NC0021121_Permit Issuance_20140718

NPDES DOCUMENT SCANNING: COVER SHEET
NPDES Permit:
NC0021121
Mount Airy WWTP
Document Type: -'
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 18, 2014
This document is printed dark reuse paper - ignore any
corktent on the rezzerse side

ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
July 18, 2014
Mr. Chris Marion
City of Mount Airy
PO Box 70
Mount Airy, North Carolina 27030
Subject Final NPDES Permit
Permit NC0021121
Mt. Airy WWTP
Surry County
Class N Facility
Dear Mr. Marion:
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).
The final permit contains the following changes from your previous permit:
• As requested by the City instream monitoring for conductivity was eliminated from the monitoring
requirements in your permit. The requirement to monitor for conductivity was based on the large
contribution of industrial flow to the WWIP which is no longer the case.
• Based on the results of a reasonable potential analysis monitoring for cyanide, cadmium, chromium,
lead, and mercury were eliminated from the permit.
• Monitoring frequencies for chloride, copper, zinc and silver were modified to quarterly according to
Division's policy on monitoring frequency for metals.
• A special condition was added to the draft permit to address the Environmental Protection Agency's
(EPA's) pending requirement for you to provide electronically -submitted Discharge Monitoring
Reports (eDMRs). The Division intends to fully implement the eDMR program as soon as
practicable. See Condition A.(4.) in permit. For information on eDMR, registering for eDMR and
obtaining an eDMR user account, please visit the following web page:
http: / /portal.ncdenr.org/web /wq/admin/bog/ipu/edmr.
1601 Mail Service Center, Raleigh, North Carolina 27699-1601
Phone: [phone] l Internet: www.ncdenr,gov
An Equal opportunity 1 Afrrmative Action Employer — Made In part by recycled paper

Mr. Chris Marion
July 18, 2014
Page 2 of 2
For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the following
web site:
http: / /www2.epa.gov/compliance/proposed-npdes-electronic-reporting-rule.
• In accordance with the 2012 Statewide Mercury TMDL the requirement to develop a Mercury
Minimization Plan was added to the permit. See Condition A.(5.). Please note that the MMP shall be
developed within 180 days of the NPDES permit effective date. A sample plan has been placed on
the Division website for guidance (http://portal.ncdenr.org/web/wq/swp/ps/npdes
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 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 permits
required by the Division of Land Resources, the Coastal Area Management Act or any other federal or local
governmental permits that may be required.
If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone
number [phone] or at email [e-mail].
Sincerely, .
Thomas A. Reeder, Director
/Division of Water Resources, NCDENR
cc: NPDES Files
Central files
EPA Region 4 (e-copy)
Winston-Salem Regional Office / Surface Water Protection Section
Aquatic Toxicology Branch (e-copy)
Ecosystems Branch (e-copy)

4
Permit NC0021121
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision 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, the
City of Mount Airy
is hereby authorized to discharge wastewater from a facility located at the
Mount Airy WWTP
1750 Andy Griffith Parkway
Mount Airy
Surry County
to receiving waters designated as the Ararat River 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 September 1, 2014.
This permit and authorization to discharge shall expire at midnight on February 28, 2019.
Signed this day July 18, 2014
somas A. Reeder, Director
1 Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9

Permit NC0021121
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
The City of Mount Airy is hereby authorized to:
1. Continue • to operate an existing 7.0 MGD wastewater treatment facility that
includes the following components:
> Mechanical bar screening
> Grit chamber
> Primary clarifiers
> Trickling filters
> Activated sludge tank
> Secondary clarifiers
> Belt press
> Sludge thickener
> Chlorine contact tank
> Dechlorination
> Anaerobic digester
> Continuous recording flow meter
This facility is located at 1750 Andy Griffith Parkway South, Mount Airy in Surry
County.
2. Discharge from said treatment works at the location specified on the attached map
into the Ararat River, currently classified C waters in the Yadkin -Pee Dee River
Basin.
Page 2 of 9

Permit NC0021121
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
PARAMETER
LIMITS .
MONITORING REQUIREMENTS
Monthly
Average ;
Weekly
Average
Daily
Maximum.
Measurement
Frequency ,
Sample
Type
Sample
Location1
Flow
7.0 MGD
Continuous
Recording
I or E
BOD5 2
30.0 mg/L
45.0 mg/L
Daily
Composite
I or E
Total Suspended Solids (TSS)2
30.0 mg/L
45.0 mg/L
Daily
Composite
I or E
NH3-N (April 1- October 31)
13.0 mg/L
35.0 mg/L
3lweek
Composite
E
NH3-N (November 1- March 31)
3/week
Composite
E
Dissolved Oxygen (April 1- October
31)
Daily average > 5.0 mg/L
Daily
Grab
E,U,D
Dissolved Oxygen (November 1-
March 31)
Daily
Grab
E,U,D
Fecal Coliform
200/100 mL
400/100 mL
Daily
Grab
E
pH
> 6.0 and < 9.0 standard units
Daily
Grab
E
Total Residual Chlorine (TRC)3
28 pg/L
Daily
Grab
E
Temperature
Daily
Grab
E,U,D
Total Nitrogen
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Conductivity
Weekly
Grab
E
Oil and Grease
Quarterly
Grab
E
Total Copper
Quarterly
Composite
E
Total Zinc
Quarterly
Composite
E
Total Silver
Quarterly
Composite
. E
Chloride
Quarterly
Composite
E
Chronic Toxicity4
Quarterly
Composite
E
Notes:
1 E: Effluent, I: Influent, U: upstream at Highway 52, D: downstream (1) approximately 1.0 mile below
the discharge before the confluence with Stewarts Creek and (2) approximately 6.0 miles below the
discharge before the confluence with Caddie Creek. Instream samples shall be grab samples collected
3/week during June, July, August, and September and once per week during the remaining months of
the year. Instream monitoring is provisionally waived in light of the permittee's participation
in the Yadkin- Pee Dee River Basin Association. Instream monitoring will be immediately
reinstated should the permittee end its participation in the Association.
2 The monthly average BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
3 The facility shall report all effluent TRC values reported by a NC certified laboratory including field certified.
However, effluent values below 50 µg/L will be treated as zero for compliance purposes.
4 Chronic Toxicity (Ceriodaphnia) P/F ® 42%; January, April, July, October [see A (3)]. Quarterly toxicity
sampling shall be conducted at the same time as metals sampling.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 3 of 9

Permit NC0021121
A. (2) EFFLUENT POLLUTANT SCAN
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: 2015, 2016, and 2017. Analytical
methods shall be in accordance with 40 CFR Part 136 and shall be siifficiently 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)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury (EPA Method 1631E)
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane •
2-chloroethylvinyl ether
Chloroform
Dichlorobromomethane
1,1-dichloroethane
1,2-dichloroethane
Trans-1,2-dichloroethylene
1,1-dichloroethylene
1,2-dichloropropane
1,3-dichloropropylene
Ethylbenzene
Methyl bromide
Methyl chloride
Methylene chloride
1,1, 2, 2-ttrachloroethane
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4,6-dinitro-o-cresol
2,4-dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2, 4, 6-trichlorophenol
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy) methane
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a,h)anthracene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1, 2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
I nd a no (1, 2, 3 - cd) p yre ne
Isophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
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
Page 4 of 9

Permit NC0021121
the following address: NC DENR / 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 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. (3) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 42%.
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 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
Page 5 of 9

Permit NC0021121
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be fled 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 chemicallphysical 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.
A. (4) MERCURY MINIMIZATION PLAN
The permittee will develop and implement a mercury minimization plan during the term of this permit.
The MMP shall be developed 180 days from the effective day of the permit, and shall be available for
inspection on -site. A sample MMP was developed through a stakeholder review process and has been places
on the Division website for guidance (http://portal.ncdenr.org/web/wq/swp/ps/npdes, under Mercury
Minimization Plan). The MMP should place emphasis on identification of mercury contributors and goals
for reduction. Results shall be summarized and submitted with the next permit renewal.
A. (5) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and specify that, if a state does not establish a system to receive such submittals, then
permittees must submit DMRs electronically to the Environmental Protection Agency (EPA). The
Division anticipates that these regulations will be adopted and is beginning implementation in late
2013.
Page 6 of 9

Permit NC0021121
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit (Standard Conditions for NPDES Permits):
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)1
Beginning no later than 270 days from the effective date of this permit, the permittee shall
begin reporting 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 DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,
1.1; 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be
submitted to the mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements 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 using eDMR. Temporary waivers
shall be valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be
submitted electronically to the Division unless the permittee re -applies for and is granted a
new temporary waiver by the Division.
Information on eDMR and application for a temporary waiver from the NPDES electronic
reporting requirements is found on the following web page:
http://portal.ncdenr.ora/web/wq/admin/bog/ipu/edznr
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.
Page 7 of 9

Permit NC0021121
2. 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://portal.ncdenr.org/web/wci/admin/bog/ipu/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."
3. Records Retention [Supplements Section D. (6.)1
Thepermittee 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].
A. (6.) NUTRIENT REOPENER FOR HIGH ROCK LAKE
This permit may be reopened and modified to implement nutrient requirements in accordance with
any future TMDL and/or nutrient management strategy for High Rock Lake.
Page 8 of 9

Latitude: 36°28'10" Sub -Basin:
Longitude: 80°36'00" County:
Quad #: B16NE/Mt Airy South
Stream Class: C
Receiving Stream: Ararat River
Page 9 of 9
Permit NC0021121

l'°41efria&tir-t (Z-eA-torke
DENR/DWR
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0021121
Facility Information
Applicant/Facility Name:
City of Mount Airy/Mount Airy WWTP
Applicant Address:
PO Box 70, Mt Airy, NC 27030
Facility Address:
1750 Andy Griffith Pkwy, Mt Airy, NC 27030
Permitted Flow
7.0 MGD
Type of Waste:
Domestic 98%/Industrial 2%
Facility/Permit Status:
Class IV
County:
Surry
Miscellaneous
Receiving Stream:
Ararat River
Regional Office:
Winston-Salem
Stream Classification:
C
State Grid / USGS Quad:
B16NE
303(d) Listed?
No
Permit Writer:
Teresa Rodriguez
HUG
03040101
Date:
5/19/14
Sub -basin
03-07-03
Lat. 36° 28' 10" N Long. 80° 36' 00" W
Drainage Area (mi2):
75.2�
Summer 7Q10 (cfs)
14.9
Winter 7Q10 (cfs)
31
Average Flow (cfs):
90
IWC (%):
42
SUMMARY
This facility is a major municipal treatment plant operating in Surry County that serves the City of Mount
Airy and one non -significant industrial user. The facility has permitted flow of 7.0 MGD discharging into the
Ararat River. Facility is a member of the Yadkin -Pee Dee Monitoring Coalition, and all their instream
monitoring is conditionally waived for the duration of their membership in the Coalition. The City has 1
significant industrial user and a. full-scale pretreatment program. The permit will continue to require the City
to implement its pretreatment program.
RECEIVING STREAM
This facility discharges to the Ararat River in the Yadkin Pee Dee River Basin, classified C waters. Ararat
River is not listed in the NC 2012 303(d) list.
DMR REVIEW AND VERIFICATION OF EXISTING CONDITIONS
DMR were reviewed for the period of January 2009 to March 2014. Data are summarized in Table 1.
Table 1. Data Summ
Parameter
Units
Average
Max
Min
Flow
MGD
1.9
8.98
0.73
BOD
mg/1
3.5
60
< 2
NH3N
mg/1-
0.25
18.4
< 0.1
TSS
mg/1
4.2
56
< 1
pH
SU
7.2
7.7
6
Temperature
°C
17.4
27.2
2
TRC
12g/1
12.8
27
1
TN
mg/1
12.4
22.3
0.65
TP
mg/1
2.6
17.8
0.6
Fecal Coliform
#/100 ml
4.7
> 12000
< 1
Fact Sheet
NPDES NC0030210 Permit Renewal
Page 1

Dissolved Oxygen
mg/1
9.5
20.6
5.6
Oil & Grease
mg/1
5
5.6
<5
The facility reported one violation for the weekly fecal coliform limit in 2010 and one for the mercury daily
maximum limit in 2009.
Mercury Evaluation
A mercury evaluation was conducted in accordance with the Permitting Guidance developed for the
implementation of the statewide Mercury TMDL to determine the need for a limit and Mercury Minimization
Plan (MMP). Based on dilution the water quality based effluent limitation (WQBEL) for mercury is 28.5 ng/l.
The technology based effluent limit (IBEL) is 47 ng/1. A reasonable potential analysis was performed with
recent data. There is not reasonable potential to exceed the mercury limit, therefore the limit and monitoring
can be removed from the effluent monitoring requirements. The facility had detections above 1 ng/1 over the
past five years, therefore a Mercury Minimization Plan will be required in the permit. A condition will be
added to the permit describing the requirements for the MMP.
Table 2. Mercunr Evaluation
2009
2010
2011
2012
2013
Mercury Annual Average (ng/1)
7.2
5.3
6.8
3.6
3.2
Mercury Annual Max (ng/L)
34.5
21.5
25.1
10.5
23.7
Reasonable Potential Analysis
A Reasonable Potential Analysis (RPA) was completed for cadmium, chloride, chromium, copper, cyanide,
lead, mercury, silver, and zinc. The attached RPA spreadsheet summaries the results of the analyses.
Instream Monitoring
The permit requires instream monitoring at one upstream location and two downstream locations. The
permittee is a member of the Yadkin -Pee Dee River Basin Association.
Priority Pollutant Analysis:
The application includes the results of three priority pollutant analyses. The only parameter detected was
chloroform at levels below the water quality criteria.
Aquatic Toxicity Testing:
Permit requires chronic toxicity, ceriodaphnia dubia, 42 %. The facility consistently passed all the toxicity tests.
LIMITS AND MONITORING REQUIREMENTS:
Current conditions, as well as the basis for the limits are summarized in Table 3.
Table 3. Current Conditions and Pr000scd Changes
Parameters Affected
Change from Previous
Permit
Basis for Condition/Change
Flow
No changes
T15A 2B .0505
BOD5
No changes
Secondary treatment standards/40 CFR 133
/ T15A 2B .0406
NH3-N
No changes
Protection of aquatic toxicity
TSS
No changes
Secondary treatment standards/40 CFR 133
/ T15A 2B .0406
Fecal coliform, DO, pH
No changes
State WQ standards, T15A 2B .0200
Total residual chlorine
No changes
State WQ standards, T15A 2B .0200
Total Nitrogen/Total
Phosphorus
No changes
T15A 02B .0508
Cyanide, Total Cadmium,
Total Chromium, Total
Lead, Mercury
Eliminate monitoring
No reasonable potential to exceed the water
quality standards
Fact Sheet
NPDES NC0030210 Permit Renewal
Page 2

Mercury
Cyanide, Total Copper,
Total Silver, Total Zinc
Modify monitoring
frequency to Quarterly
Division policy on monitoring frequency for
metals
SUMMARY OF PROPOSED CHANGES:
1. Based on the results of the RPA monitoring for cyanide, cadmium, chromium, lead, and mercury
were eliminated from the permit monitoring requirements.
2. Special condition was added with requirements for a Mercury Minimization Plan.
3. A special condition was added describing requirements for electronic reporting of DMRs.
4. Monitoring frequency for copper, chloride, silver and zinc was modified to quarterly.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
NPDES DIVISION CONTACT
May 22, 2014
July 14, 2014
If you have questions regarding any of the above information or on the attached permit, please contact
Teresa Rodriguez at 919-807-6387.
NAME: !/L1( , DATE:
REGIONAL OFFICE COMMENTS
6//
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
NPDES NC0030210 Permit Renewal
Page 3

Mount Airy
NC0021121
2014 Freshwater RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
Qw (MGD) = 7.00
1Q1OS (cfs)= 12.33
7Q1OS (cfs) = 14.90
7Q 1 OW (cfs) = 31.00
30Q2 (cfs) = NO 30Q2 DATA
Avg. Stream Flow, QA (cfs) = 90.00
Receiving Stream: Ararat River
WWTP/WTP Class: IV
IWC ® 1Q1OS = 46.807593%
IWC ® 7Q1OS = 42.135922%
1WC Q 7Q 1 OW = 26.925926%
IWC 30Q2 = N/A
IWC ® QA = 10.758562%
Stream Class: C
Outfa11001
Qw=7MGD .
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
-I
a
N
N
z
'
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
'h FAV /
Acute
n
# Det. Max Pred
Allowable Cw
Cw
Cadmium
•
NC
2
FW(7Q10s)
15
ug/L
58
2
2.0
Acute: 32.0
__ _ __-_-__ _--_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 4.7
No value > Allowable Cw
No RP, eliminate monitoring
Chlorides(AL) •
NC
230
FW(7Q10s)
mg/L
58
58
474
Acute: NO WQS
__ _ __-_-__ __---_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 546
No value > Allowable Cw
ALS, monitor quarterly
Chromium
NC
50
FW(7Q10s)
1022
ug/L
58
3
5.0
Acute: 2,183.4
___ _ __-_-__ __-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 118.7
No value > Allowable Cw
No RP, eliminate monitoring
Copper(AL)
NC
7
FW(7Q10s)
7.3
ug/L
58
57
69.0
Acute: 15.6
___ _ __-_-_ ____-_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 16.6
40 value(s) > Allowable Cw
RP, ALS quarterly monitoring
Cyanide
NC
5
FW(7Q10s)
22
10
ug/L
58
2
10.0 •
Acute: 47.0
__-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 11.9
No value > Allowable Cw
No RP
Lead
NC
25
FW(7QIOs)
33.8
ug/L
58
2
10.0
Acute: 72.2
-- _ _ _ ----- _ _ ------------------------------
Chronic: 59.3
No value > Allowable Cw
No RP, eliminate monitoring
Mercury
NC
12
FW(7Q10s)
0.5
ng/L
58
57
23.7
Acute: NO WQS
___ _ __-_-__ __---_-_-_-_-_-_-_-_-_-_-_-_-_-
Chronic: 28.5
No value > Allowable Cw
No RP, eliminate monitoring
Silver (AL)
NC
0.06
FW(7Q10s)
1.23
ug/L
58
3
5.000
Acute: 2.628
_ _ _ -----_ _
-- ------------------------------
Chronic:0.142
58 value(s) > Allowable Cw
RP, ALS quarterly monitoring
Zinc (AL)
NC
50
FW(7Q10s)
67
ug/L
58
58
152.0
Acute: 143.1
--_ _ _ Chronic:-----_ _---------------
118.7---------------
3 value(s)> Allowable Cw
RP, ALS quarterly monitoring
Page 1 of 1
21121 RPA 2014.xlsx, rpa
5/15/2014

REASONABLE POTENTIAL ANALYSIS
4
Use "PASTE SPECIAL
Cadmium Values" then "COPY"
. Maximum data
5
Chlorides (AL)
points = 88
Date Data BDL=1/2DL Results
1 < 2 1 Std Dev. 0.1841 1
2 < 2 1 Mean 1.0345 2
3 < 2 1 C.V. 0.1779 3
4 < 2 1 n 58 4
5 < 2 1 5
6 < 2 1 Mult Factor = 1.00 6
7 < 2 1 Max. Value 2.0 ug/L 7
8 < 2 1 Max. Pred Cw 2.0 ug/L 8
9 < 2 1 9
10 < 2 1 10
11 < 2 1 11
12 < 2 1 12
13 < 2 1 13
14 < 2 1 14
15 < 2 1 15
16 < 2 1 16
17 < 2 1 17
18 < 2 1 18
19 < 2 1 19
20 < 2 1 20
21 < 2 1 21
22 < 2 1 22
23 < 2 1 23
24 < 2 1 24
25 < 2 1 25
26 < 2 1 26
27 < 2 1 27
28 < 2 1 28
29 < 2 1 29
30 < 2 1 30
31 < 2 1 31
32 < 2 1 32
33 < 2 1 33
34 < 2 1 34
35 < 2 1 35
36 < 2 1 36
37 < 2 1 37
38 < 2 1 38
39 < 2 1 39
40 < 2 1 40
41 < 2 1 41
42 < 2 1 42
43 < 2 1 43
44 < 2 1 44
45 < 2 1 45
46 < 2 1 46
47 < 2 1 47
48 < 2 1 48
49 < 2 1 49
50 < 2 1 50
51 < 2 1 51
52 2 2 52
53 2 2 53
54 < 2 1 54
55 < 2 1 55
56 < 2 1 56
57 < 2 1 57
58 < 2 1 58
Date Data
BDL=1/2DL Results
47.3 47.3 Std Dev.
47.8 47.8 Mean
42 42 C.V.
40.4 40.4 n
42 42
38.3 38.3 Mutt Factor =
42 42 Max. Value
42.5 42.5 Max. Pred Cw
42 42
44.5 44.5
35.5 35.5
42 42
45 45
31 31
32.5 32.5
42 42
42 42
91 91
48.6 48.6
47.5 47.5
44.7 44.7
43.2 43.2
42.2 42.2
474.4 474.4
47 47
54.5 54.5
47.5 47.5
42 42
40 40
38 38
32 32
44 44
38.9 38.9
37 37
45.9 45.9
39.5 39.5
43.5 43.5
39.1 39.1
44.8 44.8
41.7 41.7
30.6 30.6
28.8 28.8
44.6 44.6
42.2 42.2
59.4 59.4
45 45
47.7 47.7
51.9 51.9
51.4 51.4
51.5 51.5
45.4 45.4
37.9 37.9
44.9 44.9
54.3 54.3
64.6 64.6
76.7 76.7
40.2 40.2
42.3 42.3
Use"PASTE SPECIAL -
Values" Ihen "COPY".
Maximum data points =
58
8
Chromium
Date Data BDL=1/2DL Results
Use "PASTE SPECIAL.
Values" then "copy-
. s!axlmum data
points =S3
57.2871 1 < 5 2.5 Std Dev. 0.5585
52.2 2 < 5 2.5 Mean 2.6293
1.0983 3 < 5 2.5 C.V. 0.2124
58 4 < 5 2.5 n 58
5 < 5 2.5
1.0 6 < 5 2.5 Mult Factor =
474.4 mg/L 7 < 5 2.5 Max. Value
474.4 mg/L 8 < 5 2.5 Max. Pred Cw
9 < 5 2.5
10 < 5 2.5
11 < 5 2.5
12 < 5 2.5
13 < 5 2.5
14 < 5 2.5
15 < 5 2.5
16 < 5 2.5
17 < 5 2.5
18 5 5
19 < 5 2.5
20 < 5 2.5
21 < 5 2.5
22 < 5 2.5
23 < 5 2.5
24 < 5 2.5
25 < 5 2.5
26 < 5 2.5
27 < 5 2.5
28 < 5 2.5
29 < 5 2.5
30 < 5 2.5
31 < 5 2.5
32 < 5 2.5
33 < 5 2.5
34 < 5 2.5
35 < 5 2.5
36 < 5 2.5
37 < 5 2.5
38 < 5 2.5
39 < 5 2.5
40 < 5 2.5
41 < 5 2.5
42 < 5 2.5
43 < 5 2.5
44 < 5 2.5
45 5 5
46 5 5
47 < 5 2.5
48 < 5 2.5
49 < 5 2.5
50 < 5 2.5
51 < 5 2.5
52 < 5 2.5
53 < 5 2.5
54 < 5 2.5
55 < 5 2.5
56 < 5 2.5
57 < 5 2.5
58 < 5 2.5
1.00
5.0 ug/L
5.0 ug/L
21121 RPA 2014.xisx, data
-1 - 5/7/2014

REASONABLE POTENTIAL ANALYSIS
Copper (AL)
Date Data BDL=112DL Results
45 45 Std Dev.
26 26 Mean
32 32 C.V.
24 24 n
19 19
19 19 Mult Factor =
24 24 Max. Value
48 48 Max. Pred Cw
48 48
28 28
16 16
18 18
30 30
17 17
30 30
31 31
19 19
22 22
38 38
13 13
36 36
22 22
19 19
69 69
51 51
29 29
5 2.5
16 16
13 13
16 16
14 14
39 39
12 12
29 29
14 14
6 6
6 6
16 16
15 15
36 36
10 10
44 44
15 15
13 13
18 18
17 17
11 11
20 20
38 38
22 22
13 13
40 40
17 17
60 60
34 34
41 41
22 22
23 23
Use"PASTE SPECIAL -
Values" then "COPY"
. Maximum data
points = 53
10
Cyanide
13.7828
25.2672
0.5455
58
1.00
69.0 ug/L
69.0 ug/L
Date Data BDL=1/2DL Results
1 < 10 5 Std Dev.
2 10 5 Mean
3 10 5 C.V.
4 10 5 n
5 10 5
6 10 5 Mult Factor =
7 10 5 Max. Value
8 5 5 Max. Pred Cw
9 10 5
10 10 5
11 10 5
12 < 10 5
13 < 10 5
14 < 10 5
15 < 10 5
16 < 10 5
17 < 10 5
18 < 10 5
19 < 10 5
20 < 10 5
21 < 10 5
22 < 10 5
23 < 10 5
24 < 10 5
25 < 10 5
26 < 10 5
27 < 10 5
28 < 10 5
29 < 10 5
30 10 10
31 10 10
32 < 10 5
33 < 10 5
34 < 10 5
35 < 10 5
36 < 10 5
37 < 10 5
38 < 10 5
39 < 10 5
40 < 10 5
41 < 10 5
42 < 10 5
43 < 10 5
44 < 10 5
45 < 10 5
46 < 10 5
47 < 10 5
48 < 10 5
49 < 10 5
50 < 10 5
51 < 10 5
52 < 5 5
53 < 5 5
54 < 10 5
55 < 5 5
56 < 5 5
57 < 10 5
58 < 10 5
Use "PASTE SPECIAL,,
,Values" then "COPY"
. Maximum data
points = 58
12
Lead
0.9203
5.17
0.1779
58
1.00
10.0 ug/L
10.0 ug/L
Date Data BDL=1/2DL Results
1 < 10 5 Std Dev.
2 < 10 5 Mean
3 < 10 5 C.V.
4 < 10 5 n
5 < 10 5
6 < 10 5 Mull Factor=
.7 < 10 5 Max. Value
8 < 10 5 Max. Pred Cw
9 < 10 5
10 < 10 5
11 < 10 5
12 < 10 5
13 < 10 5
14 < 10 5
15 < 10 5
16 < 10 5
17 < 2 1
18 < 2 1
19 < 10 5
20 < 10 5
21 < 10 5
22 < 10 5
23 < 10 5
24 < 5 2.5
25 < 10 5
26 < 10 5
27 < 10 5
28 < 10 5
29 < 10 5
30 < 10 5
31 < 10 5
32 < 10 5
33 < 10 5
34 < 10 5
35 10 10
36 10 10
37 < 10 5
38 < 10 5
39 < 10 5
40 < 10 5
41 < 10 5
42 < 10 5
43 < 10 5
44 < 10 5
45 < 5 2.5
46 < 10 5
47 < 10 5
48 < 10 5
49 < 10 5
50 < 10 5
51 < 10 5
52 < 10 5
53 < 10 5
54 < 10 5
55 < 10 5
56 < 10 5
57 < 10 5
58 < 10 5
Use "PASTE SPECIAL.
-Values" then "COPY"
. Maximum data
points = 58
13
Date Da
1.2865
4.9483
0.2600
58
1.00
10.0 ug/L
10.0 ug/L
-2-
21121 RPA 2014.xlsx, data
5/7/2014

REASONABLE POTENTIAL ANALYSIS
Mercury
to BDL=1/2DL Results
1.5 1.5 Std Dev.
1 1 Mean
2.1 2.1 C.V.
1.5 1.5 n
0.5 0.5
1.6 1.6 Mull Factor =
2.5 2.5 Max. Value
1.2 1.2 Max. Pred Cw
1.1 1.1
1 1
1.4 1.4
1.9 1.9
0.5 0.25
1.3 1.3
0.7 0.7
0.6 0.6
2.4 2.4
1.3 1.3
12.8 12.8
3.9 3.9
4.4 4.4
0.7 0.7
3.5 3.5
6.3 6.3
1.7 1.7
1.4 1.4
1.9 1.9
6.5 6.5
4 4
1.7 1.7
3.1 3.1
3.1 3.1
1.3 1.3
23.7 23.7
7.1 7.1
5.2 5.2
10 10
3.2 3.2
10,8 10.8
1.4 1.4
2.5 2.5
2.7 2.7
1.1 1.1
1.7 1.7
3.5 3.5
1.8 1.8
2.4 2.4
1.7 1.7
19 19
7.2 7.2
4.2 4.2
2.4 2.4
2.6 2.6
4.8 4.8
3.7 3.7
3.2 3.2
1.3 1.3
4.9 4.9
Use "PASTE SPECIAL•
Values" then "COPY'
. Maximum data
points = 58
17
Silver (AL)
4.2474
3.6595
1.1607
58
1.00
23.7 ng/L
23.7 ng/L
Date Data BDL=112DL Results
1 5 5 Std Dev.
2 < 5 2.5 Mean
3 < 5 2.5 C.V.
4 < 5 2.5 n
5 < 5 2.5
6 < 5 2.5 Mult Factor =
7 < 5 2.5 Max. Value
8 < 5 2.5 Max. Pred Cw
9 < 5 2.5
10 < 5 2.5
11 < 5 2.5
12 < 5 2.5
13 < 5 2.5
14 5 2.5
15 < 5 2.5
16 < 5 2.5
17 < 5 2.5
18 < 5 2.5
19 < 5 2.5
20 < 5 2.5
21 < 5 2.5
22 < 5 2.5
23 5 2.5
24 5 2.5
25 5 2.5
26 5 2.5
27 5 2.5
28 < 5 2.5
29 < 5 2.5
30 < 5 2.5
31 5 2.5
32 5 2.5
33 < 5 2.5
34 < 5 2.5
35 < 5 2.5
36 < 5 2.5
37 5 5
38 5 5
39 < 5 2.5
40 < 5 2.5
41 < 5 2.5
42 < 5 2.5
43 < 5 2.5
44 < 5 2.5
45 < 5 2.5
46 < 5 2.5
47 < 5 2.5
48 < 5 2.5
49 < 5 2.5
50 < 5 2.5
51 < 5 2.5
52 < 5 2.5
53 < 5 2.5
54 < 5 2.5
55 < 5 2.5
56 < 5 2.5
57 < 5 2.5
58 < 5 2.5
Use "PASTE SPECIAL
Values" then "COPY'
. Maximum data
points = 88
18
Zinc (AL)
0.5565
2.6293
0.2124
58
1.00
5.000 ug/L
5.000 ug/L
Date Data BDL=1/2DL Results
1 82 82 Std Dev.
2 100 100 Mean
3 70 70 C.V.
4 56 56 n
5 73 73
6 122 122 Mult Factor =
7 113 113 Max. Value
8 84 84 Max. Pred Cw
9 98 98
10 95 95
11 65 65
12 62 82
13 53 53
14 39 39
15 46 46
16 66 66
17 47 47
18 68 68
19 97 97
20 104 104
21 85 85
22 135 135
23 68 68
24 94 94
25 60 60
26 68 68
27 80 80
28 94 94
29 42 42
30 104 104
31 46 46
32 86 86
33 84 84
34 68 68
35 52 52
36 103 103
37 83 83
38 83 83
39 88 88
40 89 89
41 20 20
42 152 152
43 52 52
44 90 90
45 63 63
46 65 65
47 88 88
48 65 65
49 62 62
50 55 55
51 36 36
52 71 71
53 40 40
54 45 45
55 74 74
56 47 47
57 70 70
58 92 92
Use "PASTE SPECIAL
Values" then "COPY'
. Maximum data
points = 68
25.1323
74.8103
0.3359
58
1,00
152.0 ug/L
152.0 ug/L
21121 RPA 2014.xlsx, data
- 3 - 5/7/2014

2014 Freshwater RPA - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
.0 ' REQUIRED DATA ENTRY
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQS
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
Data Source(s)
❑ CHECK TO APPLY MODEL
To appy Model lWC %:
Flow, Qw (MGD) entered
adjust 7Q10s (cfs) value
until chronic !WC
obtained. 1Q10s (cfs)
defined by program.
Mount Airy
Iv
NC0021121
001
7.000
Ararat River
c
14.90
31.00
90.00
rty
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
( Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Name
Type Chronic Modifier Acute
M
ce
ce
a.
PQL Units
Arsenic
C
50
FW
ug/LI
.
Arsenic
C
10
HH/WS
,:
:ug/L"'
Beryllium
NC
6.5
FW
1l'ug/L'
0
Cadmium
NC
2
FW
15
ug/L
•
Chlorides (AL)
NC
230
FW
mg/L
■
Chlorinated Phenolic Compounds
NC
1
A
ug/L.
■
Total Phenolic Compounds
NC
300
A
ug/L
■
Chromium
NC
50
FW
1,022
ug/L
■
Copper (AL)
NC
7
FW
7.3
ug/Lj
■
Cyanide
NC
5
FW
22
10
ug/L1
•
Fluoride
NC
1,800
FW
ug/L
■
Lead
NC
25
FW
33.8
ug/L'
■
Mercury
NC
12
FW
0.5
ng/L„
IN
Molybdenum
NC
2,000
HH
ug/Lj
■
Nickel
NC
88
FAN
261
ug/L ,'
■
Selenium
NC
5
FW
56
ug/Li
■
Silver (AL)
NC
0.06
FW
1.23
ug/Lt
•
Zinc (AL)
NC
50
FW
67
ug/L'
0
■
0
■
21121 RPA 2014.xlsx, input
5/7/2014

Rodriguez, Teresa
From: Marion, Chris <[e-mail]>
Sent: Monday, June 23, 2014 1:58 PM
To: Rodriguez, Teresa
Subject: Draft Permit #NC0021121
Good Afternoon Ms. Rodriguez,
I hope you are having a wonderful day. As we discussed in our telephone conversion last week, I have a concern with
one area of our draft permit. As with our current permit, the draft permit will require conductivity to be analyzed weekly
for our effluent, upstream, and two downstream sites and three times per week during the months of June, July, August,
and September. It is understood that instream monitoring shall be waived if we continue to participate in the Yadkin Pee
Dee River Basin Association. However if we choose not to participate in the Association, instream monitoring will be
immediately reinstated which could be a costly endeavor for the City. Either samples would need to be collected an
analyzed by a commercial laboratory or the City would need to purchase a meter and three different calibration standards
for in house monitoring. We perform in house monitoring for conductivity in the past and it did prove to be very costly.
Also in the past we encountered high effluent conductivity due to wastewater received from textile plants. In 2007, all
but one textile plant closed in the City. Our current effluent conductivity is between 350 and 550.
For these reasons, the City requests that the instream monitoring for conductivity be removed from the Final Permit.
Thank you for your help with this matter and I look forward to hearing from you.
Chris Marion
WWTP Supervisor
City of Mount Airy
336-786-3598
Please note that email sent to and from this address is subject to the North Carolina Public Records
Law and may be disclosed to third parties.
01-1<ect daAA ok etAer cthIcuid-7
1

NORTH CAROLINA
SURRY COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County and State, duly
commissioned, qualified and authorized by law to administer oaths,
personally appeared Ferris W. Simpson who being first duly
sworn, deposes and says: that he (she) is Business Manager
(Publisher or other officer or employee authorized to make affidavit) of
CIVITAS MEDIA, LLC, engaged in the publication of a newspaper known
as MOUNT AIRY NEWS, published, issued, and entered as periodicals
class mail in the city of Mount Airy in said County and State; that he (she)
is authorized to make this affidavit and sworn statement; that the notice or
other legal advertisement, a true copy of which is attached hereto, was
published in MOUNT AIRY NEWS on the following dates:
and that the said newspaper in which such notice, paper, document or
legal advertisement was published was, at the time of each and every
such publication, a newspaper meeting all of the requirements and
qualifications of Section 1-597 of the General Statutes of North Carolina
and was a qualified newspaper within the meaning of Section 1-597 of
the General Statutes of North Carolina.
This
day of ,2014
Signature of person making affidavit
Sworn to and subscribed before me, this C day of
2014
My Commission expires:
blic
January 15, 2018
BRiDGET HENDERSON
NOTARY PUBLIC
Yadkin County
North Carolina 15,2018
My Commission Expires January
Public Notice _
North Carolina Environmental
Management Commission/NP-
DES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of intent to issue a NP-
DES Wastewater Permit
The North Carolina Environ-
mental Management Commis-
sion proposes to issue a NP-
DES wastewater discharge
permit to the person(s) listed
below. Written comments re-
garding the proposed permit
will be accepted until 30 days
after the publish date of this
notice, The Director of the NC
Division of Water Resources
(DWR) may hold a public hear-
ing should there be a signific-
ant degree of public interest.
Please mail comments and/or
information requests to DWR
at the above address. Inter-
ested persons may visit the
DWR at 512 N. Salisbury
Street, Raleigh, NC to review
information on file. Additional
information on NPDES per-
mits and this notice may be
found on our website:
http://portainctienr.org/web/wq
/swp/ps/npdes/calendar, or by
calling [phone]. The
City of Mount Holly requested
renewal of permit NC0021121
for its WWTP in Surry County;
this facility discharge is treated
domestic wastewater to Ararat
River, Yadkin -Pee Dee River
Basin.
Publish: Mav 28.2014

City of Mt
Airy WWTP
November 4, 2013
Mr. Jim McKay
NC DENR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
P.O. Box 70
Mount Airy, N.C. 27030
Phone: [phone]
Fax: [phone]
Subject: Additional Information for NPDES Permit NC0021121 Renewal
Dear Mr. McKay,
The City of Mount Airy requested renewal of NPDES Permit NC0021121 on
August 20, 2013. The City forwarded an original renewal packet with two copies.
The packet included the information necessary to complete the renewal with the
exception of a fourth two species toxicity analysis. Enclosed are the results of the
analysis and additional information required for the permit renewal process.
Should you have questions or concerns. please contact me at 336-786-3597.
Sincerely,
7/44/0--)
Chris Marion
WWTP Supervisor/ORC
DENR-WATER QUALITY
POINT SOURCE BRANCH
idsoDo

/Qfkf7J Ape 1/DJ
City ofMt Aiiy WWTP
August 20, 2013
Mr. Charles H. Weaver
NC DENR/DWQ/NPDES
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Subject: NPDES Permit NC 0021121 Renewal
Dear Mr. Weaver,
P.O. Box 70
Mount Airy, N.C. 27030
Phone: [phone]
Fax: [phone]
The City of Mount Airy is requesting renewal of NPDES Permit NC 0021121 that
expires February 28, 2014. Enclosed please find the original renewal packet along
with two copies. The packet includes the application, supplemental application
information for part D and E, sludge management plan, and a copy of a letter from
our City Manager requesting that I be the duly authorized representative for the City
of Mount Airy Wastewater Treatment Plant. As you will notice, we still need to
complete an additional second species toxicity test which we have scheduled for
October along with our normal toxicity test. Once complete, I will forward the
necessary forms and results to you. If you have any questions or require further
information, please contact me at 336-786-3597.
Sincerely,
Chris Marion
WWTP ORC
AUN
3

min CITY OF MOUNT AIRY
P.O BOX 70
MOUNT AIRY, NC 27030
ram
Pug
1I
June 11, 2010
Mrs. Coleen H. Sullins
Division of Water Quality Director
DWQ-NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Delegation of Signatory Authority for the
City of Mount Airy WWTP
(NPDES Permit #NC00211121)
Surry County
Dear Mrs. Sullins,
In accordance with the City of Mount Airy's NPDES Permit #NC0021121 Part II, Section
B, Item 11, a,b,c, and d, the principal executive officer for the City may designate a duly
authorized representative to sign all applications, reports, or information submitted to the
Permit Issuing Authority. Therefore, I hereby designate the City's Operator in
Responsible Charge of the wastewater treatment plant with the authority to sign all
required documents. Currently, the Operator in Responsible Charge is Mr. Christopher S.
Marion.
Should you have any questions or should you need any additional information, please
contact me at [phone].
Cc: Charles Weaver — NPDES Unit
Gary Hudson - WSRO
Sincerely,
\ZevueuvLA4..
Barbara A. Jones
Interim City Manager
City of Mount Airy
or

WI
CITY OF MOUNT AIRY WASTEWATER TREATMENT PLANT
NARRATIVE OF THE SLUDGE MANAGEMENT PLAN
The City has two sludge holding tanks each one has a capacity of 650,000 gallons. The
sludge is held in the tanks from 30 to 60 days. The sludge is then pressed to achieve a
`m cake of approximately 20% solids. The solids are then hauled and disposed of in the
Surry County RCRA Sub -Title D lined landfill.

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CHLORINE
CONTACT
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SCHEMATIC