HomeMy WebLinkAboutNC0025241_Draft Permit_20190402 ROY COOPER • Y�r V.
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Governor �7 ,
MICHAEL S.REGAN
Secretary ,.
LINDA CULPEPPER NORTHrCAROLINA
Director Environmental Quality
April 2, 2019
Ms. Monica Dodson
Wastewater Treatment and Biosolids Recycling Manager
Orange Water& Sewer Authority
400 Jones Ferry Road
Carrboro,North Carolina 27510
Subject: Draft NPDES Permit Renewal
Permit NC0025241
Mason Farm WWTP
Orange County
Grade IV Biological WPCS
SIC Code 4952
Dear Ms. Dodson:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• Based on no reasonable potential for Nitrate to exceed water quality standards but
predicted maximum effluent concentration is greater than 50% of allowable discharge
concentration, limits for Nitrate Nitrogen (NO3-N)have been removed from the permit,
and monitoring frequency has been reduced from monthly to quarterly [See Section A.
(1)].
• Weekly monitoring for NO3-N +NO2-N has been added to the permit for calculation of
Total Nitrogen [See Section A. (1)].
• Per the Jordan Lake Wastewater Discharge Rule and as no Authorization to Construct
permit was received by December 31, 2016, the annual mass limit for Total Nitrogen of
134,375 lb/year became effective on January 1, 2016. Accordingly, the annual TN load
limit has been updated in Section A. (1). Effluent Limitations and Monitoring
Requirements.
• Quarterly monitoring requirements for total copper, total zinc and total mercury have
been removed from the permit based on no reasonable potential to exceed water quality
standards [See Section A. (1)].
512NorthNorthCarolinaSalisbury DepartmentStreet1of1617 EnMviroailnmentalServiceCenterIRaleighQuality I DivisionNorthofWaterCarolinaResou27es 699 1617NORMNOR�CNUJ N 1).
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• Effluent data reported for arsenic, lead and silver was all less than detection, at a detection
level of less than 10 µg/L for arsenic, less than 5 µg/L for lead, and less than 5 µg/L for
' silver. In accordance with 15A NCAC 2B .0500 all test procedures must produce detection
and reporting levels that are below the permit discharge requirements and all data generated
must be reported to the approved detection level or lower reporting level of the procedure.
Currently, DWR's laboratory identifies the Practical Quantitation Limit(PQL) for arsenic
at < 2 µg/L, lead at <2 µg/L and silver at < 1 µg/L. The allowable monthly discharge
concentration for your facility is 11.9 µg/L for arsenic, 7.1 µg/L for lead and 0.06 µg/L for
silver. Therefore, future sampling for arsenic, lead and silver as part of the Effluent
Pollutant Scans should analyze these parameters down to the lower reporting level of the
procedure or PQLs as listed above. No limits or additional monitoring requirements for
arsenic, lead and silver were added to the permit at this time;however, if these parameters
are not sampled down to the lower levels, limits and/or monitoring may be added to the
next permit renewal.
• Some of the wording has changed in Section A. (2). Instream Monitoring Requirements,
please review carefully.
• Some of the wording has changed in Special Condition A. (3). Chronic Toxicity Permit
Limit,please review each paragraph carefully.
• Special Condition A. (4)has been modified to include the specific three years in which the
Effluent Pollutant Scans shall be performed(2020,2021,and 2022). In addition,at the end
of the Special Condition, 2nd species Toxicity Testing Requirements for municipal permit
renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added.
• Some of the wording has changed in Special Condition A. (5).Nutrient Allocations and A.
(6). Annual Limits for Total Nitrogen or Total Phosphorus, please review each paragraph
carefully.
• Effluent mercury data was reviewed from January 2014 to May 2018.The Permittee started
testing effluent mercury using EPA test Method 1631E in January 2014. In accordance
with the 2012 Mercury TMDL NPDES Guidance the permittee needs to show annual mean
effluent concentrations below the Water Quality Based Effluent Limitation (WQBEL) of
12.5 ng/L, and all individual values below the Technology Based Effluent Limitation
(TBEL)of 47 ng/L. A review of the data showed that the annual averages were below the
WQBEL and no individual value exceeded the TBEL, therefore, no mercury limitation is
required.
Three out of 19 low level effluent mercury samples collected since January 2014 were over
1 ng/L. As a result, a Mercury Minimization Plan (MMP) requirement has been added to
this permit renewal. See section A. (9). Please note that the Permittee shall develop and
implement a MMP during this permit term. The MMP shall be developed within 180 days
of the NPDES Permit Effective Date, and shall be available for inspection on-site. A
sample MMP was developed through a stakeholder review process and has been placed on
the Division website for guidance (https://deq.nc.gov/about/divisions/water-
Page 2 of 3
resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits, under
Model Mercury Minimization Plan).
• Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and program reports. The requirement to continue reporting discharge monitoring
data electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)
internet application has been updated in the permit. [See Special Condition A. (10)]
• Regulatory citations have been added to the permit.
The NPDES standard conditions (Parts II, III, and IV) are not included with this draft. The
conditions are the same as in your current permit except that agency and division names have
been updated. The latest version is available at https://bit.ly/2BZ4xxx and can be viewed online
or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Orange County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days
after receipt of 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 this
draft permit, please call me at (919) 707-3610 or by email at Bing.Bai@ncdenr.gov.
Sincerely,
1�7
Bing Bai, Engineer
NPDES Complex Permitting Unit
cc: NPDES Files
Central Files
ec: US EPA Region 4
DWR/Raleigh Regional Office/Water Quality
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/Operator Certification Program/Maureen Kinney
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/PWSS Regional Engineer/Allen Hardy(include approval form)
Page 3 of 3
Permit NC0025241
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,
Orange Water and Sewer Authority
is hereby authorized to discharge wastewater from a facility located at the
Mason Farm WWTP
170 Old Mason Farm Road
Chapel Hill, North Carolina
Orange County
to receiving waters designated as Morgan Creek in the Cape Fear 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 Month XX, 20XX.
This permit and authorization to discharge shall expire at midnight on July 31, 2023.
Signed this day Month XX, 20XX.
Draft
Linda Culpepper,Director
Division of Water Resources
By Authority of the Environmental Management Commission
Permit NC0025241
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility,whether for operation or discharge are hereby revoked,and as
of this 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.
Orange Water and Sewer Authority is hereby authorized to:
1. Continue to operate an existing 14.5 MGD wastewater treatment facility consisting of the following
components:
• Influent screen
• Grit removal
• Primary clarifiers
• Aerobic/anoxic basins
• Secondary clarifiers
• Primary sludge fermenter
• UV disinfection system
• Anaerobic digester
• Gravity belt thickeners
• Sludge holding tank
The facility is located at the Mason Farm Wastewater Treatment Plant on 170 Old Mason Farm Road in
Chapel Hill,Orange County, and
2. Continue to operate a water reuse and distribution system to provide beneficial reuse of treated effluent from
the Mason Farm WWTP as conditioned in Non-Discharge Permit WQ0031506,and
3. Discharge from said treatment works via Outfall 001,at the location specified on the attached map into the
Morgan Creek, currently classified as WS-IV NSW water in subbasin 03-06-06 [HUC: 03030002] of the
Cape Fear River Basin.
Page 2 of 13
Permit NC0025241
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
Grade IV Biological WPCS [15A NCAC 08G .0302]
Beginning on the effective date of this permit and lasting until permit expiration,the Permittee is authorized to
discharge treated wastewater through Outfall 001. Such discharges shall be limited and monitored' by the
Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Parameter Code Monthly Weekly Daily Measurement Sample Sample Location
Average Average Maximum Frequency Type
Flow 50050 14.5 MGD Continuous Recording Influent or Effluent
Total Monthly Flow(MG) 82220 Monitor&Report Monthly Rec.or Calc. Influent or Effluent
BOD,5-day,20°C 2 3
(April 1 —October 31) 80082 4.0 mg/L 6.0 mg/L 2/Week Composite Influent and Effluent
BOD,5-day,20°C z 80082 8.0 mg/L 12.0 mg/L 2/Week 3 Composite Influent and Effluent
(November 1 —March 31)
Total Suspended Solids 2 C0530 30.0 mg/L 45.0 mg/L 2/Week 3 Composite Influent and Effluent
NH3 as N
(April 1 —October 31) C0610 1.0 mg/L 3.0 mg/L 2/Week 3 Composite Effluent
NH3 as N
(November 1 —March 31) C0610 2.0 mg/L 6.0 mg/L 2/Week 3 Composite Effluent
Fecal Coliform 31616 200/100 mL 400/100 mL 2/Week 3 Grab Effluent
(geometric mean)
pH 00400 Between 6.0 and 9.0 standard units Daily Grab Effluent
Dissolved Oxygen 00300 Daily Average not less than 6.0 mg/L Daily Grab Effluent
Temperature(°C) 00010 Daily Grab Effluent
Conductivity(µmohs/cm) 00094 Daily Grab Effluent
Total Residual Chlorine 4 50060 18 µg/L Daily Grab Effluent
Nitrate as N 00620 Monitor&Report(mg/L) Quarterly Composite Effluent
TKN 5 00625 Monitor&Report(mg/L) Weekly Composite Effluent
NO3-N+NO2-N 5 00630 Monitor&Report(mg/L) Weekly Composite Effluent
Total Nitrogen 5 C0600 Monitor&Report(mg/L) Weekly Composite Effluent
TN Load 6.7.8 QM600 Monitor&Report(lb/mo) Monthly Calculated Effluent
TN Load 6.7.8 QY600 134,375 lb/yr Annually Calculated Effluent
Total Phosphorus C0665 Monitor&Report(mg/L) Weekly Composite Effluent
TP Load 6.7,8 QM665 Monitor&Report(lb/mo) Monthly Calculated Effluent
TP Load 6'7'8 QY665 10,188 lb/yr Annually Calculated Effluent
Chronic Toxicity 9 TGP3B Quarterly Composite Effluent
Effluent Pollutant Scan NCO1 Monitor and Report Footnote 10 Footnote 10 Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see A. (10)].
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15%of the
respective influent value(85%removal).
Page 3 of 13
Permit NC0025241
3. 2/Week monitoring for BOD5,TSS,NH3-N,and fecal coliform for influent and effluent must occur on any two
non-consecutive days duringthe calendar week(Sundaythrough
ySaturday).
4. Total residual chlorine shall be monitored only if chlorine is added to the treatment process.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.
5. TN= TKN+NO3-N+NO2-N where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N+
NO2-N are Nitrate and Nitrite Nitrogen,respectively.
6. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of time. See
Special Condition A. (7)Calculation and Reporting of Nutrient Loads.
7. See Special Condition A. (5)Nutrient Allocations.
8. Compliance with mass limits shall be determined in accordance with Special Condition A.(6)Annual Limits
for Total Nitrogen or Total Phosphorus.
g P
9. Chronic Toxicity(Ceriodaphnia)limit at 90%with testing in February, May,August and November[See
Special Condition A.(3)].
10. The permittee shall perform three effluent pollutant scans during the term of this permit [see A. (4)].
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 13
Permit NC0025241
A. (2) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
Location' Measurement Frequency Parameters 2'3 SampSample
Type
1 Temperature
UPOctober-May Weekly Dissolved Oxygen
DN1 Conductivity
DN2 June- September 3/week Fecal Coliform
Total Phosphorous
UP 1 POa
DN1 June-September Once every 2 weeks NH3
DN2 Total Kjendahl
Nitrogen Grab
NOx
Temperature
Dissolved Oxygen
DN3 April-October Monthly a Conductivity
DN4 Fecal Coliform
Secchi depth
Chlorophyl-a
Footnotes:
1. Sample locations:
UP1 —Upstream location at Morgan Creek at the bridge at the plant entrance
DN1 —Downstream location#1 at Morgan Creek at the cement ford downstream of outfall
DN2—Downstream location#2 at Morgan Creek at the Farrington Road bridge
DN3—Downstream location#3 at Morgan Creek at the mouth of Morgan Creek
DN4 -Downstream Location#4 at Jordan Lake at the old railroad grade
2. Sampling of temperature and DO at the surface and one-meter intervals to a depth equal to the Secchi
depth. If the Secchi depth is less than 1.0 meters, sample at 0.5-meter intervals.
3. Instream sampling(Upstream and Downstream monitoring)is waived for all parameters as long as the
Permittee retains membership in the Upper Cape Fear River Basin Association (UCFRBA), which is
conducting a coordinated instream monitoring effort. If the Permittee's membership in the UCFRBA
is terminated, the Permittee must immediately notify the Division in writing, and the instream
monitoring requirements specified in this permit shall be reinstated immediately.
4. Monthly sampling at DN3 and DN4 should be separated at least two weeks within the appropriate month.
Page 5 of 13
Permit NC0025241
A. (3) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"Revised December 2010,or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"(Revised-December 2010)or
subsequent versions.The tests will be performed during the months of February,May,August and November.
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.
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-December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1) for the months in which tests were performed,using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3 (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, 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 Water 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. 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 final day of the third month.
Should any test data from this monitoring requirement 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,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.
Page 6 of 13
Permit NC0025241
A. (4) EFFLUENT POLLUTANT SCAN
[G.S. 143-215.1(b)]
The Permittee shall perform a total of three(3)Effluent Pollutant Scans for all parameters listed below. One scan must
be performed in each of the following years: 2020,2021,and 2022. Analytical methods shall be in accordance with
40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters are present in concentrations greater
than applicable standards and criteria. Samples should be collected with one quarterly toxicity test each year,and must
represent seasonal variation [i.e., do not sample in the same quarter every year]. 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-ethylhexyl)phthalate
Nitrate/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether
Kjeldahl nitrogen Ethylbenzene Butyl benzyl phthalate
Oil and grease Methyl bromide 2-chloronaphthalene
Phosphorus Methyl chloride 4-chlorophenyl phenyl ether
Total dissolved solids Methylene chloride Chrysene
Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1,1,1-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(EPA Method 1631E) P-chloro-m-cresol 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 manic 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-nitrosodimethylamine
Chloroethane Benzo(a)anthracene N-nitrosodiphenylamine
2-chloroethylvinyl ether Benzo(a)pyrene Phenanthrene
Chloroform 3,4 benzofluoranthene Pyrene
Dichlorobromomethane Benzo(ghi)perylene 1,2,4-trichlorobenzene
1,1-dichloroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis(2-chloroethoxy)methane
Reporting. Test results shall be reported on DWR Form-A MR-PPA1 (or in a form approved by the Director)by
December 31 s►of each designated sampling year. The report shall be submitted to the following address: NC DEQ
/DWR/Central Files,1617 Mail Service Center,Raleigh,North Carolina 27699-1617.
Page 7 of 13
Permit NC0025241
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal facilities
that are subject to the Effluent Pollutant Scan requirements listed above are also to additional ona toxicity
subject
testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5). The US EPA requires four(4)toxicity
tests for a test organism other than the test species currently required in this permit The multiple species tests
should be conducted either quarterly for a 12-month period prior to submittal of the permit renewal application,or
four tests performed at least annually in the four and one half year period prior to the application. These tests shall
be performed for acute or chronic toxicity,whichever is specified in this permit. The multiple species toxicity test
results shall be filed with the Aquatic Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Contact the Division's Aquatic ToxicologyBranch at 919-743-8401 for gu
idance o gu dance on conducting the additional
toxicity tests and reporting requirements. Results should also be summarized in Part E(Toxicity Testing Data)of
EPA Municipal Application Form 2A,when submitting the permit renewal application to the NPDES Permitting
Unit.
A. (5) NUTRIENT ALLOCATIONS
[15A NCAC 02B .0270]
(a.)The following table lists the Total Nitrogen(TN)and Total Phosphorus(TP)allocations assigned to,acquired
by,or transferred to the Permittee in accordance with the Jordan Lake nutrient management rule(T15A
NCAC 02B .0270)and the status of each as of permit issuance. For compliance purposes,this table does not
supersede any TN or TP limit established elsewhere in this permit or in the NPDES permit of a compliance
association of which the Permittee is a Co-Permittee Member.
Total Nitrogen Allocation
ALLOCATION ALLOCATION AMOUNT(1)
TYPE SOURCE DATE STATUS
Delivered(Ib/yr) Discharge(Ib/yr)
Base Assigned by Rule Rule 84,656 134,375 Active
(T15A NCAC 02B .0270) 8/11/09
TOTAL 84,656 134,375 Active
Footnote:
(1) Nitrogen Transport Factor= 63%
Total Phosphorus Allocation
ALLOCATION ALLOCATION AMOUNT(1)
TYPE SOURCE DATE STATUS
Delivered(lb/yr) Discharge(Ib/yr)
Base Assigned byRule 8/11/09 4,789 10,188 Active
9
(T15A NCAC 02B .0270)
TOTAL 4,789 10,188 Active
Footnote:
(1) Phosphorus Transport Factor 47%
(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 under state and federal rules.
Page 8 of 13
Permit NC0025241
A. (6) ANNUAL LIMITS FOR TOTAL NITROGEN OR TOTAL PHOSPHORUS
[G.S. 143-215.1(b)]
(a.) Total Nitrogen(TN) and Total Phosphorus(TP)allocations and load limits for NPDES dischargers in the
Jordan Lake watershed are annual limits and apply on a calendar year basis.
(b.) For any given calendar year,the Permittee shall be in compliance with the annual TN(or TP) Load limit in
this Permit if:
(i.) the Permittee's annual TN(or TP)Load is less than or equal to the effective limit,or
(ii.) the Permittee is a Co-Permittee Member of a compliance association.
(c.) If the Permittee is not a co-permittee member of a compliance association and the Permittee's cumulative
annual TN discharge exceeds the effective TN Load limit in this permit at any point during the calendar year,
the Permittee is in violation of its TN Load limit, and each day of a continuing violation shall constitute a
separate violation.
(d.) The TN(or TP)Load limit in this Permit may be modified as the result of allowable changes in the
Permittee's allocations.
(i.) Allowable changes include those resulting from purchase of TN(or TP)allocation from an authorized
mitigation banker,the Ecosystem Enhancement Program, or other source allowed under applicable
regulations; 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(or TP) Load limit in this Permit to reflect
allowable changes in its allocation(s).
(A) Upon receipt of timely and proper application,the Division will modify the permit as appropriate
and in accordance with state and federal program requirements.
(B) Changes in TN(or TP) 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.
(iii.) Any requests for modification should be sent to:
NCDEQ/Division of Water Resources
NPDES Complexing Permitting
1617 Mail Service Center
Raleigh,NC 27699-1617
(e.) If the Permittee is a member and co-permittee of an approved compliance association on January 1 of a given
year, its TN and TP discharges during that year are governed by that association's group NPDES permit and
the 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 and TP allocations will be updated annually and in accordance
with state and federal program requirements.
(iii.) If the Permittee intends to join or leave a compliance association,the Division must be notified of the
proposed action in accordance with the procedures defined in the association's NPDES permit.
(A) Upon receipt of timely and proper notification,the Division will modify the permit as appropriate
and in accordance with state and federal program requirements.
(B) Membership changes in a compliance association become effective on January 1 of the year
following modification of the association's permit.
(f.) The TN and TP monitoring and reporting requirements in this Permit remain in effect throughout the term of
the Permit and are not affected by the Permittee's membership in a compliance association.
Page 9 of 13
Permit NC0025241
A. (7) CALCULATION OF TOTAL NITROGEN OR TOTAL PHOSPHORUS LOADS
[G.S. 143-215.1(b)]
(a) The Permittee shall calculate monthly and annual TN and TP Loads as follows:
(i.) Monthly TN(or TP)Load(lb/mo)=TN(or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorus concentration(mg/L)of the
composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the month(MG/mo)
8.34 = conversion factor, from(mg/L x MG)to pounds
(ii.) Annual TN(or TP) Load(lb/yr)= Sum of the 12 Monthly TN(or TP)Loads for the calendar year
(b) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results(mg/L and lb/mo)in the
appropriate discharge monitoring report for each month and shall report each calendar year's results(lb/yr)
with the December report for that year. The reported loads should be labeled and identified accordingly.
A. (8) NUTRIENT MONITORING RE-OPENER
[G.S. 143-215.1(b)]
Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in Title 15A of
the North Carolina Administrative Code, Subchapter 02H, specifically, 15A NCAC 02H.0112(b)(1)
and 02H.0114(a), and Part II, Sections B.12. and B.13. of this Permit, the Director of DWQ may
reopen this permit to require supplemental nutrient monitoring of the discharge. The additional
monitoring will be to support water quality modeling efforts within the Cape Fear River Basin, and
shall be consistent with a monitoring plan developed jointly by the Division and affected stakeholders.
A. (9) MERCURY MINIMIZATION PLAN
[G.S. 143-215.1(b)]
The permittee shall develop and implement a mercury minimization plan during this permit term. The MMP shall
be developed within 180 days of the NPDES Permit Effective Date, and shall be available for inspection on-site. A
sample MMP was developed through a stakeholder review process and has been placed on the Division website for
guidance(http://deq.nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-
wastewater-permits,under Model Mercury Minimization Plan). The MMP should place emphasis on identification
of mercury contributors and goals for reduction. Results shall be summarized and submitted with the next permit
renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL(Total
Maximum Daily Load) for mercury approved by USEPA on October 12, 2012,unless and until a Waste Load
Allocation specific to this facility is developed and this NPDES permit is amended to require further actions to
address the Waste Load Allocation.
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Permit NC0025241
A. (10) ELECTRONIC REPORTING OF MONITORING REPORTS
[G.S. 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 Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
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:
• 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).
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Permit NC0025241
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:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/nati oval-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:
http://deq.ric. ov/about/divisions/water-resources/edmr
4. Signatory Requirements (Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
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.
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://deq.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:
"I cert j, 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
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Permit NC0025241
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 offines 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 13 of 13
Permit NC0025241
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Facility Location
State Grid/Quad: D22NE Chapel Hill Latitude: 35'53'43"N not to scale
County: Orange Longitude: 79°01'26"W
Receiving Stream: Morgan Creek Drainage Basin: Cape Fear NPDES Permit No. NC00252.11
stream Class: WS-IV,NSW Sub-Basin HI C: 03-06-06'03030002 North
Orange County