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MICHAEL S.REGAN ` �� ,
Secretaryowovo
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
October 2, 2019
Ms. Bettie J. Parker
Mayor
City of Elizabeth City
PO Box 347
Elizabeth City,North Carolina 27907
Subject: Draft NPDES Permit Renewal
Permit NC0025011
Elizabeth City WWTP
Pasquotank County
Grade IV Biological WPCS
SIC Code 4952
Dear Ms. Parker:
Based on comments received from the City of Elizabeth City and further NPDES review, the
following changes were made to the draft permit sent to you on July 8, 2019:
• For the draft permit sent on July 8, 2019, the RPA was conducted without accounting for
the 10:1 dilution granted the facility based on the 1994 PLUMES model. This has been
revised. After said revision, monitoring for zinc and bromodichloromethane has been
removed from the permit. The total copper limit has been removed and its monthly
monitoring requirement has been reduced to a quarterly frequency. The limit for total
cyanide remains in the permit [See A.(1.)].
Given these significant changes,the Division has decided to re-public notice this draft permit. As
recognized below,the City will have additional time to comment on these changes.
More detailed responses to your comments on the draft sent on July 8, 2019 are attached in the
Fact Sheet Addendum following this letter. Enclosed with this letter is a copy of the Draft NPDES
permit renewal for your facility. This draft permit maintains the same changes as identified in the
original draft cover letter sent on July 8, 2019:
• Based on the reasonable potential analysis (RPA) showing reasonable potential to violate
state water quality standards,total cyanide limits have been added to the permit and the
quarterly monitoring requirement has been changed to monthly monitoring [See A.(1)].
• The Division concurs with your comment. Chronic toxicity testing shall continue to be
conducted at 10%effluent on a quarterly basis. A dilution model or technical
documentation will be required upon expansion of the Elizabeth City WWTP.
• To provide an opportunity for the City to develop a plan to assess sources of total cyanide
in order to come in compliance with the limits in Section A. (1.), a 3-year schedule of
D_E ) North Carolina Department of Environmental Quality I Division of Water Resources
ra0aT Gno4iN
vvv 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
os.r....••Emiranwortal ouwr jelle6d 919.707.9000
compliance has been added to the permit [See Special Condition A. (5.) Schedule of
Compliance for Total Cyanide Limitations].
• Based on Mercury TMDL evaluation showing all reported mercury values at levels < 1
ng/L, Special Condition A. (5.)Mercury Minimization Plan(MMP) has been removed
from the permit.
• Based on DWR Instream Conductivity and Fecal Coliform Monitoring Guidance,the
facility discharges 100% domestic wastewater so instream conductivity monitoring has
been removed from the permit [See A.(1.)].
• The facility components list has been updated to include the two clarifiers, grit
dewatering screw and gravity belt thickener in use at the facility.
• The City of Elizabeth City reported Total Nickel, and Total Silver at less than detection,
with detection levels< 10 µg/L, and<5 µg/L respectively, in the Effluent Pollutant
Scans. The City's allowable discharge concentrations are 8.30 µg/L and 0.10 µg/L for
Total Nickel and Total Silver, respectively. DWR's laboratory identifies the target
Practical Quantification Limits(PQLs) for Total Nickel and Total Silver as 2 µg/L, and 1
µg/L, respectively. 15A NCAC 2B .0505 (e) (4)requires that 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. If no approved methods are capable of achieving a detection level
below the permit discharge requirement(or allowable concentration)the method with the
lowest detection level must be used. The City should use sufficiently sensitive test
methods for all pollutants, including when performing Effluent Pollutant Scans.
• 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 Scan shall be performed (2020, 2021, and 2022). In addition, at the
end of the Special Condition, 2"a species Toxicity Testing Requirements for municipal
permit renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added.
• 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 added to your NPDES permit[See Special Condition A. (6.)].
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
[ See A. (1.)].
• Language has been added to Footnote 1 to account for influent, effluent, upstream and
downstream abbreviations [See A. (1.)].
• Regulatory citations have been added to the permit.
The NPDES Standard Conditions(Parts II, III, and IV)are not included with this draft. 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 Pasquotank 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.
Page 2 of 3
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) 707-3609 or by email at nick.coco@ncdenr.gov.
Sincerely,
Nick Coco, Engineer
Division of Water Resources,NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
DWR/Washington Regional Office/Water Quality/Robert Tankard
DWR/Operator Certification Program/Maureen Kinney
DWR/Aquatic Toxicology Branch/Susan Meadows
City of Elizabeth City WWTP/ORC/Rebecca Miller
City of Elizabeth City/Public Utilities Director/Amanda Boone
r
Page 3 of 3
Fact Sheet Addendum
The Division received comments from the City of Elizabeth City on August 2, 2019 and
provides the following responses:
1. Comment: Please update the address to reflect our current mayor: Bettie J. Parker.
Response: The change will be reflected in the next draft and final permit.
2. Comment: The City of Elizabeth City is calling into question the Reasonable Potential
Analysis(RPA) and subsequently objects to any monitoring requirements and/or permit limits
specifically those for Copper, Cyanide, Zinc and Bromodichloromethane based on the findings
within the RPA.
a. The RPA specifies an IWC equal to 100%. This is contradictory to our actual flow as
compared to that of the Pasquotank River. This is also contradictory to what is
utilized in our Toxicity Testing.
b. Similarly,we question the 7Q10 flow used in the RPA. The"Facility Information"
spreadsheet on NC DEQ's website list the 7Q10 flow as zero. This is incorrect. What
was used in the RPA?
c. We request confirmation that the stream classification is indeed"SC."We raise this
concern because, again in the"Facility Information"spreadsheet on NC DEQ's
website,the current classification is listed as"WS-V Sw."
d. The RPA assumes our receiving water body to be saltwater. However,the Pasquotank
River is brackish. This is supported by the salinity levels previously required to be
used in our toxicity testing.
e. The BDL values for Total Phenolic Compounds and Cyanide appear to be in error, as
they are not one-half of the DL.
f. Elizabeth City requests to review the electronic version of the RPA to be satisfied
with calculations. Unfortunately,this is the first time we have been provided with the
RPA during the course of the permit writing.
Response:
a. The RPA was not conducted using the 10:1 dilution. This has been revised. After said
revision,monitoring for zinc and bromodichloromethane has been removed from the
permit. The total copper limit has been removed and its monthly monitoring
requirement has been reduced to a quarterly frequency. The limit for total cyanide
remains in the permit.
b. As no background concentration is assumed for the parameters in the RPA, each
allowable discharge concentration is equal to the applicable NC Water Quality
Standard or federal criteria times a dilution factor. The 7Q10 is not utilized in the
revised RPA. I have attached the NPDES Implementation of Instream Dissolved
Metals Standards—Saltwater Standards for your reference.
c&d. The stream segment to which the Elizabeth City WWTP discharges has been
classified by the Division as SC waters. I have attached the Classification Schedule
for your reference.
e. All CN values less than 10 ug/L are given a value of 5 so no variation occurs if all the
values are 10 or less. The same goes for Total Phenolic Compounds.
f. I have sent an electronic copy of the Reasonable Potential Analysis spreadsheet to
Amanda Boone(Public Utilities Director) and Rebecca Miller(WWTP ORC). Please
note that the Division does not typically share this file with Permittees. The file is for
review of this permit and this facility only, and is not to be altered. Do not share this
file with others, as sufficient protections do not exist within the spreadsheet to prevent
altering of equations used to calculate allowable discharge concentrations or
maximum predicted values.
3. Comment: The salinity concentration for Chronic Toxicity Testing appears to have been
removed. Was this intentional?.
Response: After discussion with the Division's Aquatic Toxicology Branch, the salinity
concentration specification was removed from the Chronic Toxicity special condition language
as it is a component of EPA Method 1007.0 and specification within the permit is not necessary.
AT&
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
Memorandum
To: NPDES Permit Writers
Thru: Jeff Poupart
From: Tom Belnic
Date: July 15, 2010C
Re: Monitoring Frequency for Toxic Substances
The following guidance will provide for more consistent determinations of monitoring frequency for NPDES
permitting. The monitoring frequencies listed below are consistent with several Region 4 States, and will
provide sufficient data to perform reasonable potential analysis(RPA) at permit renewal. This guidance
pertains to toxic substances(e.g., metals, cyanide, carcinogens)that have corresponding water quality
standards/criteria that provide for RPA evaluation. This guidance is not applicable for TRC or NH3, which are
toxicants but are not subject to RPA analysis and already have monitoring frequencies defined in 15A NCAC
2B.0500(Surface Water Monitoring). Permit writers should continue to use all available toxicant data(LTMP,
PPA, DMRs)to conduct RPA evaluation.
Effective immediately, this guidance for monitoring frequency should be followed for permit development.
However, there will undoubtedly be the need for some case-by-case decisions(e.g.,toxicants with TMDL,
reduced monitoring for New Permits following data collection/RPA evaluation). Permit writers should discuss
such exceptions with the NPDES Unit Supervisors. Monitoring frequency can also be increased for non-
compliance.
RPA Condition Permit Monitoring Frequency
1.RPA Exists Monitor Monthly and add Permit Limit
2.RPA Exists but Action Levels(Cu, Zn, Ag,Fe, Cl) Monitor Quarterly in conjunction with Tox Test
3a.RPA Exists but Dataset Limited(n< 8 samples) Monitor Quarterly
3b. RPA exists, dataset limited,but 2 values> Monitor Monthly and add Permit Limit
allowable Cw
4.No RPA(Predicted Max >50%of Allowable) Monitor Quarterly(or defer to Pretreat LTMP)
5.No RPA (Predicted Max<50%Allowable) No Monitoring
6a.No Data(New Permit,New Waste Stream) Monitor Monthly for Toxic Pollutants of Concern
6b. New Greensand or Conventional WTP Monitor Quarterly for Toxic Pollutants of Concern
1617 Mail Service Center Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh.North Carolina 27604 One
Phone:919-807-6300\FAX:919.807-6492 I Customer Service:1-877-623-6748 North Carolina
Internet:www.ncwaterquality.org Naturally
An Equal Opportunity i Affirmative Action Employer
Permit NC0025011
NPDES Implementation of Instream Dissolved Metals Standards—Saltwater Standards
The NC 2007-2015 Water Quality Standard(WQS)Triennial Review was approved by the NC
Environmental Management Commission(EMC)on November 13,2014. The US EPA subsequently
approved the WQS revisions on April 6,2016,with some exceptions.Therefore,metals limits in draft
permits out to public notice after April 6,2016 must be calculated to protect the new standards-as
approved.
Table 1.NC Dissolved Metals Water Quality Standards/Aq atic Life Protection
Parameter Acute FW, µg/1 Chronic FW, µg/1 Acute SW, µg/1 Chronic SW, µg/1
(Dissolved) (Dissolved) (Dissolved) (Dissolved)
Arsenic 340 150 69 36
Beryllium 65 6.5 ---
Cadmium Calculation Calculation 40 8.8
Chromium III Calculation Calculation ---
Chromium VI 16 11 1100 50
Copper Calculation Calculation 4.8 3.1
Lead Calculation Calculation 210 8.1
Nickel Calculation Calculation 74 8.2
Silver Calculation 0.06 1.9 0.1
Zinc Calculation Calculation 90 81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation=Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns(as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
2B.0200(e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards.However, application of
the dissolved metal standards requires additional consideration in order to establish the numeric standard
for each metal of concern of each individual discharge.Note that none of the saltwater standards are
hardness-dependent.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c).The
discharge-specific standards must be converted to the equivalent total values for use in the RPA
calculations.We will generally rely on conversion factors determined by EPA(more on that below),but it
is also possible to consider case-specific translators developed in accordance with established
methodology.
RPA Permitting Guidance—Discharges to Saltwater (Tidal waters)
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data,and calculate the allowable effluent concentrations,based on applicable
standards and the stream dilution.For discharges to saltwater,no allowance for dilution is given unless a
dilution study, such as a CORMIX model, is performed.
If the maximum predicted value is greater than the maximum allowed value(chronic or acute),the
discharge has reasonable potential to exceed the standard,which warrants a permit limit in most cases.If
monitoring for a particular pollutant indicates that the pollutant is not present(i.e.consistently below
detection level),then the Division may remove the monitoring requirement in the reissued permit.
Page 1 of 3
Permit NC0025011
1. To perform a RPA using the saltwater dissolved metal standards,the Permit Writer compiles the
following information:
• Permitted flow
• Receiving stream classification
• Instream Wastewater Concentration, if a dilution model has been performed
2. The RPA spreadsheet converts the dissolved numeric standard(SW standards listed in Table 1.)
for each metal of concern to a total recoverable metal,using the EPA conversion factors
published in the June, 1996 EPA Translator Guidance Document. This method presumes that the
metal is dissolved to the same extent as it was during EPA's criteria development for metals.
Conversion Factors for Dissolved Metals
Metal Saltwater CMC Saltwater CCC
(Acute) (chronic)
Arsenic 1.000 1.000
Cadmium 0.994 0.994
Chromium VI 0.993 0.993
Copper 0.83 0.83
Lead 0.951 0.951
Mercury 0.85 0.85
Nickel 0.990 0.990
Selenium 0.998 0.998
Silver 0.85 —
Zinc 0.946 0.946
From: US EPA website, National Recommended Water Quality
Criteria-Aquatic Life Criteria Table
https://www.epa.eov/wgc/national-recommended-water-
quality-criteria-aquatic-life-criteria-table#a
3. The dissolved numeric standard for each metal of concern is divided by the EPA conversion
factor(or site-specific translator)to obtain a Total Recoverable Metal at ambient conditions.
4. If a dilution study was performed on the receiving stream and an Instream Wastewater
Concentration(IWC)determined the RPA spreadsheet uses a mass balance equation to determine
the total allowable concentration(permit limits) for each pollutant using the following equation:
Ca=(s7Q10+Qw)(Cwqs)—(s7Q10) (Cb)
Qw
Where: Ca=allowable effluent concentration(µg/L or mg/L)
Cwqs=NC Water Quality Standard or federal criteria(µg/L or mg/L)
Cb=background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw=permitted effluent flow (cfs,match 7Q 10 units)
s7Q10= summer, critical low flow(cfs)
* Discussions are on-going with EPA on how best to address background concentrations
Assuming no background concentration,this equation can be reduced to:
�' q
Ca= (s7Q10+Ow)(Cwqs) or Ca = Cwqs
Qw IWC
Page 2 of 3
Permit NC0025011
Where: IWC = Ow _ or 1
Qw+s7Q 10 D
and D= modelled dilution factor(unitless)
If no dilution study has been performed Ca,the allowable effluent concentration,is equal to the
q
Total Recoverable Metal determined at ambient conditions(ie.the dissolved numeric standard
divided by the EPA conversion factor(or site-specific translator)for the metal of concern). See
item#3 above.
5. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half prior rior to the date of the permit
years
application(40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations,the discharge is considered to show
reasonable potential to violate the water quality standard,and a permit limit(Total allowable
concentration)is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality-Based Toxics Control published in 1991.
6. When appropriate,permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10,2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
7. The Total Chromium NC WQS was removed and replaced with a hexavalent chromium standard.
As a cost savings measure,total chromium data results may be used as a conservative surrogate in
cases where there are no analytical results based on chromium VI. In these cases,the projected
maximum concentration(95th%)for total chromium will be compared against the water quality
standard chromium VI.
Page 3 of 3
NC DENR-DIVISON OF WATER RESOURCES 2B.0300
.0317 PASQUOTANK RIVER BASIN
Name of Stream Description Class Class Date Index No.
Duck Creek From source to North River SC 04/06/61 30-2-13
Broad Creek From source to North River SC 04/06/61 30-2-14
Little Broad Creek From source to North River SC 04/06/61 30-2-15
Pasquotank River From source to a point 1.7 mile WS-V;Sw 08/01/98 30-3-(1)
upstream of mouth of Turners Cut
Newland Drainage Canal From source to Pasquotank River C;Sw 09/01/74 30-3-1.5
Dismal Swamp Canal From North Carolina-Virginia State C;Sw 08/01/98 30-3-2
Line to Pasquotank River 1
Hamburg Ditch(Cross Canal) From source to Dismal Swamp Canal C;Sw 09/01/74 30-3-2-1 I
Corapeake Swamp(Jones From North Carolina-Virginia State C;Sw 09/01/74 30-3-2-1-1
Millpond) Line to Hamburg Ditch
Taylor Swamp From source to Corapeake Swamp C;Sw 09/01/74 30-3-2-1-1-1
Folly Swamp From source to Hamburg Ditch C;Sw 09/01/74 30-3-2-1-2
Goose Creek From source to Hamburg Ditch C;Sw 09/01/74 30-3-2-1-3
Jones Pond Entire pond and connecting stream C;Sw 09/01/74 30-3-2-1-4
to Hamburg Ditch
Sherrill Ditch From Corapeake Ditch to Hamburg C 03/01/77 30-3-2-1-5
Ditch
Southwest Ditch From source to Hamburg Ditch C;Sw 09/01/74 30-3-2-1-6
Northwest Ditch From source to Hamburg Ditch C;Sw 09/01/74 30-3-2-1-7
Reddick Ditch From North Carolina-Virginia State C;Sw 09/01/74 30-3-2-1-7-1
Line to Northwest Ditch
Corapeake Ditch From source to Reddick Ditch C 03/01/77 30-3-2-1-7-1-1
Joyce Creek From source to Dismal Swamp Canal C;Sw 08/01/98 30-3-2-2
Pasquotank River From a point 1.7 mile upstream of WS-IV;Sw 08/01/98 30-3-(3)
mouth to Turners Cut to a point 0.6
mile upstream of Pasquotank County
SR 1368 extension
Turners Cut From Dismal Swamp Canal to a point C;Sw 08/01/98 30-3-4-(1)
1.2 miles upstream of mouth
Turners Cut From a point 1.2 miles upstream of WS-IV;Sw 08/01/98 30-3-4-(2)
mouth to Pasquotank River
Cooper Creek From source to Pasquotank River WS-IV;Sw 08/03/92 30-3-4.5
Pasquotank River From a point 0.6 mile upstream of WS-IV;Sw,CA 08/03/92 30-3-(5)
Pasquotank County SR 1368
extension to Elizabeth City water
supply intake
Pasquotank River From Elizabeth City water supply C;Sw 04/06/61 30-3-(5.5)
intake located at the extension of
Pasquotank County SR 1368 to
Norfolk-Southern Railroad Bridge
Sawyers Creek From source to Pasquotank River C;Sw 07/01/73 30-3-6
Pasquotank River From Norfolk-Southern Railroad SC 04/06/61 30-3-(7)
Bridge to a line across the River from
Hospital Point to Cobb Point
Knobbs Creek From source to Pasquotank River C;Sw 09/01/74 30-3-8
Poindexter Creek From source to Pasquotank River C;Sw 01/01/85 30-3-9
3
Saltwater RPA 95% Probablity/95% Confidence
MAXIMUM DATA POINTS=58
REQUIRED DATA ENTRY
Table 1. Project Information Table 2. Parameters of Concern
❑CHECK IF HQW OR ORW WQS E Name WQS Type Chronic Modifier Acute PQL Units
Facility Name Elizabeth City WWTP Par01 Arsenic Aquatic Life C 36 SW 69 ug/L
WWTP/WTP Class IV ParO2 Arsenic Human Health C 10 HH ug/L
NPDES Permit NC0025011 Par03 Cadmium Aquatic Life NC 8.9 SW 40.2 ug/L
Outfall 001 Par04 Total Phenolic Compounds Aquatic Life NC 300 A 10 ug/L
Flow,Qw(MGD) 4.500 Paros Chromium VI Aquatic Life NC 50.4 SW 1107.8 ug/L
Receiving Stream Pasquotank River Par06 Chromium,Total Aquatic Life NC N/A SW N/A ug/L
Stream Class SC Par07 Copper Aquatic Life NC 3.7 SW 5.8 ug/L
7Q10s(cfs) Modeled,Chronic Dilution Factor defined Par08 Cyanide Aquatic Life NC 1 SW 1 10 ug/L
7Q1Ow(cfs) -Mode and r - Paros Lead Aquatic Life NC 8.5 SW 220.8 ug/L
30Q2(cfs) Modeled,Chronic Dilution Factor defined Par10 Mercury Aquatic Life NC 25 SW 0.5 ng/+-
QA(cfs) ; Modeled,Chronic Dilution Factor defined I Par11 Molybdenum Human Health NC 2.0 HH mg/L
1 Q10s(cfs) Modeled,Chronic Dilution Factor defined j Par12 Nickel Aquatic Life NC 8.3 SW 74.7 ug/L
CHRONIC IWC%=10 Par13 Selenium Aquatic Life NC 71 SW ug/L
CHRONIC DILUITION FACTOR=1 10.0000 Par14 Silver Aquatic Life NC 0.1 SW 2.2 ug/L
Data Source(s) ;DMRs April 2013-September 2018 Par15 Zinc Aquatic Life NC 85.6 SW 95.1 ug/L
;Effluent Pollutant Scans 2014,2015 Parts Bromodichloromethane Human Health C 27 SW pg/L
To apply a Model IWC%:Enter Dilution based off 1994 PLUMES model @ 10:1
the"Flow. Qw, (Mt;D)"and the
centerline diffuser Par17
"CHRONIC DILUTION FACTOR Par18
_"values and the CHRONIC resulting
Saltwater streams are tidal r in a11 lWC%=100%. Parts
IWC% is calculated and If an approved model is conducted then a chronic dilution
displayed. The CHRONIC IWC% factor is determined and can beto a discharge to Par2o
applied
is automatically applied to9
calculate the parameter's i calculate its IWC%.If a stream is classified as a SA or Par21
Allowable Cw values both chronic j ORW then its is also classified as a HOW. The appropriate Par22
and acute. 1IWC%must be defined to properly calculate WQS-based
;limits. NOTE:The aquatic life chronic and acute WQS for several metals are calculated based on EPA convers
see"Diss. SW stds.As TM"for more details and summary of calculated WQS..
RPA EC with modeled dilution,input
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0009'Z uean 9'Z 9 > 4LOZ/£/L Z 0000'9 uean 9 9 > 41OZ/4l/L Z
0000'0 'Aaa P4S 9'Z 9 > £LOZ/£/S L 0000'0 '"ea MS 9 Z > ELOZ/LZ/4 L
MIIIIMMINsllnse I IaZIL=log ewa a;ea s;Ins021 1aZ11=lag e;ea owa
gg=s;uiod
elep wnw!xevy
..Ad0�..uay;„san�eA Ielo1`wnlwoJy3 spunodwoo ollouayd lelol
viva - SISA1VNV 11dL1N31Od 319VNOSV321
REASONABLE POTENTIAL ANALYSIS - DATA
Co er Values"then"CO C anide Values'then"COPY"
PP .Maximum data y .Maximum data
points=58 points=58
Date Data BDL=I/2DL Results Date Data BDL=1/2DL Results •
1 4/5/2013 < 10 5 Std Dev. 2.5763 1 4/5/2013 < 5 5 Std Dev. 2.0788
2 5/6/2013 < 10 5 Mean 5.2857 2 4/30/2013 < 5 5 Mean 5.3929
3 7/19/2013 < 10 5 C.V. 0.4874 3 7/19/2013 < 5 5 C.V. 0.3855
4 8/2/2013 < 10 5 n 28 4 8/2/2013 < 5 5 n 28
5 11/15/2013 < 10 5 5 11/15/2013 < 5 5
6 2/7/2014 < 10 5 Mult Factor= 1.1900 6 2/7/2014 < 5 5 Mult Factor= 1.1500
7 5/9/2014 < 10 5 Max.Value 18.00 ug/L 7 5/9/2014 < 5 5 Max.Value 16.0 ug/L
8 7/3/2014 < 10 5 Max.Pred Cw 21.42 ug/L 8 7/10/2014 < 5 5 Max.Pred Cw 18.4 ug/L I
9 8/1/2014 < 10 5 9 8/1/2014 < 5 5 I
10 11/7/2014 < 10 5 10 11/7/2014 < 5 5
11 2/6/2015 < 10 5 11 2/6/2015 < 5 5
12 5/1/2015 < 10 5 12 5/1/2015 < 5 5
13 8/5/2015 < 10 5 13 8/5/2015 < 5 5
14 8/21/2015 < 10 5 14 8/24/2015 < 5 5
15 11/6/2015 < 10 5 15 11/6/2015 < 5 5
16 2/5/2016 18 18 16 2/5/2016 < 5 5
17 5/6/2016 < 10 5 17 5/6/2016 < 5 5
1 18 7/25/2016 < 10 5 18 7/21/2016 < 5 5
19 8/5/2016 < 10 5 19 8/5/2016 < 5 5
20 11/4/2016 < 10 5 20 11/4/2016 < 5 5
21 2/3/2017 < 10 5 21 2/3/2017 < 5 5
22 5/5/2017 < 10 5 22 5/5/2017 < 5 5
23 5/15/2017 < 10 5 23 5/16/2017 < 5 5
24 8/4/2017 < 10 5 24 8/4/2017 < 5 5
25 11/3/2017 < 10 5 25 11/3/2017 < 5 5
26 2/9/2018 < 10 5 26 2/9/2018 < 5 5
27 4/4/2018 < 5 2.5 27 4/4/2018 < 8 5
28 7/2/2018 < 5 2.5 28 7/2/2018 16 16
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
RPA EC with modeled dilution,data
Date)
REASONABLE POTENTIAL ANALYSIS - DATA
Lead Values"then•COPY" Nickel Values"then"COPY"
.Maximum data .Maximum data
points=58 into=58
Date Data BDL=1/2DL Results Date Data BDL=I/2DL Results
1 5/7/2013 < 5 2.5 Std Dev. 0.0000 1 5/6/2013 < 10 5 Std Dev. 0.0000
2 7/11/2014 < 5 2.5 Mean 2.5000 2 7/3/2014 < 10 5 Mean 5.0000
3 8/21/2015 < 5 2.5 C.V.(default) 0.6000 3 8/21/2015 < 10 5 C.V.(default) 0.6000
4 7/22/2016 < 5 2.5 n 5 4 7/25/2016 < 10 5 n 5
5 5/16/2017 < 5 2.5 5 5/15/2017 < 10 5
6 Mult Factor= 2.32 6 Mult Factor= 2.3200
7 Max.Value 2.50 ug/L 7 Max.Value 5.00 ug/L
8 Max.Pred Cw 5.80 ug/L 8 Max.Pred Cw 11.6 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
RPA EC with modeled dilution,data
Date}
REASONABLE POTENTIAL ANALYSIS - DATA
Selenium Values"then "! "COPY"
.Maximum data
let
Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=112DL Results
1 5/3/2013 < 10 5 Std Dev. 0.0000 1 5/3/2013 < 5 2.5 Std Dev. 0.0000
2 7/7/2014 < 10 5 Mean 5.0000 2 7/3/2014 < 5 2.5 Mean 2.5000
3 8/26/2015 < 10 5 C.V.(default) 0.6000 3 8/21/2015 < 5 2.5 C.V.(default) 0.6000
4 7/28/2016 < 10 5 n 5 4 7/25/2016 < 5 2.5 n 5
5 5/12/2017 < 10 5 5 5/15/2017 < 5 2.5
6 Mult Factor= 2.3200 6 Mult Factor= 2.3200
7 Max.Value 5.0 ug/L 7 Max.Value 2.50 ug/L
8 Max.Pred Cw 11.6 ug/L 8 Max.Pred Cw 5.80 ug/L
9 9
10 10 1
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29 I
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
RPA EC with modeled dilution,data
Date)
REASONABLE POTENTIAL ANALYSIS - DATA
Zinc Values"then"COPY" Bromodichloromethane Values"then"COPY"
.Maximum data _ .Maximum data
pts=58 • olnt =58
Date Data BDL=1/2DL Results oin mim Date Data BDL=1/2DL Results
1 4/5/2013 23 23 Std Dev. 13.3100 1 5/6/2013 7.4 7.4 Std Dev. 5.8209
2 5/8/2013 30 30 Mean 28.3214 2 7/3/2014 18.2 18.2 Mean 14.1600
3 7/19/2013 28 28 C.V. 0.4700 3 8/21/2015 18.1 18.1 C.V.(default) 0.6000
4 8/2/2013 22 22 n 28 4 7/25/2016 18.9 18.9 n 5
5 11/15/2013 35 35 5 5/15/2017 8.2 8.2
6 2/7/2014 11 11 Mult Factor= 1.1800 6 Mult Factor= 2.3200
7 5/9/2014 18 18 Max.Value 72.0 ug/L 7 Max.Value 18.90000 pg/L
8 7/3/2014 31 31 Max.Pred Cw 85.0 ug/L 8 Max.Pred Cw 43.84800 pg/L
9 8/1/2014 52 52 9
10 11/7/2014 27 27 10
11 2/6/2015 42 42 11
12 5/1/2015 < 10 5 12
13 8/5/2015 40 40 13
14 8/21/2015 38 38 14
15 11/6/2015 27 27 15
16 2/5/2016 72 72 16
17 5/6/2016 25 25 17
18 7/25/2016 20 20 18
19 8/5/2016 27 27 19
20 11/4/2016 17 17 20
21 2/3/2017 23 23 21
22 5/5/2017 21 21 22
23 5/15/2017 18 18 23
24 8/4/2017 38 38 24
25 11/3/2017 20 20 25
26 2/9/2018 24 24 26
27 4/4/2018 18.6 18.6 27
28 7/2/2018 40.4 40.4 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
RPA EC with modeled dilution,data
Date)
Elizabeth City VVVVTP Outfall 001
NC0025011 Saltwater RPA 95% Probablity/95% Confidence Qw = 4.5 MGD
MAXIMUM DATA POINTS = 58
Qw(MGD)= 4.50 WWTP/WTP Class: IV
1Q1OS(cfs)= Modeled,Chronic Dilution Factor defined IWC% @ 1Q1OS = 11.94699313
7Q10S(cfs)= Modeled,Chronic Dilution Factor defined IWC% @ 7Q10S= 10
7Q1OW(cfs)= Modeled,Chronic Dilution Factor defined IWC%@ 7Q1OW= 10
30Q2(cfs)= Modeled,Chronic Dilution Factor defined IWC%®30Q2= 10
Avg.Stream Flow,QA(cfs)= Modeled,Chronic Dilution Factor defined IWC%@ QA= 10
Receiving Stream: Pasquotank River Stream Class: SC
PARAMETER NC STANDARDS OR EPA CRITERIA N REASONABLE POTENTIAL RESULTS
TYPE JO - RECOMMENDED ACTION
(1) ('hronic Applied Acute a m t1 Det. Max Pred Cw Allowable Cw
Standard
Acute(SW): 577.6
Arsenic C 36 SW(7Q10s) 69 ug,'L __ _ _ _ _-_ _ -_____---------------------
5 0 5.8 Chronic(SW): 360.0
C.V.(default) Max MDL=_5___ _ ____-_-___-________________
Arsenic C 10 HH(Qavg) ug'L Note:n<_9 NO DETECTS Chronic(HH): 100.0 No detects;All values<5 ug L
Limited data Max MDL=5
Acute: 336.49
Cadmium NC 8.9 SW(7Q10s) 40.2 ug/L 5 0 1 _ _ ___ ___ _ ___ _ _ ___ ___ ___ _
Note:n<_9 C.V.(default) Chronic: 89.00 No RPA,Predicted Max<50%of Allowable Cw
Limited data set NO DETECTS Max MDL=1 -No Monitoring required
Acute: NO WQS
Total Phenolic Compounds NC 300 A(30Q2) 10.0 up:I. 5 0 11.6 _ _ _ _ _ _ _
ole:n< C.V.(default) Chronic: 3,000.0 No RPA,Predicted Max<50%of A llo wable Cw
Limited(i NO DETECTS Max MDL=10 -No Monitoring required
Acute: 9,272.6
Chromium VI NC 50.4 SW(7Q10s) 1107.8 ug/L 0 0 N/A __ _ _ _____ _ ___________________________
Chronic: 504.0
a. No Monitoring required if all Total
Chromium,Total NC ug/L 5 05.8 Maximum reported value=2.5
Chromium samples are<the Chromium VI
Note:n<9 C.V.(default) Allowable Cw
Limited data' NO DETECTS Max MDL-5
Acute: 48.55
Copper NC 3.7 SW(7Q10s) 5.8 ug 1. 28 1 21.42 __ _______ _ _ _ _ _ _ _ __ _ _ ___ ___
Chronic: 37.00 No RPA,Predicted Max >50%of Allowable
No value>Allowable Cw Cw-apply Quarterly Monitoring
Acute: 8.4
Cyanide NC 1 SW(7Q10s) 1 10.0 ug I. 28 I 18.4
Chronic: 10.0 RPA-apply Monthly Monitoring with Limit
I value(s)>Allowable Cw
Acute: 1,848.16 No detects;All values<5 ug/L
Lead NC 8.5 SW(7Q10s) 220.8 ug/L 5 0 5.8 _ _ ______ _ _ _ ___ _ _ _ _ ___ ___ ___ _
Note:n<^ C.V.(default) Chronic: 85.00 No RPA,Predicted Max<50%of Allowable Cw
Limited data set NO DETECTS Max MDL=5 -No Monitoring required
Acute: 625.26
Nickel NC 8.3 SW(7Q10s) 74.7 ug/L 5 0 11.6 -_______________-_-________
Note:n<9 C.V.(default) Chronic: 83.00 No RPA,Predicted Max<50%of Allowable Cw
-
Limited data set NO DETECTS Max MDL=10 No Monitoring required
RPA EC with modeled dilution,rpa
Page 1 of 2 9/23/2019
Elizabeth City VWVTP Outfall 001
NC0025011 Saltwater RPA 95% Probablity/95% Confidence Qw = 4.5 MGD
Acute: NO WQS
Selenium NC 71 SW(7Q10s) ug/L 5 0 11.60 _ _ _ _ ___ _ _ _ _ _ _ _ _
Note:n<9 C.V.(default) Chronic 710.0 No RPA,Predicted Max<50%of Allowable Cw
Limited data set NO DETECTS Max MDL=10 -No Monitoring required
Acute: 18.41
Silver NC O.! SW(7Q10s) 2.2 ug/L 5 0 5.8 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Note:n<9 C.V.(default) Chronic: 1.00 No detects;All values<5 ug/L;No monitoring
added;Permittee shall report to lowest PQL(<1
Limited data set NO DETECTS Max MDL=5 ug/L)
Acute: 796.0
Zinc NC 85.6 SW(7Q10s) 95.1 ug/L 28 27 84.96 _ R_ _ _ _ _ _ _ _
Chronic 856.0 No PA,Predicted Max<50%of Allowable Cw
No value>Allowable Cw -No Monitoring required
Acute: NO WQS
Bromodichloromethane C 27 SW(7Q10s) µg/L 5 5 43.848 ___ ___ _ _ _ _ _ _ _ _ _
Note:n<9 C.V.(default) Chronic 270 No RPA,Predicted Max<50%of Allowable Cw
Limited data set No value>Allowable Cw -No Monitorin. required
RPA EC with modeled dilution,rpa
Page 2 of 2 9/23/2019
Permit NC0025011
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,
Elizabeth City
is hereby authorized to discharge wastewater from a facility located at
Elizabeth City WWTP
450 Knobbs Creek Drive
X .
Elizabeth City
Pasquotank County
to receiving waters designated as the Pasquotank River in the Pasquotank River Basin in
accordance with the discharge limitations,monitoring requirements, and other conditions set forth
in Parts I, II, III, and IV hereof.
This permit shall become effective Month xx, 2019.
This permit and the authorization to discharge shall expire at midnight on December 31,2023.
Signed this day Month xx, 2019.
DRAFT
Linda Culpepper,Director
Division of Water Resources
By Authority of the Environmental Management Commission
Permit NC0025011
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.
Elizabeth City
is hereby authorized to:
1. Continue to operate an existing 4.5 MGD wastewater treatment facility that includes the
following components:
> Mechanical bar screen
➢ Manually-cleaned bypass bar screen
D. Aerated grit removal
> Grit Dewatering Screw
> Parshall flume
> Aeration basin with nutrient removal
> Pump station with sludge return
➢ Clarifier splitter box
> Two (2) clarifiers
➢ Chlorine contact tank
> Sulfur dioxide injection with mixer for effluent dechlorination
> Effluent weir box with ultrasonic flow meter
> Re-aeration tank with floating aerator
> One 30-inch discharge pipe plumbed to two each 24-inch outfall lines with diffusers
> Gravity Belt Thickener
> Sludge storage tanks
This facility is located at the Elizabeth City WWTP (450 Knobbs Creek Drive,
Elizabeth City)in Pasquotank County.
2. Discharge from said facility, at a specified location(see attached map), into the Pasquotank
River, a Class SC waterbody within the Pasquotank River Basin.
Page 2 of 11
Permit NC0025011
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (4.5
MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water
Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until permit expiration, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored' by
the Permittee as specified below:
PARAMETER EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code
Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location2
Flow(MGD) 50050 4.5 MGD Continuous Recording I or E
CBOD, 5-day, 20°C
Summer3 (April 1 through 80082 12.0 mg/L 18.0 mg/L Daily Composite I, E
October 31)
CBOD, 5-day, 20°C Winter3
(Nov. 1 through March 31) 80082 25.0 mg/L 37.5 mg/L Daily Composite I, E
Total
(TSS)Suspended Solids C0530 30.0 mg/L 45.0 mg/L Daily Composite I, E
Ammonia (NH3 as N)
(April 1 October 31) C0610 4.0 mg/L 12.0 mg/L Daily Composite E
Ammonia (NH3 as N)
(November 1 March 31) C0610 8.0 mg/L 24.0 mg/L Daily Composite E
Enterococci 35/ 100 276/ 100
(geometric mean) 61211 mL mL Daily Grab E
Dissolved Oxygen 00300 Daily average > 5.0 mg/L Daily Grab E
Total Residual Chlorine 50060 13 pg/L DailyGrab E
(TRC)4
Temperature(°C) 00010 Daily Grab E
Conductivity 00094 Daily Grab E
pH 00400 Between 6.8 and 8.5 standard units Daily Grab E
Total Nitrogen, mg/L C0600 1/Month Composite E
(NO2+NO3+TKN)
Total Phosphorous, mg/L C0665 1/Month Composite E
Total Copper 01042 1/Quarter Composite E
Chronic Toxicity6 TGP3E 1/Quarter Composite E
Total Cyanide5'7 00720 10.0 pg/L5 1/Month Composite E
Effluent Pollutant Scan NC01 Monitor and Report Footnote 8 E
Footnotes(on next page):
Page 3 of 11
Permit NC0025011
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system
[see A.(6.)].
2. I=Influent.E=Effluent.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value(i.e.,85%removal is required).
4. Total residual chlorine shall be monitored only if chlorine is added to the treatment process. The Division shall
consider all effluent total residual chlorine values reported below 50 ug/1 to be in compliance with the permit.
However, the permittee shall continue to record and submit all values reported by a North Carolina certified
laboratory(including field certified),even if these values fall below 50 ug/1.
5. The Permittee shall achieve compliance with these limitations within three years of the effective date of this permit
and shall follow the Total Cyanide compliance schedule detailed in Special Condition A.(5.).Starting on the effective
date of this permit,the Permittee shall perform monthly effluent Monitoring and Reporting for Total Cyanide.Metals
monitoring shall coincide with chronic toxicity monitoring.
6. Chronic Toxicity(Mysidopsis bahia)P/F limited at 10%,March,June,September and December[see A.(3.)].
7. Cyanide — The Division shall consider all cyanide values reported below 10 pg/L to be "zero" for compliance
purposes. However, Discharge Monitoring Reports (DMRs) shall record all values reported by a North Carolina-
certified laboratory(even if these values fall below 10 pg/L).
8. The permittee shall perform three Effluent Pollutant Scans during the term of this permit[see A.(4.)].
The Permittee shall discharge no floating solids or foam visible in other than trace amounts.
A. (2.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B .0500 et seq.]
Samples shall be collected monthly at two sampling points:
➢ Upstream of the outfall at Norfolk 7 Southern Railroad bridge
➢ Downstream of the outfall at the U.S. Highway 158 bridge
Instream samples shall be collected as grab samples from approximately 6"below the river surface and test
for the following parameters:
PARAMETER CHARACTERISTICS
Parameter Code UNITS
Temperature 00010 Degrees Celsius
Dissolved Oxygen 00300 mg/L
Salinity 00480 ppt
Total Nitrogen C0600 mg/L
Total Phosphorous C0665 mg/L
Chlorophyll-a 32230 µg/L
Enterococci 61211 #/100 m L
pH 00400 s.u.
Page 4 of 11
Permit NC0025011
A. (3.) CHRONIC TOXICITY P/F PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Mysidopsis bahia at an effluent concentration of 10%.
The permit holder shall perform at a minimum,quarterly monitoring using procedures described below to
establish compliance with the permit condition.The tests will be performed during the months of March,
June,September and 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.
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 EPA Method 1007.0,Mysid,Mysidopsis bahia,Survival,Growth,
and Fecundity Test,as described in Short-Term Methods for Estimating the Chronic Toxicity of
Effluents and Receiving Waters to Marine and Estuarine Organisms, Third Edition,EPA821-R-02-014,
October 2002.
The test procedure will be based on EPA Method 1007.0, Mysid,Mysidopsis bahia, Survival,Growth,and
Fecundity Test,as described in Short-Term Methods for Estimating the Chronic Toxicity of Effluents and
Receiving Waters to Marine and Estuarine Organisms, Third Edition,EPA-821-R-02-014,The procedure
will be performed as written with the following exceptions:
• The test treatments will consist of a control and a 10% effluent concentration("pass/fail,")
or a control and five effluent concentrations ranging from 2.5%to 30%.
• Mortality for pass/fail tests will be evaluated using the t test described in Section 11.3 in
Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine
Organisms, Fifth Edition. EPA-82 I-R-02-012,October 2002, applying an alpha level of
0.05.
• The growth endpoint for pass/fail tests will be determined using Appendix G of Short-Term
Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine
and Estuarine Organisms, Third Edition,EPA-821-R-02-014,October 2002,applying an
alpha level of 0.01.
• Mortality and growth endpoints for multiple-concentration tests will be determined using
hypothesis testing as described in EPA Method 1007.0,Mysid,Mysidopsis bahia, Survival,
Growth,and Fecundity Test,as described in Short-Term Methods for Estimating the Chronic
Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Third
Edition, EPA-821-R-02-014,October 2002.
• Fecundity will not be evaluated.
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. For pass/fail results,report using the
parameter code TGP3E and the DWR Form AT-4(original),which is to be sent to the address below.
Additionally,for reporting Chronic Value results use the parameter code THP3E and DWR Form AT-6
(original),which 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,North Carolina 27699-1621
Page 5 of 11
Permit NC0025011
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 11
Permit NC0025011
A. (4.) PRIORITY POLLUTANT ANALYSIS
[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 organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene
Acrolein Phenol Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol Indeno(1,2,3-cd)pyrene
Benzene Base-neutral compounds: Isophorone
Bromoform Acenaphthene Naphthalene
Carbon tetrachloride Acenaphthylene Nitrobenzene
Chlorobenzene Anthracene N-nitrosodi-n-propylamine
Chlorodibromomethane Benzidine N-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 St 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.
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Permit NC0025011
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 subject to
additional toxicity 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 Toxicology Branch at 919-743-8401 for guidance 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.) SCHEDULE OF COMPLIANCE FOR TOTAL CYANIDE LIMITATIONS
[G.S. 143-215.1 (b)]
1. Within 1 year of the effective date of the permit, the Permittee shall submit to the Division of Water
Resources an Action Plan, for Division approval, summarizing the strategy or actions to be taken to
achieve compliance with the Total Cyanide limitation listed in Section A. (1.). The plan will include
specific dates for completion or implementation of each action.
2. Within 2 years of the effective date of the permit, the Permittee shall submit a report to the Division
summarizing actions taken in accordance with the Action Plan. The Permittee shall achieve
compliance with the Total Cyanide limitation specified in Section A. (1.).
3. The Permittee shall achieve compliance with Total Cyanide limitation specified in Section A. (1.)
within 3 years of the effective date of the permit.
Any modifications to the schedule shall be requested to the Division at least ninety (90) days before the
deadline. Modifications to the schedule in excess of four(4)months will be subject to public notice.
The Action Plan and Reports shall include the owner's name, NPDES permit number and Permittee contact
person,and shall be submitted to:
(1) NCDEQ/Division of Water Resources (2) NCDEQ/Division of Water Resources
NPDES Complex Permitting Washington Regional Office
1617 Mail Service Center 943 Washington Square Mall
Raleigh,NC 27699-1617 Washington,NC 27899
Page 8 of 11
Permit NC0025011
A. (6.)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)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. 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).
Page 9 of 11
Permit NC0025011
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/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:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.(11.)(d)j
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:
Page 10of11
Permit NC0025011
"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 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 fora 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 11 of 11
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