NC0040070_Renewal (Application)_20231023

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RICHARD E. ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
October 23, 2023
City of Gastonia
Attn: C. Edward Cross, Division Manager
PO Box 1748
Gastonia, NC 28053
Subject: Permit Renewal
Application No. NC0040070
Two Rivers Utilities WTP
Gaston County
Dear Applicant:
The Water Quality Permitting Section acknowledges the October 23, 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. 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
cc: Chris High, Asst. Division Mgr.
ec: WQPS Laserfiche File w/application
North Carolina Department of Environmental Quality Division of Wa[er Resources
E Q Mooresville Regional Office 610 East Crnter Avenue.Su to 301 Mooresville North Carolina 28115
/ 704.663.1699

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October 17, 2023
RECEIVED
To: Ms. Wren Thedford
N.C. Division of Water Resources OCT 2 3 2023
From: Chris High, Asst. Division Mgr. NCDEQ/DWR/NPDES
Two Rivers Utilities - Gastonia WTP
Subject: Form 1 of NPDES Application Submittal for City of Gastonia - Alum
Sludge DeWatering Facility - NC0040070
Ms. Thedford,
Please find enclosed USEPA Form 1 of our NPDES application for renewal of the City
of Gastonia Alum Sludge DeWatering Facility - NPDES Permit# NC 0040070. We were
late in compiling and submitting our application which expires 01 /31 /24 and are
working with the assistance of Bradley Bennett of the Compliance and Expedited
Permitting Section in getting the proper renewal forms submitted ASAP. We are
currently working with our commercial laboratory in getting the required analyses
completed to allow us to submit Form 2C as required.
I apologize for the delay in our timely submission of our renewal and we are working
diligently to complete the remaining documentation as soon possible. Please advise
of any issues, concerns or additional information that I can provide.
Regards,
ris High, Asst. Di ion Mgr.
Two Rivers Utilities - Gastonia WTP
704.214.9155

EPA Identification Number NPDES Permit Number Facility Name • Form Approved 03/05/19
e 11-if 9 OMB No.2040-0004
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Form U.S.Environmental Protection Agency
1 .-.EPA Application for NPDES Permit to Discharge Wastewater
NPDES GENERAL INFORMATION
SECTION 1.ACTIVITIES REQUIRING AN NPDES PERMIT(40 CFR 122.21(f)and(f)(1))
1.1 Applicants Not Required to Submit Form 1
Is the facility a new or existing publicly owned Is the facility a new or existing treatment works
1.1.1 treatment works? 1.1.2 treating domestic sewage?
If yes,STOP. Do NOT complete No If yes,STOP. Do NOT ' No
Form 1.Complete Form 2A. complete Form 1.Complete
Form 2S.
1.2 Applicants Required to Submit Form 1
1.2.1 Is the facility a concentrated animal feeding 1.2.2 Is the facility an existing manufacturing,
operation or a concentrated aquatic animal commercial,mining,or silvicultural facility that is
a. production facility? currently discharging process wastewater?
Yes 4 Complete Form 1 VS No Yes 4 Complete Form ❑ No
and Form 2B. 1 and Form 2C.
1.2.3 Is the facility a new manufacturing,commercial, 1.2.4 Is the facility a new or existing manufacturing,
mining,or silvicultural facility that has not yet commercial,mining,or silvicultural facility that
commenced to discharge? discharges only nonprocess wastewater?
Yes 4 Complete Form 1 No Yes 4 Complete Form Q No
cc and Form 2D. 1 and Form 2E.
°:• 1.2.5 Is the facility a new or existing facility whose
discharge is composed entirely of stormwater
associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
Yes 4 Complete Form 1 iz No
and Form 2F
unless exempted by
40 CFR
122.26(b)(14)(x)or
b 15 .
SECTION 2.NAIVE,MAILING ADDRESS,AND LOCATION(40 CFR 122.21(f)(2))
2.1 Facility Name
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0 2.2 EPA Identification Number
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co 2.3 Facility Contact
Name(first and last) Title Phone number
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c Email address
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2.4 Facility Mailing Address ✓
Z StAa8ok ,9qf
t or P.O.box
Cit or town State ZIP code
EPA Form 3510-1(revised 3-19) Page 1

EPA Identification Number NPDES Permit Number ~ O� ility�acne • Form Approved 03/05/19
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Street,route number,or other specific identifier
age 4). /),/9i A/f
c Coun name County code(if known)
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City or town State ZIP code
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SECTION 3.SIC AND NAICS CODES(40 CFR 122.21(f)(3))
3.1 SIC Code(s) Description(optional)
it if/ idafuc SuP'LY
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z 3.2 NAICS Code(s) Description(optional)
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SECTION 4.OPERATOR INFORMATION(40 CFR 122.21(f)(4))
4.1 Name of Operator
� .07 4 14i4 tC4
0 4.2 Is the na a you listed in Item 4.1 also the owner?
E Yes ❑ No
4.3 Operator Status
_
❑ Public—federal ❑ Public—state +Q'Other public(specify)/jN/Nie.,04.1
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CI Private CI Other(specify)
4.4 Phone Number of Operator
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4.5 Operator Address
Street r P.O.Box
1P_aok /'ivg
City or town State ZIP code
00 --fr1-5ttontc.- J C• a&ns3
OEmail address of operator
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SECTION 5.INDIAN LAND(40 CFR 122.21(f)(5))
03 c 5.1 Is the facility located on Indian Land?
C �' ❑ Yes RNo
EPA Form 3510-1 (revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
G o c1.54-orir`a_ OMB No.2040-0004
NC 0044 toqo Rtunt sl c . rcuAs .`..
SECTION 11.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
11.1 In Column 1 below, mark the sections of Form 1 that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority.Note
that not all applicants are required to provide attachments.
Column 1 Column 2
2 Section 1:Activities Requiring an NPDES Permit ❑ wl attachments
0 Section 2:Name,Mailing Address,and Location ❑ w/attachments
❑ Section 3:SIC Codes 0 w/attachments
❑ Section 4:Operator Information ❑ w/attachments
❑ Section 5: Indian Land ❑ wl attachments
❑ Section 6:Existing Environmental Permits ❑ w/attachments
d (� Section 7:Mapwl topographic
map ❑ w/additional attachments
o �1 Section 8:Nature of Business [►' wf attachments
21 Section 9:Cooling Water Intake Structures ❑ w/attachments
i d
C' El Section 10:Variance Requests ❑ w/attachments
c
[21 Section 11:Checklist and Certification Statement ❑ wf attachments
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11.2 Certification Statement
I 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 fine and imprisonment for knowing violations.
Name(print or type first and last name) Official title
C 1 )c—rc� Cy14955 I 1/- f- ktAit,e9tA, b yh
Signature Date signed
✓ �- `O, /(a, Z�
EPA Form 3510-1(revised 3-19) Page 4

EPA Identification Number NPDES Permit Number facility blame Form Approved 03/05/19
et i(r 000-4 51V MA C' OMB No.2040-0004
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SECTION 6.EXISTING ENVIRONMENTAL PERMITS(40 CFR 122.21(f)(6))
6.1 Existing Environmental Permits(check all that apply and print or type the corresponding permit number for each)
ErNPDES(discharges to surface ❑ RCRA(hazardous wastes) ❑ UIC(underground injection of
water) fluids)
•2- / c O D'DD 70
w a ❑ PSD(air emissions) ❑ Nonattainment program(CAA) ❑ NESHAPs(CM)
❑ Ocean dumping(MPRSA) ❑ Dredge or fill(CWA Section 404) ❑ Other(specify)
SECTION 7. MAP(40 CFR 122.21(f)(7))
7.1 Have you attached a topographic map containing all required information to this application?(See instructions for
R specific requirements.)
EYes ❑ No ❑ CAFO—Not Applicable(See requirements in Form 2B.)
SECTION 8. NATURE OF BUSINESS(40 CFR 122.21(f)(8))
8.1 Describe the nature of your business.
I
Pltase sec A-e - 4 rie41.ien1 /".taCes“s
07
46
SECTION 9.COOLING WATER INTAKE STRUCTURES(40 CFR 122.21(f)(9))
9.1 Does your facility use cooling water?
❑ Yes ErNo4 SKIP to Item 10.1.
. 9.2 Identify the source of cooling water.(Note that facilities that use a cooling water intake structure as described at
a, 2 40 CFR 125,Subparts I and J may have additional application requirements at 40 CFR 122.21(r).Consult with your
C �' ' - NPDES permitting authority to determine what specific information needs to be submitted and when.)
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SECTION 10.VARIANCE REQUESTS(40 CFR 122.21(f)(10))
10.1 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(m)?(Check all that
apply.Consult with your NPDES permitting authority to determine what information needs to be submitted and
when.)
❑ Fundamentally different factors(CWA ❑ Water quality related effluent limitations(CWA Section
cc Section 301(n)) 302(b)(2))
❑ Non-conventional pollutants(CWA ❑ Thermal discharges(CWA Section 316(a))
Section 301(c)and(g))
g Not applicable
EPA Form 3510-1(revised 3-19) Page 3

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Two Rivers Utilities WTP-Alum De-watering Facility NPDES Permit NC0040070
Receiving Stream:UT to Long Creek Stream Class:C EP .
Facility Location
Stream Segment 11-129-16-(4) Sub-Basin#.03-08-36 scale not shown
River Basin:Catawba HUC,0305010206
County:Gaston

Two Rivers Utilities — Gastonia WTP
N Sludge De-Watering Facility
(Plant Flow Diagram)
Waste From WTP
BASIN 1
Sludge Plant Waste
Return to Secondary
BASIN 2 Snorkel Membranes
Snorkel i
OFFICE
WTP Waste_
♦ To S. Plant WTP
Decant _
Pumps (2) To Secondary
NPDES Permit Membranes
To Creek
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SIU Permit To
W. Page Ave. Long Creek WWTP

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Application Form 1 -Section 8-1 Attachment
Please find outlined below the City of Gastonia Water Plant raw water
treatment process and the wastewater treatment process for wastewater
generated by the Water Plant facility. This wastewater is treated by the City
of Gastonia Alum Sludge De-Watering Facility and discharged in accordance
with State of North Carolina NPDES Permit# NC0040070:
• Treatment Process for raw water by the Water Treatment Plant:
• On the conventional treatment section of the Water Plant, Raw Water is
pumped to the plant from Mt. Island Lake. Aluminum Sulfate (Alum) is
added in the flash mix section of the basin for coagulation prior to the
sedimentation process. After sedimentation occurs, Sodium
Hypochlorite is added on top of the multi-media filters for initial
disinfection.
• After coagulation, sedimentation and filtration, the following post
treatment is performed: Sodium hydroxide is added for pH
stabilization. Sodium bicarbonate, hexameta-meta phosphate and
ortho-phosphate are added for corrosion control, fluoride is added as a
dental health aid, and sodium hypochlorite is added to maintain a
chlorine residual in the distribution system.
• On the low-pressure submerged membrane section of the Water Plant,
raw water is pumped through the membrane basins and directly to the
primary membranes with no pre-chemical treatment. The permeate
from the primary membranes is then treated in the same manner as the
post treatment described above prior to distribution.
• On the secondary membrane section of the Water Plant, plant
wastewater from basin and filter washes, and Water Plant leakage is
returned from the Alum Sludge De-Watering Facility to the Water Plant
Secondary membranes where it is processed through the secondary
membranes then discharged to the influent raw water flow for the Water
Treatment Plant for treatment. This secondary membrane treatment
process allows us to reclaim approximately 1 MGD (Million Gallons/Day)

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that would have been previously discharged to our City of Gastonia
Wastewater Treatment Plant under a SIU Permit.
• Treatment Processes for the treatment of process wastewater generated
by the Water Plant:
• Sedimentation basin washwater along with conventional filter and
membrane filter backwash water is sent to a sludge holding tank at
the Alum Sludge De-Watering Facility via a gravity discharge line from
the Water Plant. When the sedimentation basins at the Water Plant are
cleaned, the effluent is discharged to the Alum Sludge De-Water
Facility and a small amount of polymer is added to assist in proper
sludge settling. After the sludge has settled (usually 3-5 days) the
clear water on top is decanted to the NPDES permitted discharge
point. When the sludge holding tank is full, the sludge is removed
utilizing a portable sludge press and disposed of in accordance with
our sludge removal vendor's permit.
• When a filter backwash occurs at the Water Plant, the effluent is
discharged to the Alum Sludge De-Watering Facility, via gravity to Tank
#1 . There is no polymer added as the filter backwash contains minimal
amounts of particulates. After the particulates have settled (usually 2-
4 hours) the clear water is dechlorinated with sodium thiosulfate and
decanted to the NPDES designated discharge point. Any sludge is
transferred into sludge tank #2 and addressed, when full, as noted
above.