NC0088200_Renewal Application_20181108

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ROY COOPER NORTH CAROLINA
001761?tor Environmental Quality
MICHAEL S_REGAN
secretin,:
LINDA CULPEPPER
.Interim Director
November 08, 2018
Kelly Craver, ORC
City of Thomasville
PO Box 368
Thomasville, NC 27361-0368
Subject: Permit Renewal
Application No. NC0088200
City of Thomasville WTP
Davidson County
Dear Applicant:
The Water Quality Permitting Section acknowledges the November 8, 2018 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,
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
DEQ).
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-807-6300

"` 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 NC0088200
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
Mailing Address PO Box 368
City Thomasville
State / Zip Code NC, 27361
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 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]
Fax Number ( )
4. Ownership Status: "
Federal ❑ State ❑ Private ❑ Public X
Page 1 of 4 Version 5/2012

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4.3 NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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)
El Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener 0
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.
8. 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 0
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.
Alum / aluminum sulfate Yes X No
Iron sulfate / ferrous sulfate Yes No X
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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
Solids Handling Plan
Solids from the last time the lagoon was partially dredged are currently 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
either the Davidson County Landfill or the Winston Salem landfill for 2020 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. Disposal of the solids from that 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 will be temporarily diverted to the
WWTP through the sewer system and solids generated from that will be 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
• Analyses of source water collected
• Engineering Alternative Analysis
Page 3 of 4 Version 5/2012

I
NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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.
Ltiviv A. flr'5)y ff Cidu A/1005 periAJ 0 pc
Printe game of Person Signing Title
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Signat re 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

Sodium Bisulfate
A
Waste Sludge, Avg 0.18 MGD
Treatment — Pumping Alum Sludge
Plant Buildin Lagoon. .
Pre Chlorine Post Chlorine
A A
Fluoride
A
Filters Phosphate
Potassium Treated Water —
.
Permanganate Sample Point Basin 1' 1 -
A Raw Water A Post Caustic
Lake Thom-a-Lex Sample Point — -Basin 2
A 2 A Finished Water Sample Point
A Pump Well
Basin 3 3 — —
—
2
o al _ Post Chemical Clearwells
3 * m * 7 R — ; Basin 4 4 Mixing Box
3 i,
KJ mm R o
rt , — Basin 5 ---I 5-
Pre Caustic - -
Alum — Basin 6y --� .6r .
Settled Water Filtered Water Elevated Tanks
Sample Point Sample Point