NC0083551_Permit Issuance_20171208

N
a
Water Resources
ENVIRONMENTAL QUALITY
December 8, 2017
Mr. Jeffrey L. Hudson, Executive Director
Onslow Water and Sewer Authority
228 Georgetown Road
Jacksonville, NC 28540
ROY COOPER
Governor
MICHAEL S. REGAN
Sec etmr
LINDA CULPEPPER
Interim Director
Subject: NPDES PERMIT ISSUANCE
NPDES Permit NCO083551
Dixon WTP
Class PC -I
Onslow County
Dear Mr. Hudson:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached final 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).
The final permit includes the following significant changes from the existing permit:
➢ Section A. (5) has been added to require electronic submission of effluent data, and a footnote
has been added in Section A. (1). Federal regulations require electronic submittal of all
discharge monitoring reports (DMRs).
➢ Regulatory citations have been added to the permit.
➢ Outfall map has been updated.
➢ The expiration month has been changed from June to November to allow a full 5-year permit
cycle.
➢ The city and address have been updated on the cover sheet and Supplement to Permit Cover
Sheet per the renewal application.
➢ Language has been updated and a component list has been added on the Supplement to Permit
Cover Sheet based on current NPDES permit formatting and information provided by Mr. David
Mohr.
➢ The language "After construction of new water treatment facilities, discharge reverse osmosis
reject wastewater through the existing wastewater treatment apparatus and outfall" has been
removed from the Supplement to Permit Cover Sheet, as the reverse osmosis system is currently
in use.
➢ Weekly instantaneous flow monitoring has been removed from Section A. (1) as the facility is
now required to perform continuous recording monitoring.
➢ Parameter codes in Section A. (1) have been updated for Total Phosphorus, Total Nitrogen, and
Total Suspended Solids.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, NC 27699-1617
919 807 6333 919-807-6389 FAX
https://deq.nc.govlabouVdivisionstwater-resourceslwater-resources-permitslwastewater-branchlnpdes-wastewater-permits

Mr. Jeffrey L. Hudson
NC0083551 Issued Permit
s
➢ Monitoring for temperature has been removed as this is no longer required per the current water
treatment plant strategy.
➢ Monitoring for Total Iron has been removed as there are no longer water quality standards and
the application stated iron sulfate and ferrous sulfate do not have the potential to be discharged.
➢ Monitoring for Total Fluoride has been removed as there is no water quality standard for fluoride
in saltwater.
➢ Monitoring for salinity, conductivity, total dissolved solids, and total suspended solids has been
changed from grab sampling to composite sampling based on the current water treatment plant
strategy.
➢ Monitoring for turbidity has been changed from monthly to 2/month per on the current water
treatment plant strategy.
➢ Limits have been added for Total Zinc and Total Arsenic based on a reasonable potential to
exceed water quality standards.
➢ Monitoring for Total Residual Chlorine and Ammonia Nitrogen have been added as the renewal
application indicated that there was a potential for chlorine to be discharged and per the current
water treatment plant strategy.
➢ The aquatic toxicity language in Section A. (2) has been updated.
➢ Section A. (4) has been added requiring a discharge alternatives evaluation be performed due to a
history of failed toxicity tests.
The final permit includes the following significant changes from the draft permit:
➢ A compliance schedule has been added fora composite sampling method to be determined for
instream salinity and conductivity monitoring.
➢ Instream monitoring frequency for pH has been reduced to monthly per the current water
treatment plant strategy.
Please note that the receiving stream is listed as an impaired waterbody on the North Carolina 303(d)
Impaired Waters List. Addressing impaired waters is a high priority with the Division, and instream
data will continue to be evaluated. If there is noncompliance with permitted effluent limits and stream
impairment can be attributed to your facility, then mitigative measures may be required.
Whole Effluent Toxicity test results submitted during the past three years have demonstrated that the
Water Treatment Plant's effluent is showing potential for causing aquatic toxicity in the receiving
stream. As a result, the Onslow Water and Sewer Authority shall perform a Discharge Alternatives
Evaluation as described in Section A. (4) of this permit. This evaluation is being requested to determine
whether there are any economical and technologically feasible alternatives available to the Onslow
Water and Sewer Authority to comply with all NC Water Quality Standards. The permittee will be given
approximately one permit cycle to evaluate and document possible treatment/discharge alternatives to
eliminate aquatic toxicity. The evaluation shall be submitted with the permittee's next permit renewal
application and will be carefully reviewed by the Division and the results will be used in the
development of a compliance schedule or possible variance request for the Onslow Water and Sewer
Authority.
Mr. James McDonnel of the Onslow Water and Sewer Authority requested clarification of the draft
permit on whether a composite sampler in the stream would be needed to collect upstream and
downstream data for salinity and conductivity. After review of the current water treatment plant

Mr. Jeffrey L. Hudson
NCO083551 Issued Permit
strategy, instream sampling for salinity and conductivity will remain as composite sampling. A two
month compliance schedule has been added to this permit in Section A. (1) to provide the permittee time
to install a composite sampler or have another method approved by the Wilmington Regional Office.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such
demand is made, this permit 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 any other Federal, State, or Local governmental permit that may be required.
If you have any questions or need additional information, please do not hesitate to contact Brianna
Young of my staff at [phone].
Sin ely,
Linda Culpepper
Interim Director, Division of Water Resources
cc: NPDES Files
Central files
Wilmington Regional Office
ec: David Mohr, P.E., ONWASA [[e-mail]]
Edward Caron, ONWASA [[e-mail]]
James McDonnel, ONWASA [e-mail]]
WSS/Aquatic Toxicology Branch

Permit NCO083551
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELEMIINATION SYSTEM
PDES
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Onslow Water and Sewer Authority
is hereby authorized to discharge wastewater from a facility located at the
Dixon WTP
6661 Wilmington Highway
Holly Ridge
Onslow County
to receiving waters designated as an unnamed tributary to Stones Creek in the White Oak River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II,
III and IV hereof.
This permit shall become effective January 1, 2018.
This permit and authorization to discharge shall expire at midnight on November 30, 2022.
Signed this day December 8, 2017.
k�wida Culpepper .......
Interim Director, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9

Permit NCO083551
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
permit conditions, requirements, terms, and provisions included herein.
Onslow Water and Sewer Authority
is hereby authorized to:
1. Continue to operate a water treatment plant with a discharge of greensand filter and ion exchange
backwash, and reverse osmosis reject wastewater. This water treatment plant currently has a design
potable flowrate of 4 MGD and a maximum, monthly average wastewater discharge of 0.347 MGD.
This facility is located at 6661 Wilmington Highway in Holly Ridge in Onslow County. Water and
wastewater treatment consists of:
• Nine (9) greensand filters
• Six (6) ion exchange softeners
• Three (3) 1MG reverse osmosis skids with thirty (30) membrane vessels per skid
• Three (3) 915,000 gallon settling basins
2. Discharge from said treatment works at the location specified on the attached map into an unnamed
tributary to Stones Creek [Stream Segment 19-30-3], currently classified SA-HQW, PNA waters
[HUC: 0302030202] in the White Oak River Basin.
Page 2 of 9

Permit NCO083551
Part I.
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored'
by the Permi(ee as specified below:
EFFLUENT CHARACTERISTICS
(Parameter Codes)
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Fre uenc
Sample Type
Sample
Location2
Flow (50050)
Continuous
Recording
E
Salim 00480
Monthly
Composite 3
E, U, D
Conductivity 00094
Monthly
Composite 3
E U, D
Total Dissolved Solids 0295
Monthly
Composite
E
Dissolved Oxygen 00300
Monthly
Grab
E, U, D
H 00400
6.8 s.0 s H
s 8.5 s.u.
2/Month
Grab
E
H 00400
Monthly
Grab
U, D
Total Residual Chlorine a 50060
13 /L
2/Month
Grab
E
Total Suspended Solids CO530
10.0 m /L
15.0 m /L
2/Month
Composite
E
Turbidity 00070
21Month
Grab
E
Total Arsenic 01002
5 /L
34.5 /L
Monthly
Grab
E
Total Chloride 00940
Monthly
Composite
E
Total Manganese 01055
Monthly
Composite
E
Total Zinc 01092
42.8 /L
47.6 /L
Monthly
Composite
E
Total Copper 01042
Quarterly
Composite
E
Total Lead 01051
Quarterly
Composite
E
Total Nitrogen CO600
Quarterly
Composite
E
Total Phosphorus CO665
Quarterly
Composite
E
Ammonia Nilrogen 6 C0610
Monthly
Composite
E
Whole Effluent Toxicity TGE3E
Monitoring6 (
Monitor & Re Port
Quarter) y
Composite
Po
E
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR
application system [see A. (4)].
2. E = Effluent; U = Upstream at least 100 feet upstream from the outfall; D = Downstream at least 100 feet
downstream from the outfall.
3. A composite sampler must be installed within 2 months of the date of permit issuance, or another method
must be approved by the Wilmington Regional Office Water Quality Regional Operations Section in
accordance with 15A NCAC 02B .0503 (4).
4. Limit and monitor only if the facility adds chlorine or chlorine derivatives to water that is eventually
discharged. The Division shall consider all effluent TRC values reported below 50 µg/L to be in
compliance with the permit. However, the Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall below
50 µg/L.
Page 3 of 9

Permit NCO083551
5. Ammonia Nitrogen should be monitored if the Permittee uses chloramines (adds ammonia to chlorinated
water) for secondary disinfection prior to backwashing.
6. Acute Toxicity 24-hr Pass/fail Monitoring: January, April, July, and October. Permittee shall use mysid
shrimp as the test organism unless another organism of equal or greater sensitivity is deemed more
appropriate based on the characteristics of the discharge and receiving stream. See Special condition A.
(2) for details.
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) ACUTE TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[15A NCAC 02B .0500 et seq.]
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A
Single Effluent Concentration" (Revised -December 2010 or subsequent versions). The monitoring shall
be performed as a Mysid Shrimp (Mysidopsis bahia) 24 hour static test. The effluent concentration at
which there may be at no time significant acute mortality is 90% (defined as treatment two in the
procedure document). The tests will be performed during the months of January, April, July, and
October. These months signify the first month of each three month toxicity testing quarter assigned to
the facility. Effluent sampling for this testing must be obtained during representative effluent discharge
and shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code
TGE3E. Additionally, DWR Form AT-2 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water 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 and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. 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
Water Sciences Section at the address cited above.
Page 4 of 9

Permit NCO083551
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from either these monitoring requirements or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival 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.
USE OF A DIFFERENT TEST ORGANISM
The permittee may request the use of a different test organism upon documentation that the alternate test
organism would provide an equal or greater level of protection and is appropriate based on the
characteristics of the discharge and receiving stream. Such documentation would consist of one of the
following:
1. For saltwater classified streams, a fathead minnow may be assigned as the acute testing species if
the salinity of the receiving stream at the point of discharge is <5 ppt throughout the tidally
influenced cycle. This determination may be based on the best professional judgment of DWQ
staff or data collection provided by the permittee and approved by DWQ staff. This evaluation
should include vertical profiles of salinity/conductivity measurements at both high tide and low
tide over several 24 hr cycles.
2. Three consecutive "side -by -side" tests with results indicating that the alternate test organism is as
or more sensitive to the facility's effluent. Each test series would consist of two separate toxicity
tests conducted on the same sample of effluent with the length of exposure specified by the permit,
the only difference between the tests being the organism used.
3. An alternate plan developed by the permittee and approved by the Aquatic Toxicology Unit that
demonstrates an equal level of protection is offered by the test organism.
For items 2 and 3, it must also be demonstrated that viable and standardized culture techniques are
available for that organism and standardized testing methodologies have been developed and
validated. This demonstration should meet guidance provided by EPA in Section 6 of EPA-821-R-02-
012, Short Term Methods for Estimating the Acute Toxicity of Effluents and Receiving Waters to
Freshwater Organisms. Fifth Edition, 2002. Requests to use a different test organism and supporting
documentation should be sent to NC DWQ, ESS at the address listed above.
A. (3.) PERMIT RE -OPENER: WHOLE EFFLUENT TOXICITY MONITORING
[G.S. 143-215.1(b)]
Whole Effluent Toxicity monitoring results indicating aquatic toxicity failure may result in the Division
of Water Resources re -opening this permit to add a limit for Whole Effluent Toxicity, or requesting by
letter that further action be taken to address toxicity failures. Mitigative actions include additional
testing and/or toxicity identification/reduction evaluations to determine the cause(s) of the effluent
toxicity and measures required to achieve passing effluent toxicity results.
Page 5 of 9

Permit NCO083551
A. (4.) DISCHARGE ALTERNATIVES EVALUATION
The Permittee shall assess potential alternatives to eliminate Whole Effluent Toxicity (WET) test
failures. This evaluation shall assess the feasibility of all the following alternatives.
1. Connect discharge to a WWTP: Determine whether the wastewater can be discharged to a
wastewater treatment plant. Approval or disapproval from the plant operator
should be acquired.
2.Obtain a Non -discharge permit: Eliminate the surface water discharge by obtaining a non -
discharge permit for spray irrigation, infiltration, or subsurface disposal (on -site
drainfield, infiltration gallery, injection wells).
3. Install Wastewater Treatment: Install improved wastewater treatment to enable the facility
effluent to consistently pass the WET test. If this is not technically feasible or
cost prohibitive, please explain and provide estimated costs.
4. Use Alternative Water Treatment Source: Obtain drinking water from another source (nearest
County, City, or Town or other wells) so the discharge or toxicity problem is
eliminated.
5. Use Alternative Water Treatment Method: Install alternative and/or innovative water treatment
methods or operational improvements that do not produce toxic wastewaters.
For example, install a recycle iron/manganese filtration system with no
discharge or combine discharge with WWTP or cooling water effluents.
6. Discharge to a Larger waterbody/Perform a dilution model: Relocate the facility's discharge to
a larger receiving waterbody to eliminate or reduce toxic impacts to the
receiving waterbody given the increased dilution. If applicable, perform a
dilution model to receive allowance for stream dilution in WET test.
7. Combination of Alternatives: Employ any combination of the alternatives listed above that would
result in eliminating or decreasing toxicity until a more feasible solution
becomes available.
The evaluation shall include a present value of costs analysis for all technologically feasible options as
outlined in the Division's "Engineering Alternatives Analysis Guidance Document." This Document can
be found at: http://t)ortal.ncdenr.org/web/wq/swp/ps/npdes/permits.
This evaluation is being requested to determine whether there are any economical and technologically
feasible alternatives available to the Permittee to address aquatic toxicity in the plant effluent. Based
upon the evaluation, please identify viable alternatives and present an implementation schedule and
project timeline for the preferred alternative. The Permittee shall submit the Discharge Alternatives
Evaluation to the Division along with the submission of their next permit renewal application (due 6
months prior to permit expiration on November 30, 2022) to:
NC DENR / Division of Water Resources / Water Quality Permitting
NPDES, Wastewater Branch
1617 Mail Service Center, Raleigh, NC 27699-1617
Page 6 of 9

Permit NCO083551
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December
21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
t
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)]
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring
data and submit DMRs electronically using the internet. Until such time that the state's eDMR
application is compliant with EPA's Cross -Media Electronic Reporting Regulation (CROMERR),
permittees will be required to submit all discharge monitoring data to the state electronically using
eDMR and will be required to complete the eDMR submission by printing, signing, and submitting one
signed original and a copy of the computer printed eDMR to the following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband access,
then a temporary waiver from the NPDES electronic reporting requirements may be granted and
discharge monitoring data may be submitted on paper DMR forms (MR 1, 1. 1, 2, 3) or alternative forms
approved by the Director. Duplicate signed copies shall be submitted to the mailing address above. See
"How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 7 of 9

Permit NC0083551
Sewer Overflow/Bypass Event Reports;
Pretreatment Program Annual Reports; and
Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.410)(9), the permittee must identify the initial recipient at the time of
each electronic submission. The permittee should use the EPA's website resources to identify the initial
recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity for
receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each
type of electronic submission and for each state. Instructions on how to access and use the appropriate
electronic reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting
Rule is found at: https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-
pollutant-discharge-elimination-system-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty (60) days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports. The duration of a temporary waiver
shall not exceed 5 years and shall thereupon expire. At such time, monitoring data and reports shall be
submitted electronically to the Division unless the permittee re -applies for and is granted a new
temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit monitoring data
and reports on paper to the Division for the period that the approved reporting waiver request is
effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
bgp://dgg.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)]
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section
B. (I 1.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting
purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account
and login credentials to access the eDMR system. For more information on North Carolina's eDMR
Page 8of9

Permit NC0083551
system, registering for eDMR and obtaining an eDMR user account, please visit the following web
page:
ho://dgg.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
7 certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or persons
who manage the system, or those persons directly responsible for gathering the information, the
information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am
aware that there are significant penalties for submitting false information, including the possibility of
fines and imprisonment for knowing violations. "
5. Records Retention (Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41 ].
Page of

Young, Brianna A
From:
Sent:
To:
Potts, J
Monday, October 16, 2017 9:27 AM
Young, Brianna A
Subject: RE: Draft NPDES permits
Hi Brianna,
We have no comments for the following:
Rodanthe/Waves/Salvo RO WTP (NC0083909)
Dixon WTP (NC0083551)
Bogue Banks WTP (NC0083089)
Thanks for the opportunity to review.
J. D. Potts
Manager, Recreational Water Quality Program
Shellfish Sanitation and Recreational Water Quality
Division of Marine Fisheries
Department of Environmental Quality
[phone] office
[phone] fax
i.d.00ttsCa ncdenr.00v
PO Box 769
5285 Hwy 70 West
Morehead City, NC 28557
¢ -" Nothing Compares
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Young, Brianna A
Sent: Tuesday, October 03, 2017 6:12 PM
To: Potts, J <[e-mail]>; Ethridge, Mark <[e-mail]>
Subject: Draft NPDES permit for Bogue Banks WTP (NC0083089) out to public notice
Good afternoon,
Please find attached the draft permit for Bogue Banks WTP (NC0083089) that is being submitted to public notice this
week. Please provide any comments by November 31.

Thank you,
Brianna Young
Environmental Senior Specialist
Division of Water Resources
N.C. Department of Environmental Quality
Office: 919-807-6333
Brianna.You ng(a)ncdenr.gov
Mailing address:
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties.

169993 Affidavit of Publication
15483130 Jacksonville Daily News
Page 1 of 2 Jacksonville, NC
Personally appeared before me, a Notary Public of the County of Onslow, State of North Carolina, on this the 12th day of
October, 2017
of The Daily News, who being duly sworn, states that the advertisement entitled PERMIT RENEWAL NCO083551 a true copy of
which is printed herewith, appeared in The Daily News, a newspaper published in the City of Jacksonville, NC, County of Onslow,
State of North Carolina, 1 da n the following dates:
October 12, 2017''
NORTH CAROLINA
ONSLOW COUNTY
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 Management Commission proposes to issue a NPDES wastewater discharge permit
to the person(s) listed below. Written comments regarding the proposed permit will be accepted until 30 days after the
publish date of this notice. The Director of the NC Division of Water Resources (DWR) may hold a public hearing should
there be a significant degree of public interest. Please mail comments and/or information requests to DWR at the above
address. Interested persons may visit the DWR at 512 N. Salisbury Street, Raleigh, NC to review information on file.
Additional information on NPDES permits and this notice may be found on our website:
http://deq. nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater/public
-notices,or) 807-6397.
Onslow Water and Sewer Authority requested renewal of permit NCO083551 for the Dixon WTP in Onslow County; this
permitted discharge is treated WTP process wastewater to an unnamed tributary to Stones Creek in the White Oak
River Basin.
October 12, 2017 (adv)

169993
15483130
Page 2 of 2
Affidavit of Publication
Jacksonville Daily News
Jacksonville, NC
Subscribed and sworn to this 12th day of October, 2017
rotary Public
r` � •GOMcnissioQ •.
N
OTA m NRY
01 p08LIG
ZN`�Us1 5'�{y �C?

Table 1
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
Data Source(s)
Saltwater RPA 95% Probablity/95% Confidence
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
t Information Table 2. Parameters of Concern
❑+ CHECK IF HQW OR ORW WQS
Dixon WTP
PC-1
NCO083551
001
0.347
UT to Stones Creep
SA, HOW - PNA
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
Tidal, IWC = 100%
aarrwarer srreams are ncat resumng in as twc 7. = iuuv.
If an approved model is conducted then a chronic dilution
factor is determined and can be applied to a discharge to
calculate its IWC %. If a stream is classified as a SA or
ORW then its is also classified as a HQW. The appropriate
IWC % must be defined to properly calculate WQS-based
limits.
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Perlis
Palos
Par10
Parl1
Par12
Par13
Par14
Pan 5
Par16
Parl7
Paris
Paris
Par20
Par21
Par22
Name wos Type Chronic Wither Acute PQL Units
Arsenic
Aquatic Lae
C
36
SW
69
ug/L
Arsenic
Human Health
C
10
HH
ug/L
Cadmium
Aquatic Life
NC
8.9
SW
40.2
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
10
ug/L
Chromium
Aquatic Life
NC
50.4
SW
1107.8
ug/L
Chromium, Total
Aquatic Life
NC
N/A
SW
N/A
ug/L
Copper
Aquatic Life
NC
3.7
SW
5.8
ug/L
Cyanide
Aquatic Life
NC
1
SW
1
10
ug/L
Lead
Aquatic Life
NC
8.5
SW
220.8
ug/L
Mercury
Aquatic Life
NC
25
SW
0.5
ng/L
Molybdenum
Human Health
NC
2.0
HH
mg/L
Nickel
Aquatic Life
NC
8.3
SW
74.7
ug/L
Selenium
Aquatic Life
NC
71
SW
ug/L
Silver
Aquatic Life
NC
0.1
SW
2.2
ug/L
Zinc
Aquatic Life
NC
85.6
SW
95.1
ug/L
NOTE: The aquatic life chronic and acute WOS for several metals are calculated based on EPA conversi
see "Diss. SW stds. As TM" for more details and summary of calculated WOS..
NCO083551 updated SALTWATER RPA w_diss factors 20167a,input
6/20/2017

REASONABLE POTENTIAL ANALYSIS - DATA
Anionic
Mn.: In— "
PoT
u =58
Data
Data
BDL=120L
Results
1
11/7/2012
<
10
5
Std Dev.
0.9439
1
2
12/S12012
<
10
5
Mean
5.1273
2
3
122073
<
10
5
C.V.
0.1841
3
4
2/62M13
10
5
n
55
4
5
3/62013
<
10
5
5
6
4/2/2073
12
12
Mull Factor =
1.0100
6
7
5/82013
<
10
5
Max. Value
12.0 ug(L
7
8
6IW2013
10
5
Max. Pmd Ow
12.1 ug/L
8
9
7/9/2013
10
5
9
10
8/7/2013
<
10
5
10
11
9/4/2013
10
5
11
12
1QWM13
<
10
5
12
13
111S 013
<
10
5
13
14
12/42013
<
10
5
14
15
10/2014
10
5
15
16
2/5/2014
10
5
16
17
3/5/2014
10
5
17
18
4/8/2014
10
5
18
19
57/2014
<
10
5
19
20
6/4/2014
<
10
5
20
21
7/8/2014
<
10
5
21
22
8/6/2014
<
10
5
22
23
9/3/2014
<
10
5
23
24
10/7/2014
<
10
5
24
25
11/5/2014
<
10
5
25
26
12I3/2014
<
10
5
26
27
1/7/2015
<
10
5
27
28
2/4/2015
<
10
5
28
29
W412015
<
10
5
29
30
4/72015
<
10
5
30
31
5/6/2015
10
5
31
32
602015
<
10
5
32
33
7/8/2015
<
10
5
33
34
8/5/2015
<
10
5
34
35
9/2/2015
<
10
5
35
36
10/142015
<
10
5
36
37
11/182015
<
10
5
37
38
1222015
<
10
5
38
39
116=16
<
10
5
39
40
213=16
10
5
40
41
32=16
10
5
41
42
3/14/2016
<
10
5
42
43
4/62016
<
10
5
43
99
SM12018
<
10
5
44
45
6112016
<
10
5
45
46
7/6/2016
<
10
5
46
47
8/3/2016
<
10
5
47
48
9/72018
10
5
48
49
10/42016
<
10
5
49
50
11=16
<
10
5
50
51
12/72016
<
10
5
51
52
1/102017
<
10
5
52
53
2/12017
<
10
5
53
54
3f12017
10
5
54
55
414=17
<
10
5
55
56
56
57
57
58
58
Cadmium vow "-5 ^coar
Mnelmum tlnle point:
• a
Date Data BDL=1/2DL Results I
Sld De, NO DATA
Mean NO DATA
C.V. NO DATA
n 0
Mult Factor = WA
Max. Value WA ug/L
Max. Pred Cw WA ug/L
Total Phenolic Compounds
Date Data BDL=112DL Results
Ste Dev.
Mean
C.V.
n
Mu6 Facto=
Max. Value
Max. Pred Qv
T dMp ..
&1i"Mm
Data
NO DATA
1
NO DATA
2
NO DATA
3
0
4
5
WA
6
WA ug/L 7
WA ug/L 1 8
NCO083551 updated SALTWATER RPA w_tliss factors 20167a,dala
Date)

Chromium VI
Data BDL=112DL Results
SIa Dev. NO DATA
Mean NO DATA
C.V. NO DATA
n 0.0
Mutt Facia= WA
Mu. Value WA uglL
Max. Pred Qv WA ug(.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
REASONABLE POTENTIAL ANALYSIS - DATA
Chromium, Total
Date Data BDL=laDL Results
Slo Dev.
Mean
C.V.
n
Mull Factor =
Max. Value
Max. Pred C.
ae
NO DATA
NO DATA
0
WA
WA uglL
WA ugfL
Copper
Dale
Data
BDL-112DL
Results
1/2/2013
10
5
Ste Dev.
0.0000
402013
10
5
Mean
5.0000
7/9/2013
10
5
C.V.
0.0000
10r8/2013
<
10
5
n
18
1n/2014
10
5
4/8/2014
10
5
Wit Faclar =
1.0000
718=14
10
5
Max. Value
5.00 ugA.
10/7/2014
<
10
5
Max. Pred Ow O
DETECTS ug/L
V712015
10
5
4/7/2015
10
5
7/8/2015
10
5
10/20I2015
<
10
5
V12/2016
<
10
5
4152016
10
5
7/132016
10
5
10/4/2016
<
10
5
1/10/2017
<
10
5
4/4/2017
<
10
5
Date Data
NCA083551 updated SALTWATER RPA w ciss factors 20167a.eata
Dale)

aim -coar
m mm wfu
-59
BDL=1/2DL Results
Std Dev. NO DATA
Mean NO DATA
C.V. NO DATA
n 0
Mull Factor= WA
Max. Value WA uglL
Max. Red Qv WA u9fL
REASONABLE POTENTIAL ANALYSIS - DATA
Lead
vaw� me<-covr.
m:.ln,om mu soma
Date
Data
BDL=112DL
Results
1/2/2013
10
5
Stc Dev.
0.00D0
1
4OM13
<
10
5
Mean
5.0DD)
2
1 7/9/2013
10
5
C.V.
0.000D
3
l 101&2013
<
10
5
n
18
4
102014
10
5
5
4/BI2014
10
5
Mutt Factor=
1.00
6
' 7/8/2014
10
5
Max. Value
5.00 u9IL
7
1 10/7/2014
<
10
5
Max. Plea Cw
0 DETECTS uSIL
8
1 1f72015
10
5
9
1 4/7/2015
10
5
10
7/82015
<
10
5
11
I 10IM2015
<
10
5
12
1 1/102016
<
10
5
13
I 4/52016
<
10
5
14
I 7/1312016
<
10
5
15
10/412016
<
10
5
16
1/10/2017
<
10
5
17
1 4/4/2017
<
10
5
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Mercury
Date Data BDL-112DL Results
Sta De,
Mean
C.V.
n
Mull Fadm
Max. Value
Max. Prey Qv
mulwl^1.
• 5a
Data Data BDL=il2DL
NO DATA
ND DATA
0
WA
WA nglL
WA nyL
NCO083551 uWatea SALTWATER RPA w_alas tadom 20167a,aala
Date)

REASONABLE POTENTIAL ANALYSIS - DATA
Nickel
.ee
Results
Date Data
BDL-112DL Results
Ste Dev.
NO DATA
1
Sid De,
Mean
NO DATA
2
Mean
C.V.
NO DATA
3
C.V.
n
0
4
n
5
MuW Factor =
WA
6
Mult Factor=
Max. Value
WA mg/L
7
Mac. Value
Max. Pred Cw
WA mgrL
8
Max. PMd Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Selenium
w d..e 4x. polo.
•x.
Date Data
BDL=112DL Results
NO DATA
1
Ste De,
NO DATA
2
Mean
NO DATA
3
C.V.
0
4
n
5
WA
6
Mutt Factor=
WA uglL
7
Max. Value
WA uglL
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
w
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
•se
Date Data
NO DATA 1
NO DATA 2
NO DATA 3
0 4
5
WA 6
WA ugtL 7
WA u9IL 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
w
51
52
53
54
55
56
57
58
Silver
BDL=112DL Results
Std De,
Mean
C.V.
n
MUW Factor =
Max. Value
Max. Pred ON
NCO033551 updated SALTWATER RPA w 4iss factors 20167a,cata
Date)

Wtlmun tls
ny
NO DATA
NO DATA
0
WA
WA uglL
WA ug1L
Zinc
Data
Data
BDL=112DL
Results
1
1117=12
<
10
5
Ste Dw
2
121WM12
18
18
Mean
3
1/ZW13
16
16
C.V.
4
2M✓2013
19
19
n
5
3/6/2013
16
16
6
4l2/2013
<
10
5
Mull Fadcr=
7
518/2013
75
75
Msx. Value
8
SIS013
11
11
Max. Free Ow
9
7IW2013
<
10
5
10
87Y2013
50
50
11
9/4/2013
15
15
12
10/8/2013
184
184
13
11/6/2013
26
26
14
12/412013
28
28
15
17/2014
500
5D0
16
2/512014
10
5
17
3/512014
<
10
5
18
4/812014
13
13
19
5712014
<
10
5
20
6/4/2014
22
22
21
7/8/2014
14
14
22
816/2014
14
/4
23
9IN2014
10
5
24
10m2014
<
10
5
25
11/512014
<
10
5
26
IZIN2014
<
10
5
27
10/2015
11
11
28
2/4/2015
<
10
5
29
WN2015
15
15
30
4/7/2015
21
21
31
5/6WI5
15
15
32
6/312015
238
23B
33
7/812015
10
10
34
8/5rAI5
10
5
35
9/2/2015
<
10
5
W
10114/2015
187
187
37
11118=15
585
595
38
1Z'2=15
118
118
39
102016
39
39
40
2P.V2016
42
42
41
&1NW%
37
37
42
4/6/2016
17
17
43
5/4/2016
15
15
44
WWII 6
25
25
45
7/6/2016
10
5
46
802016
<
10
5
47
9/7/2016
<
10
5
48
10/4/2016
18
18
49
11/2/2016
12
12
50
12J7/2016
<
10
5
51
1/10/2017
12
12
52
2/1/2017
10
5
53
311/2017
<
10
5
54
4/4/2017
<
10
5
55
56
57
58
REASONABLE POTENTIAL ANALYSIS - DATA
Nulmum Jala
47 OODO
2.3244
54
1.05D0
5W.0 ug1L
614.3 ug1L
NO DEFINED PARMETER
Data Data BDL=112DL Results
1 Sttl Dev
2 Mean
3 C.V.
4 n
5
6 Mult Fade =
7 Max. Value
8 Max. Fred Cw
Mezlm um tlele palnis
= SB
NO DATA
NO DATA
0
WA
WA
WA
NO DEFINED PARMETER
Data
Data BDL-112DL Results
1
Sle De,
NO DATA
2
Mean
NO DATA
3
C.V.
NO DATA
4
n
0
5
6
Mull Fade
WA
7
Max. Value
WA
8
Mo. Read Cw
_ WA
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
3D
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
NCODS3551 upeale0 SALTWATER RPA w_eiss fadws 20167a.0ata
Datel

REASONABLE POTENTIAL ANALYSIS - DATA
NO DEFINED PARMETER
011-'
Msslmum Nte pgnb
.e4
NO DEFINED PARMETER
Mevlmum Wb pWnb
•ss
Date Data BDL=1120L Results
d 111114
Date Data BDL=112DL Results
1 Std De,
NO DATA
1
Std Dem.
NO DATA
1
2 Mean
NO DATA
2
Mao"
NO DATA
2
3 C.V.
NO DATA
3
C.V.
NO DATA
3
4 n
0
4
n
0
4
5
5
5
6 Wit Facto=
WA
6
Mult Factor =
WA
6
7 Max. Value
WA
7
Max. Value
WA
7
8 Max. Pred Cw
WA
8
Max. Fred Ow
WA
8
9
9
9
10
10
10
11
11
11
12
12
12
13
13
13
14
14
14
15
15
15
16
16
16
17
17
17
18
18
18
19
19
19
20
20
20
21
21
21
22
22
22
23
23
23
24
24
24
25
25
25
26
26
26
27
27
27
28
28
28
29
29
29
30
30
30
31
31
31
32
32
32
33
33
33
34
34
34
35
35
35
36
36
36
37
37
37
38
38
38
39
39
39
40
40
40
41
41
41
42
42
42
43
43
43
44
44
44
45
45
45
46
46
46
47
47
47
48
48
48
49
49
49
50
50
50
51
51
51
52
52
52
53
53
53
54
54
54
55
55
55
56
56
56
57
57
57
58
58
58
NO DEFINED PARMETER
V�ma�
•5a
Data Data BDL-1120L Results
Sld Dev.
NO DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
WA
Max. Value
WA
Max. Prey C.
WA
NODD83551 updated SALT WATER RPA w_diss factors 20167a,data
Date]

NO DEFINED PARMETER
Data Data BDL-1120L Results
SIE Dev.
Mean
C.V.
n
MUM Facia =
Max. Value
Max. Prea Cw
NO DATA
NO DATA
0
WA
WA
WA
REASONABLE POTENTIAL ANALYSIS - DATA
NO DEFINED PARMETER
Dale Data BDL=112DL Results
Ste Dev.
Mean
C.V.
n
Mult Facto =
Max. Value
Max. Prey Ow
Neamum sat.
vH
NO DATA
NO DATA
0
WA
WA
WA
NCO083551 updated SALTWATER RPA w_diss team 20167a.data
Date)

Dixon WTP
NCO083551 Saltwater RPA 95% Probablity/95% Confidence
MAXIMUM DATA POINTS = 58
Qw(MGD)= 0.35
WWTPTWTP Class: PC-1
1QIOS (cfs)= Tidal, IWC = 100%
IWC% @ 1QIOS = 100
7QIOS (cfs)= Tidal, IWC = 100%
IWC% @ 7QIOS= 100
7QIOW (cfs)= Tidal, IWC = 100%
IWC%@ 7QIOW = 100
30Q2(cfs)= Tidal, IWC =100%
IWC%@3GQ2= 100
Avg. Stream Flow, QA Ica)= Tidal, IWC =100%
IWC%@QA= 100
Receiving Stream: LIT to Stones Creek
Stream Class: SA, HOW - PNA
Outfall 001
Qw = 0.3468118 MGD
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS HOW OR ORIN.
PARAMETER
NC STANDARDS OR EPA CRITERIA
ur
REASONABLE POTENTIAL RESULTS
TYPE
111
a
Z
RECOMMENDED ACTION
Applied
Chronic Acute
n # Det Max Pred Cw Allowable Cw
Standard
Acute (SW): 34.5
No RPA, Predicted Max < 505/6of Allowable Cw
Arsenic
C
18 SW(7QIOs) 34.5
ug/L
- No Monimringrequired-------------
55 1
12.1
_ _ _ _ _
Chronic (SW): 18.0
No RPA, Predicted Max >_ 50%of Allowable
No value> Allowable Cw
Cw - a ly
Arsenic
C
HH(Qavg)
ug/L
_
Cbronic(HH): 5.0
.
RPA for non -AL- apply Monthly Monitoring
I values > Allowable Cw
with Limit
Acute: 20.10
Cadmium
NC
4.45 SW(7QIOs) 20.1
ug,L
0 0
N/A
Acute: NO WQS
Total Phenolic Compounds
NC
150 A(30Q2)
10.0
ug/L
0 0
N/A
_ _ _ _ _ ------------------------------
Acute: 553.9
Chromium Vi
NC
25.2 SW(7QIOs) 553.9
ug/L
0 0
N/A
_ _ _ ___ _ _ _
Chronic: 25.2
_ _ _ _ _ _ _ _ _ _ _ _ __
Chromium, Total
NC
ug/L
0 0
N/A
Acute: 2.90
No RPA, Predicted Max < 50% of Allowable Cw
Copper
NC
1 85 SW(7QIOs) 2.9
ug/L
18 0
AVO DETECTS
- No Monimring required
_ __ _ __
Cl_ll 1
Max MDL= 10
-No Monitoring required
Acute: 0.5
Cyanide
NC
0.5 SW(7QIOs) 0.5
10.0
ug/L
0 0
N/A
_ _ ___ _
_ _ — _ _ — _ _ _ _ _
Chronic: 0.5
Acute: I IOAO
No RPA, Predicted Max <50%of Allowable Cw
Lead
NC
4.25 SW(7QIOs) 110.4
ug/L
19 0
VO DETECTS
-NO Monitoring uireA
_ __ _ _
Chmnic: 425 �
No RPA, Predicted Max < 500% of Allowable Llv
Max MDL=10
-No menimrin uircd
Acute: NO WQS
Mercury
NC
12.5 SW(7QI0s)
0
m.1_
n 0
N/A
_
Acute: NO WQS
Molybdenum
NC
I HH(7QlOs)
mg/L
0 0
N/A
---------------------------------------------
NCO083551 updated SALTWATER RPA w_diss factors 20167a.ma
Page 1 of 2 6/20/2017

Dixon WTP
NCO083551
Saltwater RPA 95% Probablity/95% Confidence
Outfal 1001
Qw = 0.3468118 MGD
Chronic: 1.0
--------- --
Acute: 37.35
Nickel
NC
4.15 SW(7QIOs) 37.35
ug/L
0 0
N/A
- _ _ __
_ - - - - - -_-___
_
Chronic 4.15
Acute: NO WQS
Selenium
NC
35.5 SW(7QIOs)
ug/L
0 0
N/A
_ _ — _ _ --
— _—_— — ——_—_—_—_—_—_—_ --
_ _
Chronic 35.5
Acute: 1.10
Silver
NC
0.05 SW(7QIOs) 1.1
ug/L
0 0
N/A
__- - --_-_---_-_-_-_-___
__
Chronic: 0.05
Acute: 47.6
RPA for non -AL -apply Monthly Monitoring
Zinc
NC
42.9 SW(7QIOs) 47.55
ug/L
54 34
614.25
with Limit __
_
Chronic 42.R
RPA for non -AL -apply Monthly Monitoring
S aluos) - Allowable l'w
with Limit
Acute:
0 0
N/A
----'—_—
----_—_-----_----------
Chronic
Acute:
U 0
N/A
_ _ —
__—_------_—_
Chronic:
Acute:
0 0
N/A
Chronic
Acute:
0 U
N/A
-------- -
-----------------------
— --
Chronic-
Acute:
0 0
N/A
—_—
_—_---_—_—_—_—_ --
Chronic:
Acute:
U 0
N/A
--------
----------------------'
Chronic:
Acutc:
0 0
N/A
---------- ---------
---
Chronic
NCO083551 updated SALTWATER RPA w_diss factors 20167a,rpa
Page 2 of 2 6/20/2017

White Oak River Basin
AU Number: J AU Name:
AU Description:
19-39-1a Rogers Bay
At mouth
Length Area: ))AU Units:
4.0 S Acres
SA;HQW
RCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Shellfish Growing Area -Conditionally Approved Open (Fecal, SH, SA) 2010 2002
19-39-1b Rogers Bay 41.8 S Acres SA;HQW
Entire Bay
RCategory:
ACS:
Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC
Shellfish Growing Area -Prohibited (Fecal, SH, SA)
2010
2002
19-41-3 Salliers Bay 60.2 S Acres SA;HQW
Entire Bay
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Shellfish Growing Area -Prohibited (Fecal, SH, SA) 2010 2002
19-30b Stones Bay 32.6 S Acres SA;HQW
From Stones Creek to DEH closure line.
RCategory:
ACS:
Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC
Shellfish Growing Area -Prohibited (Fecal, SH, SA)
2010
2002
19-30a2 Stones Bay 13.9 S Acres SA;HQW
Entire Bay except for the area enclosed by the DEH closure at the mouth of Stones Creek.
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Shellfish Growing Area -Prohibited (Fecal, SH, SA) 2010 2008
19-30-3 Stones Creek 76.9 S Acres SA;HQW
From source to Stones Bay
RCategory:
ACS:
Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC
Shellfish Growing Area -Prohibited (Fecal, SH, SA)
2010
2002
18-87-3 Stump Sound 87.3 S Acres SA;ORW
Entire Sound excluding that portion in King Creek Restricted Area
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Shellfish Growing Area -Conditionally Approved Open (Fecal, SH, SA) 2010 2002
18-87-0.5 Stump Sound ORW Area 939.9 S Acres SA;ORW
All waters between the s edge of the White Oak RB to the western end of Permuda Is. exclusive of the restricted area
RCategory:
ACS:
Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC
Enterrococcus (GM 35, REC, SW) Sn30
2009
2014
5
EC
Shellfish Growing Area -Conditionally Approved Open (Fecal, SH, SA)
2010
2006
2014 NC 303(d) List -Category 5 Final December 19, 2014 Page 108 of 149

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
This form must be completed by Permit Writers for all expedited permits which do not require full Fact Sheets.
Expedited permits are generally simple 100% domestics (e.g., schools, mobile home parks, etc) that can be
administratively renewed with minor changes, but can include facilities with more complex issues (Special
Conditions, 303(d) listed water, toxicity testing, instream monitoring, compliance concerns).
Basic Information for Expedited Permit Renewals
Permit Writer/Date
Brianna Young 10/3/2017
Permit Number
NCO083551
Facility Name
Dixon WTP
Basin Name/Sub-basin number
White Oak 03-05-02
Receiving Stream
UT to Stones Creek
Stream Classification in Permit
SA-HQW-PNA (see comments below regarding
PNA*)
Does permit need Daily Max NH3 limits?
No
Does permit need TRC limits/language?
Yes, per 2009 WTP strategy and application —
Language and limit added
Does permit have toxicity testing?
Yes
Does permit have Special Conditions?
Yes - Toxicity re -opener already present; discharge
alternatives evaluation added
Does permit have instream monitoring?
Yes
Is the stream impaired (on 303(d) list)?
Yes see below
Any obvious compliance concerns?
1 NOD for pH, 2 enforcement cases for TSS, 1
NOD for chloride, 3 NODs for iron, 1 NOD for
TDS in previous 5 years; toxicity testing not
consistently passing in previous permit cycle (failed
8 since January 2012
Any permit mods since lastpermit?
Yes — Reverse Osmosis system is now in use
Current expiration date
June 30, 2017
New expiration date
November 30, 2022
Comments received on Draft Permit?
* Based on communications in previous permit history between DWR and NC Division of Marine
Fisheries, the stream classification in the permit has included PNA per Marine Fisheries
recommendation; BIMS does not reflect this information
Failed 3 of the last 12 toxicity tests (failed 2 of the last 4)
Impaired listing:
19-30-3 Stones Creek 76.9 S Acres SA;HQW
From source to Stones Bay
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Shellfish Growing Area -Prohibited (Fecal, SH, SA) 2010 2002
Per previous factsheet: Stones Creek has been designated as a prohibited area for shellfish harvesting,
and therefore is 303d listed. The actual reason for the designation is based upon surveys conducted by
the Shellfish Sanitation Section of DMF, which has found their bacteriological standards tobe
exceeded in the stream for many years. Their staff had very little concern regarding the discharge from
this water treatment plant and its potential to impact shellfish habitat.

46
Update to previous factsheet notes: Potable water generated from the RO, greensand filter, and ion
exchange systems is blended to produce a final product with adequate taste characteristics for
consumers.
Chances from previous permit:
• Added Section A(5) for eDMR language, and footnote in table in A(1)
• Added regulatory citations
• Updated outfall map
• City on cover sheet and supplement to cover sheet updated from South of Dixon to Holly Ridge
per renewal application
• Address on supplement to cover sheet updated from 6661 US Highway 17 to 6661 Wilmington
Highway per permit application
• Updated language on Supplement to Permit Cover Sheet to match formatting currently used
• Updated supplement to cover sheet to include RO filtration in components list and specify
treatment for water and wastewater
o David Mohr sent components list via e-mail 6/14/17
• Removed "After construction of new water treatment facilities, discharge reverse osmosis
reject wastewater through the existing wastewater treatment apparatus and outfall" from
supplement to cover sheet as RO filtration system currently in use
• Weekly Instantaneous flow monitoring removed from the table in A(1) as the facility is now
required to perform continuous recording monitoring
• Total Phosphorus parameter changed from 00665 to CO665 to reflect current code
• Total Nitrogen parameter changed from 00600 to CO600 to reflect current code
• Total Suspended Solids parameter changed from 00530 to CO530 to reflect current code
• Fluoride changed to Total Fluoride to match current parameter code used and 2009 WTP
strategy
• Temperature monitoring removed per 2012 WTP guidance
• Monitoring for salinity, conductivity, total dissolved solids, total suspended solids changed
from grab to composite based on IE WTP 2009 strategy — more stringent than grab sampling
• Monitoring for turbidity changed from monthly to 2/month per 2009 WTP strategy for
greensand plants — more stringent
• Monitoring for total iron removed as there are no longer water quality standards; application
states they do not discharge iron sulfate or ferrous sulfate
• Monitoring for total fluoride removed as there is no saltwater standard for fluoride per 2012
WTP strategy
• Limits added for Total Zinc and Total Arsenic based on RPA
• Because the facility has experienced whole effluent toxicity testing failures during the current
permit cycle, a condition was kept from the previous permit that will allow the Division to
reopen the permit to add limits for whole effluent toxicity (Section A[3])
• Section A(4) added for discharge alternatives evaluation due to history of failed tox tests
• Added Total Residual Chlorine monitoring and footnote to effluent table per 2009 WTP
strategy as permittee stated in application that chlorine has the potential to be discharged
• Added monthly Ammonia Nitrogen monitoring per 2009 WTP strategy for ion exchange and
RO plants

o Removed from previous permit; previous fact sheet states that the facility did not
introduce NH3-N into wastewater flow; readded as facility now using RO technology
and ammonia nitrogen is a pollutant of concern for RO plants
• Updated language in A(2) to current tox language
• Added Section A(4) due to history of failed toxicity tests, and the plant has RO and IE elements
• Expiration date updated to allow full 5-year permit cycle
Cover letter language:
Please note that the receiving stream is listed as an impaired waterbody on the North Carolina 303(d)
Impaired Waters List. Addressing impaired waters is a high priority with the Division, and instream
data will continue to be evaluated. If there is noncompliance with permitted effluent limits and stream
impairment can be attributed to your facility, then mitigative measures may be required.
Whole Effluent Toxicity test results submitted during the past three years have demonstrated that the
Water Treatment Plant's effluent is showing potential for causing aquatic toxicity in the receiving
stream. As a result, the Onslow Water and Sewer Authority shall perform a Discharge Alternatives
Evaluation as described in Section A. (4) of this permit. This evaluation is being requested to
determine whether there are any economical and technologically feasible alternatives available to the
Onslow Water and Sewer Authority to comply with all NC Water Quality Standards. The permittee
will be given approximately one permit cycle to evaluate and document possible treatment/discharge
alternatives to eliminate aquatic toxicity. The evaluation shall be submitted with the permittee's next
permit renewal application and will be carefully reviewed by the Division and the results will be used
in the development of a compliance schedule or possible variance request for the Onslow Water and
Sewer Authority.
Comments from regional office (per Dean Hunkele via e-man3/30/17)
• New RO system is now online, thus system description will need to be updated. The
limits/monitoring changes for it were added in the last modification and they have been
sampling in accordance with even though not all was probably required until now.

Young, Brianna A
From: David Mohr <[e-mail]>
Sent: Friday, June 16, 2017 3:27 PM
To: Young, Brianna A
Subject: FW: Confirmation of components at the Dixon WTP
Attachments: October 2014 Dixon WTP Data.pdfi August 2014 Dixon WTP Data.pdf
Brianna:
Per your request, see below and attached. Let me know if you need additional information.
b ONWASA
David M. Mohr, PE
Engineering Director
Onslow Water and Sewer Authority
228 Georgetown Road
Jacksonville, NC 28540
910-937-7521
From: James McDonnel
Sent: Wednesday, June 14, 2017 9:09 AM
To: David Mohr
Cc: Todd Roberts; Seth Brown; Eddie Caron
Subject: RE: Confirmation of components at the Dixon WTP
Part 1: Nine (9) greensand filters, six (6) ion exchange softeners, Three (3) 1MGD RO skids with thirty (30) membrane
vessels per skid, and three (3) 0.915 MG settling basins
Part 2: The arsenic and zinc numbers were reported from the lab in mg/L. I have attached the lab sheets as requested. I
do not have access to any eDMR's prior to October 2015. Will a mailed paper copy be sufficient?
Thank You,
C6 ONWASA
Jim McDonnel
Water Treatment Plant Supervisor at Dixon WTP
910-915-6937
Winners Are Not Those Who Never Fail, But Those Who Never Quit
Edwin Louis Cole

Environmental -Chemists, Inc.
envirochem 6602 Windmill Way • Wibnington, NC 28405
[phone] (lab) • [phone] (Fax)
® 710 Bows rtown Road • Manteo, NC 27954
[phone]
ANALYTICAL & CONSULTING
CHEMISTS NCDENR: DWQ CERTIFICATE #94. DI-9 CERMCATE #37729
Onslow, Water & Sewer Authority
Post Office Box 1415
Jacksonville NC 28541
Attention: Todd Roberts
Date of Report: Aug 14, 2014
Customer PO #:
Customer ID: 08100092
Report #: 2014-09456
Project ID: Dixon WTP - Monthly
Lab ID Sample ID: Collect Date/Time Matrix Sampled by
14-23245 Site: Effluent Comp 8/6/2014 7:00 AM Water Charles Bryan
Test Method Results
Date Analyzed
Iron EPA2OD.7 0.067mg/L ✓
08/13/2014
Manganese EPA200.7 0.342mg/L /
08/13/2014
J
Zinc EPA200.7 0.014mg/L
08/12/2014
Lab ID Sample ID: Collect Date/Time Matrix Sampled by
14-23246 Site: Effluent- Grab 8/612014 7:07 AM Water Charles Bryan
Test Method Results Date Analyzed
Arsenic EPA200.7 <0,010mg/L ✓ 08/12/2014
Comment:
Reviewed by:
Report #-.: 2014-09456 Page 1 or i

1FJ[exvi ochi emn
ANALYnM & CONSULTIM
CHEMISTS
Onslow Water & Sewer Authority
Post Office Box 1416
Jacksonville NC 28541
Attention: Todd Roberts
Envliron, nental laem-t s, Inc.
6502 Windmill Way • W11nnkOM, NC 2UM
(910) 3924W3 (Lab) • (910) 392-"U (Fax)
710 Bowswtmm Road • Mango, NC 27954
V52) 473 5702
NMIE - DWQ CER MICA'M #K DLS CERTIMATE 037M
Date of Report: Oct 22, 2014
Customer PO #:
Customer ID: 08100092
Report ft 2014-12341
Project ID: Dixon WTP - Monthly
Lab ID
Sample ID:
Collect Datemme
Matrix Sampled by
14-30286
Sibs: Effluent Comp
1017/2014 8:00 AM
Water Charles Bryan
Test
Method
Results Data Analyzed
Iron
EPA2W7
0.048 rng/L
10/13/2014
Zine
EPA 2K7
<0.010 mg/L
10/13/2014
Copps
EPA W s
<0.010 mg/L
10113/2014
Lead
EPA 2W.e
<0.010 mg1L
10113,2014
Manganese
WA 200,8
0.208 nV L
10/14/2014
Lab ID
Sample ID:
Collect Datomme
Matrbc Sampled by
14-30286
gibe: Effluent- Grab
10/7/2014 8:00 AM
Water Charles Bryan
Test
Method
Results Date Analyzed
Arsenic
EPA200.7
<0.010 mg/L /
10/15/2014
Comment+
r
Reviewed by:
•.
RepWft 2014-12MI Pegs 1 d 1

Young, Brianna A
From: Young, Brianna A
Sent: Tuesday, June 13, 2017 3:30 PM
To: 'David Mohr'
Cc: Jeff Hudson; Eddie Caron; Seth Brown; [e-mail]
Subject: RE: Confirmation of components at the Dixon WTP
Mr. Mohr,
In addition to the components list, please provide the lab data sheets for August 2014 and October 2014. The values
reported on the DMRs for Arsenic and Zinc are reported as ug/I, but there is no change in the magnitude of values as
those reported in other months as mg/I. If these values have been reported in error, please submit revised DMRs to the
Division for these months reporting values in the correct units.
Thank you,
Brianna Young
Environmental Specialist
Division of Water Resources
N.C. Department of Environmental Quality
Office: 919-807-6333
Brianna.Youno aancdenr.gov
Mailing address:
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties.
From: David Mohr [mailto:[e-mail]]
Sent: Tuesday, June 13, 2017 2:44 PM
To: Young, Brianna A <[e-mail]>
Cc: Jeff Hudson <[e-mail]>; Eddie Caron <[e-mail]>; Seth Brown <[e-mail]>;
[e-mail]
Subject: RE: Confirmation of components at the Dixon WTP
Ms. Young:
Will get something together and send it to you as soon as completed.
b ONWASA
David M. Mohr, PE
Engineering Director
Onslow Water and Sewer Authority
228 Georgetown Road
Jacksonville, NC 28540
910-937-7521

From: Young, Brianna A [mailto:Brianna.Young ncdenr.gov
Sent: Tuesday, June 13, 2017 2:07 PM
To: Jeff Hudson; David Mohr; Eddie Caron; Seth Brown; mharrisCnlonwasa.com
Subject: Confirmation of components at the Dixon WTP
Good afternoon,
I am currently working on the permit renewal for the Dixon WTP (NC0083551), and would like to confirm the
components at the facility. Based on the renewal application, it appears the facility uses greensand filters, ion exchange
softeners, reverse osmosis filters, and (3) 0.915 MG settling basins.
Could you please provide a complete components list? With the list, please indicate the number in use for each item.
Please let me know if you have any questions.
Thank you,
Brianna Young
Environmental Specialist
Division of Water Resources
N.C. Department of Environmental Quality
Office: 919-807-6333
Brianna.Youno aOncdenr.gov
Mailing address:
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties.
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.

Young, Brianna A
From: Hunkele, Dean
Sent: Thursday, March 30, 2017 4:14 PM
To: Young, Brianna A
Subject: NCO083551 Dixon WTP renewal
Importance: High
Only comment is that the new RO system is now online, thus system description will need to be updated. The
limits/monitoring changes for it were added in the last modification and they have been sampling in accordance with it
even though not all was probably required until now.
Dean Hunkele
Senior Environmental Specialist
Water Quality Regional Operations Section
Division of Water Resources
Department of Environmental Quality
910.796.7215 Reception Desk
910.796.7380 Direct
910.350.2004 Fax
[e-mail]
Wilmington Regional Office
127 Cardinal Drive Ext
Wilmington, NC 28405
W.
Nothing Compares �
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
The goal of the Fast Track sewer permit program is to issue a permit In no more than 30 business days from receipt of a complete application and if
no additional information has to be requested upon full review. Please use the Department's Permit Application Tracker to determine the official
application receipt date to allow you to estimate a date for issuance and find the reviewer's name. Once issued, the record stays on the site for 30
days.
For previously issued sewer permit info or to check on sewer certification receipt status, please use the Division's Sewer Extension Permit
Tracker. Using the Issue Date on top of the Engineer Certification Form is best way to ensure getting what you want especially for multi -version
permits; using today's date only gives Info on the latest permit version. Confirmation using this method will replace letters and emails: it is
recommended that confirmation be printed and/or saved.
Links to both trackers can be found on the sewer permitting site here: httos://deg.nc.gov/about/divisions/water-resources/water-resources-
pe rmits/peres/co I lection-syste ms-perm its
Subscribe to Collection System Updates Iistserve to receive automatic alerts for changes to applications, policies, regulations, etc.

Member Governments AHolly RidgeONw
�� Engineering Division
Jacksonville
North Topsoil Beach 910.937.7521 Tel
Onslow County 910.455.5607 Fox
San Richlands
Swonsboro Onslow Water &Sewer Authority
December 30, 2016
North Carolina Department of Environmental Quality
Division of Water Resources
Water Quality Permitting Section — NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Application for Renewal RECEIVEDUDEQUIVR
Dixon Water Treatment Plant JAN 0 4 2017
NPDES Permit NCO083551 Water Quality
Permitting Section
Greetings:
This letter is sent in response to a request received on December 5, 2016 regarding
renewal of the above -referenced NPDES permit.
As referenced in our previous (2011) combination permit renewal / modification
application, ONWASA is currently finalizing the installation of reverse osmosis (RO) treatment
equipment that will work in tandem with the conventional treatment system at this facility.
Purpose of the RO treatment is to assist in the removal of trace organics and silica from the
finished water. The discharge information provided on the application reflects this operational
approach.
We hope the enclosed information is satisfactory for renewal of the permit for this
facility; if you have any questions or require additional information please feel free to contact me
directly at (910)-937-7521 or dmohrgonwasa.com.
Sincerely,
(: JA . a
David M. Mohr, P.E.
Engineering Director
Encl.
CC: Eddie Caron, Utility and Planning Superintendent
228 Georgetown Road • P.O. Box 1415 • Jacksonville, NC 28540 • Tel [phone] • Fax [phone] • www.onwasa.com

Member Governments NOnslow
T T ♦ /�Holly RidgeW 1//�\\ill\\Jl'la<ksonWlkNorth Topsoil Beach
Onslow County
Richlands
Swansboro 0 Water
RESIDUALS MANAGEMENT PLAN
DIXON WATER TREATMENT PLANT
NPDES PERMIT NUMBER NCO083551
December 29, 2016
Engineering Division
910.9377521 Tel
910.455.5607 Fox
Removal of solids from the three sedimentation (3) lagoons at the Dixon Water Treatment Plant
is accomplished through a "pump and haul" method. Accumulated material is pumped from
each basin and then dewatered on site until passing USEPA Test Method 909513: Paint Filter
Liquids Test. The dewatered material is then transported by truck to the Onslow County Landfill
for final disposal. Solids removal is performed approximately once every three (3) years so as
not to allow solids accumulation to interfere with detention times.
David M. Mohr, P.E.
Engineering Director
ONWASA
7.9
'a SEAL r•
043996 =
�YGINE��'
Page I of I
228 Georgetown Road • P.O. Box 1415 • Jacksonville. NC 28540 • Tel [phone] • Fax [phone] • www.oawasa.com

Dixon WTP
Poly" Outfall Point
34 34.424
-!!- 77 28.277