NC0088200_Draft Permit_20190612

ROY COOPER
Governor
MICHAEL S. REGAN
Sect etarr
LINDA CULPEPPER
Director
NORTH Ct ROLINA
Envi*ronmenfalQuality
June 12, 2019
Mr. Kelly Craver, City Manager
City of Thomasville .
PO Box 368
Thomasville, NC 27361-0368
Subject: Draft NPDES Permit NCO088200
Thomasville WTP
Grade I Physical Chemical WPCS
Davidson County
Dear Mr. Craver:
The Division has reviewed your request to renew the subject permit. Please review this draft carefully
to ensure your thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
1. Language has been updated in Section A. (1) and Section A. (3) to require electronic submission
of effluent data. Federal regulations require electronic submittal of all discharge monitoring
reports (DMRs).
2. Outfall map has been updated.
3. Language on the Supplement to Permit Cover Sheet has been updated.
4. A components list has been added on the Supplement to Permit Cover Sheet based on the permit
renewal application.
5. Units of measure have been added in Section A. (1).
6. The facility grade has been added in Section A. (1).
7. Monitoring for turbidity has been reduced to monthly in Section A. (1) per the current water
treatment plant guidance.
8. Total Zinc monitoring has been added in Section A. (1) as the renewal application indicated that
zinc orthophosphate has the potential to be discharged, therefore monitoring is required per the
current water treatment plant guidance.
9. Limits have been added for total copper and monitoring has been increased to monthly based on
a reasonable potential to exceed water quality standards.
10. Updated footnotes in Section A. (1).
The 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
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-707-9000

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, has been added to this permit at a monitoring frequency of quarterly. See Section A.(L)
Effluent Limitations and Monitoring Requirements.
Please note that the practical quantitation limit (PQL) for Total Copper is 2 µg/L, and the PQL for Total
Zinc is 10 µg/L (per the Inorganic Chemistry Branch of the Division of Water Resources Water
Sciences Section) and monitoring data should be reportable down to these levels. Limits for water
treatment plants are determined by evaluating DMR data submitted to the Division, along with a dilution
factor (if applicable) and the maximum monthly average flow reported in the previous 3 years at the
time the review is completed.
Please note that the receiving stream is listed as an impaired waterbody on the North Carolina 303(d)
Impaired Waters List. Addressing impaired waters is a high priority with the Division, and instream data
will continue to be evaluated. If there is noncompliance with permitted effluent limits and stream
impairment can be attributed to your facility, then mitigative measures may be required.
With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Davidson County area, per EPA requirements.
Please provide your comments, if any, to me no later than 30 days after receiving 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 the draft, please
contact me at 919-707-3619, or via e-mail [[e-mail]].
Sincerely,
Brianna Yo
Compliance and Expedited Permitting Unit
cc: NPDES Files
Winston-Salem Regional Office
Wastewater Operator Certification Group
WSS/Aquatic Toxicology Branch

Permit NCO088200
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
POLLUTANT DISCHARGE ELIMINATIO
(NPDES)
In compliance with the provisions of North Carolina Geni
and regulations promulgated and adopted by the North CE
Commission, and the Federal Water Pollution Con/trol✓Ac
City of Thoqu
to receiving
Yadkin -Pee
as amended,
is hereby authorized to discharge wastewatdr ffr
Tho , asville°,WTF
t� \``,..
Old Lexingt� Roa
Th onaasville
Davidson County
4 � i
tern desi ated as anunn {amed-tributary\to,Ricb
e Basin,in acc\rdance with effluen limitations,
orth in Part's1.I. IL III a4W hereof.``.
This permit sha]
This permit and
Signed this day
-215.1, other lawful standards
mental Management
a facility located at the
Fork Creek in subbasin 03-07-07 of the
monitoring requirements, and other
to discharge shall expire at midnight on April 30, 2024.
Linda Culpepper
Director, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

Permit NCO088200
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this 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 a conventional water treatment
backwash generated during,the flocculation process
treatment plant currently has a design potable flo�wr
average wastewater discharge of approximately 0.4,
Thomasville WTP located on Old Lexington Road,
Wastewater treatment consists of:
2
• Alum sludge settling lagoon,
• Dechlorination
• Screen on discharge pipe (to
Discharge of filter-ba(
specified on the attacr
a waterbody currently
Pee D
map to
C
plant with a,discharge of wastewaters from filter
.and seltled\in sedimentation basins. This water
ate,of 6.0 MGD,and a maximum, monthly
1/4 MGD. This facility, is located at the City of
near Thomasville, in.Davidson County.
flow meter)
Er6m`said/1reatment`work9-via Outfall 001, at the location
ied�tributary to Rich�Eork Creek [Stream Index: 12-119-7],
in subba`sin 03-07-07 [HUC: 0304010302] of the Yadkin -
Page 2 of 7

Permit NCO088200
PART I.
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 0213.0400 et seq., 15A NCAC 02B.0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
Beginning with the effective date of this permit and lasting until expiration, the Permittee is authorized to
discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored' by the
Permittee as specified below:
EFFLUENT CHARACTERISTICS
Parameter Code
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow (MGD) 50050
Monitor & Report,'
\Continuous
Recording
Effluent
Total Suspended Solids C0530
30 mg/L ,-/
45lmg/L
�2/,Mbnth
Grab
Effluent
pH 00400
> 6A"and,< 9.0
standard\units
ti
2/Month',
Grab
Effluent
Total Residual Chlorine 2 50060
h`\'17,
lag/L�
�` ; 2/Month
`�� Grab
Effluent
Turbidity (NTU) 00070r'�
` �. `'`
'" Monthly
\ ;Grab
Effluent
Aluminum (lag/L) 01105
`--.�
\ `ti
Quarterly
Grab
Effluent
Total Copper 01042
10,45 Ng/L�
4.30 tag/\\
rt``��Monthly
Grab
Effluent
Fluoride (tag/L) ,-�—�----00951
\ �.�
> y' `,
`\Quuarterly
Grab
Effluent
Total Zinc (lag/L) 1-,'^'09692
\ \
/ ,/\
�. ,Quarterly
Grab
Effluent
Total Nitrogen (TN) (mg/L)\ \ C060}0
`
f
Quarterly
Grab
Effluent
Total Phosphorus (TP) (mg/L) \\,C0665
? -
Quarterly
Grab
Effluent
Total Hardness'(a`s CaCO3)•(mg/L) `\ 66900r
- �,Mbnitor &`Report
Quarterly
Grab
Effluent
Whole Effluent Toxicity Testing 3 , TGP38,
, Monitor & Report
Quarterly
Grab
Effluent
Footnotes:
1. The permittee s all submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see Section Ai (3)].
`
2. The Division shall consider all effluent TRC values reported below 50 µg/l to be in compliance with the
permit. However, the P,ennittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including,field certified), even if these values fall below 50 µg/l.
3. Ceriodaphnia dubia 7-day pass/fail test @ 90%. See Section A. (2) for toxicity testing requirements. Toxicity
testing should be performed during the months of January, April, July, and October.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS.
Page 3 of 7

Permit NCO088200
A. (2) CHRONIC TOXICITY MONITORING (QUARTERLY)
[15A NCAC 02B.0500 et seq.]
The permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent
versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The testing shall
be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be performed during the months
of January, April, July, and October. 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.
All toxicity testing results required as part of this permit conditidn will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month inrw iich it was performed, using the parameter code
TGP3B. Additionally, DWR Form AT-1 (original)'is to, ,be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences S \tion/A4u atic Toxicology,Branch
1621"Mai1 Service Center
Completed Aquatic Toxicity Test Forms shall'be filed with the Water,Sciences Section no later than 30
days after the end of the report ni g period for which the report i's•made\
Test data shall be complete and
performed in association iththe
of the effluent toxicity sampl°e.mi
the waste stream �'•
Should the be no discharge of
required, the�permittee will corn
form indicating It 6\facility namE
with the notation of "No Flow"
Water Sciences Section tithe ad
Should the permittee fail
monitoring will begin it
.rate and include-411 supporting chemical/physical measurements
�it'y tests, as\,veff as all dose/response data. Total residual chlorine
measured and reported if chlorine is employed for disinfection of
from
om the facility during a month in which toxicity monitoring is
the information located at the top of the aquatic toxicity (AT) test
,lit number, pipe number, county, and the month/year of the report
comment area of the form. The report shall be submitted to the
cited above.
a month in which toxicity monitoring is required, then monthly
submission of a valid test, this monthly test requirement will
revert to quarterly in the months -specified above.
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.
Page 4 of 7

Permit NCO088200
A. (3) ELECTRONIC REPORTING OF MONITORING REPORTS
[NCGS 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.) Reporting
• Section D. (6.) Records Retention '
• Section E. (5.) Monitoring Reports <
1. Renortin2 Reauirements [Suuersedes SectiodD. (2.) and Section\E.45.) (a
The permittee shall report discharge monitoring data electronically usinW g the NC DR's Electronic
Discharge Monitoring Report (eDMR) internet applic tion.
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 ntern-et. Until sucltime that the state's eDMR application
is compliant with EPA's Cross Media Electronic Reporting Regul'ation�(CROMERR), permittees will be
required to submit all dis hirg monitoring data to the state- electronically using eDMR and will be
required to complete the eDMR submission by printing, signing, and submitting one signed original and
a copy of the computer printed eDMR to\ the following address:
NC-DEQ /.Division�of-Water Resources /'\Water Quality Permitting Section
ATTENTION -Central. Files
16-17 Mail Service'Center,\
Raleigh, North Carolina 27699-=1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically to at d'in an area Here 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 s gned, copies shall be submitted to the mailing address above. 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, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 5 of 7

Permit NC0088200
• 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.federalreQister.Gov/documents/20i5/10/22/2015-24954/national-Dollutant-
aiscnarge-eiiminanon-s st�poes-eiectromeLreporting-rule.
Electronic submissions must start by the dates' fisted in the "Reportirig.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 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 `th,e 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:
hqp:Hdeq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)]
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B.
(11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting purposes.
Page 6 of 7

Permit NC0088200
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:
htti):Hdeg.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,qualifiedpersonnel 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 offines and imprisonment for knowing
violations. "
5. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Diseharge-Monitoring,keports, including eDMR submissions.
These records or copies shall be maintained, for a peridd,of at least 3. years from the date of the report.
This period may be extended by request of the, IDirector at anytime ['40 CFR 122.41].
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NMI
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