NC0074772_Draft Permit_20200309

STATT
ROY COOPER `¢ '04 4%
Governor 47 Z _
MICHAEL S. REGAN n
t
. -1-'
Secretary
S. DANIEL SMITH
'vaDirector °
v
NORTH CAROLINA
Environmental Quality
March 9, 2020
Ms.Amanda Berger
Aqua North Carolina,Inc.
202 Mackenan Court
Cary,NC 27511
Subject: Draft NPDES Permit NC0074772
Diamond Head WWTP
Iredell County
Grade II Biological WPCS
Dear Permittee:
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:
• Updated facility component list to reflect one(1)aeration basin&one(1)clarifier(previously
had duel of each).
• Section A.(6.)has been updated to require electronic submission of effluent data.
reports(DMRs).Federal regulations require electronic submittal of all discharge
monitoring.
• An updated outfall map has been included.
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 fmal permit.If you have any questions concerning this permit,please contact
Emily Phillips at [e-mail] or(919) 707-3621.
Sincerely,
Emily Philli s
Compliance and Expedited Permitting Unit
cc: NPDES files
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,NC 27699-1617
919-807-6300 919-807-6389 FAX
https://deq.nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits

Permit NC0074772
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
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,
AQUA North Carolina, Inc.
is hereby authorized to discharge wastewater from a facility located at the
Diamond Head WWTP
799 Williamson Road, Mooresville
Iredell County
•
to receiving waters designated as Lake Norman (Reeds Creek Arm) in the Catawba River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III and IV hereof
This permit modification(MOD) shall become effective
This permit and authorization to discharge shall expire at midnight on March 31, 2025.
Signed this day.
S. Daniel Smith., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

Permit NC0074772
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.
AQUA North Carolina, Inc.
is hereby authorized to:
1. continue to operate an existing 0.0731 MGD wastewater treatment system utilizing the following
components:
• influent includes trucked-in filter backwash from potable-water treatment [ion-
exchange technology] from Subdivision water wells
• influent bar screen
• V-notch weir
• flow-equalization tank
• duel(2)aeration basins
• dual(2)clarifiers
• aerated sludge holding tank
• tertiary filters
• tablet chlorination and dechlorination
• post aeration
• flow recorder
• effluent pump station
• standby power generator
these facilities located at the Diamond Head WWTP,799 Williamson Road,near Mooresville,
Iredell County; and
2. discharge from said treatment works via Outfall 001, located on the attached map, into Lake
Norman(Reeds Creek Arm), stream index 11-(75),a waterbody currently classified WS-IV; B; CA
within subbasin 030832 [HUC: 03050101] of the Catawba River Basin; and
3. after receiving an Authorization to Construct(ATC)permit from the Division to expand flow(not
to exceed 0.100 MGD); and after submitting to the Division an Engineers Certification form
documenting that upgrades were completed in accord with this permit and the ATC,then
4. discharge from said treatment works via Outfall 001, located on the attached map, into Lake
Norman(Reeds Creek Arm), stream index 11-(75),a waterbody currently classified WS-IV; B; CA
within subbasin 03-08-32 [HUC: 03050101] of the Catawba River Basin.
Page 2 of 8

Permit NC0074772
Part I.
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade II Biological Water Pollution Control System 115A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until expansion above 0.0731
MGD,the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited, monitored
and reported 1 bythe Permittee as specified below:
P p
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
[Parameter Codes] Monthly Daily Measurement Sample Sample Average Maximum Frequency Type Location 2
Flow 50050 0. MGD Continuous Recordin I or E
0.100 100 MGD 3 g
Total Residual Chlorine(TRC) ' 50060 28 pg/L 2/Week Grab E
1 BOD,5 day(20°C) C0310 15.0 mg/L 22.5 mg/L Weekly Composite E
Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Weekly Composite E
Ammonia(NH3 as N) C0610 4.0 mg/L 20.0 mg/L Weekly Composite E
Dissolved Oxygen 00300 Daily Average>5.0 mg/L Weekly Grab E
pH 00400 Not<6.0 or>9.0 s. u. Weekly Grab E
Fecal Coliform(geometric mean) 31616 200/100 mL 400/100 mL Weekly Grab E
Temperature(°C) 00010 Weekly Grab E
Total Hardness—as[CaCO3 or 00900 Quarterly Composite E&U
(Ca+Mg)](mg/L)
Total Copper 01042 7.88 pg/L 10.47 pg/L Quarterly Composite E
Total Fluoride 00951 1,800 pg/L 1,800 pg/L Quarterly Composite E
Total Chloride 00940 230 pg/L 250 pg/L Quarterly Composite E
Total Zinc 01092 125.7 pg/L 125.7 pg/L Quarterly Composite E
Total Nitrogen(mg/L)s C0600 Monitor&Report Quarterly Composite E
(NO2+NO3+TKN)
Total Phosphorus(mg/L) C0665 Monitor&Report Quarterly Composite E
Combined radium 226 and 11503 5 pCi/L(annual average) Quarterly Composite E
_radium-228(pCi/L)6,7
Alpha emitters,excluding radon and 82077 15 pCi/L(annual average) Quarterly Composite E
uranium(pCi/L)6,7
Beta emitters,excluding potassium-40
and other naturally occurring 03520 50 pCi/L(annual average) Quarterly Composite E
radionuclides(pCi/L)6,7
Strontium-90(pCi/L)6,7 13501 30 pg//L(weekly average) Quarterly Composite E
Tritium(pCi/L)6,7 82126 20,000 pCi/L(annual average) Quarterly Composite E
Uranium(pg/L)7,6 22708 30 pg//L(weekly average) Quarterly Composite E
Chronic WET Testing 9 TGP3B Quarterly Grab E
See Footnotes,Page 4
Page 3 of 8

Permit NC0074772
Table A. (1.)Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using the Division's
electronic Discharge Monitoring Report System(eDMR)system [see A. (6)].
2. E=Effluent; I=Influent;U=Upstream
3. Discharge flow limit at 0.100 MGD is not permitted except after applying for, and receiving the
Division's Authorization to Construct(ATC)permit(see page 2 of 8).
4. The Division shall consider compliant all effluent TRC values reported below 50 µg/L. However,
the Permittee shall continue to record and submit all values reported by a North Carolina-
certified test methods(including field certified),even if these values fall below 50 µg/L.
5. For a given wastewater sample,TN=TKN+(NO2-N+NO3-N),where TN is Total Nitrogen
and TKN is Total Kjeldahl Nitrogen,and(NO2-N+NO3-N)is Nitrite/Nitrate Nitrogen.
6. If the quarterly value exceeds 4 times the annual average limit,then(a)the sampling frequency
shall increase to monthly and(b)a written notification shall be sent to the Water Quality
Permitting Section and the Mooresville Regional Office.
7. All quarterly samples shall be taken 72 to 80 hours after the introduction of offsite wastewater
into the equalization tank.If an introduction of offsite wastewater does not occur within a given
quarter,a sample shall be taken of the effluent and noted on the DMR as"No introduction of
offsite wastewater occurred for this quarter."
8. A quarterly value can be determined from one quarterly sample,or from the average of multiple
sample values,not to exceed seven(7)consecutive days, during a given quarter.
9. Chronic Toxicity [TGP3B] (Ceriodaphnia dubia) limited; effluent concentration at 90%during
the months of January,April,July and October[See A. (2.)].
Condition: The Permittee shall discharge no floating solids or foam visible in other than trace amounts.
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]
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,quarterly 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). 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.
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 on the Effluent Discharge
Monitoring Form(MR-1)for the months in which tests were performed,using the parameter code TGP3B for
the pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3 (original)is to be sent
to the following address:
Page 4 of 8

Permit NC0074772
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
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.
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. (3.) SPECIAL CONDITION—Operations
[G.S. 143-215.1C.]
(a) Inspect the performance of the plant's disinfection system every weekday and
maintain a log of such inspections; and
(b) Operate a Supervisory Control and Data Acquisition(SCADA)system at the plant.
A. (4.) SPECIAL CONDITION—Spill Notification
[G.S. 143-215.1C.]
(a) Contacting Public Health Directors
The facility must notify the Iredell and Mecklenburg County Public Health Directors within 12 hours of first
knowledge by the owner/operator of any discharge of untreated wastewater to waters of the State or a discharge
from the wastewater treatment plant that has not received adequate disinfection due to a malfunctioning
treatment unit.
Page 5 of 8

Permit NC0074772
The County Public Health Directors can be contacted using the following information:
Iredell County Health Director Mecklenburg County Health Director
318 Turnersburg Highway 249 Billingsley Road
Statesville,NC 28625 Charlotte,NC 28211
704-878-5300 704-336-4700
(b)Public Notification
The facility must notify the public of untreated wastewater spills. Wastewater facility owners or operators must
issue a press release after a discharge to surface waters of 1,000 gallons within 24 hours of first knowledge of
the spill by the owner/operator.The press release must be issued to"all electronic and print news media outlets
that provide general coverage in the county where the discharge occurred."A copy of the press release must be
maintained for one year by the owner/operator. This press release is required in addition to the permit
requirement of contacting the North Carolina Division of Water Resources(DWR).
If a discharge of 15,000 gallons or more reaches surface water,a public notice is required in addition to the
press release.The public notice must be placed in a newspaper having general circulation in the County in
which the discharge occurred and the county immediately downstream. The owner or operator shall publish the
notice within 10 days after the Secretary has determined the countries that are significantly affected by the
discharge and approved the form and content of the notice and the newspaper in which the notice is to be
published. At a minimum the notice should be published in a newspaper of general circulation in Iredell and
Mecklenburg Counties. If a discharge of 1,000,000 gallons of wastewater or more reaches surface waters,the
DWR regional office must be contacted to determine in what additional counties, if any, a public notice must be
published. A copy of these public notices and proof of publication must be sent to the DWR within 30 days of
publication. The copy should be sent to the following address:
Division of Water Resources
PERCS Unit
1617 Mail Service Center
Raleigh,NC 27699-1617
The minimum content of the notice is the location of the discharge,estimated volume,water body affected and
steps taken to prevent future discharges.
A. (5.) 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 fmal 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)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application.
Page 6 of 8

Permit NC0074772
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.
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 21,2020,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: https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-
discharge-el imination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
Page 7 of 8

Permit NC0074772
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
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.)
ll
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://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:
"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. lam 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.)1
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 8 of 8

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Latitude: 35°33' 52" Aqua North Carolina, Inc. Facility
Longitude: 80° 51' 58" *
Location
Stream Class: WS-IV, B; CA Diamond Head WWTP
Sub-basin: 03-08-32 NC0075205
Receiving Stream: Lake Norman
North Iredell County