAMETER
Cadmium (d)
Cd -Trout stre,
Chromium III (d)(
Chromium VI (d)
Chromium. Total
Nickel(d)(h)
Ni - WS streams
Silver (d)(h,acut
Zinc (d)(h)
Receiving
Receiving
Rec. Stream
NPDES
Total Suspended
Combined
Combined
Instream Instream
Effluent
Stream
Stream
Solids
Hardness
Hardness
Wastewater Wastewater
Upstream
Hardness
1Q10
Flow Limit
Hardness
summer
summer 7Q10
-Fixed Value-
chronic
Acute
Concentration Concentration
Average (mg L)
Average
7Q10 (CFS)
(MGD)
[MGD]
[MGD]
mg/L)
(mg/L)
(mg/L)
(Chronic) (Acute)
(mg/L)
95.0000
61.2903
50.0452
4.0000
10
25.000
25.000
6.1265 7.4012
21.05
38.7727
Upstream Hard Avg (mg/L) = 21.05
EFF Hard Avg (mg/L) = 38.7727
Dissolved Metals Criteria
US EPA
Total Metal Criteria
Total Metal =
COMMENTS (identify parameters to PERCS Branch to maintain in facility's LTMP/STMP):
after applying hardness
Translators -using
Dissolved Metal
+Translator
equation
Default Partition
Chronic
Acute
Coefficients
Chronic
Acute
u /I
u /I
streams
u /I
u /I
0.151
0.82
0.252
0.591
3.24
24
1831
0.202
117.73
905.08
11
16
1.000
11.00
16.00
N/A
N/A
2.7
3.6
0.348
7.88
10.47
0.54
14
0.184
2.94
75.49
16
145
0.432
37.23
335.21
25 N/A
0.06
0.301
1.0001
0.061 0.30
36
361
0.2881
126.73 125.71
IBeryllium 1.0001 JW6.51 -
Arsenic (d) 1.0001 Vr 150
(d) = dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(h) = hardness -dependent dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(t) = based upon measurement of total recoveable metal. See 15A NCAC 02B .0211 for more information.
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard.
The Human Health standard for Arsenic is 10 µg/L which is Total Recoverable metal standard.

Permit No. NC0021156
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/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
213.0200 (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-[1n hardness] (0. 04183 8)) • e^{0.9151 [In hardness]-3.1485)
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151[ln hardness] -3.623 6)
Cadmium, Chronic
WER*{1.101672-[ln hardness](0.041838)} • e^{0.7998[ln hardness]-4A45l)
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. NCO021156
Silver, Acute
WER*0.85 • eA0.72[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. NCO021156
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avfz. 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 1 Q 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 1 + { [Kpo] [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)(s7Q 10) (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:
1 Q 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0021156
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
38.77
Permittee submitted DMRs
(Total as CaCO3)
Average Upstream Hardness, mg/L
21.05
Permittee submitted DMRs
(Total as CaCO3)
7Q10 summer (cfs)
95
Reported in previous permit Fact
Sheet
1 Q 10 (cfs)
77.57
Calculated in RPA spreadsheet
Permitted Flow (MGD)
4.0
Design flow
Date: January 17, 2024
Permit Writer: Gary Perlmutter
Page 4 of 4

2018 Generic RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfal I
Flow, Qw (MGD)
Receiving Stream
Stream Class
HUC Number
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1 Q10s (cfs)
Data Source(s)
❑ CHECK IF HQW OR ORW
Mt Holly WWTP
Class IV
NCO021156
001
4.000
Catawba River
WS-IV; CA
03050101
95.00
95.00
716.00
3016.00
77.57
Data from submitted Effluent Pollutant Scans
❑ CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Table 2. Parameters of Concern
Name Type Chronic Modifier Acute PQL Units
1,4-dioxane
C
0.35
HH
pg/L
Bromoform
C
7
WS
Ng/L
Dibromochloromethane
C
21
HH
pg/L
21156 suppl RPA, input
4/9/2024

REASONABLE POTENTIAL ANALYSIS
1
2
3
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
1,4-dioxane
Values" then "COPv"
Bromoform
Values" then "COPY"
. Maximum data points
. Maximum data points
= 58
= 58
Date Data BDL=1/2DL Results
Date Data
BDL=1/2DL
Results
Std Dev.
NO DATA
1
3/19/2021 <
1 0.5
Std Dev.
4.1765
Mean
NO DATA
2
5/5/2022
2.1 2.1
Mean
3.6667
C.V.
NO DATA
3
8/17/2023
8.4 8.4
C.V. (default)
0.6000
n
0
4
n
3
5
Mult Factor =
N/A
6
Mult Factor =
3.0000
Max. Value
N/A lag/L
7
Max. Value
8.4 lag/L
Max. Pred Cw
N/A pg/L
8
Max. Pred Cw
25.2 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
21156 suppl RPA, data
-2- 4/9/2024

REASONABLE POTENTIAL ANALYSIS
Dibromochloromethane
,Values" then "COPY"
. Maximum data points
= 58
Date
Data BDL=1/2DL
Results
1 3/19/2021
< 1 0.5
Std Dev.
12.5048
1
2 5/5/2022
8.4 8.4
Mean
11.3000
2
3 8/17/2023
25 25
C.V. (default)
0.6000
3
4
n
3
4
5
5
6
Mult Factor =
3.0000
6
7
Max. Value
25.0 lag/L
7
8
Max. Pred Cw
75.0 pg/L
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
NO PARAMETER DEFINED
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Values" then "COPY"
Maximum data points
= 58
NO DATA
NO DATA
0
N/A
N/A
N/A
21156 suppl RPA, data
-3- 4/9/2024

Mt Holly WWTP REASONABLE POTENTIAL ANALYSIS
NCO021156 2018 Generic RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
Qw (MGD) = 4.0000
WWTP/WTP Class: Class IV
1Q10S (cfs) = 77.57
IWC% @ 1Q10S = 7.40121762
7Q10S (cfs) = 95.00
IWC% @ 7Q10S = 6.12648221
7Q10W (cfs) = 95.00
IW%C @ 7Q10W = 6.12648221
30Q2 (cfs) = 716.00
1WC% @ 30Q2 = 0.85848795
Avg. Stream Flow, QA (cfs) = 3016.00
1WC% @ QA = 0.20514857
Receiving Stream: Catawba River HUC 03050101
Stream Class: WS-IV; CA
Outfall 001
Qw=4MGD
PARAMETER
NC STANDARDS OR EPA CRITERIA
J
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
F
D
Chronic Acute Aplieda
n # Det. Max Pred Cw Allowable Cw
Stand d
Acute: NO WQS
1,4-dioxane
C
0.35 HH(Qavg)
µg/L
0 0
N/A
_ _ _ _
--------
----------------------------
Chronic
Acute: NO WQS
Bromoform
C
7 WS(Qavg)
µg/L
3 2
25.2
Note: n < 9
Default C.V.
_ _ _ _ _ _ _
Chronic 3,412.16
_ _ _ _ _ _ _ _ _ _ _ _ _
No RP for limited dataset (n < 8 samples) - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Dibromochloromethane
C
21 HH(Qavg)
µg/L
3 2
75.0
Note: n < 9
Default C.V.
_ _ _ _ _ _ _
Chronic 10,236.48
_ _ _ _ _ _ _ _ _ _ _ _ _
No RP for limited dataset (n < 8 samples) - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute:
0 0
N/A
----------------------------
Chronic:
Acute:
0 0
N/A
_ _ ---------
----------------------------
Chronic
Acute:
0 0
N/A
----------------------------
Chronic:
Acute:
0 0
N/A
_ _ ---------
----------------------------
Chronic
Acute:
0 0
N/A
— — — —
— — — — — — — — — — — —
Chronic
Acute:
0 0
N/A
--------
------------------------
Chronic
Acute:
0 0
N/A
----------------------------
Chronic:
21156 suppl RPA, rpa
Page 4 of 4 4/9/2024

4/9/24 WQS = 12 ng/L
Facility Name
Mount Holly WWTP / NC0021156
/Permit No.
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-6
No Limit Required
MMP Required
7Q10s = 94.000 cfs WQBEL = 193.94 ng/L
Permitted Flow = 4.000 47 ng/L
5/9/19
0.678
0.678
8/6/19
1.58
1.58
11/7/19
3.89
3.89
2.0 ng/L
- Annual Average for 2019
2/7/20
11
11
5/7/20
43.9
43.9
8/6/20
1.15
1.15
18.7 ng/L
- Annual Average for 2020
2/4/21
2.17
2.17
5/6/21
18.9
18.9
8/5/21
1.05
1.05
11/4/21
1.6
1.6
5.9 ng/L
- Annual Average for 2021
5/5/22 <
0.5
0.5
11/10/22
1.55
1.55
1.0 ng/L
- Annual Average for 2022
2/14/23
3.45
3.45
5/16/23
0.975
0.975
8/15/23
2.1
2.1
2.2 ng/L
- Annual Average for 2023