NC0024333_Fact Sheet_20200617

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Fact Sheet
NPDES Permit No. NC0024333

Permit Writer/Email Contact Nick Coco, [e-mail]:
Date: March 3, 2020
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017

Permitting Action:
☒ Renewal
☐ Renewal with Expansion
☐ New Discharge
☐ Modification (Fact Sheet should be tailored to mod request)

Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.

Complete applicable sections below. If not applicable, enter NA.

1. Basic Facility Information
Facility Information
Applicant/Facility Name: City of Monroe/Monroe Wastewater Treatment Plant (WWTP)
Applicant Address: P.O. Box 69, Monroe, NC 28111-0069
Facility Address: 775 Treeway Drive, Monroe, NC 28110
Permitted Flow: 10.4 MGD with expansion to 12.5 MGD
Facility Type/Waste: Major Municipal; 66% domestic and 34% industrial*
Facility Class: Grade IV
Treatment Units: Two influent pump stations with a total of six pumps, two mechanical
rotary screens, flow equalization basin, five activated sludge fine-
bubble diffused air aeration basins, four secondary clarifiers, six
activated charcoal tertiary filters, chlorine gas disinfection, sulfur
dioxide gas dechlorination, five aerobic sludge digesters, five sand
drying beds (inactive), filter press and bio-solids cake storage bed with
drainage system connected to facility headworks
Pretreatment Program (Y/N) Y
County: Union
Region Mooresville
*based on permitted flows

Briefly describe the proposed permitting action and facility background: The City of Monroe has
applied for an NPDES permit renewal at 10.4 MGD in July 2018. This facility serves a population of
40,812 residents in several communities, with 7 significant industrial users (SIUs) and 7 categorical
industrial users (CIUs) in their pretreatment program. Treated wastewater is discharged into Richardson
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Creek, a class C water in the Yadkin-Pee Dee River Basin. The facility has a primary Outfall 001. The
average flow as reported in the 2018 permit renewal application was 6.43 MGD.

2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s): Outfall 001 – Richardson Creek
Stream Segment: 13-17-36-(5)
Stream Classification: C
Drainage Area (mi2): 71.1
Summer 7Q10 (cfs) 0.43
Winter 7Q10 (cfs): 1.0
30Q2 (cfs): 1.8
Average Flow (cfs): 64
IWC (% effluent): 97% at 10.4 MGD and 98% at 12.5 MGD
303(d) listed/parameter: Yes/Benthos
Subject to TMDL/parameter: Yes- State wide Mercury TMDL implementation.
Basin/Sub-basin/HUC: Yadkin-Pee Dee River/03-07-14/03040105
USGS Topo Quad: H17NW

3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of August 2016 through February 2020.
Table 1. Effluent Data Summary Outfall 001
Parameter Units Average Max Min Permit
Limit
Flow MGD 6.6 23.44 2.82 MA 10.4
BOD summer mg/l 3.3 17 < 1.5 WA 11.0
MA 7.3
BOD winter mg/l 4.5 14 < 1.5 WA 22.0
MA 14.5
NH3N summer mg/l < 1 < 1 < 1 WA 3.0
MA 1.0
NH3N winter mg/l < 1 < 1 < 1 WA 6.0
MA 2.0
TSS mg/l 4.7 55 1.45 WA 45.0
MA 30.0
pH SU 6.2 6.8 6 6.0 ≥ pH ≤
9.0
Fecal coliform #/100 ml 4.1 620 < 2
(geometric)
WA 400
MA 200
DO mg/l 7.3 9.48 5.76 DA ≥5.0
Temperature ° C 21.3 28 14
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TRC ug/l 10 20 < 10 DM 28
Conductivity umhos/cm 874 1177 219
Oil and Grease mg/l 4.6 5 4.1
TN mg/l 0.04 0.5 0.02
TP mg/l 3.2 4.7 0.99
Cyanide ug/l 10 15.5 5 MA 5.1
DM 22.5
Fluoride ug/l 672 1100 200
Total Copper ug/l 6.2 9.8 3.2
Total Silver ug/l < 1 < 1 < 1
Total Zinc ug/l 68.7 110 32.5
MA-Monthly Average, WA-Weekly Average, DM-Daily Maximum, DA=Daily Average, QA = Quarterly
Average

4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions
when model results for instream DO are within 1 mg/l of instream standard at full permitted flow; 2 ) to
verify model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: The current permit requires instream monitoring for dissolved oxygen, temperature, fecal
coliform and conductivity upstream of the facility at Walkup Avenue and downstream at NCSR 1006
(D1) and NCSR 1630 (D2). The City is a member of the Yadkin-Pee Dee River Basin Association and
their instream requirements are provisionally waived as long as they maintain membership. As such, data
from January 2016 through June 2019 was observed from YPDRBA monitoring station Q8800000,
located upstream of the facility, and station Q8820000, located downstream of the facility. The data has
been summarized in Table 2 below.
Table 2. Instream Monitoring Coalition Data Summary
Parameter Units Q8800000 Upstream Q8820000 Downstream
Average Max Min Average Max Min
Fecal Coliform SU 156
(geomean) 2200 58 161
(geomean)
8000 68
Conductivity umhos/cm 158 249 94 272 807 122
DO mg/l 6.9 11 2.7 7.2 10.5 5.1
Temperature ° C 18.3 27.9 3.4 18.5 28.2 3.7

Students t-tests were run at a 95% confidence interval to analyze relationships between instream
samples. A statistically significant difference is determined when the t -test p-value result is < 0.05
The downstream temperature did not exceed 29 degrees Celsius [per 15A NCAC 02B .0211 (18)]. The
temperature differential did not exceed 2.8 degrees Celsius during the period reviewed. It was concluded
that a statistically significant difference between upstream and downstream temperature exists. However,
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any difference that may exist does not seem to impact compliance with surface water temperature
standards.
Downstream DO did not drop below 5 mg/L [per 15A NCAC 02B .0211 (6)] during the period reviewed.
It was concluded that no statistically significant difference exists between upstream and downstream DO.
It was concluded, based on a student’s t-test with a 95% confidence interval, that a statistically significant
difference exists between upstream and downstream conductivity. Effluent conductivity was consistently
higher than upstream conductivity during the review period and appears to be influencing conductivity
levels downstream. Instream and effluent conductivity monitoring will continue to be a permit
requirement.
Downstream fecal coliform did not exceed a geomean of 200/100ml, nor did it exceed 400/100ml in more
than 20% of samples [per 15A NCAC 02B .0211 (7).4)] during the period reviewed. Based on a student’s
t-test, it was concluded with 95% confidence that a statistically significant difference (p -value < .05)
between upstream and downstream fecal coliform exists. However, any difference that may exist does not
seem to impact compliance with surface water fecal coliform standards.
The draft permit maintains the same instream monitoring requirements as the current permit.

Is this facility a member of a Monitoring Coalition with waived instream monitoring (Y/N): YES
Name of Monitoring Coalition: Yadkin-Pee Dee River Basin Association

5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported one flow
limit violation in December 2018 resulting in a NOD.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 17 of 18 quarterly chronic toxicity tests between March 2016 and
December 2019, as well as all 4 second species chronic toxicity tests conducted between June 2016 and
December 2019. The facility failed a chronic toxicity test in March 2018 but passed three consecutive
tests in the following three months.
Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in January 2020 reported that the facility was in compliance.

6. Water Quality-Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic
Life; non-carcinogen 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
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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: In 1994, BOD5 and
ammonia limits were set at 5/10 and 2/4 mg/L (Monthly Average/Weekly Average), respectively, based
off of the results from a Level B model. In 1996, the permit was modified to increased BOD 5 limits to
7.3/11 mg/L (Monthly Average/Weekly Average) and reduce ammonia limits to 1 mg/L year-round while
maintaining ultimate BOD discharged. Seasonal BOD5 limits were developed in 2001. Monthly average
and weekly maximum BOD5 limits were set to 7.3 and 11.0 mg/L in the summer. Monthly average and
weekly maximum BOD5 limits were set to 14.5 and 22.0 mg/L in the winter. In 2004, the facility was re-
rated from 9 MGD to 10.4 MGD. The BOD5 limits were maintained as the 5 mg/L DO standard was
protected in the stream. The facility also has a 12.5 MGD flow tier at which BOD5 is limited to 5/7.5
mg/L in the summer and 10/15 mg/L in the winter (Monthly Average/Weekly Average). No changes are
proposed.

Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/l (summer) and 1.8 mg/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 ug/l) and capped at 28 ug/l (acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/l are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: In 1994, BOD5
and ammonia limits were set at 5/10 and 2/4 mg/L (Monthly Average/Weekly Average), respectively,
based off of the results from a Level B model. In 1996, the permit was modified to increased BOD 5 limits
to 7.3/11 mg/L (Monthly Average/Weekly Average) and reduce ammonia limits to 1 mg/L ye ar-round
while maintaining ultimate BOD discharged. Seasonal ammonia limits were developed in 2001.
Ammonia limits were set to 1 mg/L in the summer and 2 mg/L in the winter. In 2004, the facility was re -
rated from 9 MGD to 10.4 MGD. Weekly average limits were developed for ammonia. Monthly average
and weekly maximum ammonia limits were set to 1.0 and 3.0 mg/L in the summer. Monthly average and
weekly maximum ammonia limits were set to 2.0 and 6.0 mg/L in the winter. These limits are maintained
at the 12.5 MGD flow tier. The ammonia limits have been reviewed in the attached WLA and have been
found to be protective. No changes are proposed.
As the facility uses chlorine gas disinfection, total residual chlorine (TRC) is limited in the permit. The
current permit limits TRC at 17ug/L as a daily maximum. The TRC limits have been reviewed in the
attached WLA and have been found to be protective. No changes are proposed for TRC.

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Reasonable Potential Analysis (RPA) for Toxicants
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of ½ detection limit for “less than” values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between August 2016
and January 2020. Pollutants of concern included toxicants with positive detections and associated water
quality standards/criteria. Based on this analysis, the following permitting actions are proposed for this
permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality-based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable
water quality standards/criteria: Cyanide
• Monitoring Only. The following parameters will receive a monitor-only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria,
but the maximum predicted concentration was >50% of the allowable concentration: Chlorides,
Fluoride
• 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, Total Chromium, Copper, Lead, Molybdenum, Nickel,
Selenium, Silver, Zinc
• POTW Effluent Pollutant Scan Review: Five effluent pollutant scans were evaluated for
additional pollutants of concern.
o The following parameter(s) will receive a water quality-based effluent limit (WQBEL)
with monitoring, since as part of a limited data set, two samples exceeded the allowable
discharge concentration: NA
o The following parameter(s) will receive a monitor-only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration: NA
o The following parameters will not receive a limit or monitoring, since they did not
demonstrate reasonable potential to exceed applicable water quality standards/criteria and
the maximum predicted concentration was <50% of the allowable concentration: Total
Phenolic Compounds

As the facility uses gas chlorination for disinfection, the RPA was run on bromodichloromethane and
dibromochloromethane, two disinfection byproducts. The data set was limited (n = 5 samples) and all
samples were reported at lower than 30% of the facility’s allowable discharge concentrations for each
parameter. As such, no monitoring requirement or limit was added to the permit.
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.

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Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging “complex” wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: This is a Major POTW, and a chronic WET limit at 90%
effluent will continue on a quarterly frequency at both the 10.4 MGD and 12.5 MGD flow tiers.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply
with EPA’s mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (~2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (>1 ng/l) will
receive an MMP requirement. Industrials are evaluated on a case-by-case basis, depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/l) and/or if any individual value exceeds a TBEL
value of 47 ng/l
Table 3. Mercury Effluent Data Summary
2016 2017 2018 2019
# of Samples 2 5 7 5
Annual Average Conc. ng/L 1.3 1.7 1.2 1.41
Maximum Conc., ng/L 1.73 2.91 1.95 2.38
TBEL, ng/L 47
WQBEL, ng/L 12.3

Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL, and no individual mercury sample exceeded the TBEL, no mercury
limit is required. However, since the facility is >2 MGD and reported quantifiable levels of mercury (> 1
ng/l), the mercury minimization plan (MMP) special condition has been added to the permit.

Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit: NA

Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: NA
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
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If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H.0107( c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B.0226 for this permit renewal: NA

7. Technology-Based Effluent Limitations (TBELs)
Municipals (if not applicable, delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/l
BOD5/TSS for Monthly Average, and 45 mg/l for BOD5/TSS for Weekly Average). YES
If NO, provide a justification for alternative limitations (e.g., waste stabilization pond). NA

Are 85% removal requirements for BOD5/TSS included in the permit? YES
If NO, provide a justification (e.g., waste stabilization pond). NA

8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.0105( c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
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(l) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated: NA

10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2)
NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
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considered effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti-
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
The City of Monroe was granted monitoring frequency reductions for BOD5, Total Suspended Solids,
NH3-N and Fecal Coliform for their 2014 NPDES permit renewal based on DWR Guidance Regarding
the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally Performing Facilities. In
their NPDES permit renewal application submitted on July 31, 2018, the City requested the frequency
reductions be maintained. The last three years of the facility’s data for these parameters have been
reviewed in accordance with the criteria outlined in the guidance. The Division has decided to maintain
the 2/week monitoring frequency requirements for BOD5, Total Suspended Solids, NH3-N and Fecal
Coliform.

11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs) electronically. Effective December 21, 2020, NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting, consistent with Federal requirements.

12.Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes 10.4 MGD
Parameter Current Permit Proposed Change Basis for Condition/Change
Flow MA 10.4 MGD with
expansion to 12.5 MGD
No changes 15A NCAC 2B .0505
BOD5 @ 10.4 MGD
Summer:
MA 7.3 mg/l
WA 11.0 mg/l
Winter:
MA 14.5 mg/l
WA 22.0 mg/l
@ 12.5 MGD
Summer:
MA 5.0 mg/l
WA 7.5 mg/l
Winter:
MA 10.0 mg/l
WA 15.0 mg/l

Monitor 2/Week
No changes WQBEL. Based on 1994 Level B
Model and 1996 Ultimate BOD
recalculation. DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities. Protection of
DO standard 15A NCAC 2B .0200.
NH3-N Summer:
MA 1 mg/l
WA 3 mg/l
Winter:
MA 2 mg/l
No changes WQBEL. Based on 1994 Level B
Model and 1996 Ultimate BOD
recalculation. DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
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WA 6 mg/l
Monitor 2/Week
Permits for Exceptionally
Performing Facilities. Protection of
DO standard 15A NCAC 2B .0200.
TSS MA 30 mg/l
WA 45 mg/l
Monitor 2/Week
No changes TBEL. Secondary treatment
standards/40 CFR 133 / 15A NCAC
2B .0406. DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
Fecal coliform MA 200 /100ml
WA 400 /100ml
Monitor 2/Week
No changes WQBEL. State WQ standard, 15A
NCAC 2B .0200. DWR Guidance
Regarding the Reduction of
Monitoring Frequencies in NPDES
Permits for Exceptionally
Performing Facilities
DO > 5 mg/l No change WQBEL. State WQ standard, 15A
NCAC 2B .0200
pH 6 – 9 SU No change WQBEL. State WQ standard, 15A
NCAC 2B .0200
Temperature Monitor and Report
daily
No change 15A NCAC 2B .0500 – Surface
Water Monitoring: Reporting
TRC DM 28 DM 17 WQBEL. Based on 2020 WLA
calculations
Conductivity Monitor and Report
Daily
No change 15A NCAC 2B .0500 – Surface
Water Monitoring: Reporting
Oil and Grease Monitor and Report
Monthly
No change

15A NCAC 2B .0500 – Surface
Water Monitoring: Reporting
Total Nitrogen Monitor and Report
Monthly
No change

15A NCAC 2B .0500 – Surface
Water Monitoring: Reporting
Total Phosphorus Monitor and Report
Monthly
No change 15A NCAC 2B .0500 – Surface
Water Monitoring: Reporting
Cyanide MA 5.1 ug/l
DM 22.5 ug/l
No change WQBEL. Based on results of RPA;
RP shown - apply Monthly
Monitoring with Limit
Fluoride Monitor and Report
Quarterly
No change Based on results of RPA; No RP ,
Predicted Max ≥ 50% of Allowable
Cw - apply Quarterly Monitoring
Chlorides No requirement Monitor and Report
Quarterly
Based on results of RPA; No RP ,
Predicted Max ≥ 50% of Allowable
Cw - apply Quarterly Monitoring
Total Copper Monitor and Report
Quarterly
No requirement Based on results of RPA; No RP,
Predicted Max < 50% of Allowable
Cw - No Monitoring required
Total Silver Monitor and Report
Quarterly
No requirement Based on results of RPA; No RP,
Predicted Max < 50% of Allowable
Cw - No Monitoring required
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Total Zinc Monitor and Report
Quarterly
No requirement Based on results of RPA; No RP,
Predicted Max < 50% of Allowable
Cw - No Monitoring required
Total Hardness No requirement Quarterly monitoring
Upstream and in
Effluent
Hardness-dependent dissolved
metals water quality standards
approved in 2016; facility with
pretreatment program
Toxicity Test Chronic limit, 90%
effluent at both flow
tiers
No change WQBEL. No toxics in toxic
amounts. 15A NCAC 2B.0200 and
15A NCAC 2B.0500
Effluent Pollutant
Scan
Three times per permit
cycle
No change 40 CFR 122
Mercury
Minimization Plan
(MMP)
No requirement Add MMP special
condition
Consistent with 2012 Statewide
Mercury TMDL Implementation.
Electronic
Reporting
Electronic Reporting
Special Condition
No change In accordance with EPA Electronic
Reporting Rule 2015.
MGD – Million gallons per day, MA - Monthly Average, WA – Weekly Average, DM – Daily Max, QA
–Quarterly Average
13. Public Notice Schedule:
Permit to Public Notice: 03/23/2020
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 questions regarding any of the above information or on the attached permit, please contact
Nick Coco at [phone] or via email at [e-mail]
15.Fact Sheet Addendum (if applicable):
The draft permit was also submitted to the City of Monroe, EPA Region 4, the Mooresville Regional
Office, and the Division’s Operator Certification Program, Aquatic Toxicology Branch and Ecosystems
Branch. The Aquatic Toxicology Branch submitted some comments to fix typographical errors in the
effluent tables. No comments were received from the other parties.
Were there any changes made since the Draft Permit was public noticed (Yes/No): YES
If Yes, list changes and their basis below:
•The language for the Chronic Toxicity requirement in sections A. (1.) and A. (2.) has been
revised to refer the Permittee to the correct footnote.
•A notation was made concerning the Electronic Reporting Rule – Phase 2 Extension. EPA is
proposing to extend the Phase 2 deadline from December 21, 2020, to December 21, 2023. The
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current compliance date will be extended if the implementation date is extended as a final
regulation change in the federal register.
16. Fact Sheet Attachments (if applicable):
•RPA Spreadsheet Summary
•BOD and TSS Removal
•Dissolved Metals Implementation/Freshwater
•Monitoring Frequency Reduction Assessment
•Waste Load Allocation Spreadsheet
•Mercury TMDL Spreadsheet
•Toxicity Summary
•Instream Monitoring Summary
•Compliance Inspection Report
Public Notice
AFFP
North Carolina
Public Notice
Environmental Management
Commission/NPDES Unit
Affidavit of Publication
Mai) Service Center
Ral
Raleigh, NC 27699-1617
Notice of Intent to Issue a NP-
STATE OF NORTH ss
DES Wastewater Permit
CAROLINA
NCO024333 City of Monroe
COUNTY OF )UA;
WWTP
The North Carolina Environ-
Kimberly Cook, being duly sworn, says:
mental Management Commis-
sion proposes to issue a NP-
That she is the billing clerk of the The Enquirer Journal, a
DES wastewater discharge
daily newspaper of general circulation, printed and
permit to the person(s) listed
published in Monroe, County, North Carolina; that the
below. Written comments re-
publication, a copy of which is attached hereto, was
garding the proposed permit
published in the said newspaper on the following dates:
will be accepted Until 30 days
March 31, 2020
after the publish date of this
notice. The Director of the NC
Division of Water Resources
(DWR) may hold a public
hearing should there be a sig-
nificant degree of public in -
terest. Please mail comments
That said newspaper was regularly issued and circulated
and/or information requests to
on those dates.
SIGNED:
DWR at the above address.
Interested persons may visit
l� �
✓Y
the DWR at 512 N. Salisbury
the billing clerk
Street, Raleigh, NC to review
information on file. Additional
Subscribed to and sworn to me this 31st day of March
information on NPDES per-
2020.
mits and this notice may be
found on our website:
http://deq. nc.gov/about/divi-
sions/water-resources/water-
m�..�:
Barbara M Daniels, Notary, Guilford County, County,
resources-permits/wastewa-
ter - branch/npdes-
NorthCarolina
My commission expires: February 01, 2022
wastewater/public-notices,or
by calling [phone]. The
City of Monroe has requested
renewal of permit NCO024333
for its WWTP in Union County.
30146484 30901064
Discharge is treated municip-
Wren Thedford
al & industrial wastewater to
Division Of Water Resources131
Richardson Creek, In the
1617 Mail Service Center ._.......
Yadkin - Pee Dee River Basin.
Raleigh, NC 27699
BOD5, ammonia, fecal coli-
form, dissolved oxygen, pH,
total residual chlorine, and cy-
anide are water quality limited.
Mar. 31, 2020

1
Coco, Nick A
From:Kyle Ketchum <[e-mail]>
Sent:Thursday, March 5, 2020 2:22 PM
To:Coco, Nick A
Cc:Russell Colbath
Subject:[External] RE: NC0024333 City of Monroe WWTP Additional Information Request
Attachments:PPA LLHg 6 2016.pdf; PPA LLHg 9 2015.pdf; PPA LLHg 9 2017.pdf; QI18043 Report
9-2015.pdf; RF08046 Report 6-2016.pdf; SI13034_Report 9-2017.pdf; TC07129_Report
3-2018.pdf; TC09073_Report 3-2018 LL Hg.pdf; TD04102_Report 4-18.pdf
Follow Up Flag:Follow up
Flag Status:Flagged
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to 
[e-mail] 

Good afternoon Nick, 

I have answered the four bullets below in blue. 
Please find attached the lab reports you requested. 

Thanks 

Kyle Ketchum
City of Monroe
Wastewater Treatment Plant Superintendent
Office 704-282-4612
775 Treeway Drive
PO Box 69
Monroe NC 28111
[e-mail]
monroenc.org

E-mail correspondence to and from this address may be subject to North Carolina's public records laws and if
so, may be disclosed.

From: Coco, Nick A <[e-mail]>  
Sent: Thursday, March 05, 2020 10:28 AM 
To: Kyle Ketchum <[e-mail]> 
Subject: NC0024333 City of Monroe WWTP Additional Information Request 

Hi Kyle, 

I hope all is well. 
2

I’ve been assigned and am working on the renewal for the NPDES permit NC0024333 for the Monroe WWTP. Would you 
please email me copies of the 5 effluent pollutant scans you had taken, whenever you get the chance?  

Additionally, in conformity with the DWR Guidance Regarding the Reduction of Monitoring Frequencies in NPDES 
Permits for Exceptionally Performing Facilities, I need you to verify/confirm the following criteria: 

 The facility has no more than one civil penalty assessment for permit limit violations for each target parameter 
during the previous three years. This is correct. 
 Neither the permittee nor any of its employees have been convicted of criminal violations of the Clean Water 
Act within the previous five years. To the best of my knowledge, this is correct. 
 The facility is not currently under an SOC for target parameter effluent limit noncompliance. This is correct. 
 The facility is not on EPA’s Quarterly Noncompliance Report for target parameter limit violations. This is correct. 

Let me know if you have any questions or concerns. Thanks for your help. 

Best, 
Nicholas A. Coco, EI 
Engineer 
NPDES Complex Permitting Unit 
NC DEQ / Division of Water Resources / Water Quality Permitting 

919 707‐3609    office 
919 707 9000    main office 
[e-mail] 

Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604 
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699‐1617 

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

Reduction in Frequency EvalautionFacility:Permit No.Review period (use 3 yrs)Approval Criteria:Y/N?YYNData Review UnitsWeekly average limitMonthly average limit50% MA3‐yr mean (geo mean for FC)< 50%?200% MA# daily samples >200%<15?200% WA# daily samples >200%< 20?# of non‐monthly limit violations> 2?# civil penalty asessment> 1?Reduce Frequency? (Yes/No)BOD (summer) mg/L 11 7.3 3.7 3.091791 Y 14.6 6 Y 0 N 0 N YBOD (winter) mg/L 22 14.5 7.3 4.5101246 Y 29 1 Y 0 N 0 N YTSS mg/L 45 30 15 4.4935397 Y 60 0 Y 0 N 0 N YAmmonia (summer) mg/L 3 1 0.5 0.5 Y 2 0 Y 0 N 0 N YAmmonia (winter) mg/L 6 2 1 0.4937695 Y 4 0 Y 0 N 0 N YFecal Coliform #/100 400 200 100 2.5355617 Y 800 0 Y 0 N 0 N Y1. Not currently under SOS2. Not on EPA Quarterly noncompliance report3. Facility or employees convicted of CWA violationsMonroe WWTPNC00243331/2017 ‐ 1/2020
REQUIRED DATA ENTRY
Name WQS Type Chronic Modifier Acute PQL Units
Facility Name Monroe WWTP Par01 Arsenic Aquactic Life C 150 FW 340 ug/L
WWTP/WTP Class IV Par02 Arsenic Human Health
Water Supply C 10 HH/WS N/A ug/L
NPDES Permit NC0024333 Par03 Beryllium Aquatic Life NC 6.5 FW 65 ug/L
Outfall 001 Par04 Cadmium Aquatic Life NC 1.9621 FW 13.0062 ug/L
Flow, Qw (MGD)10.400 Par05 Chlorides Aquatic Life NC 230 FW mg/L
Receiving Stream Richardson Creek Par06 Chlorinated Phenolic Compounds Water Supply NC 1 A ug/L
HUC Number 03040105 Par07 Total Phenolic Compounds Aquatic Life NC 300 A ug/L
Stream Class Par08 Chromium III Aquatic Life NC 433.6373 FW 3339.8485 ug/L
Par09 Chromium VI Aquatic Life NC 11 FW 16 µg/L
7Q10s (cfs)0.43 Par10 Chromium, Total Aquatic Life NC N/A FW N/A µg/L
7Q10w (cfs)1.00 Par11 Copper Aquatic Life NC 30.7139 FW 47.0291 ug/L
30Q2 (cfs)1.80 Par12 Cyanide Aquatic Life NC 5 FW 22 10 ug/L
QA (cfs)64.00 Par13 Fluoride Aquatic Life NC 1,800 FW ug/L
1Q10s (cfs)0.36 Par14 Lead Aquatic Life NC 17.1062 FW 440.0562 ug/L
Effluent Hardness 124.59 mg/L (Avg)Par15 Mercury Aquatic Life NC 12 FW 0.5 ng/L
Upstream Hardness 57 mg/L (Avg)Par16 Molybdenum Human Health NC 2000 HH ug/L
Combined Hardness Chronic 122.83 mg/L Par17 Nickel Aquatic Life NC 143.1547 FW 1291.3614 µg/L
Combined Hardness Acute 123.11 mg/L Par18 Nickel Water Supply NC 25.0000 WS N/A µg/L
Data Source(s)Par19 Selenium Aquatic Life NC 5 FW 56 ug/L
Par20 Silver Aquatic Life NC 0.06 FW 4.5997 ug/L
Par21 Zinc Aquatic Life NC 488.3005 FW 485.2727 ug/L
Par22 Bromodichloromethane Human Health C 27 FW µg/L
Par23 Dibromochloromethane Human Health C 21 FW µg/L
Par24
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
To appy a Model IWC %: Once the
"Flow, Qw (MGD)" and and the
"CHRONIC DILUTION FACTOR =
" values are entered, the 7Q10s
(cfs) flow is calculated and
displayed. Enter the calculated
"7Q10s (cfs)" flow value in Table 1.
Table 1. Project Information Table 2. Parameters of Concern
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
C
CHECK IF HQW OR ORW WQS
CHECK TO APPLY MODEL
Apply WS Hardness WQC
RPA, input
3/5/2020
REQUIRED DATA ENTRY
Name WQS Type Chronic Modifier Acute PQL Units
Facility Name Monroe WWTP Par01 Arsenic Aquactic Life C 150 FW 340 ug/L
WWTP/WTP Class IV Par02 Arsenic Human Health
Water Supply C 10 HH/WS N/A ug/L
NPDES Permit NC0024333 Par03 Beryllium Aquatic Life NC 6.5 FW 65 ug/L
Outfall 001 Par04 Cadmium Aquatic Life NC 1.9656 FW 13.0286 ug/L
Flow, Qw (MGD)12.500 Par05 Chlorides Aquatic Life NC 230 FW mg/L
Receiving Stream Richardson Creek Par06 Chlorinated Phenolic Compounds Water Supply NC 1 A ug/L
HUC Number 03040105 Par07 Total Phenolic Compounds Aquatic Life NC 300 A ug/L
Stream Class Par08 Chromium III Aquatic Life NC 434.4716 FW 3345.2580 ug/L
Par09 Chromium VI Aquatic Life NC 11 FW 16 µg/L
7Q10s (cfs)0.43 Par10 Chromium, Total Aquatic Life NC N/A FW N/A µg/L
7Q10w (cfs)1.00 Par11 Copper Aquatic Life NC 30.7756 FW 47.1167 ug/L
30Q2 (cfs)1.80 Par12 Cyanide Aquatic Life NC 5 FW 22 10 ug/L
QA (cfs)64.00 Par13 Fluoride Aquatic Life NC 1,800 FW ug/L
1Q10s (cfs)0.36 Par14 Lead Aquatic Life NC 17.1497 FW 440.9975 ug/L
Effluent Hardness 124.59 mg/L (Avg)Par15 Mercury Aquatic Life NC 12 FW 0.5 ng/L
Upstream Hardness 57 mg/L (Avg)Par16 Molybdenum Human Health NC 2000 HH ug/L
Combined Hardness Chronic 123.12 mg/L Par17 Nickel Aquatic Life NC 143.4392 FW 1293.5220 µg/L
Combined Hardness Acute 123.35 mg/L Par18 Nickel Water Supply NC 25.0000 WS N/A µg/L
Data Source(s)Par19 Selenium Aquatic Life NC 5 FW 56 ug/L
Par20 Silver Aquatic Life NC 0.06 FW 4.6153 ug/L
Par21 Zinc Aquatic Life NC 489.2725 FW 486.0859 ug/L
Par22 Bromodichloromethane Human Health C 27 FW µg/L
Par23 Dibromochloromethane Human Health C 21 FW µg/L
Par24
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
To appy a Model IWC %: Once the
"Flow, Qw (MGD)" and and the
"CHRONIC DILUTION FACTOR =
" values are entered, the 7Q10s
(cfs) flow is calculated and
displayed. Enter the calculated
"7Q10s (cfs)" flow value in Table 1.
Table 1. Project Information Table 2. Parameters of Concern
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
C
CHECK IF HQW OR ORW WQS
CHECK TO APPLY MODEL
Apply WS Hardness WQC
RPA, input
3/5/2020
REASONABLE POTENTIAL ANALYSISH1H2Par01 & Par02Effluent Hardness Upstream Hardness ArsenicDate Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results1 8/3/2016 130 130 Std Dev. 23.1589 1 5/17/201855 55 Std Dev. 10.2062 1 8/24/2016 < 1 0.5 Std Dev. 0.53012 9/7/2016 130 130 Mean 124.58702 5/22/201835 35 Mean 57.0000 2 11/16/2016< 1 0.5 Mean 1.11113 10/5/2016 140 140 C.V. 0.1859 3 5/24/201947 47 C.V. 0.1791 3 3/8/2017 < 2 1 C.V. 0.47714 11/9/2016 140 140 n 46 4 5/31/201849 49 n 13 4 6/7/2017 < 2 1 n 185 12/7/2016 110 110 10th Per value96.00mg/L 5 6/1/2018 48 48 10th Per value47.20mg/L 5 8/16/2017 < 2 16 1/4/2017 78 78Average Value124.59mg/L 6 6/5/2018 57 57Average Value57.00mg/L 6 9/12/2017 < 2 1 Mult Factor =1.337 2/15/2017 120 120 Max. Value 180.00 mg/L 7 6/7/2018 58 58 Max. Value 73.00 mg/L 7 11/15/2017< 2 1 Max. Value 2.5 ug/L8 3/8/2017 150 150 8 6/12/201859 59 8 2/14/2018< 2 1 Max. Pred Cw O DETECTS ug/L9 4/5/2017 100 100 9 6/14/201865 65 9 3/6/2018 < 5 2.510 5/3/2017 120 120 10 6/19/201873 73 10 4/3/2018 < 5 2.511 6/7/2017 97 97 11 6/21/201865 65 11 5/9/2018 < 2 112 7/12/2017 130 130 12 6/26/2018 65 65 12 7/18/2018 < 2 113 8/9/2017 120 120 13 6/28/201865 65 13 10/17/2018<2 114 9/12/2017 120 120 1414 3/6/2019 < 2 115 9/13/2017 82 82 1515 5/15/2019<2 116 10/4/2017 120 120 1616 8/14/2019 < 2 117 11/8/2017 140 140 1717 9/10/2019<2 118 12/6/2017 140 140 1818 11/20/2019<2 119 1/10/2018130 130 191920 2/7/2018 95 95 202021 3/6/2018 110 110 212122 3/7/2018 120 120 222223 4/3/2018 110 110 232324 4/4/2018 110 110 242425 5/9/2018 140 140 252526 6/6/2018 150 150 262627 7/11/2018140 140 272728 8/8/2018 150 150 282829 9/12/2018160 160 292930 10/3/2018150 150 303031 11/7/2018 97 97 313132 12/5/2018 86 86 323233 1/9/2019 100 100 333334 2/6/2019 110 110 343435 3/6/2019 86 86 353536 4/3/2019 110 110 363637 5/8/2019 130 130 373738 6/5/2019 140 140 383839 7/3/2019 150 150 393940 8/7/2019 120 120 404041 9/10/2019 130 130 414142 9/11/2019 140 140 424243 10/9/2019 180 180 434344 11/6/2019 170 170 444445 12/4/2019 140 140 454546 1/8/2020 110 110 4646474747484848494949505050515151525252535353545454555555565656575757585858Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58- 1 -RPA, data3/5/2020
REASONABLE POTENTIAL ANALYSISPar04Par05Par07Par10Cadmium Chlorides Total Phenolic Compounds Chromium, TotalDate Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DLResults1 8/24/2016 <0.10.05 Std Dev. 0.5480 1 8/3/2016 150 150 Std Dev. 27.16651 8/24/2016<20.0 10.0 Std Dev. 3.3541 1 8/24/2016<5 3 Std Dev. 0.02 11/16/2016<0.10.05 Mean 0.3306 2 8/24/2016 170 170 Mean 142.5 2 9/12/2017<20.0 10.0 Mean 8.5000 2 11/16/2016<5 3 Mean 2.53 3/8/2017 <0.50.25 C.V. 1.6579 3 9/7/2016 150 150 C.V. 0.1907 3 3/6/2018<20.0 10.0 C.V. (default) 0.6000 3 3/8/2017<5 3 C.V. 0.04 6/7/2017 <0.50.25 n 18 4 10/5/2016 170 170 n 52 4 4/3/2018<20.0 10.0 n 5 4 6/7/2017<53n 185 8/16/2017 <0.50.25 5 11/9/2016 160 160 5 9/10/2019<5.0 2.5 5 8/16/2017<536 9/12/2017 <0.50.25 Mult Factor =2.056 11/16/2016 160 160 Mult Factor =1.06 Mult Factor =2.326 9/12/2017<5 3 Mult Factor =1.007 11/15/2017<0.50.25 Max. Value 2.500 ug/L 7 12/7/2016 130 130 Max. Value 180.0 mg/L 7 Max. Value 10.0 ug/L 7 11/15/2017<5 3 Max. Value 2.5 µg/L8 2/14/2018<0.50.25 Max. Pred Cw NO DETECTS ug/L 8 1/4/2017 72 72 Max. Pred Cw 181.8 mg/L 8 Max. Pred Cw O DETECTS ug/L 8 2/14/2018<5 3 Max. Pred CwETECTS µg/L9 3/6/2018 <0.10.05 9 2/15/2017 160 160 99 3/6/2018<5310 4/3/2018 <0.10.05 10 3/8/2017 170 170 1010 4/3/2018<5311 5/9/2018 <0.50.25 11 4/5/2017 120 120 1111 5/9/2018<5312 7/18/2018 <52.5 12 5/3/2017 140 140 1212 7/18/2018<5313 10/17/2018<0.50.25 13 6/7/2017 115 115 1313 10/17/2018<5314 3/6/2019 <0.50.25 14 7/12/2017 160 160 1414 3/6/2019<5315 5/15/2019<0.50.25 15 8/9/2017 150 150 1515 5/15/2019<5316 8/14/2019 <0.50.25 16 8/16/2017 130 130 1616 8/14/2019<5317 9/10/2019<0.50.25 17 9/13/2017 91 91 1717 9/10/2019<5318 11/20/2019<0.50.25 18 10/4/2017 160 160 1818 11/20/2019<531919 11/8/2017 150 150 19192020 11/15/2017140 140 20202121 12/6/2017 150 150 21212222 1/10/2018160 160 22222323 2/7/2018 96 96 23232424 2/14/2018110 110 24242525 3/7/2018 130 130 25252626 4/4/2018 140 140 26262727 5/9/2018 180 180 27272828 6/6/2018 160 160 28282929 7/11/2018180 180 29293030 7/18/2018180 180 30303131 8/8/2018 160 160 31313232 9/12/2018 180 180 32323333 10/3/2018 170 170 33333434 10/17/2018 140 140 34343535 11/7/2018 93 93 35353636 12/5/2018 120 120 36363737 1/9/2019 120 120 37373838 2/6/2019 150 150 38383939 3/6/2019 82 82 39394040 4/3/2019 110 110 40404141 5/8/2019 140 140 41414242 5/15/2019 120 120 42424343 6/5/2019 170 170 43434444 7/3/2019 170 170 44444545 8/7/2019 130 130 45454646 8/14/2019 160 160 46464747 9/11/2019 170 170 47474848 10/9/2019 170 170 48484949 11/6/2019 150 150 49495050 11/20/2019 130 130 50505151 12/4/2019 130 130 51515252 1/8/2020 110 110 5252535353535454545455555555565656565757575758585858Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58- 2 -RPA, data3/5/2020
REASONABLE POTENTIAL ANALYSISPa11Par12Par13Par14Copper Cyanide Fluoride LeadDate Data BDL=1/2DL Results Date Data BDL=1/2DLResults Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results1 9/14/2017 6 5.8 Std Dev. 1.4143 1 10/31/2019< 10 5 Std Dev. 0.6565 1 9/14/2017 600 600 Std Dev. 235.98251 8/24/2016 < 1 0.5 Std Dev. 0.25082 10/4/2017 7 7 Mean 6.5224 2 11/1/2019< 10 5 Mean 5.09 2 10/4/2017 810 810 Mean 673.53452 11/16/2016< 1 0.5 Mean 0.69443 11/8/2017 5 4.6 C.V. 0.2168 3 11/4/2019< 10 5 C.V. 0.1291 3 11/8/2017 920 920 C.V. 0.3504 3 3/8/2017 < 1 0.5 C.V. 0.36124 11/15/20174 4.2 n 58 4 11/5/2019< 10 5 n 58 4 11/15/2017870 870 n 58 4 6/7/2017 < 1 0.5 n 185 12/5/2017 5 5.3 5 11/6/2019< 10 5 5 12/5/2017 860 860 5 8/16/2017 < 1 0.56 12/6/2017 3 3.3 Mult Factor =1.006 11/7/2019 < 10 5 Mult Factor =1.006 12/6/2017 850 850 Mult Factor =1.006 9/12/2017 < 1 0.5 Mult Factor =1.247 12/7/2017 3 3.2 Max. Value 9.80 ug/L 7 11/8/2019< 10 5 Max. Value 10.0 ug/L 7 12/7/2017 920 920 Max. Value 1100.0 ug/L 7 11/15/2017< 1 0.5 Max. Value 1.000 ug/L8 1/10/20183 3.3 Max. Pred Cw 9.80 ug/L 8 11/12/2019< 10 5 Max. Pred Cw 10.0 ug/L 8 1/10/2018840 840 Max. Pred Cw 1100.0 ug/L 8 2/14/2018< 1 0.5 Max. Pred Cw NO DETECTS ug/L9 2/7/2018 4 4.1 9 11/13/2019< 10 5 9 2/7/2018 550 550 9 3/6/2018 < 2 110 2/14/20185 4.7 10 11/14/2019< 10 5 10 2/14/2018680 680 10 4/3/2018 < 2 111 3/5/2018 8 8 11 11/15/2019< 10 5 11 3/5/2018 830 830 11 5/9/2018 < 1 0.512 3/6/2018 8 8.3 12 11/18/2019 < 10 5 12 3/6/2018 880 880 12 7/18/2018 < 1 0.513 3/7/2018 9 8.9 13 11/19/2019< 10 5 13 3/7/2018 740 740 13 10/17/2018< 1 0.514 3/8/2018 7 6.6 14 11/20/20195.5 5 14 3/8/2018 630 630 14 3/6/2019 < 2 115 3/9/2018 6 6.1 15 11/21/201910 10 15 3/9/2018 660 660 15 5/15/2019<2 116 4/3/2018 6 5.7 16 11/22/2019 < 10 5 16 4/3/2018 960 960 16 8/14/2019 < 2 117 4/4/2018 6 5.6 17 11/25/2019< 10 5 17 4/4/2018 890 890 17 9/10/2019<2 118 4/5/2018 6 6.1 18 11/26/2019< 10 5 18 4/5/2018 1000 1000 18 11/20/2019<2 119 5/9/2018 6 5.75 19 12/2/2019< 10 5 19 5/9/2018 960 960 1920 6/6/2018 6 6 20 12/3/2019< 10 5 20 6/6/2018 770 770 2021 6/12/20187 7.3 21 12/4/2019< 10 5 21 6/12/2018560 560 2122 6/14/20188 7.5 22 12/5/2019< 10 5 22 6/14/2018500 500 2223 7/11/20186 6.3 23 12/6/2019< 10 5 23 7/11/2018860 860 2324 7/18/20187 6.9 24 12/9/2019< 10 5 24 7/18/2018950 950 2425 8/8/2018 7 7 25 12/10/2019 < 10 5 25 8/8/2018 730 730 2526 9/11/20188 7.6 26 12/11/2019< 10 5 26 9/11/20181100 1100 2627 9/12/20187 7.1 27 12/12/2019< 10 5 27 9/12/2018950 950 2728 9/13/20188 7.6 28 12/13/2019< 10 5 28 9/13/20181100 1100 2829 10/3/20188 8 29 12/16/2019< 10 5 29 10/3/2018980 980 2930 10/17/20187 6.9 30 12/17/2019< 10 5 30 10/17/2018370 370 3031 11/7/2018 6 5.8 31 12/18/2019 < 10 5 31 11/7/2018 350 350 3132 12/4/2018 8 7.9 32 12/19/2019 < 10 5 32 12/4/2018 390 390 3233 12/5/2018 8 8.4 33 12/20/2019 < 10 5 33 12/5/2018 470 470 3334 12/6/2018 8 8.4 34 12/23/2019 < 10 5 34 12/6/2018 640 640 3435 1/9/2019 7 7.2 35 12/27/2019 < 10 5 35 1/9/2019 260 260 3536 2/6/2019 10 9.8 36 12/30/2019 < 10 5 36 2/6/2019 620 620 3637 3/6/2019 6 5.95 37 12/31/2019 < 10 5 37 3/6/2019 305 305 3738 3/12/2019 5 5.3 38 1/2/2020 < 10 5 38 3/12/2019 400 400 3839 3/14/2019 7 6.6 39 1/3/2020 < 10 5 39 3/14/2019 710 710 3940 4/3/2019 7 6.9 40 1/6/2020 < 10 5 40 4/3/2019 400 400 4041 5/8/2019 6 5.6 41 1/7/2020 < 10 5 41 5/8/2019 600 600 4142 5/15/2019 6 6 42 1/8/2020 < 10 5 42 5/15/2019 460 460 4243 6/5/2019 8 8.4 43 1/9/2020 < 10 5 43 6/5/2019 830 830 4344 6/11/2019 8 7.9 44 1/10/2020 < 10 5 44 6/11/2019 650 650 4445 6/13/2019 7 7.3 45 1/13/2020 < 10 5 45 6/13/2019 740 740 4546 7/3/2019 9 8.7 46 1/14/2020 < 10 5 46 7/3/2019 820 820 4647 8/7/2019 7 7.1 47 1/15/2020 < 10 5 47 8/7/2019 690 690 4748 8/14/2019 7 7.3 48 1/16/2020 < 10 5 48 8/14/2019 890 890 4849 9/10/2019 6 6.1 49 1/17/2020 < 10 5 49 9/10/2019 650 650 4950 9/11/2019 6 5.8 50 1/21/2020 < 10 5 50 9/11/2019 670 670 5051 9/12/2019 6 5.5 51 1/22/2020 < 10 5 51 9/12/2019 740 740 5152 10/9/2019 7 7 52 1/23/2020 < 10 5 52 10/9/2019 640 640 5253 11/6/2019 8 7.9 53 1/24/2020 < 10 5 53 11/6/2019 440 440 5354 11/20/2019 7 6.6 54 1/27/2020 < 10 5 54 11/20/2019 330 330 5455 12/3/2019 6 5.7 55 1/28/2020 < 10 5 55 12/3/2019 280 280 5556 12/4/2019 6 5.8 56 1/29/2020 < 10 5 56 12/4/2019 290 290 5657 12/5/2019 6 5.9 57 1/30/2020 < 10 5 57 12/5/2019 280 280 5758 1/8/2020 7 6.7 58 1/31/2020 < 10 5 58 1/8/2020 200 200 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58- 3 -RPA, data3/5/2020
REASONABLE POTENTIAL ANALYSISPar16 Par17 & Par18Par19Par20Molybdenum Nickel Selenium SilverDate Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results1 8/24/2016 14 14 Std Dev. 3.9454 1 8/24/2016 8.6 8.6 Std Dev. 5.9212 1 8/24/2016 < 1 0.5 Std Dev. 0.7670 1 9/14/2017 < 1 0.5 Std Dev. 0.00002 11/16/201611 11 Mean 8.2143 2 11/16/20167.3 7.3 Mean 9.1556 2 11/16/2016< 1 0.5 Mean 2.1667 2 10/4/2017 < 1 0.5 Mean 0.50003 3/8/2017 14 14 C.V. 0.4803 3 3/8/2017 8.9 8.9 C.V. 0.6467 3 3/8/2017 < 5 2.5 C.V. 0.3540 3 11/8/2017 < 1 0.5 C.V. 0.00004 6/7/2017 < 10 5 n 14 4 6/7/2017 6 6 n 18 4 6/7/2017 < 5 2.5 n 18 4 11/15/2017< 1 0.5 n 585 8/16/2017 11 11 5 8/16/2017 11 11 5 8/16/2017 < 5 2.5 5 12/5/2017 < 1 0.56 11/15/2017 13 13 Mult Factor =1.426 9/12/2017 8 8 Mult Factor =1.446 9/12/2017 < 5 2.5 Mult Factor =1.246 12/6/2017 < 1 0.5 Mult Factor =1.007 2/14/2018< 10 5 Max. Value 14.0 ug/L 7 11/15/20177.8 7.8 Max. Value 32.0 µg/L 7 11/15/2017< 5 2.5 Max. Value 2.5 ug/L 7 12/7/2017 < 1 0.5 Max. Value 0.500 ug/L8 5/9/2018 < 10 5 Max. Pred Cw 19.9 ug/L 8 2/14/20186.3 6.3 Max. Pred Cw 46.1 µg/L 8 2/14/2018< 5 2.5 Max. Pred CwNO DETECTS ug/L 8 1/10/2018< 1 0.5 Max. Pred Cw O DETECTS ug/L9 7/18/201812 12 9 3/6/2018 32 32 9 3/6/2018 < 5 2.5 9 2/7/2018 < 1 0.510 10/17/2018< 10 5 10 4/3/2018 < 10 5 10 4/3/2018 < 5 2.5 10 2/14/2018< 1 0.511 3/6/2019 < 10 5 11 5/9/2018 8.4 8.4 11 5/9/2018 < 5 2.5 11 3/5/2018 < 1 0.512 5/15/2019 < 10 5 12 7/18/2018 8.6 8.6 12 7/18/2018 < 1 0.5 12 3/6/2018 < 1 0.513 8/14/2019< 10 5 13 10/17/20187.8 7.8 13 10/17/2018< 5 2.5 13 3/7/2018 < 1 0.514 11/20/2019< 10 5 14 3/6/2019 5.5 5.5 14 3/6/2019 < 5 2.5 14 3/8/2018 < 1 0.51515 5/15/20196.4 6.4 15 5/15/2019< 5 2.5 15 3/9/2018 < 1 0.51616 8/14/2019 9.9 9.9 16 8/14/2019 < 5 2.5 16 4/3/2018 < 1 0.51717 9/10/201910 10 17 9/10/2019< 5 2.5 17 4/4/2018 < 1 0.51818 11/20/20197.3 7.3 18 11/20/2019< 5 2.5 18 4/5/2018 < 1 0.519191919 5/9/2018 < 1 0.520202020 6/6/2018 < 1 0.521212121 6/12/2018< 1 0.522222222 6/14/2018< 1 0.523232323 7/11/2018< 1 0.524242424 7/18/2018< 1 0.525252525 8/8/2018 < 1 0.526262626 9/11/2018< 1 0.527272727 9/12/2018< 1 0.528282828 9/13/2018< 1 0.529292929 10/3/2018< 1 0.530303030 10/17/2018< 1 0.531313131 11/7/2018 < 1 0.532323232 12/4/2018 < 1 0.533333333 12/5/2018 < 1 0.534343434 12/6/2018 < 1 0.535353535 1/9/2019 < 1 0.536363636 2/6/2019 < 1 0.537373737 3/6/2019 < 1 0.538383838 3/12/2019 < 1 0.539393939 3/14/2019 < 1 0.540404040 4/3/2019 < 1 0.541414141 5/8/2019 < 1 0.542424242 5/15/2019 < 1 0.543434343 6/5/2019 < 1 0.544444444 6/11/2019 < 1 0.545454545 6/13/2019 < 1 0.546464646 7/3/2019 < 1 0.547474747 8/7/2019 < 1 0.548484848 8/14/2019 < 1 0.549494949 9/10/2019 < 1 0.550505050 9/11/2019 < 1 0.551515151 9/12/2019 < 1 0.552525252 10/9/2019 < 1 0.553535353 11/6/2019 < 1 0.554545454 11/20/2019 < 1 0.555555555 12/3/2019 < 1 0.556565656 12/4/2019 < 1 0.557575757 12/5/2019 < 1 0.558585858 1/8/2020 < 1 0.5Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58- 4 -RPA, data3/5/2020
REASONABLE POTENTIAL ANALYSISPar21Par22Par23Zinc Bromodichloromethane DibromochloromethaneDate Data BDL=1/2DL Results Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results1 9/14/2017 55 55 Std Dev. 16.3593 1 9/18/20155.4 5.4 Std Dev. 1.5174 1 9/18/20152 2 Std Dev. 1.99422 10/4/2017 79 79 Mean 70.1207 2 6/8/2016 7.5 7.5 Mean 5.3750 2 6/8/2016 5.5 5.5 Mean 2.55003 11/8/2017 82 82 C.V. 0.2333 3 9/13/2017 4.5 4.5 C.V. (default) 0.6000 3 9/13/2017 1.5 1.5 C.V. (default) 0.60004 11/15/201772 72 n 58 4 3/6/2018 4.1 4.1 n 4 4 3/6/2018 1.2 1.2 n 45 12/5/2017 110 110 556 12/6/2017 99 99 Mult Factor =1.006 Mult Factor =2.596 Mult Factor =2.597 12/7/2017 85 85 Max. Value 110.0 ug/L 7 Max. Value 7.500000µg/L 7 Max. Value 5.500000µg/L8 1/10/201893 93 Max. Pred Cw 110.0 ug/L 8 Max. Pred Cw 19.425000µg/L 8 Max. Pred Cw 14.245000µg/L9 2/7/2018 83 83 9910 2/14/201888 88 101011 3/5/2018 89 89 111112 3/6/2018 100 100 121213 3/7/2018 100 100 131314 3/8/2018 75 75 141415 3/9/2018 76 76 151516 4/3/2018 77 77 161617 4/4/2018 81 81 171718 4/5/2018 79 79 181819 5/9/2018 92 91.5 191920 6/6/2018 53 53 202021 6/12/201862 62 212122 6/14/201864 64 222223 7/11/201875 75 232324 7/18/201872 72 242425 8/8/2018 55 55 252526 9/11/201863 63 262627 9/12/201860 60 272728 9/13/201888 88 282829 10/3/201860 60 292930 10/17/201850 50 303031 11/7/2018 48 48 313132 12/4/2018 61 61 323233 12/5/2018 54 54 333334 12/6/2018 57 57 343435 1/9/2019 41 41 353536 2/6/2019 62 62 363637 3/6/2019 33 32.5 373738 3/12/2019 47 47 383839 3/14/2019 45 45 393940 4/3/2019 71 71 404041 5/8/2019 63 63 414142 5/15/2019 48 48 424243 6/5/2019 70 70 434344 6/11/2019 53 53 444445 6/13/2019 61 61 454546 7/3/2019 72 72 464647 8/7/2019 65 65 474748 8/14/2019 57 57 484849 9/10/2019 65 65 494950 9/11/2019 70 70 505051 9/12/2019 64 64 515152 10/9/2019 76 76 525253 11/6/2019 83 83 535354 11/20/2019 67 67 545455 12/3/2019 67 67 555556 12/4/2019 78 78 565657 12/5/2019 79 79 575758 1/8/2020 94 94 5858Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58Use "PASTE SPECIAL-Values" then "COPY" . Maximum data points = 58- 5 -RPA, data3/5/2020
Monroe WWTP ≥Outfall 001
NC0024333 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 10.4 MGD
MAXIMUM DATA POINTS = 58
Qw (MGD) = 10.40 WWTP/WTP Class:IV COMBINED HARDNESS (mg/L)
1Q10S (cfs) = 0.36 IWC% @ 1Q10S = 97.81553398 Acute = 123.11 mg/L
7Q10S (cfs) = 0.43 IWC% @ 7Q10S = 97.40181269 Chronic = 122.83 mg/L
7Q10W (cfs) = 1.00 IWC% @ 7Q10W = 94.1588785
30Q2 (cfs) = 1.80 IWC% @ 30Q2 = 89.95535714
Avg. Stream Flow, QA (cfs) = 64.00 IW%C @ QA = 20.11982027
Receiving Stream:Stream Class:C
PARAMETER RECOMMENDED ACTION
Chronic Applied
Standard Acute n # Det.Max Pred Cw
Acute (FW):347.6
Arsenic C 150 FW(7Q10s)340 ug/L
18 0 NO DETECTS Chronic (FW):154.0
Max MDL = 5
Arsenic C 10 HH/WS(Qavg)ug/L Chronic (HH):49.7
Max MDL = 5
Acute:13.297
Cadmium NC 1.9621 FW(7Q10s)13.0062 ug/L 18 0 NO DETECTS
Chronic:2.014
Max MDL = 5
Acute:NO WQS
Chlorides NC 230 FW(7Q10s)mg/L 52 52 181.8
Chronic:236.1
No value > Allowable Cw
Acute:NO WQS
Total Phenolic Compounds NC 300 A(30Q2)ug/L 5 0 NO DETECTS
Note: n ≤ 9 Chronic:333.5
Limited data set Max MDL = 20
Acute:3,414.4
Chromium III NC 433.6373 FW(7Q10s)3339.8485 µg/L 0 0 N/A
Chronic:445.2
Acute:16.4
Chromium VI NC 11 FW(7Q10s)16 µg/L 0 0 N/A
Chronic:11.3
Chromium, Total NC µg/L 18 0 NO DETECTS
Max MDL = 5
Acute:48.08
Copper NC 30.7139 FW(7Q10s)47.0291 ug/L 58 58 9.80
Chronic:31.53
No value > Allowable Cw
Acute:22.5
Cyanide NC 5 FW(7Q10s)22 10 ug/L 58 2 10.0
Chronic:5.1
1 value(s) > Allowable Cw
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
a. No Monitoring required if all Total Chromium
samples are < the Chromium VI Allowable Cw
RP shown - apply Monthly Monitoring with Limit
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP , Predicted Max ≥ 50% of Allowable Cw -
apply Quarterly MonitoringPQLUNITSTYPE
(1)Allowable Cw
REASONABLE POTENTIAL RESULTSNC STANDARDS OR EPA CRITERIA
Richardson Creek HUC 03040105
Page 1 of 2
RPA, rpa
3/5/2020
Monroe WWTP ≥Outfall 001
NC0024333 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 10.4 MGD
Acute:NO WQS
Fluoride NC 1800 FW(7Q10s)ug/L 58 58 1,100.0
Chronic:1,848.0
No value > Allowable Cw
Acute:449.884
Lead NC 17.1062 FW(7Q10s)440.0562 ug/L 18 0 NO DETECTS
Chronic:17.563
Max MDL = 2
Acute:NO WQS
Molybdenum NC 2000 HH(7Q10s)ug/L 14 6 19.9
Chronic:2,053.3
No value > Allowable Cw
Acute (FW):1,320.2
Nickel NC 143.1547 FW(7Q10s)1291.3614 µg/L
18 17 46.1 Chronic (FW):147.0
No value > Allowable Cw
Nickel NC 25.0000 WS(7Q10s)µg/L Chronic (WS):25.7
1 value(s) > Allowable Cw
Acute:57.3
Selenium NC 5 FW(7Q10s)56 ug/L 18 0 NO DETECTS
Chronic:5.1
Max MDL = 5
Acute:4.702
Silver NC 0.06 FW(7Q10s)4.5997 ug/L 58 0 NO DETECTS
Chronic:0.062
Max MDL = 1
Acute:496.1
Zinc NC 488.3005 FW(7Q10s)485.2727 ug/L 58 58 110.0
Chronic:501.3
No value > Allowable Cw
Acute:NO WQS
Bromodichloromethane C 27 FW(7Q10s)µg/L 4 4 19.42500
Note: n ≤ 9 Default C.V.Chronic:27.72022
Limited data set No value > Allowable Cw
Acute:NO WQS
Dibromochloromethane C 21 FW(7Q10s)µg/L 4 4 14.24500
Note: n ≤ 9 Default C.V.Chronic:21.56017
Limited data set No value > Allowable Cw
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Limited Data Set (n < 8 samples); All values < 30% of
allowable discharge concentration; No monitoring
required.
Limited Data Set (n < 8 samples); All values < 30% of
allowable discharge concentration; No monitoring
required.
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No detects
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP , Predicted Max ≥ 50% of Allowable Cw -
apply Quarterly Monitoring
Page 2 of 2
RPA, rpa
3/5/2020
Monroe WWTP ≥Outfall 001
NC0024333 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 12.5 MGD
MAXIMUM DATA POINTS = 58
Qw (MGD) = 12.50 WWTP/WTP Class:IV COMBINED HARDNESS (mg/L)
1Q10S (cfs) = 0.36 IWC% @ 1Q10S = 98.17582974 Acute = 123.35 mg/L
7Q10S (cfs) = 0.43 IWC% @ 7Q10S = 97.8288311 Chronic = 123.12 mg/L
7Q10W (cfs) = 1.00 IWC% @ 7Q10W = 95.09202454
30Q2 (cfs) = 1.80 IWC% @ 30Q2 = 91.49940968
Avg. Stream Flow, QA (cfs) = 64.00 IW%C @ QA = 23.23838081
Receiving Stream:Stream Class:C
PARAMETER RECOMMENDED ACTION
Chronic Applied
Standard Acute n # Det.Max Pred Cw
Acute (FW):346.3
Arsenic C 150 FW(7Q10s)340 ug/L
18 0 NO DETECTS Chronic (FW):153.3
Max MDL = 5
Arsenic C 10 HH/WS(Qavg)ug/L Chronic (HH):43.0
Max MDL = 5
Acute:13.271
Cadmium NC 1.9656 FW(7Q10s)13.0286 ug/L 18 0 NO DETECTS
Chronic:2.009
Max MDL = 5
Acute:NO WQS
Chlorides NC 230 FW(7Q10s)mg/L 52 52 181.8
Chronic:235.1
No value > Allowable Cw
Acute:NO WQS
Total Phenolic Compounds NC 300 A(30Q2)ug/L 5 0 NO DETECTS
Note: n ≤ 9 Chronic:327.9
Limited data set Max MDL = 20
Acute:3,407.4
Chromium III NC 434.4716 FW(7Q10s)3345.2580 µg/L 0 0 N/A
Chronic:444.1
Acute:16.3
Chromium VI NC 11 FW(7Q10s)16 µg/L 0 0 N/A
Chronic:11.2
Chromium, Total NC µg/L 18 0 NO DETECTS
Max MDL = 5
Acute:47.99
Copper NC 30.7756 FW(7Q10s)47.1167 ug/L 58 58 9.80
Chronic:31.46
No value > Allowable Cw
Acute:22.4
Cyanide NC 5 FW(7Q10s)22 10 ug/L 58 2 10.0
Chronic:5.1
1 value(s) > Allowable Cw
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
a. No Monitoring required if all Total Chromium
samples are < the Chromium VI Allowable Cw
RP shown - apply Monthly Monitoring with Limit
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP , Predicted Max ≥ 50% of Allowable Cw -
apply Quarterly MonitoringPQLUNITSTYPE
(1)Allowable Cw
REASONABLE POTENTIAL RESULTSNC STANDARDS OR EPA CRITERIA
Richardson Creek HUC 03040105
Page 1 of 2
RPA, rpa
3/5/2020
Monroe WWTP ≥Outfall 001
NC0024333 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 12.5 MGD
Acute:NO WQS
Fluoride NC 1800 FW(7Q10s)ug/L 58 58 1,100.0
Chronic:1,839.9
No value > Allowable Cw
Acute:449.192
Lead NC 17.1497 FW(7Q10s)440.9975 ug/L 18 0 NO DETECTS
Chronic:17.530
Max MDL = 2
Acute:NO WQS
Molybdenum NC 2000 HH(7Q10s)ug/L 14 6 19.9
Chronic:2,044.4
No value > Allowable Cw
Acute (FW):1,317.6
Nickel NC 143.4392 FW(7Q10s)1293.5220 µg/L
18 17 46.1 Chronic (FW):146.6
No value > Allowable Cw
Nickel NC 25.0000 WS(7Q10s)µg/L Chronic (WS):25.6
1 value(s) > Allowable Cw
Acute:57.0
Selenium NC 5 FW(7Q10s)56 ug/L 18 0 NO DETECTS
Chronic:5.1
Max MDL = 5
Acute:4.701
Silver NC 0.06 FW(7Q10s)4.6153 ug/L 58 0 NO DETECTS
Chronic:0.061
Max MDL = 1
Acute:495.1
Zinc NC 489.2725 FW(7Q10s)486.0859 ug/L 58 58 110.0
Chronic:500.1
No value > Allowable Cw
Acute:NO WQS
Bromodichloromethane C 27 FW(7Q10s)µg/L 4 4 19.42500
Note: n ≤ 9 Default C.V.Chronic:27.59923
Limited data set No value > Allowable Cw
Acute:NO WQS
Dibromochloromethane C 21 FW(7Q10s)µg/L 4 4 14.24500
Note: n ≤ 9 Default C.V.Chronic:21.46606
Limited data set No value > Allowable Cw
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Limited Data Set (n < 8 samples); All values < 30% of
allowable discharge concentration; No monitoring
required.
Limited Data Set (n < 8 samples); All values < 30% of
allowable discharge concentration; No monitoring
required.
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No detects
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
No RP , Predicted Max ≥ 50% of Allowable Cw -
apply Quarterly Monitoring
Page 2 of 2
RPA, rpa
3/5/2020
3/16/20 WQS = 12 ng/L V:2013-6
Facility Name
/Permit No. :
Total Mercury 1631E PQL = 0.5 ng/L 7Q10s = 0.430 cfs WQBEL = 12.32 ng/L
Date Modifier Data Entry Value Permitted Flow = 10.400 47 ng/L
8/24/16 0.802 0.802
11/16/16 1.73 1.73 1.3 ng/L - Annual Average for 2016
3/8/17 1.66 1.66
6/7/17 0.888 0.888
8/16/17 2.91 2.91
9/12/17 1.51 1.51
11/15/17 1.31 1.31 1.7 ng/L - Annual Average for 2017
2/14/18 0.834 0.834
3/6/18 1.73 1.73
3/8/18 1.57 1.57
4/3/18 0.808 0.808
5/9/18 <0.5 0.5
7/18/18 1.95 1.95
10/17/18 0.952 0.952 1.2 ng/L - Annual Average for 2018
3/6/19 1.37 1.37
5/15/19 0.737 0.737
8/14/19 1.62 1.62
9/10/19 0.947 0.947
11/20/19 2.38 2.38 1.4 ng/L - Annual Average for 2019
Monroe WWTP/NC0024333 No Limit Required
MERCURY WQBEL/TBEL EVALUATION
MMP Required
Monroe WWTP/NC0024333
Mercury Data Statistics (Method 1631E)
2016 2017 2018 2019
# of Samples 2 5 7 5
Annual Average, ng/L 1.3 1.7 1.2 1.41
Maximum Value, ng/L 1.73 2.91 1.95 2.38
TBEL, ng/L
WQBEL, ng/L 12.3
47
NH3/TRC WLA Calculations
Facility: Monroe WWTP
PermitNo. NC0024333
Prepared By: Nick Coco
Enter Design Flow (MGD):10.4
Enter s7Q10 (cfs):0.43
Enter w7Q10 (cfs):1
Total Residual Chlorine (TRC)Ammonia (Summer)
Daily Maximum Limit (ug/l)Monthly Average Limit (mg NH3-N/l)
s7Q10 (CFS)0.43 s7Q10 (CFS)0.43
DESIGN FLOW (MGD)10.4 DESIGN FLOW (MGD)10.4
DESIGN FLOW (CFS)16.12 DESIGN FLOW (CFS)16.12
STREAM STD (UG/L)17.0 STREAM STD (MG/L)1.0
Upstream Bkgd (ug/l)0 Upstream Bkgd (mg/l)0.22
IWC (%)97.40 IWC (%)97.40
Allowable Conc. (ug/l)17 Allowable Conc. (mg/l)1.0
More stringent than current permit. Apply limit.Same as current permit limit. Maintain limit.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/l)
Fecal Coliform w7Q10 (CFS)1
Monthly Average Limit:200/100ml DESIGN FLOW (MGD)10.4
(If DF >331; Monitor)DESIGN FLOW (CFS)16.12
(If DF<331; Limit)STREAM STD (MG/L)1.8
Dilution Factor (DF)1.03 Upstream Bkgd (mg/l)0.22
IWC (%)94.16
Allowable Conc. (mg/l)1.9
Same as current permit limit. Maintain limit.
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)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non-Muni)

NH3/TRC WLA Calculations
Facility: Monroe WWTP
PermitNo. NC0024333
Prepared By: Nick Coco
Enter Design Flow (MGD):12.5
Enter s7Q10 (cfs):0.43
Enter w7Q10 (cfs):1
Total Residual Chlorine (TRC)Ammonia (Summer)
Daily Maximum Limit (ug/l)Monthly Average Limit (mg NH3-N/l)
s7Q10 (CFS)0.43 s7Q10 (CFS)0.43
DESIGN FLOW (MGD)12.5 DESIGN FLOW (MGD)12.5
DESIGN FLOW (CFS)19.375 DESIGN FLOW (CFS)19.375
STREAM STD (UG/L)17.0 STREAM STD (MG/L)1.0
Upstream Bkgd (ug/l)0 Upstream Bkgd (mg/l)0.22
IWC (%)97.83 IWC (%)97.83
Allowable Conc. (ug/l)17 Allowable Conc. (mg/l)1.0
More stringent than current permit. Apply limit.Same as current permit limit. Maintain limit.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/l)
Fecal Coliform w7Q10 (CFS)1
Monthly Average Limit:200/100ml DESIGN FLOW (MGD)12.5
(If DF >331; Monitor)DESIGN FLOW (CFS)19.375
(If DF<331; Limit)STREAM STD (MG/L)1.8
Dilution Factor (DF)1.02 Upstream Bkgd (mg/l)0.22
IWC (%)95.09
Allowable Conc. (mg/l)1.9
Same as current permit limit. Maintain limit.
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)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non-Muni)

NC0024333 Monroe WWTP 3/16/2020
Month RR (%)Month RR (%)Month RR (%)Month RR (%)
August-16 99.14 February-19 96.76 August-16 99.05 February-19 95.13
September-16 99.16 March-19 97.59 September-16 99.06 March-19 97.24
October-16 99.09 April-19 97.13 October-16 98.78 April-19 95.07
November-16 99.09 May-19 98.59 November-16 98.64 May-19 98.23
December-16 98.70 June-19 98.71 December-16 98.37 June-19 97.96
January-17 98.18 July-19 98.78 January-17 97.49 July-19 98.25
February-17 98.85 August-19 98.69 February-17 98.94 August-19 97.80
March-17 98.29 September-19 98.76 March-17 97.64 September-19 98.26
April-17 97.30 October-19 98.58 April-17 95.69 October-19 97.75
May-17 98.24 November-19 97.67 May-17 97.00 November-19 95.27
June-17 98.19 December-19 97.78 June-17 96.89 December-19 96.61
July-17 98.88 January-20 96.19 July-17 98.42 January-20 94.22
August-17 99.05 February-20 August-17 99.02 February-20
September-17 99.08 March-20 September-17 98.92 March-20
October-17 99.03 April-20 October-17 98.81 April-20
November-17 99.20 May-20 November-17 98.97 May-20
December-17 99.22 June-20 December-17 98.87 June-20
January-18 98.20 July-20 January-18 97.71 July-20
February-18 98.33 August-20 February-18 97.96 August-20
March-18 97.95 September-20 March-18 97.22 September-20
April-18 97.73 October-20 April-18 97.32 October-20
May-18 98.96 November-20 May-18 98.77 November-20
June-18 99.06 December-20 June-18 98.96 December-20
July-18 98.97 January-21 July-18 98.56 January-21
August-18 99.01 February-21 August-18 98.87 February-21
September-18 98.55 March-21 September-18 96.37 March-21
October-18 98.70 April-21 October-18 97.46 April-21
November-18 97.41 May-21 November-18 95.77 May-21
December-18 96.93 June-21 December-18 94.87 June-21
January-19 97.51 July-21 January-19 96.95 July-21
Overall BOD removal rate 98.36 Overall TSSD removal rate 97.60
BOD monthly removal rate TSS monthly removal rate
Start Date Q8800000 Upstream
Temperature [degC]
Q8820000
Downstream
Temperature [degC]
Temperature Difference
[degC]
2019-06-26 25.4 25.1 -0.3
2019-06-11 26.9 24.5 -2.4
2019-05-23 23.4 22.8 -0.6
2019-05-08 22.3 21.2 -1.1
2019-04-17 18.9 16.7 -2.2
2019-03-27 12.5 12.3 -0.2
2019-02-20 8.2 8.2 0
2019-01-16 6.6 7.2 0.6
2018-12-19 8.2 8.7 0.5
2018-11-28 7.7 8.2 0.5
2018-10-24 13.7 14.6 0.9
2018-09-28 24.9 25.1 0.2
2018-09-11 24.2 24.5 0.3
2018-08-21 24.6 24.8 0.2
2018-08-09 27.8 27.3 -0.5
2018-07-25 24.7 24.8 0.1
2018-07-10 23.2 23.8 0.6
2018-06-27 25.6 26 0.4
2018-06-12 23.2 23.6 0.4
2018-05-29 21.9 22.2 0.3
2018-05-08 18.2 18.4 0.2
2018-04-17 12.7 12.9 0.2
2018-03-13 7 7.1 0.1
2018-02-13 11.1 11.3 0.2
2018-01-16 3.4 3.7 0.3
2017-12-19 7.1 7.4 0.3
2017-11-28 5.1 5.4 0.3
2017-10-10 22.9 23.4 0.5
2017-09-27 23.2 23.5 0.3
2017-09-12 18.7 19.2 0.5
2017-08-23 26.1 26.5 0.4
2017-08-08 25.5 25.8 0.3
2017-07-26 27.9 28.2 0.3
2017-07-11 26.3 26.5 0.2
2017-06-28 21 21.1 0.1
2017-06-13 21.5 21.9 0.4
2017-05-31 21 21.2 0.2
2017-05-16 21.3 21.4 0.1
2017-04-18 19.1 19.6 0.5
NC0024333 Instream Temperature Summary
2017-03-21 9.6 10.2 0.6
2017-02-21 11.3 11.6 0.3
2017-01-24 10.1 10.3 0.2
2016-12-06 10.1 10.3 0.2
2016-11-09 16.1 16.2 0.1
2016-10-11 16.5 17.1 0.6
2016-09-28 23.9 24.2 0.3
2016-09-13 23.3 23.6 0.3
2016-08-31 23.8 24.2 0.4
2016-08-09 25.1 25.4 0.3
2016-07-27 27.4 27.7 0.3
2016-07-12 25 25.2 0.2
2016-06-29 23.3 23.9 0.6
2016-06-07 21.9 22.4 0.5
2016-05-26 19.8 21.1 1.3
2016-05-10 18.7 19 0.3
2016-04-26 16.7 16.9 0.2
2016-03-15 14.1 14.6 0.5
2016-02-16 6.3 6.4 0.1
2016-01-26 5.4 5.7 0.3
Average 18.3 18.5 0.2
Max 27.9 28.2 1.3
Min 3.4 3.7 -2.4
p-value > .05
Start Date Q8800000 Upstream
Conductivity [uS/cm]
Q8820000
Downstream
Conductivity [uS/cm]
2019-06-26 180 634
2019-06-11 148 275
2019-05-23 160 529
2019-05-08 152 396
2019-04-17 123 259
2019-03-27 122 320
2019-02-20 107 122
2019-01-16 94 178
2018-12-19 96 193
2018-11-28 108 234
2018-10-24 132 629
2018-09-28 139 454
2018-09-11 142 179
2018-08-21 147 177
2018-08-09 192 807
2018-07-25 177 206
2018-07-10 178 204
2018-06-27 152 216
2018-06-12 169 211
2018-05-29 162 219
2018-05-08 174 194
2018-04-17 147 214
2018-03-13 164 244
2018-02-13 153 211
2018-01-16 154 184
2017-12-19 147 204
2017-11-28 144 207
2017-10-10 166 234
2017-09-27 161 214
2017-09-12 188 279
2017-08-23 174 248
2017-08-08 168 221
2017-07-26 168 206
2017-07-11 156 179
2017-06-28 168 231
2017-06-13 158 221
2017-05-31 163 208
2017-05-16 249 263
NC0024333 Instream Conductivity Summary
2017-04-18 154 206
2017-03-21 159 225
2017-02-21 173 271
2017-01-24 188 281
2016-12-06 151 204
2016-11-09 160 209
2016-10-11 168 212
2016-09-28 181 310
2016-09-13 178 318
2016-08-31 171 312
2016-08-09 162 210
2016-07-27 137 168
2016-07-12 156 206
2016-06-29 162 319
2016-06-07 159 219
2016-05-26 144 139
2016-05-10 183 288
2016-04-26 178 283
2016-03-15 163 402
2016-02-16 153 322
2016-01-26 164 519
Average 158.1 271.6
Max 249 807
Min 94 122
p-value < .05
Start Date
Q8800000 Upstream
Fecal Coliform
[#/100ml]
Q8820000
Downstream Fecal
Coliform [#/100ml]
2019-06-26 151 200
2019-05-08 58 191
2019-04-17 58 131
2019-03-27 74 120
2019-02-20 2200 8000
2019-01-16 600 400
2018-12-19 78 96
2018-11-28 370 200
2018-10-24 80 230
2018-09-11 138 164
2018-08-21 136 210
2018-07-10 156 139
2018-06-12 80 68
2018-05-08 144 121
2018-04-17 148 130
2018-03-13 151 131
2018-02-13 92 74
2018-01-16 120 114
2017-12-19 84 100
2017-11-28 106 84
2017-10-10 200 116
2017-09-12 250 174
2017-08-08 260 220
2017-07-11 154 141
2017-06-13 151 138
2017-05-16 146 114
2017-04-18 210 144
2017-03-21 154 146
2017-02-21 143 108
2017-01-24 280 210
2016-12-06 210 134
2016-11-09 270 210
2016-10-11 240 200
2016-09-13 138 146
2016-08-09 118 149
2016-07-12 116 141
2016-06-07 130 98
2016-05-10 120 141
NC0024333 Instream Fecal Coliform Summary
2016-04-26 157 126
2016-03-15 169 220
2016-02-16 143 200
2016-01-26 156 210
Geomean 155.6 161.3
Max 2200 8000
Min 58 68
p-value < .05
Start Date
Q8800000
Upstream DO
[mg/L]
Q8820000
Downstream DO
[mg/L]
2019-06-26 5.7 5.1
2019-06-11 4.7 5.5
2019-05-23 2.7 5.8
2019-05-08 7.9 8
2019-04-17 6.1 6.6
2019-03-27 6.5 6.5
2019-02-20 9.8 9.6
2019-01-16 11 10.5
2018-12-19 8.2 7.9
2018-11-28 8.7 8.6
2018-10-24 5.9 7.5
2018-09-28 4.1 6.4
2018-09-11 6.3 6.5
2018-08-21 6.3 6.5
2018-08-09 3.8 5.1
2018-07-25 6.2 6.4
2018-07-10 6.3 6.6
2018-06-27 6.3 6.4
2018-06-12 6.3 6.4
2018-05-29 6.4 6.5
2018-05-08 6.5 6.4
2018-04-17 7.4 7.6
2018-03-13 8.7 9
2018-02-13 7.4 8
2018-01-16 9.8 10
2017-12-19 8.6 8.8
2017-11-28 8.3 8.7
2017-10-10 6.2 6.4
2017-09-27 6.2 6.4
2017-09-12 6.2 6.3
2017-08-23 6 6.1
2017-08-08 6.3 6.4
2017-07-26 6 6.2
2017-07-11 6.3 6.5
2017-06-28 6.6 6.7
2017-06-13 6.5 6.7
2017-05-31 6.5 6.6
2017-05-16 6.3 6.6
2017-04-18 6.4 6.4
NC0024333 Instream DO Summary
2017-03-21 8 9.2
2017-02-21 9.4 9.2
2017-01-24 8.3 8.7
2016-12-06 9.2 9.5
2016-11-09 6.9 7
2016-10-11 7.6 7.8
2016-09-28 6.3 6.6
2016-09-13 6.4 6.7
2016-08-31 6.3 6.4
2016-08-09 6.3 6.4
2016-07-27 6.1 6.2
2016-07-12 6.5 6.6
2016-06-29 6.5 6.6
2016-06-07 6.6 6.7
2016-05-26 6.5 6.9
2016-05-10 6.9 7.4
2016-04-26 7.4 7.5
2016-03-15 6.7 6.9
2016-02-16 9.6 9.7
2016-01-26 9.2 9.7
Average 6.9 7.2
Max 11 10.5
Min 2.7 5.1
p-value > .05
NPDES/Aquifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
Date of Request 3/6/2020
PERMIT WRITERS - AFTER you not this form back
Check all that
municipal renewal
apply
x
from PERCS:
Notify PERCS if LTMP/STMP data we said should b
on DMRs is not really there, so we can get it for you
(or NOV POTW).
- Notify PERCS if you want us to keep a specific POC
in LTMP/STMP so you will have data for next permit
renewal.
- Email PERCS draft permit, fact sheet, RPA.
- Send PERCS paper copy of permit (w/o NPDES
boilerplate), cover letter, final fact sheet. Email RPA if
changes.
Requestor
Nicholas Coco
new industries
Facility Name
Permit Number
Monroe W WTP
NCO024333
W WTP expansion
Speculative limits
Region
Mooresville
stream reclass.
Basin
Yadkin -Pee Dee River
outfall relocation
7Q10 change
other
other,
check applicable PERCS staff:
Other Comments to PERCS:
Facility is rated 10.4 MGD wtih 7 SIUs amd 7 CIUs listed in its application.
The facility, has an expansion tier to 12.5 MGD.
BIRD, CPF, CTB, FRB, TAR - Vivien Zhon 807-6310
CHO, HIW, LTN, LUM, NES, NEW, ROA, YAD
v
I - Monti Hassan (807-6314)
PERCS PRETREATMENT STAFF COMPLETES THIS PART:
Status of Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2 facility has no SIU's, does not have Division approved Pretreatment Program
facility has SIUs and DWQ approved Pretreatment Program (list "DEV" if program still under development)
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
Flow, MGD
Permitted
A u
Time period fo ual
STMP time frame:
Industrial
Most recent:
Uncontrollablel
n/a
Next Cycle:
-a
n
J
tl1
Parameter of
Concern (POC)
Check List
POC due to
NPDESI Non-
Disch Permit
Lima
Required by
EPA'
Required
by 503
Sludge-
POC du®
to Slu""
POTw POC
(Explain
below)""
STMP
Effluent
Freq
LTMP
Effluent
Freq
Q = Quarterly
M = Monthly
BOD
4
TSS
4
Q M
NH3
4
Q M
Arsenic
4
Q M
Cadmium
4
Q M
Chromium
4
Q M
Copper
4
Q M
C anide
4
Q M
Is all data on DMRs?
Lead
✓
4
Q M
YES
Mercury
{ /
4
Q M
NO (attach data)
Molybdenum
4
Q M
Nickel
4
Q M
"liver
t/'
4
Q M
Selenium
4
Q M
Zinc
4
Q M
Is data in spreadsheet?
Total Nitrogen
4
Q M
YES email to writer
Phosphorus
4 1
Q M I
NO
4 Q M
4 Q M
4 Q M
4 Q M
'Always in the LTMP/STMP " Only in LTMP/STMP if sludge land app or composts (dif POCs for incinerators)
"' Only in LTMP/STMP while SIU still discharges to POTW "" Only in LTMP/STMP when pollutant is still of concern to POTW
Comments to Permit Writer (ex., explanation of any POCs; info you have on IU related investigations Into NPDES Problems):
PERC NPDES_P Veat ntrequestform.may2016 (D0000005).xlsx
Revises: July 24, 2DD7

EPA
United States Environmental Protection Agency
Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 N 52 NC0024333 20/01/16 C S31112171819 20
21 66
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA ----------------------Reserved-------------------
3 N67707172 73 74 75 80
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Monroe WWTP
775 Treeway Dr
Monroe NC 28110
Entry Time/Date Permit Effective Date
Exit Time/Date Permit Expiration Date
10:04AM 20/01/16 14/09/01
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Kyle P Ketchum/ORC/704-282-4612/
Other Facility Data
12:24PM 20/01/16 19/01/31
Name, Address of Responsible Official/Title/Phone and Fax Number
Russell G Colbath,PO Box 69 Monroe NC 28111/Water Resources
Director/704-282-4624/7042825764
Contacted
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenance Records/Reports
Self-Monitoring Program Sludge Handling Disposal Facility Site Review Effluent/Receiving Waters
Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s)Agency/Office/Phone and Fax Numbers Date
Roberto Scheller DWR/MRO WQ/252-946-6481/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
W. Corey Basinger DWR/Division of Water Quality/704-235-2194/
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#1
NPDES yr/mo/day
20/01/16
Inspection Type
C3111218
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
NC0024333 17
Page#2
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
application?
Is the facility as described in the permit?
# Are there any special conditions for the permit?
Is access to the plant site restricted to the general public?
Is the inspector granted access to all areas for inspection?
Permit renewal received by Division July 31, 2018. Permit became effective September 1,
2014 and expired on January 31, 2019.
Comment:
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Facility appeared to be well operated and maintained. Sample analysis is performed by
on-site laboratory certification #206, Shealy Environmental Services (Certification #329).
Chronic Toxicity analysis performed by ETS. Process control, operation records, ORC log,
eDMR's, labatory analysis and COC's were reviewed.
Comment:
Pump Station - Effluent Yes No NA NE
Is the pump wet well free of bypass lines or structures?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Is SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Facility has two influent pump stations with a total of six influent pumps.Comment:
Equalization Basins Yes No NA NE
Is the basin aerated?
Is the basin free of bypass lines or structures to the natural environment?
Is the basin free of excessive grease?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Are audible and visual alarms operable?
Page#3
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Equalization Basins Yes No NA NE
# Is basin size/volume adequate?
At time of inspection the equalization basin was inspected for erosion, burrowing animals
and trees. Earthen berm appeared to be well vegetated and maintained. No erosion of
burrowing animals was noted on berm at time of inspection. A few saplings have taken
growth on berm.
Comment:
Bar Screens Yes No NA NE
Type of bar screen
a.Manual
b.Mechanical
Are the bars adequately screening debris?
Is the screen free of excessive debris?
Is disposal of screening in compliance?
Is the unit in good condition?
Facility has two rotary fine screens. Screenings are transfered to dumpster via augers with
finial disposal in landfill.
Comment:
Influent Sampling Yes No NA NE
# Is composite sampling flow proportional?
Is sample collected above side streams?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is sampling performed according to the permit?
At time of inspection influent sampler temperature was recorded 3 degrees Celsius.Comment:
Aeration Basins Yes No NA NE
Mode of operation Ext. Air
Type of aeration system Diffused
Is the basin free of dead spots?
Are surface aerators and mixers operational?
Are the diffusers operational?
Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin’s surface?
Page#4
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Aeration Basins Yes No NA NE
Is the DO level acceptable?
Is the DO level acceptable?(1.0 to 3.0 mg/l)
Comment:
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater?
Is the site free of excessive buildup of solids in center well of circular clarifier?
Are weirs level?
Is the site free of weir blockage?
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 ¼ of the sidewall depth)
At time of inspection sludge blanket was checked in one of four secondary clarifiers and was
recorded at approximately 1 foot.
Comment:
Pumps-RAS-WAS Yes No NA NE
Are pumps in place?
Are pumps operational?
Are there adequate spare parts and supplies on site?
Comment:
Filtration (High Rate Tertiary)Yes No NA NE
Type of operation:Down flow
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?
Page#5
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Filtration (High Rate Tertiary)Yes No NA NE
Filter backwashing at time of inspection.Comment:
Disinfection-Gas Yes No NA NE
Are cylinders secured adequately?
Are cylinders protected from direct sunlight?
Is there adequate reserve supply of disinfectant?
Is the level of chlorine residual acceptable?
Is the contact chamber free of growth, or sludge buildup?
Is there chlorine residual prior to de-chlorination?
Does the Stationary Source have more than 2500 lbs of Chlorine (CAS No. 7782-50-5)?
If yes, then is there a Risk Management Plan on site?
If yes, then what is the EPA twelve digit ID Number? (1000-____-____)1000 001 10435
If yes, then when was the RMP last updated?03/15/2018
Comment:
De-chlorination Yes No NA NE
Type of system ?
Is the feed ratio proportional to chlorine amount (1 to 1)?
Is storage appropriate for cylinders?
# Is de-chlorination substance stored away from chlorine containers?
Comment:
Are the tablets the proper size and type?
Are tablet de-chlorinators operational?
Number of tubes in use?
Comment:
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Page#6
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Effluent Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Facility is equipped with two effluent composite samplers. At time of inspection effluent
sampler #1 was recrded at 3.6 degrees Celsius and sampler #2 was recorded at 1 degree
Celsius.
Comment:
Flow Measurement - Effluent Yes No NA NE
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
At time of inspection effluent flow as noted at 5.9 MGD. Effluent was clear with no visible
suspended solids.
Comment:
Effluent Pipe Yes No NA NE
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly?
Facility has cascading step aeration before discharging into Richardson Creek. Small
amounts of foam was being generated at point of discharge but disipated within 60-80 feet
downstream.
Comment:
Aerobic Digester Yes No NA NE
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?
Facility has 2 sludge thickner tanks and 3 aerobic digester.Comment:
Solids Handling Equipment Yes No NA NE
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?
Page#7
Permit:NC0024333
Inspection Date:01/16/2020
Owner - Facility:
Inspection Type:
Monroe WWTP
Compliance Evaluation
Solids Handling Equipment Yes No NA NE
Is the site free of excessive moisture in belt filter press sludge cake?
The facility has an approved sludge management plan?
Belt thickner was in operation at time of inspection producing a thick, dry looking sludge
cake. Large amounts of dewater sludge is exposed to the weather in sludge holding area. It
is recommended that sludge holding area be covered to keep sludge dry and reduce
disposal weight. Sludge is being taken to landfill for final disposal.
Comment:
Drying Beds Yes No NA NE
Is there adequate drying bed space?
Is the sludge distribution on drying beds appropriate?
Are the drying beds free of vegetation?
# Is the site free of dry sludge remaining in beds?
Is the site free of stockpiled sludge?
Is the filtrate from sludge drying beds returned to the front of the plant?
# Is the sludge disposed of through county landfill?
# Is the sludge land applied?
(Vacuum filters) Is polymer mixing adequate?
Drying beds are being used as storage for dewatered sludge.Comment:
Standby Power Yes No NA NE
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?
Comment:
Page#8
Whole Effluent Toxicity Testing and Self Monitoring Summary Mocksville WWTP Dutchman's Cr.NC0021491/001chr lim: 37% @ 0.98 Ceri7dPFBegin:11/1/2014Freq:QJan Apr Jul OctNonComp:SingleCounty:DavieRegion:WSROBasin:YAD057Q10:2.54IWC:37.5SOC_JOC:PF:0.98JFMAMJJASOND2016 Pass‐‐Pass‐‐Pass‐‐Fail>74 >742017 Pass‐‐Pass‐‐Pass‐‐Pass‐‐2018 Fail 52.386Pass‐‐Pass‐‐Pass‐‐2019 Pass‐‐Pass‐‐Pass‐‐Pass‐‐Momentive (formerly Hexion)NC0003395/002Chr Lim:  4.7%Ceri7dPFBegin:9/1/2007Freq:QFeb May Aug NovNonComp:County:ColumbusRegion:WIROBasin:CPF177Q10:IWC:SOC_JOC:PF:JFMAMJJASOND2016‐Pass‐‐Pass‐‐Pass‐‐Pass‐2017‐Pass‐‐Pass‐‐H‐‐H‐2018‐H‐‐H‐‐H‐‐H‐2019‐H‐‐H‐‐H‐‐H‐Monroe WWTPNC0024333/001chr lim: 90% @10.4 Ceri7dPFBegin:9/1/2014Freq:QMar Jun Sep DecNonComp:SingleCounty:UnionRegion:MROBasin:YAD147Q10:0.43IWC:97.40SOC_JOC:PF:10.4JFMAMJJASOND2016‐‐Pass‐‐Pass >100(P)‐‐Pass‐‐Pass2017‐‐Pass‐‐>100(P) Pass‐‐Pass‐‐Pass2018‐‐>100(P) Fail>100>100Pass‐‐Pass‐‐Pass2019‐‐Pass‐‐Pass‐‐Pass‐‐>100(P) PassMontgomery County WTPNC0080322/001Chr Monit:  90%Ceri7dPFBegin:7/1/2014Freq:QJan Apr Jul OctNonComp:County:MontgomeryRegion:FROBasin:YAD087Q10:IWC:SOC_JOC:PF:0.470JFMAMJJASOND2016 Fail‐‐Pass‐‐Pass‐‐Pass‐‐2017 Fail‐‐Pass‐‐Pass‐‐Pass‐‐2018 Pass‐‐Pass‐‐Pass‐‐Fail‐‐2019 Pass‐‐Pass‐‐Pass‐‐Fail‐‐Moore County WWTPNC0037508/001chr lim: 41% or 50% Ceri7dPFBegin:12/1/2010Freq:QMar Jun Sep DecNonComp:SingleCounty:MooreRegion:FROBasin:LUM507Q10:15.2IWC:40.54SOC_JOC:PF:6.7JFMAMJJASOND2016‐‐Pass‐‐Pass‐‐Pass‐‐Pass2017‐‐Pass‐‐Pass‐‐Pass‐‐Pass2018‐‐Pass‐‐Pass >100(P)‐‐Pass‐‐Pass2019‐‐Pass‐‐Pass‐‐Pass‐‐Pass >100(P)Mooresville‐Rocky River WWTPNC0046728/001chr lim: <5.5 MGD @ Ceri7dPFBegin:4/1/2014Freq:QFeb May Aug NovNonComp:SingleCounty:IredellRegion:MROBasin:YAD117Q10:0.5IWC:94.15SOC_JOC:PF:5.5JFMAMJJASOND2016‐Pass‐‐Pass‐‐Pass >100(P)‐‐Pass >100(P)‐2017‐>100(P) Pass‐‐>100(P) Pass‐‐Pass‐‐Pass‐2018‐Pass‐‐Pass‐‐Pass‐‐Pass‐2019‐Pass‐‐Pass‐‐Pass‐‐Pass‐Page 67 of 109Legend:  P= Fathead minnow (Pimphales promelas), H=No Flow (facility is active), s = Split test between Certified Labs
MRs Between and Violation Category:Program Category:
Param Name County:Subbasin:%Violation Action:
Major Minor:%
Permit:
Facility Name:
Region:--NC0024333
%%
%
%
Limit Violation %
%
8 2016 2 2020
MONITORING REPORT(MR) VIOLATIONS for:03/03/20Report Date:1Page:of 1
PERMIT:NC0024333 FACILITY:City of Monroe - Monroe WWTP COUNTY:Union REGION:Mooresville
%
Over
UNIT OF
MEASURE VIOLATION ACTIONVIOLATION TYPECALCULATED
VALUELIMITFREQUENCYVIOLATION
DATEPARAMETERLOCATIONMONITORING
REPORT
Limit Violation
OUTFALL
12 - 2018 001 Effluent Flow, in conduit or thru
treatment plant
12/31/18 Continuous Monthly Average
Exceeded
Proceed to NOD12.5210.4mgd 20.4
2018 NC Category 5 Assessments "303(d) List" Final
Rocky SubbasinYadkin-Pee Dee River Basin 03040105
Richardson Creek13-17-36-(5)a1a
From Monroe Water Supply Dam (Lake Lee) to Mill Creek 13-17-36-10
Classification C Length or Area 8 Units FW Miles Previous AU Number
Assessment Criteria Status Reason for Rating Parameter of Interest Category
Exceeding Criteria Fair Benthos (Nar, AL, FW)5
Richardson Creek13-17-36-(5)a2
From Watson Creek to Salem Creek
Classification C Length or Area 5 Units FW Miles Previous AU Number
Assessment Criteria Status Reason for Rating Parameter of Interest Category
Exceeding Criteria Copper Dissolved Chronic (varies, AL, FW)5
Rocky River13-17a
From source to mouth of Reedy Creek
Classification C Length or Area 34 Units FW Miles Previous AU Number
Assessment Criteria Status Reason for Rating Parameter of Interest Category
Exceeding Criteria Fair Benthos (Nar, AL, FW)5
Rocky River13-17b1
From Clarke Creek to Mallard Creek
Classification C Length or Area 9 Units FW Miles Previous AU Number 13-17b
Assessment Criteria Status Reason for Rating Parameter of Interest Category
Exceeding Criteria Fair Benthos (Nar, AL, FW)5
Exceeding Criteria > 10% and >90 conf Turbidity (50 NTU, AL, FW miles)5
Page 258 of 2626/3/2019 2018 NC Category 5 Assessments "303(d) List" Approved by EPA May 22,2019