NC0084387_Renewal (Application)_20190925

i
ROY COOPER s �,�
Gen cinor
\k:i.:n.‘.....0., :'
MICHAEL S.REGAN Q ••
Secretory ` 'y"Na$1'..0
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
October 04, 2019
Charlotte Water
Attn: John C. Huber, Chief of Operations
5100 Brookshire Blvd
Charlotte, NC 28216-3371
Subject: Permit Renewal
Application No. NC0084387
Lee S. Dukes WTP
Mecklenburg County
Dear Applicant:
The Water Quality Permitting Section acknowledges the October 1, 2019 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deq.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
" lei"D ‘l-kl —t-ta
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
D�� -y_ North Caro r.a Department of Env ror.mentat 4'a ty I Di of Water Resources
✓�f� Mooresv a Red ana Dffce 161D Eel Center Avenue,Su:coto 301 I Mooresv e,NorthCaro no
2
8115
...-j -.�\ .' 704-693-1699

CHARLOTTE
WTER
RECEIVED
September 25, 2019 OCT 01 2019
NCDEQ/DWR/NPDES
Division of Water Resources
WQ Permitting Section —NPDES
1617 Mail Service Center
Raleigh NC 27699-1617
Subject: Renewal NPDES Permit# NC0084387
Lee S. Dukes Water Treatment Plant
Mecklenburg County
WQ Permitting Section,
Charlotte Water would like to request renewal of NPDES permit NC0084387 at the Lee S. Dukes
Water Treatment Plant. The current permit is set to expire February 28, 2020. Enclosed is the
completed NPDES Permit Applications Short Form C.
Also attached to the Short Form C are:
• Solids Management Plan
• Plant Flow Schematic
• Outfall/Discharge Location
If you have any questions, please contact me at 704-399-2426 extension 222 or Gabe Sasser at
704-507-5267.
Sincere! 111
C
John C. tuber
Chief or Operations
City of Charlotte
Charlotte Water
Charlotte Water 5200 Brookshire Blvd,Charlotte,NC 28216 charlottewater.org
tilif Operated by the City of Charlotte

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0084387
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise,please print or type.
1. Contact Information:
Owner Name Charlotte Water
Facility Name Lee S. Dukes WTP
Mailing Address 7980 Babe Stillwell Rd.
City Huntersville
State / Zip Code North Carolina / 28078
Telephone Number (704-948-6954)
Fax Number (704-948-7581)
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road
City
State / Zip Code
County
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name City of Charlotte
Mailing Address 5200 Brookshire Blvd
City Charlotte
State / Zip Code North Carolina
Telephone Number 704-399-2142
Fax Number 704-393-9163
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public
Page 1 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
Surface Water
7. Describe the treatment process(es) for the raw water:
Raw Water is treated with potassium permanganate and carbon as needed. Aluminum sulfate is
added at the head works of the plant. The water then passes through three stages of
flocculation before entering the sedimentation basins. Chlorine is added just before filtration.
Following filtration, lime, fluoride and chlorine are added to the water prior to flowing to
clearwells.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Solids are generated from the water treatment process, consisting mostly of alum residuals.
Solids generated from the sedimentation basins are discharged thru a gravity thickener and
then to a holding lagoon. Solids are also generated from filter backwashes and discharged to an
EQ basin. The solids from the EQ basin are sent to a clarifier. The solids are then sent to the
thickener before being directed to a holding lagoon. Clarified water goes over the weir of the
clarifier, through a de-chlorination chamber to the NPDES discharge point. Solids from the
holding lagoon are removed and land applied according to permit requirements.
Solids Plan
1. Solids generated from the sedimentation basins are discharged thru a gravity
thickener and then discharged to a holding lagoon.
2. Solids generated from filter backwashes are discharged to an EQ basin. The solids
from the EQ basin are sent to a clarifier. The solids are then sent to the thickener before
entering a holding lagoon. Clarified water goes over the weir of the clarifier, through a
dechlorination chamber to Outfall 001.
3. Solids from the holding lagoon are removed and land applied by a contractor as a
liquid. We also have the ability to tanker the liquid to a belt press for land application or
land fill disposal.
4. The contractor must follow permit # WQ 0000057 Version 2.
9. Number of separate discharge points: 1
Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ❑ Intermittent ❑
If intermittent:
Days per week discharge occurs: 7 - Duration: Approximately 4 hours per day
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
11. Plant design potable flowrate 25.31 MGD
Backwash or reject flow .206 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
McDowell Creek
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes
Iron sulfate / ferrous sulfate Yes
Fluoride Yes
Ammonia nitrogen / Chloramines No
Zinc-orthophosphate or sweetwater CP1236 No
List any other additives below:
Chlorine, Powdered Activated Carbon, Potassium Permanganate, Lime,
Liquid Linear Phosphate, Sodium Bisulfite
Note: Chlorine dioxide will be applied to the raw water from Lake Norman in the future; no
implementation date has been set as construction has not been completed.
Ferrous sulfate may be applied in the future to the raw water from Lake Norman as well.
14. Is this facility located on Indian country? (check one)
Yes ❑ No Eg
15. Additional Information:
y Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. The plan should show the point[s] of addition for
chemicals and all discharges routed to an outfall [including stormwater].
• Solids Handling Plan (Please see Question 8)
16. NEW Applicants
Information needed in addition to items 1-15:
• New applicants are highly encouraged to contact a permit coordinator with the
NCDENR Customer Service Center.
Was the Customer Service Center contacted? ❑ Yes El No
• Analyses of source water collected
• Engineering Alternative Analysis
• Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
Page 3 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
John . Huber Chief of Operations
Printe n•me of Person Si in Title
9/25/19
4 lc
Sig to e of Applicant Date
North Carolina General Statute 143-215.6(b)(2)provides that:Any person who knowingly makes any false statement representation, or certification in any application,
record,report,plan,or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article,or who falsifies,tampers with,or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article,shall be guilty of a misdemeanor punishable by a fine not to exceed$25,000,or by
imprisonment not to exceed six months,or by both. (18 U.S.C.Section 1001 provides a punishment by a fine of not more than$25,000 or imprisonment not more than 5
years,or both,for a similar offense.)
Page 4 of 4 Version 5/2012

Lee S. Dukes Water Treatment Plant
Process Flow Diagram
CIO2 Carbon Alum Chlorine Polymer KMn04 Chlorine Chlorine Flouride Lime Clearwell
1
9 MG
Clearwell
Sedimentation Filter
East Module 1 East Module 1
• 1 • Finished11.
High Service To 978
Lake Norman Water 2 --► -►
Pump Station Zone Raw Water Maximum Desgn Flow.Yu.3 mqd 9MG
Sedimentation l Filter
East Module 2 East Module 2
Clearwell
3
9 MG
Backwash Bisulfite
Water
Polymer
Sed Basin V
Residuals Clarifier
EQ Effluent Dechlorination To Creek
Basin Clarifier ► Contact ► Outfall
Chanter °ara 001
Maxow
ED Basin Solids Fb
BB myd
Max Des Flows ign
Influent:13.8 mgd •
Erhart:4.4 rtgd Thickened
Residuals
Thickener ► Lagoon
Land Application
VV
25 Sep 2019

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Charlotte Water Facility '`"''
Lee S. Dukes Water Treatment Plant (WT
P) , Location cle:L____... .., ,. I
7980 Babe Stillwell Farm Road,Hunterville 28078 Scale 1:24.000 �
Receiving Stream: McDowell Creek Stream Class: WS-IV;CA
Stream Segment: 11-115(5) Sub-Basin: 03-08-33
Drainage Basin: Catawba RUC: 03050101 NPDES Penult NC0084387
Latitude: 35°25'42" Longitude: 81°53'17" North
State Grid/USGS Quad: Fl 5NW/Lake Norman S Mecklenburg County