NC0088200_Renewal (Application)_20230928

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Morgan Huffman
City of Thomasville
1106 S Fulton St
Salisbury, NC 28144-6469
Subject: Permit Renewal
Application No. NCO088200
City of Thomasville WTP
Davidson County
Dear Permiee:
NORTH CAROLINA
Environmental Quality
September 28, 2023
The Water Quality Permitting Section acknowledges the September 28, 2023 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://deg.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.
ec: WQPS Laserfiche File w/application
Sincerely,
Cynthia Demery
Administrative Assistant
Water Quality Permitting Section
North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office 1 450 West Hams MITI Road Suite 300 1 Winston-Salem. North Carolina 27105
336.776.9800

l
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
https•//www.deg.nc.szov/about/divisions/water-resources/permittin /g_npdes-wastewater/npdes-permitting-
process/npdes-individual-permit-applicationsDivision of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO088200
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 Thomasville
Facility Name Thomasville Water Treatment Plant �' `
E( �. ED
Mailing Address PO Box 368
City Thomasville 5 E F 2 8 U'2 3
State / Zip Code NC, 27361
Telephone Number [phone] NCDEQ/DWR/NPDES
Fax Number ( )
e-mail Address Misty. Conder thomasville-nc.gov
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road Old Lexington Road
City Thomasville
State / Zip Code NC, 27360
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 Thomasville
Mailing Address PO Box 368
City Thomasville
State / Zip Code NC, 27361
Telephone Number [phone] ext 2
Fax Number ( )
4. Ownership Status:
Page 1 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Federal ❑ State ❑ Private ❑ Public X
5. Type of treatment plant:
X Conventional (Includes coagulation, flocculation, and sedimentation, 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 - Lake Thoma-Lex
7. Describe the treatment process(es) for the raw water:
Potassium Permanganate added sometimes during summer months.
S. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Wastewater from the water treatment plant is discharged to the Alum Lagoon at Old Lexington
Road where settling of the alum sludge occurs. Prior to discharge to the lagoon chlorine is
removed from the waste stream with ascorbic acid. There is no further treatment of the waste at
the lagoon other than detention and settling of the waste. A screen is in place at the discharge
pipe to keep large debris such as leaves from getting into the flow meter.
9. Number of separate discharge points: 1
Outfall Identification number(s) 001
10. Frequency of discharge: Continuous X Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
11. Plant design potable flowrate 6.0 MGD
Backwash or reject flow 0.3 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Unnamed tributary to Rich Fork Creek, to Abbots Creek, to Yadkin River
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Alum / aluminum sulfate Yes X No
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
Sodium Hypochlorite
Vita-D-Chlor
14. Is this facility located on Indian country? (check one)
Yes ❑ No X
15. Additional Information:
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].
See attached diagram
�0 Solids Handling Plan
Solids from the current lagoon dredging are currently being piled in a small section within
the confines of the pond so that rain water drainage off the mound goes back into the pond.
This mound of wastes is currently in the proposed budget for disposal at the Davidson
County Landfill for 2023 and is estimated to cost about $250,000.
It is expected that we can get approximately 5 - 6 years more use of the lagoon before it
must be drained and partially dredged again. It takes about a year for solids to dry enough
to be dredged each time this occurs. Disposal of the solids from such dredging will be
budgeted prior to the expected occurrence since costs have been determined. During the
draining and dredging process alum wastes from the WTP are temporarily diverted to the
WWTP through the sewer system and solids generated from that arre disposed of with
WWTP solids. Once dredging is completed alum wastes will be sent back to the lagoon.
Preliminary planning is in the process for constructing a solids handling facility at the WTP.
It is as yet undetermined as to whether this might be a belt press or a centrifuge system. It
is possible that some other system might also be developed such as replacing our current
lagoon with a new dual channel lined lagoon that would allow one side to be used while one
was being drained and dredged. Until this solids handling facility can be designed, funded
and built the alum lagoon will continue to be operated in the use/dredge-WTTP
disposal/use cycle.
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 ❑ No
y Analyses of source water collected
Page 3 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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.
Leigh A. (Misty) Conder NPDES Permit ORC
Printed name 4f Person Signing Title
L/
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.)
RECEIVED
SEP 28
NCDEQ/DWR/NPDES
Page 4 of 4 Version 5/2012

Sodium Bisulfate
Waste Sludge Avg 0.18 MGD
Treatment Pumping Alum Sludge
Plant Buildina Lagoon
Potassium Treated Water
Permanganate Sample Point
Raw Water
Lake Thom-a-Lex t Sample Point
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Pre Caustic
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Alum
Pre Chlorine Post Chlorine
�----� t Fluoride
Filters Phosphate
Basin 1 1
Post Caustic
Basin 2 2 Finished Water Sample Point
Pump Well
Easin:3:]-- 3 1 2
Post Chemical Clearwells �E]
Basin 4 4 Mixing Box
Basin 5 5
Basin 6 6
Settled Water Filtered Water Elevated Tanks
Sample Point Sample Point