NC0028037_Renewal (Application)_20201014

ROY COOPER 4- 44,...,:-.),Ig
Governor
MICHAEL S.REGAN
SerrrrnryE
LINDA CULPEPPER NOR I H CAROLINA
Dui v Pt), Environmental Quality
January 15, 2020
City of Lexington
Attn: Tom Johnson, Dir. of Water Resources
28 W Center St
Lexington, NC 27292-3099
Subject: Permit Renewal
Application No. NC0028037
Lexington WTP #1 & 2
Davidson County
Dear Applicant:
The Water Quality Permitting Section acknowledges the January 14, 2020 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. 150E-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
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
cc: Central Files w/application
ec: WQPS Laserfiche File w/application
Nortt Caro na Departrnentof Envronrnents qua ty I D vson ofWste'Feso6raes
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LEXINGTON
NORTH CAROLINA
WATER RESOURCES
Q u A L I 'F Y FIRST
January 7th, 2020
NCDENR/DWR/NPDES Unit
Attn: Wren Thedford
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit—NC0028037
Lexington WTP RECEIVED
Davidson County JAN 14 2020
Application for Permit Renewal NCDEQ/DWRINPDES
Dear Sir/Madam:
By this letter and attachments, I am requesting renewal of the NPDES permit for the City of Lexington's
WTP#1 and #2—NC0028037.
Attached are the following: NPDES Permit Application Short Form C WTP, Plant schematic, and narrative
of Sludge Management Plan(below).
Narrative of Sludge Management Plan:
Sludge at the two Lexington Water Plants is generated from filter back washing and cleaning of
sedimentation basins. Coagulation at the Water Plants is done with alum.
Backwash water and basin washing water are collected in two holding lagoons. Sludge is allowed to
settle out and water is decanted from the top of each basin. This decanted water constitutes the
permitted discharge.
Concentrated sludge from the holding lagoons has polymer added to accelerate dewatering and is
pumped to one of 6 sand drying beds for air-drying. When the sludge is dry enough, it is removed by a
front-end loader and hauled to the Davidson County Landfill (permit number 29-06)for final disposal.
Please forward comments and questions to my attention at 336-248-3930 ext. 3926 or email
[e-mail]
Sincerely,
Water Resources - Public Works - Engineering
28 West Center Street- Lexington,NC 27292 - 336.248-3930
it
WwW.LI.YINGTONNC.GOV

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
NCDEQ / DWR / NPDES
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0028037
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 City Of Lexington
Facility Name City of Lexington WTP 1 86 2
Mailing Address 28 West Center Street
City Lexington
State / Zip Code NC 27292
Telephone Number [phone]
Fax Number ( )
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 2979 Greensboro St Ext
City Lexington
State / Zip Code NC 27292
County Davidson
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 Lexington
Mailing Address 28 West Center St
City Lexington
State / Zip Code NC 27292
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public El
Page 1 of 3 Version 6/2017

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:
Source Water is treated with Potassium Permanganate, Aluminum Sulfate, Sodium
Hydroxide and a polymer goagulant aid. Chemicals are flash mixed with raw water before
entering the flocculation stage and then solids are allowed to settle out in sedimentation
basins. The settled water is then filtered thru dual media filters and Sodium Hypochlorite
is added as a disinfectant before the finished water is pumped to the distribution system.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The sediment that is settled out in the sedimentation basins is periodically pumped out
and sent to the waste ponds as well as the waste water from the routine backwashing of
the filters. The ponds concentrate the solids which are periodically pumped to the sludge
drying beds and the pond decant is treated with calcium Thiosulfate for dechlorination
and the effluent discharges thru an outfall into Abbotts Creek.
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: 1 Duration: 6 hours
11. Plant design potable flowrate 9.3 MGD
Backwash or reject flow .200 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Abbotts Creek 35.8548 lat : -80.1977 long,
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes x No
Page 2 of 3 Version 6/2017

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Iron sulfate / ferrous sulfate Yes No x
Fluoride Yes x No
Ammonia nitrogen / Chloramines Yes No x
Zinc-orthophosphate or sweetwater CP1236 Yes x No
List any other additives below:
Sodium Hydroxide
Calcium Thiosulfate
Sodium Hypochlorite
14. Is this facility located on Indian country? (check one)
Yes ❑ No
15. Additional Information:
Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. Theplan should show the point[s] of addition for
p [ ]
chemicals and all discharges routed to an outfall [including stormwater].
Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15:
New applicants are strongly recommended to contact a permit coordinator with the
NCDENR Customer Service Center.
Was the Customer Service Center contacted? ❑ Yes ❑ 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.
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.
ow. J01Ah6r>1 \4A4tr 'RcSaOrc.Ss ':cce4r
Printed name of Person Signing Title
- g- aa
Signature of plicant 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 3 of 3 Version 6/2017

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WTP Flow Process Flow Diagram
Reservoir
Sedimentation Aii
•
Flash Mix
/ Sludge
removal
Finished Water Storage & Pumping
- � Back Wash
Waste
411
411
Decant Ponds
r--
/ Sludge to Drying
beds
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Effluent

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LEXINGTON
NORTH CAROLINA
WATER RESOURCES
QUALITY FIRST
January 22,2019
Division of Water Resources
Non-Discharge Permitting Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Subject: Signature Authority Designation
To Whom It May Concern:
As an appropriate signing official for the City of Lexington as designated by 15A NCAC
2T.0106,I hereby delegate authority to sign and certify all permit applications,reports or
other permit related documents to the following staff for the following permit types
(sewer,spray, land application)and/or permit numbers:
Person Permit Type or
Position Currently in Permit
Position Number
Water Tom Johnson
NC0055786
Resources NC0028037
Director WQ0016165
WQ0023213
WQ0001318
WQCS00042
If you have any questions,please contact me at the following:
Permittee/Applicant name(please print): City of Lexington/Newell Clark
Title:Mayor
Complete mailing address: 28 West Center Street
City: Lexington State: NC Zip: 27292
Telephone number: [phone]
Sincerely,
%� ��' „400 ,may
Newell 1"lark,Mayor -'
500 Glendale Road - Lexington,NC'27292 - 336.357.7889
W'W W.LEXING1UNNC.GOV