NC0021121_Permit Issuance_20040416

NPDES DOCUMENT SCANNING COVER :SHEET
NC0021121
Mount Airy WWTP
NPDES Permit:
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:
April 16, 2004
This document is printed on reuse paper - ignore any
content on the reYerse side

QG ©TA
NCDENR
Mr. Kent Scott
City of Mount Airy
P.O. Box 70
Mount Airy, North Carolina 27030
Dear Mr. Scott:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
April 16, 2004
Subject: Issuance of NPDES Permit NC0021121
Mount Airy WWTP
Surry Coutny
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge 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 May 9, 1994 (or as subsequently amended).
This final permit includes no major changes from the draft permit sent to you on December 17, 2003.
This permit includes a TRC limit that will take effect on November 1, 2005. If you wish to install
dechlorination equipment, the Division has promulgated a simplified approval process for such projects. Guidance
for approval of dechlorination projects is attached.
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 Quality or permits required by the Division of Land
Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may be
required. If you have any questions concerning this permit, please contact Sergei Chernikov at telephone number
[phone], extension 594.
cc: NPDES Unit ,
Winston-Salem Regional Office / Water Quality Section
Pretreatment Unit
Aquatic Toxicology Unit
DEI-I
Mr. Roosevelt Childress, EPA Region IV
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us
Sincerely,
Original Signed BY
A. GoodrM
Alan W. Klimek, P.E.
Phone: [phone]
fax: [phone]
DENR Customer Service Center. 1 800 623-7748

Permit No. NC0021121
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
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,
City of Mount Airy
is hereby authorized to discharge wastewater from a facility located at
Mount Airy Wastewater Treatment Plant
Off of US Highway 52
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 June 1, 2004.
This permit and authorization to discharge shall expire at midnight on February 28, 2009
Signed this day April 16, 2004.
Original Sign
Did A. Coodr°
Alan Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

a
P
Permit No. NC0021121
SUPPLEMENT TO PERMIT COVER SHEET
City of Mount Airy
is hereby authorized to:
1. Continue to operate an existing 7.0 MGD wastewater treatment facility
consisting of mechanical bar screening, grit chamber, primary clarifiers,
trickling filters, activated sludge tank, secondary clarifiers, belt press,
sludge thickener, chlorine contact tank, dechlorination, anaerobic digester,
and continuous recording flow meter, located at Mount Airy Wastewater
Treatment Plant, off of U. S. Highway 52, Mount Airy, Surry County, and
2. Discharge from said treatment works at the location specified on the
attached map into the Ararat River, which is classified C waters in the
Yadkin -Pee Dee River Basin.

NC0021121 - Mount Airy WWTP
USGS Quad: B16NE
Latitude: 36° 28' 10" N Permitted Flow: 7.0 MGD
Longitude: 80° 36' 00" W
Stream Class: C Sub -Basin: 03-07-03
Receiving Stream: Ararat River
North
Surry County

Permit No. NC0021121 .
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expansion, the Permittee is authorized to
discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICSMonthly
•
LIMITS
MONI1OtiusTO. REQUIREMENTS
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency : `
Sample
_ . Type
Sample Location'
Flow
7.0 MGD
Continuous
Recording
Influent or Effluent
BOD5 2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N
(April 1 - October 31)
13.0 mg/L
35.0 mg/L
3/week
Composite
Effluent
NH3 as N
(November 1 - March 31)
3/week
Composite
Effluent
Dissolved Oxygen3
Daily
Grab
Effluent
Dissolved Oxygen
Variable'
Grab
U & D
Fecal Coliform
200/100 mL
400/100 mL
Daily
Grab
Effluent
pH4
Daily
Grab
Effluent
Total Residual Chlorines
28 µg/L
Daily
Grab
Effluent
Temperature
Daily
Grab
Effluent
Temperature
Variable'
Grab
U & D
Total Nitrogen
Monthly
Composite
Effluent
Total Phosphorus
Monthly
Composite
Effluent
Conductivity
Weekly
Grab
Effluent
Conductivity
Variable'
Grab
U & D
Oil and Grease
Quarterly
Grab
Effluent
Total Chromium
2/month
Composite
Effluent
Total Lead
34 µg/L
Weekly
Composite
Effluent
`yanide6
12 µg/L
22 µg/L
Weekly
Grab
Effluent
Total Mercury
0.028 µg/L
Weekly
Grab
Effluent
Total Cadmium
4.7 µg/L
Weekly
Composite
Effluent
Total Copper
2/month
Composite
Effluent
Total Zinc
2/month
Composite
Effluent
Total Silver
2/month
Composite
Effluent
Chloride
2/month
Composite
Effluent
Chronic Toxicity?
Quarterly
Composite
Effluent
Notes:
1 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 Caddle Creek. Upstream
and downstream samples shall be grab samples and shall be collected three times per 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 Total Suspended Solids concentrations shall not exceed 15% of the respective influent
value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 Facility is allowed 18 month from the effective date of the permit to comply with the total residual chlorine limit.
This time period is allowed in order for the facility to budget and design/construct the dechlorination and /or
alternative disinfection systems.
6 The quantitation level for cyanide (CN) shall be 10 µg/L. CN levels reported as less than 10 µg/L shall be considered zero
for compliance purposes.
7 Chronic Toxicity (Ceriodaphnia) P/F @ 42%; January, April, July, October; see Special Condition 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.

Permit No. NC0021121
A. (2) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached table (using a sufficiently sensitive
detection level in accordance with 40 CFR Part 136). Samples shall represent seasonal variations. 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
NitratelNitrite l,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 P-chloro-m-creso 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 lndeno( 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-nitrosodimethylaminc
Chloroethanc 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-dichlaroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- A MR-PPA1 or in a form approved by the Director within
90 days of sampling. The report shall be submitted to the following address: Division of Water Quality, Water Quality
Section, Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.

Permit No. NC0021121
7 .
SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
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 February 1998, or subsequent versions or "North Carolina Phase
II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be
performed during the months of January, April, July, and October. Effluent sampling for this testing 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 -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration
having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable
impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and
further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) 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, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: NC DENR / DWQ / Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Environmental Sciences Branch 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.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality
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.

Ja�jeo srgr�s
A UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
�m yW REGION 4
1,11,7
o sr ATLANTA FEDERAL CENTER
Z�F o2 61 FORSYTH STREET
yrq< PROZ'G� ATLANTA, GEORGIA 30303-8960
2004
2 2 2004
Sergei Chernikov, Ph.D
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJ: Draft NPDES Permits
City of Rockingham - Permit No. NC0020427
Town of Mt. Airy - Permit No. NC0021121
MAR 2 4 20n4
Dear Dr. Chernikov:
In accordance with the EPA/NCDENR MOA, we have completed review of the draft permits
referenced above and have no comments. We request that we be afforded an additional review
opportunity only if significant changes are made to the draft permit(s) prior to issuance or if significant
comments objecting to the permit(s) are received. Otherwise, please send us one copy of each final
permit when issued.
Sincerely,
Marshall Hyatt, Environmental Scientist
Permits, Grants, and Technical Assistance Branch
Water Management Division
Internet Address (URL) • http://www.epa.gov
Recycled/Recyclable • Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 30% Postconsumer)

NORTH CAROLINA
FORSYTH COUNTY
AFFIDAVIT OF PUBLICATION
1)1FIE)
4.: DEC 2 9 2003 I iL'I1
Before the undersigned, a Notary Public of said County and State, d ly
commissioned, qualified, and authorized by law to administer oa dihna:; 1C,
appeared D.H. Stanfield, who being duly sworn, deposes and says: that he is "
Controller of the Winston-Salem Journal, engaged in the publishing of a newspaper
known as Winston-Salem Journal, published, issued and entered as second class mail
in the City of Winston-Salem, in said County and State: that he 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 Winston-Salem Journal on
the following dates:
December 20, 2003
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 the requirements and qualifications of Section 1-597 of the
General Statues of North Carolina and was a qualified newspaper within the meaning
of Section 1-597 of the general statues of North Carolina.
This 22nd day of December, 2003
(signature of perso , ing affidavit)
Sworn to and subscribed before me, this 22nd day of De
My Commission expires: September 28, 2005
ber, 2003
Notary relic
OFFICIAL SEAL
Notary Public, North Carolina
COUNTY OF FORSYTH r
%Q9?
KIMALEY,ON ee
• My Commission Expires '7•alroi!!dy %(
PUBLIC NOTICE
STATE OF NORTH CAROUNA
ENVIRONMENTAL MANAGEMENT COMMISSION/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617 •
• NOTIFICATION OF INTENT TO ISSUE A
NPDES WASTEWATER PERMIT .
On the basis of thorough staff review and application of NC General Stat-
ute 143.21, Public law 92-5C0 and other lawful standards and regula-
tions, the North Carolina Environmental Management Commission pro-
poses to issue a National Pollutant Discharge Elimination System
(NPDES) wastewater discharge permit to the person(s) listed below ef-
fective 45 days from the publish date of this notice.
Written comments regarding the proposed permit will be accepted until
30 days after the publish date of this notice. All comments received prior
to that date are Considered in the final determinations regarding the pro-
posed permit. The Director of the NC Division of Water Quality may der
ode to hold a public meeting for the proposed permit should the Division
receive a significant degree of public interest.
Copies of the draft Permit and other supporting information on file used,
to determineconditions present in the draft permit are available t ton re—
quest and payment of the costs of reproduction. Mail comments acid/dr
requests for inlormationto the NC Division of Water Quality at the above
address or call Ms. Valery Stephens at [phone], extension 520.
Please include the NPDES permit number (attached) in any communica-
tion. Interested persons may also visit the Division of Water Quality at
512 N. Salisbury Street, Raleigh, NC 27604-1148 between the hours of
8:00 a.m. and 5:00 p.m. to review information on file.
The Town of Pilot Mountain in Piot Mountain, North Carolina has ap-
plied for renewal of NPDES permit NC0068365 for its Pilot Mountain Wa-
ter Treatment Plant in Surry CountrtNy. This pemtitted facility discharggees
treated filter backwash from one ou fall toTom's Creek in the Yadkin -Pee
Dee River Basin. Currently, total residual chlorine is water quality limited.
This discharge may affect future allocations in this portion of the wa-
tershed. The City of Mount Airy (P.O. Box 70, Mount Airy, 27030) has applied for
renewal of NPDES permit NC0021121 for the Mount Airy WWTP m Suny.
This permitted facility discharges treated wastewater to the Ararat River
in the Yadkin -Pee Dee Riser Basin. Currently BOD, ammonia nitrogen,
cyanide, lead, mercury, cadmium and total residual chlorine are water
quality limited. This discharge may affect future allocations intNs portion
of the Yadkin Pee -Dee River Basin.
WSJ: December 20, 2003

C
NORTH CAROLINA
SURRY COUNTY
AFFIDAVIT OF PUBLI
DEC 3 0 2003
ATIafl-t A°rEQ
s r SOu'rnc.r' r • .
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
MOUNT AIRY NEWSPAPERS, INC., 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
ttd 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 aReA day of �° ,�C-eA , 2003
Signature of person making affidavit
Sworn to andscribed before me, this
bub
c,41.4,4)1x) 44.4.
Notary Public
My Commission expires:
August 17, 2004
, 2003
day of
•
CLIPPING OF
LEGAL
'Y ADVERTISEMENT
_ ATACHED HERc
PUBLIC NOTICE
STATE OF NORTH
CAROLINA
ENVIRONMENTAL
MANAGEMENT COM-
MISSION/ NPDES
UNIT
1617 MAIL SERVICE
CENTER
RALEIGH, NC 27699-
1617
NOTIFICATION OF IN-
TENT TO ISSUE A
NPDES WASTE
WATER PERMIT
On the basis of thor-
ough staff review and
application of NC Gen-
eral Statute 143.21
Public law 92-500 and
other lawful standards
and regulations, the
North Carolina Envi-
ronmental Manage-
ment Commission pro-
poses to issue a Na-
tional Pollutant Dis-
charge Elimination
System (NPDES)
wastewater discharge
permit to the person(s)
listed below effective
45 days from the pub-
lish date of this notice.
Written comments re-
garding the proposed
permit will be accepted
until 30 days after the
publish date of this no-
tice, All comments re-
ceived prior to that
date are considered in
the final determinations
regarding the proposed
permit. The Director of
the NC Division of Wa-
ter Quality may decide
to hold a public meet-
ing for the proposed
permit should the Divi-
sion receive a signifi-
cant degree of public
interest.
Copies of the draft per-
mit and other support-
ing information on file
used to determine con-
ditions present in the
draft permit are availa-
ble upon request and
payment of the costs of
reproduction. Mail
comments and/or re-
quests for information
to the NC Division of
Water Quality at the
above address or call
Ms. Valery Stephens at
[phone], exten-
sion 520. Please in-
clude the NPDES per-
mit number (attached)
i in any communication.
Interested persons
may also visit the DM-
sion of Water Quality at
512 N. Salisbury
I Street, Raleigh, NC
27604-1148 between
the hours of 8:00 a.m.
and 5:00 p.m. to review
information on file.
The Town of Pilot
Mountain in Pilot
Mountain, North Caroli-
na has applied for re-
newal of NPDES per-
mit NC0068365 for its
Pilot Mountain Water
Treatment Plant in Sur-
ry-County. This permit-
ted facility discharges
treated filter backwash
from one outfall to
Tgni's Creek: in the
Yadkin -Pee Deg River
Basin. Currently, total
residual chlorine is wa-
ter quality limited. This
discharge may affect
future allocations in
this portion of the wa-
tershed.
The City of Mount Airy
( P 0 Box 70, Mount
Airy, 27030) has ap-
plied for renewal of
NPDES permit NCDES
permit NC00212121 for
the Mount Airy WWTP
' in Surry. This permitted
' facility discharges
treated wastewater to
the Ararat River in the
Yadkin Pee -Dee River
Basin. Currently BOD,
ammonia nitrogen, cy-
anide, lead mercury,
cadmium and total re-
sidual chlorine are wa-
ter quality limited. This
discharge may affect
future allocations in
this portion of the Yad-
kin Pee -Dee River Ba-
sin.
December 20, 2003

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0021121
Facility Information
(1.) Facility Name:
Mount Airy WWTP
(2.) Permitted Flow:
7.0 MGD
(5.) County:
Surry
(3.) Facility Class:
IV
(6.) Regional Office:
Winston-Salem
(4.) Facility/Permit Status:
(i.e. New, Modification,
Existing or Renewal)
Renewal
(7.) USGS Topo Quad:
B16NE
Stream Characteristics
(1.) Receiving Stream:
Ararat River
(2.) Stream Classification:
C
(6.) Winter 7Q10 (cfs):
31
(3.) Subbasin:
030703
(7.) 30Q2 (cfs):
(4.) Drainage Area (mi2):
75.2
(8.) Average Flow (cfs):
90
(5.) Summer 7Q10 (cfs)
14.9
(9.) IWC (%):
42
SUMMARY
This facility is a major municipal treatment plant operating in Surry County that serves 8,000
people. City has a separate sewer collection system. The facility has permitted flow of 7.0
MGD discharging into the Ararat River. For the past 2 years annual average flow varied within
the range of 3.4-3.9 MGD. Ararat River is on the 303 d list due to biological impairment,
sediment is listed as one of the main causes of impairment. 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. City of Mt. Airy has 7 significant industrial
users and a full-scale pretreatment program. The permit will continue to require the City to
implement its pretreatment program.
REASONABLE POTENTIAL ANALYSIS
The following parameters are monitored through the permit: Pb, Cn, Hg, Cu, Zn, Ag, Cl. The
following parameters are monitored quarterly through the pretreatment program: As, Cd, Cr,
Cu. Pb, Hg, Mo, Ni, Se, Zn, Cn, Ag, NH3.
Reasonable potential analysis was conducted for: As, Cd, Cr. Cu, Pb. Hg, Ni, Se, Zn, Cn, Ag,
CI (see attached).
TOXICITY TESTING:
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Chronic P/F
001: Chronic P/F @ 42%
001: Chronic P/F @ 42%
January, April, July, and October
The facility has been consistently passing its WET tests with two exceptions. Mt. Airy failed its
toxicity tests on 04/02/01 and 09/02/01. Toxicity tests conducted after failures passed.
COMPLIANCE SUMMARY:
Page 1
Version: April 14, 2004

DMRs have been reviewed for the period January 2000 through September 2003. Facility has a
mixed compliance record. During the review period, the following NOVs (notices of violation)
have been issued: 05/21/03 — CN daily max., 10/31/02 - fecal daily max., 01/22/02 - Hg daily
max., 02/06/02 - Hg daily max., 05/01/02 - Hg daily max., 05/01/02 - Pb daily max., 05/08/02 -
CN daily max., 03/01/02 — fecal weekly average, 06/25/01 - Hg daily max,11/19/01 — Hg daily
max., 12/17/01- Hg daily max.
A compliance evaluation inspection conducted on October 29, 2003 found that the facility is
well maintained and properly operated, the only minor issue that needed to be addressed was
the method for collecting composite samples. An on -site inspection conducted on October 21,
2002 did not find any operational or maintenance problems. Compliance evaluation inspection
conducted on October 11, 2000 found only few minor deficiencies.
INSTREAM MONITORING:
Instream monitoring is required for temperature, dissolved oxygen, fecal coliform, and
conductivity. Monitoring is conditionally waived based on the participation in the Yadkin -Pee
Dee Monitoring Coalition. An analysis of DO, temperature and conductivity data showed that
the facility may contribute to some negative impact on DO and temperature of the stream and
some negative influence on conductivity of the stream water (table is attached). However, it is
necessary to emphasize that the downstream monitoring station is located below the confluence
with a large tributary that might have some influence on instream water quality. Therefore, it is
difficult to conclusively determine the impact of the permitted facility on the water quality in
the receiving stream.
PROPOSED CHANGES:
• Monitoring Frequencies: Weekly monitoring for chromium and cadmium has been
introduced due to the implementation of the new permit limit. Monitoring for oil and grease
has been reduced to quarterly due to the elimination of the limit.
• Limits: Based on the Reasonable Potential Analysis, limits are being introduced for
chromium and cadmium. In addition, weekly average limit for ammonia nitrogen has been
added to the permit. The daily maximum limit for lead is being reduced to 34 µg/L. The
limit for oil and grease has been eliminated based on the monitoring data.
• Priority pollutant monitoring on an annual basis has been added to fulfill the permit
application requirement in the future.
Existing Hermit limits and recommended limits/monitoring are summarized in the table below:
Parameter
Existing Limit (µg/L)
Existing
Monitoring
Proposed Limit (µg/L)
Pro osed
P ,
Monitoring
Cadmium
None
None
4.7
Weekly
Lead
59
Weekly
34
Weekly
Cyanide
12
Weekly
12
Weekly
Mercury
0.028
Weekly
0.028
Weekly
The existing monitoring frequency for silver, zinc, and copper remains unchanged. Due to the
facility's toxicity record, limits for these action level standards will not be implemented, but
monitoring will remain. All other parameters evaluated showed no reasonable potential to
exceed the instream water quality limits or federal criteria.
Page 2
Version: April 14, 2004

PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: December 17, 2003 (est.)
Permit Scheduled to Issue: February 9, 2004 (est.)
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please
contact Sergei Chernikov at [phone] ext. 594.
REGIONAL OFFICE COMMENT:
NAME: DATE:
EPA COMMENT:
NAME: DATE:
Page 3
Version: April 14, 2004

Whole Effluent Toxicity Testing Self -Monitoring Summary October 14, 2003
FACILITY REQUIREMENT YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Mt. Airy WWTP chr lim: 42%
NC0021121/001 Begin:2/I/2000 Frequency Q Jan Apr Jul Oct
County: Surry Region: 1VSRO Subbasin: YADO3
PF: 7.0 Special
7Q10: 14.9 IWC(%; 42.0
+ NonComp Single
V 1999 Pass - - Pass
2000 Pass - - Pass
2001 Fail,Pass 72.8 72.7 Pass
2002 Pass - - Pass
2003 Pass - - Pass
Pass - - Pass
Pass - - Pass
Fall 51.4 72.7 Pass
Pass - - Pass
Pass -
Mt. Gilead WWTP chr lim: 3.2% 1999 - - Pass - - - - - Late Pass - Pass
NC002I105/001 Bcgin:3/1/2000 Frequency Q Mar Jun Sep Dec + NonComp Single 2000 - - Pass - - NR Pass - H Pass - Pass
County: Montgomery Region: FRO Subbasin: YADIO 2001 - - NR NR Pass Pass - - Pass - - Pass
PF: 0.85 Special 2002 - - Pass - - Pass - - Late Pass - Pass
7Q10: 40 IWC(%3.2 2003 - - Pass - - Pass - -
Mt. Holly WWTP chr lim: 6%
NC0021156/001 Begin:5/I/2002 Frequency Q Feb May Aug Nov + NonComp Single
County: Gaston Region: MRO Subbasin: CTB33
PF: 4.0 Special
7Q10: 95.0 1 WC(%; 6.0
1999 - Pass - - Pass - - Pass - - Pass
2000 - Pass - - Pass - - Pass - - Pass
2001 - Pass - - Pass - - Pass - - Pass
2002 - Pass - - Pass - - Pass - - Pass
2003 - Pass - - Pass - - Pass
Mt. Olive Pickle P-2 chr monit (100, 75, 50,25, 12.5, 6.25)
NC0001074/001 Begin:2/1/1996 Frequency Q Jan Apr Jul Oct NonComp
County: Wayne Region: WARO Subbasin: CPF21
PF: 0.40 Special
7Q10: 0.0 IWC(%;100
i 1999 35.4
2000 8.84
2001 17.7
2002 17,7
2003 35.4
17.68 - - 8.84 - - 35.4
35.4 - - NR!Late 36.43 - 35.4
17.7 - - <6.25 - - 8.84
17.7 - - 17.7 - - 17.5
35.4 - - 35.4
Mt. Olive WWTP chr lim: 90% 1999 - - Late Pass - Pass - - Pass - - Late
NC0020575/001 Begin:6/1/2003 Frequency Q P/F + Mar Jun Sep Dec NonComp Single 2000 Pass - Pass - - Pass - - Pass - - Pass
County; Wayne Region: WARO Subbasin: CPF21 2001 - - Pass - - Pass - - Pass - - Pass
PF: 1.0 Special 2002 - - Pass - - Pass - - Pass - - Pass
7Q10: 0.0 IWC(%;100 2003 - - Pass - - Pass - -
Mt. Pisgah Lodge/Recreation Area chr lim: 25%
NC0072729/001 Begin:12/1/2001 Frequency Q Feb May Aug Nov + NonComp Single
County: Haywood Region: ARO Subbasin: FRB05
PF: 0.032 Special
7Q10: 0.15 IWC(% 25
1999 - NR/I-I H - Late Pass - Pass - - Fail
2000 H H - Pass,>75 61.2 - - NR/Fail 61.2 61.2 Pass
2001 - H - - H - - Pass - - H
2002 - H - - Fail 35.4 <12.5,>100 Pass - - Pass
2003 - H - - Pass - - Pass
Murphy WWTP chr lim: 1.5% 1999 - - Pass - - Pass - - Pass - - Pass
NC0020940/001 Begin:3/1/1998 Frequency Q P/F + Mar Jun Sep Dec + NonComp Single 2000 - - Pass - - Pass - - Pass - - Invalid
County: Cherokee Region: ARO Subbasin: HIWO2 2001 - - Pass - - Pass - - Pass - - Pass
PF: 0.925 Special 2002 - - Pass - - Pass - - Pass - - Pass
7Q10: 96.9 IWC(% 1.5 2003 - - Pass - - NR NR NR
N. Buncombe High School chr lim: 90% 1999 NR/Pass - - Pass - - Fail Late Fail Fail >100 92.5
NC0061182/001 Bcgin:10/1/1995 Frequency Q P/F + Jan Apr Jul Oct NonComp Single 2000 Fail 92.5 >100 Pass - - Fail >100 >100 Pass - -
County:Buncombe Region: ARO Subbasin: FRB02 2001 Pass - - Late Invalid - Pass - - Fail 92.5 92.5
PF: 0.025 Special 2002 Pass - - Pass - - Pass - - Pass - -
7Q10: 0.0 IWC(% 100 2003 Pass - - Fail <45 92.5 Pass -
National Spinning Co. -Washington 24hr p/f ac lim: 90% fthd 1999 - Pass - - Pass - - Pass - - Pass
NC0001627/001 Begin:4/1/2003 Frequency Q P/F + Feb May Aug Nov NonComp Single 2000 - Pass - - Pass - - NR/Pass - - Pass
County: Beaufort Region: WARO Subbasin: TAR07 2001 - Pass - - Pass - - Pass - - Pass
PF: 2.25 Special 2002 - Pass - - Pass - - Pass - - Pass
7Q10: TIDAL IWC(%; NA 2003 - Fait Pass - Pass - - Pass
National Welders Supply Company 24hr LCSO ac monit epis fthd (grab)
NC0079758/001 Begin:2/1/2002 Frequency A
County: Mecklenburg Region: MRO Subbasin: CTB34
PF: 0.0143 Special
7Q10: 0.0 IWC(%;100
NonComp
1999 - 87
2000 - -
2001 - 50.2
2002 93.1 -
2003 -
>1- 00
NE Brunswick County WWTP 24hr p/f ac lim: 90% 1999 - - - - - - - - - -
NC0086819/001 Begin:7/1/2002 Frequency Q P/F + Jan Apr Jul Oct + NonComp Single 2000 - - - N - - N - - N
County: Brunswick Region: WIRO Subbasin: CPF17 2001 N - - N - - N - - N
• PF: 1.65 Special 2002 N - - ' N - - N - - N
7Q10: NA 11VC(%',NA 2003 N - - N - - N -
Y Pre 1999 Data Available
LEGEND:
PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M. Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement
Begin = First month required 7Q10 = Receiving stream low flow criterion (cfs + = quarterly monitoring increases to monthly upon failure or N Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement
PF = Permitted flow (MGD) IWC%= Instream waste concentrati P/F = Pass/Fail test AC = Acute CHR = Chronic
Data Notation: f - Fathead Minnow; • - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P P. Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tox Unit; bt - Bad test
Reporting Notation: -- = Data not required; NR - Not reports Facility Activity Status: 1 - Inactive, N • Newly lssued(To construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed
31
Re

NC0021121 Rockingham
Upstream
Downstream
Date
Temp D.O. Conductivity
(2C) (mg/L) umhos/cm)
Temp D.O. Conductivity
(2C) (mg/L) umhos/cm)
06/01 / 1998
06/10/1998
06/18/1998
06/25/1998
07/01/1998
07/07/1998
07/13/1998
07/21/1998
07/28/1998
08/03/1998
08/11/1998
08/18/1998
08/28/1998
09/01/1998
09/12/1998
10/05/1998
10/15/1998
11/09/1998
12/02/1998
01/04/1999
02/03/1999
03/08/1999
04/01/1999
05/03/1999
05/14/1999
05/18/1999
05/24/1999
06/04/1999
06/07/1999
06/14/1999
06/21/1999
07/01/1999
07/09/1999
07/12/1999
07/19/1999
07/26/1999
08/02/1999
08/13/1999
08/16/1999
08/23/1999
08/30/1999
09/10/1999
09/13/1999
09/20/1999
09/29/1999
10/11/1999
22.0
16.5
19.0
21.5
21.0
25.0
23.5
23.0
23.0
21.0
22.0
24.0
25.0
24.5
20.5
17.5
14.5
8.0
7.5
1.0
8.0
4.0
11.7
13.5
16.4
17.4
18.7
17.0
20.2
20.8
17.7
22.8
23.0
19.2
21.9
24.0
25.5
23.5
24.3
18.0
18.0
17.0
16.0
14.0
16.0
17.3
9.6
9.3
8.9
8.1
8.2
8.2
8.4
8.7
6.2
8.9
7.9
8.2
8.8
8.8
8.8
8.6
9.7
11.7
12.1
11.8
10.8
14.2
11.2
10.5
8.8
10.3
9.0
8.5
8.7
9.2
9.2
7.0
7.4
8.1
8.4
8.0
7.6
7.0
7.5
8.2
8.8
9.0
9.4
9.0
9.8
9.2
56
50
53
187
60
52
60
56
60
61
59
62
64
58
58
61
61
58
60
65
73
64
62
57
21.5
18.0
20.0
23.0
21.0
25.0
23.0
24.5
24.0
22.0
23.0
25.0
25.5
25.5
21.0
18.5
16.0
10.0
10.5
1.5
9.0
5.0
12.7
14.2
16.9
18.6
19.4
18.5
21.6
22.1
18.8
23.9
24.0
19.8
23.3
24.6
26.1
25.5
25.2
19.5
19.0
18.0
17.0
15.0
17.0
18.0
9.8
9.5
9.3
7.4
4.4
8.1
7.1 497
8.1
7.0
8.7 672
6.9
10.1 591
7.7
8.4 1298
8.6
8.1 543
9.1 1223
10.1 605
10.0 841
12.0 126
10.6 335
12.4 228
10.5 375
9.8 413
8.4
9.7 540
8.4
6.9
8.0 741
8.2 718
8.3
6.7
6.3
8.0 386
5.1 540
6.9
6.5 828
6.5
7.1 1073
7.0
7.2
8.5
8.4 762
8.2 780
8.0
8.9 300
382

11/01/1999 13.9 9.2 58 15.4 8.1 761
12/06/1999 9.9 9.9 58 11.2 9.1 646
01 / 10/2000 7.0 10.6 56 7.1 10.5 126
02/01/2000 1.6 12.4 61 3.2 10.4 541
03/01/2000 10.3 13.0 57 11.9 10.3 631
04/26/2000 13.7 9.7 57 14.4 10.1 424
05/03/2000 18.9 7.2 57 19.8 8.8 592
05/ 11 /2000 17.4 8.4 18.6 7.1
05/18/2000 17.4 8.3 58 18.9 7.5 796
05/25/2000 20.5 8.9 21.7 6.4
06/02/2000 21.1 8.9 22.5 7.2
06/06/2000 18.5 6.4 50 19.1 8.2 322
06/16/2000 19.8 6.5 20.0 6.8
06/22/2000 23.9 8.3 62 24.9 7.5 813
06/30/2000 21.8 8.8 22.3 8.5
07/05/2000 23.4 8.5 61 23.7 7.1 456
07/14/2000 21.3 8.6 22.8 7.9
07/19/2000 23.4 8.3 65 24.8 7.6 1100
07/24/2000 20.5 8.1 21.4 7.7
08/03/2000 21.3 7.9 22.5 7.2
08/07/2000 24.7 8.6 66 25.5 7.2 588
08/18/2000 22.6 8.1 24.3 6.9
08/23/2000 21.3 8.2 64 23.4 7.3 1246
09/01/2000 23.9 8.5 24.9 7.8
09/06/2000 18.6 9.2 19.4 5.7
09/14/2000 22.4 7.9 23.2 7.4
09/21/2000 19.1 8.1 61 21.0 7.5 907
09/28/2000 14.1 9.6 64 16.0 8.9 765
10/24/2000 14.8 9.4 66 16.0 8.4 900
11/28/2000 7.6 11.8 55 9.4 10.4 596
12/18/2000 3.4 11.9 55 4.4 11.2 307
01/08/2001 2.3 12.0 28 4.5 7.4 307
02/06/2001 6.4 12.1 64 7.9 9.0 625
03/07/2001 6.3 10.5 57 7.5 11.2 539
04/02/2001 11.4 9.9 62 12.0 10.1 185
05/03/2001 19.8 9.4 20.7 7.9
05/08/2001 17.7 9.3 67 18.7 9.0 805
05/18/2001 15.4 10.0 16.4 8.5
05/24/2001 18.6 8.7 59 18.6 8.3 317
05/30/2001 21.0 7.9 21.5 7.9
06/08/2001 21.0 9.0 70 22.2 8.6 662
06/13/2001 21.6 8.3 22.9 7.8
06/21/2001 26.0 7.7 67 26.3 7.3 943
06/27/2001 23.5 8.3 23.7 7.8
07/02/2001 23.4 7.8 23.6 6.2
07/16/2001 20.1 7.7 65 20.6 6.6 566
07/23/2001 21.8 8.1 60 22.2 5.6 514
07/30/2001 19.0 8.3 22.8 5.8 295
08/06/2001 22.4 7.6 62 23.3 5.3
08/13/2001 22.6 7.1 20.9 6.7 397
08/20/2001 20.4 7.7 50 22.3 5.1
08/27/2001 22.1 5.5 21.3 5.6

09/04/2001
09/10/2001
09/17/2001
09/24/2001
10/08/2001
11/12/2001
12/03/2001
01/14/2002
02/11/2002
03/04/2002
04/08/2002
05/06/2002
05/14/2002
05/21/2002
05/30/2002
06/04/2002
06/10/2002
06/20/2002
06/27/2002
07/01/2002
07/08/2002
07/16/2002
07/25/2002
08/05/2002
08/13/2002
08/21/2002
08/27/2002
09/03/2002
09/09/2002
09/19/2002
09/23/2002
10/07/2002
11/04/2002
12/02/2002
1/6/2003
2/10/2003
3/17/2003
4/7/2003
5/6/2003
5/12/2003
5/20/2003
5/29/2003
6/3/2003
6/9/2003
6/17/2003
6/23/2003
7/14/2003
7/28/2003
8/11/2003
20.6
21.3
17.5
19.6
9.9
6.8
8.3
2.4
5.2
3.7
9.1
15.1
15.7
14.0
18.9
24.0
20.9
20.9
23.5
25.3
24.2
23.9
21.4
24.6
25.6
23.8
22.1
23.3
23.1
22.3
20.8
18.4
8.3
2.3
3.7
3.4
12.4
12.8
16.5
16.3
17.5
16.9
17.9
17.6
19.7
20.2
21.0
23.6
22.3
7.2
6.8
6.7
7.3
9.2
10.0
9.3
10.2
10.1
10.3
9.4
7.2
9.7
8.1
6.8
8.1
6.1
7.1
5.8
6.2
6.0
5.4
5.5
5.5
5.8
5.4
6.2
5.8
5.9
6.0
5.9
6.6
8.6
9.7
9.6
10.3
10.1
9.8
9.6
9.3 63
8.7
9.1 71
9.0
9.0 50
9.3
9.0
8.4
6.7
8.0
82
108
64
53
83
78
89
79
59
102
106
89
81
79
58
50
91
82
144
286
319
50
221
296
69
127
140
93
63
21.8
17.7
20.1
10.8
7.4
8.8
2.8
5.5
4.0
9.5
15.4
16.0
14.3
19.2
24.2
21.1
21.4
23.8
25.6
24.6
24.2
21.9
24.9
26.0
24.0
22.5
23.8
23.5
22.7
21.1
18.8
8.8
2.7
4.1
3.9
11.9
12.5
16.3
16.2
17.4
16.9
17.7
17.4
19.4
20.3
20.9
23.8
22.6
19.3
5.7
5.5
6.3
8.2
9.6
8.9
9.8
9.9
10.1
9.3
7.0
9.2
8.1
6.6
7.8
5.9
6.7
5.5
5.9
5.9
5.2
5.3
5.3
5.5
5.4
6.1
5.6
5.7
5.8
5.7
6.3
8.3
9.4
9.3
10.1
10.0
9.8
9.2
9.4
8.5
9.2
8.7
8.9
9.1
9.2
8.3
6.9
8.3
8.8
292
366
317
298
289
249
212
197
253
238
294
377
356
97
276
332
94
153
173
281
238
217
231
130
112
123
132
128
135
122
135
128
129
Average
Maximum
Minimum
18.57
25.50
1.00
9.02
14.20
6.20
65.33
187.00
50.00
19.56
26.10
1.50
8.27
12.40
4.40
623.49
1298.00
125.80

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Selenium
Max. Pred Cw
Allowable Cw
5.000
11.9
sd1c,
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0000
5.000
0.0000
14
1.00
5.000 µg/1
5.000 µg/1
11.9 µg/1
Parameter =
Standard =
Selenium
5.0
Date n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
9/5/2002
1 < 10 5.0
2 < 10 5.0
3 < 10 5.0
4 < 10 5.0
5 < 10 5.0
6 < 10 5.0
7 < 10 5.0
8 < 10 5.0
9 < 10 5.0
10 < 10 5.0
11 < 10 5.0
12 < 10 5.0
13 < 10 5.0
14 < . 10 5.0
µln

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Zinc
Max. Pred Cw
Allowable Cw
Allowable #/day
l(/p 111-;4- tad - ;0,v I t t/-
371.5
118.7
0.0
RESULTS
Std Dev. 42.0670
Mean 100.2
C.V. 0.4199
Number
of data points
Mutt Factor =
Max. Value
Max. Pred Cw
Allowable Cw
16
1.95
191.0 µg/1
371.5 µg/1
118.7 µg/1
Parameter =
Standard =
Zinc
50.0
Date n < Actual Data BDL=1/2DL
1 191 191.0
2 1 1.0
3 144 144.0
4 139 139.0
5 96 96.0
6 73 73.0
7 98 98.0
2/7/2002
8 110 110.0
9 136 136.0
3/7/2002
4/2/2002
10 95 95.0
11 111 111.0
12 100 100.0
13 57 57.0
14 84 84.0
15 ;91 91.0
9/5/2002 16 177 77.0
1/9/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
5/17/2002
6/20/2002
7
µg/1

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Silver
Max. Pred Cw
Allowable Cw
1
5.00
0.14
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0000
5.0
0.0000
16
1.00
5.00 µg/1
5.00 µg/1
0.14 µg/1
Parameter =
Standard =
Silver
0.06
Date n < Actual Data BDL=1/2DL
1/9/2001 1 <
4/3/2001 2 <
7/17/2001 3 <
9/19/2001 4 <
10/3/2001 5 <
11/6/2001 6 <
12/5/2001 7 <
1/16/2002 8 <
2/7/2002 9 <
3/7/2002 10 <
4/2/2002 11 <
5/17/2002 12 <
6/20/2002,13 <
7/ 19/2002_ 14 <
8/8/2002 15
9/5/2002 16 <
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
5.0
2.5
ugh

Facility Name =
NPDES # =
Qiv (MGD) =
7Q10s (cfs)=
IWC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Arsenic
Max. Pred Cw
Allowable Cw
5
118.7
RESULTS
Std Dcv.
Mean
C.V.
Number
of data points
Malt Factor =
Max. Value
Max. Bred Cw
Allowable Cw
0.0000
5.0
0.0000
14
1.00
5.0 µg/1
5 µg/I
118.7 AO
Date
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
_ 1/16/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
9/5/2002
Parameter =
Standard =
Arsenic
50.0
n < Actual Data BDL=1/2DL
1 < 10
2
3 <
10
10
4 < 10
5 < 10
6 < 10
10
8 < 10
9 < 10
10
10
11 < 10
12 <
13 <
14 <
10
10
10
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
—111ir A1-1-014A/31.£ FaR Afk gA56D orl (-tutuAA1 d{c,T►.)ic IS 94'e--.
-nrA-N 7ME ALLOWk'! Le full- Aqurlr(c LrFE-Th1e2EF02.6- AS 15 eki4Lv iire
$g5Elj 0/3 74E, ,4 w T(G brpzi S't74PrDh .
µg/I

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Cadmium
Max. Pred Cw
Allowable Cw
6.047
4.7
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.5000
1.125
0.4444
16
2.02
3.000 µg/l
6.047 µg/1
4.7 µg/1
Parameter =
Standard =
Cadmium
2.0
Date n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
8/8/2002
9/5/2002
1 <
2 <
3 <
4
5 <
6 <
7 <
8 <
9 <
10 <
11 <
12 <
13 <
14 <
15 <
16 <
2
1.0
1.0
1.0
3.0
1.0
1.0
1.0
1.0
1.0
1.0
. 1.0
.1.0
2 1.0
201 ,..1.0
2 1.0
2
2
3
2
2
2
2
2
2
2
2
µlb

Facility Name =
NPDES # =
Qw (MGD) =
7Q1Os (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Cyanide
Max. Pred Cw
Allowable Cw
ACAAk
22j.ki/c,
31.7
11.9
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.6171
5.5
0.4785
16
2.12
15.0 µg/1
31.7 µg/1
11.9 µg/1
Parameter =
Standard =
Cyanide
5.0
Date n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
.7/19/2002
8/8/2002
9/5/2002
1 < 10 5.0
2 < 10 5.0
3 < 10 5.0
4 < 10 5.0
5 < 10 5.0
6 < 10 5.0
7 15 15.0
8 < 10 5.0
9 < 5 2.5
10 < 10 5.0
11 < 10 5.0
12 < 10 5.0
13 < 10 5.0
14 < 10 5.0
15 < • 10 5.0
16 < 10 ' 5.0

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Copper
Max. Pred Cw
Allowable Cw
841.4
16.6
A/ 04" WC"
RESULTS
Std Dev. 71.9268
Mean 115.5
C.V. 0.6227
Number
of data points'
Mult Factor =
Max. Value
Mast. Pred Cw
Allowable Cw
16
2.57
327.0 µg/1
841.4 µg/l
16.6 µg/1
Date
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
8/8/2002
9/5/2002
Parameter =
Standard =
Copper
7.0
n < Actual Data BDL=1/2DL
1 86.0 86.0
2 56.0 56.0
3 174.0 174.0
4 147.0 147.0
5 327.0 327.0
6 146.0 146.0
7 173.0 173.0
8 80.0 80.0
9 98.0 98.0
10 84.0 84.0
11 65.0 65.0
12 153.0 153.0
13 90.0 90:0
14 26.0 26.0
15 52.0 52.0
16 91.0 91.0
µPS

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Chromium
Max. Pred Cw
Allowable,Cw
tw 1-
7.583
118.7
/0 22 45
Vw.
RESULTS
Std Dev.
Mean
C.V.
Number .
of data points
Mull Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.6682
2.7
0.2494
15
1.52
5.000 µg/1
7.583 µg/1
118.7 µg/1 _
Parameter =
Standard =
Chromium
50.0
Date n < Actual Data BDL=1/2DL
µg/1
1/9/2001 1 < 5 2.5000
4/3/2001 2 5 5.0000
7/17/2001 3 < 5 2.5000
9/19/2001 4 < 5 2.5000
10/3/2001 5 < 5 2.5000
11/6/2001 6 < 5 2.5000
12/5 7 < 5 2.5000
1/16/2002 8 < 5 2.5000
3/7/2002 9 < 5 2.5000
4/2/2002 10 < 5 2.5000
5/17/2002 11 < 5 2.5000
6/20/2002 12 < 5 2.5000
7/19/2002 13 <
8/8/2002 14 <
9/5/2002 15
51 2.5000
51 \. 2.5000

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Mercury
Max. Pred Cw
Allowable Cw
1.041
0.028
l
Parameter =
Standard =
Mercury
0.012
Date n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
RESULTS
Std Dev.
Mean
Nu' nber'
of data points
Mttlt Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0750
0.119
0.6316
16
2.603
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
8/8/2002
9/5/2002
0.400 µg/1
1.041 µg/1
0.028 µgnu.
1 < 0.20
2 < 0.20
3 < 0.20
4 < 0.20
5 < 0.20
6 < 0.20
7 < 0.20
8 < 0.20
9 0.40
10 < 0.20
11 < 0.20
12 < 0.20
13 < 0.20
;14< 0.20
-15 .< • 0.20
16 < 0.20
0.100
0.100
0.100
0.100
0.100
0.100
0.100
0.100
0.400
0.100
0.100
0.100
0.100
0.100
0.100
0.100
µg/1

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC(%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Lead
Max. Pred Cw
Allowable Cw
tAAA-
57.2
59.3
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
5.7908
10.3
0.5650
16
2.38
24.0 µg/1
57.2 µg/1
59.3 µg/1
Date
Parameter =
Standard =
Lead
25.0
n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
_ 9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
8/8/2002
9/5/2002
1 24.0
2 < 10.0
3 13.0
4 14.0
5 < 10.0
6 < 10.0
7 < 10.0
8 17.0
9 13.0
10 < 10.0
11 < 10.0
12 10.0
13 < 10.0
14 17.0.;':,.:..
15 10.0 /:;
16 11.0
24.0
5.0
13.0
14.0
5.0
5.0
5.0
17.0
13.0
5.0
5.0
10.0
5.0
17.0
•10.0
11.0

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Nickel
Max. Pred Cw 6.182
Allowable Cw 208.8
�cutIft 26fpjJi
No 1 << ,
RESULTS
Std Dev.
Mean
C.V.
Number
` of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.6250
4.8
0.1290
16
1.24
5.000 µg/1
6.182 µg/1
208.8 ltg/1
Parameter =
Standard =
Nickel
88.0
Date n < Actual Data BDL=1/2DL
1/9/2001
4/3/2001
7/17/2001
9/19/2001
10/3/2001
11/6/2001
12/5/2001
1/16/2002
2/7/2002
3/7/2002
4/2/2002
5/17/2002
6/20/2002
7/19/2002
. 8/8/2002
:`. ' 9/5/2002
1 <
2 <
3 <
4 <
5 <
6 <
7 <
8 <
9. <
10 <
11 <
12 <
•13 <
14 <
15 <
16 <"
10
10
10
10
10
10
• 10
10
5
10
10
.10
•10
;10
10
'10
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
2.5
5.0
5.0
5.0
5.0
5.0
5.0
5.0

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Mount Airy
NC0021121
7
14.9
42.14
FINAL RESULTS
Chloride
Max. Pred Cw
Allowable Cw
sr
1075.1
545.9
PA., Lij
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mutt Factor =
Max. Value
Max. Pred Cw
Allowable Cw
129.1934
469.6
0.2751
19
1.51
710.0 mg/1
1075.1 mg/1
545.9 mg/1
Parameter =
Standard =
Chloride
230.0
Date n < Actual Data BDL=1/2DL
Sep-03 1 528.00 528.00
Sep-03 2 590.00 590.00
Aug-03 3 480.00 480.00
Aug-03 4 590.00 590.00
Ju1-03 5 307.00 307.00
Ju1-03 6 188.00 188.00
Ju1-03 7 710.00 710.00
Jun-03 8 515.00 515.00
Jun-03 9 440.00 440.00
May-03 10 468.00 468.00
May-03 11 543.00 543.00
Apr-03 12 444.00 444.00
Apr-03 13 461.00 461.00
Mar-03 14 301.00 301.00
Mar-03 15 631.00 631.00
Feb-03 16 530.00 : 530.00
Feb-03 17 301.00 * 301.00
Jan-03 18 385.00 385.00
Jan-03 19 510.00 : 510.00

P.O. Box 70
Mount Airy, N.C. 27030
Phone: [phone]
Fax: [phone]
of Mt Airy WWTP
August 27, 2003
Mrs. Valery Stephens
NC DENR/Water Quality/Point Source Branch
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Re: NPDES Permit NC 0021121 Renewal
Dear Mrs. Stephens,
The City of Mount Airy is requesting renewal of NPDES Permit NC 0021121 that
expires February 29, 2004. Enclosed please fmd the original application forms along
with two copies. You will notice that we still need to send you another Priority
Pollutant Analysis and Toxicity Test. Mr. Chris Marion of my staff spoke with Ms.
Susan Wilson of your office and she wants us to forward that information to you as
soon as we have the analysis ram The forms include the application for renewal and
our sludge management plan. If you have any questions or require further
information, please contact me at 336-786-3597.
Kent Scott
WWTP ORC
SEP - S

rail
NARRATIVE OF THE SLUDGE MANAGEMENT PLAN
CITY OF MOUNT AIRY WASTEWATER TREATMENT PLANT
The City has two anaerobic sludge digesters that hold 650,000 gallons of sludge each.
rim The sludge is held in the digesters from 30 to 60 days at 98° F, after the appropriate
digestion time the sludge is then pressed to achieve a cake of approximately 20% solids.
The solids are then hauled and disposed of in the Surry County RCRA Sub -Title D lined
landfill.

MIUUKL I-1-2
PRIMARY CLARIFIER N0. I
TRICKLNG FILTER N0. 1
1
.1
J
nji
l
r
T�1
FIR
` SCREENING
FAwUTY
r
INFLUENT
PUMPING STATION
— YELL—(7-
MECH.
BAR
SCREEN- LMANUAL
BAR
SCREEN
WET
INFLUENT
PUMPS
GRIT
CLASSIFIERS
-E=
f
GRIT PUMPS
RAW SEWAGE
DIGESTER BUILDING
D GESTER NO. T
HEAT
ExcHANGER
RECIRCULATION ❑
PUMP
s_Q
I1
-QIttMR:STER II E FEED
T
S �PLIMPS
DIGESTER N0. 21
DIGESTED
SLUDGE
PRETREATMENT
BUILDING
L
PARSNALL
FLUME
BYPASS
/ SLIDE GATE
GRIT
COLLECTORS
PRIMARY CLARIFIER NO
0 I.lrl
2 BYPASS
Ii. TRICKLNi RLIER N0. 2
DOCKEXEO
PRWARY SLUDGE
PRIMARY CLARIFIER N0.13
BYPASS
RECIRCULATION
:�—c_
RECIRCULATION
PUMP
TO SLUDGE
DRYING BEDS
TWCKENED
WAS
SLUDGE
DEWATERING
BUILDING
GRAVITY BELT
THIOCENER
11j
BELT FILTER
PRESS
PROAARY
SLUDGE
PUMPING
STATION
WAS BYPASS
WAS R S/WAS PUMPING
STATION
WAS PUMPS
THICKENED
SLUDGE PUMP
CONVCYOR RAS PUMPS
TRUCK DEWATEREO
SLUDGE TO
DISPOSAL
TRICKLNG FILTER NO. 3
PRIMARY SLUDGE
MD SCUM
PARSNALL
FLUME
RAS
RAS
HEAVY SLUDGE
BYPASS
INTERUEDIA1E
PUMPING STATION
BYPASS
REORO. AION
SCUM
FINAL CLARIFIER
N0. T
th
c1
v
RECIRCULATION
PUMPING STATION
FINAL CLARIFIER
N0. 2
AERATION
BASIN NO. T
AERATOR
MOLD UOUOR
AERATION
BASIN N0. 2
AERATOR
mot►
917
a PA
I►�
►
.41V
•
FWAL CLARIFIER EFFLUENT
LEGEND
PLANT FLOW
BYPASS FLOW
SLUDGE AND SCUM
NPW PUMPS
di
, v
PLANT
EFFLUENT
`JI�J
CIILORINE
CONTACT
• TANKS
MOUNT AIRY
WASTEWATER TREATMENT- PLANT
PROCESS FLOW
SCHEMATIC

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee Dee
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA,
complete part F.
GENERAL INFORMATION: .
F.1. Pretreatment program. Does the treatment works have, or is subject ot, an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number
industrial users that discharge to the treatment works.
a. Number of non -categorical SIUs. 7
or other remedial wastes must
of each of the following types of
questions F.3 through F.8 and
b. Number of CIUs. 0
SIGNIFICANT INDUSTRIAL USER INFORMATION:
to the treatment works, copy
Supply the following information for each SIU. If more than one SIU discharges
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Cross Creek Apparel
Mailing Address: P.O. Box 1107
Mount Airy, N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Knit Shirts
Raw material(s): Yarn, Dye, Etc.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into
day (gpd) and whether the discharge is continuous or intermittent.
1,065,029 gpd (X continuous or intermittent)
the collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0 intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes 0 No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 19 of 22

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
❑ Truck ❑ Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION ■
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2AYOU MUST COMPLETE
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 20 of 22

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
SIGNIFICANT INDUSTRIAL USER INFORMATION:
to the treatment works, copy questions F.3 through F.8 and
Supply the following information for each SIU. If more than one SIU discharges
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Spencers Inc. Plant 1 Willow Street
Mailing Address: 238 Willow Street
Mount Airy, N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Infants Wear
Raw material(s): Yarn, dye, etc.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the
day (gpd) and whether the discharge is continuous or intermittent.
129,335 gpd (X continuous or intermittent)
collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0 intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes 0 No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.B. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check at that apply):
❑ Truck 0 Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED: RIVER BASIN:
Renewal
Yadkin Pee -Dee
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Spencers Inc. Plant 4 Arlington Street
Mailing Address: 238 Willow Street
Mount Airy, N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Infants Wear
Raw material(s): Yarn, dye, etc.
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0
intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes 0 No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
32.936 gpd (X continuous or
intermittent)

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.S. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes El No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
0 Truck 0 Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
SIGNIFICANT INDUSTRIAL USER INFORMATION:
to the treatment works, copy questions F.3 through F.8 and
Supply the following information for each SIU. If more than one SIU discharges
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Sara Lee Sock Company
Mailing Address: 645 West Pine Street
Mount Airy N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Socks
Raw material(s): Yarn, dve. bleach, etc.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the
day (gpd) and whether the discharge is continuous or intermittent.
279,049 gpd (X continuous or intermittent)
collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0 intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
❑ Truck ❑ Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
SIGNIFICANT INDUSTRIAL USER INFORMATION:
to the treatment works, copy questions F.3 through F.8 and
Supply the following information for each SIU. If more than one SIU discharges
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Renfro Corporation
Mailing Address: P.O. Box 908
Mount Airiy, N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturino
F.5, Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Socks
Raw material(s): Yarn. dye, etc.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the
day (gpd) and whether the discharge is continuous or intermittent.
256,373 gpd (X continuous or intermittent)
collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0 intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
0 Yes ® No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
0 Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
0 Truck ❑ Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
0 Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
0 Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
SIGNIFICANT INDUSTRIAL USER INFORMATION:
to the treatment works, copy questions F.3 through F.8 and
Supply the following information for each SIU. If more than one SIU discharges
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Lynne Hosiery
Mailing Address: P.O. Box 987
Mount Airy. N.C. 27030
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Textile Manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Socks
Raw material(s): Yarn, dye, etc.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the
day (gpd) and whether the discharge is continuous or intermittent.
38,012 gpd (X continuous or intermittent)
collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
0 gpd (0 continuous or 0 intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards 0 Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Mount Airy WWTP, NC 0021121
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Yadkin Pee -Dee
F.B. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste
0 Yes 0 No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
❑ Truck 0 Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
by truck, rail or dedicated pipe?
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous 0 Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE