NC0081621_Draft Permit_20180821

. ROY COOPER
Gover as
MICHAEL S.REGAN
secretary
Water Resources LINDA CULPEPPER
Interim Da ector
ENVIRONMENTAL QUALITY
August 21, 2018
Mr. Timothy R. Kiser, P.E.
Engineering Director
Water and Sewer Authority of Cabarrus County
P. O. Box 428
Concord,NC 28026
Subject: Draft NPDES Permit
Permit NC0081621
Muddy Creek WWTP
Cabarrus County
Grade II(0.15 &0.3 MGD) & III (0.53
° MGD)Biological WPCS
SIC Code 4952
Dear Mr. Kiser:
Enclosed with this letter is a copy of the Draft NPDES permit renewal and modification 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:
• The Division reviewed and concurred with your flow justification of 0.53 MGD, as well
as the EAA conclusion that the direct discharge to surface water alternative is the most
environmentally sound alternative selected from all reasonably cost-effective options (per
15A NCAC 2H.0105(c)(2)).
• The'Supplement to Permit Cover Sheet has been updated to include prior to expansion to
0.53 MGD with outfall 002,plans and specifications must be submitted to the Division for
approval and subsequent issuance of Authorization to Construct(A to C).No construction
may begin until such authorization has been issued by the Division. Also,no discharge via
outfall 002 may begin until submission of Engineer's Certification of completion to the
Division.
• Special condition has been added to the permit (See A. (5.)) requiring closure of the
existing facility (outfall 001) once the construction of the new facility (outfall 002) has
been completed and the Engineer's Certification of completion has been submitted to the
Division.
• The Effluent Limitations and Monitoring Requirements (A. (3.)) for the new facility with
outfall 002 has been added to the permit.
• The topographic map was updated to include the proposed location of outfall 002 and the
location of the existing facility.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919 807 6300

Page 13
• Regulatory citations have been added to the permit.
Please note that the receiving stream, Rocky River, is listed as impaired for turbidity, copper and
zinc on the North Carolina 2016 303(d) Impaired Waters List. Addressing impaired waters is a
high priority with the Division, and instream data will continue to be evaluated. If there is
noncompliance with permitted effluent limits and stream impairment can be attributed to your
facility, then mitigative measures may be required.
The NPDES Standard Conditions (Parts II, III, and IV) are not included with this draft. They can
be found at the following link if you would like to review them in conjunction with this draft
permit.
http://portal.ncdenr.org/c/document_library/get file?uuid=b32f8a66-541c-4cf5-8ba6-
03 e3 81 edb2da&groupld=3 83 64
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Cabarrus 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 contact me at(919) 707-3607 or by email at [e-mail].
Sincerely, t\
Qais Banihani, Engineer
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
Ecopy: Mooresville Reginal Office/Water Quality
US EPA Region 4
Wastewater Operator Certification Group/Maureen Kinney
WSS/Aquatic Toxicology Branch/Susan Meadows
WSS/Ecosystem Branch/Mark Vander Borgh
NCWRC/Olivia Munzer
Willis Engineers/Charles A. Willis
Field WWTP Operator/Kimberly D. Holt

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER T.HE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
'NY \-•\
In compliance with the provision of North Carolina General/Statute 143-21'5.1,'other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,'the
\ , „ \/
Water and Sewer Authority of Caliarrus County
`J
is hereby authorized to dischar-ge,wastewater from a'facility located at the
->
Muddy Creek WWTP
---14655 Hopewell Church koad
/ ,
Midland
)
``
,r Cabarrus County
to receivingwaters designated ascthe RockyRiver iii subbasin 03-07-12 of the Yadkin-Pee Dee River
Basin in accordance-witleffluent limitations, monitoring requirements, and other conditions set forth in
Parts I,-II,IlI and IV hereof:
° a
This permit'shall become effective Mon'tb ,20XX.
This permit and authorization to discharge shall expire at midnight on October 31,2023,
Signed this day M¢'n ' _ ,.293X.
N.
DRAFT
Linda Culpepper, Interim Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0081621
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.15 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade II Biological Water Pollution
Control System 115A NCAC 08G.0302]
During the period beginning upon the effective date of this permit and lasting until expansion above
0.15 MGD (and receipt of the Engineer's Certification of completion) or until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored)
by the Permittee as specified below: /
7
PARAMETER CHARACTERISTICS EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly . Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency 2 Type Location 2
Flow 50050 0.15 MGD / Continuous Recoding Influent or Effluent
.""
BOD,5-day(20°C)3 C0310 10.0 mg/L 15.0 mg/L y ;`, /2/Week Composite,,› Influent and
(April 1—October 31) �.<,,, /1' P,7 > Effluent
BOD,5-day(20°C)
3 �°�,,q �"�,t,���; ,, Influent and
C0310 20.0 mg/L ,.30.0 mg/L 2/Week Composite
(November 1 —March 31) f ~ ¢ - Effluent
Total Suspended Solids ~ Influent and
C0530 30.0 mg/L `'45:0 mg/L 4 A- ..k 2 /Week Composite Effluent
(TSS)3 ', ,'). '-, --- ``�
Ammonia(NH3 as N) `` "
(April 1 -October 31) C0610 „r4,0 mg/L 12.0,mg/,L / ��-: ,>2/W, eek Composite Effluent
Ammonia(NH3 as N)mg/L x;, ,;, --"" , ,,\ A `/ n�
(November 1 -March 31) C06J0 8.0 mg/L '' 24.0 mgl V ,,( 21Week Composite Effluent
Dissolved Oxygen(DO) ,t.00300 Daily average?.5.0 mg/L' = 3/Week Grab Effluent
Fecal Coliform 31616k 22 1100 L� ~400!100"mL 'f 2/Week Grab Effluent
(geometric mean)'"
F� ". n ,z+, , .,/
Total Residual,Chlorine - s.
'•50060 28 pg/L 3/Week Grab Effluent
(TRC)4 ,:,/ v-,., :.
Temper`ature'(°.C) 00010," '',. �v- / 3/Week Grab Effluent
_pH ' 00400 )
Between 6.0 and 9.0 standard units 3/Week Grab Effluent
Total Hardness[as CaCO3]
• 00900
� / Monitor and Report Quarterly Composite Effluent
(mg/L)6 `� ~ / °
Chronic Toxicity 6 '\~TGP3 Quarterly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 7 Footnote 7 Effluent
Page 3 of 15

Permit NC0081621
A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.3 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade II Biological Water Pollution
Control System [15A NCAC 08G.0302]
Beginning upon receipt of the Engineer's Certification of completion of the 0.3 MGD expansion and
lasting until expansion above 0.3 MGD (and receipt of the Engineer's Certification of completion) or
until expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be
limited and monitored1 by the Permittee as specified below: ,
PARAMETER CHARACTERISTICS EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency 2 Type Location 2
Flow 50050 0.3 MGD // Continuous Recording Influent or Effluent
e
BOD,5-day(20°C)3 7 2/Week 4 Com osite;° -' . Influent and
C0310 10.0 mg/L 15.0 mg/L` p
(April 1—October 31) �' - i •K/ Effluent
BOD,5-day(20°C)3 �yz a:`,n, 4`�" Influent and
C0310 20.0 mg/L 30.0 mg/L 2/Week Composite Effluent
(November 1 —March 31) V1 -
Total Suspended Solids ��'�''' ` �> Influent and
C0530 30.0 mg/L \45:O mg/L'-' ._y 2/Week 4 Composite Effluent
(TSS)3 --1/4 � o
Ammonia(NH3 as N) °:, , -'-'. ,:::: '� X' v,v
(April 1 -October 31) C0610 4.0 mg/L 12.0 mg/L ,, ' y-,.b 2IWeek-4' Composite Effluent
/- , / ' „ Mme.
Ammonia(NH3 as N)mg/L ,/' ,---""----,°_ '" 4' , '� �' ``/
00610- 8. 0 mg/s1.. �y, 24.0 mg/L�" 's 21Week 4 Composite Effluent
(November 1 -March 31) / :,X
Dissolved Oxygen(DO) '-•,; 00300 Daily/average>_5.0 mg/L 3/Week Grab Effluent
Fecal Coliform 31616 '`20%100 mL '400/1001mL - 2/Week 4 Grab Effluent
(geometric meaq) 7,
Total Residual,Chlorine `-- , :
, w 50060 �. 28 pg/L 3/Week Grab Effluent
(TRC)'5 s,
Temperature(,,�C) 0000\ 3/Week Grab Effluent
pH �' 00400 Between 6.0 and 9.0 standard units 3/Week Grab Effluent
Total Hardness[as'4CO3)
(mg/L)s 00900 Monitor and Report Quarterly Composite Effluent
Chronic Toxicity 7 �TGP3B Quarterly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 8 Footnote 8 Effluent
Dissolved Oxygen 9(mg/L) 00300 Variable Grab U,D
Page 5 of 15

Permit NC0081621
A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.53 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution
Control System [15A NCAC 08G.0302]
Beginning upon receipt of the Engineer's Certification of completion of the 0.53 MGD expansion and
lasting until permit expiration, the Permittee is authorized to discharge from outfall 002. Such
discharges shall be limited and monitored) by the Permittee as specified below:
A..
> .
PARAMETER CHARACTERISTICS EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency 2 Type Location 2
Flow 50050 0.53 MGD i y Continuous 'Recording Influent or Effluent
BOD,5-day(20°C)3 i �'' ' Influent and
(April 1 -October 31) C0310 5.0 mg/L 7.5 mg/L ,� 31Week Composite '' . Effluent
BOD,5-day(20°C)3 \ :'.\ / / Influent and
(November 1 -March 31) C0310 10.0 mg/L 15.0 mg/L .`°',,' - /3/Week Composite Effluent
/":-4. \, /
Total Suspended Solids " v ''y Influent and
(TSS)3 C0530 30.0 mg/L .4550-mg%L'".,w`� ,' '3/Week Composite, Effluent
Ammonia(NH3 as N) >~'� ``� -\
(April 1 -October 31) C0610 1.0 mg/L 3..0�.`mg/L ry" ;' -, 31Week> Composite Effluent
"V ,,,rte v
Ammonia(NH3 as N)mg/L ' o.,�C0610 2.0 mg/L 6.0 mg/L,;
q / 3/Week Composite Effluent
(November 1 -March 31) v z
-a
Dissolved Oxygen(DO) . `00300 Daily<<average z 5.0 mg/L 3/Week Grab Effluent
Fecal Coliform `-"
��31616�N200/100 niL '-400/100 mL. -'/7 3/Week Grab Effluent
(geometric mean)•�� .,y -=- /
Total Residual Chlorine ```� .:

Permit NC0081621
A(4.) 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 0.60% at 0.15 MGD flow regime,
1.2% at 0.3 MGD flow regime and 2.1% at 0.53 MGD flow regime.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,'"YRevised December 2010, or
subsequent versions or "North Carolina Phase II Chronic Whole Ef ierit'Toxicity Test Procedure"
(Revised- December 2010) or subsequent versions. The tests will be performed during the months of
January, April, July and October. These months signify the first month\of each three-month toxicity
testing quarter assigned to the facility. Effluent sampling for/,*(to ting\must be obtained during
representative effluent discharge and shall be performed at the ANDES 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 sha11 b"e 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
of�
All toxicity testing results required as p ' this°pernut condition-swill artbe entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in-whick•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 ./
Attentieri*j'Ak Carolina Division of Water Resources
Water'Sciences Section/Aquatic Toxicology Branch
\ 1621 Mail`.Service Center
r' - 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\ accurat,include all supporting chemical/physical measurements and all
concentration/response data, andlbe 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.
Page 9 of 15

Permit NC0081621
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: Die hyl'phthalate
Mercury(EPA Method P-chloro-m-cresol Dimethyl phthalate
1631 E) y
Nickel 2-chlorophenol � ,4`=dinitrotoluene
Selenium 2,4-dichlorophenol/ , 2,6-din trotoluene
Silver 2,4-dimethylphenol `' 1,2-diphenylhydrazine
Thallium 4,6-dinitro-o cresol Fluoranthene\; °.‘,
Zinc 2,4-dinitrophenol 4Fluorene ' , .\,,
Cyanide 2-nitrophenol, , , f/ Hexachlorobenzerie/
`
Total Phenolic Compounds 4-nitrophenol \ ,,„ /-- Hexachlorobutadiene
Volatile organic compounds: PPhentachlorophenol,,� ° %' Hexachlorocyclo-pentadiene
Acrolein enol,:`:-.., \, \ Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol t ` °indeno(1,2,3-cd)pyrene
�
Benzene Base-neutral compounds: ``\Is p orone
Bromoform --w, Acenaphthene��' %,,,---, �- �-- Naphthalene
Carbon tetrachloride ,,., _ �`‘, Acenaphthylene" ''=. ,%Nitrobenzene
Chlorobenzene /�/ '`, ',Anthracene// N-nitrosodi-n-propylamine
Chlorodibromomethaane j''' ;Benzidine•°,` N-nitrosodimethylamine
Chloroethane `'°.,'' • /-_°Benzo(a)anthracene N-nitrosodiphenylamine
2-chloroethylvinyl'ether 7` a.Benzo(a)pyrene> Phenanthrene
Chloroform-7--.. , . // 3,4 benzo fluoranthene Pyrene
Dichlorobromomethane'"�, - ' Benzo(ghi)perylene 1,2,4-trichlorobenzene
x'1,1-dichloroethane, ' Benzo(k)fluoranthene
�.1,2-dichloroethane `• ''... ,Bis (2-chloroethoxy)
`i , .,.methane
Reporting. Test results shallibe{reported on DWR Form-A MR-PPA1 (or in a form approved by the
Director) by December 31s;.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.,
\. 2
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
Page 11 of 15

Permit NC0081621
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).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the per nittee-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 alsolink 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
Page 13 of 15

Permit NC0081621
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;��.... ,\\; �, �.- _._pi .ak .....,;.,.\t'ti fa'+ , _� (i — .,,
71
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�� ,.� , ;' ..,,,....\-, - Location • �, off;
1 'i��� :0� ,` •\ `( r_ ( ' Outfall 002 / o
t I fc-,�
-;) ,I.// //- (( I- _1(7-----___ s'.5.),,..'.) i ) -j_75-),) ii.. ----?, (Z
NC0081621 — Muddy Creek WWTP Facility --
Latitude: 35°12'311" Sub-Basin: 03-07-12 Location 1 4
Longitude: 80029'27" River Basin: Yadkin-Pee Dee
Quad Name: Stanfield,N.C. Receiving Stream: Riatv5 o` 1
Stream Class: C HUC: 03040105 r__•il Cabarrus County
�f�l(�1 �, Map not to scale