NC0046728_Draft permits for public notice_20190822

Strickland, Bev
From: Basinger, Corey
Sent: Thursday, August 22, 2019 11:20 AM
To: Scheller, Roberto
Subject: FW: Draft permits for public notice - Rocky River WWTP (NC0046728)
Attachments: Draft Cover Letter & Permit.pdf, Draft Fact Sheet.pdf, Fact Sheet Attachments.pdf
For review and comment back to Min.
CB
W. Corey Basinger
Regional Supervisor
Mooresville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
Chairman
Water Pollution Control System Operators Certification Commission
[phone] office
[phone] office direct line
Email: corey.basingera-ncdenr.gov
610 E. Center Avenue
Suite 301
Mooresville, NC 28115
From: Xiao, Min
Sent: Thursday, August 22, 2019 10:53 AM
To: Basinger, Corey <[e-mail]>
Subject: Draft permits for public notice - Rocky River WWTP (NC0046728)
Good morning Corey,
The draft permit for Rocky River WWTP (NC0046728) in the Mooresville region is going out to public notice this week.
Attached please find the draft cover letter, permit, and fact sheet with attachments. Please let me know if you or your
staff have any comments in 30 days.
Thanks,
Min Xiao, El
Environmental Engineer
NPDES Complex Permitting
NC DEQ / Division of Water Resources / Water Quality Permitting
919-707-3644
min.xiao(c-)ncdenr.gov
512 North Salisbury St.
1617 Mail Service Center, Raleigh, NC, 27699-1617

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Mr. Miles Atkins, Mayor
Town of Mooresville
PO Box 878
Mooresville, North Carolina 28115
Dear Mr. Atkins:
NORTH CAROLINA
Environmental Quality
August 19, 2019
Subject: Draft NPDES Permit Renewal
Permit NCO046728
Rocky River WWTP
Iredell County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this
draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are
several changes from the existing permit, including the following:
• 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.
• 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/I.,, <
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
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
NGQiH CAROLRIN
o�.rwar,.w..r+a.p 919.707.9000

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 0)(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.
The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included in this
draft document (cover, map, and Part 1). The conditions are the same as in your current permit except that
agency and division names have been updated. The latest version is available at ems://bit.h /2BZ4xxx and
can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Iredell County area, soliciting public comments on this draft permit. Please provide any
written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail
Service Center, Raleigh, NC 27699-1617 no later than 30 days after receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit. If you have questions concerning this draft permit,
please call me at [phone] or by email at [e-mail].
Sincerely,
Min Xiao, Engineer
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
Rocky River WWTP Manager/James Levis
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Hannah Headrick
DWR/Mooresville Regional Office / Water Quality
DWR/Operator Certification Program/Maureen Kinney
Page 2 of 2

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 Month XX, 2019.

This permit and authorization to discharge shall expire at midnight on Month XX, 20XX.

Signed this day Month XX, 2019.

Draft
________________________________________________
Linda Culpepper, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0046728
Page 2 of 10

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 TrojanUV3000plus™ 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.
Permit NC0046728
Page 3 of 10

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 monitored1 by the Permittee as specified below:

Effluent Characteristics Discharge Limitations Monitoring Requirements
Parameter Code Monthly
Average
Weekly
Average
Daily
Maximum
Measuremen
t Frequency
Sample
Type
Sample
Location 2
Flow 50050 7.5 MGD Continuous Recording I or E
BOD5 (20ºC) 3 [Summer] 80082 5.0 mg/L 7.5 mg/L Daily Composite I and E
BOD5 (20ºC) 3 [Winter] 80082 10.0 mg/L 15.0 mg/L Daily Composite I and E
Total Suspended Solids 3 CO530 30.0 mg/L 45.0 mg/L Daily Composite I and E
NH3 as N [Summer] CO610 1.0 mg/L 3.0 mg/L Daily Composite E
NH3 as N [Winter] CO610 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
(geometric mean) 31616 200/100ml 400/100ml Daily Grab E
Total Residual Chlorine 4 50060 17 µg/L Daily Grab E
Temperature (oC) 00010 Daily Grab E
Temperature (oC) 00010 3/Week Grab U and D
Total Nitrogen 5 (mg/L) CO600 Monthly Composite E
Total Phosphorus (mg/L) CO665 Monthly Composite E
Total Copper 01042 19.5 ug/L 28.3 ug/L Monthly Composite E
Total Hardness [as CaCO3]
(mg/L) 6 00900 Quarterly Composite E
Total Hardness [as CaCO3]
(mg/L) 7 00900 Quarterly Grab U
Chronic Toxicity 8 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 ½ 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.
Permit NC0046728
Page 4 of 10

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 January, April, July and October [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.

Permit NC0046728
Page 5 of 10

A. (2) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]

The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 90% at 7.5 MGD.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the “North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,” Revised December 2010, or subsequent versions or
“North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised- December 2010) or
subsequent versions. The tests will be performed during the months of January, April, July, and October.
These months signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent
sampling for this testing must be obtained during representative effluent discharge and shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.

If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple-concentration testing shall be performed at a minimum, in each of the two
following months as described in “North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure” (Revised-December 2010) or subsequent versions.

All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original) is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621

Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after
the end of the reporting period for which the report is made.

Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.

Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the
facility name, permit number, pipe number, county, and the month/year of the report with the notation of “No
Flow” in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.

Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month. Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three month time interval that begins on the first day of the month in which toxicity testing is required
by this permit and continues until the final day of the third month.

Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream, this permit may be re-opened and modified to include
alternate monitoring requirements or limits.

NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

Permit NC0046728
Page 6 of 10

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
Reporting. Test results shall be reported on DWR Form-A MR-PPA1 (or in a form approved by the Director) by
December 31st 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.
Permit NC0046728
Page 7 of 10

Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal facilities
that are subject to the Effluent Pollutant Scan requirements listed above are also subject to additional toxicity
testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5). The US EPA requires four (4) toxicity
tests for a test organism other than the test species currently required in this permit. The multiple species tests
should be conducted either quarterly for a 12-month period prior to submittal of the permit renewal application, or
four tests performed at least annually in the four and one half year period prior to the application. These tests shall
be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple species toxicity test
results shall be filed with the Aquatic Toxicology Branch at the following address:

North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621

Contact the Division’s Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the additional
toxicity tests and reporting requirements. Results should also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A, when submitting the permit renewal application to the NPDES Permitting
Unit.

A. (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)]
The permittee shall report discharge monitoring data electronically using the NC DWR’s Electronic Discharge
Monitoring Report (eDMR) internet application.

Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit
DMRs electronically using the internet. Until such time that the state’s eDMR application is compliant with
EPA’s Cross-Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:

NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617

Permit NC0046728
Page 8 of 10

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(l)(9), the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA’s website resources to identify the initial recipient for
the electronic submission.
Initial recipient of electronic NPDES information from NPDES -regulated facilities means the entity (EPA or
the state authorized by EPA to implement the NPDES program) that is the designated entity for receiving
electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA’s NPDES Electronic Reporting Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-elimination-
system-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the “Reporting Requirements” section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver, a permittee must first submit an electronic reporting waiver request to the Division. Requests
for temporary electronic reporting waivers must be submitted in writing to the Division for written approval at
least sixty (60) days prior to the date the facility would be required under this permit to begin submitting
monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the Division unless the
permittee re-applies for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request
may submit monitoring data and reports on paper to the Division for the period that the approved reporting
waiver request is effective.

Permit NC0046728
Page 9 of 10

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)]
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.)]
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].

Permit NC0046728
Page 10 of 10

Page 1 of 10

Fact Sheet
NPDES Permit No. NC0046728

Permit Writer/Email Contact Min Xiao, [e-mail]:
Date: July 18, 2019
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017

Permitting Action:
☒ Renewal
☐ Renewal with Expansion
☐ New Discharge
☐ 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
 For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
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 TrojanUV3000plus™ 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: Iredell
Region Mooresville

Page 2 of 10

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 001 – Dye 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-basin/HUC: 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 MGD 4.41 10.39 2.77 MA 7.5
BOD summer mg/l < 2.71 18.00 0 WA 7.5
MA 5.0
BOD winter mg/l < 2.93 42.00 0 WA 15.0
MA 10.0

Page 3 of 10

NH3N summer mg/l < 0.20 4.80 0 WA 3.0
MA 1.0
NH3N winter mg/l < 0.20 6.2 0 WA 6.0
MA 2.0
TSS mg/l < 4.47 44 0 WA 45.0
MA 30.0
pH SU 7.42 8.00 6.44 6.0 ≤ pH ≤ 9.0
Fecal coliform #/100 ml 29.05 1910.00 1.00
(geometric)
WA 400
MA 200
DO mg/l 8.99 11.26 6.27 DA ≥6.0
TRC µg/l 15.82 34.00 0
DM 17.0 (<
50
compliance)
Cyanide ug/l 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/l 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/l 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 4 of 10

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: 1Q10 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 CORMIX 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/l 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/l, NH3 as N limit of 1.0 mg/l, 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 5 of 10

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/l (summer) and 1.8 mg/l (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/l (acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/l 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 Level/95% Probability; 2) assumption of zero
background; 3) use of ½ 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 6 of 10

Attached are the RPA results, as well as a copy of the guidance entitled “NPDES Implementation of
Instream 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/l) 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/l

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 0.2 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 7 of 10

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/l
BOD5/TSS for Monthly Average, and 45 mg/l for BOD5/TSS for 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(l) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a

Page 8 of 10

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 finalized 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 MGD
Parameter Current Permit Proposed Change Basis for Condition/Change
Flow MA 7.5 MGD No change 15A NCAC 2B .0505
BOD5 Summer:
MA 5 mg/l
WA 7.5 mg/l
Winter:
MA 10 mg/l
WA 15 mg/l
No change Based on recommendations
contained in the 2003 Yadkin-Pee
Dee Basinwide Water Quality
Management Plan
NH3-N Summer:
MA 1 mg/l
No change Based on recommendations
contained in the 2003 Yadkin-Pee

Page 9 of 10

WA 3 mg/l
Winter:
MA 2 mg/l
WA 6 mg/l
Dee Basinwide Water Quality
Management Plan
TSS MA 30 mg/l
WA 45 mg/l
No change Based on the requirements of the 40
CFR 133.102
Fecal coliform MA 200 /100ml
WA 400 /100ml
No change WQBEL. State WQ standard, 15A
NCAC 2B .0200
DO > 6 mg/l 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/l No change TRC WLA Calculations
Cyanide MA 5.0 ug/l
DM 22.8 ug/l
Remove monitoring
and limits
Based on Reasonable Potential
Analysis
Total Copper Quarterly monitoring MA 19.5 ug/l
DM 28.3 ug/l
Based on Reasonable Potential
Analysis
Total Lead Quarterly monitoring Remove monitoring Based on Reasonable Potential
Analysis
Total Zinc Quarterly monitoring Remove monitoring Based on Reasonable Potential
Analysis
Mercury
Minimization Plan
(MMP)
MMP Remove MMP Mercury TMDL evaluation.
Electronic
Reporting
No requirement Add Electronic
Reporting Special
Condition
In accordance with EPA Electronic
Reporting Rule 2015.
MGD – Million gallons per day, MA - Monthly Average, WA – Weekly Average, DM – Daily Max

13. Public Notice Schedule:

Permit to Public Notice: xx/xx/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 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.

Page 10 of 10

14. Fact Sheet Addendum (if applicable):

Were there any changes made since the Draft Permit was public noticed (Yes/No):
If Yes, list changes and their basis below:

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

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�a
Water Resources
Environmental. Quality
November 15, 2017
Ms. Allison Kraft, Interim Utilities Director
Town of Mooresville
P.O. Box 878
Mooresville, North Carolina 28115
Dear Ms. Kraft:
;
I�,?bY COOPER
Er;
Goy�rnor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
Subject: Compliance Evaluation Inspection
Town of Mooresville/Rocky River W WTP
NPDES Permit No. NCO046728
Iredell County
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 [phone], or via email at [e-mail].
Enclosure:
Inspection Report
cc: Iredell County Health. Department
MSC-1617 Central -Basement
W.
Sincerely,
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Division of Water. Resources, NCDEQ
State of North Carolina I Environmental Quality) Water Resources I Water Quality Regional Operations
Mooresville Regional Office 1610 Fast Center Avenue, Suite 3101 Mooresville, North Carolina 29115
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 L_�N � 2 15 1 3 NCO046728 111 121 17/11/09 I17 18 I2I 19 I G I 20I
211 I•JI I I1__I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I r6
I
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA -Reserved
67
12.0 70 Id I 71 IN itI 72 I N I 73 �74 751
LJ I I I I I II80
JData LJ
Section B: Facility
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
369 Johnson Dairy Rd
Exit Time/Date
Permit Expiration Date
Mooresville NC 28115
02:30PM 17/11/09
18/11/30
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
111
James Andrew Levis/ORC/704-662-8341/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Allison Kraft,PO Box 878 Mooresville NC 28115/Interim Utilities
Director/704-799-4066/ NO
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenance Records/Reports
Self -Monitoring Program Sludge Handling Disposal Facility Site Review Effluent/Receiving Waters
Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Wes Bell MRO WQ//704-663-1699 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#

NPDES yr/mo/day Inspection Type
31 NCOD46728 I11 121 17/11/09 117 18 I C I
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#

Permit: NCO046728 Owner - Facility: Rocky River WWTP
Inspection Date: 11/0912017 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
❑
❑
M
❑
application?
Is the facility as described in the permit?
❑
0
❑
❑
# Are there any special conditions for the permit?
M
❑
❑
❑
Is access to the plant site restricted to the general public?
0
❑
❑
❑
Is the inspector granted access to all areas for inspection?
■
❑
❑
❑
Comment: The Permit's facilitv 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
Are records kept and maintained as required by the permit?
Is all required information readily available, complete and current?
Are all records maintained for 3 years (lab. reg. required 5 years)?
Are analytical results consistent with data reported on DMRs?
Is the chain -of -custody complete?
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?
Has the facility submitted its annual compliance report to users and DWQ?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator
on each shift?
Is the ORC visitation log available and current?
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility classification?
Is a copy of the current NPDES permit available on site?
Facility has copy of previous year's Annual Report on file for review?
— .,..1�
■ ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
M
■
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ ❑
Page# 3

Permit: NCO046728
Inspection Date: 11109/2017
Record Keeping
Owner - Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Comment: The records reviewed during the inspection were organized and well maintained. Discharae
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 (NOVA
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?
❑
❑
❑
Are all other parameters(excluding field parameters) performed by a certified lab?
❑
❑
❑
# Is the facility using a contract lab?
❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
❑
❑
❑
Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
❑
❑
❑
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
❑
❑
❑
Comment: Influent and effluent analyses including field are performed under the Town's Laboratory
Certification #173. Pace Anal ical 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
❑
❑
❑
Is sample collected above side streams?
M
❑
❑
❑
Is proper volume collected?
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 sampling performed according to the permit?
0
❑
❑
❑
Comment: The subiect permit requires BOD and TSS composite samples. The internal sampler
temperature was two degrees Celsius and collecting approximately 140 mi. aliquots at the
time of the inspection. The facility staff perform and document daily aliquot verifications on
the sampler.
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional? ■ ❑ ❑ ❑
Is sample collected below all treatment units? ■ ❑ ❑ ❑
Page# 4

Permit: NCO046728 Owner - Facility: Rocky River WWTP
Inspection Date: 11/09/2017 Inspection Type: Compliance Evaluation
Effluent Sampling
Yes No NA NE
Is proper volume collected?
❑
❑
❑
Is the tubing clean?
L_ ❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
❑
❑
❑
Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
' ❑
❑
❑
representative)?
Comment: The subiect permit reouires 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 same ler.
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, and ❑ ❑ ® ❑
sampling location)?
Comment: The Division has conditionally waived the instream monitoring reouirements 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? M ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable M, ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: The wastewater treatment facilitv 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
Is the basin aerated?
Is the basin free of bypass lines or structures to the natural environment?
Is the basin free of excessive grease?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Are audible and visual alarms operable?
# Is basin size/volume adequate?
Yes No NA NE
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
hw ❑ ❑ ❑
❑ ❑ ■ ❑
so ❑ ❑ ❑
Page# 5

Permit: NC0046728
Inspection Date: 11/09/2017
ualization Basins
Owner - Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Comment: Both wet weather equalization tanks 0 MG each] for the Rocky River Sewer Pump Station,
were operational.
Pump Station - Influent
Is the pump wet well free of bypass lines or structures?
Is the wet well free of excessive grease?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Is SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Yes No NA NE
•
❑
❑
❑
•
❑
❑
❑
•
❑
❑
❑
■
❑
❑
❑
•
❑
❑
❑
•
❑
❑
❑
❑
❑
■
❑
Comment: The screw pumps (traditional plant] and submersible pumas (package plants) were
werational and in service.
Bar Screens
Yes No NA NE
Type of bar screen
a.Manual
❑
b.Mechanical
Are the bars adequately screening debris?
0
❑
❑
❑
Is the screen free of excessive debris?
0
❑
❑
❑
Is disposal of screening in compliance?
0
❑
❑
❑
Is the unit in good condition?
0
❑
❑
❑
Comment: Screenings are disposed by a contracted company
Benfield Sanitation at a permitted
landfill.
The traditional plant and package slants are equipped
with separate mechanical screening
§vystems_(both operational and in service).
Chemical Feed
Is containment adequate?
Is storage adequate?
Are backup pumps available?
Is the site free of excessive leaking?
Yes No NA NE
■ ❑ ❑ ❑
M ❑ ❑ ❑
M ❑ ❑ ❑
■ ❑ ❑ ❑
Comment: Sodium hydroxide is added to the influent [prior to aeration basins] to maintain appropriate
alkalinity/pH levels.
Aeration Basins
Yes No NA NE
Page# 6

Permit: NCO046728
Inspection Date: 11/09/2017
Aeration Basins
Mode of operation
Type of aeration system
Is the basin free of dead spots?
Are surface aerators and mixers operational?
Are the diffusers operational?
Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin's surface?
Is the DO level acceptable?
Is the DO level acceptable?(1.0 to 3.0 mg/1)
Owner - Facility: Rocky River WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Ext. Air
Surface
•
❑
❑
❑
•
❑
❑
❑
■
❑
❑
❑
E
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
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?
N
❑
❑
❑
Is the site free of excessive buildup of solids in center well of circular clarifier?
■
❑
❑
❑
Are weirs level?
■
❑
❑
❑
Is the site free of weir blockage?
■
❑
❑
❑
Is the site free of evidence of short-circuiting?
i
❑
❑
❑
Is scum removal adequate?
■
❑
❑
❑
Is the site free of excessive floating sludge?
■
❑
❑
❑
Is the drive unit operational?
E
❑
❑
❑
Is the return rate acceptable (low turbulence)?
0
❑
❑
❑
Is the overflow clear of excessive solids/pin floc?
E
❑
❑
❑
Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth)
0
❑
❑
❑
Comment:
Pumps-RAS-WAS
Yes No NA NE
Are pumps in place?
N
❑
❑
❑
Are pumps operational?
®
❑
❑
❑
Are there adequate spare parts and supplies on site?
❑
❑
❑
■
Comment:
Filtration (High Rate Tertiary) Yes No NA NE
Type of operation: Cross flow
Page# 7

Permit: NCO046728
Owner - Facility: Rocky River WWTP
Inspection Date: 11109/2017
Inspection Type: Compliance Evaluation
Filtration (High Rate Tertiary)
Yes No NA NE
Is the filter media present?
❑
❑
❑
Is the filter surface free of clogging?
❑
❑
❑
Is the filter free of growth?
0
❑
❑
❑
Is the air scour operational?
❑
❑
M
❑
Is the scouring acceptable?
0
❑
❑
❑
Is the clear well free of excessive solids and filter media?
0
❑
❑
❑
Comment: All four disc filter trains were operational: however. two trains are typically in service.
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ M ❑
Comment: The flow meters (influent and effluent) are calibrated Quarterly and were last calibrated on
10/19/17 by CTS. Inc.
Disinfection - UV
Are extra UV bulbs available on site?
Are UV bulbs clean?
Is UV intensity adequate?
Is transmittance at or above designed level?
Is there a backup system on site?
Is effluent clear and free of solids?
Comment:
Effluent Pipe
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly?
Yes No NA NE
■ ❑ ❑ ❑
■ ❑ ❑ ❑
❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
❑ ❑ ❑
Yes No NA NE
■
❑
❑
❑
■
❑
❑
❑
❑
❑
■
❑
Comment: The effluent appeared clear with no floatable solids or foam. The receiving stream did not
appear to be negatively impacted.
Aerobic Digester
Is the capacity adequate?
Yes No NA NE
■ ❑ ❑ ❑
Page# 8

Permit: NCO046728 Owner - Facility: Rocky River WWTP
Inspection Date: 11109/2017 Inspection Type: Compliance Evaluation
Aerobic Digester
Yes No NA NE
Is the mixing adequate?
M
❑
❑
❑
Is the site free of excessive foaming in the tank?
,Lj,
❑
❑
❑
# Is the odor acceptable?
■
❑
❑
❑
# Is tankage available for properly waste sludge?
❑
❑
❑
Comment: Both aerobic di c esters were operational and in service.
Solids Handlin-cl Equipment
Yes No NA NE
Is the equipment operational?
0❑
❑
❑
Is the chemical feed equipment operational?
■
❑
❑
❑
Is storage adequate?
0
❑
❑
❑
Is the site free of high level of solids in filtrate from filter presses or vacuum filters?
❑
❑
❑
Is the site free of sludge buildup on belts and/or rollers of filter press?
❑
❑
❑
Is the site free of excessive moisture in belt filter press sludge cake?
❑
❑
❑
The facility has an approved sludge management plan?
❑
❑
❑
Comment: The belt press and dryer system were operational and in service. The facilitv produces a
Class A residual that is currently being distributed to the Rowan Research Farm Rowan
County) and a private farm dredell County] under the authority of Permit No. WQ0O36723.
The facility is also -permitted for the land application of bio-solids Class B residuals under
the authority of Permit No. W0OO14136.
Standby Power
Yes No NA NE
Is automatically activated standby power available?
M
❑
130
Is the generator tested by interrupting primary power source?
❑
❑
❑
Is the generator tested under load?
❑
❑
❑
Was generator tested & operational during the inspection?
❑
❑
❑
Do the generator(s) have adequate capacity to operate the entire wastewater site?
W
❑
❑
❑
Is there an emergency agreement with a fuel vendor for extended run on back-up power?
❑
❑
❑
Is the generator fuel level monitored?
❑
❑
❑
Comment: The facility is equipped with four standby generators 3 — WWTP and 1 —wet weather E_Q
tanks that are periodically tested and serviced Cummin s . The facility also participates in
the load management program.
Page# 9

NH3/TRC WLA Calculations
Facility: Rocky River WWTP
PermitNo. NCO046728
Prepared By: Min Xiao
Enter Design Flow (MGD): 7.5
Enter s7Q10 (cfs): 0.5
Enter w7Q10 (cfs): 0.9
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
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/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
95.88
IWC (%)
95.88
Allowable Conc. (ug/1)
18
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
0.9
Monthly Average Limit:
200/100ml 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/1)
0.22
IWC (%)
92.81
Allowable Conc. (mg/1)
1.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/l to protect for acute toxicity
Ammonia [as NH3-N,
1. If Allowable Conc > 35 mg/l, 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 C_oliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

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awed

Permit No. NCO036277
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 ality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/l
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/l
(Dissolved)
Chronic SW, µg/l
(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
213.0200 (e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
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/1
Cadmium, Acute
WER*{1.136672-[In hardness](0.041838)) - e^{0.9151 [In hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[In hardness](0.041838)} • e^{0.9151[ln hardness] -3.623 6}
Cadmium, Chronic
WER*{1.101672-[In hardness](0.041838)} • e^{0.7998[ln hardness] -4.445 1}
Chromium III, Acute
WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 a^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 a^{0.9422[ln hardness] -1.700}
Copper, Chronic
WER*0.960 a^{0.8545[ln 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 a^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 a^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No. NCO036277
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic Not applicable
Zinc, Acute 1 WER*0.978 • e^{0.8473[ln hardness]+0.884}
Zinc, Chronic I WER*0.986 • e^{0.8473[ln hardness]+0.884)
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved 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 permit'limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
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 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, 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. NCO036277
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,. UE}stream 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:
Cdiss = 1
Ctotal 1 + { [Kpo] [ssci+e'] [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 + w) (Cwgs)(s7010) (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 s7Q 10)
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:
1 Q 10 = 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
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.
The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. 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)]
7Q 10 summer (cfs)
1.80
BIMS
1 Q 10 (cfs)
1.51
Calculated from 7Q10
Permitted Flow (MGD)
12.0
BIMS
Date: 6/24/2019
Permit Writer: Min Xiao
Page 4 of 4

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NPDES/A uifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
PERMIT WRITERS - AFTER you get this form
Check all that apply back from PERCS:
Date of Request 7/22/2019
municipal renewal X - Notify PERCS if LTMP/STMP data we said should
Reg uestor Min Xiao
new industries be on DMRs is not really there, so we can get it for
Facility Name Rocky River WWTP
you (or NOV POTW).
WWTP expansion - Notify PERCS if you want us to keep a specific
Permit Number NCO046728
Speculative limits POC in LTMP/STMP so you will have data for next
Region- Mooresville
stream reclass. permit renewal.
Basin Yadkin -Pee Dee
outfall relocation - Email PERCS draft permit, fact sheet, RPA.
7Q10 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 Zho 807-6310
-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 SIUs 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
Actual
Time period for Actual
STMP time frame:
Industrial
CMost
recent:
Uncontrollable
n/a
NextCycle:
a
n
Parameter of
POC due to
NPDESI Non-
Required by
Required
POC due
POTW POC
STMP
LTMP
cp
Concern POC )
Disch Permit
EPA*
by 503
to SIU'**
(Plain
Effluent
Effluent
g
Check List
Limit
Sludge**
below)—
Freq
Freq
IQ= Quarterly
M = Monthly
BOD
4
CAM
TSS
V
4
Q M
H3
4
Q M
Arsenic
4
Q M
Cadmium
d
t/
4
Q M
Chromium
4
Q M
o per
4
Q M
Cyanide
4
Q M
Is all data on DMRs?
Lead
4
Q M
YES _
NO attach data)'
Mercury
4
Q M
Molybdenum
4
Q M
Nickel
4
Q M
'aver
4
Q M
Selenium
4
Q M
Zinc
4
Q M
Is data in spreadsheet?
Total Nitrogen
4
Q M
YES email 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 tax., explanation of any
POCs: info you have on IU related investigations into NPDES problems):
L_ —
_
Rocky River WWTP - PERC NPDES_Pretreatmentrequestform.xlsx
Revised: July 24, 2007