NC0040070_Renewal (Application)_20090612

Beverly Laves rerau
Governor
A�3�
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
�� 'r
e Coleen H. RFCSullins Men
Director "y
June 12, 2009
C EDWARD CROSS
MANAGER
J U N 16 2009
WATER SUPPLY AND TREATMENT DIVISION DWVSulace �,Vdtof , i'-J..ilon
CITY OF GASTONIA UTILITIES DEPARTMENT
PO BOX 1748
GASTONIA NC 28053
Subject: Receipt of permit renewal application
NPDES Permit NCO040070
Gastonia WTP
Gaston County
Dear Mr. Cross:
The NPDES Unit received your permit renewal application on June 12, 2009. A member of the NPDES
Unit will review your application. They will contact you if additional information is required to complete your
permit renewal. You should expect to receive a draft permit approximately 30-45 days before your existing permit
expires.
If you have any additional questions concerning renewal of the subject permit, please contact Tom Belnick
at [phone].
Sincerely,
Dina Sprinkle
Point Source Branch
cc: CENTRAL FILES
gional Office/Surface Water Protection
#PWDEOS Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Ralegh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877.623-6748
Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer
Nne
orthCarofina
Naturally

1V 4-1
Great .Place. Great .People. Great .Promise.
,June 4, 2009
Mrs. Dina Sprinkle R E` � E i V FE"I"J"
NC DENR / DWQ/ Point Source Branch n
1617 Mail Service Center
Raleigh, NC 27699-1617
DENR - WATER QUALITY
POINT SOURCE BRANCH
Mrs. Sprinkle,
The City of Gastonia is requesting renewal of its NPDES permit #NC0040070 for the
Gastonia 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, 2010.
The addition of a de -chlorination system is the only change to the facility or
equipment at this location since the last permit renewal.
If additional information is required, please contact me at [phone].
Your assistance in this matter is greatly appreciated.
C Edward Cross, Manager
Water Supply & Treatment Division
City of Gastonia - Utilities Dept.
pc: File
sppermreg09
WS&T
Page 1

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. DENR / Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO040070
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
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
City of Gastonia
City of Gastonia - Alum Sludge Dewatering Facility
P.O. Box 1748
Gastonia
N.C. 28053
D'
[phone]
[phone] '. f
[e-mail]
DENR
LITY
2. Location of facility producing discharge:
POINT SOURCE BRANCH
Check here if same as above
Street Address or State Road 298 W. Page Ave.
City Gastonia
State / Zip Code N.C. 28052
County Gaston
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 Gastonia
Mailing Address P.O. Box 1748
City Gastonia
State / Zip Code NC 28053
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public
Pagel of 3
C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
reatment 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 (Mt. Island Lake)
7. Describe the treatment process(es) for the raw water:
Raw water is pumped to the WTP from Mt. Island Lake. Chlorine and Polyaluminum
Chloride are added for disinfection and coagulation respectively. After coagulation,
sedimentation, and filtration, Sodium hydroxide is added for pH stabilization, sodium
bicarbonate, hexametaphosphate and orthophosphate are added for corrosion control,
fluoride is added as a dental health aid, and chlorine is added to maintain a chlorine
residual in the distribution system.
S. 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 de -
chlorinated 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 27.3 MGD
Backwash or reject flow 0.75 (MAX) MGD
Page 2 of 3
C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
f receiving stream(s) (Provide a map showing the exact location of each outfall, including
and longitude): Unnamed tributary to Long Creek (Please see attached map)
Page 3 of 3
C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
ist all water treatment additives, including cleaning chemicals, that have the
aI to be discharged.
Polyaluminum Chloride, Chlorine, Sodium Hydroxide, Fluoride, Sodium Bicarbonate,
Hexametaphosphate, Orthophosphate
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 treatment process, and point of addition of chemicals. (Please See Attached)
➢ Solids Handling Plan - (Please see attached narrative - "Sludge Management Plan")
16. NEW Applicants
Information needed in addition to items 1-15:
➢ New applicants must contact 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
Manager
Printed name of Persgusigning
Title
Signature of Applicant
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 3
C-WTP 03/05

Latitude: 35°16'06"
Longitude: 81 °11' 16"
(Zuad: Gastonia North, N.C.
Stream Class: C
Subbasin: 30836
Receiving Stream: U-I' Long Creek
N00040070
Gastonia WTP
Facility
Location
oathF NOT TO MALE

fN
ROAD CLASSIFICATION
PRIMARY HIGHWAY LIGHT -DUTY ROAD, HARD OR
HARD SURFACE IMPROVED SURFACE
SECONDARY HIGHWAY
HARD SURFACE UNIMPROVED ROAD _
Latitude 35016'06"
Longitude 81°11'16"
Map # F14SW
Sub -basin 030836
Stream Class
WS-II
Discharge Class
Water Treatment Plant
Receiving Stream
LIT to Long Creek/Catawba River
Design Q 1.2 MGD
SCALE 1:24 000
1
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)X[SKKt3iX:<UK- 4iC[Ki[vC[J 1KL:t.-GX.Y000(tW LKti-f4{q([{ttppytpt
)OOOGOOe6COM.b00t0[ dJ0003)DDC0665Lb3 SOOO60GSAiE06b66: f�A'ACUOMOpfpt
QUAD LOCATION City of Gastonia
NCO040070
% Gaston County
WTP

Great Plczce. Great People. Great_ Promise.
June 8, 2009
Water Supply & Treatment Division
Sludge De -watering Facility
Sludge Management Plan
The City of Gastonia 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 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.
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's Long Creek Wastewater Treatment Plant, if necessary.
C Edward Cross, Division Manager
Water Supply and Treatment Division
City of Gastonia - Utilities Dept.
sppermnarr09 WS&T Page 1

City of Gastonia
Alum Sludge De -watering Facility
Line Diagram - (June 2009)
Basin #1
600,000 gals. ,
Polymer
addition
600,000 gals.
Sludge
Alum Slud
Facility
De -chlorination "
Effluent
-------- ---► Collection
Box
Water Plant
To Long Creek
WWTP
To discharge to
tributary to
Long Creek
Legend - z
► Influent
------► Effluent
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