NC0024112_Draft Permit_20201222

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
December 22, 2020
Mr. Allen Beck, WWTP Superintendent
City of Thomasville
P.O Box 368
Thomasville, North Carolina 27361
Subject: Draft NPDES Permit Renewal
Permit NCO024112
Hamby Creek WWTP
Davidson County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Beck:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
Based on the reasonable potential analysis (RPA) showing no reasonable potential to violate
state water quality standards, the monitoring requirement for zinc has been removed from the
permit [See A. (1)].
Based on the reasonable potential analysis (RPA) showing reasonable potential to violate state
water quality standards, total copper limits have been added to the permit with a monthly
monitoring requirement [See A. (1)]. At the permittee's request, no compliance schedule has been
added.
Based on the reasonable potential analysis (RPA) predicting a maximum effluent nickel
concentration that is greater than half of the allowable discharge concentration based on state
water quality standards, quarterly monitoring for nickel has been added to the permit
[See A. (1)].
Based on Mercury TMDL evaluation showing mercury values reported non -detects at
< 200 ng/L and since the permitted flow is greater than 2 MGD, Special Condition A. (8.) Mercury
Minimization Plan has been continued in the permit.
The City of Thomasville reported Mercury at less than detection, with detection levels
< 200 ng/L in the Effluent Pollutant Scans and DMR results. The City's allowable discharge
concentration is 12.55 ng/L. DWR's laboratory identifies the target Practical Quantification
Limits (PQLs) for Mercury as 1.0 ng/L, using EPA low-level method 1631 E. 15A NCAC 2B
.0505 (e) (4) requires that all test procedures must produce detection and reporting levels that are
below the permit discharge requirements and all data generated must be reported to the approved
detection level or lower reporting level of the procedure. If no approved methods are capable of
achieving a detection level below the permit discharge requirement (or allowable discharge
concentration) the method with the lowest detection level must be used. The City should use
sufficiently sensitive test methods for all pollutants, including when performing Effluent
Pollutant Scans.
DE Q�� North Carolina Department of Environmental Quality I Division of Water Resources
_ 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA
oepad—t of E,W— ,eatai aual� 919.707.9000

• NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6, 2016 with some exceptions. The NC
Division of Water Resources NPDES Permitting Unit is required to implement the new dissolved
metal standards in all permits public noticed after April 6, 2016. The new standards for most
metals include acute standards. Further, the freshwater standards for several metals are expressed
as the dissolved form of the metals, and seven metals have hardness -dependent equations. As a
result, the NPDES Permitting Unit will need site -specific effluent hardness data and instream
hardness data, upstream of the discharge, for each facility monitoring these metals in order to
calculate permit limitations. Effluent hardness and instream hardness sampling, upstream of the
discharge, have been added to the permit at a monitoring frequency of quarterly [See A. (1.) and
A. (2.)].
• Some of the wording has changed in Special Condition A. (4.) — Chronic Toxicity Permit Limit
and Special Condition A. (5.) —Non-Detection Reporting and Determination of Compliance, please
review each paragraph carefully.
• Special Condition A. (6.) has been modified to include the specific three years in which the
Effluent Pollutant Scan shall be performed (2022, 2023, and 2024). In addition, at the end of the
Special Condition, 2nd species Toxicity Testing Requirements for municipal permit renewals per
Federal Regulations [40 CFR 122.210)(5)] have been added.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and program reports. The requirement to continue reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet
application has been added to your NPDES permit [See Special Condition A. (7.)].
A notation was made concerning the Electronic Reporting Rule —NPDES Electronic Reporting
Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21, 2025. The current
compliance date, effective January 4, 2021, was extended as a final regulation change published in
the November 2, 2020 Federal Register.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements [
See A. (1.)].
• Regulatory citations have been added to the permit.
• Because it appears piping from the facility to the Outfall location is greater than one mile, in
order to verify that the existing sample location is representative of the monitored activity, Special
Condition A. (10.) Demonstration of Representative Sampling has been added to the permit.
The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included
in this draft document (cover, map, and Part I). The conditions are the same as in your current
permit except that agency and division names have been updated. The latest version is available at
https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Davidson County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days
after receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit, please call me at [phone] or by email at [e-mail].
Page 2 of 3

Sincerely,
Cassidy Kurtz, Engineer
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR / Winston Salem Regional Office / Water Quality / Lon Snider
DWR / Operator Certification Program / Maureen Kinney
DWR / Ecosystems Branch / Mark Vander Borgh
DWR / Aquatic Toxicology Branch / Zach Thomas and Cindy Moore
Hamby Creek WWTP / Misty Conder
Page 3 of 3

Permit No. NCO024112
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
DRAFT PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission,
and the Federal Water Pollution Control Act, as amended, the
City of Thomasville
is hereby authorized to discharge wastewater from a facility located at the
Hamby Creek WWTP
110 Optimist Park Road
Davidson County
to receiving waters designated as Hamby Creek in the Yadkin -Pee Dee River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective Month DD, 2021.
This permit and the authorization to discharge shall expire at midnight on April 30, 2025.
Signed this day Month DD, 2021.
DRAFT
for S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management
Commission

Permit NCO024112
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of
this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements,
terms, and provisions included herein.
The City of Thomasville is hereby authorized to:
1. Continue to operate the existing 6.0 MGD wastewater treatment facility that includes
the following components:
➢ Influent filter screening equipment
➢ Solids classifier grit removal system
➢ Cannibal ® solids reduction system including interchange tanks
➢ 5-stage Bardenpho® oxidation system
➢ Three fine -bubble aeration basins
➢ Three secondary clarifiers
➢ Three disk filters
➢ UV disinfection
➢ Standby generator
This permitted facility is located at the Hamby Creek WWTP, 110 Optimist Park Road
near Thomasville in Davidson County.
2. Discharge treated wastewaters from said facility via outfall
currently classified C waters in the Yadkin -Pee Dee Rive
r
Page 2of13

Permit NCO024112
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System
[15A NCAC 08G .0302]
During the period beginning on the effective day of this permit and lasting until expiration, the Permittee shall be
authorized to discharge treated wastewater from Outfall 001 subject to the following effluent limitations and
monitoring' requirements:
PARAMETER
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Daily
Measurement
Sample
Sample
CHARACTERISTICS
Parameter Code
Average
Average
Maximum
Frequency
Type
Location
Flow 50050
6.0 MGD
Continuous
RecordingInfluent
or
Effluent
BOD.5-day, 20°C
C0310
4.0 mg/L
6.0 mg/L
Daily
Composite
Influent and
(April 1 — October 31) z
Effluent
BOD,5-day, 20°C
C0310
6.0 mg/L
9.0 mg/L
Daily
Composite
Influent and
November 1 — March 31 z
Effluent
Total Suspended Solids
C0530
30.0 mglL
45.0 mglL
Daily
Composite
Influent and
TSS z
Effluent
Ammonia (NH, as N) C0610
1.0 mg/L
3.0 mg/L
Daily
Composite
Effluent
(April 1 - October 31
Ammonia (NH, as N) C0610
3.0 mg/L
9.0 mg/L
Daily
Composite
Effluent
November 1 - March 31
Fecal Coliform (geometric 31616
200/100 mL
400/100 mL
Daily
Grab
Effluent
mean
Dissolved Oxygen 00300
Daily Average >_ 6.0 mg/L
Daily
Grab
Effluent
pH 00400
Between 6.0 and 9.0 standard units
Daily
Grab
Effluent
Temperature (°C) 00010
Monitor and Report
Daily
Grab
Effluent
C0665
Monitor and Report (mg/L)
Weekly
Composite
Effluent
Total Phosphorus
QM665
Monitor and Report (lb/month)
Monthly
Calculated
Effluent
Total Phosphorus 3 QS665
3,570 lb seasonal total
Seasonally
Calculated
Effluent
(April 1 — October 31
Total Phosphorus 3 QS665
5,040 lb seasonal total
Seasonally
Calculated
Effluent
November 1 — March 31
Total Nitrogen (TN) 4 C0600
Monitor and Report
Monthly
Composite
Effluent
m IL
Total Copper 5 01042
15.76 pg/L
22.31 pg/L
Monthly
Composite
Effluent
Total Nickel 5 01027
Monitor and Report
Quarterly
Composite
Effluent
Chronic Toxicity 6 TGP3B
Monitor and Report
Quarterly
Composite
Effluent
Effluent Pollutant Scan NC01
Monitor and Report
See Footnote 7
Effluent
Total Hardness [as 00900
Monitor and Report
Quarter' y
FComposite
Effluent
CaCO, m /L 8p
Footnotes-
1. Submit discharge monitoring reports electronically using the NC DWR's eDMR application system. See
section A. (7.).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 % of
the respective influent values (85% removal).
3. Monitoring for total phosphorus shall be conducted and calculated as prescribed above and in Special
Condition A. (3.).
(Footnotes Cont. on next page)
Page 3 of 13

Permit NCO024112
4. For a given wastewater sample, Total Nitrogen (TN) = TKN + (NO3-N + NO2-N) where TKN is Total
Kjeldahl Nitrogen, and (NO3-N + NO2-N) is Nitrate and Nitrite Nitrogen.
5. Monitoring for copper and Nickel shall coincide with Chronic Toxicity monitoring.
6. Chronic Toxicity (Ceriodaphnia dubia) P/F @ 90%; February, May, August, November; see Special
Condition A. (4.).
7. The permittee shall perform three Effluent Pollutant Scans throughout the term of this permit [See A. (6.)]
8. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent
metals (cadmium, copper, lead, nickel, silver, and zinc).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B .0500]
1. Beginning on the effective date of this permit and lasting through the expiration date, the Permittee
shall perform instream sampling upstream and downstream of Outfall 001 as specified below, unless
exempted per paragraph 2 below:
PARAMETERS
SAMPLE TYPE
MONITORING FREQUENCY
SAMPLE
LOCATION (1)
Jun 1 - Sep 30
Oct 1 - May 31
Temperature
Surface
3/week
Weekly
U, D
Dissolved Oxygen
Surface
3/week
Weekly
U, D
Fecal Coliform
(geometric mean)
Surface
3/week
Weekly
U, D
Conductivity
Surface
3/week
Weekly
U, D
Total Phosphorus
Surface
Monthly
Monthly
U, D
TKN
Surface
Monthly
Monthly
U, D
NH3-N, as N
Surface
Monthly
Monthly
U, D
NO2-N + NO3-N
Surface
Monthly
Monthly
U, D
Chlorophyll -a
Surface
Monthly
Monthly
D
Total Hardness (2)
Surface
Quarterly
Quarterly
U
Footnotes:
(1) Sample locations: U - Upstream at Baptist Children's Home Road, D - Downstream at SR
2017 and on Abbotts Creek at Center Street below the confluence with Leonard Creek.
(2) The permittee shall sample instream hardness upstream of the facility's discharge. The
sample shall be representative of the hardness in the receiving stream. If the permittee is a
member of a monitoring coalition program, sampling for instream hardness may be waived
as long as the monitoring coalition agrees to sample hardness at the nearest upstream
location, at a minimum frequency of quarterly, and the permittee has obtained approval from
DWR-NPDES Permitting Unit that the upstream station being monitored by the Coalition is
representative of the receiving stream for this discharge. The permittee is responsible for
Page 4of13

Permit NCO024112
submitting instream hardness test results with its permit renewal application package. If
Coalition membership is cancelled or the Coalition terminates instream hardness sampling
at the approved station, the permittee will immediately notify the Division and resume
sampling for instream hardness upstream of its discharge.
2. The Permittee shall be provisionally exempted from the instream monitoring requirements specified
in paragraph I above, so long as the Permittee remains a party in good standing of the Yadkin -Pee
Dee River Basin Association. If the Permittee's participation is terminated the permittee shall notify
the Division in writing within five (5) working days and the requirements in paragraph 1 shall be
reinstated.
Page 5 413

Permit NCO024112
A. (3.) TOTAL PHOSPHORUS MONITORING
[G.S. 143-215.1(b)]
The Permittee shall calculate the seasonal mass loading of total phosphorus as the sum of monthly
loadings, according to the following equations:
Monthly Mass Loading (pounds/month) = TP x Q x 8.34
where: TP = the average total phosphorus concentration (mg/L) of the
composite samples collected during the month
Q = the total volume of wastewater discharged during the month
at each outfall (MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
Seasonal Mass Loading (pounds/season) _ Y_ (Monthly Mass Loadings) for the season
The Permittee shall report the total phosphorus concentration for each sample and the monthly mass
loading in the appropriate self -monitoring report and the seasonal mass loading of total phosphorus in the
final self -monitoring report for the season.
A. (4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterlX monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent versions
or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised- December 2010) or
subsequent versions. The tests will be performed during the months of February, May,
August, and November. These months signify the first month of each three-month toxicity testing quarter
assigned to the facility. Effluent sampling for this testing must be obtained during representative effluent
discharge and shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed, using the parameter code TGP311 for the
pass/fail results and THP311 for the Chronic Value. Additionally, DWR Form AT-3 (original) is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Or, results can be sent to the email, ATForms.ATBkncdenr.gov.
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after
the end of the reporting period for which the report is made.
Page 6 of 13

Permit NCO024112
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the Permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the
facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No
Flow" in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month. Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three month time interval that begins on the first day of the month in which toxicity testing is
required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute
an invalid test and will require immediate follow-up testing to be completed no later than the last day of the
month following the month of the initial monitoring.
A. (5.) NON -DETECTION REPORTING AND DETERMINATION OF COMPLIANCE
When pursuant to this permit a pollutant analysis is conducted using an approved analytical protocol with
the appropriate minimum detection level and a result of "non -detectable" or "below quantitation limit" is
obtained, the Permittee shall record that result as reported. For the purpose of determining compliance
with a permit limit for the pollutant, the numerical value of that individual analytical result shall be zero;
provided that the permittee identified in the comments section of the DMR the PQL and method used and
the number of times a "zero' was used in the calculation.
Page 7 of 13

Permit NC0024112
A. (6.) EFFLUENT POLLUTANT SCAN (Municipal POTWs)
[G. S. 143-215.1(b)]
a. The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One
scan must be performed in each of the following years: 2022, 2023, and 2024. Analytical methods shall
be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters
are present in concentrations greater than applicable standards and criteria. Samples should be collected
with one quarterly toxicity test each year, and must represent seasonal variation [i.e., do not sample in the
same quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total recoverable."
Ammonia (as N)
CO610
Trans-1,2-dichloroethylene
34546
Bis (2-chloroethyl) ether
34273
Chlorine (total residual, TRC)
50060
1, 1 -dichloroethylene
34501
Bis (2-chloroisopropyl) ether
34283
Dissolved oxygen
00300
1,2-dichloropropane
CO541
Bis (2-ethylhexyl) phthalate
C0100
Nitrate / Nitrite
00630
1,3-dichloropropylene
77163
4-bromophenyl phenyl ether
34636
Kjeldahl nitrogen
00625
Ethylbenzene
34371
Butyl benzyl phthalate
34292
Oil and grease
00556
Methyl bromide
34413
2-chloronaphthalene
34581
Phosphorus
CO665
Methyl chloride
34418
4-chlorophenyl phenyl ether
34641
Total dissolved solids
70295
Methylene chloride
34423
Chrysene
34320
Hardness
00900
1,1,2,2-tetrachloroethane
81549
Di-n-butyl phthalate
39110
Antimony
01097
Tetrachloroethylene
34475
Di-n-octyl phthalate
34596
Arsenic
01002
Toluene
34010
Dibenzo(a,h)anthracene
34556
Beryllium
01012
1,1,1-tichloroethane
34506
1,2-dichlorobenzene
34536
Cadmium
01027
1,1,2-tichloroethane
34511
1,3-dichlorobenzene
34566
Chromium
CO034
Trichloroethylene
39180
1,4-dichlorobenzene
34571
Copper
01042
Vinyl chloride
39175
3,3-dichlorobenzidine
34631
Lead
01051
Acid -extractable compounds:
Diethyl phthalate
34336
Mercury (Method 1631 E)
COMER
P-chloro-m-cresol
34452
Dimethyl phthalate
34341
Nickel
01067
2-chlorophenol
34586
2,4-dinitrotoluene
34611
Selenium
01147
2,4-dichlorophenol
34601
2,6-dinitrotoluene
CO626
Silver
01077
2,4-dimethylphenol
34606
1,2-diphenylhydrazine
34346
Thallium
01059
4,6-dinitro-o-cresol
34657
Fluoranthene
CO376
Zinc
01092
2,4-dinitrophenol
34616
Fluorene
34381
Cyanide
00720
2-nitrophenol
34591
Hexachlorobenzene
CO700
Total phenolic compounds
32730
4-nitrophenol
34646
Hexachlorobutadiene
CO702
Volatile organic compounds:
Pentachlorophenol
39032
Hexachlorocyclo-pentadiene
34386
Acrolein
34210
Phenol
34694
Hexachloroethane
34396
Acrylonitrile
34215
2,4,6-trichlorophenol
34621
Indeno(1,2,3-cd)pyrene
34403
Benzene
34030
Base -neutral compounds:
Isophorone
34408
Bromoform
32104
Acenaphthene
34205
Naphthalene
34696
Carbon tetrachloride
32102
Acenaphthylene
34200
Nitrobenzene
34447
Chlorobenzene
34301
Anthracene
CO220
N-nitrosodi-n-propylamine
34428
Chlorodibromomethane
34306
Benzidine
39120
N-nitrosodimethylamine
34438
Chloroethane
85811
Benzo(a)anthracene
CO526
N-nitrosodiphenylamine
34433
2-chloroethyl vinyl ether
34576
Benzo(a)pyrene
34247
Phenanthrene
34461
Chloroform
32106
3,4 benzofluoranthene
34230
Pyrene
34469
Dichlorobromomethane
32101
Benzo(ghi)perylene
34521
1,2,4-trichlorobenzene
CO551
1,1-dichloroethane
34496
Benzo(k)fluoranthene
34242
1,2-dichloroethane
32103
Bis (2-chloroethoxy) methane
34278
i. Reporting. Test results shall be reported electronically using the Divisions eDMR system
or on DWR Form DMR-PPA-1(or on a form approved by the Director) by December 315t of
each designated sampling year.
ii. The Permittee must at least report completion of the test in the eDMR system by entering 66
1" or "Y"
for parameter code NCO - Annual Pollutant Scan. If utilizing the DWR Form submit to the
following address:
Page 8 of 13

Permit NCO024112
NC DEQ / DWR / NPDES Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Or the form may be uploaded at: hgps:Hedocs.deq.nc.gov/Forms/NPDES_WW-EDMR-Supplemental-
Form
b. Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal
facilities that are subject to the Effluent Pollutant Scan requirements listed above are also subject to
additional toxicity testing requirements specified in Federal Regulation 40 CFR 122.210)(5). The US
EPA requires four (4) toxicity tests for a test organism other than the test species currently required in this
permit. The multiple species tests should be conducted either quarterly for a 12-month period prior to
submittal of the permit renewal application, or four tests performed at least annually in the four and one
half year period prior to the application. These tests shall be performed for acute or chronic toxicity,
whichever is specified in this permit. The multiple species toxicity test results shall be filed with the
Aquatic Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Or, results can be sent to the email, ATForms.ATB(a�ncdenr.gov.
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E
(Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal
application to the NPDES Permitting Unit.
A. (7.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December
21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. The eDMR system may be
accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr.
Page 9 of 13

Permit NCO024112
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access, then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or
alternative forms approved by the Director. Duplicate signed copies shall be submitted to the
following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See "How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Sewer Overflow/Bypass Event Reports;
Pretreatment Program Annual Reports; and
Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: https://www.federalre ig ster.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to
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Permit NC0024112
the Division. Requests for temporary electronic reporting waivers must be submitted in writing to
the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data
and reports shall be submitted electronically to the Division unless the permittee re -applies for and is
granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request may
submit monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (I I.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (I 1.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit
the following web page:
hLtp://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
7 certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the information,
the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations. "
5. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
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Permit NCO024112
A. (8.) MERCURY MINIMIZATION PLAN (MMP)
[G.S. 143-215.1(b)]
The permittee shall continue to implement the mercury minimization plan during this permit term. The
MMP shall be available for inspection on -site. A sample MMP was developed through a stakeholder
review process and has been placed on the Division website for guidance
(http://portal.ncdenr.org/web/wq/swp/ps/npdes, under Model Mercury Minimization Plan). The MMP
should place emphasis on identification of mercury contributors and goals for reduction. Results shall
be summarized and submitted with the next permit renewal.
A. (9.) COPPER REOPENER
[G.S. 143-215.1(b)]
The Division may reopen this permit to implement revised copper limits or other measures when a
TMDL is developed and approved for the copper impairment in Hamby Creek.
A. (10.) DEMONSTRATION OF REPRESENTATIVE SAMPLING (Fecal Coliform, Dissolved
Oxygen & pH Sampling) [G.S. 143-215.1(b); 40 CFR 122.410)]
1. The Permittee shall conduct investigative grab sampling for dissolved oxygen, fecal coliform and
pH in the vicinity of the receiving stream Outfall 001 in conjunction with effluent sampling
conducted at the existing effluent sampling location.
2. A study plan for the additional sampling with the proposed location of the grab sample point
should be provided within 90 days from the permit effective date. Once approved, this study plan
should be used for these analyses. Sampling shall be conducted in accordance with monitoring
frequencies as identified in Section A.(L) and for a period of 2 months during the Winter season
(November 1 — March 31) and 2 months during the Summer season (April 1 — October 31). The
sampling should be conducted on the same day and close enough together in time to be
reasonably comparable.
3. Within 12 months of the effective date of the permit, the Permittee shall submit to the Division a
report summarizing the data results. A comparison of the effluent data and the alternative
sampling point should be conducted by the permittee.
4. Should the existing sampling location for fecal coliform, dissolved oxygen and pH be considered
unrepresentative; there is a statistically significant difference in the results (between locations
001 and 001B) with respect to the receiving stream, the Permittee shall identify and sample at a
location that is representative. This change once approved, will be incorporated in the permit as a
minor modification.
For e-DMR reporting, monitoring stations will be reported under the following outfalls:
LOCATION
REPORTING OUTFALL
001
Existing Effluent Sampling Location
001B
Study Sampling Location
Page 12of13

Permit NCO024112
800 j
/V7, Hamby Creek WWTP
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kp
14 1
12
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Outfall 001 I J J.
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Hamby Creek WWTP — NCO024112 Facility Location (not to scale)
City of Thomasville, Davidson County
Receiving Stream: Hamby Creek Stream Class: C x
Drainage Basin: Yadkin -Pee Dee Sub -Basin: 03-07-07 N
HUC: 03040103 Permitted Flow: 6 MGD
State Grid/USGS Quad: Fair Grove Latitud
Page 13 of 13