NC0021369_Permit Issuance_20080829

NPDES DOCUHENT- !MANNIN`: COVER !SHEET
NPDES Permit:
NC0021369
Columbus WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Return
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
August 29, 2008
This document is printed on reuse paper - ignore any
content on the re'rerse side

Michael F. Easley. Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
August 29, 2008
Tim Holloman, Town Manager
Town of Columbus
P.O. Box 146
Columbus, North Carolina 28772
Subject: Issuance of NPDES
Permit NC0021369
Town of Columbus WWTP
Polk County
Dear Mr. Holloman:
Coleen H. Sullins Director
Division of Water Quality
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to
the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as
subsequently amended).
This permit includes no major changes from the draft permit sent to you on July 2, 2008.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to
you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of
this letter. This request must be in the form of a written petition, conforming to Chapter 150E of the North Carolina
General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North
Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to
obtain other permits which may be required by the Division of Water Quality or permits required by the Division of
Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may
be required. If you have any questions concerning this permit, please contact Bob Guerra at telephone number
[phone].
Coleen H. Sullins
Encrosure: NPDES Permit NC0021369
cc: Central Files
Asheville Regional Office / Surface Water Protection
NPDES Unit
Aquatic Toxicity Unit
N r Carolina •
:Naturally
North Carolina Division of Water Quality
Internet: www.ncwaternnatitv.org
1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal opportunity/Affirmative Action Employer-50% Recyced/10% Post Consumer Paper

Permit NC0021369
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other
lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act,
as amended,
Town of Columbus
is hereby authorized to discharge wastewater from a facility located at the
Columbus WWTP
355 Levi Road
Polk County
to receiving waters designated an a unnamed tributary to Whiteoak Creek in the Broad
River Basin,
in accordance with effluent limitations, monitoring requirements, and other conditions
set forth in Parts I, II, III and IV hereof.
This permit shall become effective October 1, 2008.
This permit and authorization to discharge shall expire at midnight on July 31, 2013.
Signed this day August 29, 2008.
s
oleen H. Sullins, Director
i� ivision of Water Quality -
By Authority of the Environmental Management Commission

Permit NC0021369
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge
are hereby revoked. As of this permit issuance, any previously issued permit bearing
this number is no longer effective. Therefore, the exclusive authority to operate and
discharge from this facility arises under the permit conditions, requirements, terms, and
provisions included herein.
The Town of Columbus is hereby authorized to:
1. Continue to operate an existing 0.80 MGD wastewater treatment plant consisting of
the following:
• Manus aI Bar screen
• Extended aeration
• Four,(4)15 Hp aerators
• Clarifier
• Chlofiination / Dechlorination
• Sludge holding
• Recirculating pump station
• Sludge thickening
This facility is located at the Town of Columbus Wastewater Treatment Plant at 355
Levi Road Extension in Columbus in Polk County.
2. Discharge from said treatment works at the location specified on the attached map
into an unnamed tributary to Whiteoak Creek classified C waters in the Broad River
Basin.

I l ` •
;/ Fox Mtn Rd N9
Town of Columbus
Columbus WWTP
Latitude:
Longitude:
Receiving Stream:
Stream Class:
35° 15' 13" N State Grid:
82° 09' 56" W Permitted Flow:
UT Whiteoak Creek Drainage Basin:
C Sub -Basin:
Mill Spring, NC
0.800 MGD
Broad River Basin
03-08-02
' . l
-
Outfall 001
NPDES Permit No. NC0021369
Polk County

Permit NC0021369
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is
authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee
as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location
Flow
0.800
MGD
Continuous
Recording
Influent or
Effluent
BOD, 5 day, 20°C'
30.0 mg/L
45.0 mg/L
Weekly
Composite
Influent &
Effluent
Total Suspended Solids
30.0 mg/L
45.0 mg/L
Weekly
Composite
Influent &
Effluent
NH3 as N
Weekly
Composite
Effluent
Fecal Coliform
(geometric mean)
200/100 ml
400/100 ml
Weekly
Grab
Effluent
Dissolved Oxygen
Weekly
Grab
Effluent
Temperature (°C)
Weekly
Grab
Effluent
Total Residual Chlorines
28pg/L
2/Week
Grab
Effluent
pH3
Weekly
Grab
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
2/Year
Composite
Effluent
Total Phosphorus
2/Year
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Silver
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Total Cadmium
5.4 ug/L
15.0 ug/L
2/Month
Composite
Effluent
Total Cyanide
13.5 ug/L
22.0 ug/L
2/Month
Grab
Effluent
Total Lead
33.8 ug/L
2/Month
Composite
Effluent
Total Mercury
32.3 ug/L
2/Month
Composite
Effluent
Chronic Toxicity"
Quarterly
Composite
Effluent
Notes:
1. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15
percent of the respective influent value (85 percent removal).
2. The Division shall consider all effluent TRC values reported below 50 ug/L to be in compliance with
the permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory (including field certified), even if these values fall below 50 ug/L.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Chronic toxicity (Ceriodaphnia) P/F test at 37% shall be conducted in March, June, September, and
December. See attachment A. (2.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0021369
A. (2). CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 37%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of March, June, September, and December. Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment
processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase I1 Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring
Form (MR-1) for the months in which tests were performed. If reporting pass/fail results using the parameter code
TGP3B, DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results using the
parameter code THP3B, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: NC DENR / DWQ / Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30 days
after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation of No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address cited
above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include
altemate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & ail AT Forms
submitted.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid
test and will require immediate follow-up testing to be completed no later than the last day of the month following the
month of the initial monitoring.

Permit NC0021369
A. (3). AERATION BASIN HYDRAULIC STUDY
No later than 180 days after the effective date of this permit, (November 1, 2008), the Permittee shall
submit to the Asheville Regional Office, Surface Water Protection, a study addressing the hydraulic
capacity of the aeration basin at the WWTP.

PUBLIC NOTICE
STATE OF NORTH CAROLINA
• ENVIRONMENTAL MANAGEMENT
COMMISSION/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
NOTIFICATION OF INTENT TO ISSUE
A NPDES WASTEWATER PERMIT
On the basis of thorough staff
review and application of NC General
Statute 143.215.1 and 15A NCAC
02H.0109and other lawfulstandards
and regulations, the North Carolina
Environmental Management Com-
mission proposes to issue a National
Pollutant Discharge Elimination Sys-
tem (NPDES) wastewater discharge
permit to the person(s) listed below
effective 45 days from the publish
date of this notice.
Written comments regarding the
proposed permit will be accepted
until 30 days after the publish date
of this notice. All comments received
prior to that date are considered in
the final determinations regarding
the proposed permit. The Director
of the NC Division of Water Quality
may decide to hold a public meeting
for the proposed permit, should the
Division receive a significant degree
of public interest.
Copies of the draft permit and
other supporting information on file
used to determine conditions present
in the draft permit are available upon
request and payment of the costs of
reproduction. Mail comments and/
or requests for information to the NC
Division of Water Quality atthe above
address or call Dina Sprinkle (919)
733-5083, extension 363 atthe Point
Source Branch. Please include the
NPDES permit number (below) in any
communication. Interested persons
may also visit the Division of Water
Quality at 512 N. Salisbury Street,
Raleigh, NC 276041148 between the
hours of 8:00 a.m. and 5:00 p.m. to
review information on file.
Carolina Yarn Processors (P.O.
Box 1579, Tryon, NC 28782) has
applied for renewal of NPDES permit
NC0048305 for its water -treatment
operation in Tryon,
NC. This permitted facility dis-
charges filter -backwash wastewater
to an unnamed tributary to the North
PacoletRiver in the Broad River Basin.
This discharge may affect future al-
locations in this portion of the North
Pacolet River.
Pavillion International (241 Pavil-
lon Place, Mill Spring, NC 28756)
has applied for renewal of NPDES
-' permit NC0085294 for its Britten
Creek WWTP. This permitted facility
dischargestreated domestic wastewa-
- ` ter to Britten Creek in the Broad River
Basin. Currentlytotal residual chlorine
is water quality limited. This discharge
may affect future allocations in this
portion of Britten Creek.
The Town of Columbus (P.O. Box
146, Columbus, NC 28722) has
applied for renewal of NPDES permit
NC0021369 for its WWTP in Polk
County. This permitted facility dis-
chargestreated domesticwastewater
to an unnamed tributaryto White Oak
Creek in the Broad River Basin. Cur-
rentlyfecal coliform and total residual AVIT OF PUBLICATION
chlorine are water quality limited.
This discharge may affect future al- ;dersignecl, a Notary Public of said County
locations in this portion of the Broad ammissior:ed, c ualifed, and authorized by
River basin.
adv. 7/7
'TA — POLK COUNTY.
oaths, personally appeared
L 1 '• ".: . -_._who being first duly sworn, deposes
and says: that She is Lmil, LAO A—) of THE
TRYON DAILY BULLETIN, engaged in the publication of
a newspaper known as THE TRYON DAILY BULLETIN,
published, issued, and entered as second class mail in the
Town of Tryon, in said County and State; that he is au-
thorized to make this affidavit and sworn statement; that
the notice or other legal advertisement, a true copy of
which is attached hereto. was published in THE TRYON
DAILY BULLETIN on the following dates:
or
and that the said newspaper in which such notice, paper,
document, or legal advertisement was published was, at the
time of each and every such publication, a newspaper meet-
ing all of the requirements and qualifications of Section
1-597 of the General Statutes of North Carolina and was a
qualified newspaper within the meaning of Section 1-597
of the General Statutes of North Carolina.
This- - .day of_
4
(Signature o person making affidavit)
Swr.:n to and subscribed before me, this —
day of
g
(Notary Public)
My Cors.3nission•-

Columbus WWTP NC0021369
Subject: Columbus WWTP NC0021369
From: John Giorgino <[e-mail]>
Date: Wed, 11 Jun 2008 09:41:59 -0400
To: Bob Guerra <[e-mail]>
CC: Cindy A Moore <[e-mail]>
Hi Bob, in response to your inquiry about Cu/Zn RP for Columbus WWTP; the facility
did not have a non -compliant tox test for the 9 month period following the 2
non -compliant tests (3/07, 4/07) that triggered the initial request for analysis.
Option 3 (TIE analysis) was chosen by the facility, and additional samples were taken
to run a TIE if a non -compliant test occurred. As of right now, no further action
concerning Cu/Zn limits are requested by us.
John Giorgino
Environmental Biologist
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
Mailing Address:
1621 MSC
Raleigh, NC 27699-1621
Office: 919 743-8441
Fax: [phone]
1 of 1
6/11/2008 11:41 AM

STAFF REPORT
TO: Susan Wilson
FROM: Roy Davis
DATE: May 23, 2008
Lir
SUBJECT: NPDES Permit Renewal
Town of Columbus
Wastewater Treatment Plant
NPDES Permit Number NCO21369
Polk County
i ITT
The Town of Columbus is served by an extended aeration WWTP having a rated
capacity of 0.8 MGD. The plant is thirty-five years old and consists of a
mechanically cleaned bar screen, aeration basin with five surface aerators, a
single circular clarifier, gas chlorination, liquid dechlorination, sludge thickener,
and two sludge holding ponds (only one of which is routinely used). The plant is
being well operated. Sludge is disposed of by land application.
A study conducted by the Town and Rural Water revealed that thirty-five years of
operation without influent grit removal has resulted in an accumulation of
approximately three feet of solids in the aeration basin. Consider, prior to permit
renewal, asking the Town to conduct a study and inform us of the hydraulic
capacity of the aeration basin. The results of such a study may prompt us to re -
rate the plant.
G:IWPDATA\DEMWQ\POLK121369 Columbus WWTP\Permit Renewal Staff Report.08.doc

Pretreatment Program Info Database
printed on:
5/12/2008
for Program Name Columbus, Town of
WWTP Name Town of Columbus
Program Approval Date
Pretreatment Status
Region
County
NPDES Number
NPDES Effective Date
NPDES Expire Date
POTW is Primary WWTP
Design Flow mgd
WWTP SIU's
WWTP CIU's
date Inactive
10/19/1994
0
0
07/01/1983
Inactive
ARO
Polk
NC0021369
11/30/1998
TRUE
0.8000
Program SIUs
Program CIUs
Stream Information Iwc % 37.10
7Q10 Flow cfs /mgd 2.1
Stream Classification C
Basin Number BRD02
Receiving Stream Name UT WHITEOAK CREEK
/ 1.36
Last PAR Rec
Current Fiscal
Year PCI Done
Last Audit on
Design mgd is SIU permitted
0
0
Date Next Due
Date Received by DWQ
Date Approved
Adopt Date Required
Date Adopted
HWA
01/01/2999
0.00
03/23/1993
b4/10/1987 03/26/1993
PAR Due Date
Audit Year Next
Permitted SIU flow (mgd) [Pt_SIU)
mercury
1631
required
yes
Info in this Box from Pt Contacts
PT_Pro
Formal Name g.Prime Phonel
ext
Fax
Date
Attended
HWA Wksp
Date
Attended
IUP Wksp
Date
Attended
PAR Wksp
Date
Attended Subject of
Specialty Specialty
Wksp Wksp
(Pretreatment Related NOVs from DWQ
DWQ Central Office Contact
DWQ Regional Contact
Sarah Morrison
Keith Haynes

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0021369
Facility Information
Applicant/Facility Name:
Town of Columbus/Columbus WWTP
Applicant Address:
P.O. Box 146; Columbus, North Carolina 28722
Facility Address:
355 Levi Road Extension; Columbus, North Carolina 28722
Permitted Flow
0.80 MGD
Type of Waste:
Domestic (100%)
Facility/Permit Status:
Class II /Active; Renewal
County:
Polk County
Miscellaneous
Receiving Stream:
UT to White Oak
Creek
Regional Office:
Asheville (ARO)
Stream Classification:
C
State Grid / USGS Quad:
Mill Springs, NC
303(d) Listed?
Subbasin:
No
03-08-02
Permit Writer:
Date:
Bob Guerra
May 12, 2008
Drainage Area (mi`):
4.5
Summer 7Q10 (cfs)
Winter 7Q10 (cfs):
2.1
N/A
30Q2 (cfs)
Average Flow (cfs):
IWC (%):
N.A
6.8
37%
Lat. 35° 15' 13" N Long. 82° 09' 56" W
SUMMARY
The Town of Columbus currently operates a 100% Municipal Wastewater Treatment Plant with permitted flows
of 0.800 MGD. The existing WWTP consists of:
• Influent lift station
• Manual bar screen
• Extended aeration
• Four 15 Hp floating aerators
• Clarifier
• Aerobic sludge digester
• Thickeners and belt press
• Chlorination
• De -chlorination and
• Continuous flow measurement.
The Town contracts with Precision Land Application, Inc. for land application of its sludge under Permit number
WQ-0002645.
A new De -chlorination system, utilizing Calcium Thio-sulfate has been added since last permit renewal.
EXISTING PERMIT CONDITIONS
The discharge from the facility currently has limits for flow, BOD, TSS, ammonia, fecal coliform, pH, and TRC.
Facility monitors and reports for Nitrogen, Phosphorus, copper, silver, zinc, cadmium, cyanide, lead, total
mercury and tests for whole effluent toxicity.
Fact Sheet
Town of Columbus NC0021369 Renewal
Page I

RECEIVING STREAM
The headwaters of Whiteoak Creek drain the Town of Columbus. Habitat problems associated with development
and stormwater runoff were noted throughout the entire Whiteoak Creek watershed and included sedimentation,
loss of pool habitat, unstable banks, narrow riparian zones and frequent breaks in the riparian zone. Stormwater
issues also need to be addressed by the Town of Columbus.
PRETREATMENT
The facility has no permitted discharging Industries and no pretreatment program.
CORRESPONDENCE
• Jan 16, 2006 — Permit Mod issued for changing mercury sampling from composite to grab
• Oct 9, 2006 — ATC Issued for minor changes to facility
ARO Inspections
3-23-05 — Compliance inspection
o 11-02-05 — sampling inspection
o 2-22-06 — compliance inspection
8-3-07 — Technical Assistance site visit
COMPLIANCE SUMMARY: BASED ON PREVIOUS 5 YEARS
During the current permit period, the facility has had one
11/18/2006.
In March of 2006 and 2007, the facility had failed chronic
reflected compliance with existing aquatic toxicity requirements
TOXICITY TESTING:
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
MonitoringSchedule: March,June,September, and December
P
This facility had failures of toxicity tests during March 2006 and March 2007 with subsequent additional testing
indicating the facility retumed to compliance in June of 2006 and 2007 respectively. Facility received an NOV ON
6-22-07 stating the need to address possible sources of Copper and Zinc impacts on failing toxicity tests.
violation for Fecal coliform, which occurred on
toxicity tests but subsequent monitoring events
Chronic Pass/Fail
001: Chronic ChV @ 37%
001: Chronic ChV @ 375%
A 6-11-08 email from John Giorgino, Aquatic Toxicology Section, stated "The facility did not have a non-
compliant tox test for the 9-month period following the 2 non -compliant tests (3-07 & 4-07) that triggered the
initial request for an analysis. Option 3 (TIE analysis) was chosen by the facility, and additional samples were
taken to run a TIE if a non -compliant test occurred. As of right now, no further action concerning Cu/Zn limits is
requires by us."
DMR DATA REVIEW: (5-2003 / 5-2007)
MONTHLY AVG
HIGH VALUE
LOW VALUE
FLOW (MGD)
.195
.273
.133
BOD (MG/L
7.337
41
<2
TSS
10.05
43
1.5
FECAL COLIFORM
54.48
964
1.0
Fact Sheet
Town of Columbus NC0021369 Renewal
Page 2

REASONABLE POTENTIAL ANALYSIS
Reasonable potential analysis was conducted for: Cd, Cu, Cn, Pb, Hg, Ag, and Zn (see table below).
PARAMETER
RPA results
Monitoring
Limits
Chronic Acute
Daily max
Weekly average
Cadmium
No Yes
2 / Month
15.0 ug/L
5.4 ug/L
Copper
Yes Yes
Monthly
N/A Monitor only
N/A Monitor only
Cyanide
Yes Yes
2 / Month
22.0 ug/L
13.5 ug/L
Lead
Yes Yes
2 / Month
33.8 ug/L
67.3 ug/L
Mercury
Yes Yes
2 / Month
N/A Monitor only
32.3 ug/L
Silver
Yes Yes
Monthly
N/A Monitor only
N/A Monitor only
Zinc
Yes Yes
Monthly
N/A Monitor only
N/A Monitor only
Reasonable potential was found for Cd, Cu, Cn, Pb, Hg, Ag, and Zn.
Reasonable potentlal was found for copper, silver, and zinc. These are all state action level standards, and
are only to be limited if the facility begins to run into toxicity problems. They will continue to be monitored through
the NPDES permit
PROPOSED CHANGES:
Monitoring Frequencies:
• Cd, Cn, Pb, and Hg will have their existing Quarterly Monitoring Frequencies changed to 2/Month.
Limits:
• Added Cd - Daily Max 15.0 ug/L and Weekly Avg 5.4 ug/L
• Added Cn;- Daily Max 22.0 ug/L and Weekly Avg 13.5 ug/L
• Added Pb - Daily Max 33.8 ug/L
• Added Ag - Weekly Avg 32.3 ug/L
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: July 16, 2008
Permit Scheduled to Issue: September 16, 2008(est)
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
Town of Columbus NC0021369 Renewal
Page 3

REASONABLE POTENTIAL ANALYSIS
Town of Columbus WWTP
NC0021369
Time Period March 2004 - March 2008
Qw (MGD) 0.8
7010S (cfs) 2.1
7010W (cfs) 0
3002 (cfs) 0
Avg. Stream Flow, QA (cfs) 0
Reeving Stream UT to Whiteoak Creek
WWTP Class 11
IWC(%) 7Q10S 37.126
@ 7010W WA
30Q2 WA
@ QA WA
Stream Class C
Outfall 001
Ow = 0.8 MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WOS/
Chronic
KFAV/
Acute
n
fps Max Fred Cw Allowable Cw
Cadmium
NC
2
15
ug/L
17
2
7.9
Acute:
_ _
Chronic:
15.00
_ _
5.39
RP = NO DAILY MAX LIMIT ADDED
_ _ _ _ _ 1_5_119/L______ _______,
RP = YES WKY AVG LIMIT ADDED
5.4 uq/L
Copper
NC
7.0
AL
7.3
ug/L
41
32
86.4
Acute:
Chronic:
7.30
18.85
RP = YES
NC action level, monitoring only
RP = YES
NC action level, monitoring only
Cyanide
NC
5
N
22
10
ug/L
17
12
30.2
Acute:
_
Chronic:
22.00
_ _
13.47
RP = YES DAILY MAX LIMIT ADDED
_ 22U _.0 t/L _ _ _ _
RP = YES WKY AVG LIMIT ADDED
13.5 uq/L
Lead
NC
25
N
34
ug/L
21
3
100.5
Acute:
Chronic:
33.80
67.34
RP = YES DAILY MAX LIMIT ONLY
______33.80_u_g/L _______
RP = NO
Mercury
NC
12
2
ng/L
15
15
76.4
Acute:
Chronic:
N/A
32.32
RP = N/A
RP = YES WKY AVG LIMIT ONLY
32.3 ug/L
Silver
NC
0
AL
1.23
ug/L
49
2
6.3
Acute:
Chronic:
1.23
0.16
RP = YES
NC action level, monitoring only
RP = YES
NC action level, monitoring only
Zinc
NC
50
AL
67
ug/L
40
37
256.5
Acute:
Chronic:
67.00
RP = YES
NC action level, monitoring only
134.68
RP = YES
NC action level, monitoring only
' Legend:
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
Freshwater Discharge
21369 npdes rpa (6.11-08).xis, rpa
6/11/2008

Table 1. Project Information
Facility Name
WWTP Grade
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
Time Period
Data Source(s)
Town of Columbus WWTP
11
NC0021369
001
0.8
UT to Whiteoak Creek
C
2.1
March 2004 - March 2008
Table 2. Parameters of Concern
ParO i
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Name
Type Chronic Modifier Acute PQL Units
Cadmium
- NC
2
15
ug/L
Copper
NC
7
AL
7.3
ug/L
Cyanide
NC
5
N
22
10
ug/L
Lead
NC
25
N
33.8
ug/L
Mercury
.NC
12
2.0
ng/L
Silver
NC
0.06
AL
1.23
ug/L
Zinc
NC
50
AL
67
ug/L
21369 npdes rpa (6-11-08).xls, input
6/11/2008

REASONABLE POTENTIAL ANALYSIS
Cadmium
Copper
Date Data BDL=1/2DL Results
1 3/1/2004 < 1.00 0.5 Std Dev, 0.8880
2 5/10/2004 < 1.00 0.5 Mean 1.0882
4 8/17/2004 1.00 1.0 C.V. 0.8160
511/23/2004 2.00 2.0 n 17
6 2/15/2005 < 5.00 2.5
7 5/10/2005 < 5.00 2.5 Mult Factor = 3.1600
8 8/9/2005 < 5.00 2.5 Max. Value 2.5 ug/L
9 11/1/2005 < 1.00 0.5 Max. Pred Cw 7.9 ug/L
10 2/8/2006 < 1.00 0.5
11 5/16/2006 < 1.00 0.5
12 8/1/2006 < 1.00 0.5
1311/9/2006 < 5.00 2.5
16 2/20/2007 < 1.00 0.5
17 5/15/2007 < 1.00 0.5
19 8/7/2007 < 1.00 0.5
20 12/20/2007 < 1.00 0.5
21 2/5/2008 < 1.00 0.5
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Interpolate to find Mult. Factor
Date Data BDL=1/2DL Results
1 3/1/2004 19.00 19.0 Std Dev. 9.9642
2 4/5/2004 7.00 7.0 Mean 14.9512
4 4/26/2004 14.00 14.0 C.V. 0.6664
5 5/17/2004 5.00 5.0 n 41
6 6/21/2004 11.00 11.0
77/12/2004 9.00 9.0 Mult Factor = 1.9200
8 8/17/2004 10.00 10.0 Max. Value 45.0 ug/L
9 9/21/2004 25.00 25.0 Max. Pred Cw 86.4 ug/L
1010/19/2004 39.00 39.0
11 11/23/2004 37.00 37.0
1212/14/2004 38.00 38.0
131/4/2005 45.00 45.0
14 2/15/2005 21.00 21.0
15 3/8/2005 18.00 18.0
16 4/12/2005 18.00 18.0
17 5/10/2005 15.00 15.0
18 6/7/2005 18.00 18.0
20 7/6/2005 < 10.00 5.0
21 8/9/2005 14.00 14.0
23 9/20/2005 < 10.00 5.0
2410/11/2005 < 10.00 5.0
25 11/1/2005 16.00 16.0
26 12/ 13/200 5 18.00 18.0
27 1/4/2006 16.00 16.0
28 2/8/2006 15.00 15.0
29 3/7/2006 18.00 18.0
30 4/18/2006 14.00 14.0
31 5/16/2006 17.00 17.0
32 6/6/2006 12.00 12.0
33 7/ 11 /2006 14.00 14.0
34 8/1/2006 16.00 16.0
35 9/4/2006 < 10.00 5.0
36 9/5/2006 < 10.00 5.0
3710/24/2006 < 10.00 5.0
3811/9/2006 < 5.00 2.5
4011/24/2006 < 5.00 2.5
41 12/5/2006 13.00 13.0
42 1 / 16/2007 15.00 15.0
43 2/20/2007 13.00 13.0
44 3/13/2007 13.00 13.0
45 4/10/2007 < 10.00 5.0
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Interpolate to find Mult. Factor
-1-
21369 npdes rpa (6-11-08).xls, data
6/11/2008

REASONABLE POTENTIAL ANALYSIS
Cyanide
Lead
Date Data BDL=1/2DL Results
1 4/5/2004 < 5.00 5.0 Std Dev. 3.6872
2 4/9/2004 < 5.00 5.0 Mean 7.2941
3 8/17/2004 < 5.00 5.0 C.V. 0.5055
4 11/23/2004 < 5.00 5.0 n 17
5 2/15/2005 < 5.00 5.0
6 5/10/2005 12.00 12.0 Mutt Factor = 2.1600
7 8/9/2005 4.40 5.0 Max. Value 14.0 ug/L
8 11/10/2005 4.80 5.0 Max. Pred Cw 30.2 ug/L
9 2/8/2006 14,00 14.00
10 5/16/2006 12.00 12.00
11 8/8/2006 3,90 5.00
12 11/9/2006 0.00 5.00
15 2/20/2007 5,70 5.00
16 5/15/2007 13.00 13.00
18 8R/2007 3.60 5.00
19 11/6/2007 13.00 13.00
22 2/5/2008 9.00 5.00
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
Interpolate to find Mutt. Factor Cyanide)
n = 17 12 Hit(s)
Date Data BDL=1/2DL Results
1 3/1/2004 < 5.00 2.5 Std Dev. 4.4304
2 5/10/2004 < 2.00 1.0 Mean 3.2214
3 5/31/2004 < 2.00 1.0 C.V. 1.3753
4 8/17/2004 < 2.00 1.0 n 21
511/23/2004 3.00 3.0
6 2/15/2005 < 5.00 2.5 Mult Factor = 4.5700
7 5/10/2005 < 5.00 2.5 Max. Value 22.0 ug/L
8 8/9/2005 < 5.00 2.5 Max. Pred Cw 100.5 ug/L
911/1/2005 22.00 22.0
10 2/8/2006 < 5.00 2.5
11 5/16/2006 < 5.00 2.5
12 8/1/2006 < 5.00 2.5
1311/9/2006 < 2.50 1.3
14 11/23/2006 < 2.50 1.3
15 11/24/2006 < 2.50 1.3
16 2/20/2007 5.90 5.9
17 5/15/2007 < 5.00 2.5
18 5/28/2007 < 5.00 2.5
19 8/7/2007 < 5.00 2.5
2012/20/2007 < 5.00 2.5
21 2/5/2008 < 5.00 2.5
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
-2-
21369 npdes rpa (6-11-08).xls, data
6/11/2008

REASONABLE POTENTIAL ANALYSIS
Mercury
Silver
Date Data BDL=1/2DL Results
1 5/25/2004 4.36 4.4 Std Dev. 7.1238
2 9/30/2004 8.08 8.1 Mean 10.0760
3 11/29/2004 16.00 16.0 C.V. 0.7070
4 2/15/2005 9.60 9.6 n 15
5 6/14/2005 26.00 26.0
6 11/15/2005 2.90 2.9 Mult Factor = 2.9400
7 2/8/2006 19.00 19.0 Max. Value 26.0 ng/L
8 6/6/2006 4.40 4.4 Max. Pred Cw 76.4 ng/L
9 8/29/2006 2.30 2.3
10 11/9/2006 19.00 19.0
11 3/20/2007 13.00 13.0
12 5/22/2007 3.40 3.4
13 8/7/2007 5.10 5.1
1411/6/2007 8.20 8.2
15 2/5/2008 9.80 9.8
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date Data BDL=1/2DL Results
1 7/6/2005 < 5.00 2.50 Std Dev. 0.5978
2 8/9/2005 < 5.00 2.50 Mean 2.5255
3 9/5/2005 < 5.00 2.50 C.V. 0.2367
4 9/20/2005 < 5.00 2.50 n 49
510/11/2005 < 5.00 2.50
6 11/1/2005 < 5.00 2.50 MuIt Factor = 1.2600
7 1/1/2006 < 5.00 2.50 Max. Value 5.0 ug/L
8 1/2/2006 < 5.00 2.50 Max. Pred Cw 6.3 ug/L
91/4/2006 < 5.00 2.50
101/16/2006 < 5.00 2.50
11 2/8/2006 < 5.00 2.50
12 3/7/2006 < 5.00 2.50
13 4/18/2006 < 5.00 2.50
14 5/16/2006 < 5.00 2.50
15 6/6/2006 < 5.00 2.50
16 7/4/2006 < 5.00 2.50
17 7/11/2006 < 5.00 2.50
18 8/1/2006 < 5.00 2.50
19 9/4/2006 < 5.00 2.50
20 9/5/2006 < 5.00 2.50
21 10/24/2006 < 5.00 2.50
22 11/9/2006 < 2.50 1.25
23 11/23/2006 < 2.50 1.25
24 11/24/2006 < 2.50 1.25
2512/5/2006 < 5.00 2.50
2612/25/2006 < 5.00 2.50
2712/26/2006 < 5.00 2.50
281/1/2007 < 5.00 2.50
291/15/2007 < 5.00 2.50
301/16/2007 < 5.00 2.50
31 2/20/2007 < 5.00 2.50
32 3/13/2007 < 5.00 2.50
33 4/10/2007 < 5.00 2.50
34 5/15/2007 < 5.00 2.50
35 5/28/2007 < 5.00 2.50
36 6/5/2007 < 5.00 2.50
37 7/3/2007 < 5.00 2.50
38 7/4/2007 < 5.00 2.50
39 8/7/2007 < 5.00 2.50
40 9/3/2007 < 5.00 2.50
41 9/5/2007 < 5.00 2.50
4210/2/2007 < 5.00 2.50
4311/6/2007 < 5.00 2.50
4412/4/2007 5.00 5.00
451/1/2008 5.00 5.00
461/3/2008 < 5.00 2.50
471/21/2008 < 5.00 2.50
48 2/5/2008 < 5.00 2.50
49 3/11/2008 < 5.00 2.50
50
51
52
53
54
55
56
57
58
59
60
199
200
-3-
21369 npdes rpa (6-11-08).xis, data
6/11/2008

REASONABLE POTENTIAL ANALYSIS
Zinc
Date Data BDL=1/2DL Results
1 3/8/2005 39.00 39.0 Std Dev. 42.6844
2 4/12/2005 42.00 42.0 Mean 81.7000
3 5/10/2005 70.00 70.0 C.V. 0.5225
4 6/7/2005 40.00 40.0 n 40
5 7/6/2005 84.00 84.0
6 8/9/2005 < 30.00 15.0 Mult Factor = 1.7100
7 9/20/2005 37.00 37.0 Max. Value 150.0 ug/L
8 10/11/2005 49.00 49.0 Max. Pred Cw 256.5 ug/L
911/1/2005 62.00 62.0
1012/13/2005 76.00 76.0
11 1/4/2006 97.00 97.0
12 2/8/2006 130.00 130.0
13 3/7/2006 150.00 150.0
14 4/18/2006 30.00 30.0
15 5/16/2006 150.00 150.0
16 6/6/2006 120.00 120.0
17 7/11/2006 96.00 96.0
18 8/1/2006 120.00 120.0
19 9/4/2006 < 30.00 15.0
20 9/5/2006 < 30.00 15.0
21 10/24/2006 30.00 30.0
2211/9/2006 0.00 0.0
2312/5/2006 77.00 77.0
241/16/2007 64.00 64.0
25 2/20/2007 87.00 87.0
26 3/13/2007 54.00 54.0
27 4/10/2007 47.00 47.0
28 5/15/2007 100.00 100.0
29 6/5/2007 57.00 57.0
30 7/3/2007 88.00 88.0
31 8R/2007 140.00 140.0
32 9/5/2007 110.00 110.0
33 10/2/2007 140.00 140.0
34 11/6/2007 120.00 120.0
35 11/22/2007 120.00 120.0
36 11/23/2007 120.00 120.0
37 12/4/2007 120.00 120.0
381/3/2008 97.00 97.0
39 2/5/2008 140.00 140.0
40 3/11/2008 120.00 120.0
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
-4-
21369 npdes rpa (6-11-08).xls, data
6/11/2008

TOWN OF COLUMBUS
P.O. BOX 146
COLUMBUS, NORTH CAROLINA 28722
828-894-8236
FAX: [phone]
Frances Candelaria
NC DENR/DWQ
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Town of Columbus WWTP
Town of Columbus
Polk County
NPDES Permit Renewal Application—NC0021369
Dear Mrs. Candelaria:
s FEB 1 2008 L.
The Town of Columbus, NC requests renewal of NPDES Permit NC 0021369. The
previous permit renewal was effective August 2003. Since that date, the following
changes have taken place at the Town of Columbus WWTP:
1. Addition of a De -chlorination Unit, consisting of a pumping unit and holding tank,
containing Calcium Thio-sulfate, to remove chlorine from the effluent. This enables the
WWTP to maintain a chlorine residual of less than 28 micrograms as required by
DENR/DWQ, which became effective July 2005.
The Town of Columbus contracts with Percision Land Application, Inc. for disposal of
sludge produced by the WWTP. This is under Permit number WQ 0002645.
Please find the NPDES Form 2A application for renewal attached.
Thank yo.},l.
4`1
Sincerely,
Tim Holloman
Town Manager
Town of Columbus
1-828-894-8236

FACILITY NAME AND PERMIT NUMBER:
Columbus, NC, NC0021369
Renewal
Broad
BASIC APPLICATION INFORMATION
PART A. BASIC APPLICATION INFORMATION FOR ALL APPLICANTS:
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 POB 146
Columbus, NC 28722
Contact Person Robert Rosseter
' Title WWTP ORC
/
Telephone Number [phone]
Facility Address 355 Levi Road
(not P.O. Box) Columbus, NC 28722
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 Tim Holloman
Title Town Manager/Permittee
Telephone Number [phone]
Is the applicant the owner or operator (or both) of the treatment works?
X owner 0 operator
Indicate whether correspondence regarding this permit should be directed to the facility or the applicant.
0 facility X 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 1058 Separate Municipal
Total population served 1058
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 2 of 22

FACILITY NAME AND PERMIT NUMBER:
COLUMBUS NC, NC0021369
RENEWAL
BROAD
A.5. Indian Country.
a. Is the treatment works located in Indian Country?
❑ Yes x 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 x 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 lof 'this year occurring no more than three months prior to this application submittal.
a. Design flow rate 0.800 mgd
b. Annual averagedaily
c. Maximum daily flow rate
Two Years Acto
0.171 MGD
0.325 MGD
Last Year This Year
0.161 MGD 0.158 MGD
0.238 MGD 0.276 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.
x Separate sanitary sewer 100 %
0 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.? x Yes ❑ No
If yes, list how many of each of the following types of discharge points the treatment works uses:
i. Discharges of treated effluent
ii. Discharges of untreated or partially treated effluent
1
0
iii. Combined sewer overflow points 0
iv. Constructed emergency overflows (prior to the headworks)
0
v. Other 0
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.? 0 Yes
If yes, provide the following for each surface impoundment:
Location:
x No
Annual average daily volume discharge to surface impoundment(s) mgd
Is discharge 0 continuous or ❑ intermittent?
c. Does the treatment works land -apply treated wastewater? 0 Yes x 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 x No
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 3 of 22

FACIUTY NAME AND PERMIT NUMBER:
COLUMBUS NC NC0021369
RENEWAL
BROAD
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:
9
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. through A.8.d above (e.g., underground percolation, well injection): ❑ Yes x 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 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 22

FACILITY NAME AND PERMIT NUMBER:
COLUMBUS NC NC0021369
RENEWAL
BROAD
WASTEWATER DISCHARGES:
If you answered "Yes" to question A.8.a, complete auestions 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 355 LEVI ROAD 28722
(City or town, if applicable)
POLK
(Zip Code)
NC
(County) (State)
35' 15' 13" 82' 09' 56"
(Latitude)
c. Distance from shore (if applicable)
d. Depth below surface (if applicable)
25
0
(Longitude)
ft.
ft.
e. Average daily flow rate 0.158 mgd
f. Does this outfall have either an intermittent or a periodic discharge? ❑ Yes X No (go to A.9.g.)
g•
If yes, provide the following information:
Number f times per year discharge occurs:
Average duration of each discharge:
Average flow per discharge:
Months in which discharge occurs:
Is outfall equipped with a diffuser?
A.10. Description of Receiving Waters.
a. Name of receiving water
b. Name of watershed (if known)
mgd
❑ Yes X No
UNKNOWN TRIBUTARY TO THE WHITE OAK CREEK
WHITE OAK CREEK
United States Soil Conservation Service 14-digit watershed code (if known):
c. Name of State Management/River Basin (if known):BROAD
United States Geological Survey 8-digit hydrologic cataloging unit code (if known):
d. Critical low flow of receiving stream (if applicable)
acute cfs chronic cfs
e. Total hardness of receiving stream at critical low flow (If applicable): mg/I of CaCO3
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 5 of 22

FACILITY NAME AND PERMIT NUMBER:
COLUMBUS NC, NC0021369
RENEWAL
BROAD
A.11. Description of Treatment
a. What level of treatment are provided? Check all that apply.
x Primary x Secondary
❑ Advanced 0 Other. Describe:
b. Indicate the following removal rates (as applicable):
Design BOD5 removal or Design CBODS removal 85 %
Design SS removal 85
Design P removal N/A
Design N removal 50 %
Other %
c. What type of disinfection is used for the effluent from this outfall? If disinfection varies by season, please describe:
CHLORINE GAS
If disinfection is by chlorination is dechlorination used for this outfall? X Yes 0 No
Does the treatment plant have post aeration? 0 Yes X 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 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 samples and must be no more than four and one-half years apart.
Outfall number: 001
PARAMETER
MAXIMUM DAILY VALUE
AVERAGE DAILY VALUE
Value
Units
Value
Units
Number of Samples
pH (Minimum)
6.9
s.u.
pH (Maximum)
7.2
s.u.
Flow Rate
.276
MGD
.158
MGD
365
Temperature (Winter)
16
c
12.3
c
51
Temperature (Summer)
25
c
24
c
51
• For pH please report a minimum and a maximum daily value
POLLUTANT
MAXIMUM DAILY
DISCHARGE
AVERAGE DAILY DISCHARGE
ANALYTICAL
METHOD
L/MDL
M
Conc.
Units
Conc.
1—
Units
Number
Samplesf
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
BIOCHEMICAL OXYGEN
BOD5
12.3
Mg/I
7.4
Mg/I
51
Sm5210b
2 mg/I
DEMAND (Report one)
CBOD5
FECAL COLIFORM
87.8
#/100m1
4.5
#/100m
51
Sm9222D
1/100ML
TOTAL SUSPENDED SOLIDS (TSS)
13.6
Mg/I
9.5
Mg/I
51
SM2540D
2.0 Mg/I
END OF PART A.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) 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 6 of 22

FACILITY NAME AND PERMIT NUMBER:
COLUMBUS NC, NC0021369
RENEWAL
BROAD
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 z 0.1 mgd must answer questions B.1 through 8.6. All others go to Part C (Certification).
B.1. Inflow and Infiltration. Estimate the average number of gallons per
10.000 gpd
day that flow into the treatment works from inflow and/or infiltration.
infiltration.
Briefly explain any steps underway or planned to minimize inflow and
Replaced 7.6 miles of collection line in 2006
Began camera/video maintenance of Collection System in 2007
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 following 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''/+ 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 the hazardous waste enters the treatment works and where it is treated, stored, and/or disposed.
B.3. Process Row Diagram or Schematic. Provide a diagram showing the processes of the treatment plant, including all bypass piping and all
backup power sources or redunancy in the system. Also provide a water balance showing all treatment units, including disinfection (e.g.,
chlorination and dechlorination). 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 X 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:
B.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.
0 Yes X No
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 7 of 22

FACILITY NAME AND PERMIT NUMBER:
COLUMBUS NC, NC0021369
RENEWAL
BROAD
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
Stage MM/DDIYYYY MM/DD/YYYY
Implementation
Begin Construction / / / /
-
End Construction / / / /
-
Discharge / / / /
- Begin
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 combine 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 QAIQC 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 on -half years old.
Outfall Number: 001
MAXIMUM DAILY
DISCHARGE
AVERAGE DAILY DISCHARGE
ANALYTICAL
MLIMDL
POLLUTANT
Conc.
Units
Conc.
Units
Number of
Samples
METHOD
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
AMMONIA (as N)
5.4
Mg/1
2.4
MgII
51
SM4500D
0.1 mg/1
CHLORINE (TOTAL
RESIDUAL, TRC)
<28
UgII
>28
Ug/I
203
SM4500CLG
0.05mg/I
DISSOLVED OXYGEN
6.0
Mg/I
5.1
Mg/1
203
SM45000G
0.lmgll
TOTAL KJELDAHL
NITROGEN (TKN)
1.1
Mg/I
0.8
Mgll
2
EPA351.2
0.5mg/I
NITRATE PLUS NITRITE
NITROGEN
15
Mg/1
8.7
Mg/1
2
SM4500F
2.0mgll
OIL and GREASE
PHOSPHORUS (Total)
2.3
MgII
1.52
Mg/I
2
SM4500P
0.05mg/I
TOTAL DISSOLVED SOLIDS
(TDS)
OTHER
END OF PART B.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) 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 22

FACILITY NAME AND PERMIT NUMBER:
eecam,Ct/s //G NC, c0.2 /3C %
PERMIT ACTION REQUESTED:
,�c7JEw'A L
RIVER BASIN:
Ro R
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:
A( Basic Application Information packet Supplemental Application Information packet:
❑ Part D (Expanded Effluent Testing Data)
❑ Part E (Toxicity Testing: Biomonitoring 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 far 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 submitti false information, including the possibility of fine and imprisonment
for knowing violations.
'X /� 1 /47/r`i �r
Name and official title �� �r;I`/ // �6
Signature 1 /7/:,------....-..... \
Telephone number (r..?)T) ,' 'V " 7,3 J
Date signed /— i' Off
Upon request of the permitting authority, you must submit any other information necessary to assure wastewater treatment practices at the treatment
works or identify appropriate permitting requirements.
SEND COMPLETED FORMS TO:
NCDENR/ DWQ
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22. Page 9 of 22

MANUAL
BAR SCREEN
NOTES:
FLOW DIAGRAM
COLUMBUS, N.C.
WASTEWATER TREATMENT PLANT
NPDES NC 0021369
EXTENDED AERATION PROCESS
.DESIGN CAPACITY 0.80 MGD
RTN SLUDGE
Mow
AERATION
(NOTE 1)
0.8
MGD
SLUDGE
HOLDING
(NOTE 2)
SHEET
PILING
1. FLOATING AERATORS:
1-25 HP (12-18 HRS/DAY)
4-15 HP (6-10 HRS/DAY
2. FLOATING AERATORS
1-25 HP (3-5 HRS/WEEK
1-30 HP (3-5 HRS/WEEKS
3. FLOATING AERATORS
1-30 HP (3-5 HRS/WEEK)
RECIRC.
PUMP
STATION
CLARIFIER
0.8
MGD
SLUDGE
SLUDGE 0.4
HOLDING '
(NOTE 3) MG
SLUDGE
THICKENING
Now
5-6% D.S.
CHLORINATION
0.8
MGD
U.T.
WHITE
OAK
CREEK
L V
2000 GALLON 40 AC
TANKER TRUCK LAND APPLICATION
SITE
3- 8 HR DAYS/WK

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
Basic Information to determine potential for expedited perms renewal
Reviewer/Date
S
Permit Number
A de- Do 2-11769
Facility Name
,o f w d �, W e
Basin Name/Sub-basin number
IM4a./ 01- A - A 2-
Receiving Stream
(AT 1,,Ii M4-
Stream Classification in Permit
e
Does permit need NH3 limits?
d/
Does permit need TRC limits?
M)
Does permit have toxicity testing?
L./AA
Does permit have Special Conditions?
N0
Does permit have instream monitoring?
/k
Is the stream impaired (on 303(d) list)?
/A)
Any obvious compliance concerns?
Any permit' mods since last permit?
4c)v % iC- WI
Existing expiration iration date
o' - M — u 9
New expiration date
u 7 - 3 q - t3
New permit effective date
Miscellaneous Comme is
AtGt4
YES
This is a SIMPLE EXPEDITED permit renewal (administrative
renewal with no changes, or only minor changes such as TRC, NH3,
name/ownership changes). Include conventional WTPs in this group.
YES_ j' This is a MORE COMPLEX EXPEDITED permit renewal (includes
Special Conditions (such as EAA, Wastewater Management Plan), 303(d)
listed, toxicity testing, instream monitoring, compliance concerns, phased
limits). Basin Coordinator to make case -by -case decision.
YES This permit CANNOT BE EXPEDITED for one of the following reasons:
• Major Facility (municipal/industrial)
• Minor Municipals with pretreatment program
• Minor Industrials subject to Fed Effluent Guidelines (lb/day limits for BOD, TSS,
etc)
• Limits based on r onable potential analysis (metals, GW remediation organics)
• Permitted flow > 0.5 (requires full Fact Sheet)
• Permits determined by Basin Coordinator to be outside expedited process
TB Version 8/18/2006 (NPDES Server/Current Versions/Expedited Fact Sheet)