NC0024112_Technical Correction_20090722

NCDENR
North Carolina Department of Environment and
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
July 22, 2009
Ms. Leigh A. Conder,
Hamby Creek WWTP Superintendent
The City of Thomasville
P.O. Box 368
Thomasville, North Carolina 27361
Subject:
Dear Ms. Conder,
Natural Resources
NPDES Permit NCO024112
Error Correction
Hamby Creek WWTP
Davidson County
Dee Freeman
Secretary
On July 10, 2009, the Division of Water Quality issued NPDES Permit No. NCO024112 to the City of
Thomasville. It has been brought to our attention that the Supplement to Permit Cover Sheet does not reflect the
recent upgrade at the Hamby Creek WWTP. Therefore, the Division forwards you the updated version of the
permit. Please discard the previous permit. This permit modification becomes effective on the effective date of the
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).
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.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Ralegh, North Carolina 27604 One
Phone: 9IM07-63001 FAX: [phone] Customer Service: 1-877-623-6748 NorthCarohna
Internet: www.ncwaterquality.org Naturally
An Equal Opportunity 1 Affirmative Action Employer �/ V LL

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 Chemikov at
telephone number [phone].
Sincerely,
'.J Z ,
j� oleen H. Sullins
cc: US EPA, Marshall Hyatt
WSRO-Surface Water Protection
NPDES File
Central Files
1617 Mail Service Center, Ralegh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Ralegh, North Carolina 27604 One
Phone: 91U07-63001 FAX: [phone] Customer Service:1-877-623-6748 NorthCarohna
Internet: www.ncuvaterquality.org a'� l 1�� ` ur`//�
An Equal opportunity % Affirmative Action Employer Y/ �/

Permit NCO024112
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, the
City of Thomasville
is hereby authorized to discharge wastewater from a facility located at the
Hamby Creek WWTP
110 Optimist Park Road
Davidson County
to receiving waters designated as Hamby Creek in the Yadkin -Pee Dee River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective August 1, 2009.
This permit and the authorization to discharge shall expire at midnight on April 30, 2014.
Signed this day July 22, 2009.
3,,—oleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NCO024112
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 Thomasville is hereby authorized to:
1. Continue to operate the existing 6.0 MGD wastewater treatment facility that includes the
following components:
➢ Influent filter screening equipment
➢ Solids classifier grit removal system
➢ Cannibal ® solids reduction system including interchange tanks
➢ 5-stage Bardenpho® oxidation system
➢ Three fine -bubble aeration basins ...
➢ three secondary clarifiers
➢ 6,000,000-gallon reaeration lagoon
➢ UV disinfection
This permitted facility is located at the Hamby Creek WWTP, off Optimist Park Road
near Thomasville in Davidson County.
2. Discharge treated wastewaters from said facility via outfall 001 into Hamby Creek,
currently classified C waters in the Yadkin -Pee Dee River Basin, at the location specified
on the attached map.

NCO024112 - Hamby Creek WWTP
Latitude: 35050'54" Sub -Basin: 03-07-07
Longitude: 80006'51" Quad #: D18SE
Stream Class: C
Receiving Stream- Hamby Creek
Facility
Location
North Map not to scale

Permit NCO024112
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (6.0 MGD)
During the period beginning August 1, 2009 and lasting until expiration, the Permittee shall be authorized to discharge treated
wastewater from Outfall 001 subject to the following effluent limitations and monitoring requirements:
PARAMETER
EFFLUENT LIMITATIONS..
MONITORING REQUIREMENTS
Mon may:..;
Average
Wee
; ~Average
Da 'h' •.• "
Maximum-
Measurement
Frequency
' Sample `
Type'
Sample ,.
Location r.
Flow
6.0 MGD
Continuous
Recording
Influent or
Effluent
BOD, 5-day, 200C 2 (Apr. ill -Oct 31)
(Nov 1- March 31)
4.0 mg/L
6,0 mg/L
6,0 mg/L
9.0 mg/L
Daily
Composite
Influent &
Effluent
Total Suspended Solids 2
30,0 mg/L
45.0 mg/L
Daily
Composite
Influent &
Effluent
NH3-N, mg/L (April 1 - Oct 31)
(Nov 1- March 31)
1.0 mg/L
3.0 mg/L
3.0 mg/L
9.0 mg/L
Daily
Composite
Effluent.
Fecal Coliform (geometric mean)
200/100 mL
400/100 mL
Daily
Grab
Effluent
Dissolved Oxygen
Daily average shall not be less than 6.0 mg/L
Daily
Grab
Effluent
pH
> 6.0 and < 9.0 standard units at all times
Daily -
Grab
Effluent
Temperature, °C
Daily
Grab
Effluent
Conductivity, Nmhos/cm
Daily
Grab
Effluent
Total Phosphorus
Weekly
Composite
Effluent
Total Phosphorus 3 (April 1 -Oct 31)
(Nov 1- March 31)
3,570 lb seasonal total
5,040 lb seasonal total
Seasonally
Seasonally
Calculated)
Calculated
Effluent
Effluent
Total Cadmium (pg/L)
2/Month
Composite
Effluent
Total Lead (Ng/L)
26
34
Weekly
Composite
Effluent
Total Nickel (Ng/L)
92.1
261
Weekly
Composite
Effluent
Total Cyanide4 (Ng/L)
2/Month
Grab
Effluent
Total Chromium (pg/L)
52.3
52.3
1022
Weekly
Composite
Effluent
Total Copper (NgIL)
2/Month
Composite
Effluent
Total Silver (Ng/L)
2/Month
Composite
Effluent
Total Zinc (Ng/L)
2/Month
Composite
Effluent
Total Selenium (pg/L)
5.2
5.2
56
Weekly
Composite
Effluent
Total Mercury (nanograms/L)
13.0
13.0
13.0
Weekly
Grab
Effluent
Total Nitrogen
Monthly
Composite
Effluent
Chronic Toxicity s
Ceriodaphnia,
P/F @ 90%
Quarterly
Composite
Effluent
Pollutant Scan
Annually
Footnote 6
Effluent
Footnotes:
1. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 % of the respective influent values.
2. Monitoring for total phosphorus shall be conducted and calculated as prescribed above and in Condition A.(3) of this permit.
3. The quantitation level for cyanide (CN) shall be 10 µg/L. CN levels reported as < 10 µg/L shall be considered zero for compliance
purposes.
4. Ceriodaphnia P/F @ 90%; February, May, August, November; see A.(4.) of this permit.
5: See A. (7.) of this permit.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NCO024112 '
A. (2.) INSTREAM MONITORING REQUIREMENTS
(a) Beginning on the effective date of this permit and lasting through the expiration date, the
Permittee shall perform instream sampling upstream and downstream of Outfall 001 as specified
below, unless exempted per paragraph (b) below:
PARAMETERS
SAMPLE TYPE
MONITORING FREQUENCY
SAMPLE
LOCATION tt>
Jun I - Sep 30
Oct 1- May 31
Temperature
Surface
3/week
Weekly
U, D
Dissolved Oxygen
Surface
3/week
Weekly
U, D
Fecal Coliform
(geometric mean)
Surface
3/week
Weekly
U, D
Conductivity
Surface
3/week
Weekly
U, D
Total Phosphorus
Surface
Monthly
Monthly
U, D
TKN
Surface
Monthly
Monthly
U, D
NH3-N, as N
Surface
Monthly
Monthly
U, D
NO2-N + NO3-N
Surface
Monthly
Monthly
U, D
Chlorophyll -a
Surface
Monthly
Monthly
D
Footnotes: .
(1) Sample locations: U - Upstream at Baptist Children's Home Road, D - Downstream at SR
2017 and pn Abbotts Creek at Center Street below the confluence with Leonard Creek.
(b) Coordinated Instream Monitoring Program, Yadkin -Pee Dee River Basin Association. The
Permittee shall be provisionally exempted from the instream monitoring requirements specified in
paragraph (a) above, so long as the Permittee remains a party in good standing in an active
instream monitoring Memorandum of Agreement signed with the Division. If the Permittee's
participation in the MOA is terminated, the requirements in paragraph (a) shall be reinstated
immediately and automatically.
(c) Notification of Terminated Membership. If the Permittee's participation in the MOA is
terminated for any reason, the Permittee shall notify the Division in writing within five (5)
working days, unless the termination is initiated by the Division.

Permit NCO024112
A..(3.) TOTAL PHOSPHORUS MONITORING
The Permittee shall calculate the seasonal mass loading of total phosphorus as the sum of monthly loadings,
according to the following equations:
(a) Monthly Mass Loading (pounds/month) = TP x Q x 8.34
where: TP = the average total phosphorus concentration (mg/L) of the
composite samples collected during the month
Q = the total volume of wastewater discharged during the month at
each outfall (MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
(b) Seasonal Mass Loading (pounds/season) _ (Monthly Mass Loadings) for the
season
The Permittee shall report the total phosphorus cc
loading in the appropriate self -monitoring report and
final self -monitoring report for the season.
lcentration for each sample and the monthly mass
the seasonal mass loading of total phosphorus in the
A. (4.) 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 90.0% .
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 February, May, August
and November. 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 Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621

Permit NCO024112
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.
If the Perrnittee monitors any pollutant more frequently then required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT
Forms submitted.
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. (5.) NON -DETECTION REPORTING AND DETERMINATION OF COMPLIANCE
When pursuant to this permit a pollutant analysis is conducted using an approved analytical protocol with
the appropriate minimum detection level and a result of "non -detectable" or "below quantitation limit" is
obtained, the Permittee shall record that result as reported. For the purpose of determining compliance with
a permit limit for the pollutant, the numerical value of that individual analytical result shall be zero.

Permit NCO024112
A. (6.) 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-dichloroethyle'ne
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable c�mrnds:
Diethyl phthalate
Mercury
P-chloro-m-cresol
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic camboundi:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
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:
NC DENR / DWQ / Central Files
1617 Mail Service Center
Raleigh, N.C. 27699-1617.

Chernikov, Sergei
From: Conder, Misty [[e-mail]]
Sent: Friday, May 22, 2009 11:37 AM
To: Chernikov, Sergei
Subject: RE: NPDES permit
Attachments: ZincCopper response letter 2007 - revl .doc; Copper Zinc TIE response 1-31-08.doc
Dear Mr. Chernikov,
I've attached copies of the letters that were sent in response to the TIE. One by Morgan Huffman, superintendent in
November 2007 and one that I followed up with in January after I took over. It should also be noted that there have
been no further failures of our WET tests since that time period.
in addition to the copper -zinc issue, the City has a couple of requests regarding the permit renewal. First, please update
the permit to include only the information for the 6.0 MGD plant. A statement of completion was sent to the State. In
addition, we have been operating the 6.0 MGD plant equipment since March 11, 2008, with the exception of the. ,
cannibal equipment which came online completely in February 2009. There are no primaries, or trickling filters, or,;
communituters in the new plant, so we can't maintain those. We would also respectfully request the removal of
chlorine limits and monitoring requirements entirely since this is a UV disinfection plant now. We do not add chlorine or
bleach to any of the treatment processes.
Thank you for your consideration of our request. If you have any further questions regarding the copper -zinc please give
me a call.
Leigh "Misty" Conder
From: Chernikov, Sergei[mailto:[e-mail]] _ ..,.
Sent: Thursday, May 21, 2009 12:16 PM Y.: :.. ;
To: Conder, Misty
Subject: NPDES permit
Ms. Conder,
I have received a question from EPA in regard to the Draft NPDES permit, please see bellow. I was wondering if you
could answer this question.
Thank you!
Sergei
In reviewing the fact sheet's reasonable potential assessment for copper and zinc and the
facility's WET DMR results, there were consecutive chronic WET failures in August and
September 2007. Our files contain a copy of an 11/28/07 letter from NC to the facility
indicating that the facility must decide by 1/2/08 whether to accept copper and zinc limits
or pursue alternatives based on these WET failures. We have no record of what the facility
decided.
Sergei Chernikov, Ph.D.
Environmental Engineer II
NPDES-West
Phone: [phone], fax [phone]
1617 Mail Service Center
1

Raleigh, NC 27699-1617
Express mail: 512 North Salisbury St.
Raleigh, NC 27606
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
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