NC0020443_Renewal (Application)_20220609

a�a STA7F a
ROY COOPER
Governor
ELIZABETH S.BISER
Secretary q""
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
June 09, 2022
Town of Columbia
Attn: Rhett White, Town Manager
PO Box 361
Columbia, NC 27925-0361
Subject: Permit Renewal
Application No. NC0020443
Columbia WWTP
Tyrrell County
Dear Applicant:
The Water Quality Permitting Section acknowledges the June 8, 2022 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. 150E-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.
Sincere I.
•3ri""
Wren hedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
�D =v North nCarolinagtonReg Depionaartml OHentke of 943 EnvironmentWashingt aonl Quality Square Mall I DivisionWashingto of Watern.ResourceNorth s
Carolina 27889
252946.6481

t
May 30,2022 RECEIVED
NCDEQ/DWR JUN 0 8' 2022
Attn;NPDES Unit
1617 Mail Service Center NCDEQIDWRINPDES
Raleigh,NC 27699-1617
Subject: Request for NPDES Renewal
NPDES Permit#NC0020443
Town of Columbia
Columbia WWTP
Tyrrell County
Dear NPDES Unit:
The Town of Columbia is submitting the renewal application package for NPDES#NCOO 20443. The
permit expiration date is November 30,2022. The renewal application package consists of:
• Cover letter
• Renewal application Form—EPA Form 3510-2A(Revised 3-19)with tables A,B,and D
• Topographic map
• Schematic of WWTP(with water balance)
• Plant Narrative
• Reduced Monitoring Data
The Town would like to make the following comment regarding the permit renewal:
• The Town would like to request reduction of monitoring frequencies for BOD5,TSS,NH3-N and
Enterococci as allowed by the October 22, 2012 guidance document. We are assuming that
Enterococci monitoring reduction guidelines would be the same as those for Fecal Coliform.The
attached data(summarized in the following table)indicates that the WWTP effluent has greatly
exceeded the minimum criteria for reduced monitoring. The data used for this 3-year analysis
was for the period of December 2021—January 2019.

Analysis of testing results for the past three years:
Percent of Monthly Average Limit
Parameter Monthly Limit 3-Year Average %of Limit
BOD5 7.0 mg/1 0.9 mg/1 13.2%
TSS 30.0 mg/L 7.8 mg/L 26.0%
Enterococci 35/colonies-100 ml 8.1 colonies/100m1 23%
NH3-N 2.0 mg/1 0.14 mg/1 7.0%
- Number of Samples Over 200%of Monthly Average Limit
Parameter 200%of Monthly Limit Number of Samples Over
BOD5 14 mg/1 2
TSS 60 mg/L 1
NH3-N 4.0 mg./L 1
- Number of Samples Over 200%of Weekly Average Limit
Parameter 200%of Weekly Limit Number of Samples Over
Enterococci 552 2
In addition to the exceptional test results,the Columbia WWTP is in compliancewith all other criteria listed
in Section B Approval Criteria of the October 22,2012 guidance document regarding reduction of
monitoring frequencies.
The Town appreciates the Division's effort to reduce the regulatory and monetary burden on systems that
strive consistently to provide exceptional wastewater treatment.We thank you for your consideration in
these matters. If you have any additional questions or comments,please call contact me at:252/796-2781
or [e-mail].
Since
Rhett White,Town Manager
Town of Columbia

1
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
Form U.S.Environmental Protection Agency
2.A =.EPA Application for NPDES Permit to Discharge Wastewater
NPDES NEW AND EXISTING PUBLICLY OWNED TREATMENT WORKS
SECTION 1.BASIC APPLICATION INFORMATION FOR ALL APPLICANTS(40 CFR 122.21(j)(1)and(9))
1.1 Facility name
Columbia WWTP
Mailing address(street or P.O.box)
PO Box 361
City or town State ZIP code
o Columbia NC 27925
Contact name(first and last) Title Phone number Email address
w Kenneth Coleson Public Works Director [phone] [e-mail]
c
Location address(street,route number,or other specific identifier) ❑Same as mailing address
w
604 N.Road Street Extension(NCSR 1209)
City or town State ZIP code
Columbia NC 27925
1.2 Is this application for a facility that has yet to commence discharge?
❑ Yes 4 See instructions on data submission 0 No
requirements for new dischargers.
1.3 Is applicant different from entity listed under Item 1.1 above?
❑ Yes 0 No 4 SKIP to Item 1.4.
Applicant name
Town of Columbia
Applicant address(street or P.O.box)
PO Box 361
City or town State ZIP code
Columbia NC 27925
Contact name(first and last) Title Phone number Email address
a Rhett White Town Manager [phone] rhett_townofcolumbia@yahoo
1.4 Is the applicant the facility's owner,operator,or both?(Check only one response.)
❑ Owner ❑ Operator ❑ Both
1.5 To which entity should the NPDES permitting authority send correspondence?(Check only one response.)
El Facility El Applicant
0 Facility and applicant
(they are one and the same)
1.6 Indicate below any existing environmental permits.(Check all that apply and print or type the corresponding permit
number for each.)
Existing Environmental Permits
❑ NPDES(discharges to surface ❑ RCRA(hazardous waste) ❑ UIC(underground injection
water) control)
NC0020443
o ❑ PSD(air emissions) ❑ Nonattainment program(CM) ❑ NESHAPs(CM)
rn
h ❑ Ocean dumping(MPRSA) ❑ Dredge or fill(CWA Section 0 Other(specify)
404)
Collection WQCS00232
EPA Form 3510-2A(Revised 3-19) Page 1

t i
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP 0MBNo.2040-0004
1.7 Provide the collection system information requested below for the treatment works.
Municipality Population Collection System Type
Served Served (indicate percentage) Ownership Status
Town of 690 100 %separate sanitary sewer 0 Own 0Maintain
Z 0 %combined storm and sanitary sewer ❑ Own 0 Maintain
Columbia
w 0 Unknown 0 Own 0 Maintain
co %separate sanitary sewer 0 Own 0 Maintain
combined storm and sanitary sewer 0 Own 0 Maintain
a0 Unknown 0 Own ❑ Maintain
oo %separate sanitary sewer 0 Own 0 Maintain
combined storm and sanitary sewer 0 Own 0 Maintain
E 0 Unknown 0 Own 0 Maintain
:3 %separate sanitary sewer 0 Own 0 Maintain
N %combined storm and sanitary sewer ❑ Own ❑ Maintain
c ❑ Unknown 0 Own ❑ Maintain
'r Total 690
Population
c� Served
Separate Sanitary Sewer System Combined Storm and
Sanitary Sewer
Total percentage of each type of 100 % 0
sewer line(in miles)
Z' 1.8 Is the treatment works located in Indian Country?
e
o D Yes El No
U
= 1.9 Does the facility discharge to a receiving water that flows through Indian Country?
co
,z c ❑ Yes ❑ No
1.10 Provide design and actual flow rates in the designated spaces. Design Flow Rate
0.600 mgd
1 i0
Annual Average Flow Rates(Actual)
a le cc
Two Years Ago Last Year This Year
c c 0.226 mgd 0.189 mgd 0.187 mgd
0`L Maximum Daily Flow Rates(Actual)
o Two Years Ago Last Year This Year
0.838 mgd 0.679 mgd 0.742 mgd
h 1.11 Provide the total number of effluent discharge points to waters of the United States by type.
o Total Number of Effluent Discharge Points by Type
CDT Combined Sewer Constructed
r a Treated Effluent Untreated Effluent Overflows Bypasses Emergency
Overflows
c
0 1 0 0 0 0
EPA Form 3510-2A(Revised 3-19) Page 2

1
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
Outfalls Other Than to Waters of the United States
1.12 Does the POTW discharge wastewater to basins,ponds,or other surface impoundments that do not have outlets for
discharge to waters of the United States?
❑ Yes 0 No 4 SKIP to Item 1.14.
1.13 Provide the location of each surface impoundment and associated discharge information in the table below.
Surface Impoundment Location and Discharge Data
Average Daily Volume Continuous or Intermittent
Location Discharged to Surface
Impoundment (check one)
❑ Continuous
gpd 0 Intermittent
❑ Continuous
gpd ❑ Intermittent
0 Continuous
y gpd ❑ Intermittent
t 1.14 Is wastewater applied to land?
2 ❑ Yes ❑ No 4 SKIP to Item 1.16.
c 1.15 Provide the land application site and discharge data requested below.
N Land Application Site and Discharge Data
Continuous or
Location Size Average Daily Volume Intermittent
Applied (check one)
co
0 Continuous
y acres gpd
— ❑ Intermittent
0
r) acresgpd 0 Continuous
0 ❑ Intermittent
acresgpd 0 Continuous
0 Intermittent
T1.16 Is effluent transported to another facility for treatment prior to discharge?
o ❑ Yes © No 4 SKIP to Item 1.21.
1.17 Describe the means by which the effluent is transported(e.g.,tank truck,pipe).
1.18 Is the effluent transported by a party other than the applicant?
❑ Yes ❑ No 4 SKIP to Item 1.20.
1.19 Provide information on the transporter below.
Transporter Data
Entity name Mailing address(street or P.O.box)
City or town State ZIP code
Contact name(first and last) Title
Phone number Email address
EPA Form 3510-2A(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
1.20 In the table below,indicate the name,address,contact information, NPDES number,and average daily flow rate of the
receiving facility.
Receiving Facility Data
0 Facility name Mailing address(street or P.O.box)
City or town State ZIP code
0
U
Contact name(first and last) Title
0
Phone number Email address
c NPDES number of receiving facility(if any) 0 None Average daily flow rate mgd
0 1.21 Is the wastewater disposed of in a manner other than those already mentioned in Items 1.14 through 1.21 that do not
d have outlets to waters of the United States(e.g., underground percolation,underground injection)?
❑ Yes 0 No 4 SKIP to Item 1.23.
0 1.22 Provide information in the table below on these other disposal methods.
Information on Other Disposal Methods
o Disposal Location of Size of Annual Average Continuous or Intermittent
Method Disposal Site Disposal Site Daily Discharge (check one)
Description Volume
A 0 Continuous
acres gpd 0 Intermittent
0 Continuous
acres gpd ❑ Intermittent
❑ Continuous
acres gpd 0 Intermittent
1.23 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(n)?(Check all that apply.
y Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
c ❑ Discharges into marine waters(CWA ❑ Water quality related effluent limitation(CWA Section
Section 301(h)) 302(b)(2))
E] Not applicable
1.24 Are any operational or maintenance aspects(related to wastewater treatment and effluent quality)of the treatment works
the responsibility of a contractor?
❑ Yes ❑ No+SKIP to Section 2.
1.25 Provide location and contact information for each contractor in addition to a description of the contractor's operational
and maintenance responsibilities.
Contractor Information
Contractor 1 Contractor 2 Contractor 3
0
Contractor name
(company name)
€ Mailing address
(street or P.O.box)
City,state,and ZIP
code
0 Contact name(first and
c, last)
Phone number
Email address
Operational and
maintenance
responsibilities of
contractor
EPA Form 3510-2A(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
SECTION 3. INFORMATION ON EFFLUENT DISCHARGES(40 CFR 122.21(j)(3)to(5))
3.1 Provide the following information for each outfall.(Attach additional sheets if you have more than three outfalls.)
Outfall Number 001 Outfall Number Outfall Number
State NC
County
Tyrell
City or town Columbia
Distance from shore 10D ft• ft. ft.
Depth below surface 10 ft• ft. ft.
Average daily flow rate 0.187 mgd mgd mgd
Latitude 3`° 55 18" NO
Longitude 7 ° 15 27" "LJ
3.2 Do any of the outfalls described under Item 3.1 have seasonal or periodic discharges?
o ❑ Yes r❑ No 4 SKIP to Item 3.4.
3.3 If so,provide the following information for each applicable outfall.
y Outfall Number Outfall Number Outfall Number
0
Number of times per year
c discharge occurs
a Average duration of each
o discharge(specify units)
Average flow of each
discharge mgd mgd mgd
Months in which discharge
occurs
3.4 Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑✓ Yes ❑ No 4 SKIP to Item 3.6.
3.5 Briefly describe the diffuser type at each applicable outfall.
0.
Outfall Number 001 Outfall Number Outfall Number
C,
34-ft instream diffuser
oassembly
vi 3.6 Does the treatment works discharge or plan to discharge wastewater to waters of the United States from one or more
d •
discharge points?
3 r ❑ Yes 0 No-*SKIP to Section 6.
EPA Form 3510-2A(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
SECTION 2.ADDITIONAL INFORMATION(40 CFR 122.21(j)(1)and(2))
Outfalls to Waters of the United States
iz
2.1 Does the treatment works have a design flow greater than or equal to 0.1 mgd?
rn
o El Yes ❑ No 4 SKIP to Section 3.
c 2.2 Provide the treatment works'current average daily volume of inflow Average Daily Volume of Inflow and Infiltration
and infiltration.
11,Soo gpd
w
Indicate the steps the facility is taking to minimize inflow and infiltration.
c Visual observations and investigations of cleanouts and pipes. Camera investigation. Point repairs as needed.
0
0
w
c
L 2.3 Have you attached a topographic map to this application that contains all the required information?(See instructions for
specific requirements.)
rn5
0 El Yes ❑ No
E 2.4 Have you attached a process flow diagram or schematic to this application that contains all the required information?
c co (See instructions for specific requirements.)
LLco
❑✓ Yes ❑ No
2.5 Are improvements to the facility scheduled?
❑ Yes 0 No 4 SKIP to Section 3.
Briefly list and describe the scheduled improvements.
0
0
1.
c
E
a- 2.
0
H 3.
4.
co
to 2.6 Provide scheduled or actual dates of completion for improvements.
Scheduled or Actual Dates of Completion for Improvements
Affected Attainment of
Scheduled Begin End Begin
Outfalls Operational
Improvement Construction Construction Discharge
(from above) (list outtall (MM/DD/YYYY) (MM/DD/YYYY) (MM/DD/YYYY) Level
number) (MM/DD/YYYY)
1.
2.
3.
4.
2.7 Have appropriate permits/clearances concerning other federal/state requirements been obtained?Briefly explain your
response.
❑ Yes ❑ No ❑ None required or applicable
Explanation:
EPA Form 3510-2A(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
3.7 Provide the receiving water and related information(if known)for each outfall.
Outfall Number 001 Outfall Number Outfall Number
Receiving water name Scuppernong River
Name of watershed,river,
c or stream system Pasquotank River Basin
U.S.Soil Conservation
Service 14-digit watershed
o code
61 Name of state
io
management/river basin
U.S.Geological Survey
8-digit hydrologic
cataloging unit code
Critical low flow(acute) cfs cfs cfs
Critical low flow(chronic) cfs cfs cfs
Total hardness at critical mg/L of mg/L of mg/L of
low flow CaCO3 CaCO3 CaCO3
3.8 Provide the following information describing the treatment provided for discharges from each outfall.
Outfall Number 001 Outfall Number Outfall Number
Highest Level of 0 Primary 0 Primary 0 Primary
Treatment(check all that 0 Equivalent to 0 Equivalent to 0 Equivalent to
apply per outfall) secondary secondary secondary
O Secondary 0 Secondary 0 Secondary
O Advanced ❑ Advanced 0 Advanced
O Other(specify) 0 Other(specify) 0 Other(specify)
0
0
fl Design Removal Rates by
Outfall
U,
D1
BODs or CBODO 90
TSS 85
0 Not applicable 0 Not applicable 0 Not applicable
Phosphorus
0 Not applicable 0 Not applicable 0 Not applicable
Nitrogen
Other(specify) 0 Not applicable 0 Not applicable 0 Not applicable
EPA Form 3510-2A(Revised 3-19) Page 7

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
3.9 Describe the type of disinfection used for the effluent from each outfall in the table below.If disinfection varies by
season,describe below.
c
0
U
= Outfall Number o01 Outfall Number Outfall Number
Disinfection type Chlorination
d
0
Seasons used All
Dechlorination used? 0 Not applicable ❑ Not applicable ❑ Not applicable
El Yes ❑ Yes ❑ Yes
❑ No ❑ No ❑ No
3.10 Have you completed monitoring for all Table A parameters and attached the results to the application package?
O Yes ❑ No
3.11 Have you conducted any WET tests during the 4.5 years prior to the date of the application on any of the facility's
discharges or on any receiving water near the discharge points?
❑ Yes ❑✓ No 4 SKIP to Item 3.13.
3.12 Indicate the number of acute and chronic WET tests conducted since the last permit reissuance of the facility's
discharges by outfall number or of the receiving water near the discharge points.
Outfall Number Outfall Number Outfall Number
Acute Chronic Acute Chronic Acute Chronic
Number of tests of discharge
water
Number of tests of receiving
water
3.13 Does the treatment works have a design flow greater than or equal to 0.1 mgd?
El Yes ❑ No 4 SKIP to Item 3.16.
3.14 Does the POTW use chlorine for disinfection,use chlorine elsewhere in the treatment process,or otherwise have
0' reasonable potential to discharge chlorine in its effluent?
❑ Yes-4 Complete Table B,including chlorine. ❑ No-4 Complete Table B,omitting chlorine.
3.15 Have you completed monitoring for all applicable Table B pollutants and attached the results to this application
package?
ElYes ❑ No
3.16 Does one or more of the following conditions apply?
• The facility has a design flow greater than or equal to 1 mgd.
• The POTW has an approved pretreatment program or is required to develop such a program.
• The NPDES permitting authority has informed the POTW that it must sample for the parameters in Table C,must
sample other additional parameters(Table D),or submit the results of WET tests for acute or chronic toxicity for
each of its discharge outfalls(Table E).
Yes 4 Complete Tables C, D,and E as
❑ a livable. El No 4 SKIP to Section 4.
pP
3.17 Have you completed monitoring for all applicable Table C pollutants and attached the results to this application
package?
❑ Yes ❑✓ No
3.18 Have you completed monitoring for all applicable Table D pollutants required by your NPDES permitting authority and
attached the results to this application package?
No additional sampling required by NPDES
ElYes ❑ permitting authority.
EPA Form 3510-2A(Revised 3-19) Page 8

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
3.19 Has the POTW conducted either(1)minimum of four quarterly WET tests for one year preceding this permit application
or(2)at least four annual WET tests in the past 4.5 years?
❑ Yes ❑ No 4 Complete tests and Table E and SKIP to
Item 3.26.
3.20 Have you previously submitted the results of the above tests to your NPDES permitting authority?
E] Yes ❑ No 4 Provide results in Table E and SKIP to
Item 3.26.
3.21 Indicate the dates the data were submitted to your NPDES permitting authority and provide a summary of the results.
Date(s)Submitted Summary of Results
(MM/DD/YYYY)
WET Testing not Required
as
c
co 3.22 Regardless of how you provided your WET testing data to the NPDES permitting authority,did any of the tests result in
c toxicity?
❑ Yes ❑ No 4 SKIP to Item 3.26.
4) 3.23 Describe the cause(s)of the toxicity:
=
m
w
3.24 Has the treatment works conducted a toxicity reduction evaluation?
❑ Yes ❑ No 4 SKIP to Item 3.26.
3.25 Provide details of any toxicity reduction evaluations conducted.
3.26 Have you completed Table E for all applicable outfalls and attached the results to the application package?
El Yes ❑ Not applicable because previously submitted
information to the NPDES .ermittin. authori .
SECTION 4.INDUSTRIAL DISCHARGES AND HAZARDOUS WASTES(40 CFR 122.21(j)(6)and(7))
4.1 Does the POTW receive discharges from SIUs or NSCIUs?
❑ Yes ❑✓ No SKIP to Item 4.7.
4.2 Indicate the number of SIUs and NSCIUs that discharge to the POTW.
R Number of SIUs Number of NSCIUs
U,
0
P. 4.3 Does the POTW have an approved pretreatment program?
❑ Yes ❑ No
-0
R 4.4 Have you submitted either of the following to the NPDES permitting authority that contains information substantially
identical to that required in Table F:(1)a pretreatment program annual report submitted within one year of the
coapplication or(2)a pretreatment program?
❑ Yes ❑ No 4 SKIP to Item 4.6.
4.5 Identify the title and date of the annual report or pretreatment program referenced in Item 4.4.SKIP to Item 4.7.
N
13
4.6 Have you completed and attached Table F to this application package?
❑ Yes ❑ No
EPA Form 3510-2A(Revised 3-19) Page 9

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
4.7 Does the POTW receive,or has it been notified that it will receive,by truck,rail,or dedicated pipe,any wastes that are
regulated as RCRA hazardous wastes pursuant to 40 CFR 261?
❑ Yes 0 No+ SKIP to Item 4.9.
4.8 If yes,provide the following information:
Annual
Hazardous Waste Waste Transport Method Amount of Units
Number (check all that apply) Waste
Received
❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
.c
0
d ❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
0
❑ Truck ❑ Rail
-0 ❑ Dedicated pipe ElOther(specify)
r4.9 Does the POTW receive,or has it been notified that it will receive,wastewaters that originate from remedial activities,
including those undertaken pursuant to CERCLA and Sections 3004(7)or 3008(h)of RCRA?
0
0 Yes ❑ No 4 SKIP to Section 5.
To
3 4.10 Does the POTW receive(or expect to receive)less than 15 kilograms per month of non-acute hazardous wastes as
specified in 40 CFR 261.30(d)and 261.33(e)?
❑ Yes+SKIP to Section 5. 0 No
4.11 Have you reported the following information in an attachment to this application:identification and description of the
site(s)or facility(ies)at which the wastewater originates;the identities of the wastewater's hazardous constituents;and
the extent of treatment,if any,the wastewater receives or will receive before entering the POTW?
❑ Yes ❑ No
SECTICN 5.COMBINED SEWER OVERFLOWS(40 CFR 122.21(j)(8))
5.1 Does the treatment works have a combined sewer system?
❑ Yes ❑r No+SKIP to Section 6.
5.2 Have you attached a CSO system map to this application?(See instructions for map requirements.)
`O ❑ Yes ❑ No
2 5.3 Have you attached a CSO system diagram to this application?(See instructions for diagram requirements.)
ccoi ❑ Yes ❑ No
EPA Form 3510-2A(Revised 3-19) Page 10

p
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
5.4 For each CSO outfall,provide the following information.(Attach additional sheets as necessary.)
CSO Outfall Number CSO Outfall Number CSO Outfall Number
City or town
0
P- State and ZIP code
0
DI
CD
County
A
0
Latitude ° °
o °
N Longitude °
Distance from shore ft. ft. ft.
Depth below surface ft. ft. ft.
5.5 Did the POTW monitor any of the following items in the past year for its CSO outfalls?
CSO Outfall Number CSO Outfall Number CSO Outfall Number
Rainfall ❑ Yes 0 No 0 Yes ❑ No 0 Yes ❑ No
0)
C
0 CSO flow volume ❑ Yes 0 No 0 Yes ❑ No 0 Yes ❑ No
CSO pollutant ❑ Yes ❑ No ❑ Yes ❑ No ❑ Yes ❑ No
o concentrations
0 Receiving water quality ❑Yes 0 No ❑ Yes ❑ No 0 Yes ❑ No
CSO frequency 0 Yes ❑ No ❑ Yes 0 No 0 Yes ❑ No
Number of storm events 0 Yes 0 No 0 Yes 0 No 0 Yes 0 No
5.6 Provide the following information for each of your CSO outfalls.
CSO Outfall Number CSO Outfall Number CSO Outfall Number
co
Number of CSO events in events events events
a the past year
a
c Average duration per hours hours hours
d event 0 Actual or 0 Estimated 0 Actual or❑ Estimated ❑Actual or 0 Estimated
W million gallons million gallons million gallons
o Average volume per event
co
c.,) 0 Actual or 0 Estimated 0 Actual or❑ Estimated 0 Actual or 0 Estimated
Minimum rainfall causing inches of rainfall inches of rainfall inches of rainfall
a CSO event in last year 0 Actual or 0 Estimated 0 Actual or 0 Estimated ❑Actual or 0 Estimated
EPA Fomi 3510-2A(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP OMB No.2040-0004
5.7 Provide the information in the table below for each of your CSO outfalls.
CSO Outfall Number CSO Outfall Number CSO Outfall Number
Receiving water name
Name of watershed/
stream system
d U.S.Soil Conservation 0 Unknown ❑Unknown 0 Unknown
Service 14-digit
watershed code
"> (if known)
Name of state
ce management/river basin
co U.S.Geological Survey 0 Unknown 0 Unknown 0 Unknown
8-Digit Hydrologic Unit
Code(if known)
Description of known
water quality impacts on
receiving stream by CSO
(see instructions for
exam•Ies
SECTION 6.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
6.1 In Column 1 below,mark the sections of Form 2A 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
❑ Section 1. Basic Application ❑ w/variance request(s) ❑ w/additional attachments
Information for All Applicants
0 Section 2:Additional w/topographic map Cl w/process flow diagram
Information ❑ wl additional attachments
w/Table A 0 wl Table D
Section 3: Information on ❑ w/Table B ❑ wl Table E
Effluent Discharges
❑ w/Table C ❑ w/additional attachments
CO Section 4:Industrial ❑ w/SIU and NSCIU attachments ❑ w/Table F
cn ❑ Discharges and Hazardous
o_ Wastes ❑ w/additional attachments
❑ Section 5:Combined Sewer CI wl CSO map ❑ w/additional attachments
Overflows
❑ w/CSO system diagram
Section 6:Checklist and
R Certification Statement ❑ w/attachments
Y 6.2 Certification Statement
u
d
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
Rhett White Town Manager
Signature " Date signed
511)))Z-L
EPA Form 3510-2A(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP 001 0M8No.2040-0004
TABLE A. EFFLUENT PARAMETERS FOR ALL POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number Value Units Value Units Samples Method, (include units)
Biochemical oxygen demand
0 ML
o BOD5 or 0 CBOD5 4.8 mg/L 0.25 mg/L 156 5210B-11 2.0 mg/L 2 MDL
(report one)
0 ML
Fecal coliform NA NA NA NA NA NA NA ❑MDL
Design flow rate 0.742 MGD 0.187 MG/I 365 1
pH(minimum) 6.8 S.U.
pH(maximum) 8.3 s.0
Temperature(winter) 11.6 Celcius 10.1 Celcius 180
Temperature(summer) 25.9 Celcius 24.8 Celcius 180
Total suspended solids(TSS) 18.0 mg/L 4.9 mg/L 156 2540D-11 2.5 mg/L MDL
' Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 13

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP 001 OMB No.2040-0004
TABLE B.EFFLUENT PARAMETERS FOR ALL POTWS WITH A FLOW EQUAL TO OR GREATER THAN 0.1 MGD
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Methods (include
Value Units Value Units Samples units)
CI ML
Ammonia(as N) 0.99 mg/L 0.10 mg/L 156 350.1 R2-93 0.04 mg/L O MDL
Chlorine 49.0 ug/L 21.9 ug/L 156 5M4500 ClG-2011 10 ug/L ❑ML
(total residual,TRC)2CI ML
❑MDL
Dissolved oxygen 18.5 mg/L 10.48 mg/L 156 SM 4500 0 G-2016 0.1 0 MDL
CI ML
Nitrate/nitrite 42.5 mg/L 26.4 mg/L 16 353.2 R2-93 0.1 mg/L O MDL
O ML
Kjeldahl nitrogen 3.4 mg/L 1.5 mg/L 16 351.2 R2-93 0.1 0 MDL
CI ML
Oil and grease NA NA NA NA NA NA NA ❑MDL
O ML
Phosphorus 3.4 mg/L 1.4 mg/L 16 365.4-74 0.1 O MDL
Cl ML
Total dissolved solids NA NA NA NA NA NA NA Cl MDL
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
2 Facilities that do not use chlorine for disinfection,do not use chlorine elsewhere in the treatment process,and have no reasonable potential to discharge chlorine in their effluent are not
required to report data for chlorine.
EPA Form 3510-2A(Revised 3-19) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110009845873 NC0020443 Columbia WWTP 001 OMB No.2040-0004
TABLE D.ADDITIONAL POLLUTANTS AS REQUIRED BY NPDES PERMITTING AUTHORITY
Maximum Daily Discharge Average Daily Dischar e
Pollutant Analytical ML or MDL
(fist) Value Units Value Units Number of Methods (include units)
Samples
❑ No additional sampling is required by NPDES permitting authority.
ML
Total Nitrogen 45.9 met. 20.1 mg/L 16 Calculated NA ❑MDL
ML
Enterococci 2420 100 mls 10.1 mis 156 Entero-IDX ies/100 ml O MDL
0 ML
Mercury net. Z't). net. 1 1631 2 ng/L 0 MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
0 MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
'Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or required
under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 23

1 f
Town of Co4urnbia
ne vent Wastewater Treatment Plant
wastc;.atc► o, if 1 M6p 604 Road St Est.
_•ice Columbia, NC
�1
Grit
Removal
375,000 gal. 3 75,000 gal
Oxidation (n ; _c� ,
ATinik • i Otidation
Ditch °Itch
R ftUrr d hit rated S ud
O.0 I" u.u,,
WO0 "CA
v.lrj3►Iii
t t,- I
65,000 gal. 65,000 gal 65,000 gal. b5.000 gai 040 w•60
Clarifier Clarifier Clarifier 4E...3 c lees Fier A
My •17 ny^ r't.4) •C.ic7
rwn
01 0-f b ex./is p,oyt .Netw s.
Mvn ML rt.,' rhl n
Art eared
udte
f
2 1bhp
Centrifuge
200,000 gal. 154,000gal. 52,000 gal. Return
Sludge Holding Sludge Holding Digester Activated
Tank Tank Tank Sludge
Pumps
ice+
2 50hp Verticle Turbine 2 5gph 12.000 gal.Effluent
Pumps Discharging To NeCIO Wastewater
300 kW 1
The Outfall Site FeeO Holding Tank
Emergency Pumps
Generator
je
Lh rated E" uent
este..ate,

Town of Columbia Outfall Site
0,05,3406 Green St. v 05 3 M bo
Columbia, NC
11,500 gal. 11,500 gal.
Post Post
Aeration Aeration
Basin Basin
Sodium Bisulfate
Feed Chamber
o, I0-
10,000 gal.
65 kW I Sodium Bisulfate
Emergency Dechlorination
Generator Tank
2 2.5 gph Chemical
eed Diaphram Pumps
2 20 hp Verticle Turbine Pumps
Discharging To The Scuppernong River
Dechlorinated Treated
Wastewa er
v, IiP i',6•n

i f
•
Town of Columbia WWTP
Treatment Plant Narrative
NPDES#NC0020443
The Town of Columbia WWTP is a conventional wastewater treatment plant utilizing the activated
sludge process. The facility is permitted for 0.600 mgd and has an average daily flow of 0.187
mgd. The facility receives wastewater flow from the Town of Columbia.
The WWTP consists of the following major units:
• Influent flow meter
• Mechanical bar screen
• Manual bar screen (bypass)
• Aerated grit removal
• Dual oxidation ditches—375,000 gallons each
• Four secondary clarifiers —65,000 gallons each
• One RAS Tank — 10,000 gallons
• One aerated sludge holding tank—200,000 gallons
• One aerated sludge holding tank— 154,000 gallons
• One sludge digester—52,000 gallons
• Effluent pump station with Chlorination/Dechlorination dosing and chemical contact
o One chlorine contact tank— 12,000 gallons
o Two post aeration basins — 11,500 gallons each
o One dechlorination tank
• Outfall pump station
• Flow meter—effluent
• 34-ft instream effluent diffuser assembly
• Standby generator
Preliminary Treatment
As the flow enters the facility it is screened. The physical process of wastewater treatment begins
with screening out large items that have found their way into the sewer system, and if not removed,
can damage pumps and impede water flow. After passing through the screens, the flow enters the
aerated grit chamber where sand is settled. Excessive sand entering the treatment process can
cause excessive wear on pump parts,clog lines and valves, and deposit on the bottom of the basins.
The flow then goes to a splitter box which controls flow to the two oxidation ditches.

Secondary Treatment
From preliminary treatment the influent flows to the oxidation ditches for biological treatment.
The oxidation ditches have a capacity of 375,000 gallons each. Aeration in the ditches supplies
the oxygen necessary for biological treatment in the form of mechanical aeration and secondly,the
rotor imparts the velocity necessary to mix and move the wastewater around the d itch to the point
of discharge. The primary function of the oxidation ditches is to provide the necessary
environment and time to encourage the breakdown of any organic material (and the growth of the
bacteria), as well as ensure there is enough time for the organic material to be broken down. This
process is managed to offer the best conditions for bacterial growth.
Water is discharged from the two oxidation ditches flows into four secondary clarifiers. The
clarifiers have a capacity of 65,000 gallons each. Quiescent conditions in the clarifiers provide an
environment for the separation of solids and water. The incoming "mixed liquor" is discharged
around the periphery of each clarifier near the water surface via a narrow raceway. The settled
activated sludge is returned to the oxidation ditches(Return Activated Sludge or RAS)to increase
the bacterial concentration,help in propagation, and accelerate the breakdown of organic material.
The RAS pump rate is set to maintain a sludge blanket of approximately three feet in the clarifier.
To maintain the proper amount of activated sludge in the oxidation ditch,a portion of the settled
sludge will be removed (Waste Activated Sludge or WAS)from the treatmentprocess bypumping
g g P P g
a portion of the RAS to the sludge digester.
Disinfection
The clear effluent from the clarifiers flows to the effluent holding tank from where it is chlorinated
as it is pumped to the two post aeration basins. The disinfected effluent is aerated prior to
dechlorination in the dechlorination tank.
Discharge
After dechlorination,the effluent is pumped to the Scuppernong River and is discharged via a 32-
foot diffuser assembly.
Solids Handling
Wasted activated sludge is pumped to the aerobic digester for stabilization. The stabilized sludge
will be pumped to the sludge holding tanks for addition stabilization prior to final disposal.

1 ,
, _ ......--..... -66 ;,. /4Wilf/ ..
..
.:::...--..:.4 .._....e...., 7.'. -.I. ."OW/
Outfa11001 '_ f
"�
(with diffuser) ApproximateFacility Boundary
/ ' i ihr.
(flows NW)
1{ r
II
II
--— .\
C
7 -.......... _ , I
I 0 ill*
I4111111P7 E>
Road Street Ext. 1- / /
Downstream Sampling Point NCSR 1209
[marker#10] 111
35°55'23"N/76° 15'40" W ••of (E'
�, tzar ..,' _
•
41i,
•
,,,.
.__
'�sk,N,F;isio....Oyu
Fo .. ,,,
.... . • .
.. j
____
.*.
, "_
. .... .. •
COI,UMBJ • _
\ "'�? ♦ '• CO • BI • l
. -r. itit' '''-' Piling.•� �..E� L�l1t� 1 c
\ of . ' _.ari-•1 - r. i�__ '� • "..
�R ti
a
_to
_ it ,14,„ „if,
, .. .. _ _, ,
1 ... iv ..„...„;.......--p,/... __ .. ,
• US Hiiivr,,, ,wy 64 w
©
.N\- Upstream Sampling Point ( ®
(US Hwy 64 Bridge] . - '
35°55'02"N/76° 15'20" W `o� .-- .. •-
\.' ,. .
\0 NC Hwy 94 P , /
) -��
,.....
.,
Scuppernong River \rt
.__Y.' c9 ��, _
-, [flows northwest] `. '�', eM
7 .. . • . (ics)e.i.
,
, )
..,. ... -
Town of Columbia WWTP Facility i ,- s
604 N. Road Street Extension (NCSR 1209), Columbia - _fir' t ti'{ `
Location - • - , - -?-E
Scale 1:24,000 '
eceiving Stream: Scuppernong River Stream Segment: 30-14-4-(9)
rainage Basin: Pasquotank River Basin Sub-Basin: 03-01-53
atitude: 35°55' 18" Longitude: 76°15'27"
:ream Class: SC HUC: 03010205 North NPDES Permit NC0020443
ate Grid/USGS Ouad: D33NE/Columbia West,NC
T t.
J

w •
tD
CD W
.: CI C CD
_! M
D O Z v' 0 Z v' _ O Z to _
O " :: T o O D Jv n a D fD �' NJ cam, ¢ D °' Jv
�. K ro r<o h c a zv 6 o rD r* c v o CD ro c` o� o
H ^ °� 3 N • �. n 3 ° � c„ ,< rroo ='• n cu °c' N co 3 3 a" 3 c -< m < �, n c °c, N
3 r. K .r CT CT rD tT ,., - 7- , .� CT Q' rD or ,.F 7' ,1 CT CS ft. tT ,N.r — = -, ,� �"''
,_: CD ei ro < -, r-D ro -2 a) fD -, rD
CD 0 D
t 7 <
CD
F. < v
N CD DV
co
tm
C 3-
CD
CD
Co Co Co C
o o F, 00 o o 0000 � 0 o 0 o o o o on.) o W 0o 0 o 000000o 6 060 0 CD
F-� iv O O W 0 i-+ A �J O N O to O O O A VD A w 0 in F, 0 w w 0 0 0 0 to to O A i+ V
W V O O, 1-, 0o O W O 00 to ry 0 A 0 < 0 tD O O O V O o A 0 0 to < N O, O O O O O O, 0 0 0, 0 < v
N 0 N (D tD rD a)
Z r.
CO CO CO -0 CU
N N O N O N Q, W O N W 0 0 V 0 0 0 A A 00 N O, NJ 0 N N O O O O W A O N N NJ0 m c
N V 0 O V O N t0 O, O VD l0 ou. g O N O O O O, to 0 to 0 i-' - 3 A A 0 0 0 0 O, 0o O 0o O 00 3 N 3
D, m JJ, 3
X X X
—I —4 -I c °'
W Q, In A Q, In V Q, Ql ----I O, VDH A tD N LC) O, O, N W N CT) V V Vf to W W W W W NJ W A V LIDtGA N/J 0
ON, O V CO O F. F. 01 VD F. A in CD .c, Tx IN iv v in U.) in i, i , 4, 41 1--, D 00 CD iv O iv VD i-. iD i u Q, N D A
0 00 M r<o r<D w 0
O_
-I -4 -I C
00 00 V V tD (ID CO /-' ~ E-" UN, vyi 0° N.) 1- F, CFIA I-, F- .' VI V u, A (.0V to ao U i CO F'LA, tN/f 3
co
W N V In 00 O O W 0 0 0 g O O O CD '' V CD CD O CD CD CD 3 W Cr)F'' , iv Co ID A W O O O 3 a
O DJ tL Cu d
X X X
m m m
,-' A V tD A NJ W A U) MI. W O, V tD ~O W to W Ui W W 1--, P NJ F... 1-, to lti ,,f4 00 F, W 00 00 tD ;'r
NJ LO 00 U O O� VD O, O, F, V W N to N tD tD up •A W lD N 00 W A A < V O Q, N �, �, 00 In Co V ix) F+ <
(DC NJ (D JD
m m N N m
1- 1-- NJ A 'e v ,"' W A N VD 00 O, N W lD '•
„ A CO W tD to 1W-, A V V FW+ ID Q, O 0 O O, 0O W O'' N Ui
A 1-. I . 0 0 O O 0 O O O O O O 0 0 3
Y Y Y
Z Z Z
= I I
0 0 0 0 0 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 0 0 0 0 0 W o 0 0 0 0 0 0 0 0 0 0 o w
O N F-, F, 1--, NJN N N M O -, V D O O O O O In O O O O O F, > O F-+ 1--, F, 1--, F, O O O O 1-+ F, >
O tD W (J.; ,1 O, W A U,) V tD A CO f<D V to co O, CO tD tD tD V O, V F, < 00 CD CD CD CD NJO V 00 , to O, 0, f<D
V NJ
0 0 A
Z Z Z
0 0 0 00 0 0 0 1--` 0 0 )-, t=M 0 0 0 O O V 0 0 0 0 0 0 t= O O o 0 0 0 0 0 0 0 0 0u.)
I I
W A N 0 W OA, UUi en . ON 00 A U 3 L.0 V W N W W CO CO A W V W Cu mW 0 V A U, 1N-' OW in 1--, CO 0 LLD
X X X