NC0020389_Permit Issuance_20100315

s'
* 4 ..
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 15, 2010
Mr. Keith Langdon
Town Manager
Town of Benson
Post Office Box 69
Benson, North Carolina 27504
Subject: Issuance of Renewal NPDES Permit
NPDES Permit NCO020389
Town of Benson WWTP
Johnston County
Class IV
Dear Mr. Langdon:
Dee Freeman
Secretary
The Division has 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).
Summary of Changes in Renewal Permit from Existing Permit
1) Total Chromium Compliance Limits have been removed and Monitoring reduced to Monthly in this
permit. Total Chromium is a pollutant parameter of interest. The RPA evaluation indicates no
potential to exceed the water quality standard. Consequently, there is no justification to have
compliance limits. But with the continued non -domestic contributor monitoring will remain at a
reduced frequency. Terms and conditions exist to re -open this permit if the reported data warrants
re-evaluation for compliance limits.
2) Total Nickel Compliance Limits have been removed and Monitoring reduced to Monthly in this
permit. Total Nickel is a pollutant parameter of interest. The RPA evaluation indicates no potential
to exceed the water quality standard. Consequently, there is no justification to have compliance
limits. But with the continued non -domestic contributor monitoring will remain at a reduced
frequency. Terms and conditions exist to re -open this permit if the reported data warrants re-
evaluation for compliance limits.
3) A Total Mercury Compliance Monthly A verage Limit has been added to this permit. Total Mercury is
a chronic pollutant parameter and as such its compliance limit is subject to accumulative effects.
Consequently, a monthly average compliance limit must be determined and implemented. EPA
guidelines also require two limits be imposed so the daily maximum limit will remain.
Page 1 of 2
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 One
Phone: [phone] FAX: [phone] Customer Service:1-877-623-6748 North Carolina
Internet: http:!/h2o.state.nc.uslc A-��}���������
An Equal Opportunity 1 Affirmalive Action Employer �7/�/

4) A Special Condition, Total Nitrogen Allocations, has been added to this permit. This is an addition to
further clarify the Total Nitrogen Allocation and its terms and conditions.
5) A Total Nitrogen Load Limit has been changed in this permit. As part of the approved trade the
annual Total Nitrogen Load Limit was reduced to 33,070 Ib/yr with an effective date retroactive
back to January 1, 2010.
6) A Total Residual Chlorine (TRC) footnote has been corrected in this permit. This is a correction to
update the text to (1) clarify what compounds constitute TRC compliance and to (2) define
reporting protocol in lieu of the recognized detection limit.
7) A. Total Mercury test Method has been noted in this permit. This defines the.Total Mercury
measurement test requirement as Method 1631 E.
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 permits that may be required.
Because of the nutrient trade with the Johnston County facility (NC0030176) your permit was
potentially impacted by a public hearing held in September 2009 for several NPDES permits including
Johnston County. For consistency the Division determined the issuance of your permit should coincide with
the issue date and effective date of the Johnston County Permit. Your permit expiration date will remain
aligned with your subbasin next renewal date, April 30, 2013.
If you have any questions concerning this permit, please contact Ron Berry at telephone number
[phone].
Sincerely,
r^ ,
Coleen H. Su lif ns
Attachments
Cc: Raleigh Regional Office/Surface Water Protection Section (email with revised Fact Sheet)
Marshall Hyatt/EPA Region 4 (email with revised Fact Sheet)
Monti Hassan/PERCS Unit (email)
Environmental Sciences Section/Aquatic Toxicology Unit/Susan Meadows (email)
Mr. Haywood Phthisic, Executive Officer, NCRA (email)
Central Files
NPDES Unit
Page 2 of 2

PermitNCO020389
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
magar "
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 21-95)
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 April, 1, 2010.
This permit and authorization to discharge shall expire at midnight on April 30, 2013.
Signed this day March 15,. 2010.
4C _ Coleen Fr Sullins, Directof
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NCO020389
4
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, t3nd provisions included, herein.
PA
The Town of Benson is hereby authorized to:
Continue to operate an existing 1.9 MGD wastewater treatment facility, located at the
Benson WWTP off Hannah Creek Road in Four Oaks in Johnston County, consisting of the
following equipment:
Bar screen
Grit removal
Parshall flume with flow measurement
Influept composite sampler
Influent screw pumps
Three extended aeration/oxidation basins/nutrient reduction
Five secondary clarifiers
Tertiary filters
Chlorine contact basin
Dechlorination
Post aeration
Effluent flow measurement
Effluent composite sampler
Alum and lime storage/handling units,
Aerated sludge lagoon S
Two stabilization lagoonV(also act as influent flow storage)
Lagoon effluent return pump station
Backup generator; and
3. Operate facilities for reuse water up to 0.02324 MGD in accordance with Non -Discharge
permit WQ0022501; and
3. Discharge wastewater from said treatment works at the location specified on the attached
map into Hannah Creek, classified C-NSW waters in the Neuse River Basin.

� r' �-
, � R,
-le POL-It
z
� 1 ^':.-yam � _. . ... '• � S �./" _ Y
I
NCO020389-
. _ Facilatv
I
tee ': 4 ' L+ c Disr-ha' ge
L+p"E- t ;
PdndS
— Upstream
Sample Point
t
-
d
T 1 • i5�. �i -
iCern
j
Facility
`{ `
Location
Town of Benson WWTP NCO020389
North
Johnston County ,

Permit NCO020389
A. (l.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized
to discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored by the
Permittee as specified below:
LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Daily
Measurement
Sample
Sample
EFFLUENT CHARACTERISTICS
Average
Average
Maximum
Frequency
Type
Locations
Flow
1.9 MGD
Continuous
Recording
Influent or
Effluent
Recorded
Total Monthly Flow (TMF) z
Monitor and Report, (MG)
Monthly
or
Effluent
Calculated
BOD, 5 day (20°C) 3
5.0 mg/I
7.5 mg/I
Daily
Composite
Influent &
[April 1—October 311
Effluent
BOD, 5 day (20°C) 3
10.0 mg/I
15.0 mg/I
Daily
Composite
Influent &
[ November 1—March 31]
Effluent
Total Suspended Solids (TSS) 3
30.0 mg/l
45.0 mg/I
Daily
Composite
Influent
f fluent &
Ammonia as Nitrogen (NH3- N)
[ April 1— October 31]
1.0 mg/I
3.0 mg/l
Daily
Composite
Effluent
Ammonia as Nitrogen (NH3 — N)
[ November 1— March 31]
2.0 mg/1
6.0 mg/I
Daily
Composite
Effluent
pH
Not more than 9.0 s.u. nor less
Daily
Grab
Effluent
than 6.0 s.u.
Dissolved Oxygen, mg/I (DO)
Not less than 6.0 mg/l, daily
Daily
Grab
Effluent
average
Dissolved Oxygen, mg/I (DO)
Variablel
Grab
U & D
Fecal Coliform (geometric mean)
200/100
ml
400/100
ml
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
Variablel
Grab
U & D
Temperature, (9C)
Daily
Grab
Effluent
Temperature, (°C)
Variablel
Grab
U & D
Conductivity, mohms/cm
Daily
Grab
Effluent
Conductivity, mohms/cm
Variablel
Grab
U & D
Total Residual Chlorine (TRC) °
17 µg/I
Daily
Grab
Effluent
Total Mercury (Method 1631 E)
0.012 µg/I
0.012 µg/I
Weekly
Grab
Effluent
Total K'eldahl Nitrogen (TKN) 5
Monitor and Report, (mg/1)
Weekly
Composite
Effluent
Nitrate and Nitrite Nitrogen
(NO — N + NO — N) -5
Monitor and Report, (mg/1)
Weekly
Composite
Effluent
Total Nitrogen (TN) Z's
TN = TKN + (NO3 — N + NO, — N)
Monitor and Report, (mg/1)
Weekly
Calculated
Effluent
TN Load z
Monitor and Report
(lb/month)
Monthly
Calculated
Effluent
TN Load = TN x TMF x 8.34
33,070 Ib/yr (effective 1/1/10) 6
Annually
Calculated
Effluent
Total Phosphorus (TP)
2.0 mg/I (Quarterly Average) 7
Weekly
Composite
Effluent
Total Copper, µg/I
2/Month
Composite
Effluent
Total Zinc, µgll
2/Month
Composite
Effluent
Total Chromium, µg/I
Monthly
Composite
Effluent
Total Nickel, µg/I
Monthly
Composite
Effluent
8
Chronic Toxicity
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Annually
See A. (7.)
Effluent

PermitNCO020389
(Continued from A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
Footnotes:
1. U: Upstream at the culvert on NCSR 1158. D: Downstream at NCSR 1227. Stream samples shall be grab
samples collected 3/Week from June to September and 1/Week during the remaining months of the year.
lnstream monitoring is provisionally waived in light of the Permittee's participation in the Lower Neuse
Basin Association. lnstream monitoring shall be conducted as stated in this permit should the Permittee
end its participation in the Association.
2. Total Nitrogen Load is the mass quantity of Total Nitrogen (TN) discharged in a given period of time and
• requires Total Monthly Flow (TMF). See condition A. (3.}. Calculation of Total Nitrogen Load.
3. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of
the respective influent value (85% removal).
4. Total Residual Chlorine compliance is required for chlorine or chlorine derivative used for disinfection. The
Division shall consider all effluent TRC values reported below 50 ug/I 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/I.
5. For a given wastewater sample, Total Nitrogen (TN) = TKN + (NO3 N + NO,-N) where TKN is Total Kjeldahl
Nitrogen, and (NO3-N + NOZ N) is Nitrate and Nitrite Nitrogen..
6. Compliance with this limit shall be determined in accordance with conditions A. (4.) Annual Limits for Total
Nitrogen. and A. (5.) Total Nitrogen Allocations.
7. The quarterly average for total phosphorus shall be the average of composite samples collected weekly
during the calendar quarter (January -March, April -June, July -September, October -December).
8. Chronic Toxicity (Ceriodaphnia dubia) P/F at 90%: January, April, July, and October [ see condition A. (2.)].
Toxicity monitoring shall coincide with metals monitoring.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

PermitNCO020389
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 90016.
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
January, April, July and October. Effluent sampling for this testing shall be performed at the NPDE$
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. If reporting pass/fail
results use the parameter code TGP3B and DWQ Form AT -I, sending AT-1 (original) to the below
address. If reporting Chronic Value results use parameter code THP3B and DWQ FORMAT-3, sending
AT-3 (original) to the following address:
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 alternate 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 and reporting of the data submitted on the DMR,
and all 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 NC0020389
A. (3.) CALCULAT ION OF TOTAL NITROGEN LOADS
a. The Permittee shall calculate monthly and annual TN Loads as follows:
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
ii. 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.
ii. Association roster(s) and members' TN allocations will be updated annually and in
accordance with state and federal program requirements.

Permit NCO020389
(Continued from A. (4.) ANNUAL LIMITS FOR TOTAL NITROGEN)
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. '
e. 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.) TOTAL NITROGEN ALLOCATIONS
a. The following table lists the Total Nitrogen (TN) allocation(s) assigned to, acquired by, or
transferred to the Permittee in accordance with the Neuse River nutrient management rule (T15A
NCAC 02B .0234) and the status of each as of permit issuance. For compliance purposes, this
table does not supercede any TN limit(s) established elsewhere in this permit or in the NPDES
permit of a compliance association of which the Permittee is a Co-Permittee Member.
ALLOCATION
ALLOCATION AMOUNT (1)
-TYPE
SOURCE
DATE
STATUS
Estuary (lb/yr)
Discharge (lb/yr)
Base
Assigned by Rule
12/7/97;
16,895
33,790
Active
(T15A NCAC 02B .0234)
4/1/03
Decremental
Sale to Johnson County
4/2/08
360
720
Deducted
NC0030716
TOTAL
16,535
33,070
Active
Footnote:
(1) Transport Factor = 50%
b. Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change in status of any of the listed allocations shall be considered a
major modification of this permit and shall be subject to the public review process afforded such
modifications understate and federal rules.
A. (6.) 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. (7.) EFFLUENT POLLUTANT SCAN
The permittee shall perform Effluent Pollutant Scans for all parameters listed in the attached table (in
accordance with 40 CFR Part 136). Samples shall be collected in different calendar years, approximately
annually, except to provide seasonal variation. Unless otherwise indicated, metals shall be analyzed as "total
recoverable."
Ammonia (as N)
Trans-1,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine, total residual (TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhex+yl) 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
Tetra ch I oroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable Compounds
Diethyl phthalate
Mercury (Method 1631E)
P-chloro-m-creso
Dimethyl 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 Compounds
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamirie
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-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
The Permittee shall report test results within 90 days of sample collection to the Division in DWQ Form- DMR-
PPA1 or other form approved by the Director (see NPDES Unit web site). 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
Submittal of PPA results with NPDES renewal applications will be required.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT RENEWAL DEVELOPMENT
NPDES No. NCO020389
REVISED: 3111110
Facility Information
Applicant/Facility
Name:
Town of Benson WWTP
Applicant Address:
P.O. Box 69; Benson, North Carolina 27504
Facility Address:
770 Hannah Creek Road; Four Oaks, North Carolina 27524
Permitted flow
1.9 MGD
'
Type of Waste:
domestic/industrial with pretreatment program
Facility/Permit Status:
Class IV /Active; Renewal
County:
Johnston County
Miscellaneous
Receiving Stream:
Hannah Creek
Stream Classification:
C, NSW
Subbasin:
03-04-04
Index No.
27-52-6
Drainage Area (miz):
10.5
303(d) Listed?
Yes
Summer 7Q10 (cfs)
0
Regional Office:
Raleigh
Winter 7Q10 (cfs):
0.12
State Grid / USGS
Quad:
F24NE
Benson, NC
30Q2 (cfs)
0.25
Permit Writer:
Ron Berry
Average Flow (cfs):
,12.0
Date:
8/10/0Q
IWC (%):
100%
Revised.- RDB
3/II/10
BACKGROUND
The Town of Benson operates a 1.9 MGD wastewater treatment system, that serves Benson,
population 2,955, and the surrounding community. There is one major non -categorical
industrial discharger, PGI Nonwovens, that utilizes 33% of the existing treatment capacity, a
pretreatment program is in place. The Benson Plant discharges treated domestic/industrial
wastewater to Hannah Creek, a class C Nutrient Sensitive Water (NSW) water in the Neuse
River Basin. This portion of Hannah Creek that receives the Benson facility discharge is
impaired for low oxygen.
A permit modification for 1.9 MGD was approved and issued in January 2006 with a new 50%
reduced compliance limit for ammonia nitrogen and with no increase in total pounds of
annual total nitrogen discharge. The ammonia as nitrogen limits meet water quality
standards but were reduced to sustain the total oxygen consumption loading at a level less
than the 1.5 MGD oxygen consumption loading capacity.. The Authorization to Construct the
1.9 MGD expansion was issued September 2006 and provided advance technology to
improve nutrient reduction and other increased capacity treatment processes. The NPDES
renewal application requested a renewal permit for the 1.9 MGD capacity. The signed
Engineering Certificate for -the 1.9' MGD capacity has been received.
Hannah Creek is impaired, an ambient station was installed upstream of the Benson facility.
Subsequent instream (2008 report) studies have shown the oxygen impairment- and fecal
coliform variation in Hannah Creek were from other sources not the Benson treatment
facility. The DMR data indicates no reported effluent dissolved oxygen levels below the water
quality minimum standard.
The treatment process uses a bar screen, a grit chamber, and three extended oxidation
ditches to provide aerobic and anaerobic zones for nutrient reduction. Two lagoon serves as
a equalization basin. The wastewater exists the ditches, goes through a clarifier"system, and
then through a final tertiary filter. The filtered water is chlorinated, dechlorinated, aerated,
and then discharged. A third lagoon is used to separate and store sludge.
The permittee has an approved sludge management plan. The facility has a permit to
irrigate local sport fields with designated reuse water. The Permittee plans on adding other
reuse water opportunities.
Fad_ Sht�et
t+iPDFS, �N'C0. w"01389

e Water Quality Considerations - 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. 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.
VIOLATIONS 2006-2008
There were six permit violations:
1) Two violations exceeded the month average flow limit
2) One violation exceeded the daily max mercury limit
3) Three pH violations, one greater than 9.0s.u. and two less than 6.0 s.u.
PERMITTING STRATEGY
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 from April 2006.to April
2008, four effluent HWA from 2005 to 2007, and from the three PPA submitted with the
renewal application. Evaluations were conducted for arsenic, beryllium, cadmium, chromium,
copper, cyanide, lead, mercury, molybdenum, nickel, phenols, selenium, silver, toluene, and
zinc.
Results suggest reasonable potential for the facility to discharge copper, mercury, and zinc
at concentrations above prevailing water quality standards. Copper and zinc are also action
level toxicants but the Permittee has passed all quarterly chronic toxicity tests. Therefore,
copper and zinc monitoring will remain unchanged in the,, permit. Mercury has exceeded it
existing daily limit and the RPA suggest reasonable potential to continue to exceed
prevailing water quality standards. Mercury is a chronic pollutant parameter so compliance
will be amended to add a monthly average weekly maximum limit. To meet EPA criteria for
dual limits the mercury daily maximum limit will remain. Method 1631E is required for a#
mercury testing.
Chromium and nickel were limited by the permit but there have been no limit violations. The
RPA results suggests no reasonable potential to exceed prevailing water quality standards.
Therefore, chromium and nickel will be reduced to monthly monitoring and the limts
removed. Arsenic, beryllium, cadmium, cyanide, lead, phenols, selenium, silver, and toluene
RPA results suggest no reasonable potential to exceed ,prevailing water quality standards.
PF,gcg : 2 o i 5

Therefore, there will be no .action to include these metals in this permit. Molybdenum does
not currently have a water quality standard. These metals will continue.to be monitored in.
the pretreatment areas where required and the PPA.
Data review
DMRs were reviewed for the period of April 2006 to. April 2008. DM'R data is summarized in
Table I below:
Table I
Flow
Dissolved
BOD
TSS
NH3,-N
Fecal
Total
Residual
(MGD)
Oxygen
(mg/L)
(mg/L)
(mg/L)
(mg/1)
rm
Coliform
(#lifo ml)
Chlorine
(mg/1)
Average
1.3
9.6
6.8
4.9
.0.4
5.9
6
Maximum
1.6
12.6
15.1
10.2
1.0
52.5
18
Minimum
1 0.8
6.1
5.0
< 1
0.2
<1
1
Percent Removal: Based on BOD 89.6%-99.5%, Based on TSS 93.1% - 96.7%
Whole Effluent Toxicity
The permit requires quarterly chronic toxicity testing using ceriodaphnia dubia, at 90%
effluent concentration. The facility passed the twelve toxicity tests submitted since April
2005. Three of the submitted second species, pimepha/es prome/as, chronic toxicity results
were Chv >100. The fourth, second species, test result was ,Chv = 82.2. Will ..continue
quarterly chronic toxicity testing.
Priority Pollutant Analysis
The results of three PPA were submitted with the permit renewal application. See RPA
Analysis for results. Will continue to require submittal of PPA annually.
Instream Data
The Permittee joined the Lower Neuse Basin Association in 2004. The Association is
responsible for all instream monitoring for its members. As a result the Permittee requested
and was granted a wavier for instream monitoring. A modified permit was issued in 2004
reflecting the wavier condition. The narrative will be corrected to reflect the current
instream sample locations and the locations added to the map. Will continue the same
wavier condition in this permit.
Effluent Limitations and Monitoring Requirements
BOD
During the current permit cycle no violation occurred. BOD is a primary pollutant parameter
for domestic waste effluent, BOD monitoring/limits will continue, minimum 85% removal
criteria will continue.
TSS
During the current permit cycle no violation occurred. TSS is a primary pollutant parameter
for domestic waste effluent, TSS monitoring/limits will continue, minimum 85% removal
criteria will continue.
PH
During the current permit cycle three violations occurred. The pH is a primary pollutant
parameter for domestic waste effluent, pH monitoring/limit range will continue.
Disolved Oxygen (DO)
During the current permit cycle no violation occurred. DO is a primary parameter of concern,
the DO monitoring/limit will continue.
Fecal Coliform
During the current permit cycle no violations occurred. Fecal Coliform is a primary bacteria
parameter and as such its monitoring/limits will continue. I - U
Fact 4�zheet
Pago 3 of 5

Ammonia as Nitrogen (NH3-N)
During the current permit cycle no violations occurred. Ammonia as nitrogen is a primary
toxicant parameter and oxygen consumer. The 1.9 MGD ammonia as nitrogen limits were
established to set the oxygen consumption loading to be the same as the 1.5 MGD oxygen
consumption loading. The monitoring /limits will continue.
Total Phosphorus (TP)
During the current permit cycle no violations occurred. TP is a rwtrient of concern and. is
limited by the nutrient rules, the TP monitoring/limit will continue.
Mercury
During the current permit cycle one violation occurred., The RPA indicates Mercury
compliance may be an issue. Mercury monitoring/limit will continue with the chronic limit
defined as a weekly average. Per EPA guidelines a monthly average was added.
Total Nitrogen (TN)
Total Nitrogen (TN = (NO2-N + NO3-N) + TKN) is a nutrient of interest and is required .to
calculate the monthly TN Load and the annual TN Load, and as such monitoring will
continue.
TN Load
The permit includes nutrient limits consistent with the Nutrient Management Strategy rule
T15A NCAC 2B .234). Under the new rule the Permittee received a TN Load limit of 33,790
Ib/yr, a calendar year. Effective January 1, 2009 the Permittee was granted approval to sell
720 Ib/yr and reduced its TN Load limit to 33,070 Ib/yr, a calendar year. The 33,070 /b/yr
limit is effective I/Z/10. The Permittee 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 Load limit in this permit, and its TN Load discharge is governed
instead by the Association group NPDES permit, issued December 30, 2002.
Chronic Toxicity
The effluent consistently passes its quarterly chronic toxicity test. To stay in compliance with
Division standards quarterly chronic toxicity test will continue.
Effluent Monitorina Reauirements
Zinc. Cooper. Nickel. and Chromium
Zinc and copper are action level parameters and as such are evaluated against the toxicity
test results. The RPA for zinc and copper suggest potential to. exceed water quality
standards. Will continue to monitor 2/Month and compare against toxicity test. Nickel and
chromium RPA suggest no potential to exceed water quality standards. Nickel and chromium
are part of the pretreatment program. Will remove limits and reduce monitoring
requirements to monthly.
Temperature
Temperature is a parameter of concern. There are applicable water quality standards
including, measurements in the receiving stream. Historical data suggest no water quality
issues, monitoring protocol will continue.
Conductivity
Conductivity is a parameter of concern for any discharge with industrial influent. The impact
to the receiving stream is a point of interest, monitoring protocol will continue.
Special Condition Requirements
Lagoon Freeboard Height Requirement
The Lagoon freeboard height is a narrative safety_ limit established for.this facility. The same
special condition will continue for all three lagoons.
• Fact 511wl iot
Page. 4ro5

Total Nitrogen Allocations
A summary of the Permittee annual TN Load allocation including any adjustments to sales or
purchases of TN Load were listed. Further details on the applicable transport factor and
impact to the Neuse River estuary were also included.
SUMMARY OF PROPOSED CHANGES
In keeping with Division policies the following will be incorporated into the permit:
0 Effluent limitation and monitoring requirements for chromium will change. Limits
will be removed and monitoring reduced to monthly.
0 Effluent limitations and monitoring requirements for nickel will change. Limits will
be removed and monitoring reduced to monthly.
0 Effluent limitation for mercury will be amended. The limit is chronic so therefore a
weekly monthly average and Fnenthly aveFage limit will be imposed and the daily
limit Femoved remain.
0 Effluent limit for annual TN Load will be modified to show adjusted limit.
0 Special condition summarizing annual Total Nitrogen Load Allocation will be added.
0 TRC footnote was amended to state reporting protocol.
0 Mercury measurement Method 1631 E was noted.
SCHEDULE FOR PERMIT ISSUANCE
Because this permit included a nutrient trade with Johnston County (NCO030176), and the
Johnston County permit was part of three permit renewals involved in a public hearing, the
Division determined this permit should be issued at the same time as the Johnston County
permit. The Johnston County permit was released for issuance in March 2010. Consequently,
the Benson facility approved permit will be issued to correspond to Johnston County
approved permit issuance using the identical issue date and effective date The expiration
date will remain aligned with the subbasin scheduled renewal date.
Permit Effective: April 1, 2010
Permit Expires: April 30, 2013
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit,
please contact Ron Berry at [phone] or email [e-mail].
NAME: r iv F DATE: 3 /l 0
REGIONAL OFFICE COMMENTS
NAME:
SUPERVISOR: DATE:
DATE:
rt
5

Berry, Ron
V
From: [e-mail]
Sent: Wednesday, August 26, 2009 9:19 AM
To: Berry, Ron
Subject: re NC0020389, Town of Benson WWTP
EPA has no comments on this draft permit.

AFFIDAVIT OF PUBLICATION
NORTH CAROLINA.
Wake County.) Ss.
Public Notice
North Carolina
Environmental Management
Commission/'NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617.
Notice of Intent
to Issue a NPDES
Wastewater Permit
The North Carolina Environmental Man-
agement Commission proposes -to issue a,'
NPDES wastewater discharge permitto the,
person(s) listed below.
Town of Benson -has requested renewal of
permit NCO020389 in Johnston County. This
permitted discharge is treated domestic
wastewater to Hannah Creek.in the Neuse
River Basin.
N9.0: August 22, 2009 ,E
Before the undersigned, a Notary Public of Chatham
County North Carolina, duly commissioned and authorized to
administer oaths, affirmations, etc., personally appeared Debra
Peebles, who, being duly sworn or affirmed, according to law,
doth depose and say that she is Accounts Receivable Specialist
of The News and Observer a corporation organized and doing
business under the Laws of the State of North Carolina, and
publishing a newspaper known as The News and Observer, in
the City of Raleigh , Wake 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: 08/22/09
Account Number: 73350833
The above is correctly copied from the books and files of the aforesaid Corporation and publication.
```e,t4IIfIfitj7rf
!®o� o,,el Scro
otary9"� sPS
a
0: �G
'at 1`� aeo
Debra Peebles, Accounts Receivable Specialist
Wake County, North Carolina
Sworn or affirmed to, and subscribed before me, this
24 day of AUGUST , 2009 AD ,by Debra Peebles.
In Testimony Whereof, I have hereunto set my hand
and affixed my official seal, the day and year aforesaid.
Janet SCroggS, Notary Public
My commission expires 10 of March 2014.

DMR Data NCO020389 Date: 10/31/08
Town of Benson WWTP pb:rdb
O Flow Rdg
■ Flow Monthly Avg —Permitted Flow
3.500
-
--------
3.000
------
-----
--------------
----
2.500
-
0---------- O O
--
------------
O
02.000
---
------ OQ�O-----00ilk
----00
O
1.500
00
1.000
- -
- - -
Q
O
O
O
O
0.000
LO
0
LO
0
LO LO LO CO co
0 0 0 0 0
(O (0 0 Lfl r-
0 0 0 0 0
r
0
r` n
0 0
r- r, °0 co
0 0
(P 0OD
Q
Q O p LL Q
Q O p Li
Q
cp
Q
O p L Q
BOD Monthly Avg
O BOD Weekly Avg
--
Monthly Max Limit
Weekly Max Limit — X BOD % Removal
% Removal
--
Min Limit
50
-------
--- --
—
--
--- ----
100%
45
40
----
-
----- ---- --- -
------------
-- --
95%
35
- ---
-----------------
------------
------ -
30
J
ar25--
-
-------
----
-
----------
O
E 20 O
O
85%
O
O------
----
10 --
-
QO-01 ---------------0---------
�-
C --
--
-
80%
5
-O■-
0-�--fl --
Q-
0
"�" `^'�'� �'
75%
U')
0
LO
0
LO U') LO c0 LO
0 0 0 0 0
(0 LO r r`
0 0 0 0
r
0
n r`
0 0
W 00
0 0
Q
c
0)> c c
Q Zco
-0)> c
D 0 cc Q Z Q
c
c> >
Q Zcu
c
Q
■ TSS Monthly Avg
O TSS Weekly Avg
--
--Monthly Max Limit
Weekly Max Limit X TSS % Removal
% Removal
Min Limit'
50
-----
-
-
100%
45
40
-
- --------V ----------------
95%
35
----------------
------------------------------------
90%
30
025
O
E
E
20
85%
15-----------
*-------------------------------------------------------
10
------0-
--------
---------------------------
--
80%
OW
75%
0
LO
9
LO
0
LO LO co GO co
0 0 0 9 0
co to r` r`
0 0 0 9
n
0
rl- n
0 0
CO co
0 9
Q
c
a > c c
Q Z -
o> > c
Q Z � Q
c
of >
Q Z
c
� Q

DMR Data NCO020389 Date: 10/31/08
Town of Benson pb:rdb
O
Fecal Coliform Weekly Avg ■ Fecal Coliform Monthly Avg Monthly Max Limit Weekly Max Limit
450
400
350
300
----------------------------------------------------------------------
E250------------------------------------------------------------
----------
0
0
200
150
100
--------------------
------------------------------------------------
50
-
------ ----------------- --------------------------
0
LO LO LO
0 0 0
LO LO c0 c0 (0 c0 c0 c0 r` rn r` rn rn r` 00 00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q Q
O p LL Q Q O 0 LL ¢ � Q O CDLL Q
O pH Rdg ®Range Limits
10
--------------------------------
O
9
8
----------------------------------------------------
-------------------
6
5
-----------------------------------------
----------
4
LO
0
LO to
0 0
LO LO CO co CO CD CO (0 r` r` r` n r\ r` CO CO
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
C m
Q Q
t 0 n C CD t5 U -0 C m 0
O t? LL Q -"j Q O 0 LL Q Q O LL Q
O DO Rdg -Min Limit
14
- -----------------
12
10
---------------
------------
O ------------------------
O O
-----------------------Von
O
Ap
� O
8
----
------------0 0--------
E 6
--------------
-------------- - ---
0
LO
0
LO LO
0 0
LO LO m m CO CO CO CO r` r` rr n rn r, 00 Co
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
C 0f
Q '7 Q
0 -0 C a .0 C C) t 0
0 0 LL Q Q 0 0 LL Q � Q 0 0 LL Q

DMR Data NCO020389 Date: 10/31/08
Town of Benson WWTP pb:rdb
O NH3-N Weekly Avg ■ NH3-H Monthly Avg Weekly Max Limit Monthly Max Limit
14
--------------------------------- -------------------------------------
12
------------------------------------
-
10
------------------------------------------------------
--------
--
E8
------------------------------------------------------
---------
-
6
4
------------------------------------
-
2
-- - - - -- ---------- O
Q ---�--
0
LO
0
LO LO U') u') co co co co co co r` r` r` r`
0 0 0 0 0 0 0 0 0 0 0 0 0 0
r`
0
r
0
ao
0
ao
0
Q
Q O ❑ li Q Q' O 0 ri Q Q (D CDm
O
CD
�
0
0)Q
LL
L
O TP Rdg ■ TP Quarterly Avg Quarterly Max Limit
2.5
---------------------------- ---------------------------------------
2.0
O 00�
� 0 � O
8�
00
1.5-�
O O ---0. ----00 _O_ �- �0 0----------
---------------- -
0--------
O O O O O O00■ 0
---------
O O OO O O O� O O
O O Op�0
0.5
------ — -- 0---------------------------------
O
-
0.0
LO LO LO LO LO co co co to co co n r` r r`
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
r`
0
r`
0
co
0
ao
0
c CD 0 a c 0)0 M c 0)t
Q Q O ❑ ri Q � Q O 0 ri Q � Q
O
0
p
a
LL
Q
O TRC Rdg -Max Limit MDL
100
--------------------------- -------------------------
------
90
----------------------------
-----------
80
------------------------- -
----------
70
------------------------------------------------------------------
60
------------------------------- ----------------------------------
J
a� 50
Z
40
------------------------------------ ---------------------------
30
--------------------------------------------------------------
20
----------------------------Jl------------------------
--------
- O O
04Q----------------- --------------------
10
0
LO
0
LO LO LO LO co co co co co co r` r- r- r`
0 0 0 0 0 0 0 0 0 0 0 0 0 0
r
0
n
0
co
0
ao
0
Q
c or 0 . c M b .0 c M
� a O 0 ci Q � Q' O O ri Q � Q
O
b
p
�
ti
Q

DMR Data NCO020389 Date: 10/31/08
Town of Benson WWTP pb: rdb
OChromium Rdg
Daily
Max Limit 1022 ug/I
Weekly Averaae Max Limit
50ug/I
10
----------
----------------
-------------
9
-
-------------0-
---------
---
8
-
------------- -----------------
---------------
7
-
----------------
------------
-------------------
s--
-------------------------------
rn5--------------------
0--------
----------------------------
Z
4
----------------------------
3
2
-------
----------------
----------------
----------------
------
1
--------------------
---------------------------
------------
0
LO
0
LO
0
LO
0
LO
0
LO
0
co
0
co co co co co
0 0 0 0 0
0
0
0
0
0
rn
0
w
0
co
0
c
n
alt
Q
O
U
p
.fl
LL
L C c U
Q � Q O p
-0CL
LL
Q
c
-3
01
Q
O
U
p
L
L
CL
O Mercury Rdg 'Daily Max Limit
20
- -----------------
18---------------
-O
-------------
16 --
-----------------------------
------------
14
12
J
a 10
-----
a--A
------------------
o
O
s-------0------
O
---
-- ----------------------------------------
--
--
O
O
O
2-�
000
----�
---Qf- Q��O�O O
O
----
O
---------------
--
O
O
O 'm 0OW
0
LO
0
LO
0
LO
0
LO
0
LO
0
co
0
co co (0 co co
0 0 0 0 0
r`
0
r-
0
r-
0
n
0
rl-
0
r`
0
ao
0
ao
0
a
c
o)
a
0
0
0
-0
LL
c m 0
a � ¢ o o
�
LL
a
c
�
�
<
o
b
o
m
LL
a
♦ Iron Rdg
12000
-
--------------
--------------------------
---- -
----------------
10000
-----------
-
-------
8000
------------------
----------------------------------------------
J
a s000
a
4000
-
--------------------
2000
----------
------------
0
0
0
0 0
0
0
0
N
Z
�i

DMR Data NCO020389 Date: 10/31/08
pb:rdb
O Copper Rdg
45
----
40--------------------------
0---------------------------------------------
35
------------------------------------------------------------------
-
30
----------------------------------------------------------------------
25
----------------------------------------------------------------------
rn
Z 20
15
------�
o
------------------------------------------------------------
°
10
0-00--0--
------
---0---
O
- - 0---
_
4-0*0000OOOOOOoo00
5
- - - -Q00- -
000 -0 00 0000 0-00 -0 0000 40 -0P
AO - ---------------
0--
0
LO
0
LO
0
LO
0
LO LO
0 0
CD (D
0 0
(D W Co Co
0 0 0 0
r
0
t`
0
n
0
t`
0
t` (`
0 0
Co
0
Co
0
aa
o o
°aa
o o
a
n
<
o o
-
a-
O Nickel Rdg
Daily Max Limit 261 ug/I
Weekly
Average Max Limit 88
ug/I
25
- --
-
---
20-----------------
-
4 ---------------------------------------------------
15
---------------------0-------------------
----
---
y'
O O
10
---------------------
-----------------------------------------------
5
0
LO
0
LO
0
LO
0
LO LO
0 0
(D (D
0 0
(D (D CD CD
0 0 0 0
rl-
0
r-
0
r-
0
r
0
n r-
0 0
Co
0
00
0
Q
Q
O 0
ri Q
-1 Q O p
ri
Q
Q
0 tj
ri
CL
Q
O Zinc Rdg
90
--------------------
---------------------
---------------------------
O
70
60 O-O--—
----------0----0O---
--------------------------0
---------------
-O
----0--------
-0O-----00---
Q--
O
50
-----
-- 0O°CO°
-- -0----�-
0--0-C-O-0
----------
---------
Z40
000
-------
0-
°--------------0
C
-------------
4$ -0---------
O-
O
0---------------C
O
O O 0
0-----
O-O-----�
O-
30
----------
------------------------------
20
-----------------------------------------------------------------
--
10
------4-----------------------------------
------------
0
LO
0
LO
0
LO
0
LO LO
0 0
cD m
0 0
Co CO Co Co
0 0 o C
0
0
0
r`
0
n
0 0
0
0
00
0
a
c
nQ
M
o oC.)
m
rL a
< o ob
-0
LL
¢
r_
�
0)
a
b
o o
rL
Q

10/31/2008
Town of Benson rc
;NC0020389 �,`�
Prepared By;. RDB
IWC Calculations
Assume upstream TRC level = 0
Assume upstream Fecal level = 0.
Check Box if WTP Facility ❑
Enter Design Flow (MGD):
# ` 1.900 : :.rt _
Enter Upstream NH3-N Level (mg/L):
0,,20
Enter s7Q10(cfs):
00
Enter w7Q10 (cfs):
0.120 r
Total Residual Chlorine
Ammonia (NH3 as N)
Limit MAX
(summer)
35.0 mg/L
7Q10 (CFS)
0
7Q10 (CFS)
0
DESIGN FLOW (MGD)
1.9
DESIGN FLOW (MGD)
1.9
DESIGN FLOW (CFS)
2.945
DESIGN FLOW (CFS)
2.945
.
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (1
0
UPS BACKGROUND LEVEL (1
0.220
IWC (%)
100.00
IWC (%)
100.00
NON-POTW
Allowable Conc. (ug/1)
17
Allowable Conc. (mg/l)*
1.0
1.0
WEEKLY AVG LIMIT(mg/1)
3.0
5.0
Ammonia (NH3 as N)
(winter)
7Q10 (CFS)
0.12
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
1.9
(If DF >331; Monitor)
DESIGN FLOW (CFS) ,
2.945
(If DF <331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor, (DF)
1.00
UPS BACKGROUND LEVEL (1
0.220
IWC (%)
96.08
NON-POTW
Allowable Conc. (mg/I)*
1.9
1.9
WEEKLY AVG LIMIT (mg/1)
5.6
9.3
* MONTHLY AVG LIMIT
INPDES Servor/Current Versions/IWC
10/3112008

REASONABLE POTENTIAL ANALYSIS
Benson WWTP
NCO020389
Time Period October 2004 -April 2003
Qw (MGD) C9
WWTP Class IV
7Q10S (cfs) 0
/WC (%) @ 7010S 100
7010W (cis) 0.12
@ 7Q10W 96.065
30Q2 (cfs) 0.25
@ 30Q2 92.175
Avg. Stream Flow, QA (cis) 12
@ QA 19.706
Rec'ving Stream Hannah Creek
Stream Class C NSW
Outfal l 001
Qw = 1.9 MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC Wos/ /,FAV/
n pit H.Pred Cw Allowable Cw
(1)
Chronic Acute
Acute: N/A
P.retreabnent requirement
Arsenic
C
50
ug/L_
8 0 2.5
Note: n<12
_ _ _
Chronic 254
_,.§ _ __„',� __
AILelow detection limit
Limited data set
Noaction required; continue PPA;'HWA
Acute: N/A
Beryllium
C
6.5
ug/L.
3 0 0.5
Note: n<12
Chronic: 33
Only PPA values all belowldetechonlimit
Limited data set
Noaction required; continue PPA 3.
Acute: 15
All below detection limit
Cadmium
NC
2 15
ug/L
8 0 0.5
Noaction repuired, continge PPA,HWA
Note: n<12
Chronic 2
Only PPA values all below detection limit
limited data set
Noaction requi{ed, continue PPA,�HWA,
,.
Acute: 1.022
Predicted valuebelow acute h
Chromium
NC
50 1.022
ug/L
161 2
9.6
Reduce'to mouthy monitoring
_ _ __ __
Chronic 50
__
Predicted valuelbelow chronic
Reduce,to monthly monitoring ye
Acute: 7
Predicted value above acute; action level toxicant _
Copper
NC
7 AL 7.3
ug/L
78 17
64.4
_____
continue_2/Mohth monitoing __ _ _
'Chronic: 7
Predicted valueabove chronic action ,level toxicant
Continue 2/Month"monitoring`
Acute: 22
All'below detection limit," - --
Cyanide
NC
5 N 22
10
ug/L..
8 0 5.0
t
No action required contmue PPA, HW__A`
Note: n<12
Chronic: 5
_
Ail :below detection limit
Limited data set
Noaction required, continue PPA, HWA
Acute: NIA
Toluene
NC
11
ug/L
3 0 2.5
_ __ _
Note: n<12
_
Chronic::Wit 11
_ _
below--detect-on detection limit
Limited data set
Noaction,requi�ed, continue PPA`-'.' .'
Acute: 34
Alibelow detection limit
Lead
NC
25 N 33:6
ug/L
8 0 2.5
No` action,required, continue PP'A, HWA
Note: n<12
Chronic: 25
All belowsdetection limit
Limited data set
No lerequired, continue PPA, HWA°
Acute: N/A
Highest reported value 18.2ng/L above'chromc limit'
Mercury
NC
12
2.0000
ng/L
163 160
26.0260
Predicted value above chronic limit
_ _ __ __
Chronic: 12
Current dairy average limit
Change to weekty, average, imit = "
Acute: N/A
Pnetreatment requirement '- -
Molybdenum
NC
ug/L
5 4 153.5__
_
-777-
NC
Note: n<12
Chronic: N/A
_
Limited data set
Noaction required, continue HWA. ,2
Acute: 261
Predicted value: below acute,,. ,
Nickel
NC
88 261
ug/L
161. 7
23.0
Reduce to,monthly monitoring
------------------------------------------
Chronic: 88
Predicted.valuebelow chronic
Reduce to monthly monitoring
Acute:
Phenols
A
1 N
ug/L
3 0 1.0
Note: n<12
Chronic: 1
Only PPA values all below detection limit
Limited data set
No "aetion,.conttnuePPA.f
Acute: 56
AII',below ctectlonIWL,WQtoxtcant
Selenium
NC
5.0. 56
ug/L
8 0 5.0
Nodctwn ;continue PPA, H_WA
Note: n<12
_
Chronic: 5
_
All below detection limit
_
Limited data set
No action, continue PPA, H'W
Acute: 1
All below detection limitaction level toxcant
Silver
NC
0.06 AL 1.23
ug/L
8 0 2.5
Noaction contnuaPPA,`FiWA
Note: n<12
_ _ __
Chronic: 0.06
__
All below detection limitaction level toxicant
`
Limited data set
No ection,`eonOnue PPA,HWA=`- '•" t-`°f
Acute: 67
Prefctedvalue above acute.action leveitoxicant -�
Zinc
NC
50 AL 67
ug/L
78 78
102.0
Continue2lMonthmooit'oing
_ _
Chronic: 50
Predicted valueabove chronic action level toxicant
Continue ZlMonth'monitoring ,'
*Legend., "Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
rpa 20389, rpa
10/3112008

Low -flow characteristics for Hannah Creek near Benson ... Re: Need St...
Subject: Low -flow characteristics for Hannah Creek near Benson... Re: Need Stream Data
From: John C Weaver <[e-mail]>
Date: Tue, 21 Oct 2008 16:47:28 -0400
To: Ron Berry <Ron.Berry@ncmaiLnet>
CC: John C Weaver <[e-mail]>
Ron,
&UV1111_� WL)
In response to your inquiry about the low -flow characteristics for Hannah Creek near Benson in Johnston County, the following information is
provided:
A check of the low -flow files here at the USGS North Carolina Water Science Center indicates a previous determination of low -flow characteristics
for a location just downstream from your point of interest on Hannah Creek near Benson (station id 0208821675, drainage area 10.5 sgmi, 0.5 mile
upstream from SR 1171 also known as Hannah Creek Road). Completed in April 1987, the 7Q10, 30Q2, and winter 7Q10 were estimated at 0 cfs,
0.09 cfs, and 0.06 cfs, respectively, based on the flow characteristics at nearby partial -record sites on Black Creek near Four Oaks (station id
02088090, drainage area 79 sgmi).
Where no or insufficient data exists to allow a site -specific low -flow analysis for a point of interest, the low -flow characteristics are determined by
assessing a range of low -flow yields (expressed as flow per sqmi drainage area, or cfsm) at nearby locations where estimates have previously been
determined.
The "most recent" low -flow information published for this area is USGS Water -Resources Investigations Report 98-4135, "Low -flow characteristics
and discharge profiles for selected streams in the Neuse River basin, North Carolina" (Weaver, 1998). This report provides low -flow characteristics
(based on data through 1996) for USGS continuous- and partial -record sites in the Neuse River basin where sufficient data is available for analyses
However, the report does not provide statistical relations for estimating low -flow characteristics at ungaged locations.
There is no online version of the report available, but ordering information for the report is available at
http://pubs.er.usgs.gov/usgspubs/wri/wri984135.
Several points for considerations...
(1) In Table 7 of the above referenced report, there are several nearby partial -record sites in the Hannah Creek basin where records of
miscellaneous measurements have been previously particularly from the mid-1950's through mid-1970's. However, only one site on Hannah Creek
near Blackman (station id 02088240, drainage area 34.7 sgmi) had sufficient data for a low -flow analysis and publication of the annual 7Q10
discharge in the report. However, the 30Q2 and winter 7Q10 for this site were not published due to concerns about widely varying estimates noted
in the analyses. Based on the available data at this and the other nearby partial record site, there is enough evidence to support a 7Q10 of zero
flow for your point of interest on Hannah Creek.
(2) To determine a range for 30Q2 and winter 7Q10, the low -flow characteristics at four other partial records sites in the Neuse (02088090) and
adjacent Cape Fear (02106648, 02106681, and 02106760) in vicinity of the Hannah Creek basin that can be considered. Expressing these
estimates as low -flow yields (again, flow per square mile of drainage area, or cfsm) provides some indication of the yield that could potentially be
applicable to your location. The 30Q2 low -flow yields at these four nearby sites range from about 0.004 to 0.06 cfsm (average about 0.039 cfsm).
Similarly, the winter 7010 low -flow yields at these four nearby sites range from 0 to about 0.04 cfsm (average about 0.019 cfsm).
Applying the average of the above yields to the drainage area (10.5 sgmi) used in the previous request results in the 30Q2 and winter 7Q10 flow
estimates at about 0.4 cfs and 0.2 cfs, respectively. These updated estimates are about 4 times higher than those determined in the previous
estimates, but take into account the flow characteristics at four nearby sites as opposed to the 1 site used solely in the previous determination.
The difference in estimates further reinforces the concern about being able to estimate these statistics with any reasonable degree of confidence.
This is a situation where only the annual 7Q10 of zero flow can be provided with an acceptable degree of confidence and where additional data is
needed to further clarify the 30Q2 and winter 7Q10 estimates. Until such data were to become available, it is appropriate to state that the 30Q2 is
likely in the range from about 0.1 to 0.4 cfs and the winter 7Q10 is likely in the range from about 0.05 to 0.2 cfs.
(3) As for the average annual flow, yields for this statistic at the nearby partial -record sites range from 1.1 to 1.2 cfsm. Applying this range to the
drainage area (10.5 sgmi) results in average annual flow estimates between 11 and 13 cfs.
(4) As you consider the above information, please be aware of the following note. The above data are based on periods of record ending in the
1996 water year, well in advance of the drought conditions that have occurred since publication of the report. In some North Carolina basins, the
low -flow conditions observed during the 1998-2002 and current (2007-08) droughts have resulted in lower low -flow statistics. No formal statewide
investigation has been completed to document the changes in low -flow statistics since the drought. However, where updated analyses have been
completed for selected stations, the changes in pre -drought versus updated 7Q10 discharges have shown varying percentage changes of decline.
Hope this information is helpful.
Thank you.
Curtis Weaver
J. Curtis Weaver, Hydrologist, PE
USGS North Carolina Water Science Center
of 2 10/22/2008 7:35 AM

Low -flow characteristics for Hannah Creek near Benson... Re: Need St...
3916 Sunset Ridge Road
Raleigh, NC 27607
Telephone: [phone] // Fax: [phone]
E-mail address — [e-mail]
Intemet address — http://nc.water.usgs.gov/
Ron Berry <[e-mail]> To John Weaver <[e-mail]>
cc
10/16/2008 07:58 AM
Curtis,
I need the following data
Hannah Creek, Johnston County, point of interest Lat/Long
35"23121"N/78-30'30"W part of Neuse River Basin, USGS Benson NC
Need; Summer 7Q10 (cfs)
Winter 7Q10 (cfs)
30Q2 (cfs)
Average flow (cfs)
Thanks,
Ron Berry
NPDES Group
[phone]
Subject Need Stream Data
2 of 2 10/22/2008 7:35 AM

WDES/A uifer Protection Permitting Unit Pretreatment Information Request Form
PERM IT:IN RITER COMPLETES -THIS PART
_._ _ - w n� -'�
Date of Request 9/11/2008
Check all that
apply
PERMIT WRITERS -AFTER you net this form
back from PERCS:
- Notify PERCS if LTMP/STMP data we said should
be on DMRs is not really there, so we can get it for
you (or NOV POTW).
- Notify PERCS if you want us to keep a specific
POC in LTMP/STMP so you will have data for next
permit renewal.
- Email PERCS draft permit, fact sheet, RPA.
- Send PERCS paper copy of permit (w/o NPDES
boilerplate), cover letter, final fact sheet. Email RPA
if changes.
municipal renewal
X
Requestor
Ron Berry
new industries
Facility Name
Benson WWTP
WWTP expansion
Permit Number
NCO020389
Speculative limits
Region
Raleigh
stream reclass.
Basin Neuse River
stream relocation
7Q10 change
other
other
a check applicable
PERCS staff:
Other Comments to PERCS:
All data in BIMS is same as what is listed on DMR. You provided a NOV-
2003 STMP list of these additional pollutants not in the DMR report
As Cd CN Pb Mb Se Ag
CPF - TBA to Dana in mean time
CTB, CHO, LUM, NEU, ROA - Dana Folle 523
x
BIRD, FRB, NEU - Monit Hassan 371
HIW. LTN. TAR. YAD - Tom Ascenzo (526)
Status of Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program (list "DEW if program still under development)
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below STMP time frame: "
Most recent:
Flow, MGD Permitted Actual Time period for Actual Next Cycle:
Industrial
Uncontrollable n/a
.POC in
LTMP/
STMP
Parameter of
Concern (POC)
Check List
POC due to
NPDES/ Non-
Disch Permit
Limit
Required
by EPA*
Required
by 503
Sludge**
POC due,
to SIU***
POTW POC
(Explain
below)-"
STMP
Effluent
Freq
LTMP .
Effluent
Fre
,f
BOD
4
Q M
,f
TSS
4
Q M
,%
NH3
4
Q M
,j
Arsenic
4
Q M
�(
C
4
Q M
,f
Chramiurri ¢
Nf
4
Q M
If
Copper,g
,f
4
Q_ M
Cyanide
4
Q M
Lead E
,%
4
Q M
-,f
Mercury
4
Q M
Molybdenum
4
Q M
Nlckel ;a a w : _:?
,j
4
Q M
,j
Silver
4
Q M
,j
Selenium
4
Q M
Zinc-"",' ��
�� ��q < ..
. f
4
Q M
,[
Total. Nitrogen
4
Q M
,f
Phosphorus
4
Q M
4
Q M
4
Q M
4
Q M
4
Q M
Q = Quarterly
M = Monthly
all data on DMRs?
YES
(attach data)
data in spreadst
YES (email to writer)
NO
*A,weyin the LIMP
/STMP„ ** Only in LTMP/STMP if sludge land app or composte (dif POCs for incinerators)'
*** Only in LTMP/STMP while SIU still discharges to POTW **** Only in LTMP/STMP when pollutant is still of concern to POTW
)mments to Permit Writer (ex., explanation of any POCs: info you have on IU related investigations into NPDES problems):
NPD ES_Pretreatment. requ est.fonnjuly2007
Revised: July 24, 2007

Town of Benson
Head works Short Term Monitoring Plan (STMP)C7 3� I
A. Sampling Points (See FiguL re)
1. Influent -Regular composite sample taken prior to mixing with side
stream; as collected for NPDES monitoring.
2. Effluent -Regular composite sample after chlorination, as collected for
NPDES monitoring.
3. Oxidation Ditch — Collect a grab sample from each parallel oxidation
ditch unit at the same time. Then combine each grab using an amount
that is directly proportional to the volume of flow in its respective unit.
4. Sludge to Disposal -Grab sample of sludge wasted to Sludge Lagoon.
5. SIU's-Sampling as Per Industrial User Permit(s).
B. Pollutants of Concern (POCs) Reason for Inclusion:
NPDES-POTW NPDES Permit limit
Sludge-40 CFR 503 Sludge Land Application
EPA -EPA Required
IUP-Industrial User Permit Limit
SIU-Significant Industrial User
POC
List
NPDES
Required
Pollutants
Sludge
Required
Pollutants
EPA, NC
Required
Pollutants
SIU
Limited
Pollutants
Required
Detection
Levels
Flow
Flow
Flow
BOD5
BODs
BODs
2.0 m
TSS
TSS
TSS
2.0 m
NHL
NH3
0.1 m
TN
TN
Yearly lbs
As
As `
0.010 m
Cd
Cd
d
0.002 mg/L
Cr
Cr
Cr
0.005 m
Cu
Cu
Cu
0.002 m
CN
0.010 m
Pb
Pb
b
0.010 m
Hg
Hg
H
Mo
Mo
0.100 m
Ni
Ni
1
Ni
0.010 m
Ag
0.005 m
Se
Se
0.010 in
Zn17-n
Zn
0.010 mg/L
TP
TP
TP
0.05 m
% Solids
% Solids
Sludge to
disposal flow
Sludge to
disposal flow
,j,7/ oo)
co
File Name: AdshareHWA-ATBENSON_STMP REV2-PAGE 1 Page 1 o,ke 1's•
Last printed 11/20/03 1:35 PM —. ( I)
Modeled after: Chapter 4, Appendix 4-C (Revision Date: November 20, 2003 1Y) C.,r\ C..l
L4I����s

Town of Benson
Headworks Short Term Monitoring Plan (STMP) '�ry t 910 0
C. Flow
Influent flow will be monitored during sampling events. Flow or volume of
sludge to disposal (Pt. 3) can either be monitored or calculated.
D. SIU Monitoring ,
Significant Industrial User monitoring will be conducted per industrial user permit
(IUP)•
E. Sampling Frequency
Sampling Point
1 Year Before HWA
1- Influent
1 sample per quarter
2 - Effluent
Isample per quarter
3 - Oxidation Ditch
Once
4 - Sludge to Disposal
Per Sludge Permit and 503 regulations -
one sam le**
5 - SIU
Per SIU Permit
6 - Uncontrollable
Once ***
** Sample only wasted sludge (not sludge commingled with backwash wastewaters).
*** The. Pretreatment Unit recommends collection of one grab sample at an
uncontrollable location in the collection system, not containing SIU wastewater. Contact
the Pretreatment Unit for assistance in locating a representative location for
uncontrollable sampling.
File Name: AdshareV-IWA_AMENSON STMP REV2.doc Page 2
Printed: September 11, 2000, 5:21 PM
Modeled after: Chapter 4, Appendix 4-C (Revision Date: August 1,1994)

Town of Benson,
Head works Short Term Monitoring Plan (STMP)
F. Sampling Plan Locations
Uncontrollable
Pollutant
Influent
(Pt.1)
Effluent
(Pt.2)
Oxidation
Ditch
(Pt.3)
Sludge
(Pt.4)
SIU(s)
(Pt.5)
(Pt.6)
BOD5
X
X
As Per IUP
X
TSS
X
X
As Per IUP
X
NH3
X
X
X
As Per IUP
X
TN
X
X
As Per IUP
One Sample
X.,
Total P
X
X
As Per IUP
X
As
X
X
X
X
As Per IUP
X
Cd
X
X
X
X
As Per IUP
X
Cr
X
X
X
X
As Per IUP
X
Cu
X
X
X
X
As PerIUP
X
CN
X
X
X
As Per IUP
X
Pb
X
X
X
X
As Per 1UP
X
,'Hg
X
X
X
X
As Per IUP
X
Mb
X
X
X
X
As Per 1UP
X
Ni
X
X
X
X
As Per 1UP
X
Se
X
X
X
X
As Per IUP
X
Ag
X
X
X
As Per IUP
X
Zn
X
X
X
X
As Per IUP
X
Flow/Volume
X
X
X
X
As Per IUP
0/6 solids
X
As Per ]UP
AdshareHWA_ATBENSON_STMP_REV2-PAGE 3 Page 3 -
Last printed 11/20/03 1:35 PM
Modeled after: Champter 4, appendix 47C (Revision Date: November 20, 2003)

Pretreatment data effluent per phone interview with ORC
Aug-06
Nov-05
Feb-06
May-06
Aug-07
units
As
<5
<5
<5
<5
<5
Ng/I
Cd
<1
<1
<1
<1
<1
Ng/I
Cr
<5
<5
<5
<5
<5
Pg/I
Cu
13
< 10
13
13
13
Ng/I
Cyanide
< 5
< 5
< 5
< 5
< 5
pg/I
Hg
<0.2
<0.2
<0.2
<0.2
<0.2
pg/I
Pb
<5
<5
<5
<5
<5
pg/I
Mo
< 10
< 10
31
22
< 10
Ng/I
Ni
<10
<10
14
16
<10
Ng/I
Se
<10
<10
<10
<10
<10
Ng/I
Ag
<5
<5
<5
<5
<5
Ng/I
Zn
46
35
48
36
50
Ng/I

RE: FW: Benson WWTP NPDES Pernut Map Revision (Oct. 28, 2008)
V
Subject: RE: FW: Benson WWTP NPDES Permit Map Revision (Oct. 28, 2008)
From: "Randall Jones" <[e-mail]>
Date: Tue, 28 Oct 2008 08:43:48 -0400
To: "'Ron Berry"' <[e-mail]>
Mr. Berry,
I apologize; some of the information on that last map I sent you was
incorrect. The new map attached has the proper adjustments.
1. The alum ties into the splitter box between the clarifiers,.instead of
near the "Existing Pump Station."
2. The lime ties into the other splitter box as we discussed, but this time
I decided to update the map accordingly, new information came to my
attention to confirm this.
It should be noted that the lines in the ground may not be exactly like they
are in the drawing, but it should be close.
That should be everything, but again, if you have any questions, feel free.
Thanks,
J. Randall Jones, Jr. EI
The Wooten Company
301 West 14th Street
Greenville, NC 27834
252.757.1096 phone
252.757.3221 fax
252.714.4698 mobile
thewootencompany.com
-----Original Message -----
From: Ron Berry [mailto:Ron.BerryCncmail.net]
Sent: Monday, October 27, 2008 1:06 PM
To: Randall Jones
Subject: Re: FW: Benson WWTP NPDES Permit Map Revision (Oct. 2008)
Mr. Jones,
Thank you, this gives me the information I was looking for.
Ron Berry
NPDES Group
Randall Jones wrote:
Mr. Berry,
I realize that another map wasn't necessary, but I decided to go ahead and
update what I could anyway just for our records sake.
In regards to your questions: -
1. The Benson WWTP has a permanent standby generator located next to the
intermediate lift station beside the secondary clarifiers.
1 of 3 10/28/2008 9:32 AM

RE: FW: Benson WWTP NPDES Permit Map Revision (Oct. 28, 2008)
rd
2. The Influent Flow Meter is located at the flume and the Influent
Sampling point is just before the Screw Pumps. These locations have
been updated on the map.
3. As far as the Alum and the Lime, our schematics show the Alum feeding
into a point near the "Existing Pump Station."
Per a phone conversation with Martin Morris, the Lime connection point.
I is between the screw pumps and the central oxidation ditch. Our best I
guess is the splitter box you can see on the map, but I decided
against
Ichanging that spot on the map since I couldn't confirm how the line
was
in the ground.
Hope that's what you needed. If you have any other questions feel free to
email back or call the office.
Thanks,
J. Randall Jones, Jr. EI
The Wooten Company
301 West 14th Street
Greenville, NC 27834
252.757.1096 phone
252.757.3221 fax
252.714'.4698 mobile
thewootencompany.com
-----Original Message -----
From: Ron Berry [mailto:[e-mail]]
Sent: Thursday, October 23, 2008 4:53 PM.
To: Randall Jones
Subject: Re: FW: Benson WWTP NPDES Permit Map Revision (Oct. 2008)
Mr. Jones,
I have one additional questions is there any power back up? Typically we
require back up for LTV systems.
Thanks again,
Ron Berry
Randall Jones wrote:
Mr. Berry,
Attached is a pdf of the new WWTP map with revisions we discussed on
Oct. 16-th .
Items discussed:
2 of 3 10/28/2008 9:32 AM

RF: FW: Benson WWTP NPDES Pennit Map Revision (Oct. 28, 2008)
1. Where are the influent and effluent meters located, or where are the
monitoring locations in general?
2. Identify the new structures on Oxidation Ditches 1 and 3.
3. Confirm that only one basin is used for Sludge, and one is used for
Equalization.
If you have any further questions or concerns, please feel free to call
the office at [phone].
Thanks,
* J. Randall Jones, Jr. EI*
The Wooten Company
301 West 14th Street
Greenville, NC 27834
252.757.1096 phone
252.757.3221 fax
252.714.4698 mobile
thewootencompany.com _
FLOWBALANCE (Revised Oct. 28, 2008).pdf li Content -Type: application/pdf
Content -Encoding: base64
3 of 3 10/28/2008 9:32 AM

Re: FW: Benson WWTP NPDES Permit Map Revision (Oct. 2008)
Subject: Re: FW: Benson WWTP NPDES Permit Map Revision (Oct. 2008)
From: Ron Berry <[e-mail]>
Date: Thu, 23 Oct 2008 16:53:28 -0400
To: Randall Jones <[e-mail]>
Mr. Jones,
I have one additional questions is there any power back up? Typically we require back
up for UV systems.
Thanks again,
Ron Berry
Randall Jones wrote:
Mr. Berry,
Attached is a pdf of the new WWTP map with revisions we discussed on Oct. 16Ath .
Items discussed:
1. Where are the influent and effluent meters located, or where are the
monitoring locations in general?
2. Identify the new structures on Oxidation Ditches 1 and 3.
3. Confirm that only one basin is used for Sludge, and one is used for
Equalization.
If you have any further questions or concerns, please feel free to call the office
at [phone].
Thanks,
* J. Randall Jones, Jr. EI*
The Wooten Company
301 West 14th Street
Greenville, NC 27834
252.757.1096 phone
252.757.3221 fax
252.714.4698 mobile
_thewootencompany.com
10/23/2008 4:53 PM

Re: FW: Benson WWTP NPDES Pernut Map Revision (Oct. 2008)
r •,
Subject: Re: FW: Benson WWTP NPDES Permit Map Revision (Oct. 2008)
From: Ron Berry <[e-mail]>
Date: Thu, 23 Oct 2008 16:22:48 -0400
To: Randall Jones <[e-mail]>
Mr. Jones,
I appreciate your timely reply and the drawing is very helpful, but I still need a
few more details.
1)Where is the influent sample station located?
2)Where will the "lime" be added in the process?
3)Where will the "alum" be added in the process?
You do not need to send another drawing just indicate the location of three items and
I will mark the drawing accordingly.
Thank you,
Ron Berry
NPDES Group
Randall Jones wrote:
Mr. Berry,
Attached is a pdf of the new WWTP map with revisions we discussed on Oct. 16Ath .
Items discussed:
1. Where are the influent and effluent meters located, or where are the
monitoring locations in general?
2. Identify the new structures on Oxidation Ditches 1 and 3.
3. Confirm that only one basin is used for Sludge, and one is used for
Equalization.
If you have any further questions or concerns, please feel free to call the office
at [phone].
Thanks,
* J. Randall Jones, Jr. EI*
The Wooten Company
301 West 14th Street
Greenville, NC 27834
252.757.1096 phone
252.757.3221 fax
252.714.4698 mobile
_thewootencompany.com
1 of 2 10/23/2008 4:28 PM

PRELIMINARY DESIGN
1
R194W NEW STRUCTURE r
J•
BN@
� UPGRADE TO EXISTING ,• �•„_,�
1.97 FLOW BALANCE NUMBER ,•'• _ _ 2.18 --
J•a 41$ 1
®r••�e. ^O� / I BUILDING
/ STORAGE
0.02
ems•• BURRING
z
STATION
I
110
•`�+sa OtO� / M M
0 36 I of 0T38 I } N
24I I Q - �CO2R I 1 11
1.40
a � . 4• 0
•` f m NEW S
•4 I I I SPUTTER
O
IIOX No 2
NEW
CLARIFIER M PC
No6
coTAx
o I IMECHAl & ,: •..
w� BAR SCREEN
GRIT CHAMBE
�i IIr f
MARCH 31, 2005 a,
TOWN OF BENSON i Ii 0.02 — —
NORTH CAROLINA
i DIVERSION
BOX
VW TP EXPANSION 9
-PRELIMINARY DESIGN!
TR
THE WOOTEN COMPANY
ENGINEERING I PLANNING I ARCHITECTURE
120 North Boylan Avenue Raleigh NC 27603-1423
919.828.0531 tax 919.834.3589
I�
�I
1.95 I
PARSHALL
FLUME ri
EFFLUENT METER
OXIDATION DITCH NO.3
OXIDATION DITCH NO.2
OXIDATION DRCM NO.. I
RECLAIMED WATER
PUMP STATION
DECHLORINATION
0
TAE RAMON
1.97 20• GRAVITY OUTFALL —
k
'TAND EFFLUENT SAMPLING STATION
t STORAGE TANK
— ^
�I/
ASPHALT ROAD
MIXERS BRUSH AERATOR
o
�I
qz
OXIDATION DITCH INTERCONNECTION PIPE
CO
OXIDATION DITCH INTERCONNECTION PIPE
Lj
•� � INFLUENT FLOW METER
L00-25— — ,,,�ghslN RETURN
I.
EQUALIZATION BASIN - I
I�
BRUSHAERATOR
ASPHALT ROAD
SLUDGEAFRATION BASIN
SCHEMATIC OF EXPANDED
BENSON WASTEWATER TREATMENT FACILITY (1.97 MGD)
LOWBALANCE (Revised Oct. 2008).dan 1
8:26:44

PHONE CALL LOG
Randall Jones, Wooten Co.
Phone: [phone]
Date: 10/16/08 Time: 11:15 AM
Renewal NPDES: NC0020389
Town of Benson WWTP
Discussed March 31, 2005 flow schematic for 1.97 flow inserted in renewal application submitted by
Wooten Co. for Permittee. Made following observations and requested information:
1) The flow balance number 1.97 MGD does not match the approved expansion discharge of 1.9
MGD (monthly average). Technically if the plant discharges 1.97 MGD this would be rounded
to 2.0 MGD. This is cited for informational purposes only to the consultant since this is a flow
balance for the schematic. The renewal application states design 1.9 MGD.
2) Is there an effluent meter if yes where is it located physically on the schematic.
3) The schematic shows a flow exiting the grit chamber, going to the equalization pond, and then
returning back to the screw pump area, in essence bypassing the effluent meter. This may not be
important if an effluent meter is providing the reported flow to the state. See 4) for more
comments.
4) The Permittee is required to collect composite samples at both the influent and effluent streams
to allow compliance calculation of 85% removal. Typically this is done adjacent or in concert
with the influent meter for the influent sample. Have same problem as cited in 3) potentially
bypassing influent sampling. However, not shown on schematic. Please indicate physical
location of both the influent and effluent composite samplers. Note: Not discussed but may need
to check, the influent meter provides the proportional signal to the composite sampler.
5) The oxidation ditch 1 & 3 both show symbols for new structures, what are the structures?
6) The schematic indicates the two existing lagoons are dedicated to specific activities. One pond
for equalization, one pond for sludge storage. Please confirm.
Mr. Jones was going to obtain the missing information and if warranted provide updated flow
schematics. I provide Mr. Jones the DWQ mailing address, my direct dial phone, and my email
address.

October 26, 2007
THE
W 0 OT E N Mrs. Frances Candelaria
NC Department of Environment and Natural Resources
COMPANY Division of Water Quality
Permit and Engineering Unit
E N G I N E E R I N G 1617 Mail Service Center
PLANNING
Raleigh, NC 27699-1617
I
ARCH ITECTUR E Re: NPDES Permit Renewal (NC0020389)
Town of Benson, NC
301 West 14th Street
Greenville NC 27834
252.757.1096
fax [phone]
Dear Mrs. Candelaria:
Attached is the information necessary for the Town of Benson to renew NPDES
Permit # NC0020389. The following attachments include the NPDES Forms 1 &
2A, a topographic map of the area, a process flow diagram, a sludge management
plan, written authorization from the Town, as well as the results from priority
pollutant analyses and toxicity testing.
It should be noted that the Town of Benson is aware of the new application
requirements for permit renewal; however, the Town did not receive notice of the
toxicity testing requirements until a letter arrived from the NCDENR Division of
Water Quality dated June 8, 2007. The Town is providing four toxicity tests for
Ceriodaphnia Dubia and one test for Pimephales Promelas. The Town tested for
organisms other than Ceriodaphnia Dubia after they received the memorandum.
The Wooten Company is the Town of Benson's authorized representative in
preparing the NPDES permit renewal package. If you have any questions please
feel free to contact our office at (252)-757-1096.
Best regards,
The Wooten Company
By: �. �.
andall Jones, E.I.
OCT 3 1 2007'
l

MAYOR
William W. Massengill, Jr.
MAYOR PRO•TEM
Frederick D. Nelson, Jr., Pro -Tern
COMMISSIONERS
John R. Bonner
Will T. Chandler
Douglas V. Oglesby
Ray G. Smith
Cassandra P. Stack
May 6, 2008
TOWN OF BENSON
P.O. BOX 69
303 EAST CHURCH STREET
BENSON, NORTH CAROLINA
Mr. Michael E. Templeton, P.E.
Point Source Branch/NPDES Permits
Surface Water Protection Section
NCDENR_DWQ
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Dear Mr. Templeton:
27504
[phone]
FAX [phone]
TOWN MANAGER
Keith R. Langdon
TowN CLERK
Connie M. Sorrell
FINANCE DIRECTOR
Donna M. Honeycutt
TOWN ATTORNEY
James D. (Jim) Johnson, Jr.
HIV �...., ..kg_..
IFM A Y 8 20 88 L r
DEPa�( h"'ITFR QUALITY— P'
Town of Benson hereby request that the nitrogen limit in the town's NPDES permits be reduced
by 360 lbs as measured at the estuary which equals to 720 lbs as measured at point of discharge
in Johnston County.
We feel this reduction of nitrogen limit will not have an adverse effect in the town meeting its
nitrogen limit as required by the state of North Carolina and thereby request changing our
NPDES permit nitrogen limit.
Should you have any questions please contact me at [phone] or email me at
klan don c townofbenson.com
Since ly,
eith R. Langdorijbwn Manager

N
FMAY g
20%
BILL OF SALE DENR Ww-
_._____..�PLth;r c�URC
THIS BILL OF SALE is executed and delivered as of April 2, 2008 by the Town of
Benson, a body politic and corporate organized under the laws of the State of North
Carolina (referred to herein as TOWN), in favor of Johnston County, a body politic and
corporate organized under the laws of the State of North Carolina (the COUNTY).
Introductory Statement
The COUNTY and TOWN are parties to that certain Agreement of Purchase and Sale
dated April 2, 2008 (the "APS"), pursuant to which TOWN agrees to sell, convey and
transfer certain nitrogen poundage to the COUNTY, as that term is defined ("Poundage")
and more fully described in the APS.
NOW THEREFORE, for and in consideration of one dollars ($1.00) and other good and
valuable consideration, the receipt and sufficiency of which are hereby acknowledged:
Conveyance. TOWN hereby sells transfers, conveys, assigns and delivers to the
COUNTY THE poundage free and clear of all liabilities, obligations, liens,
security interests and encumbrances whatsoever
2. Further Assurance. TOWN will, from time to time after the delivery of this
Bill Of Sale, at the request of the COUNTY, but at no cost to TOWN, promptly
take such further action and execute and deliver such additional assignments,
bills of sale, consents or other similar instruments as the COUNTY may
reasonably deem necessary and deliver to TOWN to complete the transfer of the
title or possession of the Poundage to or vest it in the COUNTY.
3. Successors and Assigns. The provisions of this Bill of Sale are binding upon
TOWN, its successors and assigns and are for the benefit of the COUNTY, its
successors and assigns, and all rights hereby granted to the COUNTY may be
exercised by the COUNTY, its successors or assigns.
TOWN hereby executes and delivers this Bill of Sale as of the date first above written.
TOWN OF BENSON
By:�{lt a
William Massengill, Mayo

f
FMAY 8 2008
.�
AGREEMENT OF PURCHASE AND SALE . 7 j
THIS AGREEMENT OF PURCHASE AND SALE ("Agreement") is made and entered into �-
as of the Effective Date set forth on the signature page of this Agreement, by and between
JOHNSTON COUNTY, a body politic and corporate organized under and virtue of the laws of the
State of North Carolina ("Purchaser") and the TOWN OF BENSON, a body politic and corporate
("Seller").
RECITALS
A. Seller is the owner of a certain annual mass loading limit for total nitrogen ("TN
Allocation") according to the Neuse River Basin Nutrient Sensitive Waters Management Strategy:
Wastewater Discharge Requirements adopted by the North Carolina Environmental Management
Commission ("EMC") in 15A NCAC 2B.0234.
B. Seller desires to sell 360 pounds (as measured at the Estuary) of said TN Allocation
(Seller's "Offered TN Allocation"). The 360 pounds as measured at the Estuary is equal to 720 lbs
as measured at the point of discharge in Johnston County.
C. Purchaser has determined that it is in the best interests of its rate payers to acquire the
Offered TN Allocation offered for sale by Seller to facilitate the future expansion of its waste water
flow. Seller has determined that it no longer has a need for that portion of the Offered TN
Allocation it has offered to sell and that it is in its best interest to sell the same.
NOW, THEREFORE, for and in consideration of the foregoing recitals, the mutual
promises and covenants contained herein, and the earnest money referred to below, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:
ARTICLE I: PURCHASE OF PORTION OF SELLER'S TN ALLOCATION
1.1. Purchase of Portion of Seller's TN Allocation. Seller hereby agrees to sell and
Purchaser agrees to purchase Seller's Offered TN Allocation, together with all Seller's rights to and
uses for said Seller's Offered TN Allocation.
ARTICLE II: PURCHASE PRICE
2.1 Purchase Price. The Purchase Price ("Purchase Price") of the Seller's Offered TN
Allocation shall be ONE HUNDRED SEVENTY-SIX THOUSAND EIGHT HUNDRED AND
N0/100 ($176,800.00) DOLLARS.
2.2 Reduction in Seller's Allocation. The Purchase Price is based upon the Seller being
able to transfer to Purchaser at closing an allocation amount of 360 lbs/yr of TN at the Estuary in
compliance with the requirements set out in this Agreement. In the event Seller is unable for any
reason to transfer an allocation of 360 lbs/yr of TN at the Estuary, Purchaser shall have the right, in
1

its sole discretion, to terminate this agreement or proceed with the purchase of such lesser number of
lbs/yr as Seller is then able to transfer at a Purchase Price to be calculated based on FOUR
HUNDRED NINETY ONE and 11/100 ($491.11) DOLLARS per "estuary" pound, which Purchase
Price shall be paid in cash at closing as set forth hereinbelow.
ARTICLE III: CLOSING DATE
3.1. Closing. The closing of the purchase shalt occur within seven (7) calendar days
following receipt from DENR pursuant to 15A NCAC 2H.0107(c) of a draft permit and/or other
written communication indicating that DENR has determined to issue the revised NPDES Permit
to the Purchaser including the above -described 360 lbs/yr of TN allocation at the Estuary (the
"Regulatory Approval"). In no event shall the Seller be obligated to close if the Regulatory Approval
is not obtained by Purchaser and the transaction completed on or before December 31, 2008.
3.2 pnMent of Purchase Price. Parties hereby acknowledge that the Town of Benson is
indebted to Johnston County in the amount of One Hundred Seventy -Six Thousand Eight Hundred
and No/100 ($176,800.00); And upon transfer of the TN Allocation to Purchasers, both parties agree
that this debt is paid in full.
3.3 Bill of Sale and Additional Documentation. Seller shall deliver to Purchaser at
Closing a Bill of Sale and the parties shall also execute and deliver at Closing any other documents
reasonably identified by Purchaser or Seller as necessary or appropriate to complete and evidence
the transaction contemplated hereby.
ARTICLE IV: CONDITIONS PRECEDENT
The obligations and liabilities of the Parties hereunder shall be in all respects conditioned
upon satisfaction of each of the following conditions precedent, the failure of any of which, unless
waived by such Party, shall entitle that Party, in addition to its other rights and remedies provided in
this Agreement, if any, to terminate this Agreement by written notification given to the other Party
on or before the Closing Date. Upon such termination due to failure of Seller to. be able -to complete
the transaction, Purchaser shall be entitled to return of the Earnest Money then being held by Seller.
Termination by Seller due to Purchaser's default (including, but not limited to failure to close on or
before December 31, 2008 other than due to conditions or circumstances set forth in Section 4.1)
shall entitle Seller to retain the Earnest Money as liquidated damages.
4.1 As To Purchaser.
a. Authorizations and Approvals. The Purchaser shall have obtained the Regulatory Approval
and Purchaser shall have obtained assurances to its reasonable satisfaction that Seller has the
requisite legal authority to complete the transaction contemplated herein.
b. Change in Laws. There shall have been no change in statutes or regulations and no
administrative or legal decision or opinion by any court or any administrative agency materially
2

affecting Purchaser's ability to acquire, hold, and use Seller's Offered TN Allocation for the
purposes described herein, or affecting Seller's ability to transfer Seller's Offered TN Allocation.
C. Accuracy of Representations and Warranties. All representations and warranties made by
Seller in this Agreement shall be true and accurate in all material respects.
4.2 As To Seller
a. Authorizations and Approvals. The Seller shall be satisfied as to the content and scope of
Purchaser's Regulatory Approval and that Purchaser has the requisite legal authority to complete the
transaction contemplated herein.
b. No Change in Seller's TN Allocation. At the contemplated time for closing,. if the Offered
TN Allocation Seller is able to sell and convey is less than 360 lbs/yr at the Estuary, or Seller is
otherwise prevented from completing this transaction as contemplated, Seller, in its sole discretion,
may terminate the transaction or if authorized by applicable governmental authority, close the
purchase as described in Paragraph 2.2 herein.
C. Change in Laws. There shall have been no change in statutes or regulations and no
administrative or legal decision or opinion by any court or any administrative agency materially
affecting Seller's ability to sell the Offered TN Allocation for the purposes described herein, or
affecting Seller's ability to transfer Seller's Offered TN Allocation.
d. _Accuracy of Representations and Warranties. All representations and warranties made by
Purchaser in this Agreement shall be true and accurate in all material respects.
e. Seller shall have received approvals satisfactory to it that its lenders have consented to and
authorized the transaction and its completion as herein contemplated.
ARTICLE V: REPRESENTATIONS AND WARRANTIES OF PURCHASER
To induce Seller to enter into this Agreement and to sell the Property as herein provided,
Purchaser hereby makes the representations and warranties set forth in this Section, upon each of
which Purchaser acknowledges and agrees that Seller is entitled to rely and has relied.
5.1 Authori . This Agreement has been duly executed and delivered by Purchaser,
constitutes the valid and binding agreement of Purchaser and is enforceable in accordance with its
terms.
5.2 No Default — Laws or Other Ageements. The execution and delivery of and the
performance by Purchaser of its obligations hereunder do not and will not contravene, or constitute a
default under, any provisions of applicable law or regulation, or any agreement, judgment,
injunction, order, decree or other instrument binding upon Purchaser or result in the creation of any
lien or other encumbrance on any asset of Purchaser.

ARTICLE VI: SELLER'S COVENANTS
6.1 Cogperation With Purchaser. Seller shall cooperate with and assist, and shall take no
action that might impede, Purchaser in obtaining the Legal Authorizations and Regulatory
Approvals, provided that Seller shall not be obligated to incur any expense in doing so.
6.2 Maintenance of TN Allocation. Seller shall use commercially reasonable efforts to
maintain and avoid loss of any of Seller's Offered TN Allocation, and shall take no action that might
reduce its value. In the event Seller becomes aware of any action or event that potentially may cause
loss, totally or partially, of Offered TN Allocation, Seller shall promptly notify Purchaser of such
action or event.
ARTICLE VII: PURCHASER'S COVENANTS
7.1 Governmental Approvals. Purchaser shall submit its request to modify its NPDES
Permit to DENR as soon as possible after the Effective Date, but in no event later than November
15, 2008 in order to obtain the Regulatory Approval and shall use its best efforts to obtain its Legal
Authorization on or before December 15, 2008. The failure of DENR to issue the Regulatory
Approval described in Paragraph 3.1 on or before December 31, 2008 shall not constitute an event of
default for either party, but shall afford either party the ability to elect to terminate this Agreement
under Article IV hereof as an unsatisfied Condition Precedent.
ARTICLE VM: MISCELLANEOUS
8.1 Entire Agreement. This Agreement constitutes the entire agreement between the
parties hereto and it is understood and agreed that all undertakings, negotiations, representations,
promises, inducements and agreement heretofore entered into between these parties are superseded
hereby. This Agreement may not be changed orally, but only by an agreement in writing signed by
both Purchaser and Seller.
8.2 Waiver. No waiver of any of the provisions to this Agreement shall be valid unless
in writing and signed by the party against whom it is sought to be enforced.
8.3 Assiment and Succession. The provisions of this Agreement shall inure to the
benefit of and be binding,upon the parties hereto and their respective heirs, personal representatives,
successors and assigns. Closing shall not terminate the obligations of the parties that are by their
terms intended to survive closing.
8.4 Severability. If any article, section, phrase or portion of this Agreement is, for any
reason, held or adjudged to be invalid, illegal or unenforceable by any court of competent
jurisdiction, such article, section, phrase, or portion so adjudged will be deemed separate, severable
and independent and the remainder of this Agreement will be and remain in full force and effect and
will not be invalidated or rendered illegal or unenforceable or otherwise affected by such
adjudication, provided the basic purpose of this Agreement and the benefits to the Parties are not
substantially impaired.
4

8.5 Governing Law. The provisions of this Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of North Carolina.
8.6 Counterparts. This Agreement may be executed in any number of counterparts, each
of which shall be deemed an original and all of which taken together shall constitute one and the
same instrument.
8.7 No Third Party Beneficiaries. The provisions of this Agreement pursuant hereto
shall not impart rights enforceable by any person or entity not a Party or not a permitted successor or
assignee of a Parry bound to this Agreement and shall not create, or be interpreted as creating, any
standard of care, duty or liability to any person not a Party hereto.
IN WITNESS WHEREOF, the parties have caused this Agreement to become effective as of
the date of signing by the last parry to execute this Agreement, as indicated by the dates appearing
next to the signatures below, the Effective Date.
Wi ss:
Dater , 2008
AP ri I
SELLER:
TOWN OF ENSON Witness:
BY: = 2
eit Langdon
Date: February J, 2008
5

l
NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
(This form is best filled out on computer, rather than hard copy. Then unprotect to
highlight in light blue as needed to make your comments more visible in the final printing.)
[But DON'T protect document again, or Word wipes out all you have entered.]
Date: County:
To: NPDES Discharge Permitting Unit Permitee: Town oMenson VFW
Ann. NPDES Reviewer: &111011101ft Application/ Permit No.h&00020
Staff Report Prepared By:Mitch-HamA
Project Name:
SOC Priority Project? (Y/N) _ If Yes, SOC No.
A. GENERAL INFORMATION
1. This application is (check all that apply): ❑ New ® Renewal
❑ Modification ! �
JA,,,i 1 7 2�.: �.C8 �j
2. Was a site visit conducted in order to prepare this report? ® Yes or ❑ No.
a. Date of site visit: December 13, 2007
b. Person contacted and telephone number: Martin A. Morris 919.894.2373
c. Site visit conducted by: Mitch Hayes
d. Inspection Report Attached: ® Yes or ❑ No.
3. Keeping BIMS Accurate: Is the following BIMS information (a. through e. below) correct?
❑ Yes or ® No. If No, please either indicate that it is correct on the current application or the
existing permit or provide the details. If none can be supplied, please explain:
Discharge Point: (Fill this section only if BIMS or Application Info is incorrect or missiniz)
(If there is more than one discharge pipe, put the others on the last page of this form.)
a. Location OK on Existing PermitEl OR, if not, is so-- tAST PF�.0 • mow" OK on Application ❑, or if neither is right, provide Location:
b. Driving Directions OK on Existing Permit ®, OR, if not, is
OK on Application ❑, or provide Driving Directions (please be accurate):
c. USGS Quadrangle Map name and number OK on Existing Permit ❑, OR, if not, is
OK on Application ❑, or provide USGS Quadrangle Map name and number: Benson, NC 1997,
F 24 NE �� R
d. Latitude/Longitude OK on Existing Permit ®, (check at http://www.topozone.com These are
often inaccurate) or is OK on Application ❑, or provide Latitude: Longitude:
e. Receiving Stream OK on Existing Permit ®, OR, if not, is
OK on Application ❑, or provide Receiving Stream or affected waters:
a. Stream Classification: N-NSW
b. River Basin and Sub basin No.: 030404
c. Describe receiving stream features and downstream uses: Hannah Creek at the discharge
point has swamp -like characteristics, low flowing water, water dark in appearance due to high

NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
organic contact, swamp vegetation. Hannah Creek flows through land that is mostly used for
agriculture, eventually merging with Mill Creek. Mill Creek flows into the Neuse River
approxinately five miles upstream of Quaker Neck Lake at Goldsboro. t
For NEW FACILITIES Proceed to Section C, Evaluation and Recommendations
(For renewals or modifications continue to section B)
B. DESCRIPTION OF FACILITIES AND WASTES) (renewals and modifications only)
1. Describe the existing treatment facility: The 1.9 MGD wastewater treatment facility consists of the
following units: 2 concrete lined equalization basins, a 3 MG concrete lined aerated sludge basin with 3
floating aerators, arc bar (mechanical bar screen), grit chamber, 2 manual bar screens, influent Parshall
flume, ultrasonic flow meter, 3 screw pumps, 3 oxidation ditches (1 used for nutrient removal), 4
secondary clarifiers (2 @ 10' depth, 2 @ 11' depth), 5 deep bed tertiary filters, dual chlorine contact
chamber, sodium metabisulfite dechlorination contact chamber, post aeration tank, effluent flow meter
with ultrasonic sensor using a 2-feet rectangular weir with end contractions, an effluent reuse system
providing irrigation to three athletic fields at the South Johnston County High School. Upgrade to
increase the wastewater permitted capacity to 1.97 MGD has begun. Items noted during the inspection
included the following: Construction of a new 14 feet sidewall depth, 15 feet in diameter secondary
clarifier, mixed liquor effluent collection box and a new flow splitter box downstream of the existing
oxidation ditches were under way; Sidewalls for the influent structure, grit chamber, mechanical bar
screen, and diversion box have been raised above the 100-year flood plain. The existing secondary
clarifiers and the oxidation ditches sidewalls will be raised in 2008; The existing 4-7.5 hp brush rotor
drives in oxidation ditches # 1 and #3 will be replaced with 4-15 hp drives. Oxidation ditches # 1 and
#3 will also contain one new 15 hp rotor each with new brushes. All three -filter lift pumps will be
upgraded and expanded to 30 hp each rated at 2300 gpm; Two existing screw pumps will be replaced
with two new 5 hp 1,750 gpm screw pumps; a new 30" D.I. parallel effluent outfall line has been
installed and is in use. The new outfall line is 5 feet offset from the existing 21" effluent outfall line and
a new yard hydrant and water meter for the reclaim water irrigation system has been installed. When in
operation, the effluent reclaim water spray irrigation system will apply up to 1.97 MG per year on the
1.65 acres of land beside the oxidation ditch number 3.
2. Are there appropriately certified ORCs for the facilities? ® Yes or ❑ No.
Operator in Charge: Martin A. Morris Certificate # WW-4 16875 (Available in BIMS or
Certification Website)
Back- Operator in Charge: Steve A. Procter Certificate # WW-4 26527
FORM: NPDES-RRO 06/03, 9/03, 1/07 2

' NPDES -REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
3. Does the facility have operational or compliance problems? Please comment:, There are no operational
or compliance problems.
Summarize your BFMS review of monitoring data (Notice(s) of violation within the last .permit cycle;
Current enforcement action(s)): For the period 11/01/2003 through 10/31/2007 there has been one
enforcement action LV-2005-0330 for exceeding monthly BOD average limit. One NOV was sent for
exceeding weekly Mercury .average limit NOV-2006-LV-0535. There are,currently no enforcement
actions.
Are they currently under SOC, ❑ Currently under;JOC, ❑ Currently under moratorium ❑? Have
all compliance dates/conditions in the existing permit, SOC, JOG, etc. been complied. with? ❑ Yes
or ❑ No. If no, please explain:
4. Residuals Treatment: PSRP ® .(Process to Significantly Reduce Pathogens, Class. B) or
PFRP ❑ (Process to Further Reduce Pathogens, .Class A)?
Are they liquid or dewatered to a cake?
Land Applied? Yes Z No ❑ If so, list Non -Discharge Permit No. WQ0012514 expired 08/31/2004
Contractor Used: Last contractor used was Atlantic
Coast Contracting, Inc.
Landfilled? Yes ❑ No® If yes, where?,
Other?
Adequate Digester Capacity? Yes ;❑ No ❑ Sludge Storage Capacity? Yes ® No ❑
Please comment on current operational practices: Waste sludge is discharged to the existing 3 MGD
aerated basin for storage and long term sludge stablization. Sludge is allowed to settle in the basin and
the supernatant is withdrawn which is pumped back into the headworks. Currently, the Town of
Benson is negotiating a contract to Atlantic Dewatering to dewater and haul sludge to McGill
Environmental for composting. Sludge was last removed from the 3 MGD basin in 2002. During that
period the Town of Benson solicite bids for the removal and disposal of sludge. The contract was
awarded to the lowest bidder which also was. repsonsible for obtaining all land. application permits.
The Town of Benson Land Application Permit WQ0012514 expired 08/31/2004.
5.. Are there any issues related to compliance/enforcement that should be resolved .before issuing this
permit? ❑ Yes ,or ® No. If yes, please explain:
C. E VAL UA TION AND RECOMMENDATIONS
L Alternative Analysis Evaluation: has the facility evaluated the non -discharge options available? Give
"regional perspective for each option evaluated:
Spray Irrigation::
FORM: NPDES-RRO 06/03, 9/03, 1/07 3

10
NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
Connect to Regional Sewer System:
Subsurface:
Other Disposal Options: The Town of Benson operates a 26,720 GPD reclaimed water generation facility
at the Town of Benson WWTP which consists of a 23,240 GPD utlization facility located at South
Johnston High School with connection to a 7.1 acre spray irrigation field and a 3,480 GPD utilization
facility located at the WWTP consisting of a spray irrigation system onto 1.56 acreas beside oxidation
basin number 3. Both utilization facilities are covered under permit WQ22501.
2. Provide any additional narrative regarding your review of the application: Topo map that is provided
in application is outdated. Please use attached topo map included in this report. Schematic of
expanded WWTP facility (1.97 MGD) included in permit application shows only one equalization
basain. There are two concrete lined equalization basins and one aerated sludge basin.
3. List any items that you would like NPDES Unit to obtain through an additional information
request. Make sure that you provide a reason for each item:
Recommended Additional Information
Reason
-tzWo K A P
U 1 IJ ©T
4. List specific Permit requirements that you recommend to be removed from the permit when
issued. Make sure that you provide a reason for each condition:
Recommended Removal Reason
5. List specific special requirements or compliance schedules that you recommend to be included in
the permit when issued. Make sure that you provide a reason for each special condition:
Recommended Addition Reason
6. Recommendation: ❑ Hold, pending receipt and review of additional information by regional office;
❑ Hold, pending review and approval of required additional information by NPDES permitting
office; ® Issue; ❑ Deny. If deny, please state reasons:
L-;;P- -<t'TT ti� r w---
FORM: NPDES-RRO 06/03, 9/03, 1/07 4

NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
Reminder: attach inspection report if Yes was checked for 2 d.
7. Signature of report preparer: � Lo
Signature of WQS regional supervisor:
Date:
D. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
There is a new 30" ductile iron effluent discharge outfall line that is in use. The new outfall line is 5
feet offset from the existing 2 1 " effluent outfall line The line was constructed to accomadate the extra
flow from the plant increase to 1.97 MGD. The opening for the new line in the post aeration tank is
set higher than the existing opening for the 21" effluent outfa111ine.The new outfall line does not need
to be considered as a new outfall with monitoring and limit requirements.
/itl��c��Es 14 -VPd PAO
®5
�J
E 7JA1 7 2008 ? y
VP
FORM: NPDES-RRO 06/03, 9/03, 1/07 5

TopoZone - USGS Benson (NC) Topo Map
http://www.topozone.com/print.asp?lat=35.38919&lon=-78.50825 &s...
1of1
topozone
M1,
�pylighl :fi*:J.31dip� � e �I16 l^C � { - ; � • � -' t,
J65
C..,� \%\
NI
F �A� • .:, — — — — — —
INTERCI nhc_328 Ic—
D push I
\ 1 ly I '19fri
T}Wir .. L a� 1L I. raCein
41
em
�6' jig
�I ' f����'�J� I •"f ' �� �•{� I
r�L
fi, 1l 111 i.f T:a��:sl• i�X _
I8 �~
�.` � � '+. ,� ,•".--� . � 1 , e In � > ,,sue 1' ' � �
L .
^ I AiJ i
l yI
0 0.3 0.6 0.9 1.2 1.5 km G
0 0.2 0.4 0.6 0.8 1 mi
350 23' 21"N, 780 30' 30"W (NAD27)
USGS Benson (NC) Quadrangle M=-8.80 7
Projection is UTM Zone 17 NAD83 Datum G=1.444
/997
� n n c,,h C"-e e- �� -7 S _ 6 . C ( S w 1/10/2008 5:13 PM

THE
WOOTEN
COMPANY
ENGINEERING
PLANNING
A R C H I T E C T U R E
301 West 14th Street
Greenville NC 27834
252.757.1096
fax [phone]
October 26, 2007
Mrs. Frances Candelaria
NC Department of Environment and Natural Resources
Division of Water Quality
Permit and Engineering Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: NPDES Permit Renewal (NC0020389)
Town of Benson, NC
Dear Mrs. Candelaria:
Attached is the information necessary for the Town of Benson to renew NPDES
Permit # NC0020389. The following attachments include the NPDES Forms 1 &
2A, a topographic map of the area, a process flow diagram, a sludge management
plan, written authorization from the Town, as well as the results from priority
pollutant analyses and toxicity testing.
It should be noted that the Town of Benson is aware of the new application
requirements for permit renewal; however, the Town did not receive notice of the
toxicity testing requirements until a letter arrived from the NCDENR Division of
Water Quality dated June 8, 2007. The Town is providing four toxicity tests for
Ceriodaphnia Dubia and one test for Pimephales Promelas. The Town tested for
organisms other than Ceriodaphnia Dubia after they received the memorandum.
The Wooten Company is the Town of Benson's authorized representative in
preparing the NPDES permit renewal package. If you have any questions please
feel free to contact our office at (252)-757-1096.
Best regards,
The Wooten Company
By:Gi
andall Jones, E.I.

PRELIMINARY DESIGN
NEW STRUCTURE �✓
UPGRADE TO EXISTING '
✓•' M M Ii M
97 FLOW BALANCE NUMBER ✓ '" ,_2.,a — —
✓•• ��
CONTROL
BUILDING
IV
✓` Vf-mm.RA.-
✓ �f
LL
0_02 msTIN O
PUMPIN 13
•1l f / STATION
' f
036 I al 0U6� I{N
24 I I 14R 0 2R I 1 I
6s 0�
2•
I
1,40 C
tfll 3. HEN, 6s
II 6 sPLnRER
'1 BOX No 2
•'� � � I I C I IER
NEW ally
CLARIFlER m
Nos 3� ILL
•sti COMM
SC%& P
GRIT CHAMBE
MARCH 31, 2005
TOWN OF BENSON
NORTH CAROLINA
WW TP EXPANSION
PRELIMINARY DESIGN
THE WOOTEN COMPANY
ENGINEERING I PLANNING I ARCHITECTURE
120 North Boylan Avenue Raleigh NC27603-1423
919.828.0531 fax[phone]
LO.02
DIIVXERSION\ N
0 II
Ort36 � � CN� 7
INFLUENT
METER
1.95 I I
I—
PARSKAL.L
FLUME
EFFLUENT METER
RECLAIMED WATER
PUMP STATION
CHLOijkNE N , DECHLORINATION
cRAVITYOUTF— — — — — — — — — — — — — — —
NAND EFFLUENT S4MPUNO STATION 0
2STORAOETANK
ASPHALT ROAD I �'
I
IE
I;
I�
I�
I
MU(ERS � BRUSH AERATOR
OXIDATION DITCH NO.3
►— 111' O
r
0
OXIDATION DITCH INTERCONNECTION PIPE . (2
t�
II� 14
wm ills
� 1 161
OXIDATION DITCH INTERCONNECTION PIPE
OXIDATION DITCH NO.1 J
INFLUENT SAMPLING STATION
II
L0._25_ _ — _ _IN RETURN — _ _ — _ —,
---------------�\
EQUALIZATION BASIN 7r
BRUSH AERATOR
ASPHALT ROAD
SLUDGE AERATION BASIN
SCHEMATIC OF EXPANDED
BENSON WASTEWATER TREATMENT FACILITY (1.97 MGD)
III
■ N
71 OWRAI ANCF (Revised Oct_ 20n81_rinn 10/27/2008 11:57:24

w
Sludge Management Plan
Benson Wastewater Treatment Plant
NPDES Permit No. NC0020389
Non -Discharge Permit No. WQ0012514
The Town of Benson operates a 1.9 mgd modified biological nutrient removal (BNR) plant
which discharges its effluent into Hannah Creek in the Neuse River Basin under NPDES Permit
No. NC0020389. Waste sludge from the modified BNR plant is discharged to the existing
3,247,000 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 [503.33(b)(9)], or Option 10 [503.33(b)(10)].

• , Mayor
Jerry B. \icl-amh
OCT 9 2007
('omndseioners � �
Frederick D. \elwn. Jr.I
\\'iil r. Chandler --
.lack It. t itticton
Gmiridra P Stack
William W. \LLNsengill, Jr.
Ray t i. Smith
October 3, 2007
'row I of Denson
Post I jfiee 13ux 69
303 East Church ,Street
Benson, .Vorth Carolina TU04
[phone]
Fax [phone]
is-%wA(m n4Pfhenson.c(om
North Carolina DENR
Division of Water Quality
Permit and Engineering Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: NPDES Permit Town of Benson Renewal Package
To Whom It May Concern:
runn .\lanager
Keith R. I.an 61fl
I'own Clark
Connie %I. Sonxll
Finance Officer
D,,nna M. f loncecutt
1'unn .1 thirnev
James 1) 1 Jim) Johns n. Ir.
This letter is to inform you that The Wooten Company is the Town of Benson's Authorized
Representative in preparing the Town of Benson's permit renewal package.
I certify under penalty of Law that this document and all attachments were prepared under my
direction or supervision in accordance with system designed to assure that qualified personnel
properly gather and evaluate the information submitted and based on my inquiry of the persons
who manage the system, or those persons directly responsible for gathering the information. The
information submitted is the best of my knowledge and belief to be, true, accurate, and complete.
I am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations.
If you should need any additional information, please contact me at [phone] or email me
at lclanadon(i4townotbenson.co m.
Sin rely,
eit R. Ler
Town Man