NC0046728_Fact Sheet_20240910

NCO046728
Fact Sheet
NPDES Permit No. NCO046728
Permit Writer/Email Contact: Gary Perlmutter, [e-mail]
Date: September 10, 2024
Division/Branch: NC Division of Water Resources/NPDES Municipal Permitting Unit
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑X Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant — Facility Name:
Town of Mooresville — Rocky River WWTP
Applicant Address:
P.O. Box 878, Mooresville, NC 28115
Facility Address:
369 Johnson Dairy Road, Mooresville, NC 28115
Permitted Flow:
7.5 MGD
Facility Type/Waste:
MAJOR Municipal; 88% domestic, 12% industrial'
Facility Class:
Grade IV
Treatment Units:
Influent screw pump; Equalization tanks; Mechanical screens; Aeration
basins; Final clarifiers; Mixing tower; Filtration; UV disinfection; Cascade
aeration; RAS/WAS pumps; Aerobic digesters (diffused air); Filter belt
press; Covered sludge storage area
Pretreatment Program (Y/N):
Yes
County:
Iredell
Region:
Mooresville
Footnote:
1. Based on total permitted SIU flow of 0.9 MGD.
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NCO046728
Briefly describe the proposed permitting action and facility background: The Town of Mooresville has
applied for NPDES permit renewal for its Rocky River WWTP, and submitted a renewal application dated
9/27/2023, received by the Division on 3/5/2024. Review of the application found that an outdated EPA
Form 2A application was used, so the Permittee was requested to resubmit using the current form. The
original application included the following attachments:
1. Process narrative
2. Topographical map
3. Process flow diagram
4. Effluent Pollutant Scan laboratory reports
5. Toxicity test reports, both quarterly Ceriodaphnia and four Fathead Minnow (2" species)
6. Industrial User Discharges
7. eDMRs from July — December 2022
A resubmittal was requested on 5/23/2024; received on 6/25/2024. The Town submitted a Chemical
Addendum on 3/29/2022, listing only Bis(2-ethylhexyl) phthalate as a potential parameter of concern,
noting that the result of 8 µg/L is likely a false positive as subsequent results were nondetects.
This facility serves a population of—47,500 residents in the Town of Mooresville. The Town operates a
pretreatment program with a long-term monitoring plan (LTMP) and receives industrial waste from three
(3) Significant Industrial User (SIUs), none of which are Categorical Industrial Users (CIUs).
The Town submitted a modeling plan to the Division in March 2024 in support of a potential flow expansion
and relocation of the outfall to Lake Norman. Based on the extensive time to process modeling and
speculative limits development, which also includes an inter -basin transfer for the potential outfall
relocation, only the current flow tier is considered in this permit renewal.
Inflow & Infiltration (I&I). The City reported on its NPDES permit renewal application an average daily
volume of 0.0038 MGD I&I. To minimize I&I, the Town is using cameras to look for sources of I&I in the
lines and if found make needed repairs or replacements.
Sludge Management Plan. Waste Activated Sludge is digested, thickened, and dewatered to a Class A
biosolids to be land applied under permit WQ0036723.
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NC0046728
2. Receiving Waterbody Information
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 — Dye Creek (Branch)
Stream Segment:
13-17-2
Stream Classification:
C
Drainage Area (mi2):
4.8
Summer 7Q 10 (cfs)
0.5
Winter 7Q10 (cfs):
0.9
30Q2 (cfs):
1.1
Average Flow (cfs):
5.0
IWC (% effluent):
96
2022 303(d) listed / parameter:
Yes / Benthos
Subject to TMDL / parameter:
Rocky River TMDL for Fecal Coliform (2002)
Statewide TMDL for Mercury (2012)
River Basin / HUC:
Yadkin -Pee Dee / 03040105
USGS Topo Quad:
Mooresville, NC
The overall assessment category of the receiving stream in 2022 is Exceeding Criteria (Category 5),
meaning it is impaired, based on successive Poor ratings for Benthos in 1985, 1990, 2001 and 2006. The
Benthos Station QB316, located —1.1 mile above the outfall in Dye Creek was last rated Fair in September
2001; Station QB315, located —350 ft below the outfall in Dye Creek was rated Poor in August 2006. The
receiving stream is —86 miles upstream of the nearest water supply boundary, WS-IV for the Blewett Falls
Lake.
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NC0046728
3. Effluent Data Summary
Effluent data is summarized below for the period November 2019 - May 2024.
Table 1. Effluent Data Summary
Parameter
Units
Average
Max
Min
Permit Limit'
Flow
MGD
5.169
12.255
2.508
7.5 MGD
BOD5 summer
mg/L
3.5
38
< 2
MA = 5.0
(Apr 1 - Oct 31)
WA = 7.5
BOD5 winter
mg/L
g
4.3
45
< 2
MA = 10.0
(Nov 1 - Mar 31)
WA = 15.0
BOD removal
%
99.01
99.85
88.78
> 85
Total Suspended Solids (TSS)
mg/L
6.9
191
< 2.5
MA = 30.0
WA = 45.0
TSS removal
%
98.60
99.99
50.82
> 85
NH3-N summer
mg/L
0.3
9.1
< 0.1
MA = 1.0
(Apr 1 - Oct 31)
WA = 3.0
NH3-N winter
mg/L
0.3
5.6
< 0.1
MA = 2.0
(Nov 1 - Mar 31)
WA = 6.0
Dissolved Oxygen (DO)
mg/L
8.94
15.30
7.44
DA > 6.0
pH
SU
7.41
8.54
6.68
6.0 - 9.0
Fecal Coliform
#/100 mL
24.6
60,000
< 1
MA = 200
(geometric mean)
WA = 400
Total Residual Chlorine (TRC)
µg/L
19.4
26
< 15
DM = 17 2
Temperature
°C
20.0
27.0
12.4
Monitor & Report
Total Nitrogen (TN)
mg/L
20.45
34.40
4.48
Monitor & Report
Total Phosphorus (TP)
mg/L
1.96
5.20
0.18
Monitor & Report
Total Copper
µg/L
4.3
12.9
2.2
MA = 19.5 µg/LDM
= 28.3 µg/L
Total Hardness
mg/L
80.2
107
49
Monitor & Report
Footnote.
1. MA = Monthly Average; WA = Weekly Average; DA = Daily Average; DM = Daily Maximum.
2. Values up to 50 µg/L are considered compliant.
The maximum annual average daily flow was 5.43 MGD or 74.2% of the permitted flow in 2023.
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NCO046728
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions when
model results for instream DO are within 1 mg/1 of instream standard at full permitted flow; 2) to verify
model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other instream
concerns. Instream monitoring may be conducted by the Permittee, and there are also Monitoring Coalitions
established in several basins that conduct instream sampling for the Permittee (in which case instream
monitoring is waived in the permit as long as coalition membership is maintained).
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): YES.
Name of Monitoring Coalition: Yadkin Pee Dee River Basin Association (YPDRBA).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: The current permit requires instream monitoring for DO, Temperature, and Total Hardness.
Hardness monitoring is upstream only, for use in calculation of hardness -dependent dissolved to total metal
standards for toxics assessment (see Section 6.4 below). The upstream location is in Dye Creek, - 1Y2 mile
above the outfall, and the downstream location is in the Rocky River at NCSR 2420 (E Rocky River Rd)
and NCSR 1394 (Davidson Rd), —3.75 mi below the outfall in Mecklenburg County. Instream monitoring
is provisionally waived in light of the Permittee's participation in the Yadkin Pee Dee River Basin
Association (YPDRBA, monitoring coalition).
Data were available for review only from the permit's downstream location as that is also the location for
the Division's Ambient Monitoring System (AMS) Station Q7330000 as the outfall is —3.8 miles from the
Dye Creek headwater, as no stations are located upstream of the outfall and the closest YPDRBA station
downstream is in the Rocky River, and thus not representative of Dye Creek. Station data were obtained
from the Water Quality Portal website (https://www.waterqualitydata.us/) spanning January 2019 —
December 2022 plus supplemental raw data collected from January 2023 — March 2024 from AMS staff.
Among the more recent raw data is a gap from February — August 2023 where no samples were collected
due to staffing issues. The data were reviewed and checked against applicable stream standards as well as
the results of the 2022 Integrated Report for the Rocky River (Stream Index 13-17).
Table 2. Instream Data Summary (downstream only).
Parameter 1
Units
Average
Max
Min
Standard
DO
mg/L
9.2
11.9
7.1
DA = 5.0
4.0 (instantaneous)
Temperature, °C
°C
16.0
27.7
5.7
32.0
Specific Conductance
µS/cm
302
498
127
NA
Fecal Coliform
cfa/100 mL
445 (geomean)
6000
96
MA = 200
WA = 400
(geomean)
1,4-Dioxane
µg/L
1.1
2.2
1.0
NA
Ammonia
mg/L
0.05
0.38
0.02
NA
Chloride
mg/L
26.4
38
12
230
Fluoride
mg/L
0.47
0.64
0.4
1800
Hardness (as CaCO3)
mg/L
66
110
50
NA
TKN
mg/L
0.6
1.3
0.2
NA
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NCO046728
Parameter 1
Units
Average
Max
Min
Standard
NO2+NO3
mg/L
8.9
17
2.1
NA
pH
SU
7.3
8.3
6.6
6.0 — 9.0
Phosphorus
mg/L
1.0
2.2
0.15
NA
Sulfate
mg/L
18
24
10
NA
TSS
mg/L
36
125
8
NA
Turbidity
NTU
19
170
3
50
Footnote
1. Permit -required parameters are in bold.
Dissolved Oxygen (DO) — DO is in the permit as a parameter of concern for aquatic life. The overall
minimum at the downstream station was above the stream standard of 5.0 mg/L. The Rocky River is listed
as Meeting Criteria for DO in the 2022 Integrated Report.
Temperature — Temperature is in the permit as a parameter of concern for aquatic life. The overall maximum
was below the 32°C standard for lower piedmont and coastal plain waters. The Rocky River is listed as
Meeting Criteria for Temperature in the 2022 Integrated Report.
Conductivity — Conductivity monitoring is not required in the permit, neither effluent nor instream. The
City has an active pretreatment program with three SIUs. Specific Conductance was monitored instream, a
parameter related to Conductivity, but at 25°C. To better understand the effluent's influence on the instream
Conductivity, this parameter will be added to the permit both in the effluent and instream per 15A NCAC
02B .0508.
Fecal Coliform Fecal Coliform instream monitoring is not in the permit. The 2022 Integrated Report
assessed the receiving stream as Data Inconclusive based on Fecal Coliform data collected in 2020, which
may be exceeding the instream standard of a geometric mean of 200/100 mL based on at least 5 samples
collected over a 30-day period or 400/100 mL in more than 20% samples collected during such period (15A
NCAC 02B .0211). Instream data are collected by AMS once a month, and upon review, the downstream
geometric mean is > 400/100 mL with over 76% of samples being > 200/100 mL and over 46% of samples
> 400/100 mL (Table 2), suggesting a high likelihood that the stream is impaired if sufficient sampling
were conducted. Based on the likelihood that the receiving stream is impaired, instream monitoring for
Fecal Coliform has been added to the permit.
Other parameters of the 2022 Integrated Report found pH, Chloride and Fluoride to be meeting criteria
from 2020 samplings; instream data agree with the above assessments. Turbidity was assessed as exceeding
criteria from a 2020 collection; instream data found the average to be below the standard of 50 NTU, but
three samplings recorded over it: 85 NTU on 8/14/2019, 170 NTU on 12/11/2023, and 55 NTU on
1/31/2024. No changes are proposed for other parameters reviewed in this assessment.
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NC0046728
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): From June 2019 through April
2024 the facility had reported two weekly average BOD exceedances, in April 2021 resulting in a Notice
of Violation, and another in June 2023, resulting in an enforcement case. In May 2024 the facility reported
several BOD, Fecal Coliform and Ammonia exceedances, but no action was taken. According to that
month's eDMR comments, the facility was experiencing higher than normal solids inventory due to
mechanical issues involving the sludge dryer. Repairs were delayed due to unforeseeable events, causing
Operations to bypass the dryer for multiple weeks until repairs were made. DWR was notified of the event.
Summarize the compliance record with aquatic toxicity test limits and any second species test results (past
5 years): The facility passed 17 of 17 quarterly chronic toxicity tests as well as four of five second species
chronic toxicity tests, sampled in November 2021, February 2022 (pass), May 2022 (pass), August 2022
(fail) and September 2022 (pass).
Summarize the results from the most recent compliance inspection: The most recent facility inspection,
conducted on 2/20/2024, reported that overall, the facility appeared to be properly maintained and operated
with no compliance issues reported. The most recent pretreatment inspection, conducted on 2/24/2024,
found that the Town's pretreatment program is properly implemented.
6. Water Quality -Based Effluent Limitations (WQBELs)
6.1. Dilution and Mixin Zones
ones
In accordance with 15A NCAC 213.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q 10 streamflow (acute Aquatic Life); 7Q 10 streamflow (chronic Aquatic
Life; non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA.
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B.0204(b): NA.
6.2. Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
(e.g., BOD = 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: BOD limits in the
current permit are from speculative limits determined for a proposed 19.0 MGD flow expansion in 2007,
based on recommendations in the 2003 Yadkin -Pee Dee Basin Plan, and applied to the 7.5 MGD expansion
in the 2009 permit. No changes were made.
6.3. Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing ammonia chronic criteria of 1.0
mg/L (summer) and 1.8 mg/L (winter). Acute ammonia limits are derived from chronic criteria, utilizing a
multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non -Municipals.
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection
of aquatic life (17 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.
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Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: The current
Ammonia limits were placed in the 2009 permit modification for the 7.5 MGD flow tiers based on
speculative limits as an oxygen -consuming waste for a proposed expansion to 19.0 MGD prepared in 2006.
Ammonia was reviewed in the attached Wasteload Allocation (WLA) sheet for protection against ammonia
toxicity, finding the current limits to be protective. No changes were made.
The current TRC limit was also placed in the 2009 permit with the introduction of the 7.5 MGD flow tier,
based on 19.0 MGD speculative limits in 2006. Review of TRC in the attached WLA found the current
limit protective. No changes were made.
6.4. 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 (RP), 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/z detection limit
for "less than" values; and 4) streamflows used for dilution consideration based on 15A NCAC 2B.0206.
Effective April 6, 2016, NC began implementation of dissolved metals criteria in the RPA process in
accordance with guidance titled NPDES Implementation of Instream Dissolved Metals Standards, dated
June 10, 2016.
The current permit requires effluent and upstream hardness monitoring for use in the RPA. Hardness data
were obtained via DMR for review; averages were 80 mg/L effluent and 37 mg/L upstream. These data
were used in the RPA.
An RPA was conducted on effluent toxicant data collected between November 2019 and May 2024 for the
following parameters: arsenic, cadmium, total chromium, copper, cyanide, lead, molybdenum, nickel,
selenium, silver, and zinc. Pollutants of concern included toxicants with positive detections and associated
water quality standards/criteria. Based on this analysis, the following permitting actions are proposed for
this permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable water
quality standards/criteria: 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: Copper.
• 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: Arsenic,
Cadmium, Cyanide, Lead, Molybdenum, Nickel, Selenium, Silver, Zinc.
o Selenium had one detection at 10 µg/L, which was found in error; instead, it was a non -
detect at < 10 µg/L. Therefore, no monitoring is required.
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans (July 2021, October 2022
and January 2023) were evaluated for additional pollutants of concern. The following parameters
were detected in the scans and evaluated: Total Phenols.
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.
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o The following parameter(s) will receive a monitor -only requirement, since the maximum
predicted value of a limited dataset was greater than the allowable discharge concentration:
Total Phenols.
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
6.5. Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
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 with a chronic WET limit of 90% at
7.5 MGD flow, monitored quarterly. No changes were made.
6.6. Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply with
EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (^2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (> 1 ng/L) will receive
an MMP requirement. Industrials are evaluated on a case -by -case basis, depending if mercury is a pollutant
of concern. Effluent limits may also be added if annual average effluent concentrations exceed the WQBEL
value (based on the NC WQS of 12 ng/L) and/or if any individual value exceeds a TBEL value of 47 ng/L.
The current permit does not have an MMP requirement, as it was removed in the 2019 renewal based on
data review not finding any results > 2.5 ng/L. Nevertheless, the Town has reported results of 100%
compliance with the Dental Amalgam Rule in their 2023 Pretreatment Annual Report. Mercury data are
collected quarterly through the Town's LTMP. These data were reviewed for TMDL evaluation (Table 3).
Table 3. Mercury Effluent Data Summary
2020
2021
2022
2023
2024
Number of Samples
1
4
4
2
Annual Average Conc. ng/L
1.0
0.7
0.9
0.7
0.5
Maximum Conc., ng/L
1.00
1.00
1.69
0.93
0.50
TBEL, ng/L
47
WQBEL, ng/L
12.5
Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL at either flow tier, and no individual mercury sample exceeded the
TBEL (Table 5), no mercury limit is required. Several samples had quantifiable levels of mercury, but only
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one was > 1.0 ng/L but < 2.0 ng/L. Therefore, an MMP is not deemed necessary and was not added to the
permit.
6.7. Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: The facility discharges into a receiving stream that is not under a TMDL or nutrient
management strategy. The current permit requires monthly monitoring for Total Nitrogen and Total
Phosphorus, in accordance with 15A NCAC 02B .0508. To better understand the total nitrogen in the
effluent, monthly monitoring for Total Kjeldahl Nitrogen (TKN) and Nitrate -Nitrite (NO3+NO2) has been
added to the permit. No other changes were made.
6.8.Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: The facility discharges
into a receiving stream —86 miles above the nearest water supply boundary, WS-IV for the Blewett Falls
Lake. None of the Town's three SIUs are a potential source of 1,4-Dioxane, so this parameter is not
expected in the effluent. Therefore, no 1,4-Dioxane requirements have been added to the permit.
Due to the pervasiveness of PFAS chemicals in the environment, the presence of a downstream water supply
and the facility's receiving industrial waste from one textile SIU, an industry type recognized by the EPA
as a potential PFAS source, quarterly PFAS monitoring will be required in the permit with delayed
implementation. See Section 10 — Monitoring Requirements below for details.
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. 010 7(c) (2) (B), 40CFR 122.47, and EPA May 2007 Memo: NA.
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B.0226 for this permit renewal: NA.
7. Technology -Based Effluent Limitations (TBELs)
Municipals (if not applicable, delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/L
BOD51TSS for Monthly Average, and 45 mg/L for BOD51TSS 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. Review of submitted removal
rates of both parameters found no (0) occurrences of < 85% BOD removal and four (4) occurrences of <
85% TSS removal.
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
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review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit must
document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all cases,
existing instream water uses and the level of water quality necessary to protect the existing use is maintained
and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA.
9. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YESINO): YES. Total Copper limits have
been removed and monitoring frequency has been reduced from monthly to quarterly.
If YES, confirm that antibacksliding provisions are not violated: The change in Total Copper requirements
is based on RPA results using updated effluent and hardness data. The RPA demonstrated no reasonable
potential for an exceedance of Total Copper surface water standard. Monitoring is maintained to continue
tracking Total Copper in the facility effluent.
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.
All monitoring frequencies in the current permit follow 15A NCAC 02B .0508. Additional monitoring
requirements for the permit renewal include monthly NO2+NO3 and TKN. PFAS monitoring at a quarterly
frequency will be added to the permit to generate data for future evaluation. Implementation of PFAS
monitoring will be delayed until six months after the final EPA Method 1633 is published in the Federal
Register to allow laboratories to become certified in the new method.
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
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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 at 7.5 MGD'.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
MA = 7.5 MGD
Flow
Monitor influent or
No change
15A NCAC 2B .0505
effluent continuously
Summer:
MA = 5.0 mg/L
WA = 7.5 mg/L
WQBEL. Speculative limits for a
BOD5
Winter:
MA = 10.0 mg/L
No change
proposed 19.0 MGD proposed expansion
WA = 15.0 mg/L
in 2007.
Monitor influent &
effluent daily
MA = 30.0 mg/L
TSS
WA = 45.0 mg/L
No change
TBEL. Secondary treatment standards;
Monitor influent &
40 CFR 133; 15A NCAC 2B .0406.
effluent daily
Summer:
MA = 1.0 mg/L
WQBEL. Calculation results based on
WA = 3.0 mg/L
NC's use of EPA criteria in developing
Ammonia (NH3-N)
Winter:
No change
1.0 mg/L summer and 1.8 mg/L winter in
MA = 2.0 mg/L
wasteload allocations to protect against
WA = 6.0 mg/L
NH3-N toxicity. See WLA sheet
Monitor effluent daily
attached.
MA = 200 /100 mL
No change in effluent
WQBEL. WQ standard, 15A NCAC 2B
Fecal Coliform
WA = 400 /100 mL
Add instream
.0200.
Receiving stream may be impaired (rated
Monitor effluent daily
monitoring
as Data Inconclusive).
Total Residual
DM = 17.0 µg/L
No change
WQBEL. WQ standard, 15A NCAC 2B
Chlorine
Monitor effluent daily
.0200.
pH
Between 6 and 9 SU
No change
WQBEL. WQ standard, 15A NCAC 2B
Monitor effluent daily
.0200; .0500.
DA > 6.0 mg/L
DO
Monitor effluent daily
No change
WQBEL. State WQ standard, 15A
Monitor & report
NCAC 2B .0200; .0508.
instream
Monitor & report effluent
Temperature
daily
Monitor & report
No change
15A NCAC 2B.0508.
instream
Conductivity
No requirement
Add effluent and
15A NCAC 2B.0508; presence of SIUs.
instream monitoring
Page 12 of 14

NC0046728
Parameter
Current Permi
Proposed Change
Basis for Condition/Change
Total Nitrogen
Monitor &report effluent
No change
15A NCAC 2B.0508.
monthly
Total Kjeldahl
No requirement
Add monthly
To better understand nitrogen
Nitrogen (TKN)
monitoring
concentrations.
Nitrite -Nitrate
No requirement
Add monthly
To better understand nitrogen
(NO3+NO2)
monitoring
concentrations.
Total Phosphorus
Monitor & report effluent
No change
15A NCAC 2B.0508.
monthly
Quarterly effluent and
Remove instream
Based on adoption of hardness -
Total Hardness
upstream monitoring.
monitoring waiver.
dependent metals. Monitoring coalitions
will not sample for Hardness.
AA = 19.5 µg/L
Remove limits reduce
RPA: No RP found; max pred. value >
Total Copper
DM = 28.3 µg/L
monitoring to quarterly
50% allowable cone. using updated
Monitor monthly
Hardness data.
Add quarterly
RPA: RP found with limited dataset (n <
Total Phenols
No requirement
8 samples), no data above allowable
monitoring
cone.
PFAS
No requirement
Add quarterly
monitoring with delayed
EPA recommendations (guidance memo,
implementation
12/5/2022).
Ceriodaphnia dubia
Update language in
WQBEL. No toxics in toxic amounts.
Chronic Toxicity
Pass/Fail at 90 /o effluent.
special condition.
15A NCAC 2B.0200 and 15A NCAC
Monitor quarterly
213.0500.
Effluent Pollutant
Conduct three times per
Update sample years to
40 CFR 122
Scan
permit cycle
2026, 2027, 2028.
Electronic Reporting
Special Condition
Update language in
In accordance with EPA Electronic
special condition.
Reporting Rule 2015.
Footnote.
1. MGD = Million Gallons per Day; MA = Monthly Average; WA = Weekly Average; DA = Daily
Average; DM = Daily Maximum.
13. Public Notice Schedule
Permit to Public Notice: 07/27/2024
Per 15A NCAC 2H .0109 & .0111, The Division will receive comments for a period of 30 days following
the publication date of the public notice. Any request for a public hearing shall be submitted to the Director
within the 30 days comment period indicating the interest of the party filing such request and the reasons
why a hearing is warranted.
14. NPDES Division Contact
If you have any questions regarding any of the above information or on the attached permit, please contact
Gary Perlmutter at [phone] or via email at [e-mail].
Page 13 of 14

NC0046728
15. Fact Sheet Addendum (if applicable)
Were there any changes made since the Draft Permit was public noticed (Yes/No): Copies of the draft
permit were distributed to the Town, USEPA, and various internal Division representatives for review.
Comments were received from the Town, USEPA, and the Division's Aquatic Toxicology Branch (ATB).
The ATB agreed with the permit's aquatic toxicity requirements. Comments from the Town and USEPA
were lengthier than those by ATB; details of these comments and Division responses are attached as a Fact
Sheet Addendum.
If Yes, list changes and their basis below: No changes were made.
16. Fact Sheet Attachments (if applicable):
• Three Effluent Pollutant Scans
• Four 2nd species toxicity test reports
• NPDES Pretreatment POC form
• Benthos Site Details page
• Monitoring Report Violations
• WET Test summary
• Compliance Inspection report
• Pretreatment compliance inspection report
• Waste load allocations for TRC and NH3-N
• RPA sheets
• RPA Spreadsheet Summary and dissolved to total metal calculator
• Dissolved Metals Fact Sheet memo
• Mercury TMDL evaluations
• Comments from ATB, Town, USEPA
• Fact Sheet Addendum
Page 14 of 14

uerrc I oxrcrty Report Form -Chronic Fathead Minnow Multi -Concentration Test
Facility: Town of Mooresville WWTP NPDES # NCO046728 Pipe #: 001 County: I
x 1 \IL v1CI V
Signature of Oper in Responsible Charge
x DEC 3 0 20
MAIL ORIGINAL TO: Environmental Sciences Branch • Reviewed by ATB
Division of Water Quality
NC DENR 1- 3. 2Z
1621 Mail Service Center 5E[0w10
Raleigh, NC 27699-1621
Test Initiation Date/Time
11/17/21
/ 10:10 AM
% Eff. Repl.
1
2
4
Control Surviving #
Original #
f
Wt/original (mg)
__
45.0 Surviving #
Original #
Wt/orginal (mg)
65.0 Surviving #
Original #
Wt/original (mg)
90.0 Surviving #
Original #
Wt/original (mg)
95.0 Surviving #
Original #
Wt/original (mg)
100.0 Surviving #
Original #
Wt/original (mg)
Avg Wt/Surv. Control 0.7337
9
10
10
1;i0
10
10
10
0.6420
0.7360
0.7780
10
9
10
10
10
1
10
10
10
1
0.7940
0.7470
0.7710
0.8730
10
9
10
9
10
10
10
10
0.$260
0.6350J
0.9040
0.5640
8
9
9
8
10
9
10
1
10
0.7660
0.9367
0.66 00
0.7870
9
100
ff
10
1040
0.8520
1.0070
0.9070
10
10
9
7
10
10
10
1
10
1.1140
0.9350
0.8590
0.5650
% Survival 92.5%
Avg Wt (mg) 0.6805
% Survival 97.5%
Avg Wt (mg) 0.7963
% Survival 95.0%
0.7
Avg Wt (mg) 323
% Survival 87.2%
Avg Wt (mg) 0.7877
% Survival 95.0%
Avg Wt (mg) 0.8325
% Survival 90.0%
Avg Wt (mg) 0.8683
7-1
Test Organisms
RCultured In -House
Outside Supplier
Hatch Date: 1 U15/21
Hatch Time: 1130-1300
Water Quality Data
Day
Control
0
1
2
3
4
5
6 7
PH (SU) Init/Fin
78
/ 76
78
/ 7.5
7.7
High Concentration
PH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) Init/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp at Receipt (C)
7.7
I -
7.8
/ 7.7
7.7
/ 7.8
7.7
/ 77
7.7 / -
7.6 / 7.6
7.7 / 7.6
1 7.7 / 7.8
1 7.9 / 7.6
1 7.9 / Ta
$.1 / 8.1
----/ 8.0
8.5 / -
7.6 / 6.3
8.4 / 6.3
8.8 / 6.7
1 7.7 / 5.4
7.7 / 5.7
8.3 / 7.1
---/ 7.0
25.0 / -
24.9 / 25.2
24.8 / 25.5
24.7 / 25.4
125.1 / 25.7
25.0 / 25.3
24.8 / 25.2
---- / 24.6
1 9
11 /15/21
11/16/21
11 /18/21
24 hr
24 hr
24 hr
79.6
78.8
80.8
72.0
78.3
87.9
559 1
553
585
<0.05 1
<0.05 1
<0.05
0.4
0.8
1.6
Dilution H2O
Hardness (mg/L)
83.7
Alkalinity (mg/L)
58.2
Conductivity (umhos/cm)
313
DWQ Fonn AT-5 (1/04)
Survival
Growth Overall Result
• Normal
Hom. Var.
es
es
es ChV >100.00
es
NOEC
100.0%
100.0%
LOEC
>100.00%
>100.00%
ChV
>100.00%
>100.00%
Method
T-Test
T-Test
• Stats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
45%
2.41
-0.81
2.41
-1.08
65%
2.41
-0.38
2.41
-0.48
90%
2.41
0.81
2.41
-1.00
95%
2.41
-0.38
2.41
-1.41
100%
2.41
0.31
2.41
-1.75
rage 2 o16

usrn rozrcny report Form -Chronic Fathead Minnow Murd-Concentration Test
Facility: Town of Mooresville WWTP NPDES # NCO046728 Pipe #: 001 County:
x K_A% l
Signature of Operator
MAIL ORIGINAL TO: Environmental Sciences Branch
Division of Water Quality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
Test Initiation DateMime
08/17/22
/ 02:45 PM
% Eff. Repl.
1
2
4
Control I Surviving #
Original #
WUariginal (mg}
45.0 Surviving #
Original #
Wt/original (mg)
65.0 Surviving #
Original #
Wt/original (mg)
90.0 Surviving #
Original #
Wt/original (mg)
95.0 Surviving #
Original #
Wt/original (mg)
100.0 Surviving #
Original #
Wt/odginal (mg)
Avg WVSurv. Control 0.6960
w
10
10
10
9
10
10
10
10
0.6890
a.7320
0.7820
0.5230
5
7
7
7
10
10
10
10
0.2020
0.2170
1 0.2290
0.1480
6 5
3
2
10 10
10
10
0.2020 0,1790
0.1250
0.0990
4
1 5
1 4
3
10
1 10
1 10
10
0.1930 1
0.3510
1 0.1870
0.1650
5
2
4
2
10
10
10
10
0.2450
1 0.1480
0.2250
a.1150
4
3
3
4
10
10
10
10
0.1720
1 0.1260
0.1340
0.2250
% Survival
Avg Wt (mg) 0.6815
% Survival
Avg Wt (mg) 0.1850
% Survival
Avg Wt (mg) 0.1512
% Survival 40.0%
Avg Wt (mg) 0.2240
7-1
% Survival 32.5%
Avg Wt (mg) 0.1833
% Survival
Avg Wt (mg) 0.1643
Cause
and reduced larval fish
Test Organisms
Cultured In -House
X Outside Supplier
Hatch Date: 08/1622
Hatch Time: IMO-1630
Water Quality Data
Daly
Control
0 1
2
3
4
5
6
7
PH (SU) InitlFin
High Concentration
pH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) Init/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg1L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp at Receipt (C)
8.3
! -
7.7 !
8.2
7.7
! 7.9
7.8
7.7
7.7
! 7.7
7.7
/ 7.6
7.7
/ 7.8
-/
n Q
8.0
/ -
8.1
/ 8.1
7.7 /
7.8
7.8
/ 7.8
7.7
1 7.7
7.7
/ 7.7
7.6
/ 7.6
- /
7.8
8.6
t -
7.8
/ 7.4
8.8 /
7.8
8.7
/ 6.4
8.6
/ 6.7
8.3
/ 6.5
9.3
/ 6.9
-/
8.3
25.0
/ -
24.7
/ 25.2
24.6 1
25.0
24.8
/ 25.2
124.7
1 25.1
24.7
/ 25.2
25.2
/ 25.0
-1
24.8
1 2
Dilution H2O
Hardness (mg/L)
81.6
Alkalinity (mg/L)
57.0
Conductivity (umhos/cm)
306
Survival
Growth
Normal
no
om. Var.
H®
NOEC
<45.0%
<45.0%
LOEC
45.0%
45.0°%
ChV
<45.0%
<45.0%
Method
T-Test
Rank Sum
Overall Result
ChV
FAIL
Stats
Sunval
Growth
Conc.
Crkical
Calculated
Critical
Calculated
45%
2.41
4.96
11
10
65%
2.41
7.95
11
10
90%
2.41
7.90
11
10
95°%
2.41
8.86
11
10
100°%
2.41
8A9
11
10
l Page 2of6

Facility: Town of Mooresville WWTP
Minnow Multi -Concentration Test
NPDES # NCO046728
Signature of Operator In Responsible Charge (/
x
Signature of Laboratory SuDervisor
Pipe #: 001 County: I
MAIL ORIGINAL TO: Environmental Sciences Branch Reviewed b
202� Division of Water Quality B
JUN 10 NC DENR / ,' �, ZZ,,
1621 Mail Service Center ID
ul t.ar GripnC@S Section Raleigh, NC 27699-1621
Test initiation Datetrime
05/18/22
1 01:30 PM
% Eff. Repl.
1
2
4
Control Surviving #
Original #
Wt/odginal (mg)
45.0 Surviving #
Original #
Wt/original (mg)
65.0 Surviving #
Original #
Wt/odginal (mg)
90.0 Surviving #
Original #
Wtforiginal (mg)
95.0 Surviving #
Original #
Wt/odginal (mg)
100.0 Surviving #
Original #
Wt/odginal (mg)
Avg Wt/Surv. Control 0.7830
A
10
10
10
10
10
40
10
10
0.8500
0.8020
0.7090
0.7710
10
8
10
10
10
9
10
10
0.9290
0.8456
10.7990
0.9500
8
9
8
9
10
10
10
9
0.6220
0.8070
0.6790
0.9133
7
6
10
6
10
10
10
10
0.6640 1
0.5450
1 0.8550
0.6560
7
6
8
9
10
10
10
10
0.5430
1 0.6260
0.7560
0.9000
8
9
10
10
10
10
10
10
0.7790
1 0.7260
0.8160
0,9200
% Survival 100.0%
Avg Wt (mg) 0.7830
% Survival
Avg Wt (mg) 0.8809
% Survival 87.2%
77
Avg Wt (mg) 0.7553
% Survival 72.5%
Avg Wt (mg) 0.6800
% Survival
Avg Wt (mg) 0.7063
% Survival92.5%
Avg Wt (mg) 0.8103
Test Organisms
F Cultured
In-House
Outside Supplier
Hatch Date: 05/16122
Hatch Time: 1500-1630
Water Quality Data
Day
Control
0
1
2
3
4
5
6
7
pH (SU) InitlFin
DO (mg/L) Init/Fin
Temp (C) [nit/Fin
High Concentration
pH (SU) Init/Fin
DO (mg/L) Init1Fin
Temp (C) [nit/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp at Receipt (C)
7.8
/ 7.7
7.8
( 7.8
7.8
/ 7.5
7.7
/ 8.1
7.7
/ 7.8
7.7
/ 7.7
- /
7,6
li�
8.0
/ 6.88.3
/ 8.48.2
/8.1
I 7.0-1
7,2
24.5
24.4
/ 25.4
24.4
/ 25.4
24.5
! 25.1
24.6
/ 25.2
- !
24.6
7.8
/ -
8.2
/ 8.0
17.8 /
7.9
7.9
/ 8.0
18.0
/ 8.0
18.3
/ 7.8
1 8.1
1 7.9
--1
8.0
8.7
/ -
8.0
/ 7.0
9.6 /
6.9
9.0
/ 6.8
9.1
/ 6.9
7.6
/ 6.5
7.7
I 6.6
- I
7.8
25.0
! -
24.9
1 25.4
24.6 /
25.9
24.8
/ 25.4
24.9
/ 25.4
24.7
/ 25.1
24.7
/ 25.2
- I
24.6
Dilution H2O
Hardness (mg/L}
83.7
Alkalinity (mg/L)
58.3
Conductivity (umhos/cm)
303
Survival
Growth Overall Result
Normal
�Re�R
ChV
Hom. Var.
es
NOEC
65.0%
100%
LOEC
90.0%
>100%
ChV
76.5%
>100%
Method
T-Test
Steel's Test
Stats
Survival
Growth
Cone.
Critical
Calculated
Critical
Calculated
45%
2.41
0.42
10
23.00
65%
2.41
1.80
10
17.00
90%
2.41
3.44
10
14.00
95%
2.41
3.30
10
15.00
100%
2.41
1.09
10
20.00
D WQ Form A T-5 (1104)
Page 2 of 6

rmuenr i oxrcny neporr rorma:nromc rameaa minnow vaunt-uancenumuon i es[
Facility: Town of Mooresville WWTP NPDES It N00046728 Pipe #: 001 County: Iredell
Laboratory: Comments
Signature of Operator in Responsible Charge
X 41.
Signature of Laboratory Supervisor
MAif. ORIGINAL TO: Environmental Sciences Branch
Division of Water Quality
NC DENR
1621 Mall Service Center
Raleigh, NC 27699-1621
Test Initiation DatefTme 09/21/22 / 01:30 PM
% Eff. Repl.
control Surviving #
Original #
Wt/original (mg)
45.0 Surviving #
Original #
WUoriginal (mg)
65.0 Surviving #
Original #
Wt/original (mg)
90.0 Surviving #
Original #
Wt/original (mg)
95.0 Surviving #
Original #
Wt/orginal (mg)
100.0 Surviving #
Or
#
Wt/original (mg)
1 2
4 4
Avg Wt/Surv. Control 1 0.7166
9
9
9
10
9
9
10
10
0.6589
0.7822
0.5680
0.7940
9
9
10
9
10
10
10
9
0.6920
0.5830
1 0.5580
0.5667
9
10
9
10
9
10
9
10
0.7689
0.6110
0.7511
0.4230
8
10
8
10
9
10
9
10
0.6256
1 0.7520
0.5378
0.6840
8
7
8
8
10
10
10
10
0.5830
0.6090
0.6650
0.6260
9
8
8
Q10
10
10
190
1 0.6140
10.5900
0.5760
% Survival 1 97.4%
Avg Wt(mg)l 0.7008
% Survival 1 94.9%
Avg Wt (mg) 0.5887
% Survival 100.034
Avg Wt (mg) 0.6385
% Survival
Avg Wt (mg) 0.6496
% Survival
Avg Wt (mg) 0.6213
% Survival 85.0°k
Avg Wt (mg) 0.6198
Test Organisms
Cultured In -House
X Outside Supplier
Hatch Date: 09/19/22
Hatch Time: 1500-1630
RECEIVED
OCT 2 1 202
VtF���s' �v
�r��rc�_ � ` �dtirJn
Quality Data
Day
Control
0
1
2
3
4
5
6
7
pH (SU) Init/Fin
DO (mg/L) InitlFin
Temp (C) Init/Fin
High Concentration
pH (SU) [nit/Fin
DO (mg/L) Init/Fin
Temp (C) [nit/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlodne(mg/L)
Temp at Receipt ( C)
7.8
/ -
7.8
! 7.5
7.8
! 7.9
7.8
( 7.6
7.8
/ 8.5
7.8
/ 7.7
7.8
J 7.6
8.0
/ -
8.7
/ 7.3
8.5
! 7.4
8.2
/
/ 6.7
8.3
/ 6.7
24.7
/ -
24.6
! 25.2
24.6
1 24.8
24.3
/ 24.7
24.5
/ 25.2
24.4
/ 25.1
24.5
! 25.2
n 1 9 :q d S a
7.9
/ -
8.1
/ 7.6
7.5
/ 7.8
7.6
/ 7.8
7.9
/ 7.9
8.2
/ 8.0
8.1
/ 7.8
-/
7.9
9.5
/ -
8.7
/ 7.4
9.1
/ 7.7
9.4
/ 7.0
8.2
/ 6.8
8.6
/ 6.9
8.3
/ 6.6
-J
7.1
25.0
/ -
24.9
/ 25.2
25.3
/ 24.8
25.1
/ 24.7
25.0
/ 25.2
24.8
/ 25.1
24.7
/ 25.2
- /
25.1
Dilution H2O
Hardness (mg, L)
Alkalinity (mg/L)
ff3l
Conductivity (umhos/cm)
Survival
Growth
Normales
Hom. Var.
es
es
NOEC
90.0%
100.0%
LOEC
asnol
>100.0%
ChV
92.0%
>100.0%
Method
T-Test
T-Test
Stats
Survival
Conc.
Critcal
Calculated
45%
2.41
0.74
65%
2.41
-0.74
90%
2.41
0.90
95%
2.41
5.32
100%
2.41
3.50
Overall Result
CW
Pass
Growth
Critical
Calculated
2.55
1.71
2.55
0.95
2.56
0.78
2.55
1.22
2.55
1.24
DWO Form AT-5 (1104)
Page 2 of 6

r-muent i uxicity me art rorm-unronic ratrieao minnow
Facility: Town of Mooresville WWTP
Laboratory: RIVA1116111115111MM
x
Signature of Operator in Responsible Charge
x
of
ultl-Concentration Test
NPDES # NCO046728
MAIL ORIGINAL. TO: Environmental Sciences Branch
Division of Water Quality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
Test Initiation Dateffime
02/16/22
1 10:30 AM
% Eff. Repl.
1
2
Control Surviving #
Original #
Wt/original (mg)
45.0 surviving #
Original #
Wtforiginal (mg)
65.0 Surviving #
Original #
Wtloriginal (mg)
90.0 Surviving #
Original #
Wt/original (mg)
95.0 Surviving #
Original #
Wt/original (mg)
100.0 Surviving #
Original #
Wtloriginal (mg)
Pipe #: 001 County: Iredell
Avg WVSurv. Control 1.0284
8
1p
10
10
9
10
10
10
4.8867
1.0450
0.9790
1.0920
9
10
1 9
8
10
10
9
9
0.7830
1 0.9010
1.0000
0.8144
9
10
10
9
10
10
10
10
0.9110
0.8700
D.8470
D.63fl0
10
9
10 9
10
10
1 10 9
1.0310
0.8560 1
0.9380 0.9578
9
10
9
10
10
10
10
1
10
1
1,0090
1 0.7280
0.8960
0.8770
8 10
9
9
9 10
1 10
9
0.9367 1 1.0260
0.9680
1.0178
results
% Survival 1 97.4%
Avg Wt (mg) 1.0007
% Survival
Avg Wt (mg) 0.8746
% Survival 95.09/6
7-1
Avg Wt (mg) 0.8145
% Survival
Avg Wt (mg) 0.9457
7-1
% Survival 1 95.0%
Avg Wt (mg) 0.8775
% Survival
Avg Wt (mg) 0.9846
Test Organisms
eCultured In -House
X Outside Supplier
Hatch Date: 02114/22
Hatch Time: -1-2-eieAM
1500 - 1630
Water Quality Data _ Day
Control 0 1 2 3 4 5 6 7
pH (SU) Init/Fin T7 ! - 7.7 / 8.1 7.8 I 7.8 7,S / 7.6 7.8 / 7.6 7.7 / 8.0 T8 / 7.8 ---- / q
DO (mg/L) Init/Fin 7.8 / - 7.9 1 7.6 8.6 / 6.0 8.5 / 6.3 8.2 1 6.5 8.0 1 6.3 8.1 / 5.2 ---- 1 Temp (C) IniVFin 24.7 ! - 0.0 1 25.2 0.0 / 25.5 0.0 1 25.5 0,0 ! 25.3 OA ! 25.2 0.0 ! 25.7 - -1 2
High Concentration
pH (SU) Init/Fin
DO (mg/L) InitlFin
Temp (C) Init/Fin
n 1 9 z d r c
7.9
1 -
8.0
/ 8.0
7.6
/ 7.9
7.8
/ 7,9
7.7
/ 7.9
7.7
1 7.9
8.2
1 7.8
1
9.0
/ -
8.8
/ 7.0
9.4
1 6.6
8.6
/ 6.6
8.7
/ 6.7
8.5
/ 6.6
8,0
! 5.6
25.0
1 -
24.7
1 25.2
24.8
1 25.5
125.2
1 25.5
25.3
/ 25.3
24.8
/ 25.2
25.2
1 25.7
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg1L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp at Receipt ( C)
1
02/14/22
24 hr
69.4
90,1
514
<0.05 1
0.9 1
2
02/16/22
24 hr
75.5
74.0
528
<0.05
0.3
02/18/22
24 hr
77.6
88.9
537
<0.05
0.8
Dilution H2O
Hardness (mg/L)
81.6
Alkalinity (mg/L)
62.3
Conductivity (umhos/cm)
317
Survival
Growth
Normal
no
yes
Horn. Var,
es
es
NOEC
100.0%
100.0%
LOEC
>100.00%
>100.0%
ChV
>100.00%
>100.0%
Method
Steel's Test
T-Test
RWK
3/25122
Overall Result
ChV
Stats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
45%
10.00
16.50
2.41
1.88
65%
10A0
17.00
2.41
2,78
90%
10.00
18.50
2.41
0.82
95%
10.00
17.00
2.41
1,84
100%
10.00
16,50
2.41
0.24
VWQ 1-orm A I-5 (1104) Page 2 of 6

C��doQo����� Flo ��c�op�oQa�c�d
114 OAKMONT DRIVE
GREFNVILLE, N.C. 27858
CITY OF HAVELOCK
MR. JAMES CARTER
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK ,NC 28532
Effluent
Analysis
Method
PARAMETERS
Date Analyst
Code
Ammonia Nitrogen as N, mg/l
0.13
02/03/21
KES
350.1 112-93
Total Kjeldahl Nitrogen as N,mg/I
1.05
02/05/21
TLH
351.2 112-93
Nitrate+Nitrite as N, mg/1
2.75
02/03/21
DTL
353.2 RZ93
Total Phosphorus as P, mg/l
0.42
02/05/21
KES
365.4-74
Oil & Grease (HEM), mg/l
<5.0
02/04/21
KDS
1664B
Phenol, ug/I
TESTED
Total Cyanide, mg/l
<0.005
02/08/21
KDS
4500CNE-11
Total Hardness, mg/l
100
02/08/21
MBS
2340C-11
Total Dissolved Residue, mg/l
260
02/05/21
KDS
D5907-13
Antimony, ug/l
<3.0
02/10/21
NAB
EPA200.8
Arsenic, ug/I
<2.0
02/08/21
MTM
3113B-10
Beryllium, ug/1
<1.0
02/05/21
LFJ
EPA200.7
Cadmium, ug/I
<0.5
02/05/21
MTM
3113B-04
Total Chromium, ug/I
<5.0
02/05/21
LFJ
EPA200.7
Capper, ug/I
4
02/05/21
LFJ
EPA200.7
Lead, ug/1
<2.0
02/05/21
MTM
3113B-10
Nickel, ag/I
<2.0
02/05/21
LFJ
EPA200.7
Selenium, ugh
<1.0
02/11/21
NAB
EPA200.8
Silver, ag/l
<1.0
02/05/21
LFJ
EPA200.7
Thallium, ug/I
<1.0
02/10/21
NAB
EPA200.8
Zinc, ugtI
47
02/05/21
LFJ
EPA200.7
Drinking Wetar Iot 37715
Wastewater ID: 10
.. PAX (252) /56 0633
ID#: 204 H
DATE COLLECTED: 02/02/21
DATE REPORTED : 02/19/21
REVIEWED BY:
NOTE, Any result listed above as "ThSTLD" was sub -contracted to another laboratory. The corresponding results are attached.

Enwomimpo n % hcupwmWo
Drinking Water IDi 37715
Wastewater ID, 10
1 i-1 UAKMON I LAWL KAL ("i)1.) /.'ib G2U;5
GREENVILLE, N.C. 27858 FAX [phone]
CLIENT: CITY OF HAVELOCK CLIENT ID: 204 H
MR. JA14ES CARTER
WASTEWATER TREATMENT PLANT ANALYST: JAP
304 N. JACKSON DRIVE DATE COLLECTED: 02/02/21
HAVELOCK, NC 28532 DATE ANALYZED: 02/03/21
DATE REPORTED: 02/19/21
REVIEWED BY:
VOLATILE ORGANICS
EPA METHOD 624.1
PARAMF,TERS, ug/I
Effluent
1.
Chloromethane
<10.00
2.
Vinyl Chloride
<10.00
3.
Bromomethane
<10.00
4.
Chloroethane
< 10.00
5.
Trichlorofluoromethane
<5.00
6.
1,1-Dichloroethane
<5.00
7.
Methylene Chloride
<10.00
8.
trans-1,2-Dichloroethene
< 5.00
9.
1,1-Dichloroethene
< 5.00
10.
Chloroform
<5.00
11.
1,1,1-Trichloroetbaue
< 5,00
12.
Carbon Tetrachloride
<5.00
13,
Benzene
<5.00
14.
1,2-Dichloroethane
< 5.00
15.
Trichloroethene
<5.00
16.
1,2-Dichloropropane
< 5.00
17.
Bromodichloromethane
<5.00
18.
2-Chloroethylvinyl Ether
< 5.00
19.
cis-1,3-Dichloropropene
<5.00
20.
Toluene
<5.00
21.
trans-1,3-Dichloropropene
< 5.00
22.
1,1,2-Trichloroethane
< 5.00
23.
Telrachloroethene
<5.00
24.
Dibromoebloromethane
<5.00
25.
Cldorobenzene
< 5.00
26.
Ethylbenzene
<5.00
27.
Brorooform
<5.00
28.
1,1,2,2.Tetrachloroethane
< 5.00
29.
1,3-Dichlorobenzene
<5.00
30,
1,4-Dichlorobenzene
<5.00
31.
1,2-Dichlorobenzene
< 5.00
32.
Acrolein
<100.00
33.
Acrylonitrile
<50.00

11- UAKIIAU N I DHiVL
GREENVILLE, N.C. 27858
CLIENT: CITY OF HAVELOCK
MR. JAMES CARTER
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK, NC�2/88532
REVIEWED BY:
SEMIVOLATILE ORGANICS
EPA METHOD 625.1
Drinking Water ID: 17715
Wastewater ID, 1D
iUNL (LL�2) /�6-I 208
FAX [phone]
CLIENT ID: 204 H
ANALYST: JAP
DATE COLLECTED: 02/02/21 Page: 1
DATE EXTRACTED: 02/04/21
DATE ANALYZED: 02/05/21
DATE REPORTED: 02/19/21
PARAMETERS, ug/I
Effluent
1.
N-Nitrosodimethylamine
<10.00
2.
Phenol
<10.00
3.
Bis(2-Chloroethyl) Ether
<10.00
4.
2-Chlorophenyl
< 10.00
5.
1,3-Dichlorobenzene
< 10.00
6.
1,4-Dichlorobenzene
< 10.00
7.
1,2-Dichlorobenzene
< 10.00
8.
Bis(2-Chloro-l-methylethyl) Ether
<10.00
9.
Hexachloroethane
<10.00
10.
N-Nitroso-Di-N-Propylamine
<10.00
11.
Nitrobenzene
< 10.00
12.
Isophorone
< 10.00
13.
2-Nitrophenol
< 10.00
14.
2,4-Dimethylphenol
<10.00
15.
Bis(2-Chloroethoxy) Methane
<10.00
16.
2,4-Dichlorophenol
<10.00
17.
1,2,4-Trichlorobenzene
< 10.00
18,
Naphthalene
<10.00
19.
Hexachlorobutadiene
< 10.00
20.
4-Chloro-3-Methylphenol
<20.00
21.
Hexachlorocyclopentadiene
<10.00
22.
2,4,6-Trichlorophenol
< 10.00
23.
2-Chloronaphthalene
<10.00
24.
Acenaphthyle,e
<10.00
25.
Dimethylphthalate
<10.00
26.
2,6-Dinitrotoluene
<10.00
27.
Acenaphthene
< 10.00
28.
2,4-Dinitrophenol
<50.00
29.
4-Nitrophenol
<50.00
30.
2,4-Dinitrotoluene
< 10.00
31.
Fluorene
< 10.00
32.
Diethylphthalate
< 10.00
33.
4-Chlorophenyl Phenyl Ether
<10.00
34.
4,6-Dinitro-2-Methylphenol
<50.00
35.
N-Nitrosodiphenylamh7e
<10.00
36.
4-Bromophenyl Phenyl Ether
< 10.00
37.
Hexachlorobenzene
<10.00
38.
Pentachlorophenol
< 50.00
39.
Phenanthrene
<10.00
40,
Anthracene
<10.00
41.
Di-N-Butylphthalate
<10.00
42.
Fluoranthene
< 10.00
43.
Benzidine
< 100.00
44.
Pyrene
<10.00
45.
Bnlylbenzylphthlate
<10.00
46.
Benzo(alauthracene
<10.00
47.
3,3'-Dichlorobenzidine
< 10.00
48.
Chrysene
< 10.00

NwhimumM Flo kgoQpumbd
I I,b 0AIQvl0NT DMVE
GREENVILLE, N.C. 27856
�♦ 7� lsFKI 'I.Y
b a 17— t:.r. sar 4
PHONE [phone]
FAX [phone]
CLIENT: CITY OF HAVELOCK CLIENT ID: 204 H
MR. JAMES CARTER
WASTEWATER TREATMENT PLANT ANALYST: JAP
304 N. JACKSON DRIVE DATE COLLECTED: 02/02/21
HAVELOCK, NC 28532 DATE EXTRACTED: 02/04/21
DATE ANALYZED: 02/05/21
REVIEWED BY: _ DATE REPORTED: 02/19/21
SEMIVOLATILE ORGANICS
EPA METHOD 625.1
PARAMETERS, ag/l
Effluent
49.
Bis(2-Ethylhexyl)phthalate
< 20.00
50.
Di-N-Octylphthalate
<10.00
51.
Benzo[b]Baoranthene
< 10.00
52,
Benzo[k]Baoranthene
< 10.00
53.
Benzo(a]pyrene
<10.00
54.
Indeno(1,2,3-C,d)pyrene
< 10.00
55,
Dibenzo[a,h]anthracene
< 10.00
56.
Benzo[g,h,i]perylene
<10.00
57.
1,2-Diphenylhydrazine
< 10.00
Page: 2

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05

114 OAKMONT DRIVE
GREENVILLE. N.C. 27858
CITY OF HAVELOCK
DEVIN ADAMS
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK, NC 28532
Effluent
Analysis
Method
PARAMETERS
Dale Analyst
Code
Ammonia Nitrogen as N, mg/1
0.17
05/31/22
TRJ
350.1 R2-93
Total Kjeldahl Nitrogen as N,mg/I
1.26
06/02/22
TRJ
351.2 R2-93
Nitrate+Nitrite as N, mg/1
2.76
06/01/22
TRJ
353.2 R2-93
Total Phosphorus as P, mg/1
1.43
06/02/22
BMD
365.4-74
00 & Grease (HEM), mg/1
<5.0
05/31/22
BMD
1664B
Phenol, ug/1
TESTED
Total Cyanide, mgfl
<0.005
06/06/22
HMM
450OCNE-16
Total Hardness, mgfl
108
05/31/22
DNS
2340C-11
Total Dissolved Residue, mg/I
410
05/26/22
HMV
D5907-13
Antimony, ug/I
<3.0
06/30/22
NAB
EPA200.8
Arsenic, ugfl
<2.0
06/01/22
MTM
3113B-10
Beryllium, ugfl
<1.0
06/01/22
LFJ
EPA200.7
Cadmium, ugfl
<0.5
05/31/22
MTM
3113B-10
Total Chromium, ug/1
<5.0
06/01/22
LFJ
EPA200.7
Copper, ug/1
5
06/01/22
LFJ
EPA200.7
Lead, ug/l
<2.0
06/03/22
MTM
3113B.10
Nickel, ugfl
2
06/01/22
LFJ
EPA200.7
Selenium, ugfl
<1.0
06/20/22
NAB
EPA200.8
Silver, ugfl
<1.0
06/01/22
LFJ
EPA200.7
Thallium, ugfl
<1.0
06/20/22
NAB
EPA200.8
Zinc, ug/I
41
06/01/22
LFJ
EPA200.7
Drinking Water ID: 37715
Wastewater 11), 10
I iuNE (2oL) 766-6206
FAX [phone]
ID#: 204 H
DATE COLLECTED: 05/25/22
DATE REPORTED : 07/05/22
REVIEWED BY:
NOTE; Any result listed above as "TESTED" was sub -contracted to another laboratory. The corresponding results are attached.

rmIonnum % hCupo MaW
114 OAKIAONT DRIVE
GREENVILLE, N.C. 27356
Drinking Water ID, 37715
Wastewater ID, 30
I-'1-0i, L (262) i:JO 'J2 lV
FAX [phone]
CLIENT: CITY OF HAVELOCK CLIENT ID: 204 H
DEVIN ADAMS
WASTEWATER TREATMENT PLANT ANALYST: JAP
304 N. JACKSON DRIVE DATE COLLECTED: 05/25/22
HAVELOCK, NC j28532 DATE ANALYZED: 05/26/22
REVIEWED 8Y: DATE REPORTED: 07/05/22
�,/./ V�-
VOLATILE ORGANICS
EPA METHOD 624.1
PARAMETERS, ug/1
Effluent
1.
Chloromethane
<10.00
2.
Vinyl Chloride
<10.00
3.
Bromomethane
<10.00
4.
Chloroethane
<10.00
5.
Trichlorofluoromethane
<5.00
6.
1,1-Dichloroethane
< 5.00
7.
Methylene Chloride
<10.00
8,
trans-1,2-Dichloroethene
<5.00
9.
1,1-Dichloroethene
< 5.00
10.
Chloroform
<5.00
11.
1,1,1-Trichloroethane
<5.00
12.
Carbon Tetrachloride
<5.00
13.
Benzene
< 5.00
14.
1,2-Dichloroethane
<5.00
15.
Trichloroethene
<5.00
16.
1,2-Dichloropropane
<5.00
17.
Bromodichloromethane
<5.00
18.
2-Chloroethylvinyl Ether
<5.00
19.
cis-1,3-Dichloropropene
<5.00
20.
Toluene
<5.00
21.
trans-1,3-Dichloropropene
<5.00
22.
1,1,2-Trichloroethane
<5.00
23.
Tetrachloroethene
<5.00
24.
Dibromochloromethane
<5.00
25.
Chlorobenzene
<5.00
26.
Ethylbenzene
<5.00
27.
Bromoform
<5.00
28.
1,1,2,2-Tetrachloroethane
<5.00
29.
1,3-Dichlorobenzene
<5.00
30.
1,4-Dichlorobenzene
<5.00
31.
1,2-Dichlorobenzene
<5.00
32.
Acrolein
<50.00
33.
Acrylonitrile
<50.00

�fiwo mlmgm I hmpumbdo
I t-! 0AKMONT DRIVE
GREENVILLE, N.C. 27856
Drinking Water ID: 37715
Wastewater ID: 10
F I-IUNL ('{ 2) 7-6-62U6
FAX [phone]
CLIENT: CITY OF HAVELOCK CLIENT ID: 204 H
DEVIN ADAMS
WASTEWATER TREATMENT PLANT ANALYST: HIC
304 N. JACKSON DRIVE DATE COLLECTED: 05/25/22
HAVELOCK, NC 28532 DATE EXTRACTED: 06/01/22
f \ DATE ANALYZED: 06/03/22
REVIEWED BY: !�f.,_ DATE REPORTED: 07/05/22
SEMIVOLATILE ORGANICS
EPA METHOD 929-1
PARAMETERS, ug/1
Effluent
1.
N-Nitrosodimethylamhie
<10.00
2.
Phenol
<10.00
3.
Bis(2-Chloroethyl) Ether
<10.00
4.
2-Chlorophenol
<10.00
5.
1,3-Dichlorobenzene
<10.00
6.
1,4-Dichlorobenzene
<10.00
7.
1,2-Dichlorobenzene
<10.00
8.
Bis(2-Cbloro-l-methylethyl) Ether
<10.00
9.
Hexachloroethane
<10.00
10.
N-Nitroso-Di-N-Propylamine
<10.00
11.
Nitrobenzene
<10.00
12.
Isophorone
<10.00
13.
2-Nitrophenol
<10.00
14.
2,4-Dimethylphenol
<10.00
15.
Bis(2-Chloroethoxy) Methane
<10.00
16.
2,4-Dichlorophenol
<10.00
17.
1,2,4-Trichlorobenzene
<10.00
18.
Naphthalene
<10.00
19.
Hexachlorobutadiene
<10.00
20,
4-Chloro-3-Methylphenol
<20.00
21.
Hexachlorocyclopentadiene
<10.00
22.
2,4,6-Trichlorophenol
<10.00
23.
2-Chloronaphthalene
<10.00
24.
Acenaphthylene
<10.00
25.
Dimethylphthalate
<10.00
26.
2,6-Dinitrotohiene
<10.00
27.
Acenaphthene
<10.00
28.
2,4-Dn»trophenol
<50.00
29.
4-Nitrophenol
<50.00
30.
2,4-Dinitrotoluene
<10.00
31.
Fluorene
<10.00
32.
Diethylphthalate
<10.00
33.
4-Chlorophenyl Phenyl Ether
<10.00
34.
4,6-Dinitro-2-Methylphenol
<50.00
35.
N-Nitrosodiphenylamine
<10.00
36.
4-Bromophenyl Phenyl Ether
<10.00
37.
Hexachlorobenzene
<10.00
38.
Pentachlorophenol
<50.00
39.
Phenanthrene
<10.00
40.
Anthracene
<10.00
41.
Di-N-Butylphthalate
<10.00
42.
Fluoranthene
<10.00
43.
Benziduie
<100.00
44.
Pyrene
<10.00
45.
Butylbenzylphthlate
<10.00
46.
Benzo[a]anthracene
<10.00
47.
3,3'-Dichlorobenzidhie
<10.00
48.
Chrysene
<10.00
Page: 1

E ommm(@M t hmpo mod
114 OAKMONT DRIVE
GREENVILLE, N.C. 27858
Drinking Water ID. 37715
Wastewater ID: 10
756-6;::a
FAX [phone]
CLIENT; CITY OF HAVELOCK CLIENT ID: 204 H
DEVIN ADAMS
WASTEWATER TREATMENT PLANT ANALYST: RIC
304 N. JACKSON DRIVE DATE COLLECTED: 05/25/22
HAVELOCK, NC 28532 DATE EXTRACTED: 06/01/22
DATE ANALYZED: 06/03/22
REVIEWED 8Y: DATE REPORTED: 07/05/22
SEMIVOLATILE ORGANICS
EPA METHOD 925-1
PARAMETERS, ug/1
Effluent
49.
Bis(2-Ethylhexyl)phthalate
<20.00
50.
Di-N-Octylphthalate
<10.00
51.
Benzo[b]fluoranthene
<10.00
52.
Benzo[k]fluoranthene
<10.00
53.
Benzo[a]pyrene
<10.00
54.
Indeno(1,2,3-C,d)pyrene
<10.00
55.
Dibenzo[a,h]anthracene
<10.00
56.
Benzo[g,h,i]perylene
<10.00
57.
1,2-Diphenylhydrazine
< 10.00
Page: 2

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aceAnal4ical
WW FIC9lace.com
Laboratory Report
Mark Oliveira
Environment 1
114 Oakmont Dr
Greenville, NC 27858
Pace Analytical Services, LLC
9800 Kincey Ave. Suite 100
Hunterevllle, NC 28078
[phone]
Page 1 of 1
Report Date: 05/31/2022
Date Received: 05/26/2022
Project: Environment 1-City of Havelock
Pace Project No.: 92606507
sample: Effluent -City of Havelock Lab ID: 92606507001 Collected: 05/25/22 00:30 Matrix: Water
Method Parameters Results Units Report Limit Analyzed qualifiers
EPA 420.4 Rev 1.0 1993 Phenolics, Total Recoverable
NO mg/L 0.020 06/31/22 10:54
Reviewed by:
Stephanie Knott
704-977-0981
stephanie.knoft@paoelabs.00m
Pace Analytical services Asheville
2225 Riverside Drive, Asheville, NC 28804 South Carolina Laboratory ID: 99030
Florida/NELAP Certification #: E87648 South Carolina Certification #: 99030001
North Carolina Drinking Water Certification #: 37712 VlrginlaAfELAP Certification #: 460222
North Carolina Wastewater Certification #: 40
Page 1 of 5

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Laboratory receiving samples:
Asheville ❑ Eden ❑ Greenwood ❑ Huntersvllle ❑ Ralelghg Mechanicsville❑ Atlanta❑ Kernersvllie❑
Client Name:
; 7'C I1Mfi/1'4" ProJecw
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77wsa'' ❑•Bubble ge gs �(Nme ❑ Other Biological Tlsavei :ant
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Temp should beabovefreezingto6'C '
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USDA Regulated Soil (;TN/A, water sample) has hagun
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Yes
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Yes
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Yes
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Quaitrax Document ID: 70877 Page 2 of 2
Page 5 of 5
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Quaitrax Document ID: 70877 Page 2 of 2
Page 5 of 5

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Waypointti
ANALYTICAL
114 OAKMONT DRIVE
GREENVILLE, NC 27858
CITY OF HAVELOCK
RODNEY GEORGE
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK, NC 28532
Effluent
Analysis
Method
PARAMETERS
Date
Analyst
Code
Ammonia Nitrogen as N, mg/1
0.08
08/10/23
HMM
350.1 R2-93
Total Neldahl Nitrogen as N,mg/1
0.61
08/11/23
TRJ
351.2 112-93
Nitrate+Nitrite as N, mg/1
2.93
08/07/23
TRJ
353.2 112-93
Total Phosphorus as P, mg/I
1.73
08/11/23
TRJ
365.4-74
Oil & Grease (HEM), mg/l
<5.0
08/03/23
161H
1664B
Phenol, ug/I
TESTED
Total Cyanide, mg/1
<0.005
08/03/23
BLV
450OCNE-16
Total Hardness, mg/l
107
08/07/23
HMV
2340C-11
Total Dissolved Residue, mg/I
1100
08/03/23
BNC
D590743
Antimony, ug/l
<1.0
08/11/23
NAB
EPA200.8
Arsenic, ug/l
<2.0
08/09/23
DRC
31133-10
Beryllium, ug/l
<1.0
08/08/23
MTM
EPA200.7
Cadmium, ug/I
<0.5
08/09/23
DRC
3113B-10
Total Chromium, ug/l
<5.0
08/08/23
MTM
EPA200.7
Copper, ug/l
7
08/08/23
MTM
EPA200.7
Lead, ug/l
<2.0
08/10/23
DRC
3113B-10
Nickel, ug/I
7
08/10/23
MTM
EPA200.7
Selenium, ug/i
<1.0
08/11/23
NAB
EPA200.8
Silver, ug/I
<1.0
08/08/23
MTM
EPA200.7
Thallium, ug/1
<1.0
08/11/23
NAB
EPA200.8
Zinc, ug/I
34
08/08/23
MTM
EPA200.7
Drinking water ID: 37715
waetewatei ID: 10
PHONE [phone]
FAX [phone]
ID#: 204 H
DATE COLLECTED: 08/02/23
DATE REPORTED : 08/15/23
REVIEWED BY:
NOTE: Any result listed above as "TESTED" was sub -contracted to another laboratory. The corresponding results are auxchcd.

Waypointn8
ANALYTICAL
114 OAKMONT DRIVE
GREENVILLE, NC 27858
CLIENT: CITY OF HAVELOCK
RODNEY GEORGE
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK, NC 28532
REVIEWED BY:
VOLATILE ORGANICS
EPA METHOD 624.1
Drinking Water ID: 37715
Wastewater IDS 10
PHONE [phone]
FAX [phone]
CLIENT ID: 204 H
ANALYST: BLD
DATE COLLECTED: 08/02/23
DATE ANALYZED: 08/02/23
DATE REPORTED: 08/15/23
PARAMETERS, ug/I
Effluent
1.
Chloromethane
<10.00
2.
Vinyl Chloride
< 10.00
3.
Bromomethane
<10.00
4.
Chloroethane
< 10.00
S.
TrichloroBuoromethane
<5.00
6.
1,1-Dichloroethane
< 5.00
7.
Methylene Chloride
<10.00
8.
trans-1,2-Dichloroethene
<5.00
9.
1,1-Dichloroethene
<5.00
10.
Chloroform
<5.00
11.
l,l,l-Trichloroethane
< 5.00
12.
Carbon Tetrachloride
<5.00
13.
Benzene
< 5.00
14.
1,2-Dichloroethane
< 5.00
15,
Trichloroethene
<5.00
16.
1,2-Dichloropropane
<5.00
17.
Bromodichloromethane
<5.00
18.
2-Chloroethylvinyl Ether
< 5.00
19.
cis-1,3.Dichloropropene
<5.00
20.
Toluene
<5.00
21.
trans-1,3-Dichloropropene
<5.00
22.
1,1,2-Trichloroethane
< 5.00
23.
Telraebloroethene
< 5.00
24.
Dibromochlurometbane
<5.00
25.
Chlorobenzene
< 5.00
26.
Ethylbenzene
<5.00
27.
Bromoform
<5.00
28,
1,1,2,2-Tetracliloroethane
<5.00
29,
1,3-Dichlorobenzene
<5.00
30.
1,4-Dichlorobenzene
<5.00
31.
192-Dichlorobenzene
<5.00
32.
Acrolein
<50.00
33.
Acrylonitrile
<50.00
NOTE: EPA METHOD 624. 1: Samples received at pH>2.

Waypointn
ANALYTICAL
114 OAKMONT DRIVE
GREENVILLE, NC 27858
CLIENT: CITY OF HAVELOCK
RODNEY GEORGE
WASTEWATER TREATMENT PLANT
304 N. JACKSON DRIVE
HAVELOCK, NC 28532
REVIEWED BY:
SEMIVOLATILE ORGANICS
EPA METHOD 625.1
Drinking Water ID: 37715
wastewater ID, 10
PHONE [phone]
FAX [phone]
CLIENT ID: 204 H
ANALYST: HIC
DATE COLLECTED: 08/02/23
DATE EXTRACTED: 08/08/23
DATE ANALYZED: 08/10/23
DATE REPORTED: 08/15/23
PARAMETERS, ug/I
Effluent
1.
N-Nitrosodimethylamine
< 10.00
2.
Phenol
< 10.00
3.
Bis(2-Chloroethyl) Ether
<10.00
4.
2-Chlorophenyl
< 10.00
5.
1,3-Dichlorobenzene
< 10.00
6.
1,4-151chlorobenzene
< 10.00
7,
1,2-Dichlorobenzene
<10.00
8.
Bis(2-Chloro-l-methylethyl) Ether
<10.00
9.
Hexachloroethane
<10.00
10.
N-Nitroso-Di-N-Piopylamine
< 10.00
11,
Nitrobenzene
<10.00
12.
Isophormie
< 10.00
13.
2-Nitrophenol
< 10.00
14.
2,4-Dimethylphenol
< 10.00
I5.
Bis(2-Chloroethoxy) Methane
<10.00
16,
2,4-Dichlorophenol
<10.00
17.
1,2,4-Trichlorobenzene
< 10.00
18.
Naphthalene
< 10.00
19.
Hexachlorobutadiene
< 10.00
20.
4-Chloro-3-Methylphenol
< 20.00
21.
Hexachlorocyclopentadiene
<10.00
22.
2,4,6-Trichlorophenol
< 10.00
23.
2-Chloronaphthalene
<10.00
24.
Acenaphthylene
<10.00
25.
Dimethylphthalate
<10.00
26.
2,6-Dinitrotoluene
< 10.00
27.
Acenaphthene
<10.00
28,
2,4-Dinitrophenol
<50.00
29.
4-Nitrophenol
<50.00
30.
2,4-Dinitrotoh:ene
< 10.00
31.
Fluorene
< 10.00
32.
Diethylphthalate
< 10.00
33.
4-Chlorophenyl Phenyl Ether
< 10.00
34.
4,6-D nitro-2-Methylphenol
<50.00
35.
N-Nitrosodiphenylmnine
< 10.00
36.
4-13romophenyl Phenyl Ether
<10.00
37.
Hexachlorobenzene
< 10.00
38.
Pentachlorophenol
< 50.00
39.
Phenanthrene
< 10.00
40.
Anthracene
< 10.00
41.
Di-N-Butylphthalate
<10.00
42.
Fluoranthene
< 10.00
43,
Benzidine
<100.00
44.
Pvrene
< 10.00
45.
Butylbenzylphthlate
< 10.00
46,
Benzo[a]mrthracene
<10.00
47.
3,Y-Dichlorobenzidine
< 10.00
48.
Chrysene
< 10,00
Page: 1

0
Waypoint.
ANALYTICAL
114 OAKMONT DRIVE
GREENVILLE, NC 27858
Drinking Water ID: 37715
Wastewater ID: 10
PHONE [phone]
FAX [phone]
CLIENT: CITY OF HAVELOCK CLIENT ID: 204 H
RODNEY GEORGE
WASTEWATER TREATMENT PLANT ANALYST: HIC
304 N. JACKSON DRIVE DATE COLLECTED: 08/02/23
HAVELOCK, NC 28532 DATE EXTRACTED: 08/08/23
DATE ANALYZED: 08/10/23
REVIEWED BY: �— DATE REPORTED: 08/15/23
SEMIVOLATILE ORGANICS
EPA METHOD 625.1
PARAMRTCRS, ug/1
Effluent
49.
Bis(2-Gthylhexyl)phthalate
<20.00
50.
Di-N-Octylphthalate
<10.00
51.
Benzo[b]fluoranthene
< 10.00
52.
Benzo[k]flaoranthene
< 10.00
53.
Benzo[alpyrene
< 10.00
54.
lndeno(1,2,3-C,d)pyrene
< 10.00
55.
Dibenzo[a,hlanthracene
< 10.00
56.
Benzo[g,h,ilperylene
<10.00
57.
1,2-Dipheny1hydrazine
< 10.00
Page: 2

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00435 � aou Ll VS .
0
ypNALYTICAL
waypoint Analytical - Greenville Project
Ann Baynor
114 Oakmont Or Information
Greenville , NC 27858
Report Number:23-216-0019
Lab No: 91595
449 Springbrook Rd, Charlotte, NC 28217
Main 704.529.6364
www.waypointanalytica I.com
City of Havelock
REPORT OF ANAL VSIS
Report Date : 08/14/2023
Received : 08/04/2023
0?X
Jamie Corporaal
Laboratory Project Manager
Sample ID ;Effluent Matrix: Aqueous
Sampled: 8/ 2/ 2023 10:36
Test Results Units MOL DF Date/Time By Analytical
Analyzed Method
Phenols (Total) 0.119 mg/L 0.050 1 08/08/23 11:56 EKF
Qualifiers/ OF Dilution Factor Definitions MQL Method Quantitatlon Limit
420.1
Page 4 of 6

F\U�} 449 Springbrook Rd, Charlotte, NC 28217
V Cd Main 704.529.6364
�u
ANALYT®�FICAL www.waypointanalytical.com
Shipment Receipt Form
Customer Number: 00435
Customer Name: Waypoint Analytical - Greenville
Report Number: 23-216.0019
Shipping Method
Q Fed Ex Q US Postal Q Lab Q Other:
F-- Q UPS Q Client Q courier Thermometer ID: JIRT161.3C
Shipping container/cooler uncompromised? Q Yes Q No
Number of coolers/boxes received (— j
Custody seals intact on shipping container/cooler? Q Yes Q No U Not Present —
Custody seals intact on sample bottles? Q Yes Q No Not Present
Chain of Custody (COC) present? Yes Q No
COC agrees with sample label(s)? Yes Q No
COC properly completed Yes Q No
Samples in proper containers? (7 Yes Q No
Sample containers intact?
(0) Yes
Q No
Sufficient sample volume for indicated test(s)?
* Yes
Q No
All samples received within holding time?
Q Yes
Q No
Cooler temperature in compliance?
Q Yes
Q No
Cooler/Samples arrived at the laboratory on ice.
Samples were considered acceptable as cooling
process had begun.
Q Yes
Q No
Water - Sample containers properly preserved
Yes
Q No Q N/A
Water - VOA vials free of headspace
Q Yes
Q No N/A
Trip Blanks received with VOAs
Q Yes
Q No N/A
Soif VOA method 5035 — compliance criteria met
Q Yes
Q No C4�) N/A
High concentration container (48 hr)
High concentration pre -weighed (methanol -14 d)
F Low concentration Encore samplers (48 hr)
Low cone pre -weighed vials (Sod Bis -14 d)
Special precautions or instructions included?
Comments:
Q Yes Q No
i
Signature: Pngelo Norvell - Date & Time: 08/04/2023 15:34:41
Page 5 of 6

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A
B C D E F I G I H I I I J K L M
N O 1 P
1
NPDES/PT POC Review Form
Version:2022.06.22
2
1. Facility's General Information
3
Date of (draft) Review
5/24/2024
c. POC review due to:
e. Contact Information
4
Date of (final) Review
Municipal NPDES renewal
0
Regional Office (RO)
5
NPDES Permit Writer (pw)
Gary Perlmutter
HWA-AT/LTMP Review
❑
RO PT Staff
RO NPDES Staff
6
Perm ittee- Facility Name
Town of Mooresville - Rocky River WWTP
New Industries
❑
Facility PT Staff, email
7
NPDES Permit Number
NCO046728
WWTP expansion
El
f. Receiving Stream
8
NPDES Permit Effective Date
Stream reclass./adjustment
❑
Outfall 1
9
Chemical Addendum Submittal Date
3/29/2022
Outfall relocation/adjustment
0
Receiving Stream:
QA, cfs:
10
NPDES Permit Public Notice Date
7Q10 update
❑
Stream Class
7Q10 (S), cfs:
11
eDMR data evaluated from:
-T
to
Other POC review trigger, explain:
Oufall Lat.
Outfall Long.
12
a. WWTP Capacity Summary
Outfall II
13
Current Permitted Flow, mgd
7.5
Designed Flow,
m d
7
Receiving Stream:
QA, cfs:
14
Permitted SIU Flow, mgd
0.90
d. IU Summary
Stream Class
7Q10, cfs:
15
b. PT Docs. Summary
# IUs
Oufall Lat.
Outfall Long.
16
L
IWS approval date
1/26/2023
# SIUs
3
Is there a PWS downstream of the Facility's Outfalls?
❑ YES ❑ NO
17
N
'E-L/STMP
approval date:
1/9/2020
# CIUs
0
Comments:
18
E
a
U)
W
HWA approval date
2/26/2019
I
# NSCIUs
19
# IUs w/Local
Permits or Other
ITypes
20
Z
2. Industrial Users' Information.
21
#
Industrial User (IU) Name
IU Activity
IU Non Conventional Pollutans & Toxic Pollutant
IUP Effective Date
22
1
23
2
24
3
25
4
26
5
31
Comment:
32
3. Status of Pretreatment Program (check all that apply)
33
Status of Pretreatment Program (check all that apply)
34
❑
1) facility has no SIUs, does have Division approved Pretreatment Program that is INACTIVE
35
❑
2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program
36
❑
37
❑
I 3a) Full Program with LTMP
38
❑
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
39
❑
40
❑
5) facility's sludge is being land applied or composted
41
❑
6) facility's sludge is incinerated (add Beryllium and Mercury sampling according to § 503.43)
42
❑
7) facility's sludge is taken to a landfill, if yes which landfill:
43
❑
8) other
44
Sludge Disposal Plan:
45
46
47
Sludge Permit No:
WQ0003417
Page 1 46728 POC Review Form 2024

AlB
I C D I E I F I G I H I I I J I K I L I M I N 1 O 1 P
48
4. LTMP/STMP and HWA Review
49
PW: Find L/STMP document, HWA spreadsheet, DMR, previous and new NPDES permit for next section.
50
a
J
c
tU
a
Parameter of Concern
(POC) Check List
New
NPDES
POC
Previous
NPDES
POC
Required by
EPA PT(1)
POC due to
Sludge (2)
POC due to
SIU (3)
POTW
POC (4)
a
/o
Removal
Rate
L/STMP
Effluent Freq
NPDES
Effluent Freq
PQLs review
Comment
51
PQL from
L/STMP, ug/I
Required PQL
per NPDES
permit
Recomm.
PQL, ug/I
52
❑
Flow
❑
❑
❑
❑
53
❑
BOD
Li
❑
❑
❑
54
❑
TSS
❑
❑
❑
❑
55
❑
NH3
❑
❑
❑
❑
56
❑
Arsenic
❑
❑
❑
❑
❑
57
❑
Barium
❑
❑
❑
❑
❑
58
❑
Beryllium(5)
❑
❑
❑
❑
❑
59
❑
Cadmium(1)
❑
❑
❑
❑
❑
❑
0.5
60
❑
Chromium(1)
❑
❑
❑
❑
❑
❑
10.0
61
❑
Copper(1)
❑
❑
❑
❑
❑
❑
2.0
62
❑
Cyanide
❑
❑
❑
❑
❑
63
❑
Lead(1)
❑
❑
❑
❑
❑
❑
2.0
64
❑
Mercury(5)
❑
❑
❑
❑
❑
0.001
65
❑
Molybdenum
❑
❑
❑
❑
❑
10.0
66
❑
Nickel(1)
❑
❑
❑
❑
❑
❑
5.0
67
❑
Selenium
❑
❑
❑
❑
❑
68
❑
Silver
❑
❑
❑
❑
❑
1.0
69
❑
Zinc(1)
❑
❑
❑
❑
❑
❑
70
❑
Sludge Flow to Disposal
❑
❑
❑
71
❑
% Solids to Disposal
❑
❑
❑
72
❑
Oil & Grease
❑
❑
73
❑
TN
❑
❑
❑
❑
74
❑
T P
❑
❑
❑
❑
75
❑
❑
❑
❑
❑
76
❑
❑
❑
❑
❑
77
❑
❑
❑
❑
❑
78
❑
❑
❑
❑
❑
79
❑
❑
❑
❑
❑
80
❑
❑
❑
❑
❑
81
❑
❑
❑
❑
❑
82
Footnotes:
(1) Always in the LTMP/STMP due to EPA -PT requirement
(2) Only in LTMP/STMP if listed in sludge permit
(3) Only in LTMP/STMP while SIU still discharges to POTW
(4) Only in LTMP/STMP when pollutant is still of concern to POTW
(5) In LTMP/STMP, if sewage sludge is incinerated
Please use blue font for the info updated by pw
Please use red font for POC that need to be added/modified in USTMP sampling plan
---;p nr nge font and strikethrough fnr PQC that may be removed from I (STRAP POG list/sampling plan
Blue shaded cell (D60:1-182): Parameters usually included under that POC list
83
84
85
86
87
88
89
90Plp;i,;p
91
92
5. Comments
93
Facility Summary/background information/NPDES-PT regulatory action:
POC to be added/modified in L/STMP:
94
ORC's comments on IU/POC:
95
POC submitted through Chemical
Addendum or Supplemental Chemical
Datasheet:
96
Additional pollutants added to L/STMP due
to POTW s concerns:
97
NPDES pw's comments on IU/POC:
98
6. Pretreatment updates in response to NPDES permit renewal
99
NPDES Permit Effective Date
180 days after effective (date):
7 Permit writer, please add list of required/recommended PT updates in NPDES permit cover letter.
Page 2 46728 POC Review Form 2024

6/5/24, 2:41 PM
NCDEQ-DWR :: Benthos Site Details
NC Division of Water Resources
Benthos Site Details
Waterbody Location
Station ID
Date
Bloclasslflcatlon
DYE CR SR 1147
QB316
11 Sep 2001
Fair
County 8 digit HUG
Latitude
Longitude
Elevation
(ft)
Iredell 03040105
35.537222
-80.794722
732
Level IV Ecoregion Drainage Area (m12) Stream Width (m) Stream Depth (m)
Southern Outer Piedmont 4.0 3.0 0.1
Landuse Percentages
Year Forest Developed Impervious Cultivation Grass/Shrub Wetland Water Barren
2011 0.0 0.0 0.0 0.0 0.0/0.0 0.0 0.0 0.0
2006 0.0 0.0 0.0 0.0 0.0 / 0.0 0.0 0.0 0.0
2001 31.7 50.2 11.7 11.7 5.9 / 0.2 0.3 0.0 0.0
1992 35.3 50.4 14.0 / 0.3 0.0 0.0
Water Quality Parameters 2001 1990 1985
Temperature (°C) 22.0 0.0 0.0
Dissolved Oxygen(mg/L) 7.3 0.0 0.0
Specific Conductance (pS/cm) 130.0 0.0 0.0
pH (s.u.) 7.5 0.0 0.0
Substrate Percentages
2001
1990
1985
Boulder
0
0
0
Cobble
0
5
0
Gravel
10
15
20
Sand
90
80
80
Silt
0
0
0
Other
Habitat Assessment Scores
(max score)
7
Water Clarity
nple Date
;ep 2001
Sample ID
Method ST EPT
BI
6.13
EPT BI
6.00
Bioclassifi,
Fair
8666
Full Scale 44 9
,ep 1990
5437
Full Scale 52 13
6.28
5.48
Fair
Jun 1985
3464
Full Scale 53 14
6.57
5.64 Fair
Print Page
ation
https://www.ncwater.org/?page=672&SitelD=QB316 1/1

MONITORING REPORT(MR) VIOLATIONS for:
Report Date:
07/08/24 Page
1 of 3
Permit:
NCO046728
MRS Betweei 6 - 2019 and 6 - 2024
Region:
%
Violation Category:%
Program Category:
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO046728
FACILITY: Town of Mooresville -Rocky River WWTP
COUNTY: Iredell
REGION: Mooresville
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED
%
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
04 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/17/21
5 X week
mg/I
7.5
9.88
31.7
Weekly Average
Proceed to NOV
Concentration
Exceeded
06 - 2023
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/24/23
5 X week
mg/I
7.5
9.32
24.3
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
04 - 2024
001
Effluent
BOD, 5-Day (20 Deg. C) -
04/30/24
5 X week
mg/I
5
6.19
23.8
Monthly Average
Proceed to NOV
Concentration
Exceeded
05 - 2024
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/04/24
5 X week
mg/I
7.5
13.34
77.9
Weekly Average
None
Concentration
Exceeded
05 - 2024
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/11/24
5 X week
mg/I
7.5
14.4
92
Weekly Average
None
Concentration
Exceeded
05 - 2024
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/18/24
5 X week
mg/I
7.5
16.5
120
Weekly Average
None
Concentration
Exceeded
05 - 2024
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/31 /24
5 X week
mg/I
5
9.6
92.1
Monthly Average
None
Concentration
Exceeded
06 - 2019
001
Effluent
Chlorine, Total Residual
06/18/19
5 X week
ug/I
17
22
29.4
Daily Maximum
No Action, BPJ
Exceeded
08 - 2020
001
Effluent
Chlorine, Total Residual
08/03/20
5 X week
ug/I
17
25
47.1
Daily Maximum
No Action, BPJ
Exceeded
09 - 2020
001
Effluent
Chlorine, Total Residual
09/08/20
5 X week
ug/I
17
26
52.9
Daily Maximum
No Action, BPJ
Exceeded
05-2024
001
Effluent
Coliform, Fecal MF, MFC
05/04/24
5 X week
#/100ml
400
461.33
15.3
Weekly Geometric Mean
None
Broth, 44.5 C
Exceeded
05-2024
001
Effluent
Coliform, Fecal MF, MFC
05/11/24
5 X week
#/100ml
400
4,006.63
901.7
Weekly Geometric Mean
None
Broth, 44.5 C
Exceeded
05-2024
001
Effluent
Coliform, Fecal MF, MFC
05/18/24
5 X week
#/100ml
400
576.4
44.1
Weekly Geometric Mean
None
Broth, 44.5 C
Exceeded
05-2024
001
Effluent
Coliform, Fecal MF, MFC
05/31/24
5 X week
#/100ml
200
241.65
20.8
Monthly Geometric Mean
None
Broth, 44.5 C
Exceeded
05 - 2024
001
Effluent
Nitrogen, Ammonia Total (as
05/11/24
5 X week
mg/I
3
8.26
175.3
Weekly Average
None
N) - Concentration
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 07/08/24 Page
2 of 3
Permit:
NCO046728
MRS Betweel 6 - 2019 and 6 - 2024
Region:
%
Violation Category:%
Program Category: %
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO046728
FACILITY: Town of Mooresville -Rocky River WWTP
COUNTY: Iredell REGION: Mooresville
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE Over VIOLATION TYPE
VIOLATION ACTION
05 - 2024
001
Effluent
Nitrogen, Ammonia Total (as
05/18/24
5 X week
mg/I
3
5.84 94.7 Weekly Average
None
N) - Concentration
Exceeded
05 - 2024
001
Effluent
Nitrogen, Ammonia Total (as
05/31/24
5 X week
mg/I
1
3.72 272 Monthly Average
None
N) - Concentration
Exceeded
Reporting Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE Over VIOLATION TYPE
VIOLATION ACTION
09-2020
001
Upstream
Hardness, Total (as CaCO3)
09/30/20
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
11 -2020
001
Upstream
Hardness, Total (as CaCO3)
11/30/20
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
12-2020
001
Upstream
Hardness, Total (as CaCO3)
12/31/20
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
02-2021
001
Upstream
Hardness, Total (as CaCO3)
02/28/21
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
03-2021
001
Upstream
Hardness, Total (as CaCO3)
03/31/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
05-2021
001
Upstream
Hardness, Total (as CaCO3)
05/31/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
06-2021
001
Upstream
Hardness, Total (as CaCO3)
06/30/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
08-2021
001
Upstream
Hardness, Total (as CaCO3)
08/31/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
09-2021
001
Upstream
Hardness, Total (as CaCO3)
09/30/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
11 -2021
001
Upstream
Hardness, Total (as CaCO3)
11/30/21
Quarterly
mg/I
Sampling Location
None
Missing
12-2021
001
Upstream
Hardness, Total (as CaCO3)
12/31/21
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
02-2022
001
Upstream
Hardness, Total (as CaCO3)
02/28/22
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 07/08/24 Page
3 of 3
Permit:
NCO046728
MRS Betweel 6 - 2019 and 6 - 2024
Region:
%
Violation Category:%
Program Category: %
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO046728
FACILITY: Town of Mooresville -Rocky River WWTP
COUNTY: Iredell REGION: Mooresville
Reporting Violation
MONITORING
REPORT
OUTFALL
LOCATION
PARAMETER
VIOLATION
DATE
FREQUENCY
UNIT OF
MEASURE LIMIT
CALCULATED %
VALUE Over VIOLATION TYPE
VIOLATION ACTION
03-2022
001
Upstream
Hardness, Total (as CaCO3)
03/31/22
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
05-2022
001
Upstream
Hardness, Total (as CaCO3)
05/31/22
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
06-2022
001
Upstream
Hardness, Total (as CaCO3)
06/30/22
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
08-2022
001
Upstream
Hardness, Total (as CaCO3)
08/31/22
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
09-2022
001
Upstream
Hardness, Total (as CaCO3)
09/30/22
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
11 -2022
001
Upstream
Hardness, Total (as CaCO3)
11/30/22
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
12-2022
001
Upstream
Hardness, Total (as CaCO3)
12/31/22
Quarterly
mg/I
Sampling Location
No Action, Invalid
Missing
Permit
02-2023
001
Upstream
Hardness, Total (as CaCO3)
02/28/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
03-2023
001
Upstream
Hardness, Total (as CaCO3)
03/31/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
05-2023
001
Upstream
Hardness, Total (as CaCO3)
05/31/23
Quarterly
mg/I
Sampling Location
None
Missing
06-2023
001
Upstream
Hardness, Total (as CaCO3)
06/30/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
08-2023
001
Upstream
Hardness, Total (as CaCO3)
08/31/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
09-2023
001
Upstream
Hardness, Total (as CaCO3)
09/30/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error
11 -2023
001
Upstream
Hardness, Total (as CaCO3)
11/30/23
Quarterly
mg/I
Sampling Location
No Action, BIMS
Missing
Calculation Error

Whole Effluent Toxicity Testing and Self Monitoring Summary
Moore County WWTP
NCO037508/001
County:
Moore
Ceri7dPF
Begin:
12/1/2010 chr lim: 41%or 50%
NonComp: Single
J
F M
A M
2020
-
- Pass
- -
2021
-
- Pass >100(P)
- -
2022
-
- Pass
- -
2023
-
- Pass
- -
2024
-
- Pass
- -
Mooresville -Rocky River
WWTP
NCO046728/001
County:
Iredell
Ceri7dPF
Begin:
4/1/2014
chr lim: <5.5 MGD @
NonComp: Single
J
F M
A M
2020
-
Pass -
- Pass
2021
-
Pass -
- Pass
2022
-
Pass >100 (P) -
- Pass 76.5 (P)
2023
-
Pass -
- Pass
2024
-
Pass -
- -
Morehead City WWTP
NCO026611/001
County:
Carteret
Mysd24PF
Begin:
4/1/2013
24hr p/f ac lim: 90%
+
NonComp: Single
J
F M
A M
2020
-
Pass -
- Pass
2021
-
Pass -
- Pass
2022
-
Pass -
- Pass
2023
-
Pass -
- Pass
2024
-
Pass -
- Pass
Morganton -Catawba R.
PCF
NCO026573/001
County:
Burke
Ceri7dPF
Begin:
9/1/2022
chr lim: 9.5% @ 8MG
NonComp: Single
J
F M
A M
2020
Pass
- -
Pass -
2021
Pass
>36 (P) >36 (P)
>36 (P) Pass >36 (P)
2022
Pass
- -
Pass -
2023
Pass
- -
Pass -
2024
Pass
- -
Pass -
Motiva Enterprises - South
Charlotte
Ter
NCO046892/001
County:
Mecklenburg
Ceri24PF
Begin:
4/1/2021
Cerio24PF Lim: 90%
NonComp:
J
F M
A M
2020
Pass
- -
Pass -
2021
Pass
- -
Pass -
2022
Pass
- -
Pass -
2023
Pass
- -
Pass -
2024
Pass
- -
Pass -
Region:
FRO
Basin:
LUM50 Mar Jun Sep Dec
SOC JOC:
7Q10:
15.2
PF: 6.7
IWC: 40.54 Freq: Q
J
J
A S
O
N
Pass
-
- >100(P) Pass
-
-
Pass
-
- Pass
-
-
Pass
-
- Pass
-
-
Pass
-
- Pass
-
-
Region:
MRO
Basin:
YAD11 Feb May Aug Nov
SOC JOC:
70,10:
0.5
PF: 5.5
IWC: 94.15 Freq: Q
J
J
A S
O
N
-
-
Pass -
-
Pass
-
-
Pass -
-
Pass >100(P)
-
-
Pass 92.0
-
Pass
-
-
Pass -
-
Pass
Region:
WIRO
Basin:
WOK03 Feb May Aug Nov
SOC JOC:
7Q10:
TIDAL
PF: 1.7
IWC: NA Freq: Q
I
J
A S
O
N
-
-
Pass -
-
Pass
-
-
Pass -
-
Pass
-
-
Pass -
-
Pass
-
-
Pass -
-
Pass
Region:
ARO
Basin:
CTB31 Jan Apr Jul Oct
SOC JOC:
70.10:
118
PF:
IWC: 8.96 Freq: Q
J
I
A S
O
N
-
Pass
- -
Pass
-
-
Pass
- -
Pass
-
-
Pass
- -
Pass
-
-
Pass
- - Pass >36(P)
-
Region:
MRO
Basin:
CTB34 Jan Apr Jul Oct
SOC JOC:
7Q10:
0.0
PF: NA
IWC: 100 Freq: Q
J
J
A S
O
N
Pass
-
Pass
- -
Pass
-
-
Pass
- -
Pass
-
-
Pass
- -
Pass
-
D
Pass
Pass
Pass
Pass
C
G
C
C
Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Solit test between Certified Labs Page 69 of 113

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
PJCHARD E. ROGERS, JR.
Director
Allison Kraft, Public Utilities Director
Town of Mooresville
Post Office Box 878
Mooresville, NC 28115
SUBJECT: Compliance Evaluation Inspection
NORTH CAROLINA
Environmental Quality
February 26, 2024
Town of Mooresville/Rocky River WWTP
NPDES Permit No. NCO046728
Iredell County
Dear Ms. Kraft:
Enclosed is a copy of the Compliance Evaluation Inspection (CEI) Report for the inspection conducted at the subject
facility on February 20, 2024, by Mr. Wes Bell of this Office. This Office would like to thank all of the Town's wastewater
staff for their cooperation and assistance that was provided throughout this inspection. Please advise the facility's Operator -in -
Responsible Charge (ORC) of our findings by forwarding the enclosed report.
Should you have any questions concerning this report, please do not hesitate to contact Mr. Bell at [phone] or at
wes.bellkdeq.nc. gov.
Enclosure: Inspection Report
Cc: NPDES Program Files - Laserfiche
Sincerely,
DocuSigned by:
A HP
F161 F669A2D84A3...
Andrew H. Pitner, P.G.,
Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources, NCDEQ
North Carolina Department of Environmental Quality I Division of Water Resources
Mooresville Regional Office 1 610 East Center Avenue. Suite 301 1 Mooresville, North Carolina28115
704.663.1699

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 1 2 15 I 3 I NCO046728 111 121 24/02/20 I17 18 I r I 19 I G I 201 I
211IIIII IIIIIIIIIII IIIIIII I IIIIII IIIIII�1IIII 166
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
2.0 701Ld J I 71 I„ JI 72 I rL., I 73�I74 79 I I I I I I 180
J
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
09:30AM 24/02/20
19/11/01
Rocky River WWTP
369 Johnson Dairy Rd
Exit Time/Date
Permit Expiration Date
Mooresville NC 28115
01:30PM 24/02/20
24/03/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
James Levis/ORC/704-662-8341/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Jim Landon,PO Box 878 Mooresville NC 28115/Interim Town Manager/704-662-3188/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit 0 Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran 0 Sludge Handling Dispo: Facility Site Review Effluent/Receiving Wate
Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Wes Bell Signed by: DWR/MRO WQ/704-235-2192/ 2/26/2024
�r.&
E�D`1696DMCC3437—
Signature of MarFgmPmmIsQnA0Rvviewer Agency/Office/Phone and Fax Numbers Date
Andrew Pitn LrA4-� H P441!ANR/MRO WQ/704-663-1699 Ext.2180/ 2/26/2024
F161FB69A2D84A3...
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NC0046728 I11 12I 24/02/20 117 18 ICI
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
On -site Representatives:
The following Town of Mooresville staff were in attendance during the inspection: Mr. Jamie Levis, Mr.
Jerry Lyman and Mr. Tony Fritz.
Page#

Permit: NCO046728 Owner -Facility: Rocky River WWTP
Inspection Date: 02/20/2024 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
0
❑
❑
❑
application?
Is the facility as described in the permit?
0
❑
❑
❑
# Are there any special conditions for the permit?
0
❑
❑
❑
Is access to the plant site restricted to the general public?
0
❑
❑
❑
Is the inspector granted access to all areas for inspection?
0
❑
❑
❑
Comment: The Division received the Town's permit renewal package on 10/3/23.
The Town implements a Division -approved Industrial Pretreatment Program.
The last compliance evaluation inspection at this facility was performed by DWR staff
on 3/1/22.
Record Keeping
Are records kept and maintained as required by the permit?
Is all required information readily available, complete and current?
Are all records maintained for 3 years (lab. reg. required 5 years)?
Are analytical results consistent with data reported on DMRs?
Is the chain -of -custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
Transported COCs
Are DMRs complete: do they include all permit parameters?
Has the facility submitted its annual compliance report to users and DWQ?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified
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?
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Page# 3

Permit: NCO046728
Inspection Date: 02/20/2024
Owner -Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Comment: The records reviewed during the inspection were organized and well maintained.
Discharge Monitoring Reports (eDMRs) were reviewed for the period January 2023
through December 2023. A weekly average effluent BOD violation was reported in
June 2023. The Division has previously addressed this limit violation through the
issuance of a Notice of Violation (NOV)/civil penalty assessment. In-depth operation &
maintenance records (including process control measurements) were being maintained
on -site.
Laboratory
Yes
No
NA NE
Are field parameters performed by certified personnel or laboratory?
■
❑
❑ ❑
Are all other parameters(excluding field parameters) performed by a certified lab?
0
❑
❑ ❑
# Is the facility using a contract lab?
0
❑
❑ ❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
0
❑
❑ ❑
degrees Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
❑
❑
❑ ■
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
❑
❑
❑ ■
Comment: Influent and effluent analyses (including field) are performed under the Town's on -site
certified laboratory certification (#173). Pace Analytical Services and Waypoint
Analytical have also been contracted to provide analytical support. The facility
staff
must ensure that the model and serial numbers for the dissolved oxygen and
pH
meters are documented on the calibration and field measurement logs.
Influent Sampling
Yes
No
NA
NE
# Is composite sampling flow proportional?
0
❑
❑
❑
Is sample collected above side streams?
0
❑
❑
❑
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
0
❑
❑
❑
degrees Celsius)?
Is sampling performed according to the permit?
0
❑
❑
❑
Comment: The subject permit requires influent composite BOD and TSS samples. Sampler
aliquot calibrations/verifications are adequately
performed (and documented).
Effluent Sampling
Yes
No
NA NE
Is composite sampling flow proportional?
0
❑
❑
❑
Is sample collected below all treatment units?
0
❑
❑
❑
Is proper volume collected?
0
❑
❑
❑
Is the tubing clean?
0
❑
❑
❑
Page# 4

Permit: NCO046728 Owner -Facility: Rocky River WWTP
Inspection Date: 02/20/2024 Inspection Type: Compliance Evaluation
Effluent Sampling Yes No NA NE
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 0 ❑ ❑ ❑
degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type 0 ❑ ❑ ❑
representative)?
Comment: The subject permit requires composite and grab effluent samples. Sampler aliquot
calibrations/verifications are adequately performed (and documented).
The facility staff must ensure that oil & grease samples (influent and effluent) are
collected directly into the sample container (no intermediate containers) during future
sampling events.
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, ■ ❑ ❑ ❑
and sampling location)?
Comment: The Division has conditionally waived the instream monitorinq requirements due to the
Town's continued membership in the Yadkin -Pee Dee River Basin Association. Note:
The facility staff do perform the quarterly upstream hardness sampling.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: The wastewater treatment facility appeared to be properly operated and well
maintained. The facility staff incorporate an in-depth process control program. The
facility is equipped with a SCADA system to assist the wastewater staff in alarm
notifications and treatment operations.
Equalization Basins
Yes
No
NA NE
Is the basin aerated?
0
❑
❑
❑
Is the basin free of bypass lines or structures to the natural environment?
0
❑
❑
❑
Is the basin free of excessive grease?
0
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
0
❑
❑
❑
Are float controls operable?
0
❑
❑
❑
Are audible and visual alarms operable?
❑
❑
0
❑
# Is basin size/volume adequate?
❑
❑
❑
Comment: The facility is equipped with dual one MG equalization tanks.
Pump Station - Influent Yes No NA NE
Is the pump wet well free of bypass lines or structures? 0 ❑ ❑ ❑
Page# 5

Permit: NC0046728 Owner -Facility: Rocky River WWTP
Inspection Date: 02/20/2024 Inspection Type: Compliance Evaluation
Pump Station - Influent Yes No NA NE
Is the wet well free of excessive grease?
0
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
0
❑
❑
❑
Are float controls operable?
0
❑
❑
❑
Is SCADA telemetry available and operational?
0
❑
❑
❑
Is audible and visual alarm available and operational?
❑
❑
0
❑
Comment:
Bar Screens
Yes
No
NA
NE
Type of bar screen
a.Manual
❑
b.Mechanical
Are the bars adequately screening debris?
0
❑
❑
❑
Is the screen free of excessive debris?
■
❑
❑
❑
Is disposal of screening in compliance?
■
❑
❑
❑
Is the unit in good condition?
E
❑
❑
❑
Comment: Screenings and grit are disposed by Republic Services at the CMS Landfill.
Chemical Feed
Yes
No
NA NE
Is containment adequate?
0
❑
❑ ❑
Is storage adequate?
0
❑
❑ ❑
Are backup pumps available?
S
❑
❑ ❑
Is the site free of excessive leaking?
■
❑
❑ ❑
Comment: Sodium hydroxide is added to maintain appropriate alkalinity/pH levels.
Aeration Basins
Yes
No
NA NE
Mode of operation
Ext. Air
Type of aeration system
Diffused
Is the basin free of dead spots?
0
❑
❑
❑
Are surface aerators and mixers operational?
0
❑
❑
❑
Are the diffusers operational?
0
❑
❑
❑
Is the foam the proper color for the treatment process?
E
❑
❑
❑
Does the foam cover less than 25% of the basin's surface?
E
❑
❑
❑
Page# 6

Permit: NCO046728
Inspection Date: 02/20/2024
Aeration Basins
Is the DO level acceptable?
Is the DO level acceptable?(1.0 to 3.0 mg/1)
Owner -Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Comment: The traditional plant is equipped with surface aeration and the package plants (1 MGD
each) are equipped with diffused (fine bubble) aeration.
Secondary Clarifier
Is the clarifier free of black and odorous wastewater?
Is the site free of excessive buildup of solids in center well of circular clarifier?
Are weirs level?
Is the site free of weir blockage?
Is the site free of evidence of short-circuiting?
Is scum removal adequate?
Is the site free of excessive floating sludge?
Is the drive unit operational?
Is the return rate acceptable (low turbulence)?
Is the overflow clear of excessive solids/pin floc?
Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth)
Yes
No
NA NE
■
❑
❑
❑
■
❑
❑
❑
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
❑
❑
❑
■
❑
❑
❑
•
❑
❑
❑
•
❑
❑
❑
❑
❑
■
❑
Comment: The facility is equipped with a total of four (4) secondary clarifiers (2-traditional plant
and 2-package plant).
Pumps-RAS-WAS
Yes
No
NA NE
Are pumps in place?
0
❑
❑ ❑
Are pumps operational?
0
❑
❑ ❑
Are there adequate spare parts and supplies on site?
0
❑
❑ ❑
Comment:
Filtration (High Rate Tertiary)
Type of operation:
Is the filter media present?
Is the filter surface free of clogging?
Is the filter free of growth?
Is the air scour operational?
Is the scouring acceptable?
Is the clear well free of excessive solids and filter media?
Yes No NA NE
Cross flow
❑ ❑ ❑
■ ❑ ❑ ❑
❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Page# 7

Permit: NC0046728
Inspection Date: 02/20/2024
Filtration (High Rate Tertiary)
Owner -Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Comment: The effluent from all four secondary clarifiers is combined prior to the disc -media type
filtration system.
Disinfection - UV
Are extra UV bulbs available on site?
Are UV bulbs clean?
Is UV intensity adequate?
Is transmittance at or above designed level?
Is there a backup system on site?
Is effluent clear and free of solids?
Comment:
Flow Measurement- Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
❑
❑
■
❑
Comment: The flow meters (influent and effluent) are calibrated twice per vear and were last
calibrated on 1/4/24 by Carolina Technical Services, Inc.
Effluent Pipe
Yes
No
NA
NE
Is right of way to the outfall properly maintained?
0
❑
❑
❑
Are the receiving water free of foam other than trace amounts and other debris?
0
❑
❑
❑
If effluent (diffuser pipes are required) are they operating properly?
❑
❑
0
❑
Comment: The effluent appeared clear with trace suspended solids and no foam. The receiving
stream did not appear to be negatively impacted.
Aerobic Digester
Is the capacity adequate?
Is the mixing adequate?
Is the site free of excessive foaming in the tank?
# Is the odor acceptable?
# Is tankage available for properly waste sludge?
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Page# 8

Permit: NC0046728
Inspection Date: 02/20/2024
Owner -Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Aerobic Digester Yes No NA NE
Comment: Both aerobic digesters (aerated sludge holding tanks) were operational and in service.
The facility staff are planning on repairing an air leak in the piping system for the
digesters within the near future.
Solids Handling Equipment
Is the equipment operational?
Is the chemical feed equipment operational?
Is storage adequate?
Is the site free of high level of solids in filtrate from filter presses or vacuum filters?
Is the site free of sludge buildup on belts and/or rollers of filter press?
Is the site free of excessive moisture in belt filter press sludge cake?
The facility has an approved sludge management plan?
Yes
No
NA NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Comment: The belt press was operational and in service. The drver system was not in service
due to ongoing maintenance. Dewatered bio-solids are either land applied as a Class
A product to local farmers or transported to a permitted landfill as a Class B sludge.
The facility staff must ensure adequate housekeeping is performed around the dryer
building to prevent dewatered sludge from entering the adjacent stormwater drainage
system.
Standby Power
Is automatically activated standby power available?
Is the generator tested by interrupting primary power source?
Is the generator tested under load?
Was generator tested & operational during the inspection?
Do the generator(s) have adequate capacity to operate the entire wastewater site?
Is there an emergency agreement with a fuel vendor for extended run on back-up
power?
Is the generator fuel level monitored?
Yes No NA NE
■ ❑ ❑ ❑
M ❑ ❑ ❑
M ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Comment: The facility is equipped with four backup generators (3 - main plant and 1 —
equalization tanks). Two generators are required to power the main plant. The
generators are tested (automatically) under a simulated load monthly and serviced
quarterly by Power Generation & Control.
Page# 9

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 2 u 3 I NC0046728 111 121 24/02/23 I17 18 L D I 19 I s I 201
211IIIII 111111III II III III1 I I IIIII IIIIIIIII II r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
2.0 70Id I 71 I„ I 72 r., 71 I 74 79 I I I I I I I80
L—I ty L-1 I I
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
09:30AM 24/02/23
19/11/01
Rocky River WWTP
369 Johnson Dairy Rd
Exit Time/Date
Permit Expiration Date
Mooresville NC 28115
01:05PM 24/02/23
24/03/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Jeffrey C Campbell///
Lane Dale Cory///
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
James A Levis, PO Box 878 Mooresville NC 281150878/WWTP Manag er/704-662-8470,
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Pretreatment
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Wes Bell DWR/MRO WQ/704-235-2192/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NCO046728 I11 12I 24/02/23 117 18 1 p I
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
The Town currently has 2 SIUs with no CIUs. An additional SIU dropped in November 2023. All SIUs
were inspected and sampled in 2023. No SIUs were in SNC for 2023
The records reviewed during the inspection were organized and well maintained. The Town's
Industrial Pretreatment Program was being properly implemented.
Page#

Permit: NC0046728
Inspection Date: 02/23/2024
Owner -Facility: Rocky River WWTP
Inspection Type: Pretreatment Compliance
Yes No NA NE
Page#

NH3/TRC WLA Calculations
Town of Mooresville - Rocky River WWTP
Permit No. NC0046728
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 7.5
Enter s7Q10 (cfs): 0.5
Enter w7Q10 (cfs): 0.9
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/l)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/l)
s7Q10 (CFS)
0.5
s7Q10 (CFS)
0.5
DESIGN FLOW (MGD)
7.5
DESIGN FLOW (MGD)
7.5
DESIGN FLOW (CFS)
11.625
DESIGN FLOW (CFS)
11.625
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/l)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
95.88
IWC (%)
95.88
Allowable Conc. (ug/l)
18
Allowable Conc. (mg/l)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/l)
Fecal Coliform
w7Q10 (CFS)
0.9
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
7.5
(If DF>331; Monitor)
DESIGN FLOW (CFS)
11.625
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.04 Upstream Bkgd (mg/1)
0.22
IWC (%)
92.81
Allowable Conc. (mg/l)
1.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/l to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/l
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/l
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

Facility Name
WWTP/WTP Class
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQS
Rocky River WWTP
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ Apply WS Hardness WQC
Lentic or Lotic
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1 Q10s (cfs)
Effluent Hardness
. Upstream Hardness
Combined Hardness Chronic
--------------
Combined Hardness Acute
Data Source(s)
❑ CHECK TO APPLY MODEL
Grade IV
NCO046728
001
7.500
Dye Creek
03040105
C
Lotic
0.50
0.90
1.10
5.00
0.42
80.03 mg/L (Avg)
36.77 mg/L (Avg)
--------------------
78.25 mg/L
-------- 78.53 mg/L --
Data from submitted DMRs and Effluent Pollutant
Scans.
Par01
Par02
Par03
Par04
Par05
Par06E
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
Table 2. Parameters of Concern
Name WQs Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Trout
NC
2.3657
TR
5.6675
ug/L
Chlorides
Aquatic Life
NC
230
FW
mg/L
Chlorinated Phenolic Compounds
Water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
299.7435
FW
2310.9537
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
lag/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
lag/L
Copper
Aquatic Life
NC
20.8933
FW
30.7873
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
10.4674
FW
269.6477
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
97.7556
FW
882.7540
lag/L
Nickel
Water Supply
NC
25.0000
WS
N/A
lag/L
Selenium
Aquatic Life
NC
3.1
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
2.1225
ug/L
Zinc
Aquatic Life
NC
333.2488
FW
331.5308
ug/L
46728 Freshwater RPA 2024, input
9/11 /2024

REASONABLE POTENTIAL ANALYSIS
H1
I Effluent Hardness I
Date
1 9/10/2019
2 10/8/2019
3 11 /5/2019
4 12/10/2019
5 1 /15/2020
6 2/11 /2020
7 4/7/2020
8 7/14/2020
9 10/13/2020
10 1 /12/2021
11 4/27/2021
12 7/13/2021
13 10/12/2021
14 1 /11 /2022
15 4/12/2022
16 7/19/2022
17 10/11 /2022
18 1 /17/2023
19 4/4/2023
20 7/11 /2023
21 10/10/2023
22 1 /23/2024
23 4/23/2024
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Data
BDL=1/2DL
Results
76.3
76.3
Std Dev.
87.9
87.9
Mean
88.6
88.6
C.V.
94.3
94.3
n
79.6
79.6
10th Per value
60.7
60.7
Average Value
63.6
63.6
Max. Value
67.9
67.9
57.3
57.3
49
49
87.5
87.5
66.4
66.4
79.8
79.8
66.8
66.8
77.7
77.7
99.5
99.5
88.1
88.1
101
101
107
107
76.4
76.4
84.5
84.5
76.9
76.9
104
104
Use "PASTE SPECIAL-
IH2
Values" then "COPY".
Maximum data points
= 58
15.4836
80.0348
0.1935
23
61.28 mg/L
80.03 mg/L
107.00 mg/L
Date
1 11 /5/2019
2 12/10/2019
3 1 /15/2020
4 2/11/2020
5 4/7/2020
6 7/14/2020
7 10/13/2020
8 1 /12/2021
9 4/27/2021
10 7/13/2021
11 10/12/2021
12 1 /11 /2022
13 4/12/2022
14 7/19/2022
15 10/11 /2022
16 1 /17/2023
17 4/4/2023
18 7/11 /2023
19 10/10/2023
20 1 /23/2024
21 4/23/2024
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Upstream
Hardness
Values" then "COPY".
Maximum data points
= 58
Data
BDL=1/2DL
Results
33.1
33.1
Std Dev.
8.0888
38.3
38.3
Mean
36.7667
26.6
26.6
C.V.
0.2200
18.3
18.3
n
21
35.4
35.4
10th Per value
29.70 mg/L
33.6
33.6
Average Value
36.77 mg/L
34.4
34.4
Max. Value
54.70 mg/L
31.5
31.5
34.2
34.2
33.5
33.5
37.2
37.2
29.7
29.7
54.7
54.7
48.9
48.9
42
42
37.2
37.2
37.7
37.7
36.8
36.8
50.2
50.2
34.7
34.7
44.1
44.1
46728 Freshwater RPA 2024, data
-2- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Date Data
1 10/8/2019 <
2 11 /5/2019 <
3 12/10/2019 <
4 1 /15/2020
5 4/7/2020
6 7/14/2020
7 10/13/2020
8 1 /12/2021
9 4/27/2021 <
10 7/13/2021 <
11 10/12/2021 <
12 1 /11 /2022 <
13 4/12/2022 <
14 7/19/2022 <
15 10/11 /2022 <
16 1 /17/2023 <
17 4/4/2023 <
18 7/11 /2023 <
19 10/10/2023 <
20 1 /23/2024 <
21 4/23/2024 <
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
Par03
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Arsenic
Values" then "COPY".
Beryllium
Values" then "COPY".
Maximum data points
Maximum data points
= 58
= 58
BDL=1/2DL
Results
Date Data
BDL=1/2DL Results
10
5
Std Dev.
1.0253
1
Std Dev.
NO DATA
2
1
Mean
0.6376
2
Mean
NO DATA
2
1
C.V.
1.6079
3
C.V.
NO DATA
0.29
0.29
n
21
4
n
0
0.18
0.18
5
0.39
0.39
Mult Factor =
1.82
6
Mult Factor =
N/A
0.38
0.38
Max. Value
5.0 ug/L
7
Max. Value
N/A ug/L
0.15
0.15
Max. Pred Cw
9.1 ug/L
8
Max. Pred Cw
N/A ug/L
1
0.5
9
1
0.5
10
1
0.5
11
1
0.5
12
1
0.5
13
0.5
0.25
14
1
0.5
15
0.5
0.25
16
0.5
0.25
17
1
0.5
18
0.5
0.25
19
0.5
0.25
20
0.5
0.25
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
46728 Freshwater RPA 2024, data
-3- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par04
Cadmium
Date
Data
BDL=1/2DL
Results
1
10/8/2019
<
1
0.5
Std Dev.
2
11/5/2019
<
0.5
0.25
Mean
3
12/10/2019
<
0.5
0.25
C.V.
4
1 /15/2020
<
0.1
0.05
n
5
4/7/2020
<
0.1
0.05
6
7/14/2020
<
0.1
0.05
Mult Factor =
7
10/13/2020
<
0.1
0.05
Max. Value
8
1/12/2021
<
0.1
0.05
Max. Pred Cw
9
4/27/2021
<
0.2
0.1
10
7/13/2021
<
0.2
0.1
11
10/12/2021
<
0.2
0.1
12
1 /11 /2022
<
0.2
0.1
13
4/12/2022
<
0.2
0.1
14
7/19/2022
<
0.1
0.05
15
10/11 /2022
<
0.5
0.25
16
1 /17/2023
<
0.1
0.05
17
4/4/2023
<
0.1
0.05
18
7/11 /2023
<
0.2
0.1
19
10/10/2023
<
0.1
0.05
20
1 /23/2024
<
0.1
0.05
21
4/23/2024
<
0.1
0.05
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL-
Par05
Values" then "COPY".
Maximum data points
= 58
0.1120 1
0.1143 2
0.9797 3
21 4
5
1.55 6
0.500 ug/L 7
0.775 ug/L 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Chlorides
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY".
Maximum data points = 58
NO DATA
NO DATA
NO DATA
0
N/A
N/A mg/L
N/A mg/L
46728 Freshwater RPA 2024, data
-4- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par06
Chlorinated Phenolic Compounds
Use "PASTE SPECIAL -
Values" then "COPY".
Par07
Total Phenolic Compounds
Maximum data points
= 58
Date Data BDL=1/2DL Results
Date
Data BDL=1/2DL
Results
1
Std Dev.
NO DATA
1
7/26/2021
224 224
Std Dev.
2
Mean
NO DATA
2
10/24/2022
< 50 25
Mean
3
C.V.
NO DATA
3
1/30/2023
192 192
C.V. (default)
4
n
0
4
n
5
5
6
Mult Factor =
N/A
6
Mult Factor =
7
Max. Value
N/A ug/L
7
Max. Value
8
Max. Pred Cw
N/A ug/L
8
Max. Pred Cw
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
Use "PASTE SPECIAL -
Values" then "COPY".
Maximum data points
= 58
106.8597
147.0000
0.6000
3
3.00
224.0 ug/L
672.0 ug/L
46728 Freshwater RPA 2024, data
-5- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
46728 Freshwater RPA 2024, data
9/11 /2024

REASONABLE POTENTIAL ANALYSIS
Par10
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
Chromium, Total
Date
Data
BDL=1/2DL
Results
10/8/2019
<
5
2.5
Std Dev.
11/5/2019
<
5
2.5
Mean
12/10/2019
<
5
2.5
C.V.
1 /15/2020
<
0.5
0.25
n
4/7/2020
<
0.5
0.25
7/14/2020
<
0.5
0.25
Mult Factor =
10/13/2020
<
0.5
0.25
Max. Value
1/12/2021
0.75
0.75
Max. Pred Cw
4/27/2021
<
1
0.5
7/13/2021
<
1
0.5
10/12/2021
<
1
0.5
1 /11 /2022
<
1
0.5
4/12/2022
<
1
0.5
7/19/2022
<
2
1
10/11 /2022
<
1
0.5
1 /17/2023
<
2
1
4/4/2023
<
2
1
7/11 /2023
<
1
0.5
10/10/2023
<
2
1
1 /23/2024
<
2
1
4/23/2024
<
2
1
Pall
Use "PASTE SPECIAL -
Values" then "COPY".
Maximum data points
= 58
0.7270
0.8929
0.8143
21
1.46
2.5 tag/L
3.7 tag/L
Use "PASTE SPECIAL -
Copper Values" then "COPY".
Maximum data points
--58
Date Data
BDL=1/2DL
Results
1
10/8/2019
6.4
6.4
Std Dev.
2
11/5/2019
2.8
2.8
Mean
3
12/10/2019
6.1
6.1
C.V.
4
1 /15/2020
3.7
3.7
n
5
2/11/2020
3.8
3.8
6
3/10/2020
3.9
3.9
Mult Factor =
7
4/7/2020
3.5
3.5
Max. Value
8
5/5/2020
4
4
Max. Pred Cw
9
6/9/2020
2.9
2.9
10
7/14/2020
3.3
3.3
11
8/11/2020
6.7
6.7
12
9/15/2020
4
4
13
10/13/2020
5.5
5.5
14
11/17/2020
3.6
3.6
15
12/8/2020
3.8
3.8
16
1 /12/2021
4.3
4.3
17
2/9/2021
2.2
2.2
18
3/9/2021
3
3
19
4/27/2021
3.8
3.8
20
5/18/2021
4.7
4.7
21
6/9/2021
4.1
4.1
22
7/13/2021
7
7
23
8/10/2021
4.2
4.2
24
9/7/2021
4.3
4.3
25
10/12/2021
4
4
26
11/16/2021
4.7
4.7
27
12/7/2021
5.4
5.4
28
1 /11 /2022
3.1
3.1
29
2/8/2022
3.4
3.4
30
3/15/2022
3.1
3.1
31
4/12/2022
3.7
3.7
32
5/10/2022
12.9
12.9
33
6/14/2022
5.6
5.6
34
7/19/2022
5.5
5.5
35
8/17/2022
5.1
5.1
36
9/6/2022
7.9
7.9
37
10/11/2022
5.4
5.4
38
11/15/2022
4.8
4.8
39
12/6/2022
6.17
6.17
40
1 /17/2023
3.5
3.5
41
2/7/2023
2.5
2.5
42
3/7/2023
4.1
4.1
43
4/4/2023
3.8
3.8
44
5/9/2023
3.7
3.7
45
6/6/2023
2.9
2.9
46
7/11/2023
4.3
4.3
47
8/15/2023
2.8
2.8
48
9/11/2023
4.1
4.1
49
10/10/2023
3
3
50
11 /7/2023
3.5
3.5
51
12/5/2023
3.5
3.5
52
1 /23/2024
5
5
53
2/13/2024
2.7
2.7
54
3/6/2024
4.4
4.4
55
4/23/2024
2.2
2.2
56
5/7/2024
3.4
3.4
57
58
1.6917
4.3173
0.3919
56
1.01
12.90 ug/L
13.03 ug/L
46728 Freshwater RPA 2024, data
-7- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par12
Date Data
1 9/10/2019 <
2 10/8/2019 <
3 1 /15/2020 <
4 4/7/2020 <
5 7/14/2020 <
6 10/13/2020 <
7 1 /12/2021 <
8 4/27/2021 <
9 7/13/2021 <
10 10/12/2021 <
11 1 /11 /2022 <
12 4/12/2022 <
13 7/19/2022 <
14 10/11 /2022 <
15 1/17/2023 <
16 4/4/2023 <
17 7/11/2023 <
18 10/10/2023 <
19 1 /23/2024 <
20 4/23/2024 <
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
Par13
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Cyanide
Values" then "COPY".
Fluoride
Values" then "COPY".
Maximum data points
Maximum data points
= 58
= 58
BDL=1/2DL
Results
Date Data
BDL=1/2DL Results
8
5
Std Dev.
0.0000
1
Std Dev.
NO DATA
8
5
Mean
5.00
2
Mean
NO DATA
8
5
C.V.
0.0000
3
C.V.
NO DATA
8
5
n
20
4
n
0
8
5
5
8
5
Mult Factor =
1.00
6
Mult Factor =
N/A
8
5
Max. Value
5.0 ug/L
7
Max. Value
N/A ug/L
8
5
Max. Pred Cw
5.0 ug/L
8
Max. Pred Cw
N/A ug/L
7
5
9
8
5
10
8
5
11
8
5
12
10
5
13
8
5
14
8
5
15
8
5
16
8
5
17
8
5
18
8
5
19
8
5
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
46728 Freshwater RPA 2024, data
-8- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par14
Date
1 10/8/2019 <
2 11 /5/2019 <
3 12/10/2019 <
4 1 /15/2020
5 4/7/2020
6 7/14/2020
7 10/13/2020
8 1 /12/2021
9 4/27/2021 <
10 7/13/2021 <
11 10/12/2021 <
12 1 /11 /2022 <
13 4/12/2022 <
14 7/19/2022 <
15 10/11 /2022 <
16 1 /17/2023 <
17 4/4/2023 <
18 7/11 /2023 <
19 10/10/2023 <
20 1 /23/2024 <
21 4/23/2024 <
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
Par15
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Lead
Values" then "COPY".
Mercury
Values" then "COPY".
Maximum data points
Maximum data points
= 58
= 58
BDL=1/2DL
Results
Date Data
BDL=1/2DL Results
5
2.5
Std Dev.
0.5295
1
Std Dev.
NO DATA
2
1
Mean
0.5286
2
Mean
NO DATA
2
1
C.V.
1.0017
3
C.V.
NO DATA
0.25
0.25
n
21
4
n
0
0.23
0.23
5
0.13
0.13
Mult Factor =
1.56
6
Mult Factor =
N/A
0.11
0.11
Max. Value
2.500 ug/L
7
Max. Value
N/A ng/L
0.13
0.13
Max. Pred Cw
3.900 ug/L
8
Max. Pred Cw
N/A ng/L
1
0.5
9
1
0.5
10
1
0.5
11
1
0.5
12
1
0.5
13
0.5
0.25
14
1
0.5
15
0.5
0.25
16
2
1
17
1
0.5
18
0.5
0.25
19
0.5
0.25
20
0.5
0.25
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
46728 Freshwater RPA 2024, data
-9- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par16
Par17 & Par18
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Molybdenum
Values" then "COPY".
Nickel
Values" then "COPY".
Maximum data points
Maximum data points
= 58
= 58
Date Data
BDL=1/2DL
Results
Date Data
BDL=1/2DL
Results
1
10/8/2019
18.4
18.4
Std Dev.
14.0619
1
10/8/2019 <
5
2.5
Std Dev.
0.4284
2
11/5/2019
6.2
6.2
Mean
16.8571
2
11/5/2019 <
2
1
Mean
1.3633
3
12/10/2019
7.6
7.6
C.V.
0.8342
3
12/10/2019 <
2
1
C.V.
0.3142
4
1 /15/2020
4.8
4.8
n
21
4
1 /15/2020
0.85
0.85
n
21
5
4/7/2020
12
12
5
4/7/2020
1.1
1.1
6
7/14/2020
6
6
Mult Factor =
1.47
6
7/14/2020
1.5
1.5
Mult Factor =
1.18
7
10/13/2020
6.3
6.3
Max. Value
52.7 ug/L
7
10/13/2020
1.8
1.8
Max. Value
2.5 tag/L
8
1/12/2021
21.1
21.1
Max. Pred Cw
77.5 ug/L
8
1/12/2021
1.7
1.7
Max. Pred Cw
3.0 tag/L
9
4/27/2021
5.9
5.9
9
4/27/2021
1
1
10
7/13/2021
52.7
52.7
10
7/13/2021
2.2
2.2
11
10/12/2021
19.2
19.2
11
10/12/2021
1.7
1.7
12
1 /11 /2022
42.8
42.8
12
1 /11 /2022
1.2
1.2
13
4/12/2022
24
24
13
4/12/2022
1.2
1.2
14
7/19/2022
10.3
10.3
14
7/19/2022
1.5
1.5
15
10/11/2022
6
6
15
10/11/2022 <
2
1
16
1/17/2023
36.4
36.4
16
1/17/2023
1.4
1.4
17
4/4/2023
36.6
36.6
17
4/4/2023
1.1
1.1
18
7/11/2023
12
12
18
7/11/2023
1.5
1.5
19
10/10/2023
12.3
12.3
19
10/10/2023
1.3
1.3
20
1 /23/2024
3.6
3.6
20
1 /23/2024
1.1
1.1
21
4/23/2024
9.8
9.8
21
4/23/2024
0.98
0.98
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
46728 Freshwater RPA 2024, data
-10- 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par19
Par20
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Selenium
Values" then "COPY".
Silver
Values" then "COPY".
Maximum data points
Maximum data points
=58
=58
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
1
10/8/2019
<
10
5
Std Dev.
1.0258
1
10/8/2019
<
5
2.5
Std Dev.
0.4986
2
11/5/2019
<
1
0.5
Mean
0.6014
2
11/5/2019
<
1
0.5
Mean
0.3571
3
12/10/2019
<
1
0.5
C.V.
1.7056
3
12/10/2019
<
1
0.5
C.V.
1.3960
4
1 /15/2020
<
0.5
0.25
n
21
4
1 /15/2020
<
0.4
0.2
n
21
5
4/7/2020
<
0.5
0.25
5
4/7/2020
<
0.4
0.2
6
7/14/2020
<
0.5
0.25
Mult Factor =
1.86
6
7/14/2020
<
0.4
0.2
Mult Factor =
1.74
7
10/13/2020
<
0.5
0.25
Max. Value
5.0 ug/L
7
10/13/2020
<
0.4
0.2
Max. Value
2.500 ug/L
8
1/12/2021
0.13
0.13
Max. Pred Cw
9.3 ug/L
8
1/12/2021
<
0.4
0.2
Max. Pred Cw
4.350 ug/L
9
4/27/2021
<
1
0.5
9
4/27/2021
<
0.4
0.2
10
7/13/2021
<
1
0.5
10
7/13/2021
<
0.5
0.25
11
10/12/2021
<
1
0.5
11
10/12/2021
<
0.4
0.2
12
1 /11 /2022
<
1
0.5
12
1 /11 /2022
<
0.4
0.2
13
4/12/2022
<
1
0.5
13
4/12/2022
<
0.4
0.2
14
7/19/2022
<
0.5
0.25
14
7/19/2022
<
0.5
0.25
15
10/11/2022
<
1
0.5
15
10/11/2022
<
0.5
0.25
16
1 /17/2023
<
0.5
0.25
16
1 /17/2023
<
0.5
0.25
17
4/4/2023
<
0.5
0.25
17
4/4/2023
<
0.5
0.25
18
7/11 /2023
<
2
1
18
7/11 /2023
<
0.4
0.2
19
10/10/2023
<
0.5
0.25
19
10/10/2023
<
0.5
0.25
20
1 /23/2024
<
0.5
0.25
20
1 /23/2024
<
0.5
0.25
21
4/23/2024
<
0.5
0.25
21
4/23/2024
<
0.5
0.25
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
46728 Freshwater RPA 2024, data
- 11 - 9/11/2024

REASONABLE POTENTIAL ANALYSIS
Par21
Par22
Use "PASTE SPECIAL-
Use "PASTE SPECIAL -
Zinc
Values" then "COPY".
Values" then "COPY".
Maximum data points
Maximum data points
= 58
= 58
Date
Data
BDL=1/2DL
Results
Date Data
BDL=1/2DL Results
1
10/8/2019
41.2
41.2
Std Dev.
14.6539
1
Std Dev.
NO DATA
2
11/5/2019
37.6
37.6
Mean
48.6095
2
Mean
NO DATA
3
12/10/2019
67.4
67.4
C.V.
0.3015
3
C.V.
NO DATA
4
1 /15/2020
29.8
29.8
n
21
4
n
0
5
4/7/2020
56
56
5
6
7/14/2020
49
49
Mult Factor =
1.17
6
Mult Factor =
N/A
7
10/13/2020
42.7
42.7
Max. Value
71.7 ug/L
7
Max. Value
N/A
8
1/12/2021
60.7
60.7
Max. Pred Cw
83.9 ug/L
8
Max. Pred Cw
N/A
9
4/27/2021
71.7
71.7
9
10
7/13/2021
63.8
63.8
10
11
10/12/2021
61.8
61.8
11
12
1 /11 /2022
71.3
71.3
12
13
4/12/2022
49
49
13
14
7/19/2022
44.6
44.6
14
15
10/11 /2022
44.8
44.8
15
16
1 /17/2023
47.1
47.1
16
17
4/4/2023
56.8
56.8
17
18
7/11 /2023
45.3
45.3
18
19
10/10/2023
24.3
24.3
19
20
1 /23/2024
37.1
37.1
20
21
4/23/2024
18.8
18.8
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
46728 Freshwater RPA 2024, data
-12- 9/11/2024

Rocky River WWTP
NCO046728
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) =
7.5000
1Ql0S (cfs) =
0.42
7Q10S (cfs) =
0.50
7Q10W (cfs) =
0.90
30Q2 (cfs) =
1.10
Avg. Stream Flow, QA (cfs) =
5.00
Receiving Stream: Dye Creek HUC 03040105
WWTP/WTP Class: Grade IV
IWC% @ 1Q10S = 96.51307597
IWC% @ 7Q10S = 95.87628866
IWC% @ 7Q10W = 92.81437126
IWC% @ 30Q2 = 91.35559921
IW%C @ QA = 69.92481203
Stream Class: C
Outfall 001
Qw = 7.5 MGD
COMBINED HARDNESS (mg/L)
Acute = 78.53 mg/L
Chronic = 78.25 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
CY
Applied
Chronic Acutea.
D
n # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 352.3
Arsenic
C
150 FW(7Q10s) 340
ug/L
21 5
9.1
_____
Chronic (FW) 156.5
No > Allowable___Cw_
Arsenic
C
10 HH/WS(Qavg)
ug/L
-value
--------------------------------
Chronic (HH) 14.3
No RP, Predicted Max >_ 50% of Allowable Cw
No value > Allowable Cw
based on 1 high nondetect - no monitoring
Acute: 67.35
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
0 0
N/A
-_ _ ----- _ _
-Ch---
---------------------------
Chronic: 6.78
Acute: 5.872
Cadmium
NC
2.3657 TR(7Q10s) 5.6675
ug/L
21 0
0.775
-_ _ _ _
-----------
-Chronic:2.467
---------------------------
No detects - no monitoring or limits
NO DETECTS
Max MDL = 1
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
0 0
N/A
----
-_ _ ----- -_ -- _
Chronic:
---------------------------
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
--Chronic: ----- ---
---------------------------
1-1
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
672.0
Note: n < 9
C.V. (default)
_ _ _ _ _ _ _ _ _ _
Chronic: 328.4
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
RP for Limited Dataset (n < 8 samples) - apply
Limited data set
No value > Allowable Cw
Quarterly Monitoring
Acute: 2,394.4
Chromium III
NC
299.7435 FW(7Q10s) 2310.9537
µg/L
0 0
N/A
-_ _ ----_ _
----
Chronic: -312.E
---------------------------
Acute: 16.6
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
-_ _ ----- _ - _
-Chronic: ---
---------------------------
Tot Cr value(s) < 5 and < Cr VI Allowable Cw
Chromium, Total
NC
µg/L
21 1 3.7 Max reported value = 2.5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
allowable Cw for Cr VI.
46728 Freshwater RPA 2024, rpa
Page 13 of 14 9/11/2024

Rocky River WWTP
NCO046728
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw = 7.5 MGD
Acute: 31.90
Copper
NC
20.8933 FW(7QlOs) 30.7873
ug/L
56 56
13.03
_ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 21.79
_
No RP, Predicted Max >_ 50% of Allowable Cw
No value > Allowable Cw
apply Quarterly Monitoring
Acute: 22.8
Cyanide
NC
5 FW(7QlOs) 22
10
ug/L
20 0
5.0
-_ _ ----- ----
-Chronic:
---------------------------
5 2
No detects - no monitoring or limits
NO DETECTS
Max MDL 10
Acute: NO WQS
Fluoride
NC
1800 FW(7QlOs)
ug/L
0 0
N/A
-_ _ ---- _ _
-Ch--
Chronic: 1,877.4
---------------------------
Acute: 279.390
Lead
NC
10.4674 FW(7QlOs) 269.6477
ug/L
21 5
3.900
------------------------------------------------
Chronic: 10.918
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Mercury
NC
12 FW(7QlOs)
0.5
ng/L
0 0
N/A
--Chronic: ----- ---
---------------------------
12.5
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q I Os)
ug/L
21 21
77.5
------------------------------------------------
Chronic: 2,086.0
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute (FW): 914.6
Nickel
NC
97.7556 FW(7Q10s) 882.7540
µg/L
21 17
3.0
_ _ _ _ _ _ _ _ _ _ _ _
Chronic (FW) 102.0
_ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
N_o value > Allowable Cw
Monitoring required
Nickel
NC
25.0000 WS(7QlOs)
µg/L
Chronic (WS) 26.1
No value > Allowable Cw
Acute: 58.0
Selenium
NC
3.1 FW(7Q10s) 56
ug/L
21 1
9.3
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 3.2
_ _ _ _ _ _ _ _ _ _ _ _ _
RP based on one high nondetect - No Monitoring
1 value(s) > Allowable Cw
required
Acute: 2.199
Silver
NC
0.06 FW(7QlOs) 2.1225
ug/L
21 0
4.350
--Chronic:-----0.063---
---------------------------
No detects - no monitoring or limits
NO DETECTS
Max MDL = 5
Acute: 343.5
Zinc
NC
333.2488 FW(7QlOs) 331.5308
ug/L
21 21
83.9
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 347.6
----------------------------
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute:
0 0
N/A
-_ _
------------
Chronic:
---------------------------
Acute:
0 0
N/A
-_ _
-Chronic:-----------
---------------------------
46728 Freshwater RPA 2024, rpa
Page 14 of 14 9/11/2024

FACILITY: Rocky River WWTP Outfall 001
NPDES PERMIT: NCO046728
Dissolved to Total Metal Calculator
In accordance with Federal Regulations, permit limitations must be written as Total Metals per 40 CFR 122.45(c)
PARAMETER
Cadmium (d)
Cd -Trout stre,
Chromium III (d)(
Chromium VI (d)
Chromium. Total
Nickel(d)(h)
Ni - WS streams
Silver (d)(h,acut
Zinc (d)(h)
Beryllium
Arsenic (c
Receiving
Receiving
Rec. Stream
NPDES
Total Suspended
Combined
Combined
Instream Instream
Effluent
Stream
Stream
Solids
Hardness
Hardness
Wastewater Wastewater
Upstream
Hardness
1Q10
Flow Limit
Hardness
summer
summer 7Q10
-Fixed Value-
chronic
Acute
Concentration Concentration
Average (mg L)
Average
7Q10 (CFS)
(MGD)
[MGD]
[MGD]
( mg/L)
(mg/L)
(mg/L)
(Chronic) (Acute)
(mg/L)
0.5000
0.3226
0.2710
T5000
10
78.251
78.526F
95.8763 96.5131
36.766667
80.0348
Upstream Hard Avg (mg/L) = 36.7667
EFF Hard Avg (mg/L) = 80.0348
Dissolved Metals Criteria
US EPA
Total Metal Criteria
Total Metal =
COMMENTS (identify parameters to PERCS Branch to maintain in facility's LTMP/STMP):
after applying hardness
Translators -using
Dissolved Metal
+Translator
equation
Default Partition
Chronic
Acute
Coefficients
Chronic
Acute
streams
u /I
u /I
0.601
2.18
0.252
2.371
8.65
61
4671
0.202
299.74
2310.95
11
16
1.000
11.00
16.00
N/A
N/A
7.3
10.7
0.348
20.89
30.79
1.92
50
0.184
10.47
269.65
42
382
0.432
97.76
882.75
25 N/A
0.06
2.121
1.0001
0.061 2.12
96
951
0.2881
333.25 331.53
1.0001 IF 6.51 * 65
1.0001 1501 340
(d) = dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(h) = hardness -dependent dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(t) = based upon measurement of total recoveable metal. See 15A NCAC 02B .0211 for more information.
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard.
The Human Health standard for Arsenic is 10 µg/L which is Total Recoverable metal standard.

Permit No. NC0046728
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Q ality Standards/A uatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/l
(Dissolved)
Acute SW, µg/l
(Dissolved)
Chronic SW, µg/l
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
213.0200 (e.g., arsenic at 10 µg/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-[ln hardness](0.041838)} e^{0.9151[In hardness]-3.6236}
Cadmium, Chronic
WER*{1.101672-[ln hardness](0.041838)} e^{0.7998[ln hardness]-4.4451}
Chromium III, Acute
WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 e^{0.9422[ln hardness]-1.700}
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-1.4601
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)} • ell {1.273[ln hardness]-4.705}
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 e^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No. NCO046728
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59)
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 e^{0.8473[ln hardness]+0.884)
Zinc, Chronic
WER*0.986 e^{0.8473[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.
To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q 10 (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. NCO046728
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q 10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator: Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the
equation:
Cdiss = 1
Ctotal 1 + { [Kpo] [ss(I+a)] [10-6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q 10 + Qw) (Cwgs)-(s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q 10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0046728
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
80.03
Submitted DMRs
(Total as CaCO3)
Average Upstream Hardness, mg/L
36.77
Submitted DMRs
(Total as CaCO3)
7Q 10 summer (cfs)
0.5
Current Fact Sheet
1Q10 (cfs)
0.42
Calculated in RPA
Permitted Flow (MGD)
7.5
Current permit
Date: _September 10, 2024_
Permit Writer: GM Perlmutter
Page 4 of 4

9/11/24 WQS = 12 ng/L
Facility Name Town of Mooresville - Rocky River WWTP /
/Permit No.: NC0046728
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-6
No Limit Required
MMP Required
7Q10s = 0.500 cfs WQBEL = 12.52 ng/L
Permitted Flow = 7.500 47 ng/L
10/13/20
1
1
1.0 ng/L
- Annual Average for 2020
1/12/21
<
1
0.5
4/27/21
<
1
0.5
7/13/21
0.944
0.944
10/12/21
1
1
0.7 ng/L
- Annual Average for 2021
1/11/22
0.56
0.56
4/12/22
0.68
0.68
7/19/22
0.501
0.501
10/11/22
1.69
1.69
0.9 ng/L
- Annual Average for 2022
1/17/23
<
1
0.5
4/4/23
0.611
0.611
7/11/23
0.925
0.925
10/10/23
0.862
0.862
0.7 ng/L
- Annual Average for 2023
1/23/24
<
1
0.5
4/23/24
<
1
0.5
0.5 ng/L
- Annual Average for 2024

RE: Rocky River WWTP draft permit
Nicholson, Molly <[e-mail]>
Mon 8/5/2024 3:20 PM
To:Perlmutter, Gary <[e-mail]>
Cc:Moore, Cindy <[e-mail]>
Hi Gary,
The tox sections of this permit look great.
Best,
Molly Nicholson
Environmental Specialist II - Compliance and Enforcement
Aquatic Toxicology Branch
N.C. Division of Water Resources - Water Sciences Section
N.C. Department of Environmental Quality
Please note that my phone number has changed:
919-743-8424 Office
[e-mail]
1621 Mail Service Center, Raleigh, NC 27699-1623
Submit AT Forms electronically to: [e-mail]
From: Perlmutter, Gary <[e-mail]>
Sent: Thursday, July 25, 2024 3:45 PM
To: Campbell, Jeff <[e-mail]>; Pitner, Andrew <[e-mail]>; Bell, Wes
<wes.bell @deq.nc.gov>; Talbott, Jeffrey <[e-mail]>; Hill, Tammy <[e-mail]>; Moore,
Cindy <[e-mail]>; Nicholson, Molly <[e-mail]>; Mcgee, Keyes
<keyes. mcgee@deq. nc.gov>
Cc: Montebello, Michael J <[e-mail]>; Coco, Nick A <[e-mail]>
Subject: Rocky River WWTP draft permit
Dear everyone,
I hope this email finds you well. The draft permit for the Town of Mooresville - Rocky River WWTP
(NC0046728) has been sent to Public Notice for a 30-day comment period. Below are links to relevant
documents:
Permit and cover letter: https://edocs.deq.nc.gov/WaterResources/DocView.aspx?
id=3391778&dbid =0&repo=WaterResources
Fact Sheet: https:Hedocs.deq.nc.gov/WaterResources/DocView.aspx?
id=3396099&dbid =0&repo=WaterResources
I look forward to any comments or questions you may have.
Gary Perlmutter

Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.

Town of Mooresville
North Carolina
Public Utilities —Wastewater Treatment
August 14, 2024
Mr. Gary Perlmutter
Environmetal Specialist II
NPDES Municipal permitting Unit
Subject: Draft NPDES Permit Renewal
Permit # NC0046728
Rocky River WWTP
Iredell County
Grade IV Biological WPCS
SIC Code 4952
Mr. Perlmutter,
Thankyou forsendingthe DRAFT NPDES permit renewal forour review. We have taken time to look over
the draft permit you sent and have the following verifications, questions, and/or concerns we would like
to submit.
1. The Town of Mooresville would like to verify that Total Phenols can be collected along with our
long-term monitoring sampling events, which are conducted quarterly?
2. The Town of Mooresville would like toverifythat the instream monitoring requirements for D.O.,
Temp, Conductivity, and Fecal Coliform are all provisionally waived due to our participation in the
Yadkin -Pee Dee River Basin Association? These samples aren't required to be collected by the
municipality if we maintain membership with the YPDRBA?
3. Why is instream fecal coliform monitoring being added to the new permit if the data is
inconclusive.
4. The Town of Mooresville has not been required to monitor Conductivity in the past even though
we have been receiving industrial wastewater through our pretreatment program. Is there a
reason why we must monitor conductivity daily moving forward?
5. For SectionA.(3.)(a)"eachannualsampleshallcoincidewithonequarterlytoxicitytesteachyear"
Are effluent pollutant scans required to be ran the same week as chronic toxicity or the same
month?
6. Section 6.7 of the fact sheet has weekly monitoring requirements added forTKN and NO3+NO2.
The limits page has monthly monitoring requirements for TKN and NO3+NO2. Can you verify
please?
These are all the verifications, questions, and/or concerns we have as of now, but we still have staff
reviewing their sections of the draft permit. If there are more that come up, I will be sure to reach out
right away. Thank you for your time.
Kindly,
Jeff Campbell
Environmental Compliance Supervisor
P.O. Box 878 Mooresville, NC 28115 704-663-2840 mooresvillenc.gov

[External] EPA Comments on Town of Mooresville - Rocky River WWTP (NC0046728)
Dollar, Carla (she/her/hers) <[e-mail]>
Fri 8/23/2024 2:56 PM
To:Perlmutter, Gary <[e-mail]>
Cc:Montebello, Michael J <[e-mail]>;Bains, Susanna <[e-mail]>;Holliman, Daniel
<[e-mail]>
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message
button located on your Outlook menu bar on the Home tab.
Gary,
In accordance with the U.S. Environmental Protection Agency/State of North Carolina Memorandum of Agreement (MOA)
Section IV, EPA is providing the below comment and recommendation to the Town of Mooresville — Rocky River WWTP
(NC0046728) draft permit and supporting documents received by the EPA on July 25, 2024.
EPA Method 1633 was finalized in January 2024 and is compliant with the quality assurance and control procedures
for chemical analysis of NPDES monitoring samples, as specified in 40 CFR 136.7.
Although the final EPA Method 1633 is not yet published in 40 CFR 136, EPA recommends the use of the method as
a requirement in NPDES permits.
EPA recommends including the requirement to monitor for PFAS beginning on the effective date of the permit or
beginning 6 months after the effective date of the permit to allow laboratories to become certified as needed.
EPA Region 4 requests an opportunity to review the Proposed Final Permit for this facility based on 40 CFR § 123.44(j) and
Section IV.13.6 of the MCA.
Thank you for your consideration of these comments.
Carla Dollar I NPDES Permit Specialist
EPA Region 4 1 Water Division I NPDES Permitting Section
61 Forsyth Street SW — 9T25 I Atlanta, Georgia 30303
[phone] 1 Dollar.carla(@epa.gov

Rocky River WWTP Fact Sheet Addendum NC0046728
Comments to the draft permit NC0046728 were received from NC Division —Aquatic Toxicity Branch
(ATB), the Town of Mooresville (Town) and the US Environmental Protection Agency (USEPA). The ATB
concurred with the permit's toxicity section; no changes were requested. Comments from the Town
and USEPA, and Division responses (in blue) are provided below.
Comments from Jeff Campbell, Environmental Compliance Supervisor, Town of Mooresville
1. The Town would like to verify that Total Phenols can be collected along with our long-term
monitoring sampling events, which are conducted quarterly.
Division Response: Total Phenols quarterly monitoring can be conducted concurrently with
the Town's LTMP schedule. No changes were requested nor made.
2. The Town would like to verifythat the instream monitoring requirements for DO, Temperature,
Conductivity and Fecal Coliform are all provisionally waived due to participation in the
Yadkin -Pee Dee River Basin Association (YPDRBA).
Division Response: Instream monitoring is provisionally waived and is stated as such in
Footnote 2 of Effluent Limitations and Monitoring Requirements section on page 4 of the
permit. No changes were requested nor made.
3. Why is instream fecal coliform monitoring being added to the new permit if the data are
inconclusive?
Division Response: The receiving stream's inconclusive rating for Fecal Coliform is from
monthly sampling, that is of insufficient frequency to evaluate against the standard of
200/100 mL geometric mean based on at least 5 samples taken over a 30-day period. Review
of downstream data found the geometric mean to be 445/100 mL with over 76% of samples
being > 200/100 mL and over 46% of samples > 400/100 mL, suggesting a strong likelihood
that the stream is impaired if sufficient sampling were conducted. Therefore, instream
monitoring for Fecal Coliform was added to the permit. The monitoring coalition waiver,
verified in response to Comment 2, applies to Fecal Coliform. No changes were requested
nor made.
4. Is there a reason why the Town must monitor Conductivity daily?
Division Response: Conductivity is an indicator of industrial waste and instream monitoring
for Conductivity is required per 15A NCAC 02B .0508 unless the facility discharges treated
100% domestic waste. The facility receives industrial waste via a Division -approved
pretreatment program, and reviewed downstream concentrations were found to be elevated.
Therefore, effluent and instream monitoring for conductivity was added to the permit. The
monitoring coalition waiver, verified in response to Comment 3, also applies to instream
Conductivity. No changes were requested nor made.
5. Section A.(3.) (a.) states: "each.annual.sample.shall.coincide.with.one.quarterly.toxicity.test.
each. year.". Are effluent pollutant scans required to be run in the same week as chronic
toxicity or the same month?
Division Response: The term "coincide" means the same day. No changes were requested
nor made.
6. Section 6.7 of the fact sheet has weekly monitoring requirements added for TKN and
NO3+NO2. The limits page as monthly monitoring requirements for TKN and NO3+NO2.
Please verify.

Rocky River WWTP Fact Sheet Addendum NC0046728
Division Response: The permit is correct; section 6.7 of the fact sheet should read "monthly"
as monthly monitoring for TKN and NO3+NO2 is stated in sections 10 and 12 in the fact sheet.
Section 6.7 of the fact sheet was corrected accordingly. No changes were requested nor
made to the permit.
Comments from Carla Dollar, NPDES Permit Specialist, USEPA
1. EPA recommends use of Method 1633 for PFAS monitoring.
Division Response: Method 1633 is referenced in the PFAS monitoring Special Condition
A.(4.) and its list of parameters is provided via a link to the method online document.
2. EPA recommends PFAS monitoring to become effective on the permit effective date or six
months after, not after publication of Method 1633 as a 40 CFR 136 method in the Federal.
Register.
Division Response: PFAS monitoring requirements including monitoring frequency is
evaluated based on the POTW's industrial load and presence of a downstream drinking water
supply watershed (i.e., Class WS waters). Facilities having a large number of EPA -recognized
PFAS source industries and discharging into or above a Class WS water have more stringent
monitoring requirements, including pretreatment requirements. Facilities that discharge
100%treated domestic wastewater into a waterwith no downstream water supplywater have
minimal monitoring of 2/year. The Town or Mooresville — Rocky River WWTP has one potential
PFAS source industrial user (a textile), and discharges into a receiving water with the nearest
downstream Class WS-IV water at —86 miles below the outfall. Due to the relatively low PFAS
potential in the effluent impacting a relatively distant drinking water supply, quarterly
monitoring added to the permit is considered appropriate. Based on the low PFAS potential,
delayed implementation of monitoring is considered appropriate.