NC0074772_Draft Permit_20180207

Water Resources
ENVIRONMENTAL QUALITY
ROY COOPER
Governor
MICHAEL S REGAN
Secretory
LINDA CULPEPPER
hetet m2 Dn ectot
February 7, 2018
Shannon V. Becker, President
AQUA North Carolina, Inc
202 MacKenan Court
Cary, North Carolina 27511
Subject: Review of DRAFT - Modification
to Extend the Limit Deadline for Copper
NPDES Permit NCO074772
Diamond Head Subdivision WWTP, Grade WW -2
799 Williamson Road, Mooresville
Iredell County
Dear Mr Becker:
In response to your request to modify the subject permit, the Division of Water Resources (the Division)
offers this draft for your review and comment. Please review the attached change -pages [3 thru 8] to insure
your understanding of the revised limits and monitoring conditions.
Modification Changes In accord with your request of November 27, 2017, we have extended to the end of this
permit cycle, the deadline to comply with Total Copper limits. Your compliance to Total Copper limits begins on
the April 1, 2020. Please note that you are responsible to comply with all parameter limits except Total Copper
beginning on the effective date of this permit modification, when issued.
Concurrent with this notification, the Division will solicit public comment on this draft modification by
publishing a notice in newspapers having circulation in the general Iredell County area, as required by the
NPDES Program. Please provide your written comments, if any, to me via email [e-mail]], or
write to my attention care of NCDEQ / DWR / NPDES Program no later than March 9, 2018, approximately 30
days after receiving this letter Your wntten comments are welcome, but are not mandatory.
If you have questions about this modification, or if I can further assist you, please contact me at
[Joe corporonAncdenr.gov] or call my direct line [phone].^ z7
�pec>: iiy, v
J ron G
ompliance a Expedite ermitting
Enclosure: NPDES Permit NCO074772 (modificatio change -pages thru 8)
he Central Files
NPDES Program Files
ec MRO/SWPS, Corey Basinger, Supervisor
OCU, Maureen Kinney
ATB, Susan Meadows, Cindy Moore
AQUA, Laune Ison [LTIson@aquaamenca com]
State of North Carolina I Environmental Quality I Water Resources
1611 Mail service Center I Raleigh, North Carolina 27699-1611
919 707 9000

Shannon V. Becker
AQUA Diamond Head WWTP, NC0074772,
February 7, 2017
Page 2
[see attached modification changes]

Permit NCO074772
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
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 by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
[Parameter Codes]
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location 2
Flow
50050
0 0731 MGD
0 100 MGD 3
Continuous
Recording
I or E
Total Residual Chlorine 4
50060
28 µg/L
2/Week
Grab
E
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
(Ca + Mg)] (mg/L)
00900
Quarterly
Composite
E & U
Total Copper
01042
7.88 µg/L 5
10.47 µg/L 5
Quarterly
Composite
E
Total Fluoride
00951
1,800 µg/L
1,800 µg/L
Quarterly
Composite
E
Total Chloride
00940
230 mg/L
250 mg/L
Quarterly
Composite
E
Total Zinc
01092
125.7 µg/L
125 7 µg/L
Quarterly
Composite
E
Total Nitrogen (mg/L) 6
(NO2+ NO3 + TKN)
C0600
Monitor & Report
Quarterly
Composite
E
Total Phosphorus (mg/L)
C0665
Monitor & Report
Quarterly
Composite
E
Combined radium -226 and
radium -228 (pCi/L) 7,8
11503
5 pCi/L (annual ave.)
Quarterly
Composite
E
Alpha emitters, excluding radon and
uranium (pCi/L) 7,8
82077
15 pCi/L (annual ave)
Quarterly
Composite
E
Beta emitters, excluding potassium -
40 and other naturally occurring
radionuclides (pCi/L) 7, 8
03520
50 pCi/L (annual ave.)
Quarterly
Composite
E
Tritium (pCi/L) 718
82126
20,000 pCi/L (annual ave.)
Quarterly
Composite
E
Strontium -90 (pCi/L) 7,8
13501
8 pCi/L (annual ave.)
Quarterly
Composite
E
Uranium (µg/L) 7, 8, 9
22708
30 µg/2 (weekly ave.) 9
Quarterly
Composite
E
Whole Effluent Toxicity (WET) 10
TGP3B
Quarterly
Grab
E
See Footnotes, Page 4
Page 3 of 8

Permit NCO074772
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 at 0.100 MGD is permitted only after applying for, and receiving the Division's
Authorization to Construct (ATC) permit and submitting Engineers Certification form (see
page 2 of 8).
4. The Division shall consider compliant all effluent TRC values reported below 50 gg/L. However,
the Permittee shall continue to record and submit all values reported by a North Carolina -certified
test method (including field certified), even if these values fall below 50 gg/L.
5. Compliance to this limit begins on April 1, 2020, approximately 2 years from the permit
effective date.
6. 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 Nitnte/Nitrate Nitrogen.
7 If the quarterly value exceeds 4 times the annual average limit, then (a) the sampling frequency
shall increase to monthly and (b) a written noti=fication shall be sent to the Water Quality
Permitting Section and the Mooresville Regional Office.
8. This sample shall be taken promptly 72 to 80 hours after each introduction of offsite wastewater
into the equalization tank. If an introduction of offsite wastewater does not occur within a given
calendar quarter, a sample shall be taken of the -.ffluent and noted in the DMR and eDMR
Comments as "No introduction of offsite wastewater occurred during this quarter."
9. Because Uranium is limited as a Weekly Average, [adopted federal criteria 40CFR 141.26], a
quarterly value may be determined from one (1) quarterly sample, or by averaging multiple
samples talon within a restricted time-penod, not -to -exceed a calendar week [Sunday thru
Saturday].
10. WET Testing, Chronic; Quarterly using Ceriodaphnia dubia, limited [TGP3B]; 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.
Page 4 of 8

Permit NCO074772
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 -
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 mimmum 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 5 of 8

Permit NCO074772
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 c.wner/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.
The County Public Health Directors can be contacted using the following information:
Iredell County Health Director
318 Turners3urg Highway
Statesville, NC 28625
704-878-5300
(b) Public Notificat2on
Mecklenburg County Health Director
249 Billingsley Road
Charlotte, NC 28211
704-336-4700
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 wager, 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.
Page 6 of 8

Permit NCO074772
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports
and specify that, if a state does not establish a system to receive such submittals, then permittees must submit
monitoring data and reports electronically to the Environmental Protection Agency (EPA). 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)1
Effective December 21, 2016, 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 DENR / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a pernuttee 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. 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).
Page 7 of 8

Permit NC0074772
2. How to Request a Waiver from Electronic Reportinst
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver, a permittee must first submit ar_ 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 he 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 waver 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://portal ncdenr org/web/wq/admin/bog/lpu/edmr
3. 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 11, Section
B. (11.)(a) or by a duly authorized representative of that person as described in Part H, 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://portal.n-,deny org/web/wq/admin/boghpu/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 .o 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
submzttengfalse information, including the possibility offines and imprisonmentfor knowing violations "
4. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR subnnssions. 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 t --me [40 CFR 122.41].
Page 8 of 8