NC0021369_Renewal Application_20180220

Water Resources
ENVIRONMENTAL QUALITY
February 20, 2018
Timothy Bath, Town Manager
Town of Columbus
PO Box 146
Columbus, NC 28722
Subject: Permit Renewal
Application No. NCO021369
Columbus WWTP
Polk County
Dear Applicant:
ROY COOPER
Gorernor
XfICH.AEL S- REGAN
secret
LLNDA CULPEPPER
Interim Director
The Water Quality Permitting Section acknowledges the February 20, 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://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.
Sincerelyw6��
'�
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
cc: Central Files w/application
ec: WQPS Laserfiche File w/application
State of North Carolina 1 Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

NORTH CAROLINA
Ms. Wren Thedford
NC DENR/ DWR/ NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Ms. Thedford,
RECEIVE®jDEN�DWR
va 20 NIB
water Resources $t on
perm
February 12, 2018
Please find enclosed the Town of Columbus' application for renewal of NPDES Permit
Number NC0021369.
The following changes to the plant have been made:
- Upgraded headworks
- Installation of automatic spiral screw screen compactor and vortex grit removal
- Addition of a 12-foot deep 150,000-gallon clarifier with a new RAS/WAS pump building
- Installation of a 230,000-gallon tank for sludge land -application
- CL2 and dechlorination upgraded to flow proportional
Should you have any questions regarding the submitted information, please contact Columbus
Town Hall at 828-894-8236.
Sincerely,
Jason Phillips
Wastewater ORC
828-768-0962
jason.phillipskcolumbusnc.com
Tim Barth
Town Manager
828-894-8236
managergcolumbusnc.com
P.O. Box 146 Columbus, North Carolina 28722 828.894.8236 Fax [phone]
www.columbusnc.com

Bypass Bar Screen
30 HP Floating
Aerator (1)
It
3-15 HP
1-25 HP
Floating Aerators
For land
applying sludge
ITo truck loading station
Secondary Clarifiers
I
Gas CL2
Flow proportional
EFF to
creek
Sludge Return Line
300 gpm
Variable Speed Pumps
(2)

FACILITY NAME AND PERMIT NUMBER: Form Approved 1114199
Columbus WWTP NC 0021369 OMB Number 2040-0086
FORM
2A NPDES FORM 2A APPLICATION OVERVIEW
NPDES
APPLICATION OVERVIEW
Form 2A has been developed in a modular format and consists of a 'Basic Application Information" packet and
a "Supplemental Application Information" packet. The Basic Application Information packet is divided into two
parts. All applicants must complete Parts A and C. Applicants with a design flow greater than or equal to 0.1
mgd must also complete Part B. Some applicants must also complete the Supplemental Application
Information packet. The following items explain which parts of Form 2A you must complete.
BASIC APPLICATION INFORMATION:
A. Basic Application Information for all Applicants. All applicants must complete questions A 1 through A 8 A treatment
works that discharges effluent to surface waters of the United States must also answer questions A 9 through A 12
B. Additional Application Information for Applicants with a Design Flow > 0.1 mgd. All treatment works that have design
flows greater than or equal to 0 1 million gallons per day must complete questions B 1 through B 6
C. Certification. All applicants must complete Part C (Certification)
SUPPLEMENTAL APPLICATION INFORMATION:
D. Expanded Effluent Testing Data. A treatment works that discharges effluent to surface waters of the United States and
meets one or more of the following criteria must complete Part D (Expanded Effluent Testing Data)
1 Has a design flow rate greater than or equal to 1 mgd,
2 Is required to have a pretreatment program (or has one in place), or
3 Is otherwise required by the permitting authority to provide the information
E. Toxicity Testing Data. A treatment works that meets one or more of the following criteria must complete Part E (Toxicity
Testing Data)
1 Has a design flow rate greater than or equal to 1 mgd,
2 Is required to have a pretreatment program (or has one in place), or
3 Is otherwise required by the permitting authority to submit results of toxicity testing
F. Industrial User Discharges and RCRA/CERCLA Wastes. A treatment works that accepts process wastewater from any
significant industrial users (SIUs) or receives RCRA or CERCLA wastes must complete Part F (Industrial User Discharges and
RCRA/CERCLA Wastes) SIUs are defined as
1 All industrial users subject to Categorical Pretreatment Standards under 40 Code of Federal Regulations (CFR) 403 6 and
40 CFR Chapter I, Subchapter N (see instructions), and
2 Any other industrial user that
a Discharges an average of 25,000 gallons per day or more of process wastewater to the treatment works (with certain
exclusions), or
b Contributes a process wastestream that makes up 5 percent or more of the average dry weather hydraulic or organic
capacity of the treatment plant, or
c Is designated as an SIU by the control authority
G. Combined Sewer Systems. A treatment works that has a combined sewer system must complete Part G (Combined Sewer
Systems)
ALL APPLICANTS MUST COMPLETE PART C (CERTIFICATION)
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 1 of 21

FACILITY NAME AND PERMIT NUMBER' I Form Approved 1114199
Columbus WWTP NC 0021369 OMB Number 2040-0086
BASIC APPLICATION INFORMATION
I PART A. BASIC APPLICATION INFORMATION FOR ALL APPLICANTS: I
All treatment works must complete questions A.1 through A.8 of this Basic Application Information packet.
A 1. Facility Information
Facility name Town of Columbus WWTP
Mailing Address PO Box 146 Columbus. NC 28722
Contact person Jason Phillips
Title Operator In Responsible Charge
Telephone number [phone]
Facility Address
(not P O Box)
A.2 Applicant Information If the applicant is different from the above, provide the following
Applicant name Town of Columbus
Mailing Address PO Box 146 Columbus NC 28722
Contact person
Title Town Manager
Telephone number [phone]
Is the applicant the owner or operator (or both) of the treatment works?
owner operator
Indicate whether correspondence regarding this permit should be directed to the facility or the applicant
facility applicant
A 3. Existing Environmental Permits. Provide the permit number of any existing environmental permits that have been issued to the treatment
works (include state -issued permits)
NPDES NC 0021369 PSD
UIC Other
RCRA Other
A 4 Collection System Information. Provide information on municipalities and areas served by the facility Provide the name and population of
each entity and, if known, provide information on the type of collection system (combined vs separate) and its ownership (municipal, private,
etc )
Name Population Served Type of Collection System Ownership
Town of Columbus 1052 Separate Sanitary Municipal
Total population served 1052
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 2 of 21

FACILITY NAME AND PERMIT NUMBER.
Columbus WWTP NC 0021369
A 5 Indian Country
a Is the treatment works located in Indian Country?
Form Approved 1114199
OMB Number 2040-0086
Yes No
b Does the treatment works discharge to a receiving water that is either in Indian Country or that is upstream from (and eventually flows
through) Indian Country?
Yes No
A.6. Flow. Indicate the design flow rate of the treatment plant (i e , the wastewater flow rate that the plant was built to handle) Also provide the
average daily flow rate and maximum daily flow rate for each of the last three years Each year's data must be based on a 12-month time
period with the 12th month of "this year" occurring no more than three months prior to this application submittal
a Design flow rate 0 80 mgd
Two Years Ago Last Year This Year
b Annual average daily flow rate 017 014 0 14 mgd
c Maximum daily flow rate 081 070 0 50 mgd
A 7. Collection System. Indicate the type(s) of collection system(s) used by the treatment plant Check all that apply Also estimate the percent
contribution (by miles) of each
i1, Separate sanitary sewer 10000
Combined storm and sanitary sewer %
A 8 Discharges and Other Disposal Methods
a Does the treatment works discharge effluent to waters of the U S ? Yes
If yes, list how many of each of the following types of discharge points the treatment works uses
i Discharges of treated effluent
n Discharges of untreated or partially treated effluent
ui Combined sewer overflow points
iv Constructed emergency overflows (prior to the headworks)
v Other
1
0
0
0
No
b Does the treatment works discharge effluent to basins, ponds, or other surface
impoundments that do not have outlets for discharge to waters of the U S ? Yes No
If yes, provide the following for each surface impoundment
Location
Annual average daily volume discharged to surface impoundment(s) mgd
Is discharge continuous or intermittent?
c Does the treatment works land -apply treated wastewater? Yes No
If yes, provide the following for each land application site
Location
Number of acres
Annual average daily volume applied to site Mgd
Is land application continuous or intermittent?
d Does the treatment works discharge or transport treated or untreated wastewater to another
treatment works? Yes No
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 3 of 21

FACILITY NAME AND PERMIT NUMBER.
Columbus WWTP NC 0021369
Form Approved 1114199
OMB Number 2040-0086
If yes, describe the mean(s) by which the wastewater from the treatment works is discharged or transported to the other treatment
works (e g , tank truck, pipe)
If transport is by a party other than the applicant, provide
Transporter name
Mailing Address
Contact person
Title
Telephone number
For each treatment works that receives this discharge, provide the following
Name
Mailing Address
Contact person
Title
Telephone number
If known, provide the NPDES permit number of the treatment works that receives this discharge
Provide the average daily flow rate from the treatment works into the receiving facility
mgd
e Does the treatment works discharge or dispose of its wastewater in a manner not included in
A 8 a through A 8 d above (e g , underground percolation, well injection)? Yes No
If yes, provide the following for each disposal method
Description of method (including location and size of site(s) if applicable)
Annual daily volume disposed of by this method
Is disposal through this method continuous or intermittent?
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 4 of 21

FACILITY NAME AND PERMIT NUMBER
Columbus WWTP NC 0021369
Form Approved 1114199
OMB Number 2040-0086
WASTEWATER DISCHARGES -
If you answered "yes" to question A 8.a, complete questions A 9 through A 12 once for each outfall (including bypass points) through
which effluent is discharged Do not include Information on combined sewer overflows in this section If you answered "no" to question
A.8 a, go to Part B, "Additional Application Information for Applicants with a Design Flow Greater than or Equal to 0 1 mgd "
A 9 Description of Outfall.
a
Outfall number 001
b
Location Columbus
28722
(City or town, if applicable)
(Zip Code)
Polk
INC
oup35
82
15 b" N
09' 56" W
(Latitude)
(Longitude)
c
Distance from shore (If applicable)
25 00 ft
d
Depth below surface (if applicable)
000 ft
e
Average daily flow rate
0 15 mgd
f Does this outfall have either an intermittent or a
periodic discharge?
If yes, provide the following information
Number of times per year discharge occurs
Average duration of each discharge
Average flow per discharge
Months in which discharge occurs
Yes No (go toA9g)
mgd
g Is outfall equipped voth a diffuser? Yes No
A 10. Description of Receiving Waters.
a Name of receiving water Unnamed tributary of White Oak Creek
b Name of watershed (if known) White Oak Creek
United States Soil Conservation Service 14-digit watershed code (if known)
c Name of State Management/River Basin (if known) Broad River Basin
United States Geological Survey 8-digit hydrologic cataloging unit code (if known)
d Critical low flow of receiving stream (if applicable)
acute cfs chronic
e Total hardness of receiving stream at critical low flow (if applicable) _
cfs
mg/I of CaCO3
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 5 of 21

FACILITY NAME AND PERMIT NUMBER-
Form Approved 1114 99
Columbus WWTP NC O021369
QN1a Nrrnber 2040 0086
A 11 Description of Treatment
a What levels of treatment are provided? Check all that apply
Primary Secondary
Advanced Other Descnbev
b Indicate fhe foTlowirig removal rates (as applicable)
Design BOD5 removal or Design CBOD, removal 85.00 °l
Design SS removal 8500
Design P removal
Design N removal 50, 00 ro/°
Other !°
G What type of dtsinfection is used for the effluent from this outfalJ? If disinfection varies by season, please describe
ChloOne gas
If disinfection is by chlorination �s dechTo6ration used for this outfall? V Yes No
d Does the treatment plant have post aera[ion? Yes No
A 12 Effluent, Testing Information All Applicants that discharge to waters of the US must, provide effluent testing data for the following
parameters Provide the indicated effluent testing required by the permitting authority for each outfall through which effluent is
discharged Do not include information on combined sewer overflows in this section All Information reported must be based on data
collected through analysis conducted using 40 CFR Part136' methods In addition, this data must comply with QA/QC requirements
of 40 CFR Part 136 and other appropriate QAIQC requirements for standard methods foranalytes not addressed by 40 CFR Part 136
At a minimum, effluent testing data must be based on at least three samples and must be no more than four and one-half years apart
Outfall number
PARAMETER
MAXIMUM DAILY VALUE
AVERAGE DAILY VALUE
Value
Units
Value
Units
Number of Samples
H Minimum)
6.00
9.0.
-
H (Maximum)
7E20
s u,
Flow Rate
067
MGD
015
MG
36500
Temperature (Whiter)
11400
C
10.00
C
7000
Temperature Summer
2600
1 C 12300
C
7000
For pR please report a minimum and a maximum daily vat
POLLUTANT'
MAXIMUM DAILY
AVERAGE DAILY DISCHARGE
ANALYTICAL
ML / MDL
DISCHARGE
METHOD
Conc;
Units
Conc
Units
Number of
Samples
CONVENTIONAL AND NONCONVENTIONAL COMPOUNDS
BJOC14EMICAL OXYGE-N
130D•5
2400
mg/L
408
mgfL
52.00
SM 5210 B
2 mg/L
DEMAND (Report anal
CBOD-6
FECAL COLTFORM
600,00
#1001mL
730
4100/mL
5200
SM 9222 D
1I100mL
TOTAL SUSPENDED SOLIDS (Tss)
17600
mg/L
493
mgtL
52,00
SM 2540 D
2 mg/L
END OF PART A.
REFER TO THE APPLICATION OVERVIEW TO DETERMINE WHICH OTHER PAINS OF FORM
2A YOU MUST COMPLETE
'EPA Form 3510 2A tRev 1 99) Replaces EPA forms 7550 6 & 7550-22 Page, 6 of 21

FACILITY NAME AND PERMIT NUMBER
Columbus WWTP INC 0021369
Form Approved 1114199
OMB Number 2040-0086
BASIC APPLICATION INFORMATION
PART B. ADDITIONAL APPLICATION INFORMATION FOR APPLICANTS WITH A DESIGN FLOW GREATER THAN OR
EQUAL TO 0.1 MGD (100,000 gallons per day).
All applicants with a design flow rate > 0 1 mgd must answer questions B 1 through B 6 All others go to Part C (Certification)
B.I. Inflow and Infiltration Estimate the average number of gallons per day that flow into the treatment works from inflow and/or infiltration
10,000 00 gpd
Briefly explain any steps underway or planned to minimize inflow and infiltration
New line in works for Mills Street, continuously cleaning and checking lines
B 2. Topographic Map. Attach to this application a topographic map of the area extending at least one mile beyond facility property boundaries
This map must show the outline of the facility and the foilovong information (You may submit more than one map if one map does not show
the entire area )
a The area surrounding the treatment plant, including all unit processes
b The major pipes or other structures through which wastewater enters the treatment works and the pipes or other structures through which
treated wastewater is discharged from the treatment plant Include outfalls from bypass piping, if applicable
c Each well where wastewater from the treatment plant is injected underground
d Wells, springs, other surface water bodies, and drinking water wells that are 1) within 1/4 mile of the property boundaries of the treatment
works, and 2) listed in public record or otherwise known to the applicant
e Any areas where the sewage sludge produced by the treatment works is stored, treated, or disposed
f If the treatment works receives waste that is classified as hazardous under the Resource Conservation and Recovery Act (RCRA) by
truck, rail, or special pipe, show on the map where that hazardous waste enters the treatment works and where it is treated, stored, and/or
disposed
B 3. Process Flow Diagram or Schematic Provide a diagram showing the processes of the treatment plant, including all bypass piping and all
backup power sources or redundancy in the system Also provide a water balance showing all treatment units, including disinfection (e g,
chlorination and dechlonnation) The water balance must show daily average flow rates at influent and discharge points and approximate daily
flow rates between treatment units Include a brief narrative description of the diagram
B.4 Operation/Maintenance Performed by Contractor(s)
Are any operational or maintenance aspects (related to wastewater treatment and effluent quality) of the treatment works the responsibility of a
contractor? _Yes ✓ No
If yes, list the name, address, telephone number, and status of each contractor and describe the contractor's responsibilities (attach additional
pages if necessary)
Name
Mailing Address
Telephone Number
Responsibilities of Contractor
8.5. Scheduled Improvements and Schedules of Implementation. Provide information on any uncompleted implementation schedule or
uncompleted plans for improvements that will affect the wastewater treatment, effluent quality, or design capacity of the treatment works If the
treatment works has several different implementation schedules or is planning several improvements, submit separate responses to question
B 5 for each (If none, go to question B 6 )
a List the outfall number (assigned in question A 9) for each outfall that is covered by this implementation schedule
b Indicate whether the planned improvements or implementation schedule are required by local, State, or Federal agencies
Yes ✓ No
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 7 of 21

FACILITY NAME AND PERMIT NUMBER
Form Approved 1114199
Columbus WWTP NC 0021369
OMB Number 2040-0086
c If the answer to B 5 b is "Yes," briefly describe, including new maximum daily inflow rate (if applicable)
d Provide dates imposed by any compliance schedule or any actual dates of completion for the implementation steps listed below, as
applicable For improvements planned independently of local, State, or Federal agencies, indicate planned or actual completion dates, as
applicable Indicate dates as accurately as possible
Schedule Actual Completion
Implementation Stage MM / DID / YYYY MM / DID / YYYY
— Begin construction
— End construction
— Begin discharge
—Attain operational level _/
e Have appropriate permits/clearances concerning other Federal/State requirements been obtained? _Yes No
Describe briefly
B.6 EFFLUENT TESTING DATA (GREATER THAN 0.1 MGD ONLY).
Applicants that discharge to waters of the US must provide effluent testing data for the following parameters Provide the indicated effluent
testing required by the permitting authority for each outfall through which effluent is discharged Do not include information on combined sewer
overflows in this section All information reported must be based on data collected through analysis conducted using 40 CFR Part 136
methods In addition, this data must comply with QA/QC requirements of 40 CFR Part 136 and other appropriate QA/QC requirements for
standard methods for analytes not addressed by 40 CFR Part 136 At a minimum, effluent testing data must be based on at least three
pollutant scans and must be no more than four and one-half years old
Outfall Number
POLLUTANT
MAXIMUM DAILY
AVERAGE DAILY DISCHARGE
DISCHARGE
ConcL
Units
Cone
Units
Number of
ANALYTICAL
ML / MDL
Samples
METHOD
CONVENTIONAL AND NONCONVENTIONAL COMPOUNDS
AMMONIA (as N)
1.60
mg/L
029
mg/L
52.00
SM 4500 D
0 1 mg/L
CHLORINE (TOTAL
RESIDUAL, TRC)
a 9.00
L�.
Ug/L
32.00
Ug/L
. 14000
SM 4500 Cl
0 05 mg/L
DISSOLVED OXYGEN
9.13
mg/L
6 81
mg/L
140.00
SM 4500 Og2001
0 1 mg/L
TOTAL KJELDAHL
1.00
mg/L
0.66
mg/L
2.00
EPA 351 2
0 5 mg/L
NITROGEN TKN
NITRATE PLUS NITRITE
24.30
ng/L
18.90
ng/L
2.00
SM 4500
2 0 mg/L
NITROGEN
OIL and GREASE
PHOSPHORUS (Total)
3.70
mg/L
250
mg/L
2.00
2007
005
TOTAL DISSOLVED
SOLIDS (TDS)
OTHER
END OF PART B.
REFER TO THE APPLICATION OVERVIEW TO DETERMINE WHICH OTHER PARTS OF FORM
2A YOU MUST COMPLETE
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 8 of 21

FACILITY NAME AND PERMIT NUMBER'
Form Approved 1114199
OMB Number 2040-0086
Columbus WWTP INC 0021369
BASIC APPLICATION INFORMATION
PART C. CERTIFICATION
All applicants must complete the Certification Section Refer to instructions to determine who is an officer for the purposes of this certification All
applicants must complete all applicable sections of Form 2A, as explained in the Application Overview Indicate below which parts of Form 2A you
have completed and are submitting By signing this certification statement, applicants confirm that they have reviewed Form 2A and have completed
all sections that apply to the facility for which this application is submitted
Indicate which parts of Form 2A you have completed and are submitting.
Basic Application Information packet Supplemental Application Information packet
Part D (Expanded Effluent Testing Data)
Part E (Toxicity Testing Biomonitonng Data)
Part F (Industrial User Discharges and RCRA/CERCLA Wastes)
Part G (Combined Sewer Systems)
ALL APPLICANTS MUST COMPLETE THE FOLLOWING CERTIFICATION
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 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
�,�r
Name and official title ? l : rt9-zj
Signature -
Telephone numberrg� "
a
Date signed
Upon request of the permitting authority, you must submit any other information necessary to assess wastewater treatment practices at the treatment
works or identify appropriate permitting requirements
SEND COMPLETED FORMS TO:
EPA Form 3510-2A (Rev 1-99) Replaces EPA forms 7550-6 & 7550-22 Page 9 of 21

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2/3/13
The Town of Columbus WWTP land application is permitted
under WQ#0016247, Synagro Western Piedmont, dated
November 17, 2017. Residuals from Columbus WWTP are
hauled to approved sites totaling 313.6 acres, which contain a
mix of pasture, hay, and row crop. Residuals are monitored for
non -hazardous characteristics, nutrients and metals, and lime
stabilized to a PH of 12 for 24 hours to satisfy pathogen and
vector requirements.
284 Boger Road, Mocksvdle, NC 27028
Phone [phone] Fax [phone]