NC0089923_Draft Permit_20210112

ROY COOPER
Governor •
MICHAEL S. REGAN
Secretary ^
S. DANIEL SMITH }'
Director
NORTH CAROLINA
Environmental Quality
January 12, 2021
William Deal, Senior Project Manager
Charlotte Water
c/o
5100 Brookshire Boulevard
Charlotte,North Carolina 28216
Subject: Permit Modification - Change Pages
DRAFT NPDES NC0089923
Sewer Extension Dewatering Treatment
WWTP Class PC-1
Baxter and McDowell Streets, Charlotte
Mecklenburg County
To Mr. Deal:
On October 30, 2020, the Division of Water Resources (DWR)received your consultant's
request to increase permitted flow via Bruce D. Reilly, P.E., Senior Project Manager for Civil &
Environmental Consultants, Inc. We understand from Mr. Reilly that groundwater inflow to your
active excavations is considerably greater than anticipated, and that an increase in permitted flow
for treatment is warranted.
Permit modification for flow requires another Public Notice. If we submit for notice on
12jan2021, we may likely issue the week ending 12Feb2021.
DWR has considered the potential impacts of this flow increase to the receiving-stream Class C
waters and can find no objection to your request considering that permit limits remain the same
under zero-flow receiving stream conditions. We have therefore adjusted the flow limit from
0.036 MGD to 0.108 MGD to reflect the treatment capacity of the existing system.
We also take this opportunity to make the following technical corrections:
1. treatment system Class is changed from PCNC to PC-1. Note that this requires a
Licensed Treatment System Operator;
2. several parameter codes were incorrect or excluded [see section A. (1.)].;
these include Trichloroethylene(TCE), Trichlorofluoromethane, 1,2,3
Trichloropropane, and Total Chromium;
3. eDMR reporting text [section A. (3.)] is now updated to reflect NPDES
Electronic Reporting Rule—Phase 2 Extension.
DEC
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617—919.707.9000

William Deal,Senior Project Manager
Charlotte Water
DRAFT Technical Correction Change Pages
Page 2 of 2
We have attached permit change-pages reflecting the above. Please insert these pages into your
existing permit and discard the old pages. If you have questions,please e-mail me at
[j o e.Corp oro n@ncd enr.gov].
Sincer ,
it
Joe . Corpor n, P.G.
D/ /DWR NPDES Permitting
J
Enclosure:NPDES Permit NC0089923(technical correction change pages)
ec: MRO,Ed Watson[edward.watson@a,ncdenr.Qov]
ATB,Hannah Hendrick
OCU,Maureen Kinney
Civil&Environmental Consultants,Inc.,Bruce Reilly[breilly@a,cecinc.com]

NPDES Permit NC0089923
WWTP Grade PC-1
PART I
A. (l.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] WWTP Grade PC-1 [15A NCAC 08G.0302]
During the period beginning on the effective date of this permit and lasting until the construction phase
is completed, the Permittee is authorized to discharge via Outfall 001 and/or Outfall 002 [and/or
alternate Outfalls 001 and 002]. Such discharges shall be limited, monitored 1 and reported 2 by the
Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Daily Measurement Sample Sample
[Parameter Code] Average Maximum Frequency Type Location
Flow(MGD) 50050 0.108 0.108 Episodic Recording Effluent
pH 00400 Not<6.0 or>9.0 s.u. 2/Monthly Grab Effluent
Benzene 34030 51 µg/L* 51 µg/L* 2/Monthly Grab Effluent
Toluene 34010 11 µg/L 11 µg/L 2/Monthly Grab Effluent
Ethylbenzene 34371 97 µg/L 97 µg/L 2/Monthly Grab Effluent
Total Xylenes 81551 670 µg/L 670 µg/L 2/Monthly Grab Effluent
Acetone 81552 2000 µg/L 2000 µg/L 2/Monthly Grab Effluent
Tetrachloroethylene(PCE) µg/L 78389 3.3 µg/L* 3.3 µg/L* 2/Monthly Grab Effluent
Trichloroethylene(TCE) µg/L 39180 30 µg/L 30 µg/L 2/Monthly Grab Effluent
67,000
Trichlorofluoromethane 34488 µg/L* 67,000µg/L* 2/Monthly Grab Effluent
1,2,4 trimethylbenzene (µg/L) 77222 390 µg/L 390 µg/L 2/Monthly Grab Effluent
1,2,3 trichloropropane 77443 0.001 µg/L* 0.001 µg/L* 2/Monthly Grab Effluent
1,2-Cis-Dichloroethene(DCE) 77093 720 µg/L* 720 µg/L* 2/Monthly Grab Effluent
1-Methylnaphalene (µg/L) 77418 2 6 µme* 2 6 µ�L* 2/Monthly Grab Effluent
2-Methylnaphalene (µg/L) 77416 200 µg/L* 200 µg/L* 2/Monthly Grab Effluent
Naphthalene (µg/L) 11417 12 µg/L 12 µg/L 2/Monthly Grab Effluent
Total Suspended Solids(TSS) C0530 30.0 mg/L 45.0 mg/L 2/Monthly Grab Effluent
Turbidity 3 00070 50 NTU 50 NTU 2/Monthly Grab Effluent
Whole Effluent Toxicity(WET)4 TAA6C Monitoring report 2/Monthly Grab Effluent
Total Hardness(mg/L) 00900 Monthly Grab Effluent&
[CaCO3 or Ca+Mg] Upstream
Oil and Grease(mg/L) 00556 Monthly Grab Effluent
[EPA Method 1664 SGT-HEM]
Total Arsenic (µg/L) ** 01002 Monthly Grab Effluent
Total Barium(µg/L) ** 01007 Monthly Grab Effluent
Total Cadmium(µg/L) ** 01027 Monthly Grab Effluent l
Total Chromium(µg/L) ** C0034 Monthly Grab Effluent
Total Mercury(µg/L) COMER Monthly Grab Effluent
Page 3 of 8

NPDES Permit NC0089923
WWTP Grade PC-1
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Daily Measurement Sample Sample
[Parameter Code] Average Maximum Frequency Type Location
Total Copper(µg/L)** 01042 Monthly Grab Effluent
Total Lead(µg/L) ** 01051 Monthly Grab Effluent
Total Zinc(µg/L)** 01092 Monthly Grab Effluent
Total Nickel(µg/L)** 01067 Monthly Grab Effluent
Total PAHs 5(µg/L) C0456 Quarterly Grab Effluent
(EPA Method 8270D)
Polychlorinated biphenyls(PCBs)5 39516 Quarterly Grab Effluent
(µg/L)(EPA Method 8280A)
Organics,Total Purgeable(VOCs)5 76029 Quarterly Grab Effluent
(µg/L)(EPA Method 624)
Base Neutrals&Acids 5(µg/L) 76028 Quarterly Grab Effluent
(Semi-VOCs,EPA Method 625)
Footnotes(pg.3 &4):
1. The Permittee shall maintain onsite,available for DWR inspection,sampling logs and laboratory
analyses of internal sampling conducted to verify system treatment-component contaminant
breakthrough.
2. Beginning on the effective date of this permit,the Permittee shall submit monthly Discharge
Monitoring Reports(DMRs)electronically using the Division's eDMR application system [see
Condition A. (3.)].
3. Turbidity limit [narrative] is mandated by stream class [C].
4. Whole Effluent Toxicity(WET): Acute,Monitor Only;Monthly(Pimephales promelas)48-hour
static test. [See Section A. (2.)].
5. Sampling and analyses shall be conducted in the first month of the calendar quarter. For eDMR
reporting of this test method,the Permittee shall enter"1" =1 if detected,and"0" [NO
eP g [Yes(Y) ] (N)
=0] if not detected.Parameters detected by this method shall be recorded in the"Comments"
section,to include the compound and its reported concentration. Laboratory reports shall be kept on
file in accordance with records retention requirements,Part II. Section D. 6.
*limit based on Fish Consumption.
**Total Hardness dependent
Conditions: Permit limits apply at end-of-pipe [NCAC 02B. 0211(21].Compliance problems shall be
addressed through Best Management Practices [NCAC 02B.0202].
Page 4 of 8

NPDES Permit NC0089923
WWTP Grade PC-1
A. (2.) ACUTE TOXICITY MONTHLY - MONITOR ONLY
[15A NCAC 02B .0200 et seq.]
The Permittee shall conduct acute toxicity tests monthly 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 Pimephales 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°
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 Quality 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.
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NPDES Permit NC0089923
WWTP Grade PC-1
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. 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
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. 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.
Page 6 of 8

NPDES Permit NC0089923
WWTP Grade PC-1
➢ NPDES Electronic Reporting Rule—Phase 2 Extension. EPA is proposing to
extend the Phase 2 deadline from December 21, 2020 until at least December 21,
2023. The current compliance date will be extended if the implementation date is
extended as a final regulation change in the federal register.
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-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
4. 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 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 7 of 8

NPDES Permit NC0089923
WWTP Grade PC-1
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. 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.)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