NC0089885_Draft Permit_20191016

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
NORTH CAROLINA
Environmental Quality
October 16, 2019
Mr. K. Calvin Saboorian
Duke Energy Carolinas, LLC
526 S. Church Street, EC03T
Charlotte, NC 28202
Subject: Draft NPDES Permit NCO089885
Charlotte Metro Office Tower Construction
Mecklenburg County
Dear Mr. Saboorian:
In response to your request to apply for the subject NPDES permit, the Division of Water Resources
(DWR or the Division) hereby transmits this draft for your review and comment. Please review this
document to assure your understanding of the permit limits and monitoring conditions, and to correct
errors, if any.
Additional information for the engineering alternatives analysis (EAA) was received on August 30,
2019, September 10, 2019, and September 19, 2019. Charlotte Water, the Publicly Owned Treatment
Works (POTW), does not accept groundwater discharges per the City of Charlotte's Sewer Use
Ordinance. The Division concurs that alternatives such as land application of wastewater, infiltration
galleries, ex -situ treatment & injection, and a sewer connection are cost prohibitive and/or
technologically infeasible as compared to a NPDES discharge.
Concurrent with this notification, the Division will solicit public comment on this draft by publishing a
notice in newspapers having circulation in the general Mecklenburg County area, as required by the
NPDES Program. Please provide your comments, if any, to me via email [[e-mail]] or
write to my attention care of DEQ / DWR / NPDES Program no later than November 15, 2019. Your
written comments are welcome but not mandatory.
Following the mandatory 30-day public comment period, the Division will review all pertinent
comments on your permit draft, and take appropriate action prior to issuing your NPDES permit final.
_E
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-707-3616

Mr. Saboorian
October 16, 2019
Page 2 of 2
If you have questions concerning this draft, please e-mail me or call my direct line [phone].
Sincerely,
'iAw
Derek Denard, Environmental Specialist
Division of Water Resources, NCDEQ
Enclosure: NPDES Permit NCO089885 (DRAFT)
hc: NPDES Program Files
ec: MRO / Corey Basinger [corey.basinger(a)ncdenr.gov], Edward Watson [[e-mail]]
Andrew Pitner [[e-mail]]; Wes Bell [wes.bell(a,ncdenr.gov]
Aquatic Toxicology Branch / Susan Meadows [susan.meadows(ancdenr.gov]
Wastewater Operator Certification Group / Maureen Kinney [Maureen.Kinneypncdenr.gov]
Richard Farmer [Richard.farmer(abmecklenburgcountync.gov]
McIntire, Mark D, Duke Energy Corporation [Mark.Mclntirepduke-energy.com]
David Penalva, NOVA [dpenalva@usanovacom]
Keith Rice, NOVA [krice(a,)usanovacom]

NPDES Permit NCO089885
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,
Duke Energy Carolinas, LLC
is hereby authorized to discharge wastewater from a facility located at the
Charlotte Metro Office Tower Construction
South College St. / South Tryon St., Charlotte
Mecklenburg County
to receiving waters designated as an unnamed tributary to Little Sugar Creek in the Catawba River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts
I, H, III, and IV hereof.
The permit shall become effective
This permit and the authorization to discharge shall expire at midnight on
Signed this day
Linda Culpepper, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

NPDES Permit NCO089885
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 described herein.
Duke Energy Carolinas, LLC
is hereby authorized to:
1. begin operating a 0.072 MGD construction dewatering and groundwater remediation system
consisting of, but not limited to;
• an 18,500-gallon weir tank
• bag filters (10-micon following by 0.5-micon)
• two (2) 1,500-pound granular activated carbon filters (GAC) filter vessels
• flow totalizers for Outfalls 001 & 002
• an effluent sample ports for Outfalls 001 & 002
located at Charlotte Metro Office Tower Construction site, South College Street & South Tryon
Street, Charlotte, Mecklenburg County; and
2. discharge from said treatment works via Outfalls 001 and 002 at a location specified on the attached
map, into an unnamed tributary to Little Sugar Creek [Stream Segment 11-137-8], currently a Class
C waterbody within Subbasin 03-08-34 [HUC: 030501030102] of the Catawba River Basin.
Page 2 of 8

NPDES Permit NCO089885
MITa
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Outfalls 001 & 002 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical Water Pollution Control System [15A NCAC 08G .0302]
Beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge from Outfalls 001 and 002. Such discharges shall be limited and monitored' by the Permittee
as specified below:
EFFLUENT CHARACTERISTICS
[Parameter Code]
LIMITS
MONITORING REQUIREMENTS 1
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations
Flow (MGD)
50050
0.072 MGD
Continuous
Recording
Effluent
Total Suspended Solids (TSS)
C0530
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
Turbidity TU 2
00070
Monitor & Report 2
2/Month
Grab
Effluent
pH (su)
00400
> 6.0 and < 9.0 standard units
2/Month
Grab
Effluent
Acetone (µg/L)
81552
2000 µg/L
2000 µg/L
2/Month
Grab
Effluent
Benzene (µg/L)
34030
51 µg/L
51 µg/L
2/Month
Grab
Effluent
Dichlorobromomethane (µg/L)
32101
17 µg/L
17 µg/L
2/Month
Grab
Effluent
Chloroform (µg/L)
32106
2000 µg/L
2000 µg/L
2/Month
Grab
Effluent
cis-1,2-Dichloroethylene (µg/L)
77093
720 µg/L
720 µg/L
2/Month
Grab
Effluent
Chlorodibromomethane (µg/L)
34306
21 µg/L
21 µg/L
2/Month
Grab
Effluent
Naphthalene (µg/L)
34696
12 µg/L
12 µg/L
2/Month
Grab
Effluent
sec-Butylbenzene (µg/L)
77350
Monitor & Report
2/Month
Grab
Effluent
Tetrachloroethylene (µg/L)
34475
3.3 µg/L
3.3 µg/L
2/Month
Grab
Effluent
Trichloroethylene (µg/L)
39180
30 µg/L
30 µg/L
2/Month
Grab
Effluent
Xylenes (µg/L)
81551
670 µg/L
670 µg/L
2/Month
Grab
Effluent
1-Methylnaphthalene (µg/L)
77418
2.6 µg/L
2.6 µg/L
2/Month
Grab
Effluent
2-Methylnaphthalene (µg/L)
77416
85 µg/L
85 µg/L
2/Month
Grab
Effluent
Bis (2-Ethylhexyl) Phthalate (µg/L)
C0100
5 µg/L
5 µg/L
2/Month
Grab
Effluent
Pyrene (µg/L)
34469
30 µg/L
30 µg/L
2/Month
Grab
Effluent
Oil and Grease (mg/L)
EPA Method 1664 SGT-HEM
00556
Monitor & Report
2/Month
Grab
Effluent
Total Chromium (µg/L) 3
C0034
Monitor & Report
2/Month 3
Grab
Effluent
Chromium, Hexavalent (µg/L) 3
01032
11 µg/L
16 µg/L
2/Month 3
Grab
Effluent
Total Copper (µg/L) 3
C0042
7.88 µg/L
10.47 µg/L
2/Month 3
Grab
Effluent
Total Lead (µg/L) 3
C0051
2.94 µg/L
75.49 µg/L
2/Month 3
Grab
Effluent
Total Nickel (µg/L) 3
C0067
37.33 µg/L
335.21 µg/L
2/Month 3
Grab
Effluent
Total Zinc (µg/L) 3
C0092
125.71 µg/L
125.71 µg/L
2/Month 3
Grab
Effluent
Total Hardness (as CaCO3)(mg/L)3
00900
Monitor & Report
2/Month 3
Grab
Effluent
Acute Whole Effluent Toxicity 5
TAA6C
r Monitor & Report 5
Monthly
Grab
Effluent
Page 3 of 8

NPDES Permit NCO089885
Organics, Total Purgeables (VOCs)
6
76029
Monitor & Report
Monthly
Grab
Effluent
(EPA Method 624) (µg/L)
Base Neutrals & Acids (Semi-VOCs)
6
76028
Monitor & Report
Monthly
Grab
Effluent
(EPA Method 625) (µg/L)
Footnotes:
1. The Permittee shall begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Condition A. (3.).
2. The effluent shall not cause the turbidity of the receiving stream to exceed 50 NTU. If natural background
conditions in the receiving stream (upstream) are greater than 50 NTUs then the effluent shall not cause an
increase in the turbidity of the receiving stream.
3. Effluent hardness sampling should be performed in conjunction with sampling for hardness dependent metals
(Copper, Lead, Nickel, Zinc, Chromium).
4. The Permittee shall sample instream hardness, upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream.
5. Whole Effluent Toxicity (WET): Acute, Monitor Only; Monthly (Pimephales promelas) 48-hour static test.
[See Section A. (3)].
Conditions:
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
• Discharge shall show no evidence as a source for oily film or sheen on the receiving stream.
Page 4 of 8

NPDES Permit NCO089885
A. (2.) ACUTE TOXICITY MONTHLY - MONITOR ONLY
[ 15A NCAC 02B .0200 et seq.]
The permittee shall conduct acute toxicity tests on a monthly basis using protocols defined as definitive in EPA
Document EPA-821-R-02-012 entitled "Methods for Measuring the Acute Toxicity of Effluents and Receiving
Waters to Freshwater and Marine Organisms." The monitoring shall be performed as a Fathead Minnow
(Pimephales promelas) 48-hour static test. Effluent samples for self -monitoring purposes must be obtained
during representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all waste treatment processes.
The parameter code for Pimenhales promelas is TAA6C. All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form (MR-1) for the month in which it was performed,
using the appropriate parameter code. Additionally, DWR Form AT-1 (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
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 and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. 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 any month, 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 any test data from either these monitoring requirements 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 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

NPDES Permit NCO089885
A. (3.) 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.)
• Section D. (6.)
• Section E. (5.)
Reporting
Records Retention
Monitoring Reports
I. Reportine Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)l
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 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.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 6 of 8

NPDES Permit NCO089885
• 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. ovg /compliance/final-national-pollutant-
discharge-elimination-s st�pdes-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:
hlM:Hdeg.nc.gov/about/divisions/water-resources/edmr
Page 7 of 8

NPDES Permit NC0089885
4. Sienatory Requirements [Supplements Section 13. (11.) (b) and Supersedes Section B. (11.) (d)l
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (I 1.)(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:
http://deg.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:
V 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.)l
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

IF F' ".
IF
1:6,0007' t
- LJI
i
•
s, • ` N
p-...,._....,yv t
W11; 7s'4rq_
V5
` -0 �� o T
.\`eQ'e`
0
Outfalls 001 & 002 �'<r
1 , Source: Esri, Dig italGtobeoGeoEye, Earthstar
>N'E /Airb so-, AeroGRID, IGN. and the 4
murmify
Outfalls 001 & 002
UT to Little Sugar Creek
[flows southeast]i
3 -
A R� -
�
H
♦ 74
t • Little Sugar Creek
" [flows South]
<�� pMn ti4 !r_ 9
c
':1•K
Co ht:©72W o National G o raphic Society-i-cubed
Duke Energy Carolinas LLC
Charlotte Metro Office Tower Construction
NPDES Permit NCO089885
South College St. / South Tryon St., Charlotte 28202
Receiving Stream: UT to Little Sugar Creek
Stream Segment: 11-137-8 Stream Class: C
River Basin: Catawba Sub -Basin #: 03-8-34
County: Mecklenburg HUC: 030501030102
rlt ��r
Outfall 11 1 :I' 1 4' '
SCALE Outfall 11 81 1
1:24,000 i Quad: Charlotte E, NC