NC0020389_Permit Issuance_20030924

Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
September 24, 2003
Mr. Keith Langdon
Town of Benson
P.O. Box 69
Benson, North Carolina 27504
Subject: Issuance of NPDES Permit NCO020389
Benson WWTP
Johnston County
Dear Mr. Langdon:
Division personnel have reviewed and approved your application for renewal of the subject permit. The Division
received comments regarding the draft permit from the Town and from the US EPA and is issuing the permit with
certain revisions. 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 May 9,
1994 (or as subsequently amended).
The following change has been made to the permit as the result of comments received:
• At the Town's suggestion, the upstream monitoring site has been moved to the culvert at NCSR 1158 in order to
better assess the impact of the treatment plant's discharge on the receiving stream.
The final permit also includes minor editorial changes and corrections. The most significant of these is the updated
language in Condition A.(8), Priority Pollutant Scan.
Regarding the Town's comment that the former Condition A. (8), Effluent Flow Monitoring was omitted from the
permit: This requirement is already contained in Condition A. (1) but was included in the previous permit for emphasis;
the Division no longer considers the special condition to be necessary and has deleted it from this permit.
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 150B 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 a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable except after notice to the Division of Water Quality. 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, the Division of Land Resources, the
Coastal Area Management Act, or any other federaror local governmental permit.
If you have any questions concerning the final permit or the requirements for your facility, please contact Mike
Templeton at [phone], extension 541, or at [e-mail].
Sincerely,
011,111 4
1
Vr Alan W. Klimek, P.E.
Director
cc: Raleigh Regional Office / Water Quality
NPDES Unit Files
Central Files
Aquatic Toxicology Unit
EPA Region IV
North Carolina Division of Water Quality [phone]
1617 Mail Service Center FAX [phone]

Permit NCO020389
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
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 Water Quality
Commission, and the Federal Water Pollution Control Act, as amended, the
Town of Benson
is hereby authorized to discharge wastewater from a facility located at the
Benson Wastewater Treatment Facility
770 Hannah Creek Road (south of I-95)
Four Oaks
Johnston County
to receiving waters designated as Hannah Creek in the Neuse River Basin in accordance with
the discharge limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III and IV hereof.
This permit shall become effective November 1, 2003.
This permit and authorization to discharge shall expire at midnight on April 30, 2008.
Signed this day September 24, 2003.
r Alan . Klimek, PA, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NCO020389
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 Benson is hereby authorized to:
1. Continue to operate an existing 1.5 MGD wastewater treatment facility located at
the Benson WWTF off Hannah Creek Road in Four Oaks, Johnston County. This
permitted facility includes the following components:
• Bar screen
• Grit removal
• Parshall flume with flow measurement
• Influent screw pumps
• Three extended aeration/oxidation basins
• Four secondary clarifiers
• Tertiary filters
• Chlorine contact basin
• Dechlorination
• Post aeration
• Alum and lime storage/handling units,
• Aerated sludge lagoon
• Two stabilization lagoons (also act as influent flow storage)
• Lagoon effluent return pump station; and
2. Discharge wastewater from said treatment works at the location specified on the
attached map into Hannah Creek, classified C-NSW waters in Neuse River Basin.

Latitude: 35°23'21" Facilit
Longitude: 78°30'29" N C 0 0 2 0 3 8 9 y,, �k,Y i
Quad #: F24NE
Location Gam•
Receiving Scream: Hannah Creek Town of Benson?
Stream Class: C-NSW WWTP
44 Subbas;n:3oao4 We s
caLE rey000

Permit NCO020389
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 1.5 MGD of municipal wastewater from outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
=
EFFLUENT
CHARACTERISTICS -
LIMITS:
MONIT.Q,RING
REQUIREMENTS
,
Monthly
Average,
Weekly
Average
Raily
Maximum
Measuremerit
Frequericy
Sample_ ..
z Type
Sample
Location'
Flow
1.5 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow (MG)
Monitor and Report
Monthly
Recorded or
Calculated
Effluent
BOD, 5 day (202C)2 April 1-October 311
5.0 mg/I
7.5 mg/l
Daily
Composite
Influent & Effluent
BOD, 5 day (209C)2 [November 1-March 31]
10.0 mg/l
15.0 mg/I
Daily
Composite
Influent & Effluent
Total Suspended SolidsZ
30.0 mg/l
45.0 mg/l
Daily
Composite
Influent & Effluent
NH3 as N [April 1-October 3l
2.0 m /l
6.0 mg/I
Daily
Composite
Effluent
NH3 as N [November 1 - March 31]
4.0 m /I
1 12.0 m /I
Daily
Composite
Effluent
Dissolved Oxygen 3
Daily
Grab
Effluent
Dissolved Oxygen
Variable'
Grab
U& D
Fecal Coliform (geometric mean)
2001100 ml
400/100 ml
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
Variable'
Grab
U& D
Total Residual Chlorine
17 µg/L4
Daily
Grab
Effluent
TKN (mg/L)5
Monitor and Report
Weekly
Composite
Effluent
NO2 + NO3 (m /L)5
Monitor and Report
Weekly
Composite
Effluent
Total Nitrogen (m /L)5
Monitor and Report
Weekly
Composite
Effluent
Total Nitrogen Loads
Monitor and Report (pounds/month)
Monthly
Calculated
Effluent
33,790 pounds/year
Annually
Calculated
Effluent
Total Phosphorus'
2.0 mg/L
(Quarterly Average)
Weekly
Composite
Effluent
Temperature 2C
Daily
Grab
Effluent
Temperature (°C)
Variable'
Grab
U& D
Conductivity
Daily
Grab
Effluent
Conductivity
Variable'
Grab
U& D
Chronic Toxlcitys
Quarterly
Composite
Effluent
Total Chromium
50 µ /l
1,022 µ /I
Weekly
Composite
Effluent
Total Nickel
88 µ /l
261 /l
Weekly
Composite
Effluent
Total Mercury
0.012 µ /I
Weekly
Composite
Effluent
Total Copper
2/Month
Composite
Effluent
Total Zinc
2/Month
Composite
Effluent
F'I9
6-9 standard units
Daily
Grab
Effluent
Footnotes:
1. U: Upstream at the culvert on NCSR 1158. D: Downstream at (1) NCSR 1711 and (2) I-95 culvert. Stream samples shall be
grab samples collected 3/Week from June to September and 1 /Week during the remaining months of the year. Instream
monitoring is provisionally waived in light of the Permittee's participation in the Lower Neuse Basin Association.
Instream monitoring shall be conducted as stated in this permit should the Permittee end its participation in the
Association. See condition A. (5.) for additional upstream monitoring requirements that are not waived.
2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective
influent value (85% removal).
3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
4. Total Residual Chlorine limit takes effect May 1, 2005. See condition A. (6).
5. For a given wastewater sample, Total Nitrogen = TKN + NO3-N + NO2-N where TKN is Total Kjeldahl Nitrogen, and NO3-
N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
6. Total Nitrogen Load is the mass quantity of Total Nitrogen discharged in a given period of time. See A. (3). The annual TN
Load limit shall become effective with the calendar year beginning on January 1, 2003. Compliance with this limit shall be
determined in accordance with condition A. (4), Annual Limits for Total Nitrogen.

Permit NCO020389
7. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar
quarter Qanuary-March, April -June, July -September, October -December).
8. Chronic Toxicity (Cviodaphnia dubia) P/F at 90%: January, April, July, and October [see condition A. (2)]. Toxicity monitoring
shall coincide with metals monitoring.
9. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2) CHRONIC TOXICITY PERMIT -LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quaileLly 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 ofJanuary, April, July and October. 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 II 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, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:
NC DENR / DWQ / Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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
alternate monitoring requirements or limits.
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 NCO020389
A. (3) CALCULATION OF TOTAL NITROGEN LOADS
a. The Permittee shall calculate monthly and annual TN Loads as follows:
L Monthly TN Load (pounds/month) = TN x TMF x 8.34
where:
TN = the average Total Nitrogen concentration (mg/L) of the composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the month (MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
H. Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loads for the
calendar year
b. The Permittee shall report monthly Total Nitrogen results (mg/L and
pounds/month) in the discharge monitoring report for that month and shall report
each year's annual results (pounds/year) in the December report for that year.
A. (4) ANNUAL LIMITS FOR TOTAL NITROGEN
a. Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the
Neuse River basin are annual limits and are applied for the calendar year.
b. For any given calendar year, the Permittee shall be in compliance with the annual
TN Load limit in this Permit if:
i. the Permittee's annual TN Load is less than or equal to said limit, or
ii. the Permittee is a Co-Permittee Member of a compliance association.
c. The TN Load limit in this Permit (if any) may be modified as the result of allowable
changes in the Permittee's TN allocation.
i. Allowable changes include those resulting from purchase of TN allocation from
the Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation
between the Permittee and other dischargers; regionalization; and other
transactions approved by the Division.
ii. The Permittee may request a modification of the TN Load limit in this Permit to
reflect allowable changes in its TN allocation. Upon receipt of timely and proper
application, the Division will modify the permit as appropriate and in
accordance with state and federal program requirements.
iii. Changes in TN limits become effective on January 1 of the year following
permit modification. The Division must receive application no later than
August 31 for changes proposed for the following calendar year.
iv. Application shall be sent to:
NCDWQ / NPDES Unit
Attn: Neuse River Basin Coordinator
Mail Service Center
Raleigh, NC 27699-1617
d. If the Permittee is a member and co-Permittee of an approved compliance
association, its TN discharge during that year is governed by that association's
group NPDES permit and the TN limits therein.
i. The Permittee shall be considered a Co-Permittee Member for any given
calendar year in which it is identified as such in Appendix A of the
association's group NPDES permit.

Permit NCO020389
ii. Association roster(s) and members' TN allocations will be updated annually
and in accordance with state and federal program requirements.
iii. If the Permittee intends to join or leave a compliance association, the Division
must be notified of the proposed action in accordance with the procedures
defined in the association's NPDES permit.
(1) Upon receipt of timely and proper notification, the Division will modify the
permit as appropriate and in accordance with state and federal program
requirements.
(2) Membership changes in a compliance association become effective on
January 1 of the year following modification of the association's permit.
The TN monitoring and reporting requirements in this Permit remain in effect until expiration
of this Permit and are not affected by the Permittee's membership in a compliance association.
A. (5) ADDITIONAL UPSTREAM MONITORING REQUIREMENTS
In order to assess the impact of this discharge on the receiving stream, the Permittee is
required to perform year-round upstream monitoring of dissolved oxygen and temperature.
This monitoring will be performed on a weekly basis throughout the year at the upstream
monitoring point: the culvert on NCSR 1158.
A. (6) TOTAL RESIDUAL CHLORINE COMPLIANCE SCHEDULE
The limit for total residual chlorine shall become effective upon completion of the installation
of a disinfection system but no later than May 1, 2005. If a method different than
chlorination/dechlorination is used, the total residual chlorine limit will not be applicable.
A. (7) LAGOON FREEBOARD HEIGHT REQUIREMENT
A minimum of 2 feet of freeboard height must be maintained in the lagoons (currently used
for equalization/sludge holding). A staff gauge must be placed in each lagoon and the height
recorded daily.

Permit NCO020389
A. (8) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached table. The
analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to
determine whether parameters are present in concentrations greater than applicable standards and
criteria. Samples shall represent seasonal variations. Unless otherwise indicated, metals shall be
analyzed as "total recoverable."
Ammonia (as N)
Trans- l,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-tichloroethane
1,2-dichlorobenzene
Cadmium
1,12-tichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable compounds:
Diethyl phthalate
Mercury
P-chloro-m-creso
Dimeth I phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral comoounds.
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-tichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- A MR-PPAl or in a form approved by the
Director within 90 days of sampling. The report shall be submitted to the following address: Division of
Water Quality, Water Quality Section, Central Files, 1617 Mail Service Center, Raleigh, North Carolina
27699-1617.

imap: / /[e-mail]-143/ f...
Subject: benson, fuquay-varina
From: Mike Templeton <[e-mail]>
Date: Fri, 05 Sep 2003 13:50:23 -0400
To: Marshall Hyatt<[e-mail]>
CC: Natalie Sierra <[e-mail]>, Charles Weaver <[e-mail]>
Marshall -
Per our conversation, here's a quick summary of our response to your
comments on the Benson and Fuquay-Varina draft permits.
Regarding Benson, N00020389:
1. Antimony - The receiving stream is a Class C-NSW water; that is,
it's not a designated drinking water source. Given that and the fact
that we have the criterion but no standard for antimony, we do not
propose to add a limit at this time. The Town will monitor annually as
part of its PPA, and we will evaluate the need for a limit or increased
monitoring at permit renewal.
2. Mercury - We no longer need the footnote in the permit, as the Town
has already been notified in writing of the new Hg monitoring protocol.
We will remove the fact sheet's reference to the footnote.
Regarding Fuquay-Varina, NCO066516:
1. Human health standard for arsenic - Agree that we should be
documenting our consideration of human health standards in the fact
sheet, as we do with aquatic life -based standards. In this case, we only
have a single sample to work with, and it's a non -detect. The Town will
monitor annually as part of its PPA, and we will evaluate the need for a
limit or increased monitoring at permit renewal.
2. Penta - Agree that all analyses should be conducted using
"sufficiently sensitive" methods to evaluate RP. Boilerplate already
requires it, but we will consider mentioning it in the PPA condition as
well.
3. 1/2FAVs used in the RPA - Responded in a separate e-mail on 8/28.
I think that covers it. Let me know if I missed anything.
- Mike T
Michael E. Templeton, P.E.
North Carolina Division of Water Quality
NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
919-733-5083 x541 FAX: [phone]
mailto:[e-mail]
141 9/8/2003 7:29 AM

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Wolf Laurel Commercial Park
Latitude:
35' 54' 45" N
State Grid/Quad:
D 8 NE / Sam's Gap, NC
Loneitude:
82' 33' 25" W
Permitted Flow:
0.030 MGD
*Receiving Stream:
Big Laurel Creek
Drainage Basin:
French Broad River
Stream Class:
C, Trout
Sub -Basin:
04-03-04
Q
~ ' Approximate Property
Boundary
Facility
Location
not to scale
North NPDES Permit No. NCO087688
Madison Count

[Fwd: EPA comments on Benson [NCg020389]
s~
Mike - I'll put a hard copy of this in the file, which is in Natalie's office.
CH W
-------- Original. Message --------
Subject: Delivery Status Notification
Date: Fri, 15 Aug 2003 09:56:53 -0400
From: Hyatt. [e-mail]
To: [e-mail]
To:
Subject: comments on NC0020389 - Town of Benson
WWTP
just learned that Natalie has moved to CA. Will she be responding to
these? if not, pls forward to whomever has been assigned. let me
r
know. thanks Marshall
a
----- Forwarded by Marshall Hyatt/R4/USEPA/US on 08/15/2003 09:54 AM
Marshall Hyatt
To:
natalie.sierragncmail-net
08/13/2003 01:42 cc: Madolyn
Dominy/R4/USEPA/US@EPA
PM Subject: comments on
NC0020389 - Town of Benson W1,1TP
sorry for the delay in getting these to you. I was on vacation and now
Madolyn is. Will you be able to respond by
Aug 19 so we have time to send any formal letters if needed? thanks
Marshall
1. re antimony. The application reports a single value of 17 ug/l.
_ k1•
Neither NC nor EPA has aquatic life criteria for antimony. However,�A�
RR
EPA's human health criterion for the protection of consumption of`�6
contaminated fish and water is 14 ug/l at the 10-6 risk level. Is there
Dq1r
�
a need for an antimony limit or monitoring in this permit? I recall a
C
similar issue coming up on some other permit, but can't remember enough
to know how we resolved it.
\O,,sS
2. The fact sheet indicates that the permit will include a footnote to
require Hg testing by Method 1631. The transmittal letter does indicate
that this is a requirement, but there is no footnote in the permit.
Don't you need to add it?
1 of 2
08/20/2003 10:21 AM

MEMORANDUM
To: Natalie Sierra
From: Kirk Stafford-RRO
Through: Randy Jones-RRO.
Date: August 19, 2003
Subject: Draft NPDES Permit NCO020389
Town of Benson WWTP
Johnston County
I have reviewed the subject draft permit with the following comments. The changes to the
current draft permit are detailed in the cover letter. The RRO supports those changes. The
draft permit indicates discharge coordinates as 35.23.22 and 78.30.03. The coordinates
should read 35.23.21 and 78.30.29. I conducted a Compliance Evaluation/Biomonitoring
Inspection at the subject facility the week of July 29, 2003. The facility passed that
chronic bioassay. I noticed no problems at the facility during those inspections. The
facility ORC has received the draft permit and is reviewing the document. The ORC did
indicate that the upstream location specified in the draft was a wet weather ditch in a field
which may be dry at times. The facility discharge is specified as Hannah Creek but it
should be noted that Hannah Creek at the discharge point is in real}y a swamp which will
exhibit low dissolved oxygen levels at certain times of the year. The ORC is evaluating
dechlorination technologies due to the new residual chlorine limit in the draft permit. Mr.
Keith Langdon, Town manager, indicated in a phone conversation on August 19, 2003
that an old existing dechlorination building would be fitted with new equipment to meet
the residual chlorine limit. The old equipment is nonfunctional. The town is working on
this currently. The ORC was advised of the Division's web site address for ATC and
dechlorination guidance for ATC.

�a OF BEtis
A`o % 1 \ 'OZ TOWN MANAGER
MAYOR v /Y KEITH R. LANGDON
DON H. JOHNSON
�Q TOWN CLERK
COMMISSIONER y0 " CONNIE M. SORRELL
FREDRICK D. NELSON, JR. NTH CARO�
J.W. PARRISH, JR. FINANCE OFFICER
JACK R. LITTLETON TOWN OF BENSON DONNA M. HONEYCUTT
KENNITH M. DUPREE TAX COLLECTOR
LINDELL NORDAN P.O. BOX 69
303 EAST CHURCH STREET ROSALE G. WEST
RAY G. SMITH NORTH CAROLINA
TOWN ATTORNEY
27504
[phone] DONALD A. PARKER
August 14, 2003 FAX [phone]
Ms. Natalie Sierra
NCDENR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: Draft NPDES Permit
Permit NCO020389
Town of Benson, Johnston County
Dear Ms. Sierra:
This letter is concerning questions and comments the Town of Benson has on the draft permit dated July 16,
2003.
Item 1: Weekly upstream monitoring of dissolved oxygen and temperature at the NCSR 1211 monitoring
point a. (5). The Town of Benson would like to submit for you consideration that our upstream monitoring
point beat the culvert on NCSR 1158. This point we think will better serve to assess the impact of our plant
discharge on the stream and also it will give two points of data if the coalition's monitoring point is still at
NCSR 1211.
By relocating the town's monitoring point to NCSR 1158 removes all agriculture commercial, and residential
influence between this monitoring point and the plant outfall, hopefully giving the town and your office a more
accurate assessment of the impact of our plants discharge on the receiving stream's, (Hannah Creek) dissolved
Oxygen.
Item 2: A. (8) Effluent flow monitoring was omitted from the draft permit.
Item 3: Also find included a copy of a letter from Southern Testing dated July 28, 2003 stating that a
calculation error was the reason for the detection of 2, 4 dinitrophenol in the PPA.
If you have further questions or concerns please contact me at [phone].
Sincerely,
Martin Morris
Su rinten a EDOZ 5 I env
I
ac ments (3 L
CERTIFIED MAIL 70012510 0007 3464 6387 l 5 i V G
l \ic Documents Old does TOkN'\ FILFS %%-%%tp Sierra \PDFS Draft permit \CO020389- 8-2003.doc

vtj Y S F'Q
_ aP Southern Testing & Research Laboratories
7 4V 3809 Airport Drive NW, Wilson, NC 27896-8649 • 252-237-4175 • FAX: [phone]
.q l`o www.SouthernTesting.com
FA I fi
July 28, 2003
To: Marty Morris
Town of Benson
From: Jeremy Brown
Environmental Department Manager
Re: Annual Pollutant Analysis Monitoring Form (August 2002) ,
After reviewing the data associated with your sample collected 8-14-02 (STRL sample
M0442-001) it was determined that the result of 20 ug/L for 2,4-Dinitrophenol was
reported incorrectly due to a calculation error. An amendment has been made to page 4 of
the APAM report and is enclosed with this letter. Copies of this letter and the amended
report are being forwarded to Natalie Sierra at the North Carolina NPDES Units.
We apologize for any inconvenience. If you have further questions or concerns please call
me at [phone] ext. 238.
Je �y BTal
Emepartment Manager
Chemical and Microbiological Analyses: Environmental • Agrochemical - Foods • Pharmaceuticals
Another Company

B. Acid Extractable Fraction, EPA Method 625 STRL Sample M0442-001 Page 4 of 9
Number of chemicals detected in Fraction 1
Fraction STORET Number 45582
STORET
Number
Compound
Quantitation
Quantitation
^ Concentration I GC/MS
Limit Target
Limit*
Detected Confirmation?
1. Pollutants to analyzed for:
(Ng/L)
(ug/L)
(,ug/L) Yes No
34452
4-Chloro-3-methylphenol
10
<10
34586
2-Chlorophenol
10
<10
34601
2,4-Dichlorophenol
10
<10
34606
2,4-Dimethylphenol
10
<10
34616
2,4-Dinitrophenol
50
20
<20 **
34657 ^
2-Methyl-4,6-dinitrophenol
50
— 10
<10
34591 -- -
2-N4trophenol --
10 ------
<10 - ---- ---
34646
4-Nitrophenol
50
10
T<10
- -
39032 --
-
Pentachloro---phenol -
-- -
50-
- - -
-- 10
-- -
<10
-
34694
Phenol --' --
10 --
-------
-- -- -
----<10
34621
2,4,6-Tri6h1orophenol
10
<10
* If different from quantitation limit target
II ** Report amended 7-28-03. Result reported incorrectly on initial report due to laboratory calculation error.

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V��
AFFIDAVIT OF PUBLICATI
NORTH CAROLINA.
Wake County. ) Ss.
PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT
COMMISSIOWNPDES 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 143.21. Public law 92-500 and other lawful
standards and regulations, the North Carolina Environ
Mental Management Commission proposes to issue a Nation-
al Pollutant Discharge Elimination System (NPDES)
wastewater discharge Permit tothe 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 proposes 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 casts of
reproduction. Mail comments and/or requests for informa-
tion to the NC Division of Water Quality at the above address
or call Ms. Volery Stephens at (919) 733-50113, extension 520.
Please include the NPDES Permit number (attached) in any
communication. Interested persons may also visit The Divi-
sion of Water Quality at 512 N. Salisbury Street, Raleigh, NC
27604-1148 between the hours of 8:00 a.m. and 5:00 P.mto
review information on file.
Johnston County has applied for renewal of the NPDES
Permit NCO084735 for the County WTP. This permitted
facility discharges filter -backwash wastewater to an un-
named tributary to the Neuse River in the Neuse River Basin.
Currently total residual chlorine is water quality limited.
This discharge may affect future allocations in this portion of
the Neuse River.
The Town of Smithfield has applied for renewal of NPDES
permit NCO083348 for its WTP. This permitted facility dis-
charges filter -backwash wastewater to Buffalo Creek in the
Neuse River Basin. Currently total residual chlorine is water
quality limited. This discharge may affect future allocations
in this portion of Buffalo Creek.
The Town of Benson (NPDES Permit NC0020389) has applied
for renewal of its permit discharging to Hannah Creek in the
Neu se River Basin, Currently, BOD, ammonia nitrogen, total
nitrogen, total phosphorus, chromium, nickel and mercury
are water quality limited. This discharge may impact future
allocations in the receiving stream.
July 18, 2003 _
IEC IEdWE
JUL 232003
DENR-WATER QUALITY
POINT SOURCE BRANCH
Before the undersigned, a Notary Public of Johnston
County North Carolina, duly commissioned and authorized to
administer oaths, affirmations, etc., personally appeared Ivy
Marsch, who, being duly sworn or affirmed, according to law,
doth depose and say that she is Billing Manager -Legal
Advertising of The Smithfield Herald a corporation organized
and doing business under the Laws of the State of North
Carolina, and publishing a newspaper known as The
Smithfield Herald, in the City of Smithfield, Johnston County
and State aforesaid, 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
meeting 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, and that as such she
makes this affidavit; that she is familiar with the books, files
and business of said corporation and by reference to the files
of said publication the attached advertisement for NC
DIVISION OF WATER QUALITY was inserted in the
aforesaid newspaper on dates as follows: 07/18/03
Account Number: 73350831
The above is correctly copied from the books and files of the aforesaid Corporation and publication.
SEAL
4ffillingger-Legal Advertising
Sworn or affirmed to, and subscribed before me, this
21 day of JULY , 2003 AD
In Testimony Whereof, I have hereunto set my hand
and affixed my official seal, the day and year aforesaid.
(/...... ...
� Notary Public
My commission expires 2nd day of July, 2005.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO020389
Facility Information
Applicant/Facility Name:
Town of Benson/Benson WWTP
Applicant Address:
P.O. Box 69, Benson, North Carolina 27501
Facility Address:
770 Hannah Creek Road; Four Oaks, North Carolina 27524
Permitted Flow
1.5 MGD
Type of Waste:
domestic (70%) and industrial (30%) with pretreatmentprogram;
Facility/Permit Status:
Class IV /Active; Renewal
County:
Johnston County
Miscellaneous
Receiving Stream:
Hannah Creek
Regional Office:
Raleigh
Stream Classification:
C-NSW
State Grid /USGS Quad:
F24NE/Benson, NC
303(d) Listed?
no
Permit Writer:
Natalie V. Sierra
Subbasin:
03-04-04
Date:
June 27, 2003
Drainage Area (mi2):
10.5
°s
�)
"
`
Lat. 350 23' 22" N Long. 78° 30' 03" W
Summer 7Q10 (cfs)
0.0
Winter. 7Q10 (cfs):
0.0
30Q2 (cfs)
0.075
Average Flow (cfs):
12.0
IWC (%):
100%
BACKGROUND
The Town of Benson's WWTP is a 1.5 MGD plant serving 2,955 customers in the Town of
Benson as well as one Significant Industrial User (SIU). The Permittee will continue to
implement its approved pretreatment program as required by the Division. Average flow over
the last two and a half years has been 1.08 MGD (72% of the permitted flow), about 200,000
gallons per day of which can be attributed to inflow and infiltration (I/I). The Town is
undergoing sewer rehabilitation efforts to reduce this contribution.
At the previous permit renewal, this facility was one of a group that the Neuse River Foundation
brought to public hearing. At the time, the facility was having problems with pretreatment and
needed to make more firm financial commitments to keep up with sewer and wastewater
treatment needs as the population increases. This facility was not selected for a public hearing in
this round of permitting.
Benson applied for renewal of the NPDES permit on November 1, 2002 by submitting EPA
Form 2A to the Division. In addition to NPDES permit NC0020389, Benson also holds non -
discharge permit WQ0012514 for class B sludge.
Instream Monitoring and Verification of Existing Conditions and DMR Data Review
This facility discharges to Hannah Creels, classified C-NSW in subbasin 03-04-04 of the Neuse
River Basin. Although Hannah Creels is not itself listed on the 303(d) list, the Neuse River
estuary to which it drains is on the 303(d) list for chlorophyll -a. As a result, the upstream waters
of the Neuse River estuary have been given the nutrient sensitive (NSW) additional classification
and the Town of Benson must adhere to the nutrient limitations set out by basin plans and the
Nitrogen TMDL.
Instream monitoring is performed through the Lower Neuse Basin Association (LNBA). The
LNBA has a monitoring station at Hannah Creek about 2.7 miles downstream of the Benson
WWTP outfall. This station, J5400000, is Hannah Creek at I-95 near Benson. The data for
J5400000 are attached to this fact sheet. Data for temperature seem seasonally appropriate.
Fact Sheet
NPDES NCO020389 Renewal
Paac i

Total phosphorus, total nitrogen, nitrate and nitrate, ammonia nitrogen, TSS and turbidity seem
appropriate and typical for this river basin. There was one excursion from the standard for fecal
coliform (2000 cfu/100 mL in August of 2002), but these data were otherwise below 200 cfu/100
mL. The only potential parameter of concern is dissolved oxygen. Although effluent dissolved
oxygen was consistently above 7.0 mg/L, downstream dissolved oxygen was below 5.0 mg/L
(the standard for this waterbody classification) for nearly half the samples. This occurred
primarily in the summer samples. Since there are no upstream data, it is impossible to determine
whether or not the discharge is the cause of the depleted instream dissolved oxygen levels.
Moreover, this area is somewhat swamp -like although it is not classified as such — this may be at
least part of the reason for the low dissolved oxygen levels. A special condition will be added
for the .monitoring of upstream dissolved oxygen to allow for further study of the stream.
Effluent data were reviewed from January 2001 — April 2003. The table below gives the
average, maximum and minimum values for conventional and oxygen -consuming waste
parameters.
As can be, seen. in the table above, while fecal coliform levels are extremely and consistently low,
this comes at the price of very high total residual chlorine (TRC) levels. The average value, 340
µg/L is in excess of the current water quality standard of 17 µg/L. The Town will need to install
dechlorination facilities in order to meet this new standard.
The Benson WWTP also collects data for ammonia nitrogen, total nitrogen and phosphorus. The
values for these are summarized in the table below.
Correspondence
The NPDES permit for this facility was issued on October 9, 2000. The requirements of this
permit are described in the Wasteload Allocation section. Since permit issuance, the Town of
Benson has received seven notices of violation (NOVs), three of which had civil penalties
associated with them. One NOV was for shortcomings during a Pretreatment Compliance
Inspection (no STMP monitoring, no headworks analysis and improper recordkeeping) and one
was for an unauthorized discharge to the waters of the state (manhole overflow). Two NOVs
(and one of the civil penalties) were related to toxicity — one failure and one failure to submit
toxicity results. The other NOVs were for violations of the weekly average BOD limit and the
monthly average ammonia nitrogen limit. The latter had a civil penalty associated with it.
The Raleigh Regional Office (RRO) has performed a Pretreatment Compliance Inspection and a
Collection System Inspection during this permit term. The latter emphasized Benson's problems
with I/I as well as the need to perform better recordkeeping and include signage on pump
stations. The RRO also prepared a staff report for this renewal for which a site visit was
conducted. An update process flow was provided in this report as well as the following
recommendations: maintenance of the minimum 2 foot freeboard requirement for the 2
Fact Sleet
F><t-„> '

equalization/sludge lagoons, inclusion of a chlorine limit in this permit, change the ammonia
limits to 1 mg/L (summer) and 2 mg/L (winter) to maintain consistency with Division policy,
and elimination of the effluent conductivity requirement.
PERMITTING STRATEGY
Waste Load Allocation (WLA)
The Division prepared the last WLA in conjunction with the previous permit renewal. Limited
parameters were: flow, BOD, TSR, ammonia nitrogen, dissolved oxygen, fecal coliform, total
nitrogen, total phosphorus, pH and toxicity. Monitored parameters were total residual chlorine
(TRC), temperature, conductivity, copper, zinc and antimony. The previous and current effluent
limits were based on guidelines and water quality standards. The Division has judged previous
parameters and limits to be appropriate for renewal with some exceptions (see Reasonable
Potential Analysis and Priority Pollutant Analysis). In conjunction with an EPA mandated
policy change, weekly average limits of 3 mg/L and 6 mg/L will be implemented. The monthly
average limits will not be changed to 1 mg/L (summer) and 2 mg/L (winter) until expansion or
unless it can be proven that downstream dissolved oxygen levels are directly attributable to the
Benson discharge. This is in accordance with Division policy. In addition, in order that the
Permittee may collect sufficient data to meet the requirements of the new EPA Form 2A, an
annual pollutant scan will be added to this permit.
The requirements related to the Neuse River TMDL will also be updated and are described
further below.
Reasonable Potential Analysis (RPA)
The Division conducted EPA -recommended analyses to determine the reasonable potential for
toxicants to be discharged by this facility, based on DMR data (January 2001-April 2003) and
SMTP collected as part of the pretreatment program. Calculations included parameters listed in
the previous permit and pre-treatment documents to include: arsenic, cadmium, chromium,
cyanide, lead, mercury, nickel, silver, selenium, copper and zinc.
Results suggest no reasonable potential for the facility to discharge arsenic, cadmium, cyanide,
lead, silver and selenium. With the exception of silver, all of these parameters are. monitored
through the pretreatment program. Silver monitoring will be dropped from the NPDES permit
but will continue to be monitored through the STMP.
The RPA indicates that the following parameters demonstrate reasonable potential: chromium,
copper, mercury, nickel and zinc. Chromium, mercury and nickel will be added to the permit
with limits and a weekly monitoring frequency. Copper and zinc have state action levels and
therefore will continue to be monitored at a frequency of 2/month unless significant toxicity.
Priority Pollutant Analysis -
Antimony, copper, zinc, cyanide and 2,4 dinitrophenol were all detected in the priority pollutant
analysis. No water quality criteria exist for antimony in class C waters and it was not detected at
a significant enough level to warrant additional monitoring. The Permittee will be asked to
explain the presence of the 2, 4 dinitrophenol — monitoring of this parameter may be .added
depending on the response. Copper, zinc and cyanide are already monitored by the Permittee;
the results are described above.
Neuse River TMDL
Nitrogen
The Environmental Management Commission adopted Nutrient Management Strategy rules in
December 1997, .classifying the entire Neuse River Basin as Nutrient Sensitive Waters. The point
source rule (T15A NCAC 2B .0234) sets Total Nitrogen (TN) discharge limits for all point
source dischargers larger than 0.5 MGD.
Fact Sheet
NPDES.NC'0020389 Renewal
Pa<.tc

The rule also allows dischargers to form a group compliance association and work together to
reduce nitrogen; this option allows the association members added flexibility in controlling
nitrogen discharges. At the same time, the association is subject to a group NPDES permit
ensuring that the association and its individual members are accountable if they exceed the
applicable nitrogen limits.
Under the rule, there are three types of TN limit in the Neuse:
1. the individual limits in the dischargers' individual permits,
2. the aggregate limit in an association's group NPDES permit, and
3. the individual allocations/limits for each Association member, also in that association
permit.
A discharger may be subject to the first type of limit, or to the second and third, but never to all
three at the same time. The discharger is first subject to the TN limit (if any) in its individual
NPDES permit. If becomes a co-Permittee to a compliance association's group NPDES permit, it
is then governed by the TN limits in that permit. If the association complies with its group TN
limit in a given year, all members are deemed to be in compliance with their individual
allocations/ limits in the group permit. If the association exceeds its limit, the members then
become subject to their individual allocations/ limits as well.
Regardless of which permit governs a TN discharge, allocations/ limits will likely change over
time as the dischargers purchase, sell, trade, lease, or otherwise transfer nitrogen allocations. The
Division will modify the affected permits as necessary to ensure that the limits are kept up to date
and reflect any such transactions.
The permit includes nutrient limits consistent with the Nutrient Management Strategy rule (T15A
NCAC 2B .0234). Under the new rule, the Town receives a TN Load limit of 33, 790 lb./yr., a
calendar year limit. In addition, the Town is a member of the Neuse River Compliance
Association at this time. So long as it remains a co-Permittee member, it is deemed to be in
compliance with the TN limit in this permit, and its TN discharge is governed instead by the
Association's group NPDES permit, issued December 30, 2002.
Phosphorus
The Town's 2.0 mg/L Total Phosphorus limit is carried forward in the new permit.
SUMMARY OF PROPOSED CHANGES
In keeping with Division policies and the member rules of the Tar -Pamlico Nutrient -Sensitive
Waters Implementation Strategy, Phase II, the following will be incorporated into the permit:
• Acute and chronic limits for chromium and nickel; weekly monitoring
• Limit and weekly monitoring for mercury; include the 1631 monitoring
language in the footnote
• Maintain 2/month monitoring for copper and zinc
• Drop silver monitoring (to be continued in STMP)
• Add annual pollutant scan
• Weekly average ammonia limits of 6.0 mg/L and 12.0 mg/L
• Update Neuse permit language and special conditions
• Request an explanation in cover letter for presence of 2,4 dinitrophenol in
priority pollutant scan
Fact Slzcet
ilzwe 4

Total residual chlorine daily maximum limit of 17 µg/L with an 18 month
compliance schedule
Add special condition requiring upstream dissolved oxygen and temperature
monitoring on a weekly basis.
New Weekly Average and Daily Maximum limits are derived from the latest NC/EPA policies
considering'/2 FAVs and allowable concentrations based on reasonable potential.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
July 16, 2003
August 29, 2003
Attachments: DMR data, instream data plots, RPA summary, aquatic toxicity summary
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Natalie Sierra at 919 733-5083 ext. 551.
U/
NAME:DATE: �b (�3
REGIONAL OFFICE COMMENTS
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
`vNA"S NC0020389 Renovai
NLa 'e 5

NCO020389 - Town of Benson
Date
Flow
(MGD)
Temperature
(deg C)
Conductivity
(umhos)
DO
(mg/L)
BOD
(mg/L)
TSS
(mg/L)
Fecal Coli.
(#/100 ml-)
TRC
(mg/L)
NH3-N
(mg/L)
TN
(mg/L)
TP
(mg/L)
Jan-01
0.899
9.85
248.6
11.11
3.61
2.9
1.9
0.35
0.52
2.99
1.25
Feb-01
0.894
11.54
342.4
10.68
2.85
3.5
2.1
0.37
0.58
3.32
0.89
Mar-01
1.249
11.49
278.0
10.21
1.56
3.6
3.5
0.37
0.61
3.22
0.74
Apr-01
0.934
15.07
291.5
9.79
3.28
3.2
1.3
0.38
0.44
4.80
0.88
May-01
0.803
20.08
323.6
9:18
2.18
3.8
2.0
0.37
0.54
8.08
1.03
Jun-01
1.339
23.66
342.7
9.35
2.51
3.3
2.3
0.37
0.61
2.61
1.24
Jul-01
1.162
25.77
235.6
9.12
1.87
3.0
2.1
0.37
0.56
6.14
1.25
Aug-01
1.834
24.75
225.8
8.34
1.63
3.2
2.4
0.36
0.56
6.35
0.99
Sep-01
1.086
23.58
286.8
9.57
3.75
5.6
3.0
0.35
0.67
5.76
1.01
Oct-01
0.9.76
22.22
338.2
9.09
2.06
3.6
4.9
0.35
0.48
3.97
1.07
Nov-01
0.760
20.78
374.8
9.17
2.66
3.5
6.5
0.35
0.97
6.51
1.86
Dec-01
0.903
19.89
392.6
9.09
3.68
4..2
2.7
0.36
0.66
8.27
1.12
Jan-02
1.321
10.14
370.0
8.86
4.55
4:7
4.3
0.33
1.42
6.82
0.93
Feb-02
1.335
17.00
312.0
9.40
3.58.:
4.6
3.3
0.32
0.47
4.78
0.85
Mar-02
1.164
18.07
298.7
9.00
4.79,
3.1
5.7
0.31
0.81.
11.28
0.93
Apr-02
1.111
19.75
312.2
8.54
4.70
It
4.7
0.33
1.01
6.60
1.00
May-02
0.936
20.75
325.9
8.41
'3.48
2.4
7:0
0.32
0.39
6.71
0.93
Jun-02
1.023
26.09
.382.6
.8.20
2.17
2.1-
10.8
0.30
0.28
7.67
0.99
Jul-02
1.031
26.78
410.0
7.81
1.25
'2.5
22.1
0.25
0.23
7.59
0.04
Aug-02
1.050
26.14
467.2
8.42
2.00
3.6
5.3
0.31
0.36
12.40-
1.08
Sep-02
1.148
25.43
371.7
8.09
2.72
4.9
`9 9
0.29
0.88
9.32
1 W
Oct-02
0.903
22.80
384.4
8.15
4.01
6.4
17.1
0.33
2.42
11.71
1.07
Nov-02
1.087
19.48
326.1.
8.58
3.63
3.8
-5.5
0.36
0.98
3.49
1.25
Dec-02
0.965
15.22
288.4
8.65
4.33
4.4
6.3
0.32
0.30
6.76
0.94
Jan-03
0.854
14.78
298.1
8.404.42
.1 6.0
3.9
0.36
0.51
5.69
0.95
Feb-03
1.011
15.13
288.6
7.86
- 4.73
7.5
6.2
0.37
0.38
5.48
1.05
Mar-03
1.344
16.73
305.0
7.95
3.63
6.0
4.3
0.34
0.45
5.15
1.09
Apr-03
1.073
17.20
300.6
7.94
2.89
6.9
5.7
0.35
0.86
6.46
0.94
Average
1.078
19.61
325.8
8.89
3.16
4.1.
5.6
0.34
0.66
6.43
1.00
Maximum
1.834
26.78
467.2
11.11
4.79
7.5
22.1
0.38
2.42
12.40
1.36
Minimum
0.760
9.85
225.8
7.81
1.25
2.1
1.3
0.25
0.23
-2.61
0.04

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J5400000
11 /07/2000
13.3
4.3
6.1
174
4.5
6.5
23
0.05 <
0.1 <
1.9
1.9
0.11
J5400000
12/12/2000
9.8
6.4
6.7
144
1.9
2.5
14
0.02
0.12
0.4
0.52
0.03
J5400000
01/24/2001
4.9
8.5
6.6
118
3.2
1 <
7
0.34
0.11
0.5
0.61
0.04
J5400000
02/22/2001
7.2
6.7
6.5
121
4.2
2
40
0.05
0.18
0.6
0.78
0.08
J5400000
03/27/2001
11.0
10.6
7.0
100
3.3
1.5
20
0.03
0.22
0.4
0.62
0.04
J5400000
04/13/2001
23.0
5.1
6.6
122
6.3
5
88
0.13
0.03
1.1
1.13
0.2
J5400000
05/02/2001
20.4
7.7
6.5
122
3.8
3.3
140
0.06
0.01 <
1.3
1.3
0.1
J5400000
05/17/2001
16.7
4.5
6.2
146
J5400000
06/07/2001
25.5
3.9
6.5
108
10
5.7
88
0.06
0.01 <
0.9
0.9
0.08
J5400000
06/20/2001
24.0
2.0
6.1
82
J5400000
07/05/2001
25.1
2.5
6.0
107
17
6
68
0.06
0.01 <
0.8
0.8
0.19
J5400000
07/13/2001
24.3
2.0
6.4
85
J5400000
08/07/2001
26.2
1.3
6.9
109
12
5.5
4
0.03
0.01 <
0.9
0.14
J5400000
08/21/2001
24.1
0.8
6.3
102
J5400000
09/06/2001
23.7
1.7
6.3
106
17
11.8
47
0.02
0.01 <
0.7
0.7
0.03
J5400000
09/21/2001
23.4
2.6
6.3-
133
J5400000
10/08/2001
15.1
3.8
6.3
108
2.2
1.5
128
0:01 <
0.01 <
0.2
0.2
0.05
J5400000
11 /12/2001
12.5
3.3
6.7
213
6.3
5.5
200 <
0.04
0.01 <
0.4
0.4
0.07
J5400000
12/04/2001
13.3
1.7
6.7
302 -
12
16.5
46
0.27
0.01 <
1.2
1.2
0.52
J5400000
01 /09/2002
4.3
7.9
6.8
152
4.3
2.7
46
0.25
0.34
0.8
1.14
0.06
J5400000
02/12/2002
8.5
7.2
6.9
96
1.9
1.3
27
0.05
0.07
0.5
0.57
0.04
J5400000
03/19/2002
14.3
5.8
6.2
117
5.6
2
52
0.11
0.11
0.7
0.81
0.12
J5400000
04/16/2002
23.7
5.6
6.3
101
2.6
3.7
7
0.02
0.11
0.8
0.9
0.11
J5400000
05/10/2002
27.6
5.7
6.0
148
6.6
4
23
0.25
0.01
1.1
1.11
0.15
J5400000
05/23/2002
21.2
5.3
6.6
161
J5400000
06/06/2002
27.3
7.9
6.5
194
14
13.5
22
0.02
0.01
1.3
1.31
0.02
J5400000
06/21/2002
25.6
6.0
7.0
213
J5400000
07/09/2002
29.1
3.7
6.4
278
29
19
100
0.04
0.02
1.3
1.32
0.21
J5400000
07/16/2002
27.8
2.8
6.3
304
J5400000
08/09/2002
26.7
3.63
6.58
270
50
20.5
2000
0.29
0.01
1.6
0.18
J5400000
08/23/2002
31.6
4.99
6.71
326
J5400000
09/11/2002
25.2
0.5
5.9
239
32
34
520
0.08
0.02
1.4
0.02
J5400000
09/23/2002
24.5
0.9
6.2
186
J5400000
10/04/2002
26
1
6.5
187
14
9.5
90
0.07
0.01 U
1.0
0.42
J5400000
11/22/2002
12
4.5
6.0
117
1.0
1.2
80
0.03
0.10
0.3
0.05
J5400000
12/16/2002
9
9.3
5.6
98
2.7
2.0 U
44
0.01 U
0.2
0.4
0.03
Average
19.7
4.5
6.4
158.0
10.3
7.2
150.9
0.1
0.1
0.9
0.9
0.1
Max
31.6
10.6
7.0
326.0
50.0
34.0
2000.0
0.3
0.3
1.9
1.9
0.5
Min
4.3
0.5
5.6
82.2
1.0
1.0
4.0
0.0
0.0
0.2
0.2
0.0
m
G

12.0
10.0
8.0
C 4.0
2.0
Dissolved Oxygen (NC0020389)
E
o
0
o
o
0 0El p El®® p
♦
♦ ♦
♦
0.0
06/23/200 10/01 /200 01 /09/200 04/19/200 07/28/200 11 /05/200 02/13/200 05/24/200 09/01 /200 12/10/200 03/20/200 06/28/200
0 0 1 1 1 1 2 . 11 2 2 2 3 3
Date
♦ Downstream
13 Effluent

500
450
400
350
N
t 300
E
M
a
250
:r
C 200
U
150
100
50
Conductivity (NC0020339)
E3
M 13 ® p
r 13 p
M E ♦ M
0 0 M El
0
♦
0
06/23/2000 10/01/2000 01/09/2001 04/19/2001 07/28/2001 11/05/2001 02/13%2002' 05%24/2002 09/01/2002 12/10/2002 03/20/2003 06/28/2003
Date
► Downstream
3 Effluent

Facility Name =
Town of Benson W WTP
Qw (MGD) =
1.5
WWTP Classification
4
NPDES ## =
NCO020389
Receiving Stream
Hannah Creek
IWC (%) =
100.00
Reasonable Potential Summary
Final Results
I° 2° 3° 4°
Stream Classification mC NSW -u
7QIOs (cfs)= 0
30Q2 (cfs) 0.075
Qavg (cfs) 12
Arsenic
(Implementation
Max. Pred Cw
25.3 µg/I
i Are all reported values less than?
Yes
Limit?
No
i Monitoring
Allowable Cw
50.0 µg/l
Is the detection limit acceptable?
Yes
Monitor?
No
Frequency None
Cadmium
Implementation
Max. Pred Cw
23.7 µg/l
Are all reported values less than?
Yes
Limit?
No
I Monitoring
Allowable Cw
2.0 µ ll
'Is the detection limit acceptable?
Yes;
Monitor?
No
i Frequency None
1/2 FAV (non Trout)
15.01 AgIl
,
1/2 FAV (Trout)l
2.11 µgll
Chromium
I Implementation
Max. Pred Cw
205.8 µg/1
iAre all reported values less than?
No
Limit?
Yes
Monitoring
Allowable Cw
50.0 µg/1
,Is the detection limit acceptable?
Yes
Monitor?
Yes
Frequency Weekly
1/2 FAVI
1022 µg/1
Copper •:;:..
jImpeementation
Max. Pred Cw
81.7 µg/1
iAre all reported values less than?
No
Limit?
?itt ,
Monitoring
!Frequency
Allowable Cw
7.0 µ /I
, Is the detection limit acceptable?
Yes
Monitor?
Yes
2/Month
1/2 FAVI
7.3 1 µg/1
7
1
Cyanide
jmmpeementation
Max. Pred Cw
2.5 µgA
iAre all reported values less than?
Yes
Limit?
No
Monitoring
Allowable Cw
5.0 µ /1
, Is the detection limit acceptable?
Yes
Monitor?
No
, Frequency None
1/2 FAVI
22.0 µg/1
Lead
jImplementation
Max. Pred Cw
23.3 µg/1
i Are all reported values less than?
No
Limit?
No
i Monitoring
Allowable Cw
25.0 µ /1
,Is the detection limit acceptable?
Yes
Monitor?
No
Frequency None
1/2 Fav
33.8 µg/1
Mercu4
j Implementation
Max. Pred Cw
0.5893 µg/1
iAre all reported values less than?
No
Limit?
Yes
i Monitoring
Allowable Cw
0.0120 µgll
Is the detection limit acceptable'?
Yes
Monitor?
Yes
Frequency Weekly
Nickel
Implementation
Max. Pred Cw
369.1 µgA
iAre all reported values less than?
No
Limit?
Yes
(Monitoring
Allowable Cw
88.0 µ /1
'Is the detection limit acceptable?
Yes
Monitor?
Yes
i Frequency Weekly
1/2 FAVI
261.0 µg/l
Silver
Implementation
Max. Pred Cw
22.5 µg/I
Are all reported values less than?
Yes
Limit?
Nti i
IMonitoring
Allowable Cw
0.1 µg/l
'Is the detection limit acceptable?
Yes
Monitor?
No
iFrequency None
1/2 FAV
Selenium
lImplementation
Max. Pred Cw
Not a POC µgll
iAre all reported values less than?
Yes
Limit?
No
iMonitoring
Allowable Cw
5.0 µg/l
'Is the detection limit acceptable?
Yes
Monitor?
No
;Frequency None
Zincc :::::
::::::::
,Implementation
Max . Pred Cw
1563.7 µg/l
Are all reported values less than?
No
Limit?
No
I Monitoring
Allowable Cw
50.0 µ A
Is the detection limit acceptable?
Yes
Monitor?
Yes
i Frequency 2/Month
1/2 FAVI
67:0 µg/1
'

Whole Effluent Toxicity Testing Self -Monitoring Summary
.tune 17, 2003
FACILITY REQUIREMENT
YEAR JAN
FEB
MAR APR MAY JUN
JUL AUG SEP
OCT NOV DEC
Beaufort WWTP 24hr p/f ac lim: 90%fthd
1999 —
Pass
— — Pass —
— Pass —
— Pass —
NCO021831/001 Begin:8/l/1996 Frequency + Feb May Aug Nov NonComp Single
2000 —
Pass
— — NR/Pass —
— Pass —
— Pass —
County: Carteret Region: WIRO Subbasin: WOKO
2001 —
Fail
Pass — Pass —
— Pass —
— Pass —
PF: 1.5 Special
2002 —
Pass
— — Pass —
— Pass —
— >100.Pass —
7Q10: Tidal IWC(%/ NA
2003 —
Pass
— —
Beech Mountain/Pond Creek chr lim: 5 1 %
1999 Fail
NR Pass
Fail
Pass
— Pass
— —
Pass
— —
NCO069761/001 Begin:6/1/1998 Frequency Q P/F + Jan Apr Jul Oct
+ NonComp Single
2000 Pass
— —
Pass
—
— Pass
— —
Pass
— —
County: Watauga Region: WSRO Subbasin: WAT01
2001 Pass
— —
Fail,18.4sig
>90
— Pass
— —
Pass
— —
PF: 0.4 Special
20p2 Fait
18.4 59.8
18.4
>90
>90 Pass
— —
Pass
— —
7Q10:0.06 IWC(%;51
2003 Pass
— —
Pass
Belhaven WTP 24hr p/f ac monit: 90% Mysid (Grab)
1999 —
— —
—
—
— —
— —
—
-- --
NCO086584/001 Begin:12/1/1999 FrequencyQ Jan Apr Jul Oct
+ NonComp
2000 N
— —
N
—
— N
— —
N
— --
County: Beaufort Region: WARO Subbasin: TAR07
2001 N
— —
N
—
— N
— —
N
— —
PF: 0.22 Special
2002 N
— —
N
—
— N
— —
N
— —
7Q10:0.0 IWC(%; 100
2003 N
— —
H
Belhaven WWTP 24hr p/f ac Jim 90%mysid or fthd
1999 —
Pass —
—
Pass
— —
Pass —
—
Fail,Bt —
NCO026492/001 Begin:l0/1/2002 Frequency Q P/F + Feb May Aug Nov
+ NonComp Single
2000 —
Pass —
—
Pass
— —
Pass —
—
Pass —
County: Beaufort Region: WARD Subbasin: TAR07
2001 —
Pass —
—
Pass
— —
Pass —
—
Pass —
PF: 1.0 Special
2002 —
Pass —
—
Pass
— —
Pass —
—
Pass —
7Q10: Tidal IWC(%/ NA
2003 —
Pass —
—
Pass
Belmont WWTP chr Jim: 8%
1999 —
Pass —
—
Pass
— —
Pass —
—
NR/Pass —
NCO021181/001 Begin:10/1/1996 Frequency Q P/F + Feb May Aug Nov
NonComp Single
2000 —
NR/Pass —
—
Pass
— —
Fail -50
>50
Pass —
County: Gaston Region: MRO Subbasin: CTB34
2001 —
Pass —
—
Late
Pass —
Pass —
—
Pass —
PF: 5.0 Special
2002 —
Pass —
—
Pass
— —
Pass —
—
Pass —
7QI(): 95.0 IWC(%;8.0
2003 —
Pass —
—
Pass
Remain WWTP chr lim: 90%
1999 Pass
— —
Pass
—
— Pass
— —
Pass
— —
NCO020389/001 Begin:1 l/l/2000 Frequency Jan Apr Jul Oct
+ NonComp Single
2000 NRJPass
— —
Pass
—
— Pass
— —
Pass
— —
County: Johnston Region: RRO Subbasin: NEU04
2001 Pass
— —
Pass
—
— NR/Pass
— —
NR1Pass
— —
PF: L5 Special
2002 Pass
— —
Pass
—
— Pass
— —
Pass
— —
7Q10:0.0 IWC(%; 100
2003 Pass
— —
Pass
Biscoe WWTP chr lim: 90%
1999 >100
— —
>100
—
— >100
— —
>100
— —
NCO021504/001 Begin:8/1/1999 Frequency Q P/F + Jan Apr Jul Oct
+ NonComp Single
2000 >100
— —
>100
—
— >100
— —
>100
— —
County: Montgomery Region: FRO Subbasin: YAD15
2001 Fall
94.9 >100
Pass
—
— Pass
— —
Pass
— —
PF: 0.6 Special
2002 Pass
— —
Pass
—
— Pass
— —
Pass
— —
7Q10:0.0 IWC(%:100
2003 Pass
— —
Pass
Bladenboro WWTP chr lim: 90%
Y 1999 —
Pass
—
—
Fail
Pass
— Fail
Late
Fail
Late
NW>100
NCO026352/001 Begin:9/l2000 Frequency Feb May Aug Nov
+ NonComp Single
2000 —
Fail
Pass
—
Late
Fail
>100,>100 Pass
—
—
Late
Pass
County: Bladen Region: FRO Subbasin: LUM53
2001 —
Fall
61.2
>100,>100
Pass
—
— Pass
—
—
Fail
<25
PF: 0.50 Special
2002 >100
Pass
—
—
Pass
—
— Pass
—
—
Pass
—
7Q10:0.0 IWC(%;100
2003 —
Pass
—
—
Pass
Blowing Rock WWTP chr Jim: 61%
1999 Pass
—
—
Pass
—
—
Pass —
—
Pass
—
—
NCO027286/001 Begin:4/12001 Frequency Jan Apr Jul Oct
+ NonComp Single
2000 Pass
—
—
Pass
—
—
Pass —
—
Pass
—
—
County: Watauga Region: WSRO Subbasin: NEW01
2001 Pass
—
—
Pass
—
—
Pass —
—
Pass
—
—
PF: 0.80 Special
2002 Pass
—
—
Pass
—
—
Pass —
—
Pass
—
—
7Q10:0.80 IWC(%;60.78
2003 Pass
—
—
Pass
Blue Ridge Paper Products chr lim: 90%
V 1999 —
—
>100
—
—
>100
— —
Late
>100
—
81
NC0000272/001 Begin:l2/1/2001 Frequency Q Mar Jun Sep Dec
+ NonComp Single
2000 >100
>100
>100
—
—
>100
— —
>100
--
-
>100
County: Haywood Region: ARO Subbasin: FRB05
2001 —
—
>100
—
—
>100
— —
>100
---
—
>100
PF: 29.9 Special
2002 —
—
>100
—
—
>100
— —
92,5
—
—
Pass
7Q10:0 IWC(%; 100
2003 —
—
>100
—
Boone WWTP chr lim: 44%
V 1999 —
—
Pass
—
—
Pass
— —
Pass
—
—
Pass
NCO0206211001 BegmA/J2001 Frequency Q Mar Jun Sep Dec
+ NonComp Single
2000 —
—
Pass
—
—
Pass
— —
Pass
—
—
Pass
County: Watauga Region: WSRO Subbasin: NEWOI
2001 —
—
Pass
—
—
Pass
— —
Pass
—
—
Pass
PF: 4.82 Special
2002 —
—
Pass
—
—
Pass
— —
Pass
—
—
Pass
7Q10: 9.5 IWC(%;44.0
2003 —
—
NR/Pass
--
Y Pre 1999 Data Available
LEGEND:
PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A. Annually; O WD- Only when discharging; D- Discontinued monitoring requirement
Begin = First month required 7Q10 = Receiving stream low Flow criterion (cfs += quarterly monitoring increases to monthly upon failure or N Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement
PF = Permitted flow (MGD) 1 WC % = Instream waste concentmti P/F = Pus/Fail test AC = Acute CHR = Chronic
Data Notation: f - Fathead Minnow; • - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P - Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tax Unit; In - Bad test
Reporting Notation: --- = Data not required; NR - Not reporte Facility Activity Status: I - Inactive, N - Newly lssued(To construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed
4

\Priority Project Yes No XXX
\V
(� o: Permits and Engineering Unit
Water Quality Section
Attn : Jpi-par®n Cf
G N ,k;A -(AL-LC
O�NPS�v G�0 Date —October 11, 2002
NPDES STAFF REPORT AND RECOMMENDATION
County Johnston
Permit No. NC0020389 RENEWAL
PART I - GENERAL INFORMATION
1. Facility and Address: Town of Benson WWTP
P.O. Box 69
Benson, NC 27504
2. Date of Site Visit: October 3,2002
3. Report Prepared by: Ted Cashion, Environmental Chemist
4. Persons Contacted and Telephone Number:
Martin Morris, ORC 919-894-2373
5. Directions to Site: From Raleigh: Hwy 70 east to Smithfield,
left on Hwy 301 south, turn right at South Johnston High School,
cross I-95, turn right into facility.
6. Discharge Point(s), List for all discharge points:
*************see map for outfall location**********
Latitude: 35 23 22" Longitude:78 30 03"
Attach a USGS map extract and indicate treatment facility
site and discharge point on map.
U.S.G.S. Quad No. F24NE U.S.G.S. Quad Name Benson, NC
7. Site size and expansion area consistent with application ?
XXXX Yes No If No, explain:

8. Topography (relationship to flood plain included): Plant
appears to be located adjacent to floodplain
9. Location of nearest dwelling: at least Y2 mile
10. Receiving stream or affected surface waters: Hannah Creek
a. Classification: C-NSW
b. River Basin and Subbasin No.: 03 04 04
C. Describe receiving stream features and pertinent
downstream uses: swampy area
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: MGD(Ultimate
Design Capacity)1.5 mgd
b. What is the current permitted capacity of the Waste
Water Treatment facility? 1.5 mad
C. Actual treatment capacity of the current facility
(current design capacity) 1.5 mad
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: NA
e. Please provide a description of existing or
substantially constructed wastewater treatment
facilities: 2 earthen equalization basins, arc bar (mechanical bar screen),
grit chamber, 2 manual bar screens, influent parshall flume, ultrasonic flow meter,
3 screw pumps, alum and lime feed tanks when needed 3 oxidation ditches (1
used for nutrient removal), 4 peripheral feed clarifiers (2 @ 10' depth, 2 @ I
depth), 5 tertiary filters, dual chlorine contact chambers, dechlorination facility
(not currently used), post aeration tank, effluent flow meter with ultrasonic sensor
using 2 feet rectangular weir with end contractions, and 3 MG concrete lined
aerated sludge basin with 3 floating aerators.
f. Please provide a description of proposed wastewater
treatment facilities: NA
g. Possible toxic impacts to surface waters: ammonia,
chlorine

2.
3
V
h. Pretreatment Program (POTWs only):
in development
approved_xxxxx
should be required
not needed
Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DWQ
permit no. WO0012514
Residuals Contractor- out for bid, not known at
this time
Telephone No. NA
b. Residuals stabilization: PSRPxxxx
PFRP Other
C. Landfill:
d. Other disposal/utilization scheme (Specify):
Treatment plant classification (attach completed rating
sheet) : class 4.
SIC Code (s) : 4952
Wastewater Code(s) of actual wastewater, not particular
facilities i.e.., non -contact cooling water discharge from a
metal plating company would be 14, not 56.
Primary 01 Secondary
Main Treatment Unit Code: 107-3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved. (municipals only)? NA

5
2. Special monitoring or limitations (including toxicity)
requests: Dechlorination facilities are onsite but not currently
used becasue there is no chlorine limit. We recommend a chlorine
limit be included in the permit. Also, the ammonia limits should
be 1 mg/1 summer, and 2 mg/l winter, consistent with DWQ policy
for municipals with strict ammonia requirements. Also recommend
conductivity be dropped from effluent monitoring; stream
conductivity is satisfactory.
3. Important SOC, JOC or Compliance Schedule dates: (Please
indicate) NA
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated.
Spray Irrigation: NA
Connection to Regional Sewer System: Connection to the
Johnston County sewer system appears to be the only option,
apprximately 10 miles away.
Subsurface: NA
Other disposal options: NA
5. Other Special Items: See evaluations and recommendations.
PART IV - EVALUATION AND RECOMMENDATIONS
We have recently performed a CEI at this facility. The facility
had a weekly average BOD violation in April 2002; no other
violations have occurred in the past year.
The minimum 2 foot , freeboard requirement for the 2
equalization/sludge lagoons should remain in the permit.
Dechlorination facilities are onsite but not currently used
because there is no chlorine limit. We recommend a chlorine
limit be included in the permit because values >17 ug/1 have been
reported on the DMR. Also, the ammonia limits should be 1 mg/1
summer, and 2 mg/l winter, consistent with DWQ policy for
municipals with strict ammonia requirements (receiving stream

summer 7Q10 = 0; 30Q2 = 0.075) Also recommend conductivity be
dropped from effluent monitoring; stream conductivity is
satisfactory.
We recommend the permit be renewed with these items.
Signature of report preparer
Water Quality Regional Supe v'sor
Date

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IWC Calculations
Town of Benson WWTP (NC0020389)
Prepared By: Natalie Sierra, NPDES Unit
Enter Design Flow (MGD): 1.5
Enter s7Q10(cfs): 0
Enter w7Q10 (cfs): 0
Residual Chlorine
Ammonia (NH3 as N)
(summer)
7Q10 (CFS)
0.05
7Q10 (CFS)
01
DESIGN FLOW (MGD)
0.011
DESIGN FLOW (MGD)
1.5 -'.
DESIGN FLOW (CFS)
0.01705
DESIGN FLOW (CFS)
2.325
STREAM STD (UG/L)
17.0
STREAM STD;(MG/L)
1.0
UPS BACKGROUND LEVEL (1
0
UPS BACKGROUND LEVEL
0.22-
IWC (%)
25.43.
IWC (%)
100.00
Allowable Conc. (ug%I)
67
Allowable Conc. (mg/1)
1.0
Ammonia (NH3 as N)
(winter)
7Q10 (CFS)
0
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
1.5
(If DF >331; Monitor)
DESIGN FLOW (CFS)
2.325
(If DF <331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
3.93
UPS BACKGROUND LEVEL
0.22
IWC (%)
100.00
Allowable Conc. (mg/1)
1.8
INPDES Servor/Current Versions/IWC
6/26/03

•
The
Wooten
Company
Engineering
Planning
Architecture
November 1, 2002
Mr. Charles H. Weaver
NCDENR - NPDES Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: Request for Permit Renewal
NPDES Permit No. NCO020389
Town of Benson, North Carolina
Dear Mr. Weaver:
On behalf of the Town of Benson, enclosed please find one (1) original and two (2)
copies of the following items to request renewal of the above referenced permit:
1. EPA Form 1
2. EPA Form 2A including results from:
• One (1) Priority Pollutant Analysis
120 N. Boylan Avenue • Two (2) Toxicity Tests
Raleigh, NC
27603 3. Sludge Management Plan
4. Written Documentation for Authorized Representative
No major modifications have occurred at the facility since isuance of the most recent
919-828-0531 permit. If you should have any questions about the enclosed materials, please contact
Fax: [phone] our office at [phone].
Since 1936
Sincerely,
THE W,.,,OOT'ENf OMPANY
Gary D. arton
Enclosures
cc: Keith Langdon, Town of Benson
Martin Morris, Town of Benson
NOV - 1 2002 10
DENR-WATER QUALITY
POINT SOURCE BRANCH

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN: .
Benson WWTP, NCO020389
Renewal
Neuse
F:5 �` ?ENa: �' �'Si Y r < 5t yZ Y:- Y " TS ak* '�'� X•^h4kx'\ 5..} I'c 'L"; t �,
INFORMATIONnm #�
SUPPLEMTALtAPPLICATION
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xiv F �£1 +� .Yi" 4, �� � �.� F� l : � i �& �. `fir Mis„uT ,:5 ,-f • .;:
PART INDUSTRIAL USER4DISCHARGES AND.RCRA/CERCLA WASTES5���kj
F
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject ot, an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of .
industrial users that discharge to the treatment works.
a. Number of non -categorical SIUs. 1
b. Number of CIUs. 0
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions,F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: PGI Nonwovens d.b.a. Chicopee Inc
Mailing Address: 1403 Chicopee Road
Benson North Carolina 27504
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU s discharge.
Manufacturing of non -woven textile products
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU s
discharge. .
Principal product(s): Non -woven roll goods for medical end use and industrial end use
Raw material(s): Staple fibers surfactants pigments anti -foams. DH adjuster. thickeners
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
457,000 gpd ( X continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
174,000 gpd ( X continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Benson WWTP, NCO020389.
Renewal
Neuse
'F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ .Yes 19 No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9.. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ , Yes ® No (go to F.12)
0.10. Waste transport Method by which RCRA waste is received (check all that apply):
-❑:Truck ❑ Rail ❑ Dedicated. Pipe.
F.,11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
n/a n/a n/a
n/a n/a n/a
n/a n/a n/a
.CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
.WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) ® No
F.13..Waste Origin.' Describe the site and type of facility at which the, CERCLA/RCFWor other remedial waste originates (or is excepted to origniate in
the next five years).
n/a
FA4. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and coricentration, if .
known. (Attach additional sheets if necessary.)
n/a
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑.Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
n/a
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous ❑ Intermittent If intermittent, describe discharge schedule.
�a ',END(OF PART�F�
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Filter Backwash Waste
.
:Chlorine Contact Bas
Dechlonriation System
6:056
Filters "
Post Aeration Tank
Pump Station 1.1s
1.15'
1.lsmgdADF Effluent
w/ Sludge Recirc.
_ — 0.014 1.15
Backwash Water Storage -
Sludge
Filter Backwash Clear Water '
Waste — o.9z —
I., IIII I
I -
I
Sludge Recirculation
_
I JI I I I
Clarifier #4 ! Clarifier #2
I It'
1
Aeration Tank #3 -
—►
III
I 0.23/ III \\0.23
J'I `--►I
I III
I I
0.29 0.29
i I �=
I I 1 \
I l0.92
I
I I 0.58
I 0.52 / I \ 0.52
Alum I I
Handling) I �—
Aeration Tank #2
/ \ 2.07
Unit
1.15
0.23/ 0.23
\\
0.52
LimeOI 1.150.52
I
Handling
�
0.29 0.29
\
Unit 1.15 0.58
_
Aeration Tank #-1
II
S.B
�
I
0.072
I Clarifier #3 Clarifier #1
I
Screw Pumps �—
Influent
I Comminutor Bypass 1 15
Screen
1.15 mgd ADF
1 1.15 1.15
Mechanical
I Grit Chamber Parshall Flume
Lagoon Effluent Return
Bar Screen
0.072
0.072
-
.
Equalization
Basin
Aerated Sludge Basin
Legend:
0 Existing Facility
— Wastewater Piping
-- Scum/Sludge Piping
SCHEMATIC OF EXISTING
BENSON WASTEWATER TREATMENT FACILITY

Sludge Management Plan
Benson Wastewater- Treatment Plant
NPDES Permit No., NC0020389
Non -Discharge Permit No: WQ0012514
The -Town of Benson operates a 1.5 mgd modified biological nutrient removal (BNR) plant
which discharges,its effluent into Hannah Creek in the Neuse liver Basin under NPDES Permit
No.. NC0020389: Waste sludge from the modified. BNR plant is discharged to the existing
5,247,000 .gallon capacity. aerated basin for long-term sludge stabilization and storage.
- ,Periodically, the sludge is allowed to settle in the basin and the supernatant is` withdrawn and
recycled back to the plant headworks for reprocessing. The stabilized sludge which meets pollutant
limits.and Class B pathogen reduction and vector attraction reduction requirements is later disposed
of in accordance with Non -Discharge Permit No. WQ0012514.
The Class B pathogen reduction requirements are met using either Alternative 1 [Monitoring of
,Fecal Coliform, 503.32(b)(2)] or Alternative 2 [Use of PSRP, 503.32(b)(3)]. The vector attraction
reduction requirements are met using Option 3 [503.33(b)(3)], Option 6 [503.33(b)(6)], Option 9
f [503..33(b)(9)], or Option 10 [503.33(b)(10)].