HomeMy WebLinkAboutNC0021521_Draft Permit_20191002 ROY COOPER
Governor
MICHAEL S. REGAN
Sect-only
'40+' LINDA CULPEPPER
NORTH CAROLINA Interim Director
Environmental Quality
October 2, 2019
Mr. Chuck Bonner
Director of Public Works
P.O.Box 86
Aurora,NC 27806-0086
Subject: Draft NPDES Permit NC0021521
Aurora WWTP
Grade I Biological WPCS
Beaufort County
Dear Mr. Bonner:
The Division has reviewed your request to renew the subject permit.Please review this draft carefully to ensure a
thorough understanding of the information,conditions,and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
> Section A. (4)has been updated regarding electronic submission of effluent data.Federal regulations
require electronic submittal of all discharge monitoring reports(DMRs).
> Regulatory citations have been added to the permit.
➢ Parameter codes have been updated.
> Removed Mercury Special Condition section,updated in footnotes.
With this notification,the Division will solicit public comment on this draft permit by publishing a notice in
newspapers having circulation in the general Beaufort County area,per EPA requirements.Please provide your
comments,if any,to me no later than 30 days after receiving this draft permit.
Following the 30-day public comment period,the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit.If you have questions concerning the draft,please contact me at
919-707-3699,or via e-mail at Kristin.Litzenberger@ncdenr.gov.
Sincerely,
yi414434ftri-.
• Kristin Litzenberger
NPDES Program
cc: NPDES File
DEQ
North Carolina Department of Environmental QualityDivision of Water Resources
P I
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-3712
Permit NC0021521
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended, the
Town of Aurora
are hereby authorized to discharge wastewater from a facility located at the
Aurora WWTP
Idalia Road
Aurora
Beaufort County
to receiving waters designated as South Creek [stream index 29-28-(4)] in subbasin 03-03-07 of the Tar-
Pamlico 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
This permit and authorization to discharge shall expire at midnight on November 30, 2024.
Signed this day
DRAFT
for Linda Culpepper, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7
Permit NC0021521
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility,whether for operation or discharge are hereby revoked. As of this permit
issuance,any previously issued permit bearing this number is no longer effective.Therefore,the exclusive authority to
operate and discharge from this facility arises under the permit conditions,requirements,terms,and provisions included
herein.
The Town of Aurora is hereby authorized to:
1. Continue to operate an existing 0.12 MGD wastewater treatment system that includes the following
components:
➢ 4-acre lagoon system
➢ 1-acre pond
➢ 1.28 acre surface-flow constructed wetland consisting of 2 parallel cells
➢ Gas chlorination system [with liquid supplementation]
➢ Caustic drip system for pH control
➢ Dechlorination contact chamber
➢ Flow measuring device
➢ Effluent lift station
This facility is located at the Aurora WWTP (Idalia Road, Aurora) in Beaufort County.
2. Discharge from said treatment works at the location specified on the attached map into South Creek
[stream index 29-28-(4)], currently classified SC-NSW waters in subbasin 03-03-07 of the Tar-
Pamlico River Basin.
Page 2 of 7
Permit NC0021521
PART I
Grade I Biological Water Pollution Control System [15A NCAC 08G.0302]
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 Permittee as
specified below:
PARAMETER LIMITS MONITORING REQUIREMENTS
(Parameter Code) Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location
Flow Influent or
0.12 MGD Continuous Recording
(50050) Effluent
BOD,5-day(20°C)2
Influent
30.0 mg/L 45.0 mg/L 2/Month Composite
(C0310) Effluent
Total Suspended Solids2 Influent&
90.0 mg/L 135.0 mg/L 2/Month Composite
(C0530) Effluent
NH3 as N (C0610) 2/Month Composite Effluent
Dissolved Oxygen2 (00300) Daily average>5.0 mg/L Weekly Grab Effluent
Enterococci(geometric mean) (61211) 35/100 mL 276/100 mL Weekly Grab Effluent
Total Residual Chlorine3 (50060) 13 µg/L Daily Grab Effluent
Temperature(°C) (000/0) Weekly Grab Effluent
Total Nitrogen(TN) (C0600) Monitor&Report(mg/L) 2/Month Composite Effluent
TN=TKN+(NO2-N+NO3-N)
Total Kjeldahl Nitrogen(TKN) Monitor&Report(mg/L) 2/Month Composite Effluent
(00625)
Nitrite/Nitrate (NOz N+NO3 N) Monitor&Report(mg/L) 2/Month Composite Effluent
(00630)
Total Phosphorus (C0665) Monitor&Report(mg/L) 2/Month Composite Effluent
pH (00400) >6.8 and<8.5 standard units 2/Month Grab Effluent
Total Mercury4 (COMER) 1/Permit4 Grab Effluent
Acute Toxicity5 (TGE3E) Quarterly Composite Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR system[See A.(4.)].
2. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 35%of the respective
influent value(65%removal).
3. 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.TRC limit and monitoring requirements apply only if
chlorine is added to disinfect.
4. The permittee shall collect one sample of total mercury in calendar year 2024. Sampling and analysis will be performed
as specified in EPA Method 1631 E.
5. Acute Toxicity(Mysid shrimp 24-hour)Pass/Fail,no significant mortality at 90%with testing in March,June,
September and December[see A. (3)].
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
Page 3 of 7
Permit NC0021521
A. (2) NUTRIENT REDUCTION REQUIREMENT
[NCGS 143-215.1 (b)]
Dischargers to the Tar-Pamlico River are subject to the requirements,terms and conditions,of the Tar-Pamlico
Nutrient Sensitive Waters Implementation Strategy: Phase III adopted April 14,2005.Non-members of the Tar-
Pamlico Association(Association)will maintain or receive permit effluent limits for Total Nitrogen and for Total
Phosphorus concentrations as defmed in the Strategy. Any revisions to the Strategy during the life of this permit
are applicable.
If requirements other than those listed in this permit are adopted as part of a revision of the Strategy, the Division
reserves the right to reopen this permit to include these requirements.
A. (3) ACUTE TOXICITY LIMIT (QUARTERLY)
[15A NCAC 02B.0200 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%(defmed as treatment two in the procedure document).The tests will be
performed on a discharge event during each quarter(January-March,April-June,July-September,October-
December).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.
Should any single quarterly monitoring indicate a failure to meet specified limits,then monthly monitoring
will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above.
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 7
Permit NC0021521
Should the permittee fail to monitor during a month in which toxicity monitoring is required,then monthly
monitoring will begin immediately until such time that a single test is passed.Upon passing,this monthly test
requirement will revert to quarterly in the months specified above. Assessment of toxicity compliance is based on
the toxicity testing quarter,which is the three-month time interval that begins on the first day of the month in
which toxicity testing is required by this permit and continues until the fmal day of the third month
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.
A. (4.) 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):
• Section B.(11.) Signatory Requirements
• Section D.(2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting [Supersedes Section D. (2.)and Section E. (5.) (a)I
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.
Page 5 of 7
Permit NC0021521
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:
• 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 122.41(1)(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:
http://www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-system-npdes-
electronicreporting-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:
https://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B.(11.)(b)and supersedes Section B.(11.)(d)l
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. (11.)(b). A person,
and not a position,must be delegated signatory authority for eDMR reporting purposes.
Page 6 of 7
Permit NC0021521
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 system,
registering for eDMR and obtaining an eDMR user account,please visit the following web page:
http://portal.ncdenr.org/web/wq/admin/bog/ipu/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:
"I certf, 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.lam 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 7 of 7
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NC0021521 - Aurora WWTP Facility AMMINIIIIIVIL
Latitude: 35°17'42" Longitude: 76°46'35" Location
USGS Quad:Aurora,N.C. Stream Class:SC-NSW -e-
Receiving Stream:South Creek Subbasin:03-03-07 Beaufort County
Stream Index:29-28-(4) N ` Map not to scale