NC0021156_Fact Sheet_20191112

Fact Sheet
NPDES Permit No. NCOO21156
Permit Writer/Email Contact Gary Perlmutter, [e-mail]
Date: September 26, 2019
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
® Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 21 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; 52% domestic, 48% 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 actual flows provided by PERCS for the calendar year 2017; permitted industrial flow is 1.6
MGD or 40% of total permitted flow.
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
August 1, 2014. This facility serves a population of 13,676 residents and operates a pretreatment program
with four Significant Industrial Users (SIUs), all of which are categorical. The SIUs include: 1) American
Page 1 of 13

& Efird, Inc. (CIU: 40 CFR 410 - textile), 2) Buckeye Mt. Holly, LLC (CIU 410 - textile), 3) Clariant
Corporation (CIU: 40 CFR 414 - organic chemicals, and 40 CFR 455 - pesticides), and 4) 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 modified NPDES permit was issued effective February 1, 2015 with the following changes:
• Mercury limits and monitoring requirements were removed,
• A Mercury Minimization Plan special condition was added in accordance with the statewide
Mercury TMDL
• Extension of the Total Phosphorus (TP) annual limit effective date by one year, to 2015.
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) 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. See Section 6: Other
TMDL/Nutrient Management Strategy Considerations for more details.
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).
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 -Catawba River
Stream Segment:
l l-(117)
Stream Classification:
WS-IV; CA
Drainage Area (mil):
2015
Summer 7Q 10 (cfs)
95 (control release)
Winter 7Q10 (cfs):
-
30Q2 (cfs):
716
Average Flow (cfs):
3016
IWC (% effluent):
6%
303(d) listed/parameter:
This segment is listed as impaired for PCB Fish Tissue
Advisory on the NC 2018 Final 303(d) list.
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.
Subbasin/HUC:
03-08-33 / 03050101
USGS Topo Quad:
F14SE, Mt. Holly, NC
Page 2 of 13

The receiving water 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 nutrient
limits related to the TMDL.
3. Effluent Data Summary
Effluent data is summarized in Table 1 below for the period February 2015 through January 2019.
Table 1. Effluent Data Summary
Parameter
Units
Average
Max
Min
Permit
Limit
Flow
MGD
2.143
7.662
0.718
MA 4.0
Total Monthly Flow
MG/mo
64.366
99.956
51.493
BOD5
mg/L
5.3
52.0
< 2.0
WA 30.0
MA 30.0
BOD removal
%
96.8
98.8
93.2
85
TSS
mg/L
13.8
96.0
2.0
WA 45.0
MA 30.0
TSS removal
%
9" -
97.8
85.4
85
NH3-N
mg/L
17.0
< 0.1
Fecal Coliform
(geometric mean)
#/100 mL
8
6,488
< 1
WA 400
MA 200
Total Residual Chlorine
µg/L
29
50
10
DM 28
Dissolved Oxygen
mg/L
5.9
8.2
3.7
DA > 5.0
Temperature
°C
19.2
29.0
6.0
pH
SU
6.9
7.6
5.7
6.0 - 9.0
TKN
mg/L
2.6
30.0
< 0.1
(NO2-N + NO3-N)
mg/L
14.8
36.0
0.04
TN
mg/L
17.2
46.0
TN Load
lb/mo
9,336
19,187
1,473
TN Load summer
(April 1 - October 31)
lb/summer
2017: 47,288
2018: 38,418
SM 64,200
TP
mg/L
2.8
6.5
0.3
TP Load
lb/mo
1,482
2,625
337
TP Load
(January 1- December 31)
lb/yr
17,966
16,901
18,944
YM 18,250
Dichlorobromomethane
µg/L
4.4
11.0
< 1.0
Total Antimony
µg/L
27
38
3
Page 3 of 13

Parameter
Units
Average
Max
Min
Permit
Limit
Total Copper
µg/L
43
16
Total Silver
µg/L
All values < 1
1 MA = Monthly Average, WA = Weekly Average, DA = Daily Average, DM = Daily Maximum, SM =
Summer Maximum, YM = Yearly Maximum.
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/l of instream standard at full permitted flow; 2) to verify
model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other instream
concerns. Instream monitoring may be conducted by the Permittee, and there are also Monitoring Coalitions
established in several basins that conduct instream sampling for the Permittee (in which case instream
monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this permit
action: The current permit requires instream monitoring for Dissolved Oxygen (DO), Temperature, and
Conductivity. Instream monitoring locations are at the NC Hwy 27 bridge (upstream) and just below the
NC Hwy 29 / NC Hwy 74 bridge (downstream).
Instream DO remains in the permit as a parameter of concern for aquatic life. Review of submitted instream
data from June 2016 through January 2019 revealed similar patterns of DO values between up- and
downstream stations throughout the period examined, with summer minima dipping below the standard of
5 mg/L (15A NCAC 02B .02011) at both locations (upstream range: 4.5-12.4 mg/L; downstream range:
4.8-12.5 mg/L). Concurrent effluent values were lower than those at either instream location, especially
during winter months (range: 5.0-8.0 mg/L with one outlier at 3.7 mg/L).
Instream Temperature remains in the permit as a parameter of concern for aquatic life. Instream temperature
data for the period above showed similar patterns between up- and downstream locations, with summer
maxima consistently exceeding the 29°C standard for upper Piedmont and mountain waters (15A NCAC
02B .02011) (upstream range: 5.9-33.0 °C, downstream range: 7.0-33.0 °C). Downstream temperature
increased higher than the upper piedmont and mountain waters standard of 2.8°C above the upstream
temperature (15A NCAC 02B .02011) three out of 243 days measured; the highest increase was 3.9°C.
These increases were due to the discharge, but neither exceeded the 29°C stream temperature standard.
Concurrent effluent temperatures were also similar, but with lower summer maxima (range: 9.0-29.0 °C).
Instream Conductivity remains in the permit as a parameter of concern due to industrial dischargers.
Reviewed data showed measures between up- and downstream stations not to differ (parried sample t-test;
t = 0.697, p = 0.24; upstream range: 58.0-108 umhos/cm, downstream range: 58.0-96.5 umhos/cm).
Although the facility has a pretreatment program with four SIUs, conductivity is not monitored in the
effluent. The lack of difference between the two instream locations indicate that effluent is not having an
impact on the receiving waters, and therefore effluent conductivity does not need to be monitored.
Fecal Coliform is a parameter of concern for aquatic life and human health. Instream monitoring for Fecal
Coliform was previously in the permit, but 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 counts from February 2015 through January 2018 were
mostly well below limits, with a geometric mean of 8/100 mL, and the receiving stream is not impaired for
Page 4 of 13

coliform. Therefore, instream monitoring for Fecal Coliform is not needed and will not be reinserted into
the permit.
No changes are proposed for instream monitoring.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition:
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported three
coliform exceedences (2 weekly average and 1 monthly average) in June 2018, each generating a Notice of
Violation (NOV). Four DO values did not reach the daily minimum in December 2015, September 2016,
August 2017, and September 2018, generating one NOV (in 2015) and two Notices of Deficiency (NOD).
One pH measure in September 2016 did not reach the daily minimum, generating a NOD.
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 2/16/2017, 4/20/2017, 7/20/2014, 8/17/2014, plus the more recent tests run in
November 2016, August 2017, and February 2018.
Summarize the results from the most recent compliance inspection: The most recent facility inspection
conducted in January 13, 2018 reported that the facility was well maintained and operated.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixin=� Zones
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic
Life; non -carcinogen HIT); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B. 0204(b): NA
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
(e.g., BOD = 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
Ifpermit limits are more stringent than TBELs, describe how limits were developed: NA
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.
Page 5 of 13

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 reNain in the permit
as a limit.
The spreadsheet calculated NH3-N allowable concentrations of 13.0/26.0 mg/L summer/winter monthly
average (weekly averages were > 35.0 mg/L and thus required monitoring only). A review of submitted
effluent data from February 2015- January 2019 showed data to be well below allowable concentrations
(Fig. 1). Therefore, the monitor -only requirement for Ammonia will be maintained in the permit.
Effluent NH3 Allowable Concentrations (Cw)
4 WA MA MACw
30
25
20
J
E 15
10 •
5 0•
♦••• t
a \�t\T \y$\Totio \°\�°tip otiA � p
ti �
Figure 1. Effluent Ammonia -Nitrogen data against WLA-derived allowable concentrations.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of %2 detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between February 2015
and January 2019. 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:
Page 6 of 13

• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable water
quality standards/criteria: None.
• Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but
the maximum predicted concentration was > 50% of the allowable concentration: None.
• No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria
and the maximum predicted concentration was < 50% of the allowable concentration: Antimony,
Arsenic, Beryllium, Cadmium, Total Chromium, Copper, Cyanide, Bromodichloromethane, Lead,
Molybdenum, Nickel, Phenol, Selenium, Silver, Zinc.
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern. Bromoform, Dibromochloromethane.
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.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits,
using single concentration screening tests, with multiple dilution follow-up upon a test failure.
Describe proposed toxicity test requirement: This is a Major POTW, and a chronic WET limit at 6%
effluent concentration will continue on a quarterly frequency.
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.
Page 7 of 13

Table 2. Mercury Effluent Data Summary.
Parameter
2016
2017
2018
No. of Samples
1
4
4
Annual Average Conc. ng/L
18.2
4.5
3.8
Maximum Conc., ng/L
18.20
6.59
9.02
TBEL, ng/L
47
WQBEL, ng/L
195.9
Describe proposed permit actions based on mercury evaluation: The Mercury TMDL was implemented in
the 2015 NPDES permit modification with removal of previous mercury limits and insertion of a Mercury
Minimization Plan (MMP) special condition based on evaluation of data collected from 2011-2014 and
facility size. The Permittee has developed and submitted the required Mercury Minimization Plan, dated
July 2015. 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 2). Because the facility is greater than 2 MGD and has reported quantifiable levels of mercury
(> 1 ng/L), the Mercury Minimization Plan special condition will be modified to maintain the plan.
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 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 (Mt, Holly, Belmont and the former Clariant Corp. WWTPs) to one future regional WWTP 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 Mt. Holly WWTP and Belmont WWTP until Charlotte's regional
WWTP and the connections from Mt. Holly and Belmont collection systems to it are constructed. After
construction of the regional WWTP 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 load
allocations and limits were modified in the permit to include allocations transferred from the former Clariant
WWTP (Table 3).
Page 8 of 13

Table 3. Proposed nutrient load limit and monitoring requirements.
Parameter
Limit
Monitoring Frequency
Total Nitrogen Load, summer
111,9731b/season
Monthly
Total Nitrogen Load, winter
124,3451b/season
Monthly
Total Phosphorus Load, annual
31,4051b/yr
Monthly
Other WOBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs:
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with 15A
NCAC 2H. 0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B. 0226 for this permit renewal: NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals (if not =licable, delete and skip to Industrials]
Are'concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/L
BOD.sITSS for Monthly Average, and 45 mg/L for BODs/TSS for Weekly Average). YES
If NO, provide a justification for alternative limitations (e.g., waste stabilization pond). NA
Are 85% removal requirements for BOD51TSS included in the permit? YES
If NO, provide a justification (e.g., waste stabilization pond). NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit must
document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all cases,
existing instream water uses and the level of water quality necessary to protect the existing use is maintained
and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA
9. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
Page 9 of 13

reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated: NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following regulations
and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2) NPDES
Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance, Reduced
Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best Professional
Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not considered
effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -backsliding
prohibitions would not be triggered by reductions in monitoring frequencies.
No parameters have reduced monitoring frequencies.
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
WQBEL. Required to calculate
Total Monthly
monthly based TN/TP nutrient
Flow (MG/mo)
Monitor monthly
No Change
mass limits compliance with
Lake Wylie TMDL permitting
strategy.
MA 30.0 mg/L
TBEL. Secondary treatment
BOD5
WA 45.0 mg/L
No change
standards / 40 CFR 133 / 15A
NCAC 2B .0406.
Page 10 of 13

Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Total Suspended
MA 30.0 mg/L
TBEL. Secondary treatment
Solids (TSS)
WA 45.0 mg/L
No change
standards / 40 CFR 133 / 15A
NCAC 2B .0406.
WLA-calculated allowable
concentrations (MA = 13.0/26.0
mg/L summer/winter) are well
NH3-N
Monitor 3/week
No change
above effluent data (average = 0.85
mg/L). No history of NH3 limits;
allowable concentrations are near or
above guidance criteria. 15A
NCAC 2B .0505
Fecal Coliform
MA 200 /100 mL
No change
WQBEL. State WQ standard,
WA 400 /100 mL
15A NCAC 2B.0200.
Total Residual
DM 28 µg/L
No change
WQBEL. State WQ standard,
Chlorine (TRC)
15A NCAC 2B.0200.
Dissolved
DA > 5 mg/L
No change
WQBEL. State WQ standard,
Oxygen (DO)
—
15A NCAC 2B.0200.
Temperature (IQ
Monitor Daily
No change
15A NCAC 2B .0505
pH
6.0 - 9.0 SU
No change
WQBEL. State WQ standard,
15A NCAC 2B.0200.
WQBEL. Required to monitor N
species and to calculate TN load
Total Nitrogen
for limit compliance per Lake
(TN) (=TKN +
Monitor Weekly
No change
Wylie TMDL permitting
NO2-N + NO3-N)
strategy, and to comply with NC
Chlorophyll -a WQS. 15A NCAC
2B.0200.
WQBEL. Required TN mass
SM 64,200 lb/summer
allocation per Lake Wylie TMDL
(Apr 1 — Oct 31).
Summer 111,973 lb
permitting strategy. Nutrient
TN Load
Effective 4/1/2017
Winter 124,345 lb
allocation transfer from Clariant
Monitor Monthly
Corp. by City of Charlotte to
Mount Holly per agreement,
5/3/2018.
WQBEL. Required to calculate
TP load for limit compliance per
Total Phosphorus
Monitor Weekly
No change
Lake Wylie TMDL permitting
UP)
strategy, and to comply with NC
Chlorophyll -a WQS. 15A NCAC
2B.0200.
Page 11 of 13

Parameter
Current Permit
Proposed Change
Basis for Condition/Change
WQBEL. Required TP allocation
per Lake Wylie TMDL
YM 18,250 lb/yr
permitting strategy. Nutrient
TP Load
Effective 1/1/2015
YM 31,405 lb/yr
allocation transfer from Clariant
Monitor Monthly
Corp. by City of Charlotte to
Mount Holly per agreement,
5/3/2018.
Chronic limit 6%
WQBEL. No toxics in toxic
Toxicity Test
effluent
No change
amounts. 15A NCAC 213.0200
and 15A NCAC 2B.0500.
Monitor effluent and
Revised water quality standards and
Total Hardness
No requirement
instream, upstream of
EPA's guidance on hardness -
discharge
dependent metals.
Bromodichloro-
WQBEL. RPA yielded no
methane
Monitor Quarterly
Remove from permit
reasonable potential to exceed
allowable Cw.
WQBEL. RPA yielded no
Total Antimony
Monitor Quarterly
Remove from permit
reasonable potential to exceed
allowable Cw.
WQBEL. RPA yielded no
Total Copper
Monitor Quarterly
Remove from permit
reasonable potential to exceed
allowable Cw.
WQBEL. RPA yielded no
Total Silver
Monitor Quarterly
Remove from permit
reasonable potential to exceed
allowable Cw.
Total Mercury
MMP Special
Modify condition to
MMP report submitted.
Condition
maintain MMP
Reduce to three
Effluent
Annual
times per permit
cycle, add second
40 CFR 122 permit renewal
Pollutant Scan
species toxicity
application requirement.
testing condition
Electronic
No requirement
Add to permit
In accordance with EPA
Reporting
Electronic Reporting Rule 2015.
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: 08/23/2019
Page 12 of 13

Per 15A NCAC 211.0109 & .0111, The Division will receive comments for a period of 30 days following
the publication date of the public notice. Any request for a public hearing shall be submitted to the Director
within the 30 days comment period indicating the interest of the party filing such request and the reasons
why a hearing is warranted.
14. NPDES Division Contact:
If you have questions regarding any of the above information or on the attached permit, please contact Gary
Perlmutter at [phone] or via email at [e-mail].
15. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): NO; DEQ Moorevville
Regional Office Public Water Supply staff concurs with issuance of the permit. No comments were received
from the USEPA, the Permittee, the DEQ Regional Office, nor any other party.
If Yes, list changes and their basis below: NA
16. Fact Sheet Attachments (if applicable):
• PERCS Information Request form, completed
• NC Final 2018 303(d) list, p. 39
• Effluent monitoring charts and summary tables
• BOD and TSS Removal summary sheets
• Instream monitoring data
• Monitoring Violations Report
• WET test summary, p. 67
• Water Compliance Inspection Report, 1/13/2018
• NH3/TRC WLA Calculation sheet
• RPA Spreadsheet Summary
• RPA Dissolved Metals Calculator sheet
• Dissolved Metals Implementation/Freshwater Standards
• Mt Holly MMP
• Mercury TMDL Evaluation data and summary table
• Nutrient Allocation Transfer Agreement
• Projected Nitrogen and Phosphorus Limits — Lake Wylie Nutrients TMDL
• PWS memo, completed by Mooresville Regional Office
Page 13 of 13

NPDES/Ac, uifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
PERMIT WRITERS - AFTER you not this form back
Check all that apply from PERCS:
- Notify PERCS if LTMP/STMP data we said should be
Date Of Reg uest 12/12/2017
municipal renewal x on DMRs is not really there, so we can get it for you
Re uestor Ron Berry
new industries (or NOV POTW).
Facility Name Mount Holly WWTP
WWTP expansion - Notify PERCS if you want us to keep a specific POC
Permit Number NCO021156
Speculative limits in LTMP/STMP so you will have data for next permit
Region Mooresville
renewal.
stream redass. - Email PERCS draft permit, fact sheet, RPA.
Basin Catawba
outfall relocation - Send PERCS paper copy of permit (w/o NPDES
7Q10 change boilerplate), cover letter, final fact sheet. Email RPA if
other changes.
other,
check applicable PERCS staff:
Other Comments to PERC:
BIRD, CPF, CTB, FRB, TAR- Sarah Bass{807-6310) Only need data from June 2016 through 2017
X Vivian Zhon
CHO, HIW, LTN, LUM, NES, NEW, ROA, YAD
- Monit Hassan 807-6314
PERCS PRETREATMENT STAFF COMPLETES THIS PART:
Status of Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment Program
X 3) facility has SIUs and DWQ approved Pretreatment Program (list "DEV' if program still under development)
X 3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
Flow, MGD Permitted Actual
Time period for Actual STMP time frame:
Industrial
1.6
0.9706
1/1/2016 - 12/31/2016
Most recent:
We
1.051
1/1/2017-10/31/2017
Next Cycle:
Uncontrollable
e<
� d
Parameter of
POC due to
NPDES/ Non-
Required by
Required
POC due
POTW POC
STMP LTMP
c
rn
Concern (POC)
Disch Permit
EPA
by 503
to Slu***
(Explain
Effluent Effluent
Check List
Limit
Sludge**
below)*"'"
Freq Freq
i Q = Quarterly
M = Monthly
BOD
X
T Q
Q
TSS
X
NH3
X
Q
Arsenic
X
Q
Cadmium
X
Q
Chromium
X
Q
v
Coeper
X
Q
Cyanide
X
Q
Is all data on DMRs?
Lead
X
Q
YES
IX
Mercury
X
Q
NO attach data
Molybdenum
X
Q
Nickel
N
X
Q
Silver
X
Q
Selenium
X
Q
Zinc
X
Q
Is data inspreadsheet?
Total Nitrogen
X
Q
YES email to writer
Phosphorus
X
Q
NO
X
*Always in the LTMP/STMP
** Only in LTMP/STMP if sludge land app or composte (dif POCs for incinerators)
*** Only in LTMP/STMP while SIU still discharges to POTW **** Only in LTMP/STMP when pollutant is still of concern to POTW
Comments to Permit Writer (ex., explanation of any
POCs:_ info you have on IU related investigations into NPDES problemsl:
Also sampling for antimony; Dichlorobromomethane (bromodichloromethane), Phenol, Surfactants (MBAS)
PERC NPDES_Pretreatment.request.forml2 2017
Revised: July 24, 2007

c
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\

Mount Holly WWTP Effluent Monitroing
NCO021156
Flow
Mo Avg Limit
4.5
4.0
3.5
3.02.5
•
•
• • •
g 2.0 i ••••••• �••••••••�•••••� ••�•• �••••••• ••
1.5
1.0
0.5
0.0 y
00
%V O,^ O,^ OHO gV 0
IbO' titi\tip\� \ti\%,\tip\� 3 4\tip\~ t-? do\�1\v h\tih\�
Biological Oxygen Demand (BOD)
Wk Avg Mo Avg WA Limit MA Limit
50.0
45.0
40.0
35.0
30.0
obi 1 25.0
E 20.0
15.0
10.0
5.0.i►a
.�
aw`w�a+
wswww,►.,
0.0
Otia OyA
O~h Oti0 Oti'
Oti1 011
010 Oti0 Oti0
b\ti0\'L titi\��\'Y
1\1y\'L ti\3,y\'L O\1
3\O\'L O
Total Suspended Solids (TSS)
Wk Avg
Mo Avg
WA Limit
MA Limit
50
45
40
35
30
'81 25
E 20
AA,
AAA 0A
Ais
0 - -
,yb
(o
,''\
�o\ti0\~O,yA
ti
1\tih\�O,yy
'y\�1\~O•y�\tip\�O,y`o
o�\tip\�O,y'\
p\10\�Oy�
O\tip\�O•y0 �i\tiy\�O,yoi
ti
Summary Statistics
Daily Avg
Mo. Total
n
1442
48
Average 2.143
64.366
SD
0.576
9.105
Min
0.718
51.493
Max
7.662
99.956
Summary
Statistics
n
1000
Average
5.3
SD
4.0
Min
2.000
Max
52.0
Summary_
Statistics
n
1002
Average
13.75
SD
7.07
Min
2.00
Max
96.00
Page 1 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP Effluent Monitroing NCO021156
Ammonia -Nitrogen (NH3-N)
18
16
14
12 •'
obi 10
E s •"
6 ••
4 •� ' ' '
• ems: �••
o\tio�L o~� ti\tioyy ti\tioyo o\tio�o �\tioyA ti\tioy^ o\tio10 �\tio10 h\tio10
o\ti 491,
Fecal Coliform
Wk Avg Mo Avg
WA Limit MA Limit
1,000
s
•
s
E
o
o
100
s •
c s
� • s
• •s
s ss � •
ss • • �
10
s
s A•! + • i
fi t•
s
a� s Ais * •�
�,, . •
%
•
• �
ra _ :
1
-
- -A-
�o\tio\vo•,d
ti\tip\�oy�\�'�\�o1y ti\3\ti$\
N,
3\0\�0NI oo1� a\tio\�oyo o\tip\~oyo h\tiy\�oye
1
Total Residual Chlorine (TRC)
Effluent Limit CompWnt
60 -
50
-- •
•� � • i° ■� w r �f
�'
s i
-
S
J 40
• ' • /• .
Z
.
5 30
i
o
20
ter■
•«.
10
•
0
10\Po'b
�0\1o\soya ti\�1\�oyb
1
''\�\�oy� \tip\�oy�
\1�\�oyh ti\�'1\ryp
ti
Summary
Statistics
n
626
Average
0.85
SD
2.14
Min
0.10
Max
17.00
Summary
Statistics
n
999
Geomean
8
Min
1
Max
6488
Summary
Statistics
n
999
Average
29
SD
8
Min
10
Max
50
Page 2 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP Effluent Monitroing NCO021156
Dissolved Oxygen (DO)
• Effluent -Limit
9.0
8.0 •�
7.0 •
J
nil 6.0 ■
E %_ &_MAk6&&
5.0 `
4.0 •
3.0 - -- — -
A ^ o\ti\tioy� h\�oyy ti\�oyo o\tioyo �o\tio1ti\�o~o\tio1� \noy� ti\Toyo
(.0 ��\ti ,�\ti ti\3 \ti \ \ti b\ti yo\ti y\ti
35
30
25
20
U
15
10
5
0
oti°`
oti�
o\ti
�\ti
10V
ti\�
ti
Temperature
oti�' otio oti�O o'� oti� otiI d0b oti121
\10\,%o
pH
• Effluent L. Limit U. Limit
10.0
9.0 —
8.0
7.0we—
■
6.0 - - - -----� ■_•
5.0
4.0 --
O,O O,O 5S O,1 00 Z; O,� O,O
o\�o\ti 1�\',�\ti\yy\ti 1\�1\ti\1o\ti\6\ti o\�ti\ti a\yo\ti yo\�,�\ti y\�h\ti
Summary
Statistics_
n
789
Average
5.93
SD
0.74
Min
3.72
Max
8.20
Summary
Statistics
n
1000
Average
19.17
SD
5.21
Min
6.00
Max
29.00
Summary
Statistics
n
1000
Average
6.92
S D
0.35
Min
5.70
Max
7.60
Page 3 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP Effluent Monitroing NCO021156
Total Nitrogen (TN)
TO NO2+NO3 ♦ TN
50
45
40
35
30
obi 25
E 20
15
10
5
0
O\��yA 1\ti�ya h\ti�1y ti\ti�y�\ti�y�\tiny^ A
ti\ti�1
25,000
20,000
0QN QN
ZIP
A\O\~ O\�A\'P
y
h
TKN
NO2+NO3
TN
n
211
211
211
Average
2.6
14.8
17.2
S D
3.6
8.8
8.2
Min
0.1
0.0
1.5
Max
30.0
36.0
46.0
TN Load
0 15,000 ♦ yA#
E ♦ ♦ ♦ A#♦
i 10,000 ♦ A►
♦ ♦♦♦ AAA A
5,000 ♦ ♦ ♦ ♦♦♦♦
0
yoyA 'yh y0 ,y0 y1 y1 ,yw ,�q, y0
Ib/mo Ib/summer*
n
48
4
Average
9,336
67,756
SD
4,214
30,610
Min
1,473
38,418
Max
19,187
104,719
*Effective 4/1/2017; 2017 summer = 47,288 lb; 2018 summer = 38,418 lb
Page 4 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Effluent Monitroing
Total Phosphorus (TP)
7
6
5
•
• Ib '
a
•
• .. • •• • 'i
•
Summa.. ):
Statistics
B
•". • •. Y',r' • •
•
n
215
3
y • •••
OPdo :Wep • •
•� • •.6
Average
SD
2.80
1.20
• •
' Ip
' • '
•
Min
0.25
1
�� •
Max
6.50
0
yo\soya �1\soya yy\�oyh 3o \T y�\�oy�o lb\'V �`�oyA o\Toys \ryoy� y\�oy0,
o\ yti\
�\ y\ w\ 3\ h\y
TP Load
3,000
2,500.
2,000
u
� 1,500
AA
1,000
♦♦ ♦ ♦
u
500
y♦
0
—
a
— —
ya
yA yh ye y� y� y'1 y00 y0 y�1
�JtQec, �J� ,ao PJoc lac 5e� PQc OL`. �aa
ib/mo
Ib/yr
n
49
4
Average
1,482
17,966
SD
499
976
Min
337
16,901
Max
2,625
18,944
NCO021156
I
Page 5 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP Effluent Monitroing NCO021156
Dichlorobromomethane
12.0
10.0
8.0
J
mod 6.0
4.0
2.0
Y
V
0.0
-
-
o\tio\�o�a
ti\tit\�oyb
ti
�\tiy\�p1y
ti\''y\~o16
ti
Total Antimony
40
35
30
25
J
0� 20
15
10
5
0
�y
p
pA
A
VO
'00
Yp\�p1�
L1\Tp1�
yy\�p1oi
030
Summary
Statistics
n
16
Average
4.35
SD
1.7
Min
1.00
Max
6.3
Summary
Statistics
n
16
Average
26.6
SD
7.9
Min
3.0
Max
38.0
Total Copper
50
45
40
Summary
Statistics_
n
13
35
30
Average
25.92
J
'�b 25
�-
s
SD
6.53
20
•�
.'
Min
18.00
15
Max
43.00
10
5
0
0
O,A O,� O,
ro\ti0\'L\'L
o,\tit A\ti0\L
Page 6 G.B. Perlmutter, rev. 3/8/2019

Mount Holly VWNTP Effluent Monitoring NCO021156
Outpuf
Monthly BOD Average Result
Month
Influent
Effluent
Removal Rate (%)
January-12
163.00
7.33
95.50
February-12
140.45
8.63
93.85
March-12
145.67
9.25
93.65
April-12
178.00
5.34
97.00
May-12
175.23
4.17
97.62
June-12
217.27
3.11
98.57
July-12
167.52
4.30
97.43
August-12
159.29
4.73
97.03
September-12
171.36
6.83
96.02
October-12
167.63
7.10
95.76
November-12
151.50
7.02
95.37
December-12
148.26
6.06
95.91
January-13
175.95
7.70
95.62
February-13
173.64
10.65
93.86
March-13
165.90
5.00
96.98
April-13
165.10
8.09
95.10
May-13
163.82
5.05
96.92
June-13
159.00
2.96
98.14
July-13
156.96
2.39
98.48
August-13
147.57
2.50
98.31
September-13
138.57
3.20
97.69
October-13
168.60
3.35
98.02
November-13
178.42
3.33
98.14
December-13
170.95
5.38
96.85
January-14
179.25
5.76
96.79
February-14
193.91
4.88
97.48
March-14
163.37
4.24
97.40
April-14
152.50
4.55
97.01
May-14
155.95
4.21
97.30
June-14
173.40
4.14
97.61
July-14
151.48
3.02
98.01
August-14
145.00
2.17
98.50
September-14
179.09
2.13
98.81
October-14
185.79
4.78
97.42
November-14
191.05
7.80
95.92
December-14
226.19
12.67
94.40
January-15
188.00
11.56
93.85
February-15
142.38
9.73
93.16
March-15
145.14
8.54
94.12
April-15
155.27
4.07
97.38
May-15
142.86
4.34
96.96
June-15
131.24
2.65
97.98
July-15
139.57
1.49
98.93
August-15
140.26
2.30
98.36
September-15
136.83
2.69
98.03
October-15
172.35
4.15
97.60
November-15
147.28
3.71
97.48
December-15
136.00
3.57
97.37
January-16
February-16
Summary
Statistics
n
48
Average
96.8
SD
1.5
Min
93.2
Max _
98.9

Mt Holly WWTP Effluent Monitoring NCO021156
Output
Monthly TSS Average Result
Month
Influent
Effluent
Removal Rate (%)
January-12
187.20
18.40
90.17
February-12
195.55
18.50
90.54
March-12
197.57
25.57
87.06
April-12
208.50
16.70
91.99
May-12
181.45
12.86
92.91
June-12
179.00
14.18
92.08
July-12
278.38
13.62
95.11
August-12
192.10
18.81
90.21
September-12
156.27
22.82
85.40
October-12
168.53
17.47
89.63
November-12
200.50
15.30
92.37
December-12
158.84
14.53
90.85
January-13
176.10
12.67
92.81
February-13
325.18
13.23
95.93
March-13
277.33
13.05
95.30
April-13
314.00
21.62
93.11
May-13
237.64
14.59
93.86
June-13
184.00
11.30
93.86
July-13
181.74
12.91
92.89
August-13
245.05
15.14
93.82
September-13
190.67
18.29
90.41
October-13
194.90
14.95
92.33
November-13
196.74
12.53
93.63
December-13
213.50
15.50
92.74
January-14
234.80
12.55
94.66
February-14
219.83
11.61
94.72
March-14
199.58
10.16
94.91
April-14
187.64
9.23
95.08
May-14
188.18
8.45
95.51
June-14
166.30
8.00
95.19
July-14
190.17
5.43
97.14
August-14
187.80
7.45
96.03
September-14
151.36
9.73
93.57
October-14
173.26
12.79
92.62
November-14
182.00
19.16
89.47
December-14
183.24
20.07
89.05
January-15
209.80
23.17
88.96
February-15
187.81
22.10
88.24
March-15
200.76
18.74
90.67
April-15
185.18
7.90
95.73
May-15
162.67
6.38
96.08
June-15
153.90
4.91
96.81
July-15
151.83
3.33
97.80
August-15
158.32
6.47
95.91
September-15
172.35
8.57
95.03
October-15
173.60
10.22
94.12
November-15
165.22
11.13
93.27
December-15
180.38
10.35
94.26
January-16
February-16
Summary Statistics
n
48
Average
93.0
SD
2.7
Min
85.4
Max
97.8

Mount Holly WWTP Instream Monitoring
NCO021156
Dissolved Oxygen (DO)
O Upstream > Effluent Dnstream Standard
14
12 004w'o 9
10
8 �� M
E 6
4 ■
2
0
O,O O,O OOOO,�
ti\�1\� ��1�\~ ti 4�~�\� a�tio\� ti
35
30
25
20
u
15
10
5
0
do
ti^1
Summary Statistics
Upstream
Effluent
Downstream
n
243
241
243
Average
7.4
5.6
7.7
SD
1.9
0.6
1.7
Min
4.5
3.72
4.8
Max
12.4
8
12.5
Temperature
Upstream Effluent Dnstream Standard
L.
r
ono
oti�
oti�
oti00
1
Summary Statistics
Upstream
Effluent Dnstream
D-U diff
n
243
241
243
243
Average
24.0
22.0
24.3
0.3
SD
7.0
4.6
7.2
1.0
Min
5.9
9
7
-6
Max
33
29
33
3.9
Number occurrences
of D-U > 2.8 'C:
j 31
Page 1
GB Perlmutter, 3/8/2019

Mount Holly WWTP Instream Monitoring NCO021156
Conductivity
Upstream Dnstream
120
100 0 o a°000
♦ o
E 80 «`• �♦ ♦ � o
0 60 fit: - ' ♦o
r op
E 40
20
0 -
O,b O,�
y\�ti�ti �\1��ti �\��ti ��ti~\~ �\yo\T O�ti1\~ 4T
ti
Summary Statistics
U stream
Dnstream
n
165
165
Average
66.1
65.8
SD
7.5
5.8
Min
58.0
58.0
Max
108.0
96.5
t-Test: Paired Two Sample for Means
(upstream outlier removed)
_
Upstream
Dnstream
Mean
66.1303
65.75273
Variance
56.44847
33.618
Observations
165
165
Pearson Correlation
0.477394
Hypothesized Mean Di
0
df
164
t Stat
0.696616
P(T<=t) one -tail
0.243515
t Critical one -tail
1.654198
P(T<=t) two -tail
0.487029
t Critical two -tail
1.974535
Conclusion: no difference detected.
Page 2 GB Perlmutter, 3/8/2019

Mount Holly WWTP
NCO021156
00300 - Oxygen,
Dissolved 00) mucjlL]
Month
Day
Year
Date
6
1
2016
6/1 /2016
6
3
2016
6/3/2016
6
6
2016
6/6/2016
6
8
2016
6/8/2016
6
10
2016
6/10/2016
6
13
2016
6/13/2016
6
15
2016
6/15/2016
6
17
2016
6/17/2016
6
20
2016
6/20/2016
6
22
2016
6/22/2016
6
23
2016
6/23/2016
6
27
2016
6/27/2016
6
29
2016
6/29/2016
7
1
2016
7/1 /2016
7
5
2016
7/5/2016
7
6
2016
7/6/2016
7
8
2016
7/8/2016
7
11
2016
7/11/2016
7
14
2016
7/14/2016
7
15
2016
7/15/2016
7
18
2016
7/18/2016
7
20
2016
7/20/2016
7
22
2016
7/22/2016
7
25
2016
7/25/2016
7
27
2016.
7/27/2016
7
29
2016
7/29/2016
8
1
2016
8/1/2016
8
3
2016
8/3/2016
8
5
2016
8/5/2016
8
8
2016
8/8/2016
8
10
2016
8/10/2016
8
12
2016
8/12/2016
8
15
2016
8/15/2016
8
17
2016
8/17/2016
8
19
2016
8/19/2016
8
22
2016
8/22/2016
8
24
2016
8/24/2016
8
26
2016
8/26/2016
8
29
2016
8/29/2016
8
31
2016
8/31 /2016
9
2
2016
9/2/2016
9
6
2016
9/6/2016
9
7
2016
9/7/2016
9
9
2016
9/9/2016
9
12
2016
9/12/2016
9
14
2016
9/14/2016
9
16
2016
9/16/2016
9
19
2016
9/19/2016
9
21
2016
9/21 /2016
9
23
2016
9/23/2016
9
27
2016
9/27/2016
9
28
2016
9/28/2016
9
30
2016
9/30/2016
Upstream Effluent
6.7 5.5
7.5 5.8
7.3 5.9
5.5 6
6.2 6.8
7.9 5.6
6.7 6.1
6.3 5.8
5.9 6
5 6.2
6 5.9
6 5.7
6.6 6
6.2 6.2
6.6 5.8
6.8 5.9
7.4 6.3
5.3 6.2
5.9 5.7
5.4 5.6
6.6 5.4
6.1 5.7
6.5 5.9
6.1 5.5
6.8 5.5
5.2 5.5
6.4 6
4.6 5.8
6.6 5.8
5.8 5.5
6.7 5.9
5.5 6
5.7 5.4
6.7 5.8
6.6 6
4.5 5.9
5 6
6.4 5.8
6.3 6.2
6.2 5.7
6.5 5.7
5.4 5.9
6.1 6.2
6.7 6.2
6.5 6.1
4.8 5.5
6 5.6
6.2 7.6
6 5.6
5.4 5.5
5.6 5
5.9 6.1
6.5 6.1
Dnstream Standard
7.7 5
7.7 5
6.4 5
7.3 5
7.7 5
6.8 5
7.1 5
6.8 5
6.6 5
6 5
6.6 5
6.6 5
6.3 5
6.7 5
6.9 5
7.3 5
7.5 5
7.3 5
6.7 5
7.2 5
7 5
6.9 5
7.7 5
6.8 5
7.1 5
6.2 5
6.8 5
4.8 5
6.8 5
6.4 5
7.5 5
6.9 5
6.4 5
7.1 5
7.2 5
6.7 5
6.4 5
7 5
6.9 5
6.5 5
6.4 5
7 5
6.6 5
7 5
7.3 5
6.5 5
6.8 5
6.9 5
6.7 5
6.7 5
6 5
6.5 5
6.9 5
Page 39 GB Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00300 - Qxraen. Dissolved 00) lmQ2
Month Day
Year---
Date--
10
5
2016
10/5/2016
10
12
2016
10/12/2016
10
19
2016
10/19/2016
10
26
2016
10/26/2016
11
2
2016
11 /2/2016
11
10
2016
11/10/2016
11
17
2016
11/17/2016
11
23
2016
11/23/2016
11
30
2016
11 /30/2016
12
7
2016
12/7/2016
12
14
2016
12/14/2016
12
21
2016
12/21 /2016
12
28
2016
12/28/2016
1
6
2017
1 /6/2017
1
11
2017
1/11/2017
1
18
2017
1/18/2017
1
25
2017
1 /25/2017
2
1
2017
2/1/2017
2
8
2017
2/8/2017
2
17
2017
2/17/2017
2
22
2017
2/22/2017
3
1
2017
3/1/2017
3
8
2017
3/8/2017
3
16
2017
3/16/2017
3
23
2017
3/23/2017
3
29
2017
3/29/2017
4
6
2017
4/6/2017
4
12
2017
4/12/2017
4
19
2017
4/19/2017
4
26
2017
4/26/2017
5
3
2017
5/3/2017
5
10
2017
5/10/2017
5
16
2017
5/16/2017
5
24
2017
5/24/2017
5
31
2017
5131 /2017
6
6
2017
6/6/2017
6
7
2017
6/7/2017
6
9
2017
6/9/2017
6
12
2017
6/12/2017
6
14
2017
6/14/2017
6
16
2017
6/16/2017
6
19
2017
6/19/2017
6
20
2017
6/20/2017
6
22
2017
6/22/2017
6
26
2017
6/26/2017
6
28
2017
6/28/2017
6
30
2017
6/30/2017
7
3
2017
7/3/2017
7
5
2017
7/5/2017
7
7
2017
7/7/2017
7
10
2017
7/10/2017
7
11
2017
7/11/2017
7
14
2017
7/14/2017
Upstream Effluent
7 6.4
6 7.2
6 6.2
7.5 7.4
7.4 6.1
8.3 6.7
8.7 6.7
8.8 6.9
9.3 6.6
10.5 6.9
9.6 6.6
12.1 7.2
11.2 6.5
11.5 6.9
11 7.2
12.2 6.4
10.5 6.1
10.5 5.6
11.4 5.8
10.6 6.4
11.3 6
10.2 5.8
9.4 5.8
11.1 6.2
9.6 5.8
9.1 5.4
10.2 5.4
7.8 5.8
7.3 5.6
9.1 5.3
8.1 5.6
6.1 5.6
7.3 5.4
7.4 5
7.2 5.4
4.8 5.1
6.3 5
6 5.2
6.3 5
5.5 5.2
5.9 5
6.99 5
6.75 5
7.95 5.2
6.3 5
5.4 5.2
6.2 5.1
5.8 5.1
5.5 5.3
5.6 5.2
5 5.3
4.8 5.1
5.2 5
Dnstream Standard
7.8 5
7.5 5
7.4 5
7.7 5
8 5
8.7 5
8.9 5
9 5
9.1 5
9.8 5
9.3 5
11.2 5
10.8 5
10.5 5
11 5
11.8 5
9.4 5
10.8 5
10.1 5
11.8 5
11.6 5
10.3 5
9.9 5
11.3 5
10.1 5
8.5 5
8.9 5
9 5
8.2 5
7.8 5
8 5
7.2 5
7.4 5
7.3 5
7.3 5
5.8 5
6.5 5
6.9 5
7.8 5
5.4 5
6.2 5
7.55 5
6.67 5
7.91 5
6.6 5
6.3 5
7.1 5
5.6 5
6.1 5
6.1 5
6.3 5
4.9 5
6.3 5
Page 40 GB Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NC0021156
00300 - OxvQen. Dissolved (DO) /ma/L
Month Day
Year
Date
7
17
2017
7/17/2017
7
19
2017
7/19/2017
7
21
2017
7/21 /2017
7
24
2017
7/24/2017
7
26
2017
7/26/2017
7
28
2017
7/28/2017
7
31
2017
7/31 /2017
8
2
2017
8/2/2017
8
4
2017
8/4/2017
8
7
2017
8/7/2017
8
9
2017
8/9/2017
8
11
2017
8/11 /2017
8
14
2017
8/14/2017
8
15
2017
8/15/2017
8
18
2017
8/18/2017
8
21
2017
8/21 /2017
8
23
2017
8/23/2017
8
25
2017
8/25/2017
8
28
2017
8/28/2017
8
30
2017
8/30/2017
9
1
2017
9/1/2017
9
5
2017
9/5/2017
9
6
2017
9/6/2017
9
8
2017
9/8/2017
9
11
2017
9/11 /2017
9
13
2017
9/13/2017
9
15
2017
9/15/2017
9
18
2017
9/18/2017
9
20
2017
9/20/2017
9
22
2017
9/22/2017
9
25
2017
9/25/2017
9
27
2017
9/27/2017
9
29
2017
9/29/2017
10
4
2017
10/4/2017
10
11
2017
10/11 /2017
10
18
2017
10/18/2017
10
24
2017
10/24/2017
11
2
2017
11 /2/2017
11
9
2017
11 /9/2017
11
16
2017
11/16/2017
11
22
2017
11 /22/2017
11
29
2017
11 /29/2017
12
6
2017
12/6/2017
12
14
2017
12/14/2017
12
18
2017
12/18/2017
12
27
2017
12/27/2017
1
2
2018
1 /2/2018
1
8
2018
1 /8/2018
1
19
2018
1 /19/2018
1
22
2018
1 /22/2018
1
29
2018
1 /29/2018
2
5
2018
2/5/2018
2
12
2018
2/12/2018
Upstream Effluent
5.5 5
4.9 5
5.6 5
5 5.3
4.9 5.1
5.9 5.2
6.1 5.5
5.1 6.3
6.1 5.2
6.3 5.4
5.3 5.2
5 5.1
5.8 5.1
5.8 5.1
4.8 5
4.6 5
4.9 5
4.6 5
5.6 5.5
6.1 5.2
5.2 5.1
6.4 5.2
5.3 5.3
6.2 5.2
6.8 5.6
6.6 5.4
6.5 5.2
6.2 6.2
6.9 5.1
6.6 5
6.8 5.5
6.1 5.3
5.3 5.2
6.3 5.4
6.7 5.2
6.4 5.8
6.6 5.3
6.4 5.3
6.9 5.1
8.1 5.3
8.6 5.4
9.1 5.7
8.5 5.5
10.2 6
10.5 6
9.17
11.86 7.7
12.4 6.4
12 7.7
11.8 8
11.2 6.7
11.4 5.3
10.8 5.7
Dnstream Standard
6.3 5
5.4 5
5.3 5
5.4 5
5.3 5
6.3 5
5.9 5
6.2 5
6.9 5
6.6 5
5.9 5
5.3 5
6.2 5
6.8 5
5.4 5
5.6 5
6.1 5
5.7 5
6.2 5
6.5 5
5.6 5
6.5 5
5.4 5
6.1 5
7.2 5
7.6 5
7.1 5
7.4 5
6.3 5
6.8 5
7.2 5
7 5
6.8 5
6.5 5
5.8 5
6.7 5
7.1 5
6.8 5
7.1 5
8.2 5
9 5
9.3 5
8.3 5
10.4 5
10.3 5
8.98 5
11.2 5
12.5 5
12.1 5
11.5 5
11.1 5
11.7 5
10.9 5
Page 41 GB Perlmutter; rev. 3/8/2019

Mount Holly WWTP
NC0021156
00300 - Oxvicen. Dissolved (DO) (malL
Month Day
Year
Date
2
19
2018
2/19/2018
2
26
2018
2/26/2018
3
5
2018
3/5/2018
3
12
2018
3/12/2018
3
19
2018
3/19/2018
3
26
2018
3/26/2018
4
2
2018
4/2/2018
4
9
2018
4/9/2018
4
16
2018
4/16/2018
4
23
2018
4/23/2018
4
30
2018
4/30/2018
5
7
2018
5/7/2018
5
14
2018
5/14/2018
5
21
2018
5/21 /2018
5
29
2018
5/29/2018
6
4
2018
6/4/2018
6
5
2018
6/5/2018
6
7
2018
6/7/2018
6
11
2018
6/11/2018
6
12
2018
6/12/2018
6
14
2018
6/14/2018
6
18
2018
6/18/2018
6
19
2018
6/19/2018
6
21
2018
6/21 /2018
6
25
2018
6/25/2018
6
26
2018
6/26/2018
6
28
2018
6/28/2018
7
2
2018
7/2/2018
7
3
2018
7/3/2018
7
5
2018
7/5/2018
7
9
2018
7/9/2018
7
10
2018
7/10/2018
7
12
2018
7/12/2018
7
16
2018
7/16/2018
7
17
2018
7/17/2018
7
19
2018
7/19/2018
7
23
2018
7/23/2018
7
24
2018
7/24/2018
7
26
2018
7/26/2018
7
30
2018
7/30/2018
7
31
2018
7/31 /2018
8
2
2018
8/2/2018
8
6
2018
8/6/2018
8
7
2018
8/7/2018
8
9
2018
8/9/2018
8
13
2018
8/13/2018
8
14
2018
8/14/2018
8
16
2018
8/16/2018
8
20
2018
8/20/2018
8
21
2018
8/21 /2018
8
23
2018
8/23/2018
8
27
2018
8/27/2018
8
28
2018
8/28/2018
Upstream Effluent
10.4 5.8
9.77 5.4
9.8 5.8
10.5 5.6
9.9 5.3
9.9 5.5
10.6 5.6
10.1 6.1
9.56 5.6
9.87 5.9
9.26 5.4
9.01 5.7
8.74 5.6
8.34 5.1
8.16 5.3
8.06 5.1
8.1 5.1
7.02 5.1
7.6 5.1
8.1 5
7.88 5
7.86 5.1
6.81 5.1
6.52 5.2
6.52 5.2
6.79 5.2
6.8 5.1
6.36 5.3
6.59 5.2
6.57 5.5
6.63 5.6
6.68 5.1
6.82 5.2
6.97 5.2
6.64 5.1
6.7 5.2
6.65 5.1
6.31 5.1
6.41 5.1
6.73 5.1
6.68 5
6.19 5
6.39 5.1
6.41 5.2
6.4 5.3
6.31 5.2
6.55 5.1
6.17 5.2
6.5 5.1
6.37 5.1
6.65 5.2
7.29 5.1
6.67 5.1
Dnstream Standard
10.7 5
10 5
9.1 5
10.7 5
10 5
9.7 5
10.5 5
10.4 5
9.72 5
9.98 5
9.47 5
9.07 5
8.61 5
8.6 5
8.09 5
7.85 5
8.04 5
6.92 5
7.48 5
8.16 5
7.64 5
7.5 5
7.16 5
6.74 5
6.88 5
7.16 5
6.5 5
6.64 5
6.71 5
6.33 5
7.05 5
6.93 5
7.05 5
6.95 5
6.89 5
6.31 5
6.75 5
6.5 5
6.74 5
6.57 5
6.9 5
7.33 5
6.83 5
7.05 5
6.75 5
7.1 5
6.87 5
6.68 5
7.37 5
7.04 5
7.64 5
6.55 5
7.35 5
Page 42 GB Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00300 - Oxv4en. Dissolved IDOI (ma/L
Month Day
Year
Date
8
30
2018
8/30/2018
9
4
2018
9/4/2018
9
6
2018
9/6/2018
9
7
2018
9/7/2018
9
10
2018
9/10/2018
9
11
2018
9/11 /2018
9
13
2018
9/13/2018
9
17
2018
9/17/2018
9
18
2018
9/18/2018
9
20
2018
9/20/2018
9
24
2018
9/24/2018
9
25
2018
9/25/2018
9
27
2018
9/27/2018
10
1
2018
10/11/2018
10
8
2018
10/8/2018
10
15
2018
10/15/2018
10
22
2018
10/22/2018
10
29
2018
10/29/2018
11
5
2018
11 /5/2018
11
12
2018
11 /12/2018
11
19
2018
11 /19/2018
11
26
2018
11 /26/2018
12
3
2018
12/3/2018
12
11
2018
12/11 /2018
12
17
2018
12/17/2018
12
27
2018
12/27/2018
12
31
2018
12/31 /2018
1
7
2019
1 /7/2019
1
14
2019
1 /14/2019
1
21
2019
1 /21 /2019
1
28
2019
1 /28/2019
Upstream Effluent
6.93
5.1
6.64
5.2
6.88
5.1
6.21
5.1
6.19
5.2
6.36
5.2
7.17
5
6.27
3.72
6.93
5
6.31
5.3
6.21
5.2
6.36
5.4
6.39
5
6.45
5.2
6.7
5.3
8.66
5
7.35
6
7.85
5.3
8.41
5.8
9.21
6.2
10.3
5.5
9.83
6.3
10.3
5.6
10.5
6.4
10.6
6.2
11.1
5.6
10.1
5.6
11.3
5.7
11.4
6.1
11.4
11.4
5.6
Dnstream Standard
6.23
5
6.8
5
6.31
5
6.54
5
6.58
5
6.21
5
6.07
5
6.44
5
6.57
5
5.8
5
6.16
5
6.5
5
8.1
5
7.88
5
6.6
5
8.32
5
7.85
5
8.11
5
8.6
5
8.8
5
10.1
5
9.17
5
9.88
5
9.97
5
10.5
5
10.7
5
9.55
5
11.3
5
11.6
5
11.5
5
11.3
5
n
243
241
243
Average
7.4
5.6
7.7
SD
1.9
0.6
1.7
Min
4.5
3.7
4.8
Max
12.4
8.0
12.5
Page 43 GB Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00010 - Temperature. Water Deo_. Cent4grade
Month Day
Year
Date
Upstream Effluent
Dnstream Standard
D-U diff
6
1
2016
6/1 /2016
26
20
28
29
2
6
3
2016
6/3/2016
26
22
27
29
1
6
6
2016
6/6/2016
26
21
26
29
0
6
8
2016
6/8/2016
25
21
27
29
2
6
10
2016
6/10/2016
27
21
26
29
-1
6
13
2016
6/13/2016
28
24
30
29
2
6
15
2016
6/15/2016
28
24
29
29
1
6
17
2016
6/17/2016
28
24
29
29
1
6
20
2016
6/20/2016
27
24
28
29
1
6
22
2016
6/22/2016
28
22
29
29
1
6
23
2016
6/23/2016
29
24
30
29
1
6
27
2016
6/27/2016
30
23
30
29
0
6
29
2016
6/29/2016
29
20
29
29
0
7
1
2016
7/1 /2016
28
24
28
29
0
7
5
2016
7/5/2016
29
23
30
29
1
7
6
2016
7/6/2016
31
22
32
29
1
7
8
2016
7/8/2016
30
23
31
29
1
7
11
2016
7/11 /2016
31
22
32
29
1
7
14
2016
7/14/2016
32
22
33
29
1
7
15
2016
7/15/2016
32
25
32
29
0
7
18
2016
7/18/2016
32
23
32
29
0
7
20
2016
7/20/2016
32
25
32
29
0
7
22
2016
7/22/2016
31
25
32
29
1
7
25
2016
7/25/2016
33
24
33
29
0
7
27
2016
7/27/2016
32
23
33
29
1
7
29
2016
7/29/2016
32
24
33
29
1
8
1
2016
8/1/2016
33
25
33
29
0
8
3
2016
8/3/2016
29
22
29
29
0
8
5
2016
8/5/2016
30
24
31
29
1
8
8
2016
8/8/2016
30
22
30
29
0
8
10
2016
8/10/2016
30
25
30
29
0
8
12
2016
8/12/2016
30
26
31
29
1
8
15
2016
8/15/2016
31
25
33
29
2
8
17
2016
8/17/2016
32
25
32
29
0
8
19
2016
8/19/2016
31
24
32
29
1
8
22
2016
8/22/2016
30
21
31
29
1
8
24
2016
8/24/2016
30
21
30
29
0
8
26
2016
8/26/2016
31
24
32
29
1
8
29
2016
8/29/2016
31
24
31
29
0
8
31
2016
8/31 /2016
31
25
31
29
0
9
2
2016
9/2/2016
28
25
27
29
-1
9
6
2016
9/6/2016
29
22
30
29
1
9
7
2016
9/7/2016
29
21
30
29
1
9
9
2016
9/9/2016
29
24
30
29
1
9
12
2016
9/12/2016
28
23
28
29
0
9
14
2016
9/14/2016
31
24
31
29
0
9
16
2016
9/16/2016
30
25
30
29
0
9
19
2016
9/19/2016
29
20
30
29
1
9
21
2016
9/21 /2016
28
22
27
29
-1
9
23
2016
9/23/2016
27
23
26
29
-1
9
27
2016
9/27/2016
26
19
26
29
0
9
28
2016
9/28/2016
27
22
28
29
1
9
30
2016
9/30/2016
27
22
27
29
0
Page 39 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00010 - Temperature,
Water Deg. Centigrade
Month Day
Year
Date Upstream Effluent
Dnstream Standard
D-U diff
10
5
2016
10/5/2016
25
21
25
29
0
10
12
2016
10/12/2016
23
16
23
29
0
10
19
2016
10/19/2016
25
20
26
29
1
10
26
2016
10/26/2016
22
14
21
29
-1
11
2
2016
11 /2/2016
21
17
21
29
0
11
10
2016
11 /10/2016
19
15
18
29
-1
11
17
2016
11 /17/2016
17
15
17
29
0
11
23
2016
11 /23/2016
15
14
15
29
0
11
30
2016
11 /30/2016
15
19
17
29
2
12
7
2016
12/7/2016
14
19
14
29
0
12
14
2016
12/14/2016
13
13
11
29
-2
• 12
21
2016
12/21 /2016
10
9
13
29
3
12
28
2016
12/28/2016
12
13
14
29
2
1
6
2017
1 /6/2017
11
10
10
29
-1
1
11
2017
1/11/2017
9
11
9
29
0
1
18
2017
1 /18/2017
12
15
13
29
1
1
25
2017
1 /25/2017
12
12
12
29
0
2
1
2017
2/1/2017
12
13
12
29
0
2
8
2017
2/8/2017
12
16
12
29
0
2
17
2017
2/17/2017
11
14
12
29
1
2
22
2017
2/22/2017
14
17
15
29
1
3
1
2017
3/1/2017
16
17
15
29
-1
3
8
2017
3/8/2017
14
17
14.5
29
0.5
3
16
2017
3/16/2017
13
12
12
29
-1
3
23
2017
3/23/2017
14
17
14
29
0
3
29
2017
3/29/2017
19
20
21
29
2
4
6
2017
4/6/2017
16
16
17
29
1
4
12
2017
4/12/2017
19
20
19
29
0
4
19
2017
4/19/2017
19
20
19
29
0
4
26
2017
4/26/2017
20
18
20
29
0
5
3
2017
5/3/2017
21
21
21
29
0
5
10
2017
5/10/2017
19.7
20
20.7
29
1
5
16
2017
5/16/2017
23
21
24
29
1
5
24
2017
5/24/2017
23
21
23
29
0
5
31
2017
5/31 /2017
24
23
24
29
0
6
6
2017
6/6/2017
27
22
27
29
0
6
7
2017
6/7/2017
26
22
26
29
0
6
9
2017
6/9/2017
27
21
27
29
0
6
12
2017
6/12/2017
27
24
28
29
1
6
14
2017
6/14/2017
26
23
27
29
1
6
16
2017
6/16/2017
28
24
28
29
0
6
19
2017
6/19/2017
28
21
29
29
1
6
20
2017
6/20/2017
28
25
28
29
0
6
22
2017
6/22/2017
26.5
24
26.5
29
0
6
26
2017
6/26/2017
27
22
29
29
2
6
28
2017
6/28/2017
27
22
27
29
0
6
30
2017
6/30/2017
27
24
28
29
1
7
3
2017
7/3/2017
28
19
30
29
2
7
5
2017
7/5/2017
29
23
29
29
0
7
7
2017
7/7/2017
29
23
29
29
0
7
10
2017
7/10/2017
30
22
30
29
0
7
11
2017
7/11 /2017
28
24
29
29
1
7
14
2017
7/14/2017
30
25
31
29
1
Page 40 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00010 - Temperature,
Water Dea. Centigrade
Month Day
Year
Date
Upstream Effluent
Dnstream Standard
D-U dill
7
17
2017
7/17/2017
31
24
32
29
1
7
19
2017
7/19/2017
30
24
31
29
1
7
21
2017
7/21 /2017
32
25
32
29
0
7
24
2017
7/24/2017
30
25
30
29
0
7
26
2017
7/26/2017
29
26
30
29
1
7
28
2017
7/28/2017
30
27
31
29
1
7
31
2017
7/31 /2017
30
21
31
29
1
8
2
2017
8/2/2017
29
24
30
29
1
8
4
2017
8/4/2017
30
24
30
29
0
8
7
2017
8/7/2017
28
24
29
29
1
8
9
2017
8/9/2017
28
24
28
29
0
8
11
2017
8/11 /2017
28
25
29
29
1
8
14
2017
8/14/2017
30
24
31
29
1
8
15
2017
8/15/2017
30
21
31
29
1
8
18
2017
8/18/2017
30
24
30
29
0
8
21
2017
8/21 /2017
30
23
31
29
1
8
23
2017
8/23/2017
30
25
31
29
1
8
25
2017
8/25/2017
29
23
30
29
1
8
28
2017
8/28/2017
28
23
28
29
0
8
30
2017
8/30/2017
28
23
28
29
0
9
1
2017
9/1/2017
27
21
27
29
0
9
5
2017
9/5/2017
27
21
28
29
1
9
6
2017
9/6/2017
25
23
25
29
0
9
8
2017
9/8/2017
26
21
25
29
-1
9
11
2017
9/11/2017
23
21
22
29
-1
9
13
2017
9/13/2017
24
22
23
29
-1
9
15
2017
9/15/2017
25
24
25
29
0
9
18
2017
9/18/2017
26
22
27
29
1
9
20
2017
9/20/2017
26
25
27
29
1
9
22
2017
9/22/2017
27
24
27
29
0
9
25
2017
9/25/2017
27
23
27
29
0
9
27
2017
9/27/2017
27
23
28
29
1
9
29
2017
9/29/2017
26
24
26
29
0
10
4
2017
10/4/2017
25
21
25
29
0
10
11
2017
10/11/2017
27
24
27
29
0
10
18
2017
10/18/2017
24
19
24
29
0
10
24
2017
10/24/2017
21
21
21
29
0
11
2
2017
11 /2/2017
19.4
21
20
29
0.6
11
9
2017
11 /9/2017
19
23
19
29
0
11
16
2017
11 /16/2017
17
16
17
29
0
11
22
2017
11 /22/2017
16
18
16
29
0
11
29
2017
11 /29/2017
15
17
15
29
0
12
6
2017
12/6/2017
15
19
15
29
0
12
14
2017
12/14/2017
10.3
13
10.1
29
-0.2
12
18
2017
12/18/2017
10.8
16
10.7
29
-0.1
12
27
2017
12/27/2017
10.6
10.9
29
0.3
1
2
2018
1 /2/2018
7.9
12
7
29
-0.9
1
8
2018
1 /8/2018
5.9
14
7.1
29
1.2
1
19
2018
1 /19/2018
12.1
15
7
29
-5.1
1
22
2018
1 /22/2018
8.6
14
10.6
29
2
1
29
2018
1 /29/2018
10.8
16
9.9
29
-0.9
2
5
2018
2/5/2018
8.6
13
9.4
29
0.8
2
12
2018
2/12/2018
11.4
17
11
29
-0.4
Page 41 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00010 - Temperature,
Wafer Deg. CenMgrade
Month Day
Year
Date
Upstream Effluent Dnstream Standard
D-U dill
2
19
2018
2/19/2018
12.2
17
11.7
29
-0.5
2
26
2018
2/26/2018
15.6
20
14.8
29
-0.8
3
5
2018
3/5/2018
12
15
13.1
29
1.1
3
12
2018
3/12/2018
10
15
10
29
0
3
19
2018
3/19/2018
13.9
16
14.7
29
0.8
3
26
2018
3/26/2018
11.7
16
11.3
29
-0.4
4
2
2018
4/2/2018
15.2
18
15.1
29
-0.1
4
9
2018
4/9/2018
14.9
17
14.9
29
0
4
16
2018
4/16/2018
17.1
17
16.5
29
-0.6
4
23
2018
4/23/2018
16.5
19
16
29
-0.5
4
30
2018
4/30/2018
18.5
20
18.2
29
-0.3
5
7
2018
5/7/2018
19.9
22
19.7
29
-0.2
5
14
2018
5/14/2018
24.3
24
25
29
0.7
5
21
2018
5/21/2018
23.5
23
22.3
29
-1.2
5
29
2018
5/29/2018
24.7
25
24.9
29
0.2
6
4
2018
6/4/2018
25
26
24.5
29
-0.5
6
5
2018
6/5/2018
24.8
26
24.5
29
-0.3
6
7
2018
6/7/2018
24.4
26
24.9
29
0.5
6
11
2018
6/11 /2018
28.5
27
28.7
29
0.2
6
12
2018
6/12/2018
25.3
26
24.8
29
-0.5
6
14
2018
6/14/2018
26.4
27
28.7
29
2.3
6
18
2018
6/18/2018
27.6
28
29.8
29
2.2
6
19
2018
6/19/2018
28.3
28
28.4
29
0.1
6
21
2018
6/21 /2018
27.7
29
28.4
29
0.7
6
25
2018
6/25/2018
27.9
28
27.6
29
-0.3
6
26
2018
6/26/2018
27.8
28
27.2
29
-0.6
6
28
2018
6/28/2018
28.4
29
27.1
29
-1.3
7
2
2018
7/2/2018
28.3
29
27.8
29
-0.5
7
3
2018
7/3/2018
29.1
29
30.1
29
1
7
5
2018
7/5/2018
29.1
25
29.7
29
0.6
7
9
2018
7/9/2018
28.7
25
29.1
29
0.4
7
10
2018
7/10/2018
28.7
24
29.6
29
0.9
7
12
2018
7/12/2018
28.6
28
29.5
29
0.9
7
16
2018
7/16/2018
29.1
29
29.5
29
0.4
7
17
2018
7/17/2018
29.5
28
29.6
29
0.1
7
19
2018
7/19/2018
28.1
29
28.2
29
0.1
7
23
2018
7/23/2018
28.2
28
29.4
29
1.2
7
24
2018
7/24/2018
28.8
28
29.1
29
0.3
7
26
2018
7/26/2018
28.9
28
29.7
29
0.8
7
30
2018
7/30/2018
29.4
28
29.5
29
0.1
7
31
2018
7/31 /2018
28.8
28
28
29
-0.8
8
2
2018
8/2/2018
24.8
2L
28.5
29
• 3.7
8
6
2018
8/6/2018
29.5
29
29.1
29
-0.4
8
7
2018
8/7/2018
29.9
28
31.4
29
1.5
8
9
2018
8/9/2018
29.6
29
28.9
29
-0.7
8
13
2018
8/13/2018
30.7
29
31
29
0.3
8
14
2018
8/14/2018
30.4
28
29.7
29
-0.7
8
16
2018
8/16/2018
29.9
28
30.2
29
0.3
8
20
2018
8/20/2018
28.9
28
28.7
29
-0.2
8
21
2018
8/21 /2018
28.3
28
27.7
29
-0.6
8
23
2018
8/23/2018
27.1
28
27.4
29
0.3
8
27
2018
8/27/2018
28.3
26
29.5
29
1.2
8
28
2018
8/28/2018
29.7
27
31
29
1.3
Page 42 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
NCO021156
00010 - Temperature,
Water Deg. Centigrade
Month Day
Year
Date
Upstream Effluent
Dnstream Standard
8
30
2018
8/30/2018
28.5
29
29.3
29
9
4
2018
9/4/2018
29
27
29.8
29
9
6
2018
9/6/2018
29.1
28
29.7
29
9
7
2018
9/7/2018
29.6
28
30.2
29
9
10
2018
9/10/2018
29.3
28
28.4
29
9
11
2018
9/11 /2018
29.6
28
28.6
29
9
13
2018
9/13/2018
29.4
28
28
29
9
17
2018
9/17/2018
24
25
25.8
29
9
18
2018
9/18/2018
26.8
26
27.3
29
9
20
2018
9/20/2018
23.4
28
27.3
29
9
24
2018
9/24/2018
26.4
27
25.9
29
9
25
2018
9/25/2018
27.1
26
26.8
29
9
27
2018
9/27/2018
26.6
28
26.6
29
10
1
2018
10/1/2018
26.9
26
26.7
29
10
8
2018
10/8/2018
28.1
27
27.8
29
10
15
2018
10/15/2018
24.3
23
23.7
29
10
22
2018
10/22/2018
27.1
21
21.1
29
10
29
2018
10/29/2018
18.4
19
18.6
29
11
5
2018
11 /5/2018
18.1
19
18.1
29
11
12
2018
11/12/2018
16.1
17
15
29
11
19
2018
11 /19/2018
15.2
16
.15.6
29
11
26
2018
11 /26/2018
14.8
15
14.4
29
12
3
2018
12/3/2018
13.1
17
13.7
29
12
11
2018
12/11 /2018
9.5
14
10.5
29
12
17
2018
12/17/2018
10.2
15
11
29
12
27
2018
12/27/2018
9.3
16
10.4
29
12
31
2018
12/31 /2018
11.2
16
11.5
29
1
7
2019
1 /7/2019
11.3
14
10.9
29
1
14
2019
1 /14/2019
9.3
13
9.3
29
1
21
2019
1/21/2019
9
8.9
29
1
28
2019
1 /28/2019
8.9
15
10.1
29
D-U diff
0.8
0.8
0.6
0.6
-0.9
-1
-1.4
1.8
0.5
3.9
-0.5
-0.3
0
-0.2
-0.3
-0.6
-6
0.2
0
-1.1
0.4
-0.4
0.6
1
0.8
1.1
0.3
-0.4
0
-0.1
1.2
n
243
241
243
243
Mean
24.0
22.0
24.3
0.3
SD
7.0
4.6
7.2
1.0
Min
5.9
9.0
7.0
-6.0
Max
33.0
29.0
33.0
3.9
Number occurrences of D-U > 2.8 `C: L 3
Page 43 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Instream Monitoring
00094 - Conductivity
(umhos/cm)
Month Day
Year
Date
Upstream Dnstream
6
1
2016
6/1 /2016
64
62
6
3
2016
6/3/2016
65
62
6
6
2016
6/6/2016
67
65
6
8
2016
6/8/2016
66
61
6
10
2016
6/10/2016
62
62
6
13
2016
6/13/2016
65
60
6
15
2016
6/15/2016
65
63
6
17
2016
6/17/2016
63
63
6
20
2016
6/20/2016
65
68
6
22
2016
6/22/2016
63
66
6
23
2016
6/23/2016
64
63
6
27
2016
6/27/2016
64
60
6
29
2016
6/29/2016
60
64
7
1
2016
7/1 /2016
60
64
7
5
2016
7/5/2016
61
65
7
6
2016
7/6/2016
60
60
7
8
2016
7/8/2016
62
60
7
11
2016
7/11 /2016
60
61
7
14
2016
7/14/2016
63
64
7
15
2016
7/15/2016
63
61
7
18
2016
7/18/2016
59
64
7
20
2016
7/20/2016
63
62
7
22
2016
7/22/2016
63
63
7
25
2016
7/25/2016
64
62
7
27
2016
7/27/2016
61
62
7
29
2016
7/29/2016
60
61
8
1
2016
8/1 /2016
63
62
8
3
2016
8/3/2016
63
60
8
5
2016
8/5/2016
65
65
8
8
2016
8/8/2016
61
63
8
10
2016
8/10/2016
62
65
8
12
2016
8/12/2016
60
61
8
15
2016
8/15/2016
62
62
8
17
2016
8/17/2016
64
63
8
19
2016
8/19/2016
61
63
8
22
2016
8/22/2016
63
63
8
24
2016
8/24/2016
62
65
8
26
2016
8/26/2016
61
59
8
29
2016
8/29/2016
62
61
8
31
2016
8/31 /2016
62
62
9
2
2016
9/2/2016
61
63
9
6
2016
9/6/2016
59
61
9
7
2016
9/7/2016
62
60
9
9
2016
9/9/2016
63
62
9
12
2016
9/12/2016
62
58
9
14
2016
9/14/2016
63
61
9
16
2016
9/16/2016
62
60
9
19
2016
9/19/2016
63
61
9
21
2016
9/21/2016
62
61
9
23
2016
9/23/2016
61
60
9
27
2016
9/27/2016
58
60
9
28
2016
9/28/2016
61
71
9
30
2016
9/30/2016
60
68
NCO021156
Page 1 G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Instream Monitoring NCO021156
00094 - Conductivity
lumhos/cm�
Month Day
Year
Date
Upstream Dnstream
10
5
2016
10/5/2016
61
62
10
12
2016
10/12/2016
59
65
10
19
2016
10/19/2016
64
66
10
26
2016
10/26/2016
62
66
11
2
2016
11 /2/2016
63
68
11
10
2016
11 /10/2016
61
64
11
17
2016
11 /17/2016
66
66
11
23
2016
11 /23/2016
66
68
11
30
2016
11 /30/2016
70
80
12
7
2016
12/7/2016
63
71
12
14
2016
12/14/2016
63
68
12
21
2016
12/21 /2016
65
68
12
28
2016
12/28/2016
84
74
1
6
2017
1 /6/2017
62
68
1
11
2017
1/11/2017
68
88
1
18
2017
1 /18/2017
95
79
1
25
2017
1 /25/2017
64
80
2
1
2017
2/11/2017
66
75
2
8
2017
2/8/2017
68
71
2
17
2017
2/17/2017
64
68
2
22
2017
2/22/2017
73
76
3
1
2017
3/1 /2017
77
75
3
8
2017
3/8/2017
72
68
3
16
2017
3/16/2017
72
86
3
23
2017
3/23/2017
69
72
3
29
2017
3/29/2017
83
84
4
6
2017
4/6/2017
74
72
4
12
2017
4/12/2017
102
67
4
19
2017
4/19/2017
90
81
4
26
2017
4/26/2017
68
66
5
3
2017
5/3/2017
69
67
5
10
2017
5/10/2017
67
66.5
5
16
2017
5/16/2017
67
67
5
24
2017
5/24/2017
68
66
5
31
2017
5/31 /2017
65
64
6
6
2017
6/6/2017
67
64
6
7
2017
6/7/2017
66
65
6
9
2017
6/9/2017
66
66
6
12
2017
6/12/2017
66
62
6
14
2017
6/14/2017
65
60
6
16
2017
6/16/2017
70
70
6
19
2017
6/19/2017
67.2
63
6
20
2017
6/20/2017
70.9
59.9
6
22
2017
6/22/2017
60.9
62.1
6
26
2017
6/26/2017
70
63
6
28
2017
6/28/2017
71
62
6
30
2017
6/30/2017
68
68
7
3
2017
7/3/2017
64
70
7
5
2017
7/5/2017
62
63
7
7
2017
7/7/2017
67
64
7
10
2017
7/10/2017
62
59
7
11
2017
7/11 /2017
63
63
7
14
2017
7/14/2017
68
61
Page 2
G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Instream Monitoring NCO021156
00094 - Conductivitylumhoslcm)
Month Day
Year Date
Upstream Dnstream
7
17
2017
7/17/2017
66
68
7
19
2017
7/19/2017
67
64
7
21
2017
7/21 /2017
67
66
7
24
2017
7/24/2017
67
64
7
26
2017
7/26/2017
65
64
7
28
2017
7/28/2017
67
63
7
31
2017
7/31 /2017
65
67
8
2
2017
8/2/2017
66
65
8
4
2017
8/4/2017
68
67
8
7
2017
8/7/2017
66
64
8
9
2017
8/9/2017
65
68
8
11
2017
8/11 /2017
69
69
8
14
2017
8/14/2017
66
68
8
15
2017
8/15/2017
62
65
8
18
2017
8/18/2017
65
68
8
21
2017
8/21 /2017
68
66
8
23
2017
8/23/2017
70
67
8
25
2017
8/25/2017
68
65
8
28
2017
8/28/2017
67
64
8
30
2017
8/30/2017
66
66
9
1
2017
9/1 /2017
64
64
9
5
2017
9/5/2017
66
63
9
6
2017
9/6/2017
61
61
9
8
2017
9/8/2017
60
64
9
11
2017
9/11/2017
67
66
9
13
2017
9/13/2017
64
79
9
15
2017
9/15/2017
64
63
9
18
2017
9/18/2017
65
65
9
20
2017
9/20/2017
66
64
9
22
2017
9/22/2017
68
64
9
25
2017
9/25/2017
66
62
9
27
2017
9/27/2017
65
63
9
29
2017
9/29/2017
67
61
10
4
2017
10/4/2017
65
63
10
11
2017
10/11/2017
69
68
10
18
2017
10/18/2017
63
62
10
24
2017
10/24/2017
64
66
11
2
2017
11 /2/2017
60.6
60.4
11
9
2017
11 /9/2017
59
62
11
16
2017
11/16/2017
61
64
11
22
2017
11 /22/2017
63
62
11
29
2017
11 /29/2017
65
72
12
6
2017
12/6/2017
62
67
12 '
14
2017
12/14/2017
69.1
66.2
12
18
2017
12/18/2017
62.7
78.1
12
27
2017
12/27/2017
66.1
67.1
1
2
2018
1 /2/2018
66.2
64
1
8
2018
1 /8/2018
61.3
67.6
1
19
2018
1 /19/2018
62.5
63
1
22
2018
1 /22/2018
62.2
63.7
1
29
2018
1 /29/2018
92.1
96.5
2
5
2018
2/5/2018
63.3
77.8
2
12
2018
2/12/2018
74.6
67.5
Page 3
G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Instream Monitoring
NCO021156
00094 - Conductiv_ity
(umhosrcm)
Month Day
Year Date
Upstream Dnstream
2
19
2018
2/19/2018
73.2
62.5
2
26
2018
2/26/2018
108
68.4
3
5
2018
3/5/2018
65.9
64.8
3
12
2018
3/12/2018
73
60.9
3
19
2018
3/19/2018
102
68.3
3
26
2018
3/26/2018
60.7
63.9
4
2
2018
4/2/2018
86
62.2
4
9
2018
4/9/2018
55.2
58
4
16
2018
4/16/2018
93.4
64.7
4
23
2018
4/23/2018
52.9
54.6
4
30
2018
4/30/2018
61.1
61
5
7
2018
5/7/2018
55.8
57.2
5
14
2018
5/14/2018
89.6
53.3
5
21
2018
5/21 /2018
57
56.1
5
29
2018
5/29/2018
59.3
55.2
6
4
2018
6/4/2018
53.2
56.9
6
5
2018
6/5/2018
56.5
52.3
6
7
2018
6/7/2018
52.7
52.1
6
11
2018
6/11 /2018
52.9
54.1
6
12
2018
6/12/2018
60.9
50.4
6
14
2018
6/14/2018
51.8
51.9
6
18
2018
6/18/2018
53.9
51.3
6
19
2018
6/19/2018
57
51.6
6
21
2018
6/21 /2018
56.9
51
6
25
2018
6/25/2018
59
50.4
6
26
2018
6/26/2018
56.6
51
Upstream
6
28
2018
6/28/2018
56.4
52.8
outlier
7
2
2018
7/2/2018
50.9
13000
7
3
2018
7/3/2018
61.3
51.2
7
5
2018
7/5/2018
59.3
45.6
7
9
2018
7/9/2018
48.5
48.1
7
10
2018
7/10/2018
59.2
46.3
7
12
2018
7/12/2018
52.9
48.7
7
16
2018
7/16/2018
53.7
50.3
7
17
2018
7/17/2018
61.2
51.1
7
19
2018
7/19/2018
54.1
50.3
7
23
2018
7/23/2018
54.6
53.3
7
24
2018
7/24/2018
52
48.8
7
26
2018
7/26/2018
49.2
50.8
7
30
2018
7/30/2018
58.4
51.8
7
31
2018
7/31 /2018
57.7
52.9
8
2
2018
8/2/2018
53.1
55.7
8
6
2018
8/6/2018
49.6
50.6
8
7
2018
8/7/2018
54
56.7
8
9
2018
8/9/2018
51.5
50.4
8
13
2018
8/13/2018
48.9
50.6
8
14
2018
8/14/2018
50.2
50.8
8
16
2018
8/16/2018
49.2
51.4
8
20
2018
8/20/2018
43.6
44.5
8
21
2018
8/21 /2018
50.5
47.6
8
23
2018
8/23/2018
50.6
48.1
8
27
2018
8/27/2018
49.6
46.3
8
28
2018
8/28/2018
52
49.9
Page 4
G.B. Perlmutter, rev. 3/8/2019

Mount Holly WWTP
Instream Monitoring NCO021156
60094 - Conductivity
(umhos/cmt
Month Day
Year
Date
Upstream Dnstream
8
30
2018
8/30/2018
46.2
46.2
9
4
2018
9/4/2018
52
50.2
9
6
2018
9/6/2018
52.7
49.7
9
7
2018
9/7/2018
53.6
49.8
9
10
2018
9/10/2018
51.9
50
9
11
2018
9/11/2018
59.4
55.1
9
13
2018
9/13/2018
48.6
49.1
9
17
2018
9/17/2018
52
61.5
9
18
2018
9/18/2018
47.7
49.6
9
20
2018
9/20/2018
52.3
51.9
9
24
2018
9/24/2018
47.4
47.5
9
25
2018
9/25/2018
50.4
49.3
9
27
2018
9/27/2018
49.2
52.6
10
1
2018
10/1 /2018
46.5
47.6
10
8
2018
10/8/2018
46.7
45.7
10
15
2018
10/15/2018
46.1
47.8
10
22
2018
10/22/2018
50.6
48.4
10
29
2018
10/29/2018
46.7
49.8
11
5
2018
11 /5/2018
47.9
53.4
11
12
2018
11 /12/2018
46.4
47
11
19
2018
11 /19/2018
48.4
50.2
11
26
2018
11 /26/2018
49.9
48.8
12
3
2018
12/3/2018
51.5
54.9
12
11
2018
12/11 /2018
75.3
68
12
17
2018
12/17/2018
57.9
56.9
12
27
2018
12/27/2018
48
46.1
12
31
2018
12/31 /2018
66.8
48.3
1
7
2019
1 /7/2019
56.1
49.6
1
14
2019
1 /14/2019
48.6
48.5
1
21
2019
1 /21 /2019
47.6
47.1
1
28
2019
1/28/2019
57.2
55.2
n
165
165
Mean
66.1
65.8
SD
7.5
5.8
Min
58.0
58.0
Max
108.0
96.5
Page 5 G.B. Perlmutter, rev. 3/8/2019

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8

t 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 2 15 I 3 NCO021156 11 121 18/01/13 �17 18 LC 19 L G i 20) I
21I 1 1 1 1 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 1 I I 166
i inspection Work Days Facility Self -Monitoring Evaluation Rating B1 GA Reserved-
67 11.0 70 [Jj 71 1 72 N—I 731 74 751
I I I I I 80
Section El: FacilityData
Name and Location of Facility Inspected (For Industrial Users discharging (o POTW, also include Entry Time/Date Permit Effective Date
POTW name and NPDES permit Number) 10:35AM 18/01/13 11/08/01
Mount Holly WWTP
Exit Time/Date permit Expiration Date
165 Broome St
01:30PM 18/01/13 15/02/28
Mount Holly NC 28120
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Douglas Eugene Shoutd/ORCl704-827-42611
Name, Address of Responsible Orficiairritle/Phone and Fax Number
Contacted
David E Johnson,PO Box 406 Mt Holly NC 28120/1.1tility Director/704-951-0074/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenance Records/Reports
Self -Monitoring Program Sludge Handling Disposal Facility Site Review Effluent/Receiving Waters
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
Maria Schulte Division of Water Quality//704-663-16991
Ori A Tuvia MRO WQ//704-663-1699/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
W. Corey Basinger MRO WQ//704-235-2194/
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
31 NCO021156 �11 121 18/01/13 17 18 i „ i
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Page#

Permit: NCO021156
Inspection Date: 01/13/2018
Owner -Facility: Mount Holly WWTP
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?
❑
®1
❑
❑
Is access to the plant site restricted to the general public?
❑
❑
❑
Is the inspector granted access to all areas for inspection?
❑
❑
❑
Comment` The subject permit expired on 2/28/2015. The facility had sent a permit
renewal application.
Record Keeping
Yes No NA NE
Are records kept and maintained as required by the permit?
M
❑
❑
❑
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?
❑
❑
❑
Comment: For the most part the records reviewed during the inspection were organized and well
maintained. DMRs. COCs. bench sheets calibration to s and ORC logs,
were reviewed for
the period January 2017 through December 2017. During the records review it was
discovered the facility has conducted but not reported an annual pollutant scan on January
2017. Facility ORC will resubmit the EDMR for January 2017 to include this information.
Page# 3

Permit: NCO021156 Owner - Facility: Mount Holly WWTP
Inspection Date: 01/13/2018 Inspection Type: Compliance Evaluation
Influent Samplingg
Yes No NA NE
# Is composite sampling flow proportional?
❑
Cl
❑
Is sample collected above side streams?
❑
❑
❑
Is proper volume collected?
❑
❑
❑
Is the tubing clean?
0
❑
❑
❑
# 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 s_ubiect permit requires influent BOD and TSS composite samples. Regular sampler
aliquot verifications are performed and documented
Effluent Sampling
Yes No NA NE
Is composite sampling flow proportional?
■
❑
❑
❑
Is sample collected below all treatment units?
0
❑
❑
❑
Is proper volume collected?
❑
❑
❑
Is the tubing clean?
❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
❑
❑
❑
Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
❑
❑
❑
representative)?
Comment: The subiect ❑ermit requires composite and grab effluent samples. Weekly sami ler ali,.,uot
verifications are performed and documented
Upstream / Downstream Samplinci Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, and ■ ❑ 1111
sampling location)?
Comment:
Laboratory
Are field parameters performed by certified personnel or laboratory?
Are all other parameters(excluding field parameters) performed by a certified lab?
# Is the facility using a contract lab?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
Incubator (BOD) set to 20.0 degrees Celsius +1- 1.0 degrees?
Yes No NA NE
❑ ❑ ❑
❑ ❑ ■ ❑
Page# 4

Permit: NCO021156
Inspection Date: 01/13/2018
Laboratory
Owner - Facility: Mount Holly W WTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Comment: Influent and effluent analyses (including field parameters are performed under the City's
laboratory certification #215. Shealy Environmental Services, Inc. (LTMP, low level mercury,
metals nutrients] and ETS Labs (toxicity) have also been contracted to provide analytical
support.
The laboratory instrumentation used for field analyses appeared to be pronerly
calibrated/verified and documented.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? r ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable L ❑ ❑ ❑
Solids, pH, DO, Sludge'Judge, and other that are applicable?
Comment: The facility had a major failure to one of its three aeration basins. The basin will be out of
service permanently. At the time of the inspection, the facility_ appeared to be properly
operated and well maintained. The ORC and staff incorporate a comprehensive process
control program with all measurements being properly documented and maintained on -site.
Bar Screens
Type of bar screen
a.Manual
b.Mechanical
Yes No NA NE
Are the bars adequately screening debris?
0
❑
❑
❑
Is the screen free of excessive debris?
r
❑
❑
❑
Is disposal of screening in compliance?
❑
❑
❑
Is the unit in good condition?
❑
❑
❑
Comment: Two manual bar screens. One for the influent from the city of Mount Holly and the second for
the influent of A&E industry. Screenings are disposed at the County Landfill.
Equalization Basins
Yes No NA NE
Is the basin aerated?
❑ ❑
®
❑
Is the basin free of bypass lines or structures to the natural environment?
❑
❑
❑
Is the basin free of excessive grease?
❑
❑
❑
Are all pumps present?
❑
❑
❑
Are all pumps operable?
❑
❑
❑
Arelfloat controls operable?
❑
❑
❑
Are audible and visual alarms operable?
❑ ❑
❑
# Is basin size/volume adequate?
❑
❑
❑
Comment: Thee ualization basin is equipped with three operational pumps.
Page# 5

Permit: N00021156 Owner -Facility: Mount Holly WWTP
Inspection Date: 01/13/2018 Inspection Type: Compliance Evaluation
Aeration Basins Yes No NA NE
Mode of operation Ext. Air
Type of aeration system
Surface
Is the basin free of dead spots?
0
❑
❑
❑
Are surface aerators and mixers operational?
0
❑
❑
❑
Are the diffusers operational?
❑
❑
E
❑
Is the foam the proper color for the treatment process?
❑
❑
❑
Does the foam cover less than 25% of the basin's surface?
❑
❑
❑
Is the DO level acceptable?
❑
❑
❑
Is the DO level acceptable?(1.0 to 3.0 mg/1)
❑
❑
❑
Comment: The facility had a maior failure to one of its three aeration basins. The basin will be out
of
service Permanently. Aeration Basin calculations by Willis Engineers indicate
the facility will
be able to operate under it's normal load. 4 M_GD. Lime is
added on an as -needed basis to maintain appropriate alkalinit / H levels
Secondary Clarifier
Yes No NA NE
Is the clarifier free of black and odorous wastewater?
■
❑
❑
❑
Is the site free of excessive buildup of solids in center well of circular clarifier?
❑
❑
❑
Are weirs level?
❑
❑
❑
Is the site free of weir blockage?
❑
E
❑
❑
Is the site free of evidence of short-circuiting?
❑
■
❑
❑
Is scum removal adequate?
❑
❑
❑
Is the site free of excessive floating sludge?
❑
❑
❑
Is the drive unit operational?
❑
❑
❑
Is the return rate acceptable (low turbulence)?
❑
❑
❑
Is the overflow clear of excessive solids/pin floc?
❑
❑
❑
Is the sludge blanket level acceptable? (Approximately '/. of the sidewall depth)
0
❑
❑
❑
Comment: Both secondary clarifiers were operational and in service. Both clarifiers reauired
maintenance. At the time of the inspection the clarifier weir had excessive al ae
rowth and
small conecting sections were missing allowing for less than optimal clarfier o eration/
Pumps-RAS-WAS
Yes
No NA NE
Are pumps in place?
!
❑
❑
❑
Are pumps operational?
❑
❑
❑
Are there adequate spare parts and supplies on site?
❑
❑
❑
N
Comment:
Page# 6

Permit: NCO021156 Owner - Facility: Mount Holly WWTP
Inspection Date: 01/13/2018 Inspection Type: Compliance Evaluation
Pumas-RAS-WAS
Yes
No NA NE
Disinfection -Gas
Yes
No NA NE
Are cylinders secured adequately?
W
❑
❑
❑
Are cylinders protected from direct sunlight?
❑
❑
Is there adequate reserve supply of disinfectant?
❑
❑
❑
Is the level of chlorine residual acceptable?
®
❑
❑
❑
Is the contact chamber free of growth, or sludge buildup?
❑
❑
❑
Is there chlorine residual prior to de -chlorination?
❑
❑
❑
Does the Stationary Source have more than 2500 lbs of Chlorine (CAS No. 7782-50-5)?
W
❑
❑
❑
If yes, then is there a Risk Management Plan on site?
K
❑
❑
❑
If yes, then what is the EPA twelve digit ID Number? (1000- - )
1000-0016-6562
If yes, then when was the RMP last updated?
Comment:
De -chlorination
Yes No NA.NE
Type of system ?
Gas
Is the feed ratio proportional to chlorine amount (1 to 1)?
❑
❑
❑
Is storage appropriate for cylinders?
�ti
❑
❑
❑
# Is de -chlorination substance stored away from chlorine containers?
❑
❑
❑
Comment:
Are the tablets the proper size and type? ❑ ❑ W ❑
Are tablet de -chlorinators operational? ❑ ❑ ❑
Number of tubes in use?
Comment:
Flow Measurement - Effluent
Yes No NA NE
# 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?
❑
❑
Wj,
❑
Comment: The flow meter is calibrated annually and was last calibrated on 8/15/2017 by
ClearWater.
Inc.
Page# 7

Permit: NCO021156 Owner - Facility: Mount Holly WWTP
Inspection Date: 01/13/2018 Inspection Type: Compliance Evaluation
Effluent Pip
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?
E
❑
❑
❑
If effluent (diffuser pipes are required) are they operating properly?
❑
❑
0
❑
Comment: The effluent ameared clear with trace suspended solids and no foam. The receiving stream
did not appear to be negatively impacted by solids.
Aerobic Digester
Yes
No NA NE
Is the capacity adequate?
■
❑
❑
❑
Is the mixing adequate?
N
Q
❑
❑
Is the site free of excessive foaming in the tank?
❑
❑
❑
# Is the odor acceptable?
❑
❑
❑
# Is tankage available for properly waste sludge?
❑
❑
❑
Comment: Waste activated sludge is pumped into two (2) 750,000 gallon holding tanks eguipned for
storage and aeration. Bio-solids are land applied by a contracted company S na ro under
the authori of Permit No. W00001863.
Page# 8

NH3/TRC WLA Calculations
Mount 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)
Daily Maximum Limit (ug/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/I)
IWC (%)
Allowable Cone. (ug/1)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
95
s7Q10(CFS)
95
4
DESIGN FLOW (MGD)
4
6.2
DESIGN FLOW (CFS)
6.2
17.0
STREAM STD (MG/L)
1.0
0
Upstream Bkgd (mg/1)
0.22
6.13
IWC (%)
6.13
277
Allowable Cone. (mg/1)
13.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
w7Q10(CFS)
95
200/10om1
DESIGN FLOW (MGD)
4
DESIGN FLOW (CFS)
6.2
STREAM STD (MG/L)
1.8
16.32
Upstream Bkgd (mg/1)
0.22
IWC (%)
6.13
Allowable Cone. (mg/1)
26.0
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia tas NH3-N]
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
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)

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REASONABLE POTENTIAL ANALYSIS
H1
U-, r 'PASTE SF U;IAL
JH2
; use ••PASTE- yr•r ClAI
Effluent Hardness
4081" `! ` Iftc . L'' `
Upstream Hardness
Alut '"` ` cr.=f
rAando i panes
µ
M;>+nm,a. a,:{.: { :•v.n.
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
1
3/13/2617
37
37
Std Dev.
2.6077
1
3/13/2017
18
18
Std Dev.
_
0.8944
2
3/14/2017
35
35
Mean
33.4000
2
3/14/2017
16
16
Mean
17.6000
3
3115/2017
31
31
C.V. (default)
0.6000
3
3/15/2017
18
18
C.V. (default)
0.6000
4
3/16/2017
33
33
n
5
4
3/16/2017
18
18
n
5
5
3/17/2017
31
31
10th Per value
31.00 mg/L
5
3/17/2017
18
18
1Oth Per value 16.80 mg/L
6
Average Value
33.40 mg/L
6
Average Value 17.60 mg/L
7
Max. Value
37.00 mg/L
7
Max. Value
18.00 mg/L
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
NCO021156 RPA_2018, data
1 3/11/2019

REASONABLE POTENTIAL ANALYSIS
& Par02
Date Data
1 11/10/2016 <
2 2/9/2017 <
3 5/4/2017 <
4 8/10/2017 <
5 11/912017 <
6 2/8/2018 <
7 6/10/2018 <
8 8/9/2018 <
9 11/8/2018 <
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
Um -PASTE VILCIA
Arsenic
Yahr'" nrn'Cp r
litoxim�m naia pelnr
.58
BDL=112DL
Results
1 0.5
Std Dev.
0.220;
1 0.6
Mean
0.8889
2 1
C.V. (default)
0.6000
2 1
n
9
2 1
2 1
Mult Factor =
1.81
2 1
Max. Value
1.0 ug/L
2 1
Max. Pred Cw
1.8 ug/L
2 1
Beryllium
Date Data
BDL=112DL
Results
1 7/23/2014 <
0.4 0.2
Std Dev.
2 7/24/2015 <
0.4 0.2
Mean
3 10/13/2016 <
0.4 0.2
C.V. (default)
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Vot'PASTE SPFCW
Vwhns"own -COPY'.
Maximom dam "all
=W
0.2000
0.6000
3
3.00
0.20 ug/L
0.60 ug/L
-2-
NC0021156 RPA_2018, data
3/11 /2019

REASONABLE POTENTIAL ANALYSIS
Par04
us.e "Pr SSE 5PE%Iki
Cadmium ;Palms"tMn"coow
tAs,.ia. ar, airs point:
e W
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
Date
Data
BDL=1/2DL
Results E
11/10/2016
<
0.1
0.05
Std Dev.
0.0882
2/9/2017
<
0.1
0.05
Mean
0.2056
514/2017
<
0.5
0.25
C.V. (default)
0.6000
8/10/2017
<
0.6
0.25
n
9
11/9/2017
<
0.5
0.25
218/2018
<
0.5
0.25
Mult Factor =
1.81
5/10/2018
<
0.5
0.25
Max. Value
0.250 ug/L
8/9/2018
<
0.5
0.25
Max. Pred Cw
0.453 ug/L
11/8/2018
<
0.5
0.25
NCO021156 RPA_2018, data
- 3 - 3/11/2019

REASONABLE POTENTIAL ANALYSIS
Par07
Total Phenolic Compounds
Date
Data
BDL=1/2DL
Results
1
11/10/2016
35
35
SW Dev.
2
2/9/2017
<
10
5
Mean
3
5/4/2017
<
10
5
C.V. (default)
4
8/10/2017
<
10
5
n
5
11/9/2017
<
10
5
6
2/8/2018
10
10
Mult Factor =
7
5/1012018
1.4
1.4
Max. Value
8
8/9/2018
<
10
5
Max. Pred Cw
9
11/8/2018
<
10
5
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
tia� "PA9i£ SPEGU
Par"L
Vice'PAS 7E SPEC41
°''L"s- th "C*Pr
Chromium III
Wkwe u""
Mavmum dat7 points
M"rMa- W la PO4M
Date
Data BDL=1/20L Results
10.1760
1
Std Dev.
NO DATA
8.4889
2
Mean
NO DATA
0.6000
3
C.V.
NO DATA
9
4
n
0
5
1.81
6
Mult Factor =
N/A
35.0 ug/L
7
Max. Value
N/A Ng/L
63.4 ug/L
8
Max. Pred Cw
N/A yg/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
NCO021156 RPA_2018, data
-4- 3/11 /2019

REASONABLE POTENTIAL ANALYSIS
Par09
Par10
W "PASTE SPECAL
11-I ^ PAS TE S1't
Chromium VI
•Values,#wn"COPY" .
Chromium, Total
MaWts"thtn CAFI'C'1AL
Mow��t ®
M,: n : cua , , n,
• fA
.
Date
Data BDL=1/20L Results
Date Data
BDL=112DL
Results
1
Std Dev.
NO DATA
1
11/10/2016
11
11
Std Dev.
6.4733
2
Mean
NO DATA
2
2/9/2017
11
11
Mean
11.3889
3
C.V.
NO DATA
3
5/4/2017
7.7
7.7
C.V.(defauR)
0.6000
4
n
0
4
8/10/2017 <
5
2.5
n
9
5
5
11/9/2017
17
17
6
Mult Factor =
N/A
6
2/8/2018
25
25
Mult Factor =
1.81
7
Max. Value
N/A Ng/L
7
5/10/2018
12
12
Max. Value
25.0 Ng/L
8
Max. Pred Cw
N/A Ng/L
8
8/9/2018
9.6
9.6
Max. Pred Cw
45.3 Ng/L
9
9
11/8/2018
6.7
6.7
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
I 58
NCO021156 RPA_2018, data
-5- 3/11/2019

REASONABLE POTENTIAL ANALYSIS
Copper
Date Data
BDL=112DL
Results
1
2/5/2015
21
21
Std Dev.
2
5/7/2015
24
24
Mean
3
8/6/2015
29
29
C.V.
4
11/5/2015
21
21
n
5
2/4/2016
18
18
6
5/5/2016
43
43
Mult Factor =
7
8/4/2016
31
31
Max. Value
8
11/10/2016
29
29
Max. Pred Cw
9
2/9/2017
28
28
10
5/4/2017
24
24
11
8/10/2017
19
19
12
11 /9/2017
24
24
13
2/8/2018
26
26
14
5/10/2018
16
16
15
8/9/2018
27
27
16
11/812018
18
18
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
Lfse -PASTE SPECIAL Par12 Use "PASTE 5PEClh
v.lu.. WAOr capv~ Cyanide WNW then 'COPY'
NaAnnrrwm data V*tnts _ mj"%mum dat! pWnt
a 5! .54
24.8750
0.2658
16
1.20
43.00 ug/L
51.60 ug/L
Date
Data
BDL=1/2DL
Results
1
11/10/2016
<
10
5
Std Dev.
2
219/2017
<
10
5
Mean
3
5/4/2017
10
10
C.V. (default)
4
8/10/2017
<
10
5
n
5
11/9/2017
<
10
5
6
2/8/2018
<
10
5
Mull Factor =
7
5/10/2018
<
10
5
Max. Value
8
8/9/2018
<
10
5
Max. Pred Cw
9
11/8/2018
<
10
5
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
5.56
0.6000
9
1.81
10.0 ug/L
18.1 ug/L
-6-
NC0021156 RPA_2018, data
3/11/2019

REASONABLE POTENTIAL ANALYSIS
Par14
J Use "PPSTf SPE CIAL
Par16
sr'c.c+A
Lead
Vsoes'Mr o' COF/
Molybdenum
"M"OPY'
i
Manmunrtpau:�
eo»mS
Date
BDL=I/2DL
Results
Date
Data
BDL=1f2DL
Results
1
11110/2016
<
1
0.5
Std Dev.
0.0000
1
2/5/2015
<
10
5
Std Dev.
0.0000
2
2/9/2017
<
1
0.5
-Mean
0.5000
2
5/7/2015
<
10
5
Mean
5.0000
3
5/4/2017
<
1
0.5
C.V. (default)
0.6000
3
11/10/2016
<
10
5
C.V.
0.0000
4
8/10/2017
<
1
0.5
n
9
4
2/9/2017
<
10
5
n
11
5
11/912017
<
1
0.5
5
5/4/2017
<
10
5
6
2/8/2018
<
1
0.5
Mult Factor =
1.81
6
8/10/2017
<
10
5
Mull Factor =
1.00
7
5/10/2018
<
1
0.5
Max. Value
0.500 ug/L
7
11/9/2017
<
10
5
Max. Value
5.0 ug/L
8
8/9/2018
<
1
0.5
Max. Pred Cw
0.905 ug/L
8
2/8/2018
<
10
5
Max. Pred Cw
5.0 ug/L
9
11/8/2018
<
1
0.5
9
5/10/2018
<
10
5
10
10
8/9/2018
<
10
5
11
11
11/8/2018
<
10
5
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
NCO021156 RPA_2018, data
-7- 3111 /2019

REASONABLE POTENTIAL ANALYSIS
& Par18
Date Data
1 11/10/2016 <
2 2/9/2017 <
3 5/4/2017 <
4 8/10/2017 <
5 11/9/2017 <
6 2/8/2018 <
7 5/10/2018 <
8 8/9/2018 <
9 11/8/2018 <
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
Nickel
BDL=112DL
Results
5 2.5
Std Dev.
5 2.5
Mean
5 2.5
C.V. (default)
5 2.5
n
5 2.5
5 2.5
Mult Factor =
5 2.5
Max. Value
5 2.5
Max. Pred Cw
5 2.5
1j" "PASTE SAEC1A(
Vahws- tMn -COPY" .
vgx-," 0AM PDrnts
= SE
2.5000
0.6000
9
1.81
2.5 yg/L
4.5 Ng/L
Date Data
1 11/10/2016 <
2 219/2017 <
3 5/4/2017 <
4 8/10/2017 <
5 11/9/2017 <
6 2/8/2018 <
7 5/10/2018 <
8 8/9/2018 <
9 11/8/2018 <
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
Selenium
BDL=1/2DL
Results
1 0.5
Std Dev.
1 0.5
Mean
5 2.5
C.V. (default)
5 2.5
n
5 2.5
5 2.5
Mull Factor =
5 2.5
Max. Value
2 1
Max. Pred Cw
5 2.5
USE -PASTE SPEcfA
VeN*61 thRqCOP'Y-
WA&rmum d" pprpt
=y
1.8889
0.6000
9
1.81
2.5 ug/L
4.5 ug/L
-8-
N00021156 RPA_2018, data
3/11/2019

REASONABLE POTENTIAL ANALYSIS
Par10
Date
Data
1
2/5/2115
<
2
5/7/2015
<
3
8/6/2015
<
4
11/5/2015
<
5
2/4/2016
<
6
5/5/2016
<
7
8/4/2016
<
8
11/10/2016
<
9
2/9/2017
<
10
5/4/2017
<
11
8/10/2017
<
12
11/9/2017
<
13
2/8/2018
<
14
5/10/2018
<
15
8/9/2018
<
16
11/8/2018
<
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
Silver
BDL=112DL
Results
1 0.5
Std Dev.
1 0.5
Mean
1 0.5
C.V.
1 0.5
n
1 0.5
1 0.5
Mult Factor =
1 0.5
Max. Value
1 0.5
Max. Fred Cw
1 0.5
1 0.5
1 0.5
1 0.5
1 0.5
1 0.5
1 0.5
1 0.5
Use"PA.STC SPECIAL
Valu"" Man "COPY" -
�+dxirTliaal.l watt, pmota
.55
0.5000
0.0000
16
1.00
0.500 ug/L
0.500 ug/L
Zinc
Date
Data
BDL=1/2DL
Results
1
11/10/2016
62
62
Std Dev.
2
2/9/2017
62
62
Mean
3
5/4/2017
59
59
C.V.(default)
4
8/10/2017
44
44
n
5
11 /9/2017
54
54
6
2/8/2018
130
130
Mult Factor =
7
5/10/2018
57
57
Max. Value
8
8/9/2018
43
43
Max. Fred Cw
9
11/8/2018
56
56
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
J.-t-" 4%1E SPEC,.aL
1 alues" em "COPY' .
mwafnm data o-Slam
` • 5s
63.0000
0.6000
9
1.81
130.0 ug/L
235.3 ug/L
-9-
NCO021156 RPA_2018, data
3/1112019

REASONABLE POTENTIAL ANALYSIS
Par22
Liar "PASTE SPEC IA
Par23
Uw-F•AStF SPECIAL
Antimony
1j ke","' `" "Co",
Bromoform
M*X1 Thum (th%M point&
dip Ms;,mum Painm
.60
= 5!
Date Data
BDL=112DL
Results
Date Data
BDL=112DL
Results
1
2/512015
32
32
Std Dev.
_
1
7/23/2014
6.1 5.1
Std Dev.
12.042G
2
577/2015
38
38
Mean
26.6875
2
7/24/2016
25 25
Mean
11.1333
3
8/6/2015
33
33
C.V.
0.2810
3
10/13/2016
3.3 3.3
C.V. (default)
0.6000
4
11/5/2015
31
31
n
16
4
n
3
5
2/4/2016
32
32
5
6
515/2016
28
28
Mutt Factor =
1.21
6
Mutt Factor =
3.00
7
8/4/2016
27
27
Max. Value
38.000000 Ng/L
7
Max. Value
25.000000 Ng/L
8
11/10/2016
27
27
Max. Fred Cw
45.980000 Ng/L
8
Max. Prod Cw
75.000000 Ng/L
9
2/9/2017
26
26
9
10
5/4/2017
30
30
10
11
8/10/2017
28
28
11
12
11/92017
21
21
12
13
2/8/2018
18
18
13
14
5/102018
3
5
14
15
8/9/2018
27
27
15
16
11/82018
24
24
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
I 58
NC0021156 RPA_2018, data
-10- 311112019

REASONABLE POTENTIAL ANALYSIS
Par24
Iuaa
Pa125
"PAS'n s Cs
usv "PASTE S.P .1Al
Bromodichloromethane
Valves` Men
Dibromochloromethane
VON" Men+'Cop
M&6�,Um oa a v9
m6mmurm Cos rcinta
-58
•�s
Date
Data
BDL=112DL
Results
Date
Data BDL=1/2DL
Results
1
2/5/2015
2.7
2.7
Std Dev.
2.6873
1
7/23/2014
10 10
Std Dev.
6.3311
2
5/7/2015
6.1
6.1
Mean
4.3188
2
7/24/2015
18 18
Mean
11.1667
3
8/6/2015
5.1
5.1
C.V.
0.6222
3
10/13/2016
5.5 5.5
C.V. (default)
0.6000
4
11/5/2015
5.1
5.1
n
16
4
n
3
5
2/4/2016
2.6
2.6
5
6
5/5/2016
4.4
4.4
Mult Factor =
1.49
6
Mult Factor =
3.00
7
8/4/2016
1.8
1.8
Max. Value
11.000000 Ng/L
7
Max. Value
18.000000 Ng/L
8
11/10/2016
2.7
2.7
Max. Pred Cw
16.390000 Ng/L
8
Max. Pred Cw
54000000 Ng/L
9
2/9/2017
1.9
1.9
9
10
5/4/2017
4.3
4.3
10
11
8/10/2017
6.3
6.3
11
12
11/9/2017
4.1
4.1
12
13
2/8/2018
< 1
0.5
13
14
5/10/2018
2.2
2.2
14
15
8/9/2018
11
11
15
16
11/8/2018
8.3
8.3
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
NC0021156 RPA_2018, data
11
-
3/11/2019

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Permit No. NCO021156
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
BeEyllium
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/l for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151 [In hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[In hardness](0.041838)) • e^{0.9151[ln hardness]-3.6236}
Cadmium, Chronic
WER*{1.101672-[In hardness](0.041838)) • e^{0.7998[ln hardness]-4.445l}
WER*0.316 eN0.8190[ln hardness]+3.7256}
Chromium III, Acute
Chromium III, Chronic
WER*0.860 a^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 a^{0.9422[ln hardness]-1.700)
Copper, Chronic
WER*0.960 a^(0.8545[In hardness]-1.702)
Lead, Acute
WER*{1.46203-[In hardness](0.145712)} • e^11.273[In hardness]-1.460)
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)) • e^{1.273[In hardness]-4.705}
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255)
Nickel, Chronic
WER*0.997 a^{0.8460[In hardness]+0.0584}
Page 1 of 4

Permit No. NCO021156
Silver, Acute WER*0.85 • e^{1.72[ln hardness]-6.59)
Silver, Chronic Not applicable
Zinc, Acute WER*0.978 a^{0.8473[in 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/WQBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 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. NC0021156
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= Permitted Flow, cfs *Avg. Effluent Hardness m L + (s7Q 10 cfs *Avp,. Upstream Hardness mg/L
(Permitted Flow, cfs + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator. Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA $23-B-96-007, June 1996) and the
equation:
Cdiss = 1
Ctotal 1 + { [Kp.] [ssIl+al] [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) — (s7010) (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)
j
33.4 Average of 5 samples
(Total as CaCO3)
y
Average Upstream Hardness (mg/L)
17.6
Average of 5 samples
(Total as CaCO3)
7Q10 summer (cfs)
95
Adjusted control release from
Mountain Island Lake
1Q10 (cfs)
320
Calculated by RPA spreadsheet
Permitted Flow (MGD)
4.0
Permit renewal application
Permit Writer: l' � ttj �� �� J� Date: t b t 4' t
Page 4 of 4

CITY OF MOUNT HOLLY WASTEWATER TREATMENT PLANT
MERCURY MINIMIZATION PLAN
Date Developed Reviewed by Approved by
July 2015
Date/Description I Reviewed bv: I ADoroved
SECTION 1- PURPOSE
The purpose of this Mercury Minimization Plan ("MMP") is to describe best management practices
through which the Mount Holly Wastewater Treatment Plant will seek to reduce the amount of mercury
discharged into its system and, ultimately, to the environment. The MMP compiles mercury reduction -
related efforts to -date and potential future action items. It is designed to be a working document to
help guide the City of Mount Holly in its efforts to control mercury loadings discharged into its Publicly -
Owned Treatment Works (POTW) by users of the sewer system. Such a reduction in loadings to the
sewer system should translate to a reduction in the amount of mercury which is discharged from the
treatment plant. The management practices summarized below may also help control some of the
mercury reaching our storm sewer system as well.
SECTION II — FACILITY DESCRIPTION
The City of Mount Holly operates a publicly owned treatment works (POTW), including a collection
system and wastewater treatment plant (WWTP), that serves the City of Mount Holly and Town of
Stanley.
The Mount Holly Wastewater Treatment Plant is a 4.0 MGD designed conventional activated sludge
treatment facility. The treatment process includes a mechanical bar screen, grit removal, activated
sludge treatment with mechanical aerators, secondary clarification, chlorination and dechlorination.
Excess biological sludge is digested and land applied to approved land application sites.
Most municipal treatment plants are not designed to remove mercury and it is exceedingly expensive to
do so to very low levels. Tangential mercury removal occurs through typical municipal treatment with
trace levels of mercury (and other metals) ending up in solids removed from the raw wastewater.
Mercury is not used in the treatment processes at the WWTP. Mercury may be introduced into the
sewer system through a variety of sources, such as from industrial users, laboratories, and other
businesses. Residual deposits of mercury are also possible in the sewer system from historic practices.
Finally, trace amounts from household products and atmospheric deposition (both wet and dry)
contribute to sewer system mercury loadings.

SECTION III — PROGRAM PLAN
A. EVALUATION OF POTENTIAL NON -DOMESTIC SOURCES CONTRIBUTING MERCURY TO THE
POTW
Within 180 days from February 1, 2015 (the NPDES Permit required development date of the MMP), the
Mount Holly Wastewater Treatment Plant will evaluate available information to assess the potential for
non -domestic users of the sewer system to contribute mercury to the system. The information to be
reviewed may include: (1) POTW influent and effluent mercury data and trends; (2) industrial user
permits and associated mercury monitoring data; (3) Toxics Release Inventory (TRI); (4) state hazardous
site registry and the National Priority List relating to mercury contamination; and (5) historical records of
industrial sites which have contributed mercury loadings to the sewer system.
The Mount Holly Wastewater Treatment Plant will also survey and evaluate the following common
sources of mercury in its service area: (1) dentist offices; (2) hospitals; (3) laboratories; (4) auto
recyclers; and (5) other potential sources of mercury based on existing information.
The Mount Holly Wastewater Treatment Plant will request that industrial users review mercury
concentrations in high -volume process chemicals and demonstrate that the mercury concentrations are
below industry average. The Mount Holly Wastewater Treatment Plant will request that alternative
sources for chemicals be explored if the mercury levels are determined to be significantly higher than
would normally be expected.
The evaluation of potential non -domestic sources of mercury to the sewer system will be updated every
five years, as warranted by prior sampling results and any additional new potentially significant sources
to the system.
B. ADDITIONAL CONTROL MEASURES
This MMP identifies reasonable and cost-effective control measures to minimize mercury being
discharged into the POTW. Below is a listing of initial BMPs for this POTW.
Pollution Prevention
Substances used at the WWTP will be evaluated to determine if they contain mercury or mercury -based
compounds. Any such chemicals will be evaluated for substitution with non -mercury -containing
substances. All chemicals used and/or stored in bulk quantity will be required to be supplied with a
Certificate of Analysis (COA).
The City will review information on existing industrial users. Categorical industrial user data will be
examined to determine if mercury is a pollutant of concern for that industrial category. A determination
will be made on non -categorical users to determine if processes, materials or products stored or
handled on -site have the potential to discharge mercury into the treatment system.

Housing,_ Spill Control and Collection, and Education
The Mount Holly Wastewater Treatment Plant will develop procedures to minimize the possibility of any
spill or release at the WWTP involving mercury containing substances. The Mount Holly Wastewater
Treatment Plant will add mercury identification and proper disposal to ongoing and future operator
training procedures.
Surveys and other tools will be developed for use in contact with Medical Facilities, Dental Clinics,
Schools, General Industrial Users, Facility/Treatment Systems, Plumbers and the General Public to
determine their risk profile, assist in developing appropriate control procedures, identifying
performance measure and establishing achievable goals for mercury minimization.
Public Outreach
The Mount Holly Wastewater Treatment Plant will make available educational information regarding
sources of household mercury and appropriate use/disposal practices. This information may be posted
on the City of Mount Holly's website. The availability of this information will be made available as an
outreach to Mount Holly Wastewater Treatment Plant's customers. The Mount Holly Wastewater
Treatment Plant will also facilitate public awareness regarding community collection points for mercury -
containing products from residents/customers for proper disposal. Periodic reminders of such collection
programs will be provided as part of the Mount -Holly Wastewater Treatment Plant's ongoing public
outreach. The City will incorporate additional outreach programs such as identifying mercury recyclers,
issuing news releases and placing information on Utility mail outs regarding the control of mercury.
Laboratory Practice
The Mount Holly Wastewater Treatment Plant operates a laboratory for purposes of complying with
state and federal monitoring and sampling requirements. The laboratory is a potential source of small
quantities of mercury -containing compounds. Laboratory employees will be trained in the proper
handling and disposal of these materials. The laboratories have also replaced mercury thermometers
with non -mercury thermometers, whenever practical.
An Standard Operating Procedure for handling of mercury containing devices and
C. TRACKING AND MONITORING
In order to assess the implerentation of the control measures, the Mount Holly Wastewater Treatment
Plant proposes to undertake the following evaluations beginning after the first full year that this MMP is
implemented:
1. Survey annually at least ten percent (10%) of any non -domestic users identified as
possible significant sources of mercury to the POTW;
2. Track the implementation of the programs outlined above;
3. Monitor Significant Industrial User discharge at least annually;
4. Monitor influent mercury at least annually. Require significant non -domestic sources of
mercury to monitor periodically, as warranted; and
5. Measure effluent mercury as required by the NPDES permit.

These efforts will allow the Mount Holly Wastewater Treatment Plant to establish a baseline of influent
and effluent mercury levels to assist in identifying any trends in mercury contributions from domestic
and non -domestic users of the sewer system. This baseline will be tracked annually.
SECTION 1V-- IMPLEMENTATION OF CONTROL MEASURES
The Mount Holly Wastewater Treatment Plant will implement the control measures summarized in
Section 3 over the permit term and will update this MMP as warranted.
SECTION V — REPORTING
A summary of the MMP activities will be submitted as part of the NPDES permit renewal process.

19
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File: NCO089630 Charlotte - Long Creek
NCO021156 Mount Holly
NUTRIENT ALLOCATION TRANSFER AGREEMENT
BETWEEN CITY OF CHAROTTE AND CITY OF MOUNT HOLLY
This NUTRIENT ALLOCATION TRANSFER A GREEMENT (the "Agreement") is
made and entered into and deemed effective as of the 5 day of 2018, by
and between the City of Charlotte (referred to herein as "Charlotte") and t e City of Mount Holly
(referred to herein as '% t. Holly"), each a "Party" or collectively the "Parties", and each a duly
incorporated municipality under the laws of the State of North Carolina.
BACKGROUND AND PURPOSE
WHEREAS, Charlotte, acting through Charlotte Water, owns and operates the Long
Creek Pump Station ("LCPS") in Mecklenburg County, North Carolina as part of its public water
and sewer enterprise (collectively the "Charlotte System") that discharges into the Catawba
River and desires to design and construct a new regional wastewater treatment facility near the
confluence of Long Creek and the Catawba River (the "Long Creek WWTP" or "Regional
Plant") and make other renovations and improvements to the Charlotte System to provide
wastewater treatment capacity for multiple jurisdictions in western Mecklenburg County and
water quality protection for Lake Wylie (the "Charlotte Project").
WHEREAS, Mt. Holly owns ` and operates a wastewater treatment plant (the MT.
HOLLY WWTP") in Gaston County, North Carolina (collectively the "Mt. Holly Collection.
System") that discharges into the Catawba River and desires to connect its Collection System to
the Charlotte System in order to avoid some of the expenses associated with needed renovations,
expansion and/or replacement to remain in compliance with their NPDES permit issued by the
North Carolina Department of Environmental Quality ("DEQ");
WHEREAS, the Parties are subject to the Lake Wylie Nutrient TMDL (the "TMDL"), a
nutrient management plan approved by EPA Region 4 in 1996 that established the maximum
allowable loads of Total Nitrogen (TN) and - Total. Phosphorus (TP) that could be discharged
under their NPDES permits, set individual wasteload allocations (WLAs), and identified a
strategy for new and expanded discharges to the Catawba River;
WHEREAS, Charlotte needs additional nutrient allocations in order for the Regional
Plant to be issued a NPDES permit by DEQ that will satisfy the TMDL, and Mt. Holly needs
additional nutrient allocations to continue operation of its MT HOLLY WWTP in order to satisfy
the TMDL until conveyance facilities are constructed and its System is connected to the
Charlotte System thereto;

WHEREAS, pursuant to the terms of a Purchase and Sale Agreement dated on or about
May 13, 2013, CHAROTTE purchased approximately 180 acres of real property in Mecklenburg
County from Clariant Corporation, together with 90% of the permitted Nitrogen and
Phosphorous allocations in Clariant's NPDES permit (the "Clariant Nutrient Allocation"), and
Charlotte is willing to transfer a portion of the Clariant Nutrient Allocation to Mt. Holly until the
connection of the MT. HOLLY Collection System to the Charlotte System is made;
WHEREAS, pursuant to a Memorandum of Agreement between Charlotte and Mt. Holly
dated January 14, 2013, (the "Mt. Holly MOA"), a copy of which is attached hereto as Exhibit A,
the Parties agreed it is in their mutual interest to participate in a regional wastewater treatment
program and established the general terms and conditions under which they would cooperate and
coordinate their efforts, including provisions for an interim transfer of a portion of the Clariant
Nutrient Allocation by Charlotte to Mt. Holly while the Regional Plant is constructed and a
permanent transfer of the Clariant Nutrient Allocation back -to Charotte by Mt. Holly after
completion when the Mt. Holly Collection System has been connected thereto;
WHEREAS, the Parties wish to confirm and memorialize the nutrient allocation
transfers as set forth herein so the DEQ will approve the nutrient allocation limits and issue a
NPDES permit to Charlotte for the Long Creek WWTP and modify the limits of the MT.
HOLLY NPDES permit;
NOW THEREFORE, in consideration of the foregoing recitals and mutual covenants
contained herein, the Parties agree as follows:
1. Transfer from Charlotte to Mt. Holly Pre -Regional Plant Construction
As of the effective date of this Agreement and continuing until construction of the
conveyance facilities and connection of the Mt. Holly Collection System thereto, Charlotte
agrees to transfer the portions of the Clarient Nutrient Allocations for Total Nitrogen and Total
Phosphorus to Mt. Holly (the "Mt. Holly Nutrient Transfer") based upon the projected totals and
limits shown in the table below.
radl;i
Sum�cn-er "'fi
i z
W9tt4 `*
AnnUal'`8 '
(lb/day)
(lb/season)
fib/day)
(lb/sea3on)
(lb/day)
(lb/senon)
Clarlant Corp.
31.5
6,741
31.5
4,757
4.0
1,460
Long Creek Regional WWTP (future)
0
0
0
0
0
0
Mount Holly WWTP
Belmont WWTP
523.2
414.3
111,973
823.5
124,345
86.0
31,405
88,656
764.6
115,449
58.4
21,309

2. Transfer fiom Mt. Holly to Charlotte After Regional Plant Construction
Upon completion of the connection of the MT. HOLLY Collection System to the
Charlotte System, Mt. Holly agrees that it will transfer back to Charlotte the total nutrient
allocation contained in its permit which will include the Clariant Nutrient Allocations conveyed
to it in the Mt. Holly Nutrient Transfer based upon the projected totals and limits shown in the
table below so that DEQ can modify the Charlotte NPDES permit for the Regional Plant and
rescind the Mt. Holly NPDES permit when requested to do so by Mt. Holly.
5ummer TN
Wi1ti i'�trv�
{ j
Facility
(Ib/day)
flb/se6sdn)
�
(IbJse son)
(lb/da,�i) :
'r(? seasvnj
Long Creek Regional WWTP 7
937.5
200,629
1,588
239,794
144A
52,713
(future)
Mount Holly WWTP
0
0
0
0
0
0
Belmont WWTP
0
0
0
0
0
0
IN WITNESS WHEREOF, the Parties hereto have caused the this Agreement to be
executed the day and year first above written.
ATTEST:
14�9
Eva V/
'"7
kllol
CITY OF CHAROTTE
4�1TY OF MOUNT
$ . ^ �0 BV /
Danny i c
City Manager
Manager
3

Projected Nitrogen and Phosphorus Limits
Lake Wylie Nutrients TMDL
Catawba River Subwatershed
October 17, 2018
This document describes how the NC DEQ Division of Water Resources proposes to set TN and
TP limits for the existing Clariant Corporation, Belmont, and Mount Holly WWTPs and the
proposed Charlotte - Long Creek Regional WWTP from the present until the regional plant
comes online. These four NPDES facilities are subject to the Lake Wylie Nutrient TMDL and
discharge to the Catawba River. The permittees reviewed the February 10, 2017, draft of this
document and offered no comments or objections.
Background and Purpose
The Lake Wylie Nutrient Management Strategy is a TMDL approved by EPA Region 4 in 1996
for the North Carolina portion of Lake Wylie'. The strategy established allowable loads of Total
Nitrogen (TN) and Total Phosphorus (TP) in the lake and its major tributaries. It also set
individual wasteload allocations (WLAs) for six POTWs and one industrial WWTP (now a
POTW) and a strategy for new/ expanding discharges. It specified that nutrient limits for other
industrial WWTPs should be set based on BAT determinations at each facility.
The Division has since implemented the TMDL through the NPDES permits of the affected
dischargers. The TN and TP limits have been expressed in different ways - concentration or
mass load, seasonal or annual - according to the circumstances of each permit.
The City of Charlotte proposes to construct a new regional WWTP that will discharge to the
Catawba River. The City must acquire nutrient allocations for the new plant in order to satisfy
the TMDL. Toward that end, it has purchased TN and TP allocations from Clariant Corporation
and has entered into agreements with Mount Holly and Belmont for the connection of their
collection systems to the regional system. Under the agreements, Charlotte will transfer the
Clariant allocations to the two cities while the regional plant is constructed and the connections
made. Belmont and Mount Holly will, in turn, connect and transfer all of their allocations back
to Charlotte for the regional plant.
In order to execute these transfers, the Division of Water Resources must ensure that all nutrient
limits for the affected facilities are expressed as mass loads (rather than concentrations) and for
similar compliance periods (seasonal or annual).
Rationale
The TMDL sets the nutrient allocations/ limits for the individual facilities as average
concentrations and as the equivalent daily mass loads. It sets TP allocations as the annual
average values and TN allocations for POTWs as season -long averages for the summer season
only (Apr -Oct).
Three industrial facilities, including Clariant, completed BAT determinations and received
technology -based, facility -specific limits for TN and TP. In contrast to the POTWs' limits, all of
the industrial limits were set as the annual average of daily mass loads.
All of the affected dischargers' permits include annual limits for TP, though some are expressed
as concentrations, others as mass loads. Setting all TP limits as annual mass loads provides the
necessary form and consistency and has minimal impact on the dischargers.
I For the purposes of the TMDL and its implementation, Lake Wylie is defined as the Catawba River and its
tributaries from the Mountain Island Lake Dain to the Lake Wylie Dam

All of the permits also include (or will include) TN limits. However, achieving consistency is
more challenging here. Some of these ]units are seasonal, and one is annual; some are
concentrations, others are mass loads.
The TN limits can be converted to mass loads, but either the industrial limits must be switched
from annual to summer -only limits or, alternately, the POTWs' limits must be switch from
summer -only to annual limits. Because the industrial limits are technology -based, reducing
them to summer -only values would violate state and federal antidegradation policy. On the
other hand, switching the POTWs limits to annual values, while a potential added burden and
not required by the TMDL, does align them with the industrial permits.
To gain year-round coverage, the TN limits could simply be set as annual limits; however,
summer limits would still be required to satisfy the TMDL requirements. Setting TN limits as
separate seasonal limits would also provide the necessary coverage, but it has certain
advantages: it separates summer limits (specified by the TMDL) from winter limits (not
specified), and the two limits do not overlap.
Proposed Approach
The Division proposes to use the following approach to set TP and TN limits to resolve these
differences:
1. Set annual mass TP limits (pounds per calendar year) equivalent to 1.0 mg/L TP for
POTWs and equivalent to the approved BAT determinations for industry:
2. Set summer -only mass TN limits (pounds per season) equivalent to the allocations given in
the TMDL for POTWs and the BAT determinations for industry.
3. Set winter -only mass TN limits (pounds per season) equivalent to 12.0 mg/L TN for
POTWs and the BAT determinations for industry.
Setting the POTWs' winter limits equivalent to 12 mg/L TN, or twice the summer equivalent
concentration, is meant to provide the necessary year-round coverage while limiting the
potential burden to the POTWs.
The attached tables provide details of the proposed allocations and limits for the four facilities
for the next several years, as Charlotte moves forward with the regional plant project. The
results at each step are summarized more briefly below.
Projected Nutrient Limits
SteLi 0: Nutrient Allocations - Catawba River
This table summarizes the allocations already established for the three existing facilities,
expressed as seasonal or annual mass loads. (See the attached tables in lk_wylie-nuts Iimits-
proposed revisions-20171116.xlsx for details of their derivation.)
Facility
Summer TN
Winter TN Annual TP
(lb/day)
(lb/season)
(lb/day)
(lb/season) (lb/day) (lb/year)
Mount Holly WWTP
300.2
64,251
-
50.0 18,265
Belmont WWTP
350.3
74,960
-
- 58.4 21,309
Clariant Corp.
318.5
68,159
318.5
48,094 40.0 14,600
2
Lk Wylie - Catawba River subwatershed - phased NP limits - final - 20181015
1/111201911:10 AM

So 1: Transfer from Clariant to Charlotte
Charlotte has purchased approximately 90% of Clariant's TN and TP allocations: 287 lb/day TN
and 36 lb/day TP. The Division will modify Clariant's permit to reflect the transfer and to
express its reduced limits as summer and winter mass TN loads and an annual mass TP load.
The allocations before and after the transfer are as follows:
Facility
Summer TN
Winter TN
Annual TP
(lb/day)
(lb/season)
(lb/day)
(lb/season)
(lb/day)
(lb/year)
Clariant Corp.
318.5
68,159
318.5
48,094
40.0
14,600
90% to Charlotte:
-287.0
-61,418
-287.0
-43,337
-36.0
-13,140
Remaining (10%):
31.5
6,741
31.5
4,757
4.0
1,460
Long Creek Regional WWTP (future)
0
0
0
0
0
0
Purchased from Clariant:
287.0
61,418
287.0
43,337
36.0
13,140
Initial Allocations:
287.0
61,418
1 287.0
43,337
36.0
13,140
Note: The summer and winter TN limits are based on the same daily load value but are
significantly different due to the different lengths of the seasons: 214 days for summer (Apr -
Oct) and 151 days for winter (Nov -Mar). The TP limits are based on daily loads times 365 days.
Step 2: Transk from Charlotte to Belmont and Mount Holly
Belmont and Mount Holly have entered into agreements with Charlotte to connect to the new
Long Creek plant, which is projected to come online in the next five years. In the meantime,
Charlotte will transfer its nutrient allocations to Belmont and Mount Holly so that they are not
forced to upgrade their plants to meet their TN and TP limits. The two cities have agreed on
how to divide the added allocations to meet their needs, and these values are shown in the table
below.
The resulting limits are projected as follows. The limits for Belmont and Mount Holly are the
sum of the POTWs' allocations and the additional allocation from Charlotte.
Facility
Summer TN
Winter TN
Annual TP
(lb/day)
(Ib/season)
(lb/day)
(lb/season)
(lb/day)
(lb/year)
Clariant Corp.
31.5
61741
31.5
4,757
4.0
1,460
Long Creek Regional WWTP (future)
0
0
0
0
0
0
Mount Holly WWTP
523.2
111,973
823.5
124,345
86.0
31,405
Belmont WWTP
414.3
88,656
764.6
115,449
58.4
21,309
The Division will renew the Belmont permit and modify the Mount Holly permit to include the
new limits and will issue Charlotte's Long Creek permit at the same time. Initially, the Long
Creek permit will show nutrient allocations and limits of zero, because they have been
transferred to the other permits. This will be revised in the next step.
Step 3: Transfer from Belmont and Mount Holly to Charlotte
Upon completion of the Long Creek plant and connection of the Belmont and Mount Holly
collection systems, the two cities' allocations will transfer to Charlotte and the Long Creek
permit.
3
Lk Wylie - Catawba River subwatershed - phased NP limits -final - 20181015
11111201911:10AM

To enact the transfers, the Division must act on all three permits simultaneously. It will modify
the Charlotte permit to include the transferred allocations and resulting limits and, presumably,
rescind the Belmont and Mount Holly permits at the Cities' request.
The projected limits are as follows:
Facility
Summer TN
Winter TN
Annual TP
(lb/day)
(lb/season)
(lb/day)
(lb/season)
(lb/day)
(lb/year)
Long Creek Regional WWTP (future)
937.5
200,629
1,588
239,794
-144.4
52,713
Mount Holly WWTP
0
0
0
0
0
0
Belmont WWTP
0
0
0
0
0
0
Ste 4: Phased Limits for Charlotte - LoLig Creek Re Tional VWVTP
Charlotte currently plans to build the Long Creek plant in two phases: 15 MGD to start, then
expansion to 25 MGD when needed. By the time the plant is operational, the City will hold
allocations equivalent to 937.5 lb/ day TN summer, 1,588 lb/ day TN winter, and 144.4 lb/ day
TP.
In the initial 15 MGD phase, these allocations exceed the 6.0 mg/L TN and 1.0 mg/L TP
standards established in the TMDL, as well as the 12.0 mg/L value now set for winter TN.
Therefore, the Division expects to calculate the plant's nutrient limits as the mass loads
equivalent to the set concentrations at the 15 MGD design flow. The remainder of each
allocation will be held in reserve, and the permit will apply the active allocations as limits and
also note the reserve allocations.
Once the plant expands to 25 MGD, the full allocations can be applied and will be equivalent to
4.5 mg/L TN summer, 7.6 mg/L TN winter, and 0.7 mg/L TP at full design flow.
The allowable limits for each phase are as follows:
Facility
Summer TN
Winter TN
Annual TP
(mg/L)
(lb/day)
(lb/season)
(mg/L)
(lb/day)
(lb/season)
(mg/L)
(lb/day)
(lb/year)
Long Creek RWWTP (Holdings)
-
937.5
200,629
1,588
239,794
-
144.4
52,713
Phase 1: Limits @ 15 MGD
6.0
750.6
160,628
12.0
1,501
226,681
1.0
125.1
45,662
Phase 1 Reserve
186.9
40,001
86.8
13,113
19.3
7,052
Phase 2: Limits @ 25 MGD
4.5
937.5
200,629
7.6
1,588
239,794
0.69
144.4
52,713
Phase 2 Reserve
0
0
0
0
0
0
4
Lk Wylie - Catawba River subwatershed - phased NP limits - final - 20181015
11111201911:10 AM

ROY COOPER
tToraAtr .
MOM
L & BEGAN
swrawy
UNDA" CULPEPPER
Dhio�w
August 20, 2019
MEMORANDUM
To: COnton Cook
NC DBQ 1 DWR / PWS Regional Eagineer
Moolvid Je Reglmo Office .
Fro= tasry.Peffinsa r
919-907-36�1
NPDES.Unit
Opposes ft issuance offt above permit, based o® reasons stated below, or attAcbed:
WMom sakaysuus i ■vW4romc*' iv i m*'gkNa*QW0ipuvmII-WI
mmaml

Attachment 1
I have no appreciable expertise in implementation of the Clean Water Act requirements and have
minimal understanding of the information provided. As a result, I have no basis for opposing the permit.