NC0040070_Renewal Application_20180622

ROY COOPER
;�. Governor
i;,
MICHAEL.S.REGAN
Secrets
Water Resources LDIDA CULPEPPER
IENVeRO$MENTAL QUALITY interim Director
June 22, 2018
Edward Cross, Division Manager
City of Gastonia
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 June 22, 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,
aLalbc31
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application(MR0)
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-807-6300

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NC DENR/DWR/NPDES
Renewal Application Checklist
The following items are REQUIRED for all renewal packages:
o A cover letter requesting renewal of the permit and documenting any changes at the facility since
issuance of the last permit. Submit one signed original and two copies.
o The completed application form (copy attached), signed by the permittee or an Authort7ed
Representative. Submit one signed original and two copies.
o If an Authorized Representative (such as a consulting engineer or environmental consultant) prepares
the renewal package,written documentation must be provided showing the authority delegated to the
Authorized Representative (see Part II.B.11.b of the existing NPDES permit).
o A narrative description of the sludge management plan for the facility. Describe how sludge (or other
solids) generated during wastewater treatment are handled and disposed. If your facility has no such
plan (or the permitted facility does not generate any solids), explain this in writing. Submit one signed
original and two copies.
The following items must be submitted by any Municipal or Industrial facilities discharging
process wastewater:
o Industrial facilities classified as Primary Industries (see Appendices A-D to Title 40 of the Code of
Federal Regulations, Part 122) and ALL Municipal facilities with a permitted flow >_ 1.0 MGD must
submit a Priority Pollutant Analysis (PPA) in accordance with 40 CFR Part 122.21.
The above requirement does NOT apply to non industrial facilities.
Send the completed renewal package to: RECE9VE®I®ENR1pWR
Wren Thedford
NC DENR/DWR/NPDES Unit JUN 22 2018
1617 Mail Service Center
Raleigh,NC 27699-1617 Water Resources
Permitting Section

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June 18, 2018
Ms. Wren Thedford
NC DENR/ DWR/ NPDES Unit �Y
1617 Mail Service Center �������®�®ETI®��
Raleigh, NC 27699-1617
JUN I s Z018
vVater Resource r►
Perm%tt�ng
Ms. Thedford,
The City of Gastonia-Two Rivers Utilities is requesting renewal of its NPDES permit#NC0040070 for
the Two Rivers Utilities Water Treatment Plant's Alum Sludge De-watering Facility. Please find
attached the permit request, the permit application form, our process description narrative, and
copies as requested. The current permit will expire January 31, 2019. There have been no changes
to this facility or equipment since the last renewal.
If additional information is required, please contact me at [phone].
Your assistance in this matter is greatly appreciated.
411110 ,/
C Edward Cross, Division Manager
Water Supply &Treatment Division
City of Gastonia—Two Rivers Utilities
pc: File

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 NC0040070
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 Gastonia-Two Rivers Utilities
Facility Name City of Gastonia-Alum De-watering Facility
RECEIVED/DENRIDWR
Mailing Address P.O. Box 1748
City Gastonia JUN 2 2 Z018
State / Zip Code 28053 Water Resources
Permitting-Section
Telephone Number 704-866-6827
Fax Number 704-854-6685
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above IZI
Street Address or State Road 298 West Page Ave.
City Gastonia
State / Zip Code NC 28052
County Gaston
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not refemng to the
Operator in Responsible Charge or ORC)
Name City of Gastonia
Mailing Address P.O. Box 1748
City Gastonia
State / Zip Code NC 28053
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal El ` 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)
El Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener El
6. Description of source water(s) (i.e. groundwater, surface water)
Surface Water (Mt. Island Lake)
7. Describe the treatment process(es) for the raw water:
Raw Water is pumped to the WTP from Mt. Island Lake. Aluminum Sulfate (Alum) and Sodium
Hypochlorite are added for coagulation and disinfection respectively. After coagulation,
sedimentation and filtration, Sodium Hydroxide is added for pH adjustment, sodium
bicarbonate, hexameta-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.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Sedimentation basin washwater and filter backwash water are sent to the Alum Sludge De
watering Facility via a gravity discharge line from the WTP. When the sedimentation basins are
cleaned, the effluent is discharged to the Alum Sludge De-watering Facility and a polymer is
added to assist in sludge settling. After the sludge has settled (usually 3-5 days) the clear water
is decanted to the creek. When the sludge tank (tank #2) is full, the sludge is addressed as in the
attached Sludge Management Plan.
When a filter wash occurs, the effluent is discharged to the Alum Sludge De-watering Facility
(tank #1). There is no coagulant aid needed as the filter backwash contains very little sludge.
After the sludge has settled (usually 2-4 hours) the clear water is dechlorinated with sodium
thiosulfate and decanted to the creek. Any sludge is transferred to the sludge tank (tank #2) and
addressed as in the attached Sludge Management Plan.
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: 4-6 hrs/day
11. Plant design potable flowrate 23.3 MGD
Backwash or reject flow 0.75 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Unnamed tributary to Long Creek (Please see attached map)
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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
Fluoride Yes X No
1
Ammonia nitrogen / Chloramines Yes No X
Zinc-orthophosphate or sweetwater CP1236 Yes X No
List any other additives below:
Sodium hypochlorite, Sodium hydroxide, Fluoride, Sodium Bicarbonate,
Hexameta-phosphate, Ortho-phosphate
14. Is this facility located on Indian country? (check one)
Yes ❑ No El
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].
(Please see attached)
• Solids Handling Plan
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
• 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.
C. Edward Cross Division Manager
Printed n. - •f 'n Signing Title
l2 %15
Signature of Applicant Date
Page 3 of 4 Version 5/2012

_ NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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
impnsonment 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

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June 18, 2018
Water Supply & Treatment Division
Sludge De-watering Facility
Sludge Management Plan
The City of Gastonia —Two Rivers Utilities' Water Supply&Treatment Division's Sludge De-watering
Facility, NPDES#NC0040070, receives its total in-flow from the Water Treatment Plant. The majority
of this flow consists of effluent from filter backwashes, sedimentation basin clean-outs, ancillary
leakage from pipes and sample points, and drainage from in—line analytical equipment. Most of the
solids received at the plant are associated with the sedimentation basin clean-outs and are treated
with polymer to enhance settling when necessary.
Flow received by this plant is directed to one of two 0.6 million-gallon basins, where the solids are
allowed ample time to settle. The water is removed by decant pumps which are operated on a float-
ball system to insure that sludge is not inadvertently pumped to the discharge. Also, operational
personnel at the Water Treatment Plant monitor the turbidity of the discharge effluent while the
decant pumps are in operation. From March 2006 to present, the effluent has been discharged to
the Long Creek Wastewater Treatment Plant under City of Gastonia — Two Rivers Utilities
Wastewater Treatment Division SIU Permit #1064. Due to this fact, a request to place our NPDES
Permit in an "inactive" status was made to the NCDENR Division of Water Quality and approved in a
letter dated May 26, 2009. In January, 2018 the permit was reactivated due to critical equipment
failures at the facility. A request to deactivate the permit was requested and approved in May, 2018.
Presently,sludge is stored in basin#2 until it is filled. When ready to be moved,the sludge is analyzed
and is disposed of by an outside vendor who removes the sludge via a portable sludge pressing
operation that de-waters the sludge and transports the residuals to a permitted landfill.
This facility also has the capability to pump residuals directly to the City of Gastonia — Two Rivers
Utilities' Long Creek Wastewater Treatment Plant, if necessary.
C Edward Cross, Division Manager
Water Supply and Treatment Division
City of Gastonia —Two Rivers Utilitie
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. ROAD CLASSIFICATION . SCALE 1 :24 000
PRIMARY HIGHWAY LIGHT-DUTY ROAD,HARD OR 0 1 MILE
HARD SURFACE iiimmem IMPROVED SURFACE
RegSnigffl 14•4ReNeMi PrieiggagMl
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1 0 1 KILOMETER
Latitude 35016106" Longitude 81°11116" }ono I 4
Map # Fl 4SW Sub-basin 030836 CONTOUR INTERVAL 20 FEET
_
Stream Class WS-II
QUAD LOCATION
Discharge Class Water Treatment Plant
AgglCity of Gastonia
-
Receiving Stream UT to Long Creek/Catawba River
idillIllr NC0040070
Gaston County
Design Q 1.2 MGD 111111111111111Mn VVTP
,-

City of Gastonia — Two Rivers Utilities
Alum Sludge De-watering Facility Water Plant
Line Diagram - (July 2014)
Alum Sludge
Facility
( ---
Basin #1 To Long Creek
00,000 gals. -• WWTP
De-chlorination
Effluent
Polymer ►, Collection
Y
addition %, Box Legend
Basin #2 ',
► Influent
► Effluent
600,000 gals.
44 To discharge to
Sludge tributary to
Inventory
Long Creek