NC0081426_Permit Issuance_20170419

Water Resources
ENVIRONMENTAL QUALITY
April 19, 2017
Mr. Steven Drew
City of Greensboro
P.O. Box 3136
Greensboro, NC 27402-3136
ROY COOPER
Gmwmo
MICHAEL S. REGAN
Se mlary
S. JAY ZIMMERMAN
Subject: Issuance of NPDES Permit NCO081426
N.I Mitchell WTP
Class PC-1
Guilford County
Dear Mr. Drew:
Direco,
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to
the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between
North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently
amended).
This final permit includes the following significant changes from the existing permit.
➢ Section A. (4) has been added to require electronic submission of effluent data. Federal regulations
require electronic submittal of all discharge monitoring reports (DMRs), effective December 21,
2016.
➢ Regulatory citations have been added to the permit.
➢ An updated outfall map has been included.
➢ Total Zinc and Hardness monitoring have been added.
➢ Monthly and daily average limits have been added for Copper
➢ Footnotes added for Fluoride and Ammonia Nitrogen
➢ Footnote removed for quarterly testing that samples should be taken in conjunction with toxicity
tests.
Please note that North Buffalo 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.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30)
days following receipt of this letter. This request must be in the form of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings
(6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this
decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may
require modification or revocation and reissuance of the permit. This permit does not affect the legal
requirements to obtain any other Federal, State, or Local governmental permit that may be required. If you
have any questions concerning this permit, please contact Anjali B. Orlando at telephone number (919) 807-
6388 or [e-mail].
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://dcq.nc.gov/about/divisionslwater-resourceslwater-resources-pemiitslwastewater-branchlnpdes-wastewater-permits

Sincerely,
S. Jay Zimmerm ,
Director, Division of Water Resources
cc: Central Files
Winston-Salem Regional Office
NPDES Unit

Permit NCO081426
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 provision 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, the
City of Greensboro
is hereby authorized to discharge wastewater from a facility located at the
N.L. Mitchell WTP
1041 Battleground Avenue
Greensboro
Guilford County
to receiving waters designated as North Buffalo Creek in subbasin 03-06-02 of the Cape Fear
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 April 24, 2017.
This permit and authorization to discharge shall expire at midnight on June 30, 2021.
Signed this day June 1, 2017.
S. Zimmerman, P.G., Dire o -
D sion' of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9

Permit NCO081426
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 included
herein.
The City of Greensboro
is hereby authorized to:
1. Continue to operate a conventional water treatment plant with a discharge of filter
backwash wastewaters. This water treatment plant facility currently has a design
potable flowrate of 24 MGD and a maximum, monthly average wastewater
discharge of 0.273 MGD.
The facility is located at the N.L. Mitchell WTP at 1041 Battleground Avenue, in
Greensboro, in Guilford County.
2. Discharge from said treatment works via Outfall 001, at the location specified on
the attached map into North Buffalo Creek [stream ID: 16-11-14-1 ] currently
classified WS-V; NSW waters in subbasin 03-06-02 [HUC: 0303000201 ] of the
Cape Fear River Basin.
Page 2 of 9

Permit NCO081426
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
Beginning with the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge treated wastewater from Outfall 001. Such discharges shall be
limited and monitored' by the Permittee as specified below:
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Flow 50050
Monitor & Report
Continuous
Recording
Effluent
Total Suspended Solids C0530
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
pH 00400
> 6.0 and < 9.0 standard units
2/Month
Grab
Effluent
Total Residual Chlorine 2 50060
17 Ng/L
2/Month
Grab
Effluent
Turbidity 00070
Monitor & Report
2/Month
Grab
Effluent
Aluminum 01105
Monitor & Report
Quarterly
Grab
Effluent
Total Iron 01045
Monitor & Report
Quarterly
Grab
Effluent
Total Copper 01042.
16.72 pg/L
F22.90 Ng/L
Quarterly
Grab
Effluent
Manganese 01055
Monitor & Report
Quarterly
Grab
Effluent
Fluoride 3 00951
Monitor & Report
Quarterly
Grab
Effluent
Total Zinc 4 01092
Monitor & Report
Quarterly
Grab
Effluent
Hardness — Total as [as 00900
CaCO3or (Ca + Mg)] 5 (mg/I)
Monitor & Report
Quarterly
Grab
Effluent
Hardness — Total as [as 00900
CaCO3 or (Ca + Mg)] (mg/l)
Monitor & Report
Quarterly
Grab
Upstream
Ammonia Nitrogen 6 C0610
Monitor & Report
Quarterly
Grab
Effluent
Total Nitrogen C0600
Monitor & Report
Quarterly
Grab
Effluent
Total Phosphorus C0665
Monitor & Report
Quarterly
Grab
Effluent
FWhole Effluent Toxicity TGP3B
Monitoring
Monitor & Report
Quarterly
Grab
Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see A. (4)].
2. The Division shall consider all effluent TRC values reported below 50 µg/1 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/ 1.
3. Fluoride should be monitored if the Permittee backwashes with fluoridated finished water.
4. Zinc should be monitored if the Permittee adds zinc orthophosphate as a corrosion inhibitor prior
to backwashing.
Page 3 of 9

Permit NCO081426
5. Effluent hardness sampling should be performed in conjunction with testing for hardness
dependent metals (cadmium, copper, lead, nickel, silver, and zinc) .
6. Ammonia Nitrogen should be monitored if the Permittee uses chloramines (adds ammonia to
chlorinated water) for secondary disinfection prior to backwashing.
7. Ceriodaphnia dubia 7-day pass/fail test @ 90% concentration. See Condition A. (2.) for toxicity
testing requirements. Toxicity testing should be performed during the months of March, June,
September and December, and sampling should coincide with sampling for parameters covered by
footnote 3.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN
TRACE AMOUNTS.
A. (2) CHRONIC TOXICITY MONITORING (QUARTERLY)
[15A NCAC 02B.0500 et seq.]
The permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December
2010, or subsequent versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The
testing shall be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be
performed during the months of March, June, September and December. 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.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using
the parameter code TGP3B. 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, 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 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 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.
Page 4 of 9

Permit NCO081426
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
then monthly monitoring will begin immediately. Upon submission of a valid test, this
monthly test requirement will revert to quarterly in the months specified above.
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) PERMIT RE -OPENER: WHOLE EFFLUENT TOXICITY
[NCGS 143-215.1(b)]
Whole Effluent Toxicity monitoring results indicating aquatic toxicity may result in the
Division of Water Resources re -opening this permit or requesting by letter that further
action be taken. Additional metals testing, a toxicity identification evaluation, a toxicity
reduction evaluation, and/or an assessment of discharge treatment alternatives may be
requested.
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.) (all
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
Page 5 of 9

Permit NCO081426
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.
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.pov/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.
Page 6 of 9

Permit NC0081426
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:
htty: / /deg.nc Gov/about/divisions /water -resources / edmr
4. Signatory Requirements [Supplements Section B. (11.1 (b) and Supersedes
Section B. (11.1 (4U
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: / Ideg.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 122.221. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
'7 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.�]
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
Page 7 of 9

Permit NCO081426
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 9

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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
Brianna Young/Meredith Wojcik
2/21/2017/Orlando 4/10/2017
Permit Number
NCO081426
Facility Name
N.L. Mitchell WTP
Basin Name/Sub-basin number
Cape Fear/03-06-02
Receiving Stream
16-11-14-1al
Stream Classification in Permit
WS-V; NSW
Does permit need Daily Max NH3 limits?
No limit; monitoring already present
Does permit need TRC limits/language?
Existing
Does permit have toxicity testing?
Already resent
Does permit have Special Conditions?
Yes — WET testing
Does permit have instream monitoring?
Yes- Hardness/upstream
Is the stream impaired (on 303(d) list)? For
whatparameter?
Yes; Benthos
Any obvious compliance concerns?
No
Any permit mods since lastpermit?
No
Current expiration date
6/30/2016
New expiration date
6/30/2021
Comments received on Draft Permit?
No
• Regulatory citations added
• Total hardness monitoring added
• Total zinc monitoring added
• Footnote removed for quarterly testing that samples should be taken in conjunction with
toxicity tests.
• Footnotes added for fluoride, ammonia nitrogen
• Monthly and daily average limits added for copper based on RPA — reasonable potential
to exceed allowable concentration
Most Commonly Used Expedited Language:
• 303(d) lanauaae 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 ComDliance Level for Cover Letters/Effluent Sheet Footnote:
"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."

Greensboro News Record
Advertising Affidavit
200 E. Market St
Greensboro, INC. 27401
[phone]
NCDEO-DIVISION OF WATER RESOURCES
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
Account Number
4019534
Date
March 10, 2017
PO Number Order Category Description
PUBLIC NOTICE 0000326130 Legal Notices Public Notice North Carolina Environmental Management Commission/ NPDES Unit 1617 MI
Pumle Noaca
..In Carellna Envtrenmantal
ManayaTOtR aIOn/
NSUnit
T ..It ..1..Cantor
R.a9a. Nis 276-loll of NOt10a WaanOwaNr Po TItNPCFS
The City
hBClty Ot araonsbor0 Wauostaa
1 COYnba N.L.MI.h.1= In thilrrd
This rvh �dfltabaaah —.—tar to North BYNaIo Creak In the Cape Fear
RI Var ..I..
Publisher of the
Greensboro News Record
Before the undersigned, a Notary Public of Guilford, North Carolina, duly commissioned,
qualified, and authorized by law to administer oaths, personally appeared the Publisher
Representative who by being duly sworn deposes and says: that he/she is the Publisher's
Representative of the Greensboro News Record, engaged in the publishing of a newspaper
known as Greensboro News Record, published, issued and entered as second class mail in
the City of Greensboro, in said County and Stare: that he/she is authorized to make this
affidavit and sworn statement: that the notice or other legal advertisement, a copy of which
is attached hereto, was published in the Greensboro News Record on the following dates:
03/10/2017
and that the said newspaper in which such notice, paper document, or legal advertisement
was published was, at the time of each and every such publication, a newspaper meeting all
the requirements and qualifications of Section 1-597 of the General Statutes of North
Carolina and was a qualified newspaper within the meaning of Section 1-597 of the General
Statutes of North Carolina.
signature ojpersoaw king afdavir)
Sworn to and subscribed before me the 10 day of March, 2017
LEA ANNE LAMB
NOTARY PUBLIC - (NoraryPublic)
OF NORTH CAROLINA
UILFORO COUNTY
,AISSION EXPIRES 06-15-19
THIS IS NOT A BILL. PLEASE PAY FROM INVOICE. THANK YOU

Water Resources
ENVIRONMEMA QUALITY
March 8, 2017
To: udson may. 09111 ►1 1°r
NC DEQ / DWR / Public Water Supply
Winston-Salem Regional Office
From: Brianna Young
NPDES Unit
Subject: Review of Draft NPDES Permit NCO081426
N.L. Mitchell WTP
Guilford County
ROY COOPER
U...
MICHAEL S. REGAN
.6crclmy
S. JAY ZIMMERMAN
Olrceom
Please indicate below your agency's position or viewpoint on the draft permit and return this
form by April 8, 2017. If you have any questions on the draft permit, please contact me at
919-807-6333 or via e-mail [[e-mail]].
RESPONSE: (Check one)
Mc oncur with the issuance of this permit provided the facility is operated and maintained properly,
the stated effluent limits are met prior to discharge, and the discharge does not contravene the
designated water quality standards.
❑ Concurs with issuance of the above permit, provided the following conditions are met:
❑ Opposes the issuance of the above permit, based on reasons stated below, or attached:
.Z ( 1-Z-0
l' I
State of North Caroline I Environmental Quality I Water Resouroes
1617 Mail Service Center I Raleigh, NC 27699-1617
919 807 6300 919-807-6389 FAX
hops://dcq.no.gov/about/divisions/water-n:sourom/wate m our -pe iWwaste ter-bm ditnpdo-wastewater-peamits

Wojcik, Meredith L
From: Wojcik, Meredith L
Sent: Tuesday, October 11, 2016 4:14 PM
To: '[e-mail]'
Subject: N. L. Mitchell WTP Permit Renewal
Attachments: Total Fluoride DMR results.xlsx
Hello,
I am working on processing your permit renewal application for the N.L. Mitchell Water Treatment Plant (NC0081426).
When reviewing your monitoring data, I noticed a discrepancy in units (micrograms vs. milligrams) for the Total Fluoride
data. Please see the attached spreadsheet. These data were pulled directly from the monitoring reports submitted to us.
If you believe that these units are in error, please inform me within 2 weeks and provide evidence via laboratory
reports. If I do not receive a response within 2 weeks, I will assume the units as reported are correct.
If these are the correct units, it is not necessary to send laboratory reports.
Thank you for your help,
Meredith Wojcik
Environmental Specialist
Division of Water Resources
Department of Environmental Quality
[phone]
m eredith.woici kO ncden r. oov
1617 Mail Service Center
Raleigh, NC 27699-1617
NC. Nothing Compares
no � es�b\f\se by
deadline
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties.

N.L. Mitchell WTP a
NCO081426 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 0.27 W WTP/W TP Class: PC-1
1Q10S(cfs)= 0.00 IWC% @ 1QIOS = 10o
7QIOS(cfs)= 0.00 tWC%@7QIOS= 100
7Q IOW (cfs)= 0.00 IWC%@7QIOW= 100
30Q2(cfs)= 0.00 IWC%@30Q2= 100
Avg. Stream Flow, QA (cfs) = 0.00 IW°/uC @ QA = 100
Receiving Stream: North Buffalo Creek HUC 0303000201 Stream Class: WS-V7 NSW
Outfall 001
Qw = 0.273 MGD
COMBINED HARDNESS (m
Acute = 25 mg/L
Chronic = 25 mg/L
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS WATER SUPPLY
Effluent Hard:0 value> 100 M91L
Ef wnt Hard Avg = 25 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
o)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
Chronic Applied Acute
ItpDet. Max Pred Cw Allowable Cw
it)
i
Standar
Acute: 10.47
RP shown- apply Monthly Monitoring with Limit
Copper
NC
7.8806 FW 10.4720
ugJL
11 11
33.84
_
______________
Chronic: 7.88
RP shown - apply Monthly Monitoring with Limit
4 >
values Allowable Cw
Acute: NO WQ
Fluoride
NC
1800 FW
ug/L
11 10
639.0
____
Chronic: I,800.0
_
____________
No RP, Predicted Max <50%of Allowable Cw - No
No value> Allowable Cw
Monitoring required
I t�
neves-h n9 hUranes3
dotty and stream
�I o w d ai,o�
9595 Final FW RPA w_upstmam avg data column diss to totalmetals_nodetects_limiteddefaults 2016_822, ma
Page 1 of 1 1113/2016

REASONABLE POTENTIAL ANALYSIS
Date Data
1 11/3/2014
2 5/12/2014
3 10/6/2014
4 5/3/2016
5 11/12/2012
6 8/3/2013
7 2/12/2014
8 1/6/2015
9 4/9/2015
10 7/6/2013
11 5/3/2013
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
BDL=112DL
2 2
3 3
3 3
3 3
4 4
5 5
5 5
8 8
11 11
14 14
18 18
Use"PASTE SP
Values" Nen "COPY'
Par13
. Mulmum data
points = s8
Results
Still Dev.
5,2622
1
Mean
6.9091
2
C.V.
0.7616
3
n
11
4
Mult Factor = 1.88
Max. Value 18.00 ug/L
Max. Pred Cw 33.84 ug/L
Date Data
B/ QW3 <
7/612013
4/9/2015
11/12/2012
1/6/2015
1113/2014
10/6/2014
2112/2014
5/3/2016
5/3/2013
5/12/2014
Fluoride
BDL=112DL
100 50
0.1 0.1
100 100
0.2 0.2
200 200
200 200
200 200
200 200
0.2 0.2
0.3 0.3
300 300
Use'PASTE SPEd
Valuaa' teen "COP
. Maximum data
Iwlnts = 5a
Results
Sid Dev.
109,6690
Mean
113,7091
C.V.
0,9645
n
11
Mult Factor = 2.13
Max. Value 300.0 ug/L
Max. Pred Cw 639.0 ug/L
9595 Final FW RPA w_upsaeam avg data column_diss to totalmetals_nodetects_limiteddefaults 2016_822, data
-2- 1113Y2016

Data
Parameter
Max of Value2
Min of Value2 2
Average of Value2
Count of Value2
00070 - Turbidity
36
0.5
4.305223881
134
00076 - Turbidity, HCH Turbidimiter
6.7
0.8
2.623529412
17
00400 - pH
8.9
5.2
6.858278146
151
00951 - Fluoride, Total (as F)
300
0.1
118.2545455
11
01042 - Copper, Total (as Cu)
0.018
0.002
0.006909091
11
01045 - Iron, Total (as Fe)
3.16
0.452
1.640090909
11
01055 - Manganese, Total (as Mn)
1.29
0.229
0.595363636
11
01105 - Aluminum, Total (as Al)
1.34
0.036
0.186818182
11
50050 - Flow, in conduit or thru treatment plant
3.481
0.001
0.411904047
939
50060 - Chlorine, Total Residual
86
10
19.65562914
151
CO530 - Solids, Total Suspended - Concentration
43.4
2.5
5.581456954
151
CO600 - Nitrogen, Total - Concentration
112
0.15
10.51363636
11
CO610 - Nitrogen, Ammonia Total (as N) - Concentration
102
0.1
9.372727273
11
CO665 - Phosphorus, Total (as P) - Concentration
0.365
0.02
0.053818182
11
TGP36 - Pass/Fail Static Renewal 7Day Chronic Cerioda hnia
2
1
1.636363636
11
ntu
ntu
su
ug/L
mg/L
mg/L
mg/L
mg/L
mgd
ug/L
mg/L
mg/L
mg/L
mg/L

GREENSBORO
NORtN CAROLINA
January 31, 2017
Ms. Brianna Young
Division of Water Resources, DEQ
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Ms. Young:
Thank you for your help and guidance concerning our N.L Mitchell WTP NPDES renewal
application.
Listed below is the information requested to help calculate the Total Copper parameter for the
Mitchell WTP NPDES permit.
The results include five (5) days of Total Hardness (CaCO3) for both, the Mitchell Plant effluent
and upsteam from outfall 001 for North Buffalo Creek.
I also contacted Mr. J Curtis Weaver, Hydrologist, PE from the USGS South Atlantic Water
Science Center, concerning the 7Q10 and 30Q2 for outfall 001. He was able to estimate both
parameters.
Jan. 3,2017
Jan. 4, 2017
Jan. 6, 2017
Jan. 8, 2017
Jan. 11, 2017
Average
Mitchell Plant
Effluent
Total Hardness, mg/L
Upstream
Total Hardness, mg/L
39
34
35
49
46
69
64
121*
52
140*
47
51
Outfall 001
7Q30 0.06 cfs
30Q2 1.9 cfs
*snow
event
*snow
event
PO BOX 3136 • GREENSBORO NC 27402-3136 • WWW.GREENSBORO-NC.GOV • 336-373-CITY (2489)
W

GREENSBORO
NORTH CAROLINA
If you have any questions, please call or e-mail me.
Sincerely,
Marie Shandor
Water Supply Lab Supervisor, Water Resources
Phone[phone]
Email: [e-mail]
cc: Mr. Michael Borchers, Assistant Director, Water Resources
Mr. Ali Khan, Operations Superintendent, Water Resources
640 PO BOX 3136 • GREENSBORO NC 27402-3136 • WWW.GREENSBORO-NC.GOV • 336-373-CITY (2489)

ic.
WaterResources
ENVIRONMENTAL QUALITY
November 3, 2016
CERTIFIED MAIL, 7015 0640 0007 9833 9934
RETURN RECEIPT REQUESTED
Mr. Steven D. Drew
City of Greensboro
P.O. Box 3136
Greensboro, NC 27402-3136
Dear Mr. Drew:
PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Secretary
S. JAY Z AMERMAN
Director
Subject: Request for Additional Information
NPDES Renewal Application
N.L. Mitchell WTP
NPDES permit NCO081426
Guilford County
The Division has reviewed your application, received on February 25, 2016, for renewal of NPDES peribit
NC0081426. To enable us to complete our review in accordance with N.C.G.S. 143-215.1 and 15A NCAC
2H.0105, please provide additional or revised information to address the following comments:
1. Please provide five (5) days of Total Hardness (CaCO3 or (Ca + Mg)) data for the water treatment
plant effluent and upstream from Outfall 001 for North Buffalo Creek.
2. Review of our records for this permit indicate that no stream flow data was provided to the Division
for the initial permit issued and subsequent renewals. If possible, please provide a 7Q 10 and 30Q2 at
the location of Outfall 001, for North Buffalo Creek [stream index number 16-11-14-1], a waterbody
classified WS-V; NSW, located within subbasin 03-06-02 [HUC: 0303000201 ] of the Cape Fear River
Basin by contacting from the following contact with the US Geological Survey:
J. Curtis Weaver, Hydrologist, PE
USGS North Carolina Water Science Center
3916 Sunset Ridge Road
Raleigh, NC 27607
Phone: [phone] // Fax: [phone]
E-mail address -- icweaver ,usgs.gov
Internet address -- http://nc.water.usgs.gov/
The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA subsequently approved
the WQS revisions on April 6, 2016 with some exceptions. The NC Division of Water Resources NPDES
Permitting Unit is required to implement the new dissolved metal standards in all permits public noticed after
April 6, 2016.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail service Center I Raleigh, North Carolina 27699-1617
919 806 6300

Mr. Drew
November 3, 2016
Page 2 of 2
The new standards for most metals include acute standards. Further, the freshwater standards for several
metals are expressed as the dissolved form of the metals, and seven metals have hardness -dependent
equations. As a result, the NPDES Permitting Unit will need site -specific effluent hardness data and instream
hardness data, upstream of the discharge, for each facility monitoring these metals in order to calculate
permit limitations. The metal of concern for the Pittsboro WTP permit is Total Copper.
If no response is received within 60 calendar days [per 15A NCAC 2H.0107(b)], the permit will be renewed
without the benefit of the additional information. Therefore, a default hardness of 25 mg/L (CaCO3 or (Ca +
Mg)) and a stream flow of zero will be used to calculate an effluent limit for Total Copper giving a daily
maximum limit of 7.88 µg/L.
If you have any questions, please contact Meredith Wojcik at 919-807-6479 or email at
[e-mail].
cc: NPDES Permit Files
Central Files
DWR/WSRO/WQROPS
Is Complete item 1, 2, and 3.
■ Print your name and address on the reverse
so that we can return the card to you.
■ Attach this card to the back of the mailpiece,
or on the front if space permits.
d _ Article Addressed to:
Mr. Steven D. Drew
City of Greensboro
PO Box 3136
Greensboro, NC 27402-3136
�� II�II I'IIIIIIIIIIIIIII Ilil IIIIII III III
9590 9401 0023 5071 0368 35
2. Article Number (rransfer from
7015 0640 0007 9833 9934
PS Form 3811, April 2015 PSN 7530-02-000-9053
Sincerely, ^/ /
Meredith Wojcik
Division of Water Resources, DEQ
X
(Prin Name) C. Date of
J kov 6
D. Is delivery address different from aem 17 Oyes
If YES, enter delivery address below: ❑ No
3. Service Type
❑ Priority Mall PxPress®
❑ Adult Signature
❑ Registered Mall"
❑ Adua Signature Restricted Cauvery
3
❑ Registered Mail Restricted
Certified Mail®
Delivery
❑ Certified Mail Restricted Delivery
❑ Retum Receipt for
❑ Collect on Delivery
❑ Collect on Delivery Restrcted Delivery
Mercitandiee
D Signature ConNmatlon"v
insured Mall
❑Signature Gonflrtnetlon
,red Mall Restricted Delivery
Restricted Delivery
Domestic Return Receipt

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Proiect Information
❑CHECK IF Hi OR ORW WQS
Facility Name
N.L. Mitchell WTP
WWTP/WTP Class
PC-1
NPDES Permit
NCO081426
Outfall
001
Flow, Ow (MGD)
0.273
Receiving Stream
North Buffalo Creek
HUC Number
0303000201
WS-V, NSW
Stream class
✓DAppty WS Hardness WQC
7011 Os (cfs)
0.06
0.00
7Q10w (cfs)
3002 (cfs)
1.90
CIA (cfs)
0.00
0.
1Q10s (cfs)
Effluent Hardness
47.2 mg/L (Avg)
------------------------------
Upstream Hardness _ _ _I
(Avg)
_ _ _ _ _ _ 82_6 mg/L _ _ _ _ _
Combined Hardness Chronic
51.6 mg/L
Combined Hardness Acute
50.95 mg/L.
___________________
Data Sources)
❑CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
Pal
Par07
ParOa
Pad 9
Par10
Parl1
Par12
Par13
Par14
Pal
Paris
Pari7
Paris
Paris
Par20
Par21
Pa22
Par23
Pa24
Table 2. Parameters of Concern
Name was Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
uglL
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
1.0201
FW
6.0299
ug/L
Chlorides
Aquatic Life
NC
230
FW
mglL
Chlorinated Phenolic Compounds
Water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
INC
213.1380
FW
1621.4397
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
Il
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
14.6386
FW
20.4801
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
6.6132
FW
167.3146
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
rich.
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
68.7339
FW
612.1755
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Lae
NC
5
FW
56
ug/L
Silver
Aquatic Life
INC
0.06
FW
1.0084
ug/L
Zinc
Aquatic Life
NC
234.1869
FW
229.7819
ug/L
81426 FW RPA 2017, input
2/21/2017

REASONABLE POTENTIAL ANALYSIS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
H2
Use'PpBTE SPECW.
Effluent Hardness values -men -Corr
Maximum data Upstream Hardness
. ,
polnls = 58
Date Data
BDL=112DL
1/3/2017
39
39
1/4/2017
35
35
1/6/2017
46
46
1/8/2017
64
64
1/11/2017
52
52
Results I
Std Dev.
11.4324
Mean
47.2000
C.V. (default)
0.6000
n
5
10th Per value
36.60 mg1L
Average Value
47.20 mg/L
Max. Value
64.00 mg/L
Values- Nen'COF
. Maximum data
points = 58
Date
Data
BDL=112DL
Results I
1 113/2017
34
34
Std Dev.
45.9489
2 1/4/2017
49
49
Mean
82.6000
3 1/612017
69
69
C.V.(default)
0.6000
4 1/8/2017
121
121
n
5
5 1/11/2017
140
140
1Oth Per value
40.00 mg/L
6
Average Value
82.60 mg/L
7
Max. Value
140.00 mg1L
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
81426 FW RPA 2017, data
2/21/2017

REASONABLE POTENTIAL ANALYSIS
values' than'COF
. Maaimum data
points = 58
Date Data
BDL=112DL
Results 1
12/11/2012
4
4
Still Dev.
5.2440
3/5/2013
18
18
Mean
6.3333
6/2512013
8
8
C.V.(default)
0.6000
12/17/2013
3
3
n
9
3/11/2014
2
2
6/102014
3
3
Mult Factor =
1.81
9/162014
11
11
Max. Value
18.00 ug/L
12/22014
5
5
Max. Pred Cw
32.58 ug/L
3/172015
3
3
3
Fluoride
Date Data
BDL=112DL
Results
1
12111/2012
200
200
SW Dev.
2
3/512013
300
300
Mean
3
6/25/2013
200
200
C.V. (default)
4
12/17/2013
300
300
n
5
3/112014
200
200
6
6/10/2014
200
200
Mull Factor=
7
9/16/2014
100
100
Max. Value
8
12/2/2014
200
200
Max. Pred Ow
9
3/172015
200
200
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
'PASTE SPECI
,ex" then'COF
Maximum data
points = 58
211.1111
0.6000
9
1.81
300.0 ug/L
543.0 ug/L
81426 FW RPA 2017, data
-2- 2121/2017

N.L. Mitchell WTP
Outfall 001
NCO081426
Freshwater RPA- 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw Ili= 0.27
1Q10S(cfs)= 0.05
7QIOS (cfs)= 0.06
7QIOW (cfs)= 0.00
30Q2 (cis) = 1.90
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: North Buffalo Creek HUC 0303000201
WWTP/WTPCIass: PC-1
IWC% @ 1QIOS = 89.41699495
fWC%@7Q105= 87.56362243
IWC%@7QIOW= 100
6VC%@30Q2= 18.19003989
IW°/aC@QA= 100
Stream Class: WS-V; NSW
Qw = 0.272552 MGD
COMBINED HARDNESS fm l
Acute = 50.95 mg/L
Chronic = 51.6 mg/L
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS WATER SUPPLY
Effluent Hard: 0 value - 100 mg/L
Effluent Hard Avg = 47.2 ri
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
PE
0
r
lied
Chronic St�Pd Acute
n # Det. Max Pred Cw Allowable Cw
(1)
a
D
Acute: 22.90
RP shown - apply Monthly Monitoring with Limit
Copper
NC
14.638E FW(7Q10s) 20.4801
ug/L
9 9 32.58
_-_ _-_-_ _-_ _ _ _-____
Note: n < 9 Default C.V.
_ _ ___ _ _ __
Chronic 16.72
_
RP shown - apply Monthly Monitoring with Limit
Limited date set
I values > Allowable Cw
Acute: NO WQS
Fluoride
NC
1800 FW(7QIOs)
ug/L
9 9 543.0
_ __
_ _ _ _ _ __
Note: n 59 Default C.V.
_ _ _
Chronic: 2,055.E
No RP, Predicted Max < SOYo of Allowable Cw- No
Limited data set
No value> Allowable Cw
Monitoring required
81426 FW RPA 2017, rya
Page 1 of 1 2/21/2017

City of Greensboro
NONorth Carolina
February 15, 2016
Ms. Wren Thedford
NC DEQ/DWR/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Mrs. Sprinkle:
RECEIVEDUDE(ID►NR
FEB 2 5 2016
Water Quality
Permitting section
This letter is to request renewal of an existing NPDES permit. Please find enclosed a completed
permit renewal package for the City of Greensboro's N.L. Mitchell Water Treatment Plant —
NPDES permit, NO. NC0081426. Limitations in sludge handling has been identified and added
to the CIP to mitigate future upgrades improving sanitary and stream discharge.
If you should need any additional information, please contact the Water Supply Manager at
[phone].
Sikelly,
Steven D. Drew
Director of Water Resources
cc: COGWR File
Enclosures
640 P.O. Box 3136 • Greensboro, NC 2 7402-3136 • www.greensboi,o-ne.gov • (336) 373-CITY (2489) • TTY # 333-6930

City of Greensboro
North Carolina
Addendum
Sludge Management Plan
The City of Greensboro's Mitchell Water Treatment Plan is a conventional surface water
treatment facility permitted to treat (filter) 24 million gallons of water per day (MGD). The
water produced by the facility meets all applicable State and Federal standards. The current
average daily production at the facility is 14 MGD.
All filter backwash wastewater from the facility flows to a settling basin on the plant site. Filter
backwash flow is intermittent based on plant treatment rate and raw water quality conditions.
The wasterwater-settling basin allows for gravity settling of captured solids and is equipped with
four floating decanters, which removes fine solids prior to discharge. As filter backwash flows
through the settling basin, solids removed during the treatment process (consisting primarily of
Ferric Sulfate precipitate and the captured turbidity causing materials from the untreated raw
water) settle to the bottom of the basin leaving a clear supernatant which meets the NPDES
permit requirements.
Sludge solids generated from the treatment process are drawn off the settling basin bottom on a
daily basis and discharged directly to the City's North Buffalo/Metro system of wastewater
reclamation plants via sanitary sewer. At the wastewater reclamation plant, sludge solids from
the water plant are blended with other wastewater solids and then thickened, dewatered, and
incinerated.
640 P.O. Box 3136 - Greensboro, NC 27402-3136 - www.greensboro-nc.gov • (336) 373-CITY (2489) • TTY # 333-6930