NC0069523_Draft Permit_20180725

ROY COOPER
NC
Governor
MICHAEL S. REGAN
Secretory LINDA CULPEPPER
Water Resources hoer nn Director
ENVIRONMENTAL QUALITY
July 25, 2018
Mr.Andrew Neff, Water &Wastewater Division Director
Union County Public Works
500 North Main Street, Suite 500
Monroe, NC 28112
Subject: Draft NPDES Permit NC0069523
Union County Public Works—Tallwood Estates WWTP
Union County
Dear Mr. Neff:
•
The Division has reviewed your request to renew the subject permit. Please review this draft carefully to
ensure a thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
> The daily average limit of dissolved oxygen in section A. (1)has been updated.
> Total mercury sampling has been added to A. (1) monitoring requirements.
> Section A. (3)has been added to explain the total mercury sampling frequency and measurement
method.
> Section A. (4)has been added to require electronic submission of effluent data. Federal regulations
require electronic submittal of all discharge monitoring reports (DMRs).
> Regulatory citations have been added to the permit.
Please note that the Clear Creek 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 Union County area,per EPA requirements. Please provide
your comments, if any,to the NPDES Program 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 the telephone number listed at the bottom of this page, or via e-mail [[e-mail]].
Sincerely,
y .. Lick
Yu
' -
Yu Liu
NPDES Program
cc: NPDES Files
ec: Maureen Kinney
Mooresville Regional Office
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,NC 27699-1617
Phone:[phone] Fax:[phone]
haps://deq.nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions 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,
Union County Public Works
are hereby authorized to discharge wastewater from a facility located at the
Tallwood Estates Wastewater Treatment Plant
4988 Brief Road (Off NCSR 1547)
Indian Trail
Union County
to receiving waters designated as Clear Creek in sub-basin 03-07-12 of 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.
This permit shall become effective.
This permit and authorization to discharge shall expire at midnight on October 31,
2023.
Signed this day.
DRAFT
Linda Culpepper, Interim Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
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.
Union County Public Works are hereby authorized to:
1. Continue to operate an existing 0.050 MGD wastewater treatment facility that
includes the following treatment units:
• 2 Influent pump stations
• Manual bar screen
• Equalization tank with diffused air
• 2 Aeration tanks
• 2 Clarifiers
• Aerated sludge holding chamber
• Tertiary disc filters
• UV disinfection chamber
• Backup chlorination
• Continuous flow recording device
• Standby power
This facility is located at the Tallwood Estates Wastewater Treatment Plant, 4988
Brief Road (off NCSR 1547), northwest of Brief, in Indian Trail, Union County.
2. Discharge from said treatment works at the location specified on the attached map
into Clear Creek, currently classified C waters in hydrologic unit 030401050306 of
the Yadkin-Pee Dee River Basin.
Page 2 of 7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 15A NCAC 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration,
the permittee is authorized to discharge from outfall 001. Such discharges shall be limited
and monitored) by the Permittee as specified below:
PARAMETER LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
[eDMR Code] Average Average Maximum , Frequency Type Location2'3
Flow [50050] 0.050 MGD Continuous Recording Influent or Effluent
BOD,5-day,20°C4 [C0310] 5.0 mg/L 7.5 mg/L Weekly Composite Effluent, Influent
(April 1 -October 31)
BOD,5-day,20°C4 [C0310] 10.0 mg/L 15.0 mg/L Weekly Composite Effluent, Influent
(November 1 -March 31)
Total Suspended Solids4 [C0530] , 30.0 mg/L 45.0 mg/L Weekly Composite Effluent, Influent
NH3 as N [C0610] 2.0 mg/L 6.0 mg/L Weekly Composite Effluent
(April 1-October 31)
as N [C0610] 4.0 mg/L 12.0 mg/L Weekly Composite Effluent
(November 1 -March 31)
Dissolved Oxygen [00300] Daily Average>_5.0 mg/L Weekly Grab Effluent
Fecal Coliform(geometric mean) 200/100 ml 400/100mI Weekly Grab Effluent
[31616]
Temperature(°C) [00010] Weekly Grab Effluent
Total Residual Chlorine5 [50060] 17 pg/L 2/Week Grab Effluent
Total Nitrogen(NO2+NO3+TKN)
[C0600] Quarterly Composite Effluent
Total Phosphorus [C0665] Quarterly Composite Effluent
pH [00400] - >_6.0 and<—9.0 standard units Weekly Grab Effluent
Mercury6,Total(as Hg) Monitor and report once during this Once per permit Grab Effluent
Concentration [COMER] permit cycle(ng/L)using Method 1631E cycle
Dissolved Oxygen [00300] Weekly Grab U, D
Temperature(°C) [00010] Weekly Grab U,D
•
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR
system [see A. (4)].
2. U-upstream at least 100 feet from outfall, D-downstream at least 300 feet from outfall.
3. Instream monitoring is provisionally waived while facility is a participant in the Yadkin Pee Dee
River Basin Association.
4. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15
percent of the respective monthly average influent value (85% removal).
5. Total Residual Chlorine monitoring requirements and limits are applicable only if chlorine
compounds are used for disinfection. See Condition A. (2.) for instructions should the facility's
permitted UV system fail and an alternate means of disinfection is required.
6. Compliance with this limit shall be determined in accordance with A. (3).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN
TRACE AMOUNTS.
Page 3 of 7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
A. (2) TEMPORARY MEANS OF DISINFECTION
[NCGS 143-215.1 (a)]
In the event that the wastewater treatment plant's ultraviolet (UV) disinfection system
should fail, underperform, or otherwise be removed from effective service, the
permittee or his agent should immediately inform the Surface Water Protection
Section staff of the Mooresville Regional Office of this development and discuss
temporary, alternate means for disinfection of the effluent.
If chlorine compounds are used as temporary means of disinfection, the total residual
chlorine (TRC) concentration of the effluent must be monitored on a daily basis while
this method of disinfection is in use and values must be reported on the discharge
monitoring report. TRC in the effluent may not exceed 17 µg/L; therefore,
dechlorination methods may also be necessary to ensure protection of water quality
in the receiving stream.
The Division shall consider all effluent TRC values reported below 50 µg/L to be in
compliance with the permit. However, the Permittee 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.
Use of a disinfection system other than the permitted UV system during
circumstances not deemed as emergency and/or temporary (replacement of lamps,
lamp cleaning or maintenance, etc.) will be considered a violation of the terms of this
permit. ,
A. (3) EFFLUENT MERCURY ANALYSIS
[G.S. 143-215.66]
The Permittee shall provide one effluent mercury-analysis, using EPA Method 1631E,
in conjunction with the next permit renewal application. The analysis should be
taken within 12 months prior to the application date. Any additional mercury effluent
mercury measurement conducted from the effective date of this permit and up to the
application date shall be submitted with the renewal application.
If the result of the mercury analysis is not provided with the application, the
application may be returned as incomplete and the Permittee considered non-
compliant.
Page4of7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
A. (4) 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. Reporting Requirements (Supersedes Section D. (2.) and Section E. (5.) (a)]
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. Until such time that the state's eDMR application is compliant with
EPA's Cross-Media Electronic Reporting Regulation (CROMERR), permittees will be
required to submit all discharge 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
1617 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 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 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.
Page 5 of 7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
Starting on December 21, 2020, 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:
http://www2.epa.gov/compliance/final-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 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
Page 6 of 7

Permit NC0069523
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
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.
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:
http://deo.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:
"I 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. (6.11
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].
Page 7 of 7 .

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Union County Public Works Facility
Tallwood Estates WWTP Location X
Latitude: 35°11'47"N Sub-Basin: 03-07-12
Longitude: 80°32'20"W Receiving Stream: Clear Creek
Permitted Flow:0.050 MGD Stream Class: C North NPDES Permit NC00069523

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
This form must be completed by Permit Writers for all expedited permits which do not require
full Fact Sheets. Expedited permits are generally simple 100%domestics (e.g., schools,mobile
home parks,etc)that can be administratively renewed with minor changes but can include
facilities with more complex issues(Special Conditions,303(d)listed water,toxicity testing,
instream monitoring, compliance concerns).
Basic Information for Expedited Permit Renewals
Permit Writer/Date Yu Liu 7/23/2018
Permit Number NC0069523
Facility Name Union County Public Works—Tallwood
Estates WWTP
Basin Name/Sub-basin number Yadkin-Pee Dee 03-07-12
Receiving Stream Clear Creek
Stream Classification in Permit C
Does permit need Daily Max NH3 limits? Already included
Does permit need TRC limits/language? Already included(UV with Cl backup)
Does permit have toxicity testing? No
Does permit have Special Conditions? Effluent Mercury Analysis required
Does permit have instream monitoring? Yes: Dissolved Oxygen&Temperature
Is the stream impaired(on 303(d)list)?For Yes: Turbidity
what parameter?
Any obvious compliance concerns? One enforcement during this permit cycle
Any permit mods since the last permit? No
New expiration date 10/31/2023
Changes to Draft Permit Updated D.O. limit; Added Mercury Sampling;
added eDMR requirement;Added regulatory
citations
Most Commonly Used Expedited Language:
• 303(d)language for Draft/Final Cover Letters: "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".
• TRC language for Compliance Level for Cover Letters/Effluent Sheet Footnote:
"The facility shall report all effluent TRC values reported by an NC certified laboratory
including field certified. However,effluent values below 50 µg/L will be treated as zero
for compliance purposes."
The dissolved oxygen limit in A(1)was updated to"Daily Average>5.0 mg/L".