NC0046728_Permit (Issuance)_20191007

ROY COOPER 4.
Governor y l
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
October 7, 2019
Mr. Miles Atkins, Mayor
Town of Mooresville
PO Box 878
Mooresville, North Carolina 28115
Subject: Final NPDES Permit Renewal
Permit NC0046728
Rocky River WWTP
Iredell County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Atkins:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly,we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007
(or as subsequently amended).
Please note that the receiving stream is listed as impaired for benthos on the North Carolina 2018
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 Division received your comments in a letter dated September 10,2019,no changes in the
permit resulted from those comments. Included with the permit is the Fact Sheet with an
Addendum listing your comments and our responses to those comments. Please see page 10
in the Fact Sheet to review our responses.
The final permit maintains the following significant changes identified in the letter sent on
August 19, 2019:
• DWR's record shows the Engineer Certification was received on 04/02/2012. The Rocky
River WWTP has entered the 7.5 MGD flow tier. As such, Effluent Limitations and
Monitoring Requirements for the 5.5 MGD flow tier have been removed from the permit.
• The component list of the Rocky River WWTP has been updated.
fE Q- ' North Carolina Department of Environmental Quality I Division of Water Resources
NORTH CAROIJ in �� 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
�era•EmIrommelli it e" 919.7079000

• Based on the Mercury TMDL evaluation, no Mercury Minimization Plan (MMP) is
required during this permit cycle. Therefore, the MMP Special Condition was removed
from the permit.
• Based on the reasonable potential analysis(RPA) showing no reasonable potential to
violate state water quality standards, the monitoring requirements for Lead and Zinc have
been removed from the permit [See A. (1)].
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to
violate state water quality standards, Cyanide limits and monitoring requirement have
been removed from the permit [See A. (1)].
• Based on the reasonable potential analysis(RPA) showing reasonable potential to violate
state water quality standards, total copper limits have been added to the permit and the
quarterly monitoring requirement has been changed to monthly monitoring [See A. (1)].
• The facility reported Arsenic, Cadmium, Copper, Lead,Nickle, Selenium, Silver and
Zinc at less than detection, with detection levels< 10 µg/L, < 1 µg/L, <5 µg/L, < 5 µg/L,
< 10 µg/L, < 10 µg/L, < 5 µg/L, and< 30 µg/L, respectively. DWR's laboratory
identifies the target Practical Quantification Limits (PQLs) for Arsenic as 2 µg/L,
Cadmium as 0.5 µg/L, Copper as 2 µg/L, Lead as 2 µg/L,Nickel as 2 µg/L, Selenium as
1 µg/L, Silver as 1 µg/L, and Zinc as 10 µg/L. 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 determined
capable of achieving detection and reporting levels below permit discharge requirements,
then the approved method with the lowest detection and reporting level must be used.
The facility should use sufficiently sensitive test methods for all pollutants, including
when performing Effluent Pollutant Scans. Failure to analyze to the approved detection
level or lower reporting level may result in limits for abovementioned metals during the
next renewal, specifically Silver.
• Some of the wording has changed in Special Condition A. (2), Chronic Toxicity Permit
Limit. Please review each paragraph carefully.
• Special Condition A. (3)has been modified to include the specific three years in which
the Effluent Pollutant Scan shall be performed (2020, 2021, 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.
• 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. (4)].
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
[See A. (1)]
• Regulatory citations have been added to the permit.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
Page 2 of 3

petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental regulations.
If you have any questions concerning this permit, please contact Min Xiao at [phone] or
via email at [e-mail].
Sincerely,
it&x.9.?Ai/rt.,
nda Culpepper, Director
if,o
ivision of Water Resources,NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
Town of Mooresville/Jeff Campbell ([e-mail])
Town of Mooresville/Jamie Levis ([e-mail])
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Hannah Headrick
DWR/PERCS
Page 3 of 3

Permit NC0046728
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,
Town of Mooresville
is hereby authorized to discharge wastewater from a facility located at the
Rocky River WWTP
369 Johnson Dairy Road
Mooresville
Iredell County
to receiving waters designated as Dye Creek in the Yadkin-Pee Dee 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 November 1,2019.
This permit and authorization to discharge shall expire at midnight on March 31,2024.
Signed this day October 7,2019.
dda Culpep ,D. ec r
sion of Water Resources
By Authority of the Environmental Management Commission

Permit NC0046728
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.
The Town of Mooresville is hereby authorized to:
1. Continue to operate a 7.5 MGD wastewater treatment facility consisting of the following components:
• Influent screw pump station
• Two equalization tanks
• Dual mechanical screens
• Two dual aeration basins(mechanical fixed aerators)
• Two dual final clarifiers
• Mixing tower
• Micro screen rotary disc filtration
• Dual UV channels using TrojanUV3000plusTM system
• A series of cascades
• RAS/WAS pumps
• Two aerobic digesters(diffused air)
• A filter belt press
• Covered sludge storage area
• Four standby generators
This facility is located at Rocky River Wastewater Treatment Plant, 369 Johnson Dairy Road, in the Town
of Mooresville in Iredell County.Rocky River WWTP is currently rated a Grade IV facility.
2. Discharge from said treatment works at the location specified on the attached map into Dye Creek,which is
classified C water in the Yadkin-Pee Dee River Basin.
Page 2of10

Permit NC0046728
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (7.5 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 this permit and lasting until expiration,the Permittee is
authorized to discharge up to 7.5 MGD 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 Measuremen Sample Sample
Average Average Maximum t Frequency Type Location 2
Flow 50050 7.5 MGD Continuous Recording I or E
BOD5(20°C)C) [Summer] 80082 5.0 mg/L 7.5 mg/L Daily Composite I and E
BOD5(20°C)3 [Winter] 80082 10.0 mg/L 15.0 mg/L Daily Composite I and E
Total Suspended Solids 3 C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E
NH3 as N[Summer] C0610 1.0 mg/L 3.0 mg/L Daily Composite E
NH3 as N[Winter] C0610 2.0 mg/L 6.0 mg/L Daily Composite E
Dissolved Oxygen 00300 Daily Average not less than 6.0 mg/L Daily Grab E
Dissolved Oxygen(mg/L) 00300 3/Week Grab U and D
pH 00400 Between 6.0 and 9.0 standard units Daily Grab E
Fecal Coliform
31616 200/100m1 400/100m1 Daily Grab E
(geometric mean)
Total Residual Chlorine 4 50060 17 µg/L Daily Grab E
Temperature(°C) 00010 Daily Grab E
Temperature(°C) 00010 3/Week Grab U and D
Total Nitrogen 5(mg/L) C0600 Monthly Composite E
Total Phosphorus(mg/L) C0665 Monthly Composite E
Total Copper 01042 19.5 ug/L 28.3 ug/L Monthly Composite E
Total
(mg/L)6 Hardness [as CaCO3] 00900 Quarterly Composite E
Total Hardness[as CaCO3] 00900 QuarterlyGrab U
(mg/L)7
Chronic Toxicitys
TGP3B Quarterly Composite E
Effluent Pollutant Scan NC01 Monitor and report Footnote 9 E
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see A. (4)].
2. Sample locations: I—Influent; E—Effluent; U—Upstream approximately'A mile upstream of the outfall; D—
Downstream at NCSR 2420 and NCSR 1394. Upstream and downstream samples shall be grab samples
collected 3/Week during the months of June,July,August,and September then once per week during the other
months of the year.As a participant in the Yadkin-Pee Dee River Basin Association,the instream monitoring
requirements for dissolved oxygen and temperature are waived. Should your membership in the association
be terminated,you shall notify the Division and begin instream sampling immediately.
Page 3 of 10

Permit NC0046728
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15%of the
respective influent value(85%removal).
4. The limit and monitoring requirements only apply when the effluent is chlorinated. The Division shall consider
all effluent TRC values reported below 50 µg/L to be in compliance with the permit.However,the permittee
shall continue to record and submit all values reported by a North Carolina certified laboratory(including field
certified),even if these values fall below 50 µg/L.
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. Effluent Total Hardness sampling shall be conducted in conjunction with effluent metals for the pretreatment
program.
7. The permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream. If the permittee is a member of a monitoring coalition
program, sampling for instream hardness may be waived as long as the monitoring coalition agrees to sample
hardness at the nearest upstream location,at a minimum frequency of quarterly,and the permittee has obtained
approval from DWR-NPDES Permitting Unit that the upstream station being monitored by the Coalition is
representative of the receiving stream for this discharge.The permittee is responsible for submitting instream
hardness test results with its permit renewal application package. If Coalition membership is cancelled or the
Coalition terminates instream hardness sampling at the approved station,the permittee will immediately notify
the Division and resume sampling for instream hardness upstream of its discharge.
8. Chronic Toxicity(Ceriodaphnia)limit at 90%with testing in February,May,August, and November[see A.
(2)].
9. The permittee shall perform three effluent pollutant scans during the term of this permit [See A..(3)].
[Summer] =April 1-October 31 [Winter]=November 1-March 31
Total Nitrogen=NO2+NO3+TKN Lbs/day=Pounds/Day
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 10

Permit NC0046728
A. (2) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]
of reproduction or significantmortality
The effluent discharge shall at no time exhibit observable inhibitionep oduction orta ty to
Ceriodaphnia dubia at an effluent concentration of 90%at 7.5 MGD.
Thepermit holder shallperform at a minimum,quarterlymonitoringusingtest 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 fmal 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 fmal 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.
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Permit NC0046728
A. (3) 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 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
Page 6 of 10

Permit NC0046728
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.
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 testsperformed at least annuallyin the four and one halfyearperiodprior to the application. These tests shall
PP
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. (4) 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)intemet 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
Page 7 of 10

Permit NC0046728
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).
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
Page 8 of 10

Permit NC0046728
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)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 certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These
records or copies shall be maintained for a period of at least 3 years from the date of the report. This period
may be extended by request of the Director at any time [40 CFR 122.41].
Page 9of10

Permit NC0046728
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Rocky River WWTP - NC0046728 I Facility
Location •
USGS Quad Name:Mooresville Lat.:35°31'33"
Receiving Stream:Dye Creek(Branch) Long.:80'46'56" ,•
Stream Class:C
Subbasin:Yadkin-Pee Dee-03-07-11 North Not to SCALE
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PART II
STANDARD CONDITIONS FOR NPDES PERMITS
Section A. Definitions
2/Month
Samples are collected twice per month with at least ten calendar days between sampling events.These samples shall be
representative of the wastewater discharged during the sample period.
3/Week
Samples are collected three times per week on three separate calendar days.These samples shall be representative of
the wastewater discharged during the sample period.
Act or"the Act"
The Federal Water Pollution Control Act,also known as the Clean Water Act(CWA),as amended, 33 USC 1251,et.
seq.
Annual Average
The arithmetic mean of all"daily discharges" of a pollutant measured during the calendar year. In the case of fecal
coliform,the geometric mean of such discharges.
Arithmetic Mean
The summation of the individual values divided by the number of individual values.
Bypass
The known diversion of waste streams from any portion of a treatment facility including the collection system,which is
not a designed or established or operating mode for the facility.
Calendar Dav
The period from midnight of one day until midnight of the next day. However,for purposes of this permit,any
consecutive 24-hour period that reasonably represents the calendar day may be used for sampling.
Calendar Week
The period from Sunday through the following Saturday.
Calendar Quarter
One of the following distinct periods: January through March, April through June,July through September,and
October through December.
Composite Sample
A sample collected over a 24-hour period by continuous sampling or combining grab samples of at least 100 mL in
such a manner as to result in a total sample representative of the wastewater discharge during the sample period.The
Director may designate the most appropriate method(specific number and size of aliquots necessary,the time interval
between grab samples,etc.)on a case-by-case basis. Samples may be collected manually or automatically.Composite
samples may be obtained by the following methods:
(1) Continuous:a single,continuous sample collected over a 24-hour period proportional to the rate of flow.
(2) Constant time/variable volume:a series of grab samples collected at equal time intervals over a 24 hour period
of discharge and combined proportional to the rate of flow measured at the time of individual sample
collection,or
(3) Variable time/constant volume:a series of grab samples of equal volume collected over a 24 hour period with
the time intervals between samples determined by a preset number of gallons passing the sampling point.Flow
measurement between sample intervals shall be determined by use of a flow recorder and totalizer,and the
preset gallon interval between sample collection fixed at no greater than 1/24 of the expected total daily flow at
the treatment system,or
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(4) Constant time/constant volume:a series of grab samples of equal volume collected over a 24-hour period at a
constant time interval. Use of this method requires prior approval by the Director.This method may only be
used in situations where effluent flow rates vary less than 15 percent.The following restrictions also apply:
➢ Influent and effluent grab samples shall be of equal size and of no less than 100 milliliters
➢ Influent samples shall not be collected more than once per hour.
➢ Permittees with wastewater treatment systems whose detention time<24 hours shall collect effluent grab
samples at intervals of no greater than 20 minutes apart during any 24-hour period.
➢ Permittees with wastewater treatment systems whose detention time exceeds 24 hours shall collect effluent
grab samples at least every six hours;there must be a minimum of four samples during a 24-hour sampling
period.
Continuous flow measurement
Flow monitoring that occurs without interruption throughout the operating hours of the facility.Flow shall be
monitored continually except for the infrequent times when there may be no flow or for infrequent maintenance
activities on the flow device.
Daily Discharge
The discharge of a pollutant measured during a calendar day or any 24-hour period that reasonably represents the
calendar day for purposes of sampling. For pollutants measured in units of mass,the "daily discharge" is calculated as
the total mass of the pollutant discharged over the day. For pollutants expressed in other units of measurement,the
"daily discharge"is calculated as the average measurement of the pollutant over the day. (40 CFR 122.2; see also
"Composite Sample,"above.)
Daily Maximum
The highest"daily discharge"during the calendar month.
Daily Sampling
Parameters requiring daily sampling shall be sampled 5 out of every 7 days per week unless otherwise specified in the
permit. Sampling shall be conducted on weekdays except where holidays or other disruptions of normal operations
prevent weekday sampling. If sampling is required for all seven days of the week for any permit parameter(s),that
requirement will be so noted on the Effluent Limitations and Monitoring Page(s).
DWR or"the Division"
The Division of Water Resources,Department of Environmental Quality.
Effluent
Wastewater discharged following all treatment processes from a water pollution control facility or other point source
whether treated or untreated.
EMC
The North Carolina Environmental Management Commission
EPA
The United States Environmental Protection Agency
Facility Closure
Cessation of all activities that require coverage under this NPDES permit. Completion of facility closure will allow this
permit to be rescinded.
Geometric Mean
The Nth root of the product of the individual values where N=the number of individual values.For purposes of
calculating the geometric mean,values of"0"(or"<[detection level]")shall be considered= 1.
Grab Sample
Individual samples of at least 100 nil,collected over a period of time not exceeding 15 minutes.Grab samples can be
collected manually.Grab samples must be representative of the discharge(or the receiving stream,for instream
samples).
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Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the CWA.
Instantaneous flow measurement
The flow measured during the minimum time required for the flow measuring device or method to produce a result in
that instance.To the extent practical,instantaneous flow measurements coincide with the collection of any grab
samples required for the same sampling period so that together the samples and flow are representative of the discharge
during that sampling period.
Monthly Average(concentration limit)
The arithmetic mean of all"daily discharges"of a pollutant measured during the calendar month. In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Permit Issuing Authority
The Director of the Division of Water Resources.
Quarterly Average(concentration limit)
The arithmetic mean of all samples taken over a calendar quarter.
Severe property damage
Substantial physical damage to property,damage to the treatment facilities which causes them to become inoperable,or
substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a
bypass. Severe property damage excludes economic loss caused by delays in production.
Toxic Pollutant:
Any pollutant listed as toxic under Section 307(a)(1)of the CWA.
Upset
An incident beyond the reasonable control of the Permittee causing unintentional and temporary noncompliance with
permit effluent limitations and/or monitoring requirements.An upset does not include noncompliance caused by
operational error,improperly designed treatment facilities, inadequate treatment facilities,lack of preventive
maintenance,or careless or improper operation.
Weekly Average(concentration limit)
The arithmetic mean of all"daily discharges" of a pollutant measured during the calendar week. In the case of fecal
coliform or other bacterial parameters or indicators,the geometric mean of such discharges.
Section B. General Conditions
I. Duty to Comply
The Permittee must comply with all conditions of this permit.Any permit noncompliance constitutes a violation of
the CWA and is grounds for enforcement action;for permit termination,revocation and reissuance,or
modification;or denial of a PP
permit renewal application [40 CFR 122.41].
a. The Permittee shall comply with effluent standards or prohibitions established under section 307(a)of the
CWA for toxic pollutants and with standards for sewage sludge use or disposal established under section
405(d)of the CWA within the time provided in the regulations that establish these standards or prohibitions or
standards for sewage sludge use or disposal,even if the permit has not yet been modified to incorporate the
requirement.
b. The CWA provides that any person who violates section[s] 301,302,306,307,308,318 or 405 of the Act,or
any permit condition or limitation implementing any such sections in a permit issued under section 402,or any
requirement imposed in a pretreatment program approved under sections 402(a)(3)or 402(b)(8)of the Act,is
subject to a civil penalty not to exceed$37,500 per day for each violation. [33 USC 1319(d)and 40 CFR
122.41(a)(2)]
c. The CWA provides that any person who negligently violates sections 301,302,306,307,308,318,or 405 of
the Act,or any condition or limitation implementing any of such sections in a permit issued under section 402
of the Act,or any requirement imposed in a pretreatment program approved under section 402(a)(3)or
402(b)(8)of the Act, is subject to criminal penalties of$2,500 to$25,000 per day of violation,or
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imprisonment of not more than 1 year,or both. In the case of a second or subsequent conviction for a negligent
violation,a person shall be subject to criminal penalties of not more than$50,000 per day of violation,or by
imprisonment of not more than 2 years,or both. [33 USC 1319(c)(1)and 40 CFR 122.41(a)(2)]
d. Any person who knowingly violates such sections,or such conditions or limitations is subject to criminal
penalties of$5,000 to$50,000 per day of violation,or imprisonment for not more than 3 years,or both. In the
case of a second or subsequent conviction for a knowing violation,a person shall be subject to criminal
penalties of not more than$100,000 per day of violation,or imprisonment of not more than 6 years,or both.
[33 USC 1319(c)(2)and 40 CFR 122.41(a)(2)]
e. Any person who knowingly violates section 301,302,303,306,307,308,318 or 405 of the Act,or any permit
condition or limitation implementing any of such sections in a permit issued under section 402 of the Act,and
who knows at that time that he thereby places another person in imminent danger of death or serious bodily
injury, shall,upon conviction,be subject to a fine of not more than$250,000 or imprisonment of not more than
15 years,or both.In the case of a second or subsequent conviction for a knowing endangerment violation,a
person shall be to a fine of not more than orimprisonment of not more than 30years,or
subject $500,000by P
both.An organization,as defined in section 309(c)(3)(B)(iii)of the CWA,shall,upon conviction of violating
the imminent danger provision,be subject to a fine of not more than$1,000,000 and can be fined up to
$2,000,000 for second or subsequent convictions. [40 CFR 122.41(a)(2)]
f. Under state law,a civil penalty of not more than$25,000 per violation may be assessed against any person
who violates or fails to act in accordance with the terms,conditions,or requirements of a permit. [North
Carolina General Statutes § 143-215.6A]
g. Any person may be assessed an administrative penalty by the Administrator for violating section 301,302,
306,307,308,318 or 405 of this Act,or any permit condition or limitation implementing any of such sections
in a permit issued under section 402 of this Act. Administrative penalties for Class I violations are not to
exceed$16,000 per violation,with the maximum amount of any Class I penalty assessed not to exceed
$37,500.Penalties for Class II violations are not to exceed$16,000 per day for each day during which the
violation continues,with the maximum amount of any Class II penalty not to exceed$177,500. [33 USC
1319(g)(2)and 40 CFR 122.41(a)(3)]
2. Duty to Mitigate
The Permittee shall take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in
violation of this permit with a reasonable likelihood of adversely affecting human health or the environment[40
CFR 122.41(d)].
3. Civil and Criminal Liability
Except as provided in permit conditions on"Bypassing"(Part II.C.4),"Upsets"(Part II.C.5)and"Power Failures"
(Part II.C.7),nothing in this permit shall be construed to relieve the Permittee from any responsibilities,liabilities,
or penalties for noncompliance pursuant to NCGS 143-215.3, 143-215.6 or Section 309 of the Federal Act,33 USC
1319. Furthermore,the Permittee is responsible for consequential damages,such as fish kills,even though the
responsibility for effective compliance may be temporarily suspended.
4. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the Permittee
from any responsibilities, liabilities,or penalties to which the Permittee is or may be subject to under NCGS 143-
215.75 et seq.or Section 311 of the Federal Act,33 USG 1321. Furthermore,the Permittee is responsible for
consequential damages,such as fish kills,even though the responsibility for effective compliance may be
temporarily suspended.
5. Property Rights
The issuance of this permit does not convey any property rights in either real or personal property,or any exclusive
privileges,nor does it authorize any injury to private property or any invasion of personal rights,nor any
infringement of Federal,State or local laws or regulations [40 CFR 122.41(g)].
6. Onshore or Offshore Construction
This permit does not authorize or approve the construction of any onshore or offshore physical structures or
facilities or the undertaking of any work in any navigable waters.
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7. Severability
The provisions of this permit are severable. If any provision of this permit,or the application of any provision of
this permit to any circumstances,is held invalid,the application of such provision to other circumstances,and the
remainder of this permit, shall not be affected thereby [NCGS 150B-23].
8. Duty to Provide Information
The Permittee shall furnish to the Permit Issuing Authority,within a reasonable time,any information which the
Permit Issuing Authority may request to determine whether cause exists for modifying,revoking and reissuing,or
terminating this permit or to determine compliance with this permit.The Permittee shall also furnish to the Permit
Issuing Authority upon request,copies of records required by this permit[40 CFR 122.41(h)].
9. Duty to Reapply
If the Permittee wishes to continue an activity regulated by this permit after the expiration date of this permit,the
Permittee must apply for and obtain a new permit[40 CFR 122.41(b)].
10. Expiration of Permit
The Permittee is not authorized to discharge after the expiration date. In order to receive automatic authorization to
discharge beyond the expiration date,the Permittee shall submit such information,forms,and fees as are required
by the agency authorized to issue permits no later than 180 days prior to the expiration date unless permission for a
later date has been granted by the Director.(The Director shall not grant permission for applications to be
submitted later than the expiration date of the existing permit.) [40 CFR 122.21(d)]Any Permittee that has not
requested renewal at least 180 days prior to expiration,or any Permittee that does not have a permit after the
expiration and has not requested renewal at least 180 days prior to expiration,will subject the Permittee to
enforcement procedures as provided in NCGS 143-215.6 and 33 USC 1251 et. seq.
11. Signatory Requirements
All applications,reports,or information submitted to the Permit Issuing Authority shall be signed and certified [40
CFR 122.41(k)].
a. All permit applications shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this Section,a responsible
corporate officer means: (a)a president,secretary,treasurer or vice president of the crporation in charge
of a principal business function,or any other person who performs similar policy or gcision making
functions for the corporation,or(b)the manager of one or more manufacturing,production,or operating
facilities,provided,the manager is authorized to make management decisions which govern the operation
of the regulated facility including having the explicit or implicit duty of making major capital investment
recommendations,and initiating and directing other comprehensive measures to assure long term
environmental compliance with environmental laws and regulations;the manager can ensure that the
necessary systems are established or actions taken to gather complete and accurate information for permit
application requirements;and where authority to sign documents has been assigned or delegated to the
manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor,respectively;or
(3) For a municipality,State,Federal,or other public agency: by either a principal executive officer or
ranking elected official [40 CFR 122.22].
b. All reports required by the permit and other information requested by the Permit Issuing Authority shall be
signed by a person described in paragraph a.above or by a duly authorized representative of that person.A
person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the overall operation
of the regulated facility or activity,such as the position of plant manager,operator of a well or well field,
superintendent,a position of equivalent responsibility,or an individual or position having overall
responsibility for environmental matters for the company. (A duly authorized representative may thus be
either a named individual or any individual occupying a named position.);and
(3) The written authorization is submitted to the Permit Issuing Authority [40 CFR 122.22]
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•c. Changes to authorization: If an authorization under paragraph(b)of this section is no longer accurate because
a different individual or position has responsibility for the overall operation of the facility,a new authorization
satisfying the requirements of paragraph(b)of this section must be submitted to the Director prior to or
together with any reports, information,or applications to be signed by an authorized representative [40 CFR
122.22]
d. Certification.Any person signing a document under paragraphs a.or b.of this section shall make the following
certification [40 CFR 122.22].NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
12. Permit Actions
This permit may be modified,revoked and reissued,or terminated for cause.The filing of a request by the
Permittee for a permit modification,revocation and reissuance,or termination,or a notification of planned changes
or anticipated noncompliance does not stay any permit condition [40 CFR 122.41(f)].
13. Permit Modification,Revocation and Reissuance,or Termination
The issuance of this permit does not prohibit the permit issuing authority from reopening and modifying the permit,
revoking and reissuing the permit,or terminating the permit as allowed by the laws,rules,and regulations
contained in Title 40,Code of Federal Regulations,Parts 122 and 123;Title 15A of the North Carolina
Administrative Code,Subchapter 02H .0100;and North Carolina General Statute 143.215.1 et. al.
14. Annual Administering and Compliance Monitoring Fee Requirements
The Permittee must pay the annual administering and compliance monitoring fee within thirty days after being
billed by the Division. Failure to pay the fee in a timely manner in accordance with 15A NCAC 02H.0105(b)(2)
may cause this Division to initiate action to revoke the permit.
Section C. Operation and Maintenance of Pollution Controls
1. Certified Operator
Owners of classified water pollution control systems must designate operators,certified by the Water Pollution
Control System Operators Certification Commission(WPCSOCC),of the appropriate type and grade for the
system,and, for each classification must[T15A NCAC 08G .0201]:
a. designate one Operator In Responsible Charge(ORC)who possesses a valid certificate of the type and grade at
least equivalent to the type and grade of the system;
b. designate one or more Back-up Operator(s)in Responsible Charge(Back-up ORCs)who possesses a valid
certificate of the type of the system and no more than one grade less than the grade of the system,with the
exception of no backup operator in responsible charge is required for systems whose minimum visitation
requirements are twice per year;and
c. submit a signed completed"Water Pollution Control System Operator Designation Form"to the Commission
(or to the local health department for owners of subsurface systems)countersigned by the designated certified
operators,designating the Operator in Responsible Charge(ORC)and the Back-up Operator in Responsible
Charge(Back-up ORC):
(1) 60 calendar days prior to wastewater or residuals being introduced into a new system;or
(2) within 120 calendar days following:
➢ receiving notification of a change in the classification of the system requiring the designation of a new
Operator in Responsible Charge(ORC)and Back-up Operator in Responsible Charge(Back-up ORC)
of the proper type and grade;or
➢ a vacancy in the position of Operator in Responsible Charge(ORC)or Back-up Operator in
Responsible Charge(Back-up ORC).
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(3) within seven calendar days of vacancies in both ORC and Back-up ORC positions replacing or designating
at least one of the responsibilities.
The ORC of each Class I facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
➢ Visit the facility as often as is necessary to insure proper operation of the treatment system;the treatment
facility must be visited at least weekly
➢ Comply with all other conditions of 15A NCAC 08G .0204.
The ORC of each Class II,III and IV facility(or the Back-up ORC,when acting as surrogate for the ORC)must:
➢ Visit the facility as often as is necessary to insure proper operation of the treatment system;the treatment
facility must be visited at least five days per week,excluding holidays
➢ Properly manage and document daily operation and maintenance of the facility
➢ Comply with all other conditions of 15A NCAC 08G.0204.
2. Proper Operation and Maintenance
The Permittee shall at all times properly operate and maintain all facilities and systems of treatment and control
(and related appurtenances)which are installed or used by the Permittee to achieve compliance with the conditions
of this permit. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality
assurance procedures.This provision requires the Permittee to install and operate backup or auxiliary facilities only
when necessary to achieve compliance with the conditions of the permit[40 CFR 122.41(e)].
NOTE: Properly and officially designated operators are fully responsible for all proper operation and maintenance
of the facility,and all documentation required thereof,whether acting as a contract operator[subcontractor] or a
member of the Permittee's staff.
3. Need to Halt or Reduce not a Defense
It shall not be a defense for a Permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity in order to maintain compliance with the condition of this permit[40 CFR 122.41(c)].
4. Bypassing of Treatment Facilities
a. Bypass not exceeding limitations [40 CFR 122.41(m)(2)]
The Permittee may allow any bypass to occur which does not cause effluent limitations to be exceeded,but
only if it also is for essential maintenance to assure efficient operation.These bypasses are not subject to the
provisions of Paragraphs b.and c. of this section.
b. Notice [40 CFR 122.41(m)(3)]
(1) Anticipated bypass. If the Permittee knows in advance of the need for a bypass,it shall submit prior notice,
if possible at least ten days before the date of the bypass; including an evaluation of the anticipated quality
and effect of the bypass.
(2) Unanticipated bypass.The Permittee shall submit notice of an unanticipated bypass as required in Part
II.E.6. (24-hour notice).
c. Prohibition of Bypass
(1) Bypass from the treatment facility is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for bypass,unless:
(A) Bypass was unavoidable to prevent loss of life,personal injury or severe property damage;
(B) There were no feasible alternatives to the bypass,such as the use of auxiliary treatment facilities,
retention of untreated wastes or maintenance during normal periods of equipment downtime.This
condition is not satisfied if adequate backup equipment should have been installed in the exercise of
reasonable engineering judgment to prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
(C) The Permittee submitted notices as required under Paragraph b.of this section.
(2) Bypass from the collection system is prohibited and the Permit Issuing Authority may take enforcement
action against a Permittee for a bypass as provided in any current or future system-wide collection system
permit associated with the treatment facility.
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/(3) The Permit Issuing Authority may approve an anticipated bypass,after considering its adverse effects,if
the Permit Issuing Authority determines that it will meet the three conditions listed above in Paragraph c.
(1)of this section.
5. Upsets
a. Effect of an upset[40 CFR 122.41(n)(2)]: An upset constitutes an affirmative defense to an action brought for
noncompliance with such technology based permit effluent limitations if the requirements of paragraph b.of
this condition are met.No determination made during administrative review of claims that noncompliance was
caused by upset,and before an action for noncompliance,is final administrative action subject to judicial
review.
b. Conditions necessary for a demonstration of upset:Any Permittee who wishes to establish the affirmative
defense of upset shall demonstrate,through properly signed,contemporaneous operating logs,or other relevant
evidence that:
(1)An upset occurred and that the Permittee can identify the cause(s)of the upset;
(2)The Permittee facility was at the time being properly operated;and
(3)The Permittee submitted notice of the upset as required in Part II.E.6.(b)of this permit.
(4)The Permittee complied with any remedial measures required under Part II.B.2.of this permit.
c. Burden of proof[40 CFR 122.41(n)(4)]: The Permittee seeking to establish the occurrence of an upset has
the burden of proof in any enforcement proceeding.
6. Removed Substances
Solids,sludges,filter backwash,or other pollutants removed in the course of treatment or control of wastewaters
shall be utilized/disposed of in accordance with NCGS 143-215.1 and in a manner such as to prevent any pollutant
from such materials from entering waters of the State or navigable waters of the United States except as permitted
by the Commission.The Permittee shall comply with all applicable state and Federal regulations governing the
disposal of sewage sludge,including 40 CFR 503,Standards for the Use and Disposal of Sewage Sludge;40 CFR
Part 258,Criteria For Municipal Solid Waste Landfills;and 15A NCAC Subchapter 2T,Waste Not Discharged To
Surface Waters.The Permittee shall notify the Permit Issuing Authority of any significant change in its sludge use
or disposal practices.
7. Power Failures
The Permittee is responsible for maintaining adequate safeguards(as required by 15A NCAC 02H .0124)to
prevent the discharge of untreated or inadequately treated wastes during electrical power failures either by means
of alternate power sources,standby generators or retention of inadequately treated effluent.
Section D. Monitoring and Records
Representative Sampling
Samples collected and measurements taken,as required herein, shall be representative of the permitted discharge.
Samples collected at a frequency less than daily shall be taken on a day and time that is representative of the
discharge for the period the sample represents.All samples shall be taken at the monitoring points specified in this
permit and,unless otherwise specified,before the effluent joins or is diluted by any other wastestream,body of
water,or substance.Monitoring points shall not be changed without notification to and the approval of the Permit
Issuing Authority [40 CFR 122.41(j)].
2. Reporting
Monitoring results obtained during the previous month(s)shall be summarized for each month and reported on a
monthly Discharge Monitoring Report(DMR)Form(MR 1, 1.1,2,3)or alternative forms approved by the
Director,postmarked no later than the last calendar day of the month following the completed reporting period.
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. Duplicate signed copies of these,
and all other reports required herein,shall be submitted to the following address:
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NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
3. Flow Measurements
Appropriate flow measurement devices and methods consistent with accepted scientific practices shall be selected
and used to ensure the accuracy and reliability of measurements of the volume of monitored discharges.The
devices shall be installed,calibrated and maintained to ensure that the accuracy of the measurements is consistent
with the accepted capability of that type of device.Devices selected shall be capable of measuring flows with a
maximum deviation of less than 10%from the true discharge rates throughout the range of expected discharge
volumes. Flow measurement devices shall be accurately calibrated at a minimum of once per year and maintained
to ensure that the accuracy of the measurements is consistent with the accepted capability of that type of device.
The Director shall approve the flow measurement device and monitoring location prior to installation.
Once-through condenser cooling water flow monitored by pump logs,or pump hour meters as specified in Part I of
this permit and based on the manufacturer's pump curves shall not be subject to this requirement.
4. Test Procedures
Laboratories used for sample analysis must be certified by the Division.Permittees should contact the Division's
Laboratory Certification Section(919 733-3908)or visit https://deq.nc.gov/about/divisions/water-resources/water-
resources-data/water-sciences-home-page/laboratory-certification-branch for information regarding laboratory
certifications.
Facilities whose personnel are conducting testing of field-certified parameters only must hold the appropriate field
parameter laboratory certifications.
Test procedures for the analysis of pollutants shall conform to the EMC regulations(published pursuant to NCGS
143-215.63 et. seq.),the Water and Air Quality Reporting Acts,and to regulations published pursuant to Section
304(g),33 USC 1314,of the CWA(as amended),and 40 CFR 136;or in the case of sludge use or disposal,
approved under 40 CFR 136,unless otherwise specified in 40 CFR 503,unless other test procedures have been
specified in this permit[40 CFR 122.41].
To meet the intent of the monitoring required by this permit,all test procedures must produce minimum detection
and reporting levels that are below the permit discharge requirements and all data generated must be reported down
to the minimum detection or lower reporting level of the procedure. If no approved methods are determined
capable of achieving minimum detection and reporting levels below permit discharge requirements,then the most
sensitive(method with the lowest possible detection and reporting level)approved method must be used.
5. Penalties for Tampering
The CWA provides that any person who falsifies,tampers with,or knowingly renders inaccurate,any monitoring
device or method required to be maintained under this permit shall,upon conviction,be punished by a fine of not
more than$10,000 per violation,or by imprisonment for not more than two years per violation,or by both. If a
conviction of a person is for a violation committed after a first conviction of such person under this paragraph,
punishment is a fine of not more than$20,000 per day of violation,or by imprisonment of not more than 4 years,
or both [40 CFR 122.41].
6. Records Retention
Except for records of monitoring information required by this permit related to the Permittee's sewage sludge use
and disposal activities,which shall be retained for a period of at least five years(or longer as required by 40 CFR
503),the Permittee shall retain records of all monitoring information,including:
➢ all calibration and maintenance records
> all original strip chart recordings for continuous monitoring instrumentation
> copies of all reports required by this permit
➢ copies of all data used to complete the application for this permit
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These records or copies shall be maintained for a period of at least 3 years from the date of the sample,
measurement,report or application.This period may be extended by request of the Director at any time [40 CFR
122.41].
7. Recording Results
For each measurement or sample taken pursuant to the requirements of this permit,the Permittee shall record the
following information [40 CFR 122.41]:
a. The date,exact place,and time of sampling or measurements;
b. The individual(s)who performed the sampling or measurements;
c. The date(s)analyses were performed;
d. The individual(s)who performed the analyses;
e. The analytical techniques or methods used;and
f. The results of such analyses.
8. Inspection and Entry
The Permittee shall allow the Director,or an authorized representative(including an authorized contractor acting as
a representative of the Director),upon the presentation of credentials and other documents as may be required by
law,to;
a. Enter,at reasonable times,upon the Permittee's premises where a regulated facility or activity is located or
conducted,or where records must be kept under the conditions of this permit;
b. Have access to and copy,at reasonable times,any records that must be kept under the conditions of this permit;
c. Inspect at reasonable times any facilities,equipment(including monitoring and control equipment),practices,
or operations regulated or required under this permit; and
d. Sample or monitor at reasonable times,for the purposes of assuring permit compliance or as otherwise
authorized by the CWA,any substances or parameters at any location[40 CFR 122.41(i)].
Section E Reporting Requirements
I. Change in Discharge
All discharges authorized herein shall be consistent with the terms and conditions of this permit. The discharge of
any pollutant identified in this permit more frequently than or at a level in excess of that authorized shall constitute
a violation of the permit.
2. Planned Changes
The Permittee shall give notice to the Director as soon as possible of any planned physical alterations or additions
to the permitted facility [40 CFR 122.41(1)].Notice is required only when:
a. The alteration or addition to a permitted facility may meet one of the criteria for new sources at 40 CFR
122.29(b);or
b. The alteration or addition could significantly change the nature or increase the quantity of pollutants
discharged.This notification applies to pollutants subject neither to effluent limitations in the permit,nor to
notification requirements under 40 CFR 122.42(a)(1); or
c. The alteration or addition results in a significant change in the Permittee's sludge use or disposal practices,and
such alteration,addition or change may justify the application of permit conditions that are different from or
absent in the existing permit, including notification of additional use or disposal sites not reported during the
permit application process or not reported pursuant to an approved land application plan.
3. Anticipated Noncompliance
The Permittee shall give advance notice to the Director of any planned changes to the permitted facility or other
activities that might result in noncompliance with the permit[40 CFR 122.41(1)(2)].
4. Transfers
This permit is not transferable to any person without prior written notice to and approval from the Director in
accordance with 40 CFR 122.61.The Director may condition approval in accordance with NCGS 143-215.1,in
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particular NCGS 143-215.1(b)(4)b.2.,and may require modification or revocation and reissuance of the permit,or
a minor modification,to identify the new permittee and incorporate such other requirements as may be necessary
under the CWA [40 CFR 122.41(1)(3), 122.61]or state statute.
5. Monitoring Reports
Monitoring results shall be reported at the intervals specified elsewhere in this permit[40 CFR 122.41(1)(4)].
a. Monitoring results must be reported on a Discharge Monitoring Report(DMR)(See Part II.D.2)or forms
provided by the Director for reporting results of monitoring of sludge use or disposal practices.
b. If the Permittee monitors any pollutant more frequently than required by this permit using test procedures
approved under 40 CFR Part 136 and at a sampling location specified in this permit or other appropriate
instrument governing the discharge,the results of such monitoring shall be included in the calculation and
reporting of the data submitted on the DMR.
6. Twenty-four Hour Reporting
a. The Permittee shall report to the Director or the appropriate Regional Office any noncompliance that
potentially threatens public health or the environment.Any information shall be provided orally within 24
hours from the time the Permittee became aware of the circumstances.A written submission shall also be
provided within 5 days of the time the Permittee becomes aware of the circumstances.The written submission
shall contain a description of the noncompliance,and its cause;the period of noncompliance,including exact
dates and times,and if the noncompliance has not been corrected,the anticipated time it is expected to
continue;and steps taken or planned to reduce,eliminate,and prevent reoccurrence of the noncompliance[40
CFR 122.41(1)(6)].
b. The Director may waive the written report on a case-by-case basis for reports under this section if the oral
report has been received within 24 hours.
c. Occurrences outside normal business hours may also be reported to the Division's Emergency Response
personnel at(800)858-0368 or(919)733-3300.
7. Other Noncompliance
The Permittee shall report all instances of noncompliance not reported under Part II.E.5 and 6.of this permit at the
time monitoring reports are submitted.The reports shall contain the information listed in Part II.E.6.of this permit
[40 CFR 122.41(1)(7)].
8. Other Information
Where the Permittee becomes aware that it failed to submit any relevant facts in a permit application,or submitted
incorrect information in a permit application or in any report to the Director, it shall promptly submit such facts or
information[40 CFR 122.41(1)(8)].
9. Noncompliance Notification
The Permittee shall report by telephone to either the central office or the appropriate regional office of the Division
as soon as possible,but in no case more than 24 hours or on the next working day following the occurrence or first
knowledge of the occurrence of any of the following:
a. Any occurrence at the water pollution control facility which results in the discharge of significant amounts of
wastes which are abnormal in quantity or characteristic,such as the dumping of the contents of a sludge
digester;the known passage of a slug of hazardous substance through the facility;or any other unusual
circumstances.
b. Any process unit failure,due to known or unknown reasons,that render the facility incapable of adequate
wastewater treatment such as mechanical or electrical failures of pumps,aerators,compressors,etc.
c. Any failure of a pumping station, sewer line,or treatment facility resulting in a by-pass without treatment of all
or any portion of the influent to such station or facility.
Persons reporting such occurrences by telephone shall also file a written report within 5 days following first
knowledge of the occurrence.Also see reporting requirements for municipalities in Part IV.C.2.c.of this permit.
10. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3 (a)(2)or Section 308 of the Federal Act,33
USC 1318,all reports prepared in accordance with the terms shall be available for public inspection at the offices
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of the Division.As required by the Act,effluent data shall not be considered confidential. Knowingly making any
false statement on any such report may result in the imposition of criminal penalties as provided for in NCGS 143-
215.1(b)(2)or in Section 309 of the Federal Act.
11. Penalties for Falsification of Reports
The CWA provides that any person who knowingly makes any false statement,representation,or certification in
any record or other document submitted or required to be maintained under this permit, including monitoring
reports or reports of compliance or noncompliance shall,upon conviction,be punished by a fine of not more than
$25,000 per violation,or by imprisonment for not more than two years per violation,or by both [40 CFR 122.41].
12. Annual Performance Reports
Permittees who own or operate facilities that primarily collect or treat municipal or domestic wastewater and have
an average annual flow greater than 200,000 gallons per day shall provide an annual report to the Permit Issuing
Authority and to the users/customers served by the Permittee(NCGS 143-215.1C).The report shall summarize the
performance of the collection or treatment system,as well as the extent to which the facility was compliant with
applicable Federal or State laws,regulations and rules pertaining to water quality.The report shall be provided no
later than sixty days after the end of the calendar or fiscal year,depending upon which annual period is used for
evaluation.
The report shall be sent to:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION:Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
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PART III
OTHER REQUIREMENTS
Section A. Construction
a. The Permittee shall not commence construction of wastewater treatment facilities,nor add to the plant's treatment
capacity,nor change the treatment process(es)utilized at the treatment plant unless(1)the Division has issued an
Authorization to Construct(AtC)permit or(2)the Permittee is exempted from such AtC permit requirements
under Item b. of this Section.
b. In accordance with NCGS 143-215.1(a5) [SL 2011-394],no permit shall be required to enter into a contract for the
construction,installation,or alteration of any treatment work or disposal system or to construct,install,or alter any
treatment works or disposal system within the State when the system's or work's principle function is to conduct,
treat,equalize,neutralize, stabilize,recycle,or dispose of industrial waste or sewage from an industrial facility and
the discharge of the industrial waste or sewage is authorized under a permit issued for the discharge of the
industrial waste or sewage into the waters of the State. Notwithstanding the above,the permit issued for the
discharge may be modified if required by federal regulation.
c. Issuance of an AtC will not occur until Final Plans and Specifications for the proposed construction have been
submitted by the Permittee and approved by the Division.
Section B. Groundwater Monitoring
The Permittee shall,upon written notice from the Director,conduct groundwater monitoring as may be required to
determine the compliance of this NPDES permitted facility with the current groundwater standards.
Section C. Changes in Discharges of Toxic Substances
The Permittee shall notify the Permit Issuing Authority as soon as it knows or has reason to believe(40 CFR 122.42):
a. That any activity has occurred or will occur which would result in the discharge,on a routine or frequent basis,of
any toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the following
"notification levels";
(1) One hundred micrograms per liter(100 µg/L);
(2) Two hundred micrograms per liter(200 µg/L)for acrolein and acrylonitrile; five hundred micrograms per liter
(500 µg/L)for 2,4-dinitrophenol and for 2-methyl-4,6-dinitrophenol;and one milligram per liter(1 mg/L)for
antimony;
(3) Five times the maximum concentration value reported for that pollutant in the permit application.
b. That any activity has occurred or will occur which would result in any discharge,on a non-routine or infrequent
basis,of a toxic pollutant which is not limited in the permit,if that discharge will exceed the highest of the
following"notification levels";
(1) Five hundred micrograms per liter(500 µg/L);
(2) One milligram per liter(1 mg/L)for antimony;
(3) Ten times the maximum concentration value reported for that pollutant in the permit application.
Section D. Facility Closure Requirements
The Permittee must notify the Division at least 90 days prior to the closure of any wastewater treatment system covered
by this permit.The Division may require specific measures during deactivation of the system to prevent adverse
impacts to waters of the State. This permit cannot be rescinded while any activities requiring this permit continue at the
permitted facility.
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PART IV
SPECIAL CONDITIONS FOR MUNICIPAL FACILITIES
Section A. Definitions
In addition to the definitions in Part II of this permit,the following definitions apply to municipal facilities:
Indirect Discharge or Industrial User
Any non-domestic source that discharges wastewater containing pollutants into a POTW regulated under section
307(b),(c)or(d)of the CWA. [40 CFR 403.3 (i)and(j)and 15A NCAC 02H.0903(b)(11)]
Interference
Inhibition or disruption of the POTW treatment processes;operations;or its sludge process,use,or disposal which
causes or contributes to a violation of any requirement of the Permittee's(or any satellite POTW's if different from the
Permittee)NPDES,collection system,or non-discharge permit or prevents sewage sludge use or disposal in
compliance with specified applicable State and Federal statutes,regulations,or permits. [15A NCAC 02H
.0903(b)(14)]
Pass Through
A discharge which exits the POTW into waters of the State in quantities or concentrations which,alone or with
discharges from other sources,causes a violation,including an increase in the magnitude or duration of a violation,of
the Permittee's(or any satellite POTW's,if different from the Permittee)NPDES,collection system,or non-discharge
permit. 15A NCAC 02H .0903(b)(23)]
Publicly Owned Treatment Works(POTW)
A treatment works as defined by Section 212 of the CWA,which is owned by a State or local government organization.
This definition includes any devices and systems used in the storage,treatment,recycling and reclamation of municipal
sewage or industrial wastes of a liquid nature. It also includes the collection system,as defined in 15A NCAC 2T
.0402,only if it conveys wastewater to a POTW treatment plant. The term also means the local government
organization,or municipality,as defined in section 502(4)of the CWA,which has jurisdiction over indirect discharges
to and the discharges from such a treatment works. In this context,the organization may be the owner of the POTW
treatment plant or the owner of the collection system into which an indirect discharger discharges.This second type of
POTW may be referred to as a"satellite POTW organization." [15A NCAC 02H .0903(b)(26)]
"Significant Industrial User"or"SIU"
An Industrial User that discharges wastewater into a publicly owned treatment works and that [15A NCAC 02H
.0903(b)(33)]:
1. Discharges an average of 25,000 gallons per day or more of process wastewater to the POTW(excluding sanitary,
noncontact cooling and boiler blowdown wastewaters);or
2. Contributes process wastewater which makes up five percent or more of the NPDES or non-discharge permitted
flow limit or organic capacity of the POTW treatment plant. In this context,organic capacity refers to BOD,TSS
and ammonia; or
3. Is subject to categorical standards under 40 CFR Part 403.6 and 40 CFR Parts 405-471;or
4. Is designated as such by the Permittee on the basis that the Industrial User has a reasonable potential for adversely
affecting the POTW's operation or for violating any pretreatment standard or requirement,or the POTW's effluent
limitations and conditions in its NPDES or non-discharge permit,or to limit the POTW's sludge disposal options;
5. Subject to approval under 15A NCAC 02H.0907(b),the Permittee may determine that an Industrial User meeting
the criteria in paragraphs 1 or 2 of this definition above has no reasonable potential for adversely affecting the
POTW's operation or for violating any pretreatment standard or requirement,the POTW's effluent limitations and
conditions in its NPDES or non-discharge permit,or to limit the POTW's sludge disposal options,and thus is not a
Significant Industrial User(SIU);or
6. Subject to approval under 15A NCAC 02H .0907 b the Permittee maydetermine that an Industrial User meeting
PP ( )�
the criteria in paragraph 3 of this definition above meets the requirements of 40 CFR Part 403.3(v)(2)and thus is a
non-significant categorical Industrial User.
Section B. Publicly Owned Treatment Works(POTWs)
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All POTWs must provide adequate notice to the Director of the following[40 CFR 122.42(b)]:
1. Any new introduction of pollutants into the POTW from an indirect discharger,regardless of the means of
transport,which would be subject to section 301 or 306 of CWA if it were directly discharging those pollutants;
and
2. Any substantial change in the volume or character of pollutants being introduced by an indirect discharger as
influent to that POTW at the time of issuance of the permit.
3. For purposes of this paragraph,adequate notice shall include information on(1)the quality and quantity of effluent
introduced into the POTW,and(2)any anticipated impact that may result from the change of the quantity or
quality of effluent to be discharged from the POTW.
Section C. Municipal Control of Pollutants from Industrial Users.
1. Effluent limitations are listed in Part I of this permit. Other pollutants attributable to inputs from Industrial Users
discharging to the POTW may be present in the Permittee's discharge.At such time as sufficient information
becomes available to establish limitations for such pollutants,this permit may be revised to specify effluent
limitations for any or all of such other pollutants in accordance with best practicable technology or water quality
standards.
2. Prohibited Discharges
a. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibition against the
introduction of pollutants or discharges into the waste treatment system or waste collection system which
cause or contribute to Pass Through or Interference as defined in 15A NCAC 02H .0900 and 40 CFR 403. [40
CFR 403.5(a)(1)]
b. The Permittee shall develop and enforce their Pretreatment Program to implement the prohibitions against the
introduction of the following wastes in the waste treatment or waste collection system [40 CFR 403.5(b)]:
(1) Pollutants which create a fire or explosion hazard in the POTW, including,but not limited to,
wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Centigrade
using the test methods specified in 40 CFR 261.21;
(2) Pollutts which cause corrosive structural damage to the POTW,but in no case discharges with pH lower
than 5.t,unless the works is specifically designed to accommodate such discharges;
(3) Solid—or viscous pollutants in amounts which cause obstruction to the flow in the POTW resulting in
Interference;
(4) Any pollutant,including oxygen demanding pollutants(BOD,etc.)released in a Discharge at a flow rate
and/or pollutant concentration which will cause Interference with the POTW;
(5) Heat in amounts which will inhibit biological activity in the POTW resulting in Interference,but in no
case heat in such quantities that the temperature at the POTW Treatment Plant exceeds 40°C(104°F)
unless the Division,upon request of the POTW,approves alternate temperature limits;
(6) Petroleum oil,non-biodegradable cutting oil,or products of mineral oil origin in amounts that will cause
Interference or Pass Through;
(7) Pollutants which result in the presence of toxic gases,vapors,or fumes within the POTW in a quantity that
may cause acute worker health and safety problems;or
(8) Any trucked or hauled pollutants,except at discharge points designated by the POTW.
c. The Permittee shall investigate the source of all discharges into the POTW,including slug loads and other
unusual discharges,which have the potential to adversely impact the Permittee's Pretreatment Program and/or
the operation of the POTW.
The Permittee shall report such discharges into the POTW to the Director or the appropriate Regional Office.
Any information shall be provided orally within 24 hours from the time the Permittee became aware of the
circumstances.A written submission shall also be provided within 5 days of the time the Permittee becomes
aware of the circumstances.The written submission shall contain a description of the discharge;the
investigation into possible sources;the period of the discharge,including exact dates and times; if the
discharge has not ceased,the anticipated time it is expected to continue; and steps taken or planned to reduce,
eliminate,and prevent reoccurrence of the noncompliance,
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3. With regard to the effluent requirements listed in Part I of this permit, it may be necessary for the Permittee to
supplement the requirements of the Federal Pretreatment Standards(40 CFR,Part 403)to ensure compliance by
the Permittee with all applicable effluent limitations. Such actions by the Permittee may be necessary regarding
some or all of the industries discharging to the municipal system.
4. The Permittee shall require any Industrial User(IU)discharging to the POTW to meet Federal Pretreatment
Standards developed under Section 307(b)of the Act as amended(which includes categorical standards and
specific local limits,best management practices and narrative requirements).Prior to accepting wastewater from
any Significant Industrial User(SIU),the Permittee shall either develop and submit to the Division a new
Pretreatment Program or,as necessary,a modification of an existing Pretreatment Program,for approval as
required under section D below as well as 15A NCAC 02H .0907(a)and(b). [40 CFR 122.44(j)(2)]
5. This permit shall be modified,or alternatively,revoked and reissued,to incorporate or modify an approved POTW
Pretreatment Program or to include a compliance schedule for the development of a POTW Pretreatment Program
as required under Section 402(b)(8)of the CWA and implementing regulations or by the requirements of the
approved State pretreatment program,as appropriate.
Section D. Pretreatment Programs
Under authority of sections 307(b)and(c)and 402(b)(8)of the CWA and implementing regulations 40 CFR 403,
North Carolina General Statute 143-215.3(14)and implementing regulations 15A NCAC 02H .0900,and in accordance
with the approved pretreatment program,all provisions and regulations contained and referenced in the pretreatment
program submittal are an enforceable part of this permit. [40 CFR 122.44(j)(2)]
The Permittee shall operate its approved pretreatment program in accordance with Section 402(b)(8)of the CWA,40
CFR 403, 15A NCAC 02H .0900,and the legal authorities,policies,procedures,and financial provisions contained in
its pretreatment program submission and Division approved modifications thereof. Such operation shall include but is
not limited to the implementation of the following conditions and requirements.Terms not defined in Part II or Part IV
of this permit are as defined in 15A NCAC 02H .0903 and 40 CFR 403.3.
1. Sewer Use Ordinance(SUO)
The Permittee shall maintain adequate legal authority to implement its approved pretreatment program. [15A
NCAC 02H .0903(b)(32),.0905 and.0906(b)(1);40 CFR 403.8(f)(1)and 403.9(b)(1)and(2)]
2. Industrial Waste Survey(IWS)
The Permittee shall implement an IWS consisting of the survey of users of the POTW collection system or
treatment plant,as required by 40 CFR 403.8(f)(2)(i-iii)and 15A NCAC 02H.0905 [also 40 CFR 122.44(j)(1)],
including identification of all Industrial Users that may have an impact on the POTW and the character and amount
of pollutants contributed to the POTW by these Industrial Users and identification of those Industrial Users
meeting the definition of SIU. Where the Permittee accepts wastewater from one or more satellite POTWs,the
IWS for the Permittee shall address all satellite POTW services areas,unless the pretreatment program in those
satellite service areas is administered by a separate Permittee with an approved Pretreatment Program.The
Permittee shall submit a summary of its IWS activities to the Division at least once every five years,and as
required by the Division.The IWS submission shall include a summary of any investigations conducted under
paragraph C.2.c.of this Part. [15A NCAC 02H.0903(b)(13), .0905 and.0906(b)(2);40 CFR 403.8(0(2)and 403.9]
3. Monitoring Plan
The Permittee shall implement a Division-approved Monitoring Plan for the collection of facility specific data to
be used in a wastewater treatment plant Headworks Analysis(HWA)for the development of specific pretreatment
local limits.Effluent data from the Plan shall be reported on the DMRs(as required by Parts II.D and II.E.5.). [15A
NCAC 02H .0903(b)(16), .0906(b)(3)and.0905]
4. Headworks Analysis(HWA)and Local Limits
The Permittee shall obtain Division approval of a HWA at least once every five years,and as required by the
Division. Within 180 days of the effective date of this permit(or any subsequent permit modification)the
Permittee shall submit to the Division a written technical evaluation of the need to revise local limits(i.e.,an
updated HWA or documentation of why one is not needed) [40 CFR 122.44].The Permittee shall develop, in
accordance with 40 CFR 403.5(c)and 15A NCAC 02H .0909,specific Local Limits to implement the prohibitions
listed in 40 CFR 403.5(a)and(b)and 15A NCAC 02H .0909.Pursuant to 40 CFR 403.5,local limits are
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enforceable Pretreatment Standards as defined by 40 CFR 403.3(1). [15A NCAC 02H .0903(b)(10), .0905,and
.0906(b)(4)]
5. Industrial User Pretreatment Permits(IUP)&Allocation Tables
In accordance with NCGS 143-215.1,the Permittee shall issue to all Significant Industrial Users,permits for
operation of pretreatment equipment and discharge to the Permittee's collection system or treatment works.These
permits shall contain limitations,sampling protocols,reporting requirements,appropriate standard and special
conditions,and compliance schedules as necessary for the installation of treatment and control technologies to
assure that their wastewater discharge will meet all applicable pretreatment standards and requirements.The
Permittee shall maintain a current Allocation Table(AT)which summarizes the results of the HWA and the limits
from all IUPs.Permitted IUP loadings for each parameter cannot exceed the treatment capacity of the POTW as
determined by the HWA. [15A NCAC 02H .0906(b)(6), .0909, .0916,and.0917;40 CFR 403.5,403.8(0(l)(iii);
NCGS 143-215.67(a)]
6. Authorization to Construct(AtC)
The Permittee shall ensure that an Authorization to Construct permit(AtC)is issued to all applicable Industrial
Users for the construction or modification of any pretreatment facility. Prior to the issuance of an AtC,the
proposed pretreatment facility and treatment process must be evaluated for its capacity to comply with all
Industrial User Pretreatment Permit(IUP)limitations. [15A NCAC 02H .0906(b)(7)and.0905;NCGS 143-
215.1(a)(8)]
7. POTW Inspection&Monitoring of their IUs
The Permittee shall conduct inspection, surveillance,and monitoring activities as described in its Division
approved pretreatment program in order to determine,independent of information supplied by Industrial Users,
compliance with applicable pretreatment standards. [15A NCAC 02H .0908(e);40 CFR 403.8(f)(2)(v)] The
Permittee must:
a. Inspect all Significant Industrial Users(SIUs)at least once per calendar year;
b. Sample all Significant Industrial Users(SIUs)at least once per calendar year for all SIU permit-limited
parameters including flow except as allowed under 15A NCAC .0908(e);and
c. At least once per year,document an evaluation of any non-significant categorical Industrial User for
compliance with the requirements in 40 CFR 403.3(v)(2),and either continue or revoke the designation as non-
significant.
8. IU Self Monitoring and Reporting
The Permittee shall require all Industrial Users to comply with the applicable monitoring and reporting
requirements outlined in the Division-approved pretreatment program,the industry's pretreatment permit,or in 15A
NCAC 02H .0908. 15A NCAC 02H .0906(b)(5)and.0905;40 CFR 403.8 1 v and 2 iii •40 CFR
122.44(j)(2)and 40 CFR 403.12]
9. Enforcement Response Plan(ERP)
The Permittee shall enforce and obtain appropriate remedies for violations of all pretreatment standards
promulgated pursuant to section 307(b)and(c)of the CWA(40 CFR 405 et. seq.),prohibitive discharge standards
as set forth in 40 CFR 403.5 and 15A NCAC 02H .0909,specific local limitations,and other pretreatment
requirements.All remedies,enforcement actions and other,shall be consistent with the Enforcement Response
Plan(ERP)approved by the Division. [15A NCAC 02H .0903(b)(7),.0906(b)(8)and.0905;40 CFR 403.8(0(5)]
10. Pretreatment Annual Reports(PAR)
The Permittee shall report to the Division in accordance with 15A NCAC 02H .0908. In lieu of submitting annual
reports,Modified Pretreatment Programs developed under 15A NCAC 02H .0904(b)may be required to submit a
partial annual report or to meet with Division personnel periodically to discuss enforcement of pretreatment
requirements and other pretreatment implementation issues.
For all other active pretreatment programs,the Permittee shall submit two copies of a Pretreatment Annual Report
(PAR)describing its pretreatment activities over the previous calendar year to the Division at the following
address:
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NC DEQ/Division of Water Resources/Water Quality Permitting Section
Pretreatment,Emergency Response,and Collection Systems(PERCS)Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
These reports shall be submitted by March 1 of each year and shall contain the following:
a. Narrative
A narrative summary detailing actions taken,or proposed,by the Permittee to correct significant non-
compliance and to ensure compliance with pretreatment requirements;
b. Pretreatment Program Summary(PPS)
A pretreatment program summary(PPS)on forms or in a format provided by the Division;
c. Significant Non-Compliance Report(SNCR)
A list of Industrial Users(IUs)in significant noncompliance(SNC)with pretreatment requirements,and the
nature of the violations on forms or in a format provided by the Division;
d. Industrial Data Summary Forms(IDSF)
Monitoring data from samples collected by both the POTW and the Significant Industrial Users(SIUs).These
analytical results must be reported on Industrial Data Summary Forms(IDSF)or on other forms or in a format
provided by the Division;
e. Other Information
Copies of the POTW's allocation table,new or modified enforcement compliance schedules,public notice of
IUs in SNC,a summary of data or other information related to significant noncompliance determinations for
IUs that are not considered SIUs,and any other information,upon request,which in the opinion of the Director
is needed to determine compliance with the pretreatment implementation requirements of this permit;
11. Public Notice
The Permittee shall publish annually a list of Industrial Users(IUs)that were in significant noncompliance(SNC)
as defined in the Permittee's Division-approved Sewer Use Ordinance with applicable pretreatment requirements
and standards during the previous twelve month period.This list shall be published within four months of the
applicable twelve-month period. [15A NCAC 02H .0903(b)(34),.0908(b)(5)and.0905 and 40 CFR
403.8(f)(2)(viii)]
12. Record Keeping
The Permittee shall retain for a minimum of three years records of monitoring activities and results,along with
support information including general records,water quality records,and records of industrial impact on the
POTW and shall retain all other Pretreatment Program records as required by 15A NCAC 02H .0908(f). [15A
NCAC 02H.0908(f);40 CFR 403.12(o)]
13. Pretreatment Program Resources
The Permittee shall maintain adequate funding and qualified personnel to accomplish the objectives of its approved
pretreatment program.and retain a written description of those current levels of inspection. [15A NCAC 02H
.0906(b)(9)and(10)and.0905;40 CFR 403.8(f)(3),403.9(b)(3)]
14. Modification to Pretreatment Programs
Modifications to the approved pretreatment program including but not limited to local limits modifications,POTW
monitoring of their Significant Industrial Users(SIUs),and Monitoring Plan modifications,shall be considered a
permit modification and shall be governed by 40 CFR 403.18, 15 NCAC 02H .0114 and 15A NCAC 02H .0907.
Version 11/09/2011.2

Fact Sheet
NPDES Permit No. NC0046728
Permit Writer/Email Contact Min Xiao,inin.xiaogncdeur.gov:
Date: July 18, 2019
Division/Branch:NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template:Version 09Jan2017
Permitting Action:
El Renewal
❑ Renewal with Expansion
❑ New Discharge
O Modification(Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers,EPA Form 2A or 2D requirements,Engineering Alternatives Analysis,Fee
„a
• For ExistingDischargers POTW EPA Form 2A, 3 effluentpollutant scans,4 2 species WET
g ( ), P
tests.
• For Existing Dischargers(Non-POTW),EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable,enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name: Town of Mooresville/Rocky River WWTP
Applicant Address: PO Box 878 Mooresville,NC 28115
Facility Address: 369 Johnson Dairy Road,Mooresville,NC 28115
Permitted Flow: 7.5 MGD
Facility Type/Waste: Major Municipal/Domestic& Industrial Wastewater
Facility Class: Grade IV
Treatment Units: Influent screw pump station; Two equalization tanks; Dual mechanical
screens;Two dual aeration basins(mechanical fixed aerators);Two dual
final clarifiers; Mixing tower; Micro screen rotary disc filtration; Dual
UV channels using TrojanUV3000plusTM system; A series of cascades;
RAS/WAS pumps; Two aerobic digesters (diffused air); A filter belt
press; Covered sludge storage area; Four standby generators
Pretreatment Program(Y/N) Y
County: Ircdcl I
Region Mooresville
Page 1 of 11

Briefly describe the proposed permitting action and facility background: Iredell County has applied for
an NPDES permit renewal at 7.5 MGD for the Rocky River WWTP in May 2018. This facility serves a
population of 35,000 residents within Town of Mooresville and operates a pretreatment program currently
with three Significant Industrial Users(SIUs).The facility has an Outfall 001 that discharges to Dye
Creek(Branch),which is currently classified C water in Yadkin-Pee Dee River Basin.
2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s): Outfall OOI nye Creek (Branch)
Stream Segment: 13-17-2
Stream Classification: C
Drainage Area(mi2): 4.8
Summer 7Q10(cfs) 0.5
Winter 7Q10(cfs): 0.9
30Q2(cfs): 1.1
Average Flow(cfs): 5
IWC(%effluent): 96%at 7.5 MGD
303(d)listed/parameter: Yes/Benthos
Subject to TMDL/parameter: Yes-State wide Mercury TMDL implementation.
Basin/Sub-basinfHUC: 03-07-11/030401050102
USGS Topo Quad: E15SE
3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of June 2016 through May 2019.
Table 1. Effluent Data Summary Outfall 001
Parameter Units Average Max Min Permit Limit
Flow y1( d ) I1 10.3'> 2.77 MA 7.5
WA 7.5
BOD summer _ 18.00 0 MA 5.0
BOD winter mg/1 <2.93 42.00 0 WA 15.0
MA 10.0
Page 2 of 11 •

NH3N summer mg/1 < 0.20 I ti MA 3.0
p)
MA 1.0
NH3N winter mg/I <0.20 O
WA 6.0
MA 2.0
TSS mg/1 <4.47 44 WA 45.0
MA 30.0
pH SU 7.42 8.00 6.0<pH<9.0
(geometric)
Fecal coliform #/100 ml 29.05 1910.00 1.00 WA 400
MA 200
DO mg/1 8.99 11.26 DA>6.0
DM 17.0 (<
TRC µg/I 15.82 0 50
compliance)
Cyanide ug/1 6.67 8.00 0 DM 22.8
MA 5.0
MA-Monthly Average,WA-Weekly Average,DM-Daily Maximum,DA=Daily Average
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1)to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow;2)to
verify model predictions for outfall diffuser; 3)to provide data for future TMDL;4)based on other
instream concerns. Instream monitoring may be conducted by the Permittee,and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee(in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: The current permit requires instream monitoring for dissolved oxygen and temperature.
Because the facility is a participant in the Yadkin-Pee Dee River Basin Association,the instream
monitoring requirements are waived. The closest downstream station is Q7330000(no upstream station
available),which is located at Rocky River at SR 2420(E. Rocky River Road)near Davidson.The
monitoring data of this station ranging from January 2016 to December 2018 were reviewed and
summarized in table 2.
Table 2. Instream Data Summary
Parameter Units Minimum Maximum Average
Dissolved Oxygen mg/1 6.30 11.10 7.92
Temperature deg c 3.80 26.80 18.04
Note: Instream data are summarized for the period of January 2016 through December 2018.
Page 3 of 11

DO ranged from 6.3 to 11.1 mg/L,which indicated a minimum daily average of 5.0 mg/L was maintained
in the receiving stream [per 15A NCAC 02B .0211(6)].
Temperature ranged from 3.8 to 26.8 degrees Celsius.The maximum temperatures were less than 29
degrees Celsius, which met the requirement per 15A NCAC 02B .0211(18).
This draft permit maintains the same instream monitoring requirements.
Is this facility a member of a Monitoring Coalition with waived instream monitoring(Y/N): Y
Name of Monitoring Coalition: Yadkin-Pee Dee River Basin Association
5. Compliance Summary
Summarize the compliance record with permit effluent limits(past 5 years): The facility reported one
monthly Fecal Coliform limit violation (NOV) in May, 2017.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 20 of 20 quarterly chronic toxicity tests,as well as all 4 second species
chronic toxicity tests.
Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in November, 2017 reported that the facility was well maintained and operated.
6. Water Quality-Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206,the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q 10 streamflow(acute Aquatic Life); 7Q10 streamflow(chronic Aquatic
Life;non-carcinogen HH);30Q2 streamflow(aesthetics); annual average flow(carcinogen,HH).
If applicable, describe any other dilution factors considered(e.g., based on CORAIIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B.0204(b): NA
Oxygen-Consuming Waste Limitations
Limitations for oxygen-consuming waste(e.g.,BOD)are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen(DO)water quality standard. Secondary TBEL limits
(e.g.,BOD=30 mg/1 for Municipals)may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: DWR issued
speculative limits for an expanded discharge of 19.0 MGD in 2007,which included a BOD5 limit of 5.0
mg/I,NH3 as N limit of 1.0 mg/I, and a DO of 6.0 mg/l,based on recommendations contained in the 2003
Yadkin-Pee Dee Basinwide Water Quality Management Plan.These limits were applied to the 7.5 MGD
expansion that the Town decided to implement.
Page 4 of 11

Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/1(summer)and 1.8 mg/1(winter). Acute ammonia limits are derived from chronic criteria,
utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non-Municipals.
Limitations for Total Residual Chlorine(TRC)are based on the NC water quality standard for protection
of aquatic life(17 ug/l)and capped at 28 ug/1(acute impacts). Due to analytical issues,all TRC values
reported below 50 ug/1 are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal:There are no
proposed changes.The existing limitations are protective, see the attached NH3/TRC WRA calculations.
Reasonable Potential Analysis(RPA)for Toxicants •
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards,a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44(d)(i). The NC
RPA procedure utilizes the following: 1)95%Confidence Leve1/95%Probability;2)assumption of zero
background; 3)use of%2 detection limit for"less than"values; and 4)streamflows used for dilution
consideration based on 15A NCAC 2B.0206.Effective April 6,2016,NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards,dated June 10,2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between December
2014 and May 2019. Pollutants of concern included toxicants with positive detections and associated
water quality standards/criteria. Based on this analysis,the following permitting actions are proposed for
this permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality-based
effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable
water quality standards/criteria: Copper
• Monitoring Only. The following parameters will receive a monitor-only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria,
but the maximum predicted concentration was>50%of the allowable concentration: NA
• No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria and the maximum predicted concentration was<50%of the allowable
concentration: Arsenic, Beryllium, Cadmium, Total Chromium,Cyanide, Lead,Molybdenum,
Nickel, Selenium, Silver,Zinc
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern.
o The following parameter(s)will receive a water quality-based effluent limit(WQBEL)
with monitoring, since as part of a limited data set,two samples exceeded the allowable
discharge concentration: NA
o The following parameter(s)will receive a monitor-only requirement, since as part of a
limited data set,one sample exceeded the allowable discharge concentration: NA
Page 5 of 11

Attached are the RPA results, as well as a copy of the guidance entitled "NPDES Implementation of
hzstream Dissolved Metals Standards—Freshwater Standards".
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity(WET)have been established in
accordance with Division guidance(per WET Memo, 8/2/1999). Per WET guidance,all NPDES permits
issued to Major facilities or any facility discharging"complex"wastewater(contains anything other than
domestic waste)will contain appropriate WET limits and monitoring requirements,with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits,using single concentration screening tests,with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: This is a Major POTW,and a chronic WET limit using
Ceriodaphnia dubia at 90%effluent will continue on a quarterly frequency.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply
with EPA's mercury fish tissue criteria(0.3 mg/kg)for human health protection.The TMDL established a
wasteload allocation for point sources of 37 kg/year(81 lb/year),and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources(^-2%of total load),the TMDL emphasizes mercury minimization plans(MMPs)for point source
control. Municipal facilities>2 MGD and discharging quantifiable levels of mercury(>1 ng/1)will
receive an MMP requirement. Industrials are evaluated on a case-by-case basis,depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value(based on the NC WQS of 12 ng/l)and/or if any individual value exceeds a TBEL
value of 47 ng/1
Table 3. Mercury Effluent Data Summary
2015 2016 2017 2018 2019
#of Samples 1 3 9 8 2
Annual Average Conc.ng/L 0.5 0.9 1.3 0.8 _
Maximum Conc.,ng/L 0.50 0.50 2.22 2.45 1.03
TBEL,ng/L 47
WQBEL,ng/L 12.5
Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL, and no individual mercury sample exceeded the TBEL, no mercury
limit is required. Several samples had quantifiable levels of mercury(> 1 ng/L), however, no data exceed
2.45 ng/L. In this case,a mercury minimization plan(MMP)has not been added to the permit.There was
an MMP in the previous permit, which has been removed from this permit.
Other TMDL/Nutrient Management Strategy Considerations
Page 6 of 11

If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit: NA
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: NA
If applicable, describe any special actions (HQW or ORW)this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H.0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e)and 15A NCAC 2B.0226 for this permit renewal: NA
7. Technology-Based Effluent Limitations (TBELs)
Municipals
Are concentration limits in the permit at least as stringent as secondary treatment requirements(30 mg/I
BOD5/TSSfor Monthly Average, and 45 mg/I for BOD5/TSSfor Weekly Average). YES
If NO,provide a justification for alternative limitations(e.g., waste stabilization pond). NA
Are 85%removal requirements for BOD5/TSS included in the permit? YES
If NO,provide a justification (e.g., waste stabilization pond). NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases,existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis(EAA)and any water quality modeling results: NA
9. Antibacksliding Review:
Sections 402(o)(2)and 303(d)(4)of the CWA and federal regulations at 40 CFR 122.44(1)prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
Page 7 of 11

reissued permit to be as stringent as those in the previous permit,with some exceptions where limitations
may be relaxed(e.g.,based on new information,increases in production may warrant less stringent TBEL
limits,or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit(YES/NO):NO
If YES, confirm that antibacksliding provisions are not violated: NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500;2)
NPDES Guidance,Monitoring Frequency for Toxic Substances(7/15/2010 Memo); 3)NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance(10/22/2012 Memo); 4)Best
Professional Judgement(BPJ). Per US EPA(Interim Guidance, 1996),monitoring requirements are not
considered effluent limitations under Section 402(o)of the Clean Water Act,and therefore anti-
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring,refer to Section 4.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was fmalized on December 21,2015. Effective
December 21,2016,NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs)electronically. Effective December 21,2020,NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting,consistent with Federal requirements.
12.Summary of Proposed Permitting Actions:
A. Table. Current Permit Conditions and Proposed Changes 7 5 MG!)
Parameter Current Permit Proposed Change Basis for Condition/Change
MA 7.5 MGD No change 15A NCAC 213 .0505
BOD5 Summer: No change Based on recommendations
MA 5 mg/1 contained in the 2003 Yadkin-Pee
WA 7.5 mg/1 Dee Basinwide Water Quality
Winter: Management Plan
MA 10 mg/1
WA 15 mg/I
NH3-N Summer: No change Based on recommendations
MA 1 mg/1 contained in the 2003 Yadkin-Pee
Page 8 of 11

WA 3 mg/1 Dee Basinwide Water Quality
Winter: Management Plan
MA 2 mg/I
WA 6 mg/1
I SS MA 30 mg/1 No change Based on the requirements of the 40
WA 45 mg/1 CFR 133.102
Fecal coliform MA 200/100m1 No change WQBEL. State WQ standard, 15A
WA 400/100m1 NCAC 2B .0200
DO >6 mg/1 No change Based on recommendations
contained in the 2003 Yadkin-Pee
Dee Basinwide Water Quality
Management Plan
pH 6—9 SU No change WQBEL. State WQ standard, 15A
NCAC 2B .0200
TRC DM 17 ug/1 No change TRC WLA Calculations
Cyanide MA 5.0 ug/1 Remove monitoring Based on Reasonable Potential
DM 22.8 ug/1 and limits Analysis
Total Copper Quarterly monitoring MA 19.5 ug/1 Based on Reasonable Potential
DM 28.3 ug/1 Analysis
Total Lead Quarterly monitoring Remove monitoring Based on Reasonable Potential
Analysis
Total Zinc Quarterly monitoring Remove monitoring Based on Reasonable Potential
Analysis
Mercury MMP Remove MMP Mercury TMDL evaluation.
Minimization Plan
(MMP)
Electronic No requirement Add Electronic In accordance with EPA Electronic
Reporting Reporting Special Reporting Rule 2015.
Condition
MGD—Million gallons per day,MA- Monthly Average,WA—Weekly Average,DM—Daily Max
13. Public Notice Schedule:
Permit to Public Notice: 08/22/2019
Per 15A NCAC 2H .0109& .0111,The Division will receive comments for a period of 30 days following
the publication date of the public notice.Any request for a public hearing shall be submitted to the
Director within the 30-day comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
Page 9 of 11

14. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed(Yes/No):NO
If Yes, list changes and their basis below:NA
The Division received comments on the draft permit from the Permittee on September 10,2019. No other
comments were received for this draft permit. Comments are below followed by The Division's response
and proposed action in the final permit.
Comment 1 -Request to keep Copper monitoring only- Upon review of the analytical data from
October 2014 through July 2019, the RRWWTP received an effluent test result for this parameter of 28
ug/l on September 19, 2017. Being that this is the only test result from the reviewed period greater than
the newly suggested monthly average limit of 19.5 ug/I, the Town of Mooresville would like to request
that Copper remain designated "monitor only"during this permit cycle.
Response—There is no justification to eliminate the data point of 28 ug/l. As part of the dataset,this
number has to be included in the Reasonable Potential Analysis for Copper.On April 6, 2016, EPA
disapproved the Action Level Policy for copper, zinc,and silver,and effluent limits must now be added if
there is positive reasonable potential,regardless of Whole Effluent Toxicity test results. Data analysis
from December 2014 through May 2019(the most recent 4.5-year period) shows that the maximum
predicted Copper concentration is 34.65 ug/1, which is larger than the allowable chronic concentration of
19.57 ug/1. As the positive reasonable potential shows,monthly monitoring with limits will be applied to
the facility.
Comment 2-Questions about upstream and downstream dissolved oxygen and temperature—
• As the Town of Mooresville is a participant in the YPDRBA, upstream and downstream dissolved
oxygen and temperature samples are waived. However, it is stated in the footnotes of the draft
that during the months of June through September, the RRWWTP should collect grab samples
3/week for upstream and downstream dissolved oxygen and temperature. Will the RRWWTP need
to collect the samples described above during this timeframe or may that also be waived due to
the Town of Mooresville's participation in the YPDRBA?
• Should the test results of the upstream and downstream dissolved oxygen and temperature be
submitted in our permit renewal application or will this data need to be entered in the eDMR?
Response—As long as the Town of Mooresville is a participant in the Yadkin-Pee Dee River Basin
Association(YPDRBA),the instream monitoring requirements for dissolved oxygen and temperature are
waived. The Division retains the detailed sampling requirements of instream sampling just for your
reference,in case your membership in the association be terminated. In that case,the permittee shall
conduct upstream and downstream sampling and report the data to the Division.
As a member of YPDRBA, you do not need to submit upstream and downstream dissolved
oxygen and temperature data for permit renewal application or eDMR.
Comment 3-Question about upstream hardness—The YPDRBA will begin sampling of upstream
hardness.If the RRWWTP should receive approval from the DWR-NPDES permitting unit, will that
satisfy the permit condition for upstream hardness sampling?
Page 10 of 11

Response—Yes. If the permittee is a member of a monitoring coalition program, sampling for instream
hardness may be waived as long as the monitoring coalition agrees to sample hardness at the nearest
upstream location,at a minimum frequency of quarterly. If the Coalition has not yet started or terminates
instream hardness sampling at the approved station,the permittee shall conduct sampling for instream
hardness upstream of its discharge,and submit instream hardness test results with its permit renewal
application package.
15. Fact Sheet Attachments (if applicable):
• Monitoring Report Violations Summary
• Whole Effluent Toxicity Testing and Self Monitoring Summary
• WWTP Compliance Inspection Report
• NH3/TRC WLA Calculations
• RPA Sheets
o Input Information
o Data Analysis
o Results Summary
o Dissolved to Total Metal Calculation
• NPDES Implementation of Instream Dissolved Metals Standards—Freshwater Standards
• Mercury TMDL Calculations
• BOD&TSS Removal Rate Calculations
• PERCS Pretreatment Information Request Form
Page 11of11

MONITORING REPORT(MR)VIOLATIONS for: Report Date: 07/25/19 Page: 1 of 3
Permit: J04-s.2L MRs Between - and 3 - 2019 Region: °%o Violation Category: Program Category:
Facility Name: e, Param Name County: °% Subbasin: Violation Action:
Major Minor: ,•n
PERM: NC004672 FACILITY: Town of Mooresville-Rocky River WWTP COUNTY:Iredell RC-EsION: Mooresville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
05-2015 001 Effluent Chlorine,Total Residual 05/27/15 5 X week ugh 18 27 50 Daily Maximum No Action,BPJ
Exceeded
06-2015 001 Effluent Chlorine,Total Residual 06/17/15 5 X week ugh 18 24 33.3 Daily Maximum No Action,BPJ
Exceeded
06_2015 001 Effluent Chlorine,Total Residual 06/30/15 5 X week ugh 18 21 16.7 Daily Maximum No Action,BPJ
Exceeded
08-2015 001 Effluent Chlorine,Total Residual 08/04/15 5 X week ugh 18 22 22.2 Daily Maximum No Action,BPJ
Exceeded
08_2015 001 Effluent Chlorine,Total Residual 08/19/15 5 X week ugh 18 19 5.8 Daily Maximum No Action,BPJ
Exceeded
09-2015 001 Effluent Chlorine,Total Residual 09/01/15 5 X week ugA 18 26 44.4 Daily Maximum No Action,BPJ
Exceeded
09_2015 001 Effluent Chlorine,Total Residual 09/30/15 5 X week ugh 18 23 27.8 Daily Maximum No Action,BPJ
Exceeded
10_2015 001 Effluent Chlorine,Total Residual 10/20/15 5 X week ug/I 18 19 5.6 Daily Maximum No Action,BPJ
Exceeded
12-2015 001 Effluent Chlorine,Total Residual 12/08/15 5 X week ugA 18 33 63.3 Daily Maximum No Action,BPJ
Exceeded
01-2016 001 Effluent Chlorine,Total Residual 01/14/16 5 X week ugA 18 19 5.8 Daily Maximum No Action,BPJ
Exceeded
06-2016 001 Effluent Chlorine,Total Residual 06/22/16 5 X week ug/I 18 19 5.6 Daily Maximum No Action,BPJ
Exceeded
07-2016 001 Effluent Chlorine,Total Residual 07/13/16 5 X week ugA 18 20 11.1 Daily Maximum No Action,BPJ
Exceeded
08-2016 001 Effluent Chlorine,Total Residual 08/16/16 5 X week ugA 18 20 11.1 Daily Maximum No Action,BPJ
Exceeded
11_2016 001 Effluent Chlorine,Total Residual 11/22/16 5 X week ugA 18 28 44.4 Deity Maximum No Action,BPJ
Exceeded
05_2017 001 Effluent Chlorine,Total Residual 05/01/17 5 X week ugA 17 20 17.6 Daily Maximum No Action,BPJ
Exceeded
08_2017 001 Effluent Chlorine.Total Residual 08/16/17 5 X week ugA 17 18 5.9 Daily Maximum No Action,BPJ
Exceeded

MONITORING REPORT(MR)VIOLATIONS for: Report Date: 07/25/19 Page: 2 of 3
Permit: MRs Between - and - Region: Violation Category: Program Category
Facility Name: Param Name County: Subbasin: Violation Action:
Major Minor:
psalm NC0048728 FAC(LJTY: i own of Mooresville-Rocky River WW r. COMM':Iredell REGION: Mooresville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over TYPE VIOLATION ACTION
11-2017 001 Effluent Chlorine.Total Residual 11/28/17 5 X week ugA 17 25 47.1 Daily Maximum No Action,BPJ
Exceeded
01_2018 001 Effluent Chlorine,Total Residual 01/02/18 5 X week ugh 17 34 100 Daily Maximum No Action,BPJ
Exceeded
01_2018 001 Effluent Chlorine,Total Residual 01/09/18 5 X week ugh 17 18 5.9 Daily Maximum No Action,BPJ
Exceeded
01-2018 001 Effluent Chlorine,Total Residual 01/29/18 5 X week ugh 17 20 17.6 Daily Maximum No Action,BPJ
Exceeded
02-2018 001 Effluent Chlorine,Total Residual 02/26/18 S X week ugh 17 23 35.3 Daily Maximum No Action,BPJ
Exceeded
03_2018 001 Effluent Chlorine,Total Residual 03/19/18 5 X week VI 17 30 78.5 Daily Maximum No Action,BPJ
Exceeded
06_2018 001 Effluent Chlorine,Total Residual 06/12/18 5 X week ugh 17 28 64.7 Daily Maximum No Action,BPJ
Exceeded
08_2018 001 Effluent Chlorine,Total Residual 08/09/18 5 X week ugh 17 28 64.7 Daily Maximum No Action,BPJ
Exceeded
08-2018 001 Effluent Chlorine,Total Residual 08/29/18 5 X week ugh 17 32 88.2 Daily Maximum No Action,BPJ
Exceeded
09_2018 001 Effluent Chlorine,Total Residual 09/18/18 5 X week ugh 17 22 29.4 Daily Maximum No Action,BPJ
Exceeded
05_2017 001 Effluent Collform,Fecal MF,MFC 05/31/17 5 X week #/100m1 200 1 i 0 Monthly Geometric Mean Proceed to NOV
Broth,44.5 C Exceeded
05_2018 001 Effluent Cyanide,Total(as Cn) 05/31/18 Monthly ugh 5 8 60 Monthly Average No Action,BPJ
Exceeded
Monitortrto Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE VALUE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
MEASURE07_2018 001 Effluent BOD,5-Day(20 Deg.C)- 07/09/18 5 X week mgl Frequency Violation No Action,Facility
Concentration Reporting Error
07_2018 001 Effluent Coliform,Fecal MF,MFC 07/09/18 5 X week #/100m1 Frequency Violation No Action,Facility
Broth,44.5 C Reporting Error

MONITORING REPORT(MR)VIOLATIONS for: Report Date: 07/25/19 Page: 3 of 3
Permit: VC0046728 MRs Between 6- 2014 and 5- 201 Region: Violation Category: Program Category:
Facility Name:,k, Param Name % County: Subbasin: Violation Action:
Major Minor: ',
pima: NC0048728 FACILITY: Town of Mooresv!le-Rocky River WIMP COUNTY:,r.,.-i, REGION: Mooresville
Monitoring Violation
MONITORING OUTFALL LOCATION PARAMETER VIOLATION FREQUENCY LIMIT CALCULATED VIOLATION TYPE VIOLATION ACTION
REPORT DATE MEASUREUNIT VALUE Over
07-2016 001 Effluent Nitrogen,Ammonia Total(as 07/09/18 5 X week mg/i Frequency Violation No Action,Facility
N)-Concentration Reporting Error
07-2014 001 Effluent Oxygen.Dissolved(DO) 07/19/14 5 X week mg/i Frequency Violation No Action,BPJ
07-2016 001 Effluent Oxygen,Dissolved(DO) 07/09/16 5 X week mg/I Frequency Violation No Action,Facility
Reporting Error
07-2018 001 Effluent pH 07/09/16 5 X week su Frequency Violation No Action,Facility
Reporting Error
07-2016 001 Effluent Solids,Total Suspended- 07/09/16 5 X week mg/I Frequency Violation No Action,Facility
Concentration Reporting Error
07-2018 001 Effluent Temperature,Water Deg. 07/09/16 5 X week deg c Frequency Violation No Action,Facility
Centigrade Reporting Error

Whole Effluent Toxicity Testing and Self Monitoring Summary
Moore County WWTP N00037508/001 County: Moore Region: FRO Basin: LUMS0 Mar Jun Sep Dec SOC_JOC
Ceri7dPF Begin: 12/1/2010 chr lim:41%or50% NonComp: Single 7010: 15.2 PF: 6.7 IWC: 40.54 Freq: Q
J F M A M I I A S 0 N D
2012 - - Pass - - Pass - - Pass - - >100(P)Pass
2013 - - Pass>100(P) - - >100(P)Pass - - >100(P)Pass - Pass
2014 - - Pass - - Pass - - Pass - - Pass
2015 Pass - -
Pass Pass - - Pass
2016 - - Pass - - Pass - - - - -
Mooresville-Rocky River WWTP NC0046728/001 County: Iredell Region: MRO Basin: YAD11 Feb May Aug Nov SOC_JOC:
Ceri7dPF Begin: 4/1/2014 chrlim:<5.5 MGD ID NonComp: Single 7010: 0.5 PF: 5.5 IWC: 94.15 Freq: Q
J F M A M J I A S 0 N D
2012 - Pass - - Pass - - >100(P)Pass >100(P)Pass Pass
2013 - Pass - Pass - - Pass - Pass -
2014 - Pass - - Pass - - Pass - Pass -
2015 - Pass - Pass - - Pass Pass -
2016 - Pass - Pass - - Pass>100(P) - -
Morehead City WWTP N00026611/001 County: Carteret Region: WIRO Basin: WOK03 Feb May Aug Nov SOC_JOC: 1
Mysd24PF Begin: 4/1/2013 24hr p/f ac Ilm:90% + NonComp: Single 7010: TIDAL PF: 1.7 IWC: NA Freq: Q
J F M A M I J A S 0 N D
2012 Pass - Pass - - Pass - - Pass -
2013 - Pass - Pass - . Pass - - Pass -
2014 Pass - Pass - - Pass - - Pass -
2015 - Pass - Pass - - Pass - - Pass -
2016 Pass Pass . - Pass • -
Morganton-Catawba R.PCF NC0026573/001 County: Burke Region: ARO Basin: CT831 Jan Apr Jul Oct SOC_JOC:
Ceri7dPF Begin: 5/1/2016 chr Iirn:9%@ 8MGD; NonComp: Single 7Q10: 126 PF: 13 IWC: 8.96 Freq: Q
J F M A M 1 l A 5 0 N D
2012 Pass - Pass - - Pass - - Pass - -
2013 Pass - - Pass - - Pass - - Pass - -
2014 Pass - - Pass - - Pass - - >36(P)Pass - -
2015 Pass>36(P) - - Pass>36(P) - Pass - Pass - -
2016 Pass Pass - -
Pass - - - -
Motiva Enterprises LLC Charlotte 001 NC0046892/001 County: Mecklenburg Region: MRO Basin: CTB34 Jan Apr Jul Oct SOC_IOC:
Ceri24PF Begin: 9/1/2015 Cerio24PF Urn: 90% NonComp: 7010: 0.0 PF: NA IWC: 100 Freq: Q
J F M A M J 1 A 5 0 N D
2012 - - >100 - - - - - -
•
2013 - - - >100 - - - -
2014 - - >100 - - - - - -
2015 >100 - - - - -
2016 Pass Pass -
Pass -
Legend: P=Fathead minnow(Plmphaies promelas).H=No Flow(facility is active).s=Split test between Certified Labs Page 75 of 125

Whole Effluent Toxicity Testing and Self Monitoring Summary
Montgomery County WTP NC0080322/001 County: Montgomery Region: FRO Basin: YAD08 Jan Apr Jul Oct SOC JOC:
Ceri7dPF Begin: 7/1/2014 Chr Monit: 90% NonComp: 7010: PF: 0.470 IWC: Freq: Q
J F M A M J J A S 0 N D
2015 Fail - - Invalid Fail >100 Pass - Pass - -
2016 Fail - - Pass - - Pass - - Pass - -
2017 Fail - Pass - - Pass - Pass - -
2018 Pass - - Pass - - Pass - Fail - -
2019 Pass - - Pass - - - - - - -
Moore CountyWWTP N00037508/001 County: Moore Region: FRO Basin: LUM50 Mar Jun Sep Dec SOC_JOC:
Ceri7dPF Begin: 12/1/2010 chr lim:41%or 50% NonComp: Single 7Q10: 15.2 PF: 6.7 IWC: 40.54 Freq: Q
J F M A M J J A 5 0 N D
2015 - - Pass - Pass - Pass - - Pass
2016 - Pass - - Pass - - Pass - - Pass
2017 - - Pass - Pass - - Pass - - Pass
2018 Pass - Pass>100(P) - - Pass - Pass
2019 -
Pass - - -
Mooresville-Rocky River WWTP NC0046728/001 County: Iredell Region: MRO Basin: YAD11 Feb May Aug Nov SOC_JOC:
Ceri7dPF Begin: 4/1/2014 chr Ilrn:<5.5 MGD @ NonComp: Single 7Q10: 0.5 PF: 5.5 IWC: 94.15 Freq: Q
I F M A M J 1 A 5 0 N D
2015 - Pass - - Pass - - Pass - - Pass -
2016 - Pass - - Pass - - Pass>100(P) - - Pass>100(P) -
2017 - >100(P)Pass - - >100(P)Pass - - Pass - - Pass -
2018 - Pass - - Pass - - Pass - - Pass -
2019 Pass - - - -
Morehead City WWTP NC0026611/001 County: Carteret Region: WIRO Basin: WOK03 Feb May Aug Nov SOC MC:
Mysd24PF Begin: 4/1/2013 24hr p/f ac lim:90% + NonComp: Single 7Q10: TIDAL PF: 1.7 IWC: NA Freq: Q
J F M A M J J A 5 0 N D
2015 - Pass - - Pass - - Pass - - Pass -
2016 - Pass - - Pass - Pass - - Pass
2017 - Pass - - Pass - Pass - - Pass -
2018 - Pass - - Pass - - Pass - - >100(P)>100 >100(P)
2019 >100(P) Pass>100(P) - - - - - - - - -
Morganton-Catawba R.PCF N00026573/001 County: Burke Region: ARO Basin: CTB31 Jan Apr Jul Oct SOC_JOC:
Ceri7dPF Begin: 5/1/2016 chr lim:9%@ 8MGD; NonComp: Single 7Q10: 126 PF: 13 IWC: 8.96 Freq: Q
J F M A M J J A S 0 N D
2015 Pass>36(P) - - Pass>36(P) - Pass - - Pass - -
2016 Pass - Pass - Pass - - Pass - -
2017 Pass - - Pass - - Pass - - Pass - -
2018 Pass - - Pass - - Pass - Pass -
2019 Pass Pass -
Legend: P=Fathead minnow(Pimohales promelas).H=No Flow(facility Is active).s=Split test between Certified Labs Page 76 of 125

1 ;ROY COOPER
j.
tdo lcnor
MICHAEL S.REGAN
* Secretary
•Water Resources LINDA CULPEPPER
Environmental Quality Interim Director
November 15,2017
Ms.Allison Kraft,Interim Utilities Director
Town of Mooresville
P.O.Box 878
Mooresville,North Carolina 28115
Subject: Compliance Evaluation Inspection
Town of Mooresville/Rocky River WWTP
NPDES Permit No.NC0046728
Iredell County
Dear Ms.Kraft:
Enclosed is a copy of the Compliance Evaluation Inspection Report for the inspection conducted
at the subject facility on November 9,2017,by Mr.Wes Bell of this Office. Please inform the facility's
Operator-in-Responsible Charge(ORC)of our findings by forwarding a copy of the enclosed report.
Should you have any questions concerning this report,please do not hesitate to contact Mr.Bell
at(704)235-2192,or via email at wes.belHnedenr.gov.
Sincerely,
W.Corey Basinger,Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources,NCDEQ
Enclosure:
Inspection Report ff�
cc: Iredell County Health Department
MSC-1617 Central-Basement
WB
•
State of North Carolina!Environmental Quality'Water Resources I Water Quality Regional Operations
Mooresville Regional Office 1 610 East Center Avenue,Suite 310 1 Mooresville,North Carolina 28115
704-663.1699

United States Environmental Protection Agency Form Approved.
EPA Washington,D.C.20460 OMB No.2040-0057
Water Compliance Inspection Report Approval expires 8-31-98
Section A:National Data System Coding(i.e.,PCS)
Transaction Code NPDES yr/mo,/day Inspection Type Inspector Fac Type
1 hN ( 2 3 I NC0046728 111 12 1 17/11/09 117 18 Lip. 19[ I 201 I
21111111 1I111111I111111111 1111111 111111I 1111 r6
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA Reserved------ ---- —
6712.0 1 701�u I 71 Li 72 I „ I 7311 174 75J 1 1 I 1 1 1 180
Section B:Facility Data
Name and Location of Facility Inspected(For Industrial Users discharging to POTW,also include Entry Time/Date Permit Effective Date
POTW name and NPDES permit Number) 09:10AM 17/11/09 14/04/01
Rocky River WWTP
Exit Time/Date Permit Expiration Date
369 Johnson Dairy Rd
02:30PM 17/11109 18/11/30
Mooresville NC 28115
Name(s)of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data
///
James Andrew Levis/ORC/704-662-8341/
Name,Address of Responsible OfficiaUTitle/Phone and Fax Number
Contacted
Allison Kraft,PO Box 878 Mooresville NC 28115/Interim Utilities
No
D i rector/704-799-4066/
Section C:Areas Evaluated During Inspection(Check only those areas evaluated)
1. Permit II Flow Measurement Operations&Maintenance I Records/Reports
III Self-Monitoring Program III Sludge Handling Disposal III Facility Site Review NI Effluent/Receiving Waters
Laboratory
Section D:Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Namo(s)and Slgnature(s)of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Wes Bell MRO WQ/f704-663-1699 Ext 2192/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
W.Corey Basinger MRO WQ//704-235-2194/
EPA Form 3560-3(Rev 9-94)Previous editions are obsolete.
Page# 1

NPDES yr/moiday Inspection Type 1
31 NC0046728 111 121 17/11/09 l 17 18 _,
Section D:Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
On-site Representatives:
The following Town personnel were in attendance during the inspection: Mr.Jamie Levis/WWTP
Manager; Mr.Jeff Campbell/Environmental Compliance Supervisor; and Mr. Tom Wynn/Operation &
Maintenance Supervisor.
Page# 2

River WWTP
11
Owner-Facility: Rocky
Permit: NC0046728
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new 0 ❑ • ❑
application?
Is the facility as described in the permit? 0 NI ❑ ❑
#Are there any special conditions for the permit? • ❑ 0 0
Is access to the plant site restricted to the general public? • 0 0 0
Is the inspector granted access to all areas for inspection? • El 0 0
Comment: The Permit's facility description will need to be updated during the next permit renewal
process to include all changes from the 5.2 MGD to 7.5 MGD upgrades.
The Town of Mooresville implements an approved Industrial Pretreatment Program.
The last compliance evaluation inspection was performed at the facility on 3/9/16 by DWR
staff.
Record Keeping Yes No NA NE
Are records kept and maintained as required by the permit? • ❑ ❑ ❑
Is all required information readily available,complete and current? • 0 0 0
Are all records maintained for 3 years(lab. reg. required 5 years)? • 0 0 ❑
Are analytical results consistent with data reported on DMRs? I 0 0 ❑
Is the chain-of-custody complete? III 0 0 ❑
Dates,times and location of sampling •
Name of individual performing the sampling •
Results of analysis and calibration •
Dates of analysis •
Name of person performing analyses •
Transported COCs •
Are DMRs complete:do they include all permit parameters? • ❑ ❑ 0
Has the facility submitted its annual compliance report to users and DWQ? • 0 0 0
(If the facility is=or>5 MGD permitted flow)Do they operate 24/7 with a certified operator • 0 0 0
on each shift?
Is the ORC visitation log available and current? • ❑ ❑ 0
Is the ORC certified at grade equal to or higher than the facility classification? • 0 0 ❑
Is the backup operator certified at one grade less or greater than the facility classification? III 0 ❑ 0
Is a copy of the current NPDES permit available on site? • 0 El 0
Facility has copy of previous year's Annual Report on file for review? ❑ ❑ 0 II
Page# 3

Permit: NC0046728 Owner-Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Comment: The records reviewed during the inspection were organized and well maintained. Discharge
Monitoring Reports(DMRs)were reviewed for the period September 2016 through August
2017. A monthly average effluent fecal coliform violation was reported in May 2017. The
Division has previously addressed these limit violations through the issuance of a Notice of
Violation (NOV).
The Division's database(BIMS)has been updated to reflect the 7.5 MGD phased flow limit
and the associated effluent limitations and monitoring requirements.
The facility staff must ensure that the effluent chronic toxicity result is put under the correct
parameter code and BOD and TSS percent removal results are properly converted on the
eDMR.
Laboratory Yes No NA NE
Are field parameters performed by certified personnel or laboratory? I 0 0 0
Are all other parameters(excluding field parameters)performed by a certified lab? • 0 0 0
#Is the facility using a contract lab? • 0 0 0
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees • 0 0 ❑
Celsius)?
Incubator(Fecal Coliform)set to 44.5 degrees Celsius+/-0.2 degrees? ❑ 0 0 •
Incubator(BOD)set to 20.0 degrees Celsius+/-1.0 degrees? 0 0 0 III
Comment: Influent and effluent analyses (including field)are performed under the Town's Laboratory
Certification#173. Pace Analytical Services, Inc. Prism Labs Inc., and ETT. Inc. have also
been contracted to provide analytical support.
Influent Sampling Yes No NA NE
#Is composite sampling flow proportional? • 0 0 ❑
Is sample collected above side streams? • 0 ❑ 0
Is proper volume collected? IN ❑ ❑ ❑
Is the tubing clean? • 0 ❑ 0
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees • 0 ❑ ❑
Celsius)?
Is sampling performed according to the permit? • ❑ 0 0
Comment: The subject permit requires BOD and TSS composite samples. The internal sampler
temperature was two degrees Celsius and collecting approximately 140 ml.aliquots at the
time of the inspection.The facility staff perform and document daily aliquot verifications on
the sampler.
Effluent Sam_plinq Yes No NA NE
Is composite sampling flow proportional? • 0 0 0
Is sample collected below all treatment units? • 0 0 0
Page# 4

Permit: NC0046728 Owner-Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Effluent Sampling Yes No NA NE
Is proper volume collected? • ❑ 0 0
Is the tubing clean? • ❑ ❑ ❑
#is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees • 0 ❑ ❑
Celsius)?
Is the facility sampling performed as required by the permit(frequency,sampling type • 0 0 ❑
representative)?
Comment: The subject permit requires composite and grab effluent samples. The sampler
temperature was three degrees Celsius and collecting 180 ml.aliquots at the time of the
inspection. The facility staff perform and document daily aliquot verifications on the sampler.
Upstream!Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit(frequency,sampling type,and 0 ❑ II 0
sampling location)?
Comment: The Division has conditionally waived the instream monitoring requirements due to the
Town's participation in the Yadkin-Pee Dee River Basin Association.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? • ❑ ❑ 0
Does the facility analyze process control parameters,for ex: MLSS, MCRT,Settleable • 0 0 ❑
Solids, pH, DO, Sludge Judge,and other that are applicable?
Comment: The wastewater treatment facility appeared to be properly operated and well maintained. _
The ORC and staff incorporate a comprehensive process control program with all
measurements being properly documented and maintained on-site. The facility is equipped
with a SCADA system to assist the wastewater staff in the operation of all treatment
processes/units.
Both package plant treatment trains(aeration and clarification per train"_have been in service
since January 2017.
Equalization Basins Yes No NA NE
Is the basin aerated? U ❑ 0 0
Is the basin free of bypass lines or structures to the natural environment? • ❑ 0 0
Is the basin free of excessive grease? 0 ❑ ❑ U
Are all pumps present? • ❑ 0 ❑
Are all pumps operable? • ❑ 0 ❑
Are float controls operable? • 0 0 0
Are audible and visual alarms operable? ❑ ❑ ■ ❑
#Is basin size/volume adequate? I ❑ 0 ❑
Page# 5

Permit: NC0046728 Owner-Facility: Rocky River WVTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Equalization Basins Yes No NA NE
Comment: Both wet weather equalization tanks (1 MG each)for the Rocky River Sewer Pump Station
were operational.
Pump Station -Influent Yes No NA NE
Is the pump wet well free of bypass lines or structures? • CI ❑ ❑
Is the wet well free of excessive grease? II ❑ ID ❑
Are all pumps present? II El GI
Are all pumps operable?
Are float controls operable? • CI El CI
Is SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Comment: The screw pumps (traditional plant)and submersible pumps(package plants)were
operational and in service.
Bar Screens Yes No NA NE
Type of bar screen
a.Manual
b.Mechanical
Are the bars adequately screening debris? • El El
Is the screen free of excessive debris? III El El CI
Is disposal of screening in compliance?
Is the unit in good condition? • El DO
Comment: Screenings are disposed by a contracted company(Benfield Sanitation)at a permitted
landfill.
The traditional plant and package plants are equipped with separate mechanical screening
ystems (both operational and in service).
Chemical Feed Yes No NA NE
Is containment adequate? • ❑ El El
Is storage adequate?
Are backup pumps available?
Is the site free of excessive leaking? • ID DO
Comment: Sodium hydroxide is added to the influent lorior to aeration basinslto maintain appropriate_
alkalinity/pH levels.
Aeration Basins Yes No NA NE
Page# 6

Permit: NC0046728 Owner-Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Aeration Basins Yes No NA NE
Mode of operation Ext.Air
Type of aeration system Surface
Is the basin free of dead spots? • 0 ❑ ❑
Are surface aerators and mixers operational? • ❑ ❑ ❑
Are the diffusers operational? • ❑ ❑ ❑
Is the foam the proper color for the treatment process? • 0 ❑ ❑
Does the foam cover less than 25%of the basin's surface? • 0 ❑ 0
Is the DO level acceptable? • ❑ 0 ❑
Is the DO level acceptable?(1.0 to 3.0 mg/I) ill ❑ ❑ ❑
Comment: The aeration basins in both the tradition plant(surface aeration)and package plant(diffused
aeration)were operational and in service.
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater? II 0 0 0
Is the site free of excessive buildup of solids in center well of circular clarifier? 1110 ❑ ❑
Are weirs level? • 0 ❑ ❑
Is the site free of weir blockage? • ❑ 0 0
Is the site free of evidence of short-circuiting? • ❑ ❑ El
Is scum removal adequate? II 0 ❑ ❑
Is the site free of excessive floating sludge? II 0 ❑ ❑
Is the drive unit operational? • 0 ❑ ❑
Is the return rate acceptable(low turbulence)? • ❑ ❑ ❑
Is the overflow clear of excessive solids/pin floc? • ❑ 0 ❑
Is the sludge blanket level acceptable?(Approximately Y.of the sidewall depth) III 0 El ❑
Comment:
Pumps-RAS-WAS Yes No NA NE
Are pumps in place? • 0 0 ❑
Are pumps operational? • ❑ ❑ ❑
Are there adequate spare parts and supplies on site? ❑ ❑ ❑
11
Comment:
Filtration (High Rate Tertiaryl Yes No NA NE
Type of operation: Cross flow
Page# 7

Permit: WC0046728 Owner-Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Filtration (High Rate Tertiary) Yes No NA NE
Is the filter media present? • ❑ 0 0
Is the filter surface free of clogging? • ❑ 0 0
Is the filter free of growth? . 0 0 ❑
Is the air scour operational? ❑ 0 • 0
Is the scouring acceptable? • ❑ ❑ 0
Is the clear well free of excessive solids and filter media? • 0 0 ❑
Comment: All four disc filter trains were operational; however,two trains are typically in service.
Flow Measurement-Effluent Yes No NA NE
#Is flow meter used for reporting? a ❑ ❑ 0
Is flow meter calibrated annually? • 0 0 0
Is the flow meter operational? • ❑ ❑
(If units are separated)Does the chart recorder match the flow meter? 0 0 • 0
Comment: The flow meters (influent and effluent)are calibrated quarterly and were last calibrated on
10/19/17 by CTS, Inc.
Disinfection -UV Yes No NA NE
Are extra UV bulbs available on site?
Are UV bulbs clean? III 0 0 0
Is UV intensity adequate? • 0 0 0
Is transmittance at or above designed level?
Is there a backup system on site? • 0 ❑ ❑
Is effluent clear and free of solids? IN ❑ 0 ❑
Comment:
Effluent Pipe Yes No NA NE
Is right of way to the outfall properly maintained? • 0 ❑ ❑
Are the receiving water free of foam other than trace amounts and other debris? • 0 ❑ 0
If effluent (diffuser pipes are required) are they operating properly? 0 ❑ 11 0
Comment: The effluent appeared clear with no floatable solids or foam. The receiving stream did not
appear to be negatively impacted.
Aerobic Digester Yes No NA NE
Is the capacity adequate? • 0 0 0
Page# 8

Permit: NC0046728 Owner-Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Aerobic Digester Yes No NA NE
Is the mixing adequate? • 0 0 0
Is the site free of excessive foaming in the tank? • 0 0 ❑
#Is the odor acceptable? • ❑ 0 0
#Is tankage available for properly waste sludge? 0 0 ❑
Comment: Both aerobic digesters were operational and in service.
Solids Handling Equipment Yes No NA NE
Is the equipment operational? • 0 0 0
Is the chemical feed equipment operational? III 0 0 0
Is storage adequate? • ❑ 0 ❑
Is the site free of high level of solids in filtrate from filter presses or vacuum filters? ❑ 0 ❑
Is the site free of sludge buildup on belts and/or rollers of filter press? • 0 0 0
Is the site free of excessive moisture in belt filter press sludge cake? IIDOD
The facility has an approved sludge management plan? • 0 ❑ 0
Comment: The belt press and dryer system were operational and in service. The facility produces a
Class A residual that is currently being distributed to the Rowan Research Farm (Rowan
County)and a private farm (Iredell County)under the authority of Permit No.WQ0036723.
The facility is also permitted for the land application of bio-solids (Class B residuals)under
the authority of Permit No.WQ0014136.
Standby Power Yes No NA NE
Is automatically activated standby power available? 11 ❑ ❑ ❑
Is the generator tested by interrupting primary power source? U ❑ ❑ ❑
Is the generator tested under load? I ❑ ❑ ❑
Was generator tested&operational during the inspection? U ❑ ❑ ❑
Do the generator(s)have adequate capacity to operate the entire wastewater site? U ❑ ❑ ❑
Is there an emergency agreement with a fuel vendor for extended run on back-up power? 111 0 0 0
Is the generator fuel level monitored? ■ ❑ ❑ ❑
Comment: The facility is equipped with four standby generators(3—WWTP and 1 —wet weather EQ
tanks)that are periodically tested and serviced (Cummings). The facility also participates in
the load management program.
Page# 9

NH3/TRC WLA Calculations
Facility: Rocky River WWTP
PermitNo. NC0046728
Prepared By: Min Xiao
Enter Design Flow(MGD): 7.5
Enter s7Q10(cfs): 0.5
Enter w7Q10 (cfs): 0.9
Total Residual Chlorine(TRC) Ammonia(Summer)
Daily Maximum Limit(ugh!) Monthly Average Limit(mg NH3-N/I)
s7Q10(CFS) 0.5 s7Q10 (CFS) 0.5
DESIGN FLOW(MGD) 7.5 DESIGN FLOW(MGD) 7.5
DESIGN FLOW(CFS) 11.625 DESIGN FLOW(CFS) 11.625
STREAM STD(UG/L) 17.0 STREAM STD(MG/L) 1.0
Upstream Bkgd (ug/I) 0 Upstream Bkgd (mg/I) 0.22
IWC(%) 95.88 IWC(%) 95.88
Allowable Conc.(ug/l) 18 Allowable Conc. (mg/I) 1.0
Ammonia (Winter)
Monthly Average Limit(mg NH3-N/I)
Fecal Coliform w7Q10 (CFS) 0.9
Monthly Average Limit: 200/100m1 DESIGN FLOW(MGD) 7.5
(If DF >331; Monitor) DESIGN FLOW(CFS) 11.625
(If DF<331; Limit) STREAM STD (MG/L) 1.8
Dilution Factor DF
( ) 1.04 Upstream Bkgd (mg/I) 0.22
IWC(%) 92.81
Allowable Conc. (mg/I) 1.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc>35 mg/I, Monitor Only
2. Monthly Avg limit x 3=Weekly Avg limit(Municipals)
3. Monthly Avg limit x 5= Daily Max limit(Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2=400/100 ml =Weekly Avg limit(Municipals) = Daily Max limit(Non-Muni)

Freshwater RPA- 95% Probability/95%Confidence Using Metal Translators
MAXIMUM DATA POINTS=58
+- REQUIRED DATA ENTRY
Table 1. Project Information Table 2. Parameters of Concern
CHECK IF HQW OR ORW WQS I Name WQs Type Chronic Modifier Acute PQL Units
Facility Name Rocky River WWTP Par01 I Arsenic I AquedicLife C 150 FW 340 I ug/L
WWTPIWTP Class Grade IV Par02 Arsenic Human Health C 10 HH/WS N/A ug/L
water Supply
NPDES Permit NC0046728 Par03 Beryllium Aquatic Life NC 6.5 FW 65 ug/L
Outfall 001 Par04 Cadmium Aquatic Life NC 1.2702 FW 7.8784 j ugh
Flow,Qw(MGD) 7,500 Par05 Chlorides Aquatic Life NC 230 FW Ing i.
Receiving Stream Dye Creek(Branch) Par96y Chlorinated Phenolic Compounds water Supply NC 1 A ug/L
•
HUC Number 030401050102 Par07 1+ Total Phenolic Compounds Aquatic Life NC 300 A ug/L
Stream Class C Paroa Chromium III Aquatic Life NC 270.3790 FW 2084.4743 ug/L❑Apply ws Hardness WQC Per09 Chromium VI Aquatic Life NC 11 FW 16 pg/L
7Q10s(cfs) 0.50 Per10 Chromium,Total Aquatic Life NC N/A FW N/A yg/L
7Q10w(cfs) 0.90 -- Part') Copper Aquatic Life NC 18 7624 FW 27.3426 i ug/L
3002(cfs) 1.10 Par12 Cyanide Aquatic Lire NC 5 I FW 22 10 ug/L
QA(cfs) 5.00 '.'Par13 Fluoride Aquatic Life NC I,800 FW ug/L
1Q10s(cfs) 0.42 Par14 Lead Aquatic Life NC 9.1153 FW 234.8070 ugh
Effluent Hardness 70.55 mg/L(Avg) Par15 Mercury Aquatic UM NC 12 I L1v 0.5 r:rtt;.
'Upstream Hardness r 32.94 mg/L(Avg) Par16 Molybdenum Human Health NC 2000 HH *I
Combined Hardness Chronic ! 68.99 mg/L Par17 Nickel Aquatic Life NC^ 87.8797 FW 793.5390 pg/L
Combined Hardness Acute 69.23 mg/L Pant i Nickel Water Supply NC 25.0000 WS N/A Ng/L
Data Source(s) Pan9 Selenium Aguol'c Life NC 5 FW 56 ug/L
QC HECK TO APPLY MODEL Par20 Silver Aquatic Life NC 0.06 FW 1.7091 ug/L
Pam Zinc Aquatic Life NC 299 5329 FW 297.9780 ug/L
Par22
l
Par23
_. _ - Par24 ' .
9595 Final FW RPA w_upstream avg data column_diss to totalmetals_nodetects_limiteddefaults full pred_2017_1121,input
8/12/2019

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REASONABLE POTENTIAL ANALYSIS
Par03 Pare4 Pub 0 Pall
Beryllium Cadmium Chromium,Total
Data Data BOL=1/2DL Results Date Data BOLa'12DL Results Date Data BDL=1120L ResuMa - Data Da
1 12/14/2015 < 2 , Std DON' 0. 1 1/6/2015 < 1 0.5 St!Dev. 0. 1 1/6/2015 < 5 2.5 Std Dev. 1.3218 1 1/6/2015
4/112016 < 2 1 Mean '0000 2 1/102017 < 1 0.5 Mean 0.5000 2 1/10/2017 < 5 2.5 Mean 27818 2 4/7/2015
3 7/182017 < 2 1 C V de14u71 0 6000 3 4/4/2017 < 1 0.5 C.V. 0.0000 3 4/4/2017 < 5 2.5 C.V. 0.4752 3 7/7/2015
4 n 3 4 7/11/2017 a 1 0.5 n 22 4 7/11/2017 < 5 2.5 n 22 4 10/62015
5 5 8/8/2017 < 1 0.5 5 8/82017 < 5 2.5 5 1/12/2016
6 Mult Fedor= 3.00 6 9/192017 a 1 0.5 Mutt Factor= 1.00 6 9/192017 < 5 2.5 Mutt Factor= 126 6 4/42016
7 Max.Value 1.00 ug/L 7 10/17/2017 a 1 0.5 Max.Value 0.500 ug/L 7 10/172017 < 5 2.5 Max.Value 8.7 pg/L 7 7/11/2016
8 Max.Prod Cw 3.00 ug/L 8 11/14/2017 a 1 0.5 Max.Pred Cw 0.500 ug/L 8 11/142017 < 5 2.5 Max.Pred Cw 11.0 pg/L 8 1/10/2017 a
9 9 12/52017 < 1 0.5 9 12/5/2017 a 5 2.5 9 4/42017
10 10 1/9/2018 < 1 0.5 10 1/9/2018 < 5 2.5 10 7/11/2017
t1 11 2/132018 < 1 0.5 11 2/13/2018 < 5 2.5 11 8/8/2017
12 12 3/6/2018 < 1 0.5 12 3/6/2018 < 5 2.5 12 9/192017
13 13 4/102018 < 1 0.5 13 4/10/2018 < 5 2.5 13 10/17/2017
14 14 5/8/2018 < 1 0.5 14 5/8/2018 < 5 2.5 14 11/142017
15 15 6/5/2018 < 1 0.5 15 6/5/2018 < 5 2.5 15 12/5/2017
16 16 7/10/2018 < 1 0.5 16 7/10/2018 < 5 2.5 16 1/9/2018
17 17 10/16/2018 < 1 0.5 17 10/162018 < 5 2.5 17 2/132018
18 18 1/8/2019 < 1 0.5 18 1/82019 < 5 2.5 18 3/6/2018
19 19 4/9/2019 < 1 0.5 19 4/92019 < 5 2.5 19 4/102018
20 20 12/142015 < 1 0.5 20 12/14/2015 8.7 8.7 20 5/8/2018
21 21 4/11/2016 a 1 0.5 21 4/11/2016 < 5 2.5 21 6/5/2018
22 22 7/182017 < 1 0.5 22 7/182017 < 5 2.5 22 7/10/2018
23 23 23 23 10/18/2018
24 24 24 24 1/8/2019 <
25 25 25 25 4/9/2019 <
26 26 26 26 12/14/2015
27 27 27 27 4/11/2016 <
28 28 28 28 7/18/2017
29 29 29 29
30 30 30 30
31 31 31 31
32 32 32 32
33 33 33 33
34 34 34 34
35 35 35 35
36 36 38 38
37 37 37 37
38 38 38 38
39 39 39 39
40 40 40 40
41 41 41 41
42 42 42 42
43 43 43 43
44 44 44 44
45 45 45 45
46 46 48 46
47 47 47 47
48 48 48 48
49 49 49 49
50 50 50 60
51 51 51 51
52 52 52 52
53 53 53 53
54 54 54 54
55 55 55 55
56 56 56 56
57 57 57 57
58 58 58 58
9595 Final FW RPA w_upstream avg data column_dlss to totalmetals_nodelects_limiteddefaults_full prod_2017_1121,data
2- 8/12/2019

REASONABLE POTENTIAL ANALYSIS
Par12 Pa 14 Pr16
Copper Cyanide Lead Molybdenum
is BDL=120L Results Data Date 6DLeli2DL Results Date BDt.=12DL Results Date Data BDL.I2DL
9 9 Std Dev. 4.7678 1 12/92014 < 5 Std Da/ 0...'e r 1 1/6/2015 < 5 2.5 Sid Dev. 1 1/102017 14 14
8 8 Mean 82821 2 1/62015 < 5 Mean 5.00 2 4172015 a 5 2.5 Mean 2.5000 2 4/4/2017 < 5 2.5
10 10 C.V. 0.5757 3 2/10/2015 < 5 C v 0.0000 3 722015 < 5 2.5 C.V. 0.0000 3 7/112017 5.8 5.8
8 8 n 28 4 3/102015 < 5 n 48 4 10/82015 < 5 2.5 n 27 4 8/8/2017 6.2 6.2
6 6 5 4/7/2015 < 5 5 1/122916 < 5 2.5 5 9/19/2017 6.6 6.6
5.4 5.4 Mutt Factor= 122 6 5/8/2015 < 5 Mao Factor= 1 00 8 4/42016 < 5 2.5 Mult Factor= 1.00 6 10/172017 < 5 2.5
11 11 Max.Value 28.40 ug4. 7 6/9/2015 < 5 Max Vatue 5 0 ua't 7 1/102017 < 5 2.5 Max.Value 2.500 ugl. 7 11/14/2017 6.1 6.1
5 2.5 Max.Prod Cw 34.65 ug4 8 7/72015 < 5 Max Ped Cw 5 0 ug:L 6 4/4/2017 < 5 2.5 Max.Pred Cw 2.500 ug/L 8 12/52017 10.7 10.7
9.9 9.9 9 8/112015 < 5 9 7/112017 < 5 2.5 9 152018 8.1 8.1
10.5 10.5 10 9/8/2015 < 5 10 8/8/2017 < 5 2.5 10 2/13/2018 8.4 8.4
9 9 11 10/6/2015 < 5 11 9/19/2017 < 5 2.5 11 3/62018 10.6 10.6
28.4 28.4 12 11/32015 < 5 12 10/172017 < 5 2.5 12 4/102018 23.2 23.2
10.9 10.9 13 12/8/2015 < 5 13 11/14/2017 < 5 2.5 13 5/82018 18.6 18.6
7.9 7.9 14 1/122016 < 5 14 12/5/2017 a 5 2.5 14 6/5/2018 11.2 11.2
6.6 6.6 15 2/9/2016 < 5 15 1/9/2018 < 5 2.5 15 7/10/2018 14.8 14.8
7.8 7.8 16 322016 < 5 16 2/13/2018 < 5 2.5 16 10/16/2018 248 248
5.5 5.5 17 4/42016 < 5 17 3/6/2018 < 5 2.5 17 1/8/2919 5 5
5.1 5.1 18 5/172016 a 5 18 4/1012018 < 5 2.5 18 4/9/2019 48.4 48.4
8.2 8.2 19 8/7/2016 < 5 19 5/82018 < 5 2.5 19
7.3 7.3 20 1/10/2017 < 5 20 5/52018 < 5 2.5 20
6.8 6.8 21 2/142017 < 5 21 7/10/2018 < 5 2.5 21
10 10 22 3/142017 < 5 22 10/16/2015 < 5 2.5 22
5.1 5.1 23 4/4/2017 < 5 23 1/6/2019 < 5 2.5 23
5 2.5 24 5/112017 < 5 24 4/9/2019 < 5 2.5 24
5 2.5 25 6/6/2017 < 5 26 12/142015 < 5 2.5 25
11 11 26 7/112017 < S 26 4/11/2016 < 5 2.5 26
10 5 27 8/8/2017 < 5 27 7/182017 < 5 2.5 27
12 12 28 9/192017 < 5 28 28
29 10/17/2017 < 5 29 29
30 11/14/2017 < 5 30 30
31 12/52017 a 5 31 31
32 1/9/2018 < 5 32 32
33 2/132018 < 5 33 '33
34 3/6/2018 < 5 34 34
35 4/102016 < 5 35 35
36 518/2018 5 36 36
37 8/52018 < 5 37 37
38 7/102016 < 5 38 38
39 8/7/2018 < 5 39 39
40 9/11/2018 < 5 40 40
41 10/16/2018 < 5 41 41
42 11/82018 < 5 42 42
43 12/42018 < 5 43 43
44 1/8/2019 a 5 44 44
45 2/122019 < 5 45 45
48 3/122019 < 5 48 46
47 4/9/2019 a 5 47 47
48 5/142019 < 5 48 48
49 49 49
50 50 50
51 51 51
52 52 52
53 53 53
54 54 54
55 55 55
56 58 56
57 57 57
58 58 58
9595 Final FW RPA w_upstreem avg data column_d¢s to totalmetas_nodetects_lirnIteddefautts_full cored_2017_1121,data
-3- 8/122019

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REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date Data 6DL=1/2DL Results
1 1/6/2015 64 64 Sid Dev. 14.1258
2.5000 2 4/7/2015 85 85 Mean 56.7154
0.0000 3 7/7/2015 51 51 C.V. 0.2491
22 4 10/6/2015 38 38 n 26
5 1/122016 50 50
1.00 6 4/4/016 49.6 49.6 MuIt Factor= 1.11
2.500 WI 7 7/11/2016 642 64.2 Max.Value 100.0 ug/L
2.500 u01L 8 10/4/2016 46.2 462 Max.Pred Cw 111.0 ug/L
9 1/102017 60.5 60.5
10 4/4/2017 76.9 76.9
11 7/112017 50.7 50.7
12 8/8/2017 53.1 53.1
13 9/192017 53.6 53.8
14 10/17/2017 42.4 42.4
15 11/14/2017 58 58
16 12/52017 49.2 492
17 1/9/2018 100 100
18 2/132018 56.4 58.4
19 3/62018 55.9 55.9
20 4/102018 62.9 62.9
21 5/8/2018 72.1 72.1
22 6/5/2018 54.8 54.8
23 7/102018 46 46
24 10/162018 39.2 392
25 1/8/2019 472 472
26 4/9/2019 472 47.7
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
48
47
48
49
50
51
52
53
54
55
56
57
58
9595 Final FW RPA w_upstneam avg date column_dlaa to totelmetala_nodeteUs limiteddefautts_full preo_2017 1121,data
5" 8/122019

Rocky River WWTP r Outfall 001
NC0046728 Freshwater RPA- 95%Probability/95%Confidence Using Metal Translators Qw = 7.5 MGD
MAXIMUM DATA POINTS = 58
Qw(MGD)= 7.50 WWTP/WTP Class: Grade IV COMBINED HARDNESS(mg/L)
1Q10S(cfs)= 0.42 IWC% @ 1QiOS = 96.51307597 Acute=69.23 mg/L
7Q10S(cfs)= 0.50 IWC% @ 7QIOS= 95.87628866 Chronic=68.99 mg/I,
7Q IOW(cfs)- 0.90 IWC%@7Q IOW= 92.81437126
30Q2(cfs)= 1.10 IWC%@ 30Q2= 91.35559921
Avg.Stream Flow,QA(cfs)= 5.00 IW%C @ QA- 69.92481203
Receiving Stream: Dye Creek(Branch)HUC 030401050102 Stream Class:C
PARAMETER NC STANDARDS OR EPA CRITERIA to REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION
TYPE t
Chronic Applied Acute m n #Del Max Pred Cw Allowable Cw
ard
Acute(FW): 352.3
Arsenic C 150 FW(7Q10s) 340 ug/L _ ___-1-5-6-.3"
_ _ __-__ _ _ _ -_-__
22 0 5.0 Chronic(FW) 156.5 No detects,all values less than 10 ug/L.No
_Max_MDL -10.- -monitoring required - -.---._.---
Arsenic C 10 HH/WS(Qavg) ug/L NO DETECTS Chronic(HH): 14.3
m, 10
Acute: 67.35
Beryllium NC 6.5 FW(7Q10s) 65 ug/L 3 0 3.00 ___ _ _-_-__ _ ___ _ _ _ _ _ _ _ ___ _
Norm n<_9 C.V.(default) Chronic: 6.78 No detects,all values less than 2 ug/L.No monitoring
_ NO DETECTS Max MDL- required.
Acute: 8.163
Cadmium NC 1.2702 FW(7Q10s) 7.8784 ug/L 22 0 0.500 _- _-____ _ _ _ _ __ _
Chronic: 1.325 No detects,all values less than 1 ug/L.No monitoring
NO DETECTS \tax MD! , required
Acute: 2,159.8
Chromium III NC 270.3790 FW(7Q10s) 2084.4743 µg/L 0 0 N/A ___ _ _____ _ _ _ __-___-_-_-_-___-.-_-_-_
Chronic: 282.0
Acute: 16,6
Chromium VI NC 11 FW(7Q10s) 16 µg/L 0 0 N/A ___-__
Chronic: 11 5
Chromium,Total NC µg/L 22 1 11.0 Max reported value=8.7 a:No monitoring required If all Total Chromium
samples are<5 ug/L or Pred.max for Total Cr Is<
allowable Cw for Cr VI.
Acute: 28.33
Copper NC 18.7624 FW(7Q10s) 27.3426 ug/L 28 24 34.65 __ -__ _ .______-_-_________-__ -___-_
Chronic: 19.57 Rp shown-apply Monthly Monitoring with Limit
1 valueisi ' \\IlnwahkCu,
Acute: 22.8
Cyanide NC 5 FW(7Q10s) 22 10 ug/L 48 1 5.0 - _ _ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 5.2 No RP,Just 1 out of 48 data points showed equal to
8.No monitoring required(Cyanide is monitored via
No vain ,ule Cw LTMP)
Acute 243.290
Lead NC 9.1153 FW(7Q10s) 234.8070 ug/L 27 0 2.500 - _ ____ _ ___ _ __- _ _ _ _ _ _ _ ___ _ _
Chronic: 9.507 No detects,all values less than 5 ug/L.No monitoring
V(t DFTFCT required
9595 Final FW RPA w_upstream avg data column_diss to totalmetals_rxxtetects_lirniteddefautts_full red_2017 1121,ma
Page 1 of 2 8/12/2019

Rocky River WWTP Z Outfall 001
NC0046728 Freshwater RPA- 95%Probability/95%Confidence Using Metal Translators Qw = 7.5 MGD
Acute NO WQS
Molybdenum NC 2000 HH(7Q10s) ug/L 18 16 572.9 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 2,086.0 No RP, Predicted Max<50-%of Allowable Cw-No
No value>Allowable Cw Monitoring required
Acute(FW): 8222
Nickel NC 87.8797 FW(7Q10s) 793.5390 µg/L _ _-___ _._ _ _ _ _ _ _ _ _ _ _
22 1 19.7 Chronic(FW) 91.7 N RRP, Predicted Max<50-%of Allowable Cw-No
No value>Allowable Cw Monitoring required
Nickel NC 25.0000 WS(7Q10s) AWL Cbroolc(WS)-.—.261-- ------------- —
No value>Allowable('..v
Acute: 58.0
Selenium NC 5 FW(7Q10s) 56 ug/L 22 0 5.0 __ _ ._.___ ___ _ _ _.,
Chronic: 5.2 No RP,Predicted Mart 5094 ofllowable Cw
NO DETECTS Max MD defer to LTMP. Pennittee should use sufficiently
sensitive test methods with a target PM.of 1 ug/L.
Acute: 1.771
Silver NC 0.06 FW(7Q10s) 1.7091 ug/L 22 0 2.500 —_ _ ____ __ _ _ _ _ _ _ _ __—__ _ ___
Chronic: 0.063 Defer to LTMP.Permittee should use sensitive test
`..)DETECTS Ma, methods with a target POL of 1 ug/L.
Acute: 308.7 No RP, Predicted Max<50%of Allowable Cw-No
Zinc NC 299.5329 FW(7QIOs) 297.9760 ug/L 26 26 111.0 Monitoring required
' ___ _—__ _ _ — — — — — — — — —
Chronic: 312.4
1 Nu value •Allowable(w
9595 Final FW RPA w_upstream avg data column_diss to totaimetals_nodetects_limlteddefaults_full prod_2017_1121,rpa
Page 2 of 2 8/12/2019

Date:8/12/2019
Pissolved to Total Metal Cakulator FACILITY:Rocky River W WTP O14fall 001
NPDES PERMIT:NC00467211 Dissolved to Total Metal Calculator
DO NDlepter am7 data directly Into this spreadsheet.
Enter data onto"Table 1'under the Input Sheet and enter ecaneaence with Fader al Peoulrtunne permit limitation must be written ea Total Meta*oer 40 CFR 122.45(c)
"Effluent Hardness'under the Data Sheet.
In accordance with 40 CFR 122.45(c),permits are,have and Rymer R.celvbe Rye.aheern rIPO[a Tpy ee,ee' r,eonblred Combined u.mem treason. Men
must be written as total metals. aYaea alrs.n Bobs Heehaw Hail. s .o.. vowia a 1- Hearer
UMW summer 7010 to NJ feeefart {bled valve- dss.4n hub aecen0eeon oae5n.aen wowMop
This calculator has been Inserted Into the RPA to calculate Total s �D) ,lNapl em i't' 0.014 0%44 In..act �t0it Mt sir Lt arl7
Metal allowable allocations once Table 1 has been completed 9.6000 o.aae 02710 7.5000 to mops l ro2s4 p6.M7e4 06.6131 32 9442957170 NStt
(Input Sheet)and Effluent hardness has been entered(Data Upstream Hard Avg(n1plL)= 32.04286 ACsK nO.214
Sheets FFF Herd Avg(mak.)= 70.54516 ACC,' ee.00ass
1) Following the spreadsheet from left to right. First tarwelrewrtf- 106EPA Tadim TrI WN.COAN104 TS(Identify obsolete.b ut FORCO Branch le nben In fwltya tnAPrstw7
en.,the allowable allocations for the dissolved metals will PARAMETER e a »Meese trenelelonemine p a............appear for all the metals listed once Table 1 is complete and ,,.ve 1ee,0e Molar ra„e,+. I 7uy
tie, Wham p1(
effluent hardness entered.Use a default value of 25 mg/L If ------- -- 5r`
Cadmium(d) .__ _. '''O _.0252 1.27 7.88
no hardness data isavailable. Second,the -Cd.Troul abalone 4a4 0252 1.27 410
Dissolved Metal allocations are divided by the Translators to ciremufn lg(d4ll 55 47? 0202 270.38 203,1.47
determine the Total Metals that can be allocated to the Chromium Vi idl .1 1e tom 11.00 16.00
Permittea.These Total Metals values are a utonvtically Ch`omhrrn Total Itl N/A N/A
•
inserted Into Table 2 and are the allowable Total Metal Copps ldifhl e6 45 0.348 18.70 27.34
Lead ldgh) 1.68 411 0.184 0.12 234.51
allocations determined for the Permitter,prior to allowing Nlefrl(dfh) 38 -r' 0.432 87.66 7J5.5 t
for dilution.See Input sheet Table 2.The final acute and NI.WS streams(1) ____ 25 WA
chronic values shown under the RPA sheet are the Total Silver We h,ecuta) 0.06_ '71 1.000 0.06 1.71
Metal values listed in Table 2 divided by the acute and Zinc(dghl BE M 0,288 209.53 297 08
chronic IWC,respectively. *algi
2) The Translators used In the freshwater RPA are the Partition lA..0 0) 1r 340 10001 100 340
Coefficients published by US EPA In 1984.They ere TSS
dependent equations and can be found listed with the WQS (d)-dbs0Ned metal standord.see ISA NCAC07B.0211 Sr more mtormenon.
hardness dependent equations under the sheet labeled lid=haraness.depemmi dhlo0ed metal so retard.Se*ISA NCAC 0211.0211kr more lntonweens
Equations.Affixed T55 value of 10 mail is used to calculate (I)-bared upo nrn n evasuantoftool recoveable metal.See ISA NCAC 0213.0211 br more Information.
The Human Health 0andard tor Nldei In Water Supply Streams Is 2S mg/l.whet,Is Total Recoverable metal sondsnn
the Translator values. .rn,Hu-ar Heath rbndard Or Weenie Is 10 pet/L bald,Is Total Recovereble metal abode re.
3) Pretreatment Facilities-PERCS Mil need a copy of the
Dissolved to Total Metal Calculator spreadsheet and the
RPA sheet along with the Final Permit Pretreatment
Facilities are required to renew their Headwords Analysis
after renewal of their permits.Since all their metal
allocations are likely to change PERCS needs to see any new
metal permit limits and the allowable allocations for the
dissolved metals to assess Maximum Allowable headwork&
Loading(MARL)numbers for each metal based on the
Combined Hardness values used In the permit wnters RPA
cakulatioru.
4l For Cadmium,Lead,Nickel,Chromium and Beryllium.0 all
• the effluent sampling data for the last three to five years
shows the pollutant at concentrations less than the Practical
QuamitatNe Level(PQL),It Is not likely a limit or monitoring
will be put in the permit.However,if the estimated NPDES
permit limit Is less than the Practical Quantitative Limit
(particularly,Cadmium and Lead)and the pollutant Is
believed to be present,to assess compliance with the new
standards and for future permit limit development,
monitoring for the pollutant will be required.If the facility Is
monitoring for the pollutant in its Pretreatment LIMP,no
monitoring Is needed in the permit.
5) For monitoring and compliance purposes If Total Chromium

Permit No. NC0036277
NPDES Implementation of Instream Dissolved Metals Standards-Freshwater 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,metal 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/Aquatic Life Protection
Parameter Acute FW, 14/1 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 mgfL for aquatic life protection).
Table 2.Dissolved Freshwater Standards for Hardness-Dependent Metals
The Water Effects Ratio(WER)is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph(11)(d)
Metal NC Dissolved Standard, µg/I
Cadmium,Acute WER*{1.136672-[ln hardness](0.041838)} e^{0.9151 [In hardness]-3.1485}
Cadmium,Acute Trout waters WER*{1.136672-[ln hardness](0.041838)) a"{0.9151[In hardness]-3.6236}
Cadmium,Chronic WER*{1.101672-[ln hardness](0.041838)) •e^{0.7998[ln hardness]-4.4451}
Chromium III,Acute WER*0.316•e^{0.8190[In hardness]+3.7256}
Chromium III,Chronic WER*0.860•e^{0.8190[In hardness]+0.6848}
Copper,Acute WER*0.960•e^{0.9422[In hardness]-1.700)
Copper,Chronic WER*0.960•e^{0.8545[In hardness]-1.702}
Lead,Acute WER*{1.46203-[In hardness}(0.145712)} •e^{1.273[In hardness]-1.460}
Lead,Chronic WER*{1.46203-[In hardness](0.145712)) •e^{1.273[In hardness]-4.705}
Nickel,Acute WER*0.998•e^{0.8460[ln hardness]+2.255)
Nickel,Chronic WER*0.997•e^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No. NC0036277
Silver,Acute WER#0.85•e^{1.72[In hardness]-6.59)
Silver,Chronic Not applicable
Zinc,Acute WER•0.978•e^{0.8473[In hardness]+0.884}
Zinc,Chronic WER''0.986•e^{0.8473[In hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPM
The RPA process itself did not change as the result of the new metals standards.However,application of
the dissolved and hardness-dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness-based standards require some knowledge of the effluent and instream(upstream)hardness
and so must be calculated case-by-case for each discharge.
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 default translator values developed for each metal(more on that
below),but it is also possible to consider case-specific translators developed in accordance with
established methodology.
RPA Permitting Guidance/WOBELs for Hardness-Dependent Metals -Freshwater
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 critical low-flow values for the receiving stream.
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 permitlimit 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.
1. To perform a RPA on the Freshwater hardness-dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream,7Q10(the spreadsheet automatically calculates
the 1Q10 using the formula 1Q10=0.843(s7Q10,cfs)0.993
• Effluent hardness and upstream hardness,site-specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness-dependent metal of concern and for
each individual discharge,the Permit Writer must first determine what effluent and instream
(upstream)hardness values to use in the equations.
The permit writer reviews DMR's,Effluent Pollutant Scans,and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values,upstream of the discharge.
If no hardness data is available,the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L(CaCO3 or(Ca+Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L,respectively.
If the use of a default hardness value results in a hardness-dependent metal showing reasonable
potential,the permit writer contacts the Permittee and requests 5 site-specific effluent and
upstream hardness samples over a period of one week.The RPA is rerun using the new data.
Page 2 of 4

Permit No.NC0036277
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness(chronic)
=(Permitted Flow,cfs*Avg.Effluent Hardness,mg/L)+(s7010,cfs*Avg.Upstream Hardness,mg/L)
(Permitted Flow,cfs+s7Q10,cfs)
The Combined Hardness for acute is the same but the calculation uses the 1Q10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal,using the EPA Default Partition Coefficients(DPCs)or site-specific translators,if any
have been developed using federally approved methodology.
EPA default partition coefficients or the"Fraction Dissolved"converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in-stream
ambient conditions.This factor is calculated using the linear partition coefficients
found in The Metals Translator: Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007,June 1996)and the
equation:
Cam- 1
Ctotat 1 + { [Kyo] [s0*11 [10-6] }
Where:
ss=in-stream suspended solids concentration[mg/1],minimum of 10 mg/L used,
and
Kpo and a=constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals.A list of constants used for each hardness-dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient(or
site-specific translator)to obtain a Total Recoverable Metal at ambient conditions.
In some cases,where an EPA default partition coefficient translator does not exist(ie. silver),the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions.This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals.For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. 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+Ow)(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 s7Q10)
s7Q10=summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water,fish,and shellfish from noncarcinogens(cfs)
*Discussions are on-going with EPA on how best to address background concentrations
Flows other than s7Q10 may be incorporated as applicable:
1Q10=used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0036277
QA=used in the equation to protect human health through the consumption of water,
fish,and shellfish from carcinogens
30Q2=used in the equation to protect aesthetic quality
6. 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 years prior to the date of the permit
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.
7. 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.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water QualityStandards.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 III or VI.In these cases,the projected maximum concentration(95th%)for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling,upstream of the discharge,are
inserted into all permits with facilities monitoring for hardness-dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter Value Comments(Data Source)
Average Effluent Hardness(mg/L) 139.47 DMRs
[Total as,CaCO3 or(Ca+Mg)]
Average Upstream Hardness(mg/L) 50.33 DMRS
[Total as,CaCO3 or(Ca+Mg)]
7Q10 summer(cfs) 1.80 BIMS
1Q10(cfs) 1.51 Calculated from 7Q10
Permitted Flow(MGD) 12.0 BIMS
Date:6/24/2019
Permit Writer:Min Xiao
Page 4 of 4

8/7/19 WQS= 12 ng/L MERCURY WQBEL/TBEL EVALUATION
V:2017-1
Facility Name: Rocky River WWTP(NC0046728) No Limit Required
No MMP Required
Total Mercury 1631E PQL=0.5 ng/L 7Q10s= 0.500 cfs WQBEL= 12.52 ng/L
Date Modifier Data Entry Value Permitted Flow= 7.500 47 ng/L
12/14/15 < 1 0.5 0.5 ng/L-Annual Average for 2015
04/11/16 < 1 0.5
07/13/16 0 0
10/04/16 0 0 0.2 ng/L-Annual Average for 2016
01/10/17 < 1 0.5
04/04/17 12 1.2
07/11/17 2.22 2.22
07/18/17 < 1 0.5
08/08/17 1.4 1.4
09/19/17 < 1 0.5
10/17/17 < 1 0.5
11/14/17 < 1 0.5
12/05/17 < 1 0.5 0.9 ng/L-Annual Average for 2017
01/09/18 < 1 0.5
02/13/18 < 1 0.5
03/06/18 1.33 1.33
04/10/18 1 1
05/08/18 2.45 2.45
06/05/18 1.4 1.4
07/10/18 1.75 1.75
10/16/18 1.2 1.2 1.3 ng/L-Annual Average for 2018
01/08/19 1.03 1.03
04/09/19 < 1 0,5 0.8 ng/L-Annual Average for 2019

Rocky River WWTP(NC0046728)
Mercury Data Statistics(Method 1631E)
2015 2016 2017 2018 2019
#of Samples 1 3 9 8 2
Annual Average, ng/L 0.5 0.2 0.9 1.3 0.8
Maximum Value, ng/L 0.50 0.50 2.22 2.45 1.03
TBEL, ng/L 47
WQBEL, ng/L 12.5

NC0024911 Buncombe County MSD 8/8/2019
BOD monthly removal rate TSS monthly removal rate
Month RR(%) Month RR(%) Month RR(%) Month RR(%)
June-16 98.77 December-18 98.56 June-16 98.14 December-18 97.39
July-16 98.27 January-19 99.33 July-16 100.00 January-19 98.27
August-16 99.16 February-19 99.13 August-16 99.85 February-19 98.01
September-16 99.87 March-19 99.31 September-16 100.00 March-19 98.23
October-16 99.90 April-19 99.20 October-16 100.00 April-19 98.46
November-16 99.71 May-19 99.21 November-16 100.00 May-19 98.57
December-16 99.58 June-19 December-16 100.00 June-19
January-17 99.03 July-19 January-17 98.28 July-19
February-17 99.41 August-19 February-17 98.39 August-19
1 March-17 99.35 / September-19 March-17 98.37 September-19
April-17 99.26 1 October-19
April-17
p 98.44 October-19
May-17 99.16 November-19 May-17 98.56 November-19
June-17 99.16 December-19 June-17 98.64 December-19
July-17 99.31 January-20 July-17 98.52 January-20
August-17 99.42 February-20 August-17 98.54 February-20
September-17 99.43 March-20 September-17 98.47 March-20
October-17 99.35 April-20 October-17 98.32 April-20
November-17 99.32 May-20 November-17 98.31 May-20
December-17 99.32 June-20 December-17 98.36 June-20
January-18 98.71 July-20 January-18 97.44 July-20
February-18 98.99 August-20 February-18 98.11 August-20
March-18 99.00 September-20 March-18 98.11 September-20
April-18 99.11 October-20 April-18 98.08 October-20
May-18 99.33 November-20 May-18 98.19 November-20
June-18 99.23 December-20 June-18 98.28 December-20
July-18 99.20 January-21 July-18 98.08 January-21
August-18 99.23 February-21 August-18 98.22 February-21
September-18 99.22 March-21 September-18 98.12 March-21
October-18 99.24 April-21 October-18 97.94 April-21
November-18 99.00 May-21 November-18 98.11 May-21
Overall BOD removal rate 99.22 Overall TSSD removal rate 98.52

NPDES/Aquifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART: PERMIT WRITERS-AFTER you pet this form
Check all that apply back from PERCS:
Date of Request 7/22/2019 municipal renewal X -No PERCS if LTMP/STMP data we said should
Requester Mn Xiao new Industries be on DMRs is not really there,so we can get it for
Facility Name Rocky River WWTP WWTP expansion you(orPOTW).
-Notify PERCS if you want us to keep a specific
Permit Number NC0046728 Speculative ilmits POC in LTMP/STMP so you will have data for next
Region Mooresville stream redass. permit renewal.
Basin Yadkin-Pee Dee outfall relocation -Email PER'c '+ aft permit,fact St et,RPA.
7010 change -Send PERCS paper copy of permit(w/o NPDES
other boilerplate),cover letter,final fact sheet. Email RPA
other if changes.
check applicable PERCS staff: Other Comments to PERCS:
)BRD,CPF,CTB.FRB,TAR
Vivian Thong(807-310) I-Facility is rated 7.5 MGD wtih 3 non-catagorical SIUs listed in its
CHO,HIW,LTN,LUM,NES,NEW,ROA,YAD application(by May,2018),and is listed in POTW with pretreatment
X Monti Hassan(807-6314) spreadsheet.
PERCS PRETREATMENT STAFF COMPLETES THIS PART:
Status of Pretreatment Program(check all that apply)
1)facility has no SIU's,does have Division approved Pretreatment Program that is INACTIVE
2)facility has no SIU's,does not have Division approved Pretreatment Program
3)facility has Sills and DWQ approved Pretreatment Program(list"DEV"if program still under development)
3a)Full Program with LTMP
3b)Modified Program with STMP
4)additional conditions regarding Pretreatment attached or listed below
Flow,MGD Permitted Actualp' Time period for Actual STMP time frame: I
Industrial 1,05 (N-Ca '' l/ i l .— L 1 1 Cti Most recent:
Uncontrollable rile Next Cycle:
Parameter of
I POC due to Required POTW POC STMP LIMP
NPDESI Non- Required try POC due
E GF Concern(POC) Mich Permit EPA* by 503 WSW"'SIU"' (Explain
Effluent Effluent
Check List Limit Sludge" b.Iow)•••• Frog Fr q
V/ BOD V 4
1/ TSS ✓ V 4 Q M Q=Quarterly
VNH3 t/ 4 Q M M=
✓ MonthlyArsenic ✓ 4 Q M
' Ni Cadmium J 1/ ✓ 4 Q M
.I Chromium 4 4 Q M
Ni Copper J ✓ ✓ 4 Q M
✓ Cyanide 1,-- V 4 Q M Is all data on DMRs?
Mercury J ✓ ✓ _4 Q M NO(attach data) V
V/Moiybdenum ✓ 4 Q M
J Nickel 1: l- '/ ', 4 Q M
✓Silver 4 Q M
Selenium tr- f 4 Q M
Zinc 1 ,l %/' V 4 Q M Is data in spreadsheet?
Total Nitrogen 4 Q M YESjemail to writer)-
Phosphorus 4 Q M NO
4 Q M
4 Q M
_ 4 Q M
4 Q M
•Always in the LTMP/STMP "Only in LTMP/STMP If sludge land app or composte(dif POCs for Incinerators)
•••Only in LTMP/STMP while SIU still discharges to POTW •'•'Only in LTMP/STMP when pollutant is still of concern to POTW
Comments to Permit Writer(ex..explanation of any POCe: Info you have on IU related Investigations into NPDES problems):
Rocky River WWTP-PERC NPDES_PrebeatmenLrequestfonn.xlsx
Revised;July 24,2007