NC0024147_Modifications IUP (000033)_20220729

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PO Box 3729 Phone[phone]
Sanford,NC 27330 City of fp a n f o r b Fax [phone]
WASTEWATER MANAGEMENT
FACILITY
Sarah Jordan
PRETREATMENT COORDINATOR
July 26,2022
Mr. Keyes McGee ECEVED
Department of Water Quality,PERCS
1617 Mail Service Center JUL 2 9 2QZZ
Raleigh,NC 27699-1617
R CDEQIDWRINPDES
Subject: Permit Modifications for IUP 000033 and IUP 000040
Dear Mr. McGee:
The City of Sanford are submitting modifications for IUP 000033 (Caterpillar Paint&
Plating Operations)and IUP 000040 (Caterpillar Inc.). The modification are as follows:
• IUP 000033: Pipe 02 flow limit went from a daily maximum of 0.044 MGD to a
monthly average of 0.044 MGD.
• IUP 000040:Pipe 01 flow limit went from a daily maximum of 0.027 MGD to a
monthly average of 0.027 MGD. The pipe 02 flow limit went from a daily maxi-
mum of 0.0373 MGD to a monthly average of 0.0373.
Changing the flow limits to monthly averages as opposed to daily maximums more accu-
rately depicts both facilities batch processing practices.
Attached are copies of the modified permits and copies of their respective transmittal let-
ters. The allocation table has not changed in reference to these modifications.
If there are questions or comments,please feel free to contact me at(919)777-1783.
Sincerely,
Sarah Jordan
Pretreatment Coordinator
City of Sanford
Enclosures

PO Box 3729
San rsi,NC 27330f t Phone[phone]
it n f o r h Fax (919)77e-5037
''` -- - : �•` WASTEWATER MANAGEMENT ^-
FACILITY
Sarah Jordan
PRETREATGiEF:r COORDINATOR
July 26,2022
Mark Cauthen
EFTS Associate
Caterpillar Inc.
5000 Womack Road
Sanford,NC 27330
Subject:Transmittal Letter for Industrial User Permit#000033 (Womack Facility)
Dear Mr.Cauthen:
Enclosed is modified Industrial User Pennit 000033.Changes are as follows:
I_ The daily maximum flow limit on pipe 02 has been changed to a monthly aver-
age of 0.044 MGD to accommodate batch processing.
The modified pages(1,2,3,and.7)are included Please add these modified pages to your
current IUP.Remove the former pages and place them in a separate"historical"file and
retain them for future reference.
Please read this permit carefully,paying special attention to the changes referenced
above.if any parts(measurement frequencies,sampling requirements,and/or limits)con-
tained in this permit are unacceptable to you,you have the right to an adjudicatory hear-
ing upon written request within thirty(30)days following the receipt of this letter. Unless
such demand is made,this decision shall be final and binding.
Sincerely,
Sarah Jordan
Pretreatment Coordinator
City of Sanford

•
CITY OF SANFORD
Control Authority and/or Municipality
PERMIT
Industrial User Pretreatment Permit(IUP)
To Discharge Wastewater Under the
Industrial Pretreatment Program
000033 433
IUP Number 40 CFR Categwy('dApplicable)
In compliance with the provisions of North Carolina General Statute 143 215.1, any
applicable federal categorical pretreatment regulations, all other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Control Authority and/or Municipality Sewer Use Ordinance. The
following Industry hereafter referred to by name or as the permittee:
Industry name,permrittee:
CATERPILLAR PAINT&PLATING OPERATIONS
Fealty Located at Street Address
5000 Womack Road
City
Sanford
State~Z9
North Carolina 27330
is hereby authorized to discharge wastewater from the facility located at the above listed
address into the sanitary sewer collection system and the wastewater treatment facility of
the Control Authority and/or Municipality listed below:
IUP Control Authority and/or blteticipatilyINWIP name:
City of Sanford Big Buffalo Creek WWTP
NPDES Number.
NC 0024147
W WtP Address:
5327 Iron Furnace Road
City,State,Zip
Sanford,North Carolina.27331-3729
in accordance with effluent limitations,monitoring requirements, and all other conditions
set forth in Parts I,II,and III of this Industrial User Pretreatment Permit(IUP).
Effective date,this permt"t and the authorization to discharge shall become
effective at midnight on this date:
August 1, 2022
Exp atiun date,this permit and the authorization to discharge shall expire at
midnight on this date:
September 30, 2024
DZ. DZ., L
Date signed Director of lic Works

Industrial User Pretreatment Permit(IUP)
PART I
Specific Conditions
IUP,PART I, OUTLINE:
A.) IUP Basic Information
B.) IUP Modification History
C.) Authorization Statement
D.) Description of Discharges
E.) Schematic and Monitoring Locations
F.) Effluent Limits&Monitoring Requirements
G.) Definitions and Limit Page(s)notes
A. IUP Basic Information:
Receiving Control Authority&WWTP name: POTW NPDES#
City of Sanford Big Buffalo WWTP NC 0024147
IUP Name: IUP Number:
Caterpillar Paint&Plating Operations 000033
RIP Effective date: Pipe Numbers,fist all regulated pipes:
August 1,2022 Pipe 01 &02
IUP Expiration date_ IUP 40 CI,R#(if applicable),or N/A:
September 30,2024 433
B. IUP history.
Effective Renewal or Description of changes over previous BUP.
Date Modification
9/30/09 Renewal Changed flow limit,dropped NH3 limit,added parameters found in
discharge above detection limit and parameters required for LTMP,deleted
duplicate parameter from pipe 02.
12/1/09 Modified Increased Ni limit,changed wording for flow monitoring requirements,
changed Zn&Cd detection limit,and dropped Zn from industry's
sampling requirements.
4/1/2010 Modified Changed the monitoring requirement for Hg from a grab sample to a
composite sample and removed PERCS guidance from the IUP history.
2/22/2011 Modified Changed the detection level for TSS.
09/30/2014 Renewal Permit Renewal.Bottom pH limit increased to 6.0 to comply with WWTP
standard limits.
3/8/16 Modification Changed cyanide monitoring frequency to"1 per six months"for the City
of Sanford POTW.
1/29/18 Modification Fixed typographical error on pipe 02 to have lower pH limit as 6.0.
06/06/18 Modification Change the IU treatment units due to a removal of a filter press from the
wash bay.
09/30/19 Renewal Permit renewed until 2024.
2

Industrial User Pretreatment Permit(IUP)
PART I
Specific Conditions
03/21/22 Modification Changed 02 flow limit from 0.0373 MGD to 0.044 MGD due to an
employee and production increase.Also removed the COD monitoring
requirement on pipe 02 for the City of Sanford POTW. Clarified the City's
TTO requirement on pipe 01 to align with the rest of IUPs on the
pretreatment program.
8/1/22 Modification
Pipe 02 flow limit has been changed from a daily maximum
limit of 0.044 MGD to a monthly average of 0.044 MGD to
accommodate their batch process and more accurately depict
representative flow.
C.) Authorization Statement:
I.) The Permittee is hereby authorized to discharge wastewater in accordance with
the effluent limitations, monitoring requirements, and all other conditions set
forth in this Industrial User Pretreatment Permit(IUP)into the sewer collection
system and wastewater treatment facility of the Control Authority and/or
Municipality.
2.) The Permittee is hereby alit orized to continue operation of and discharge
wastewater from the following treatment or pretreatment facilities. These
facilities must correspond to the treatment units listed on both the application
and inspection forms.
IU Treatment Units
List all Treatment item Descriptions:
Chemical Precipitation 2-Hydroxide Precipitation of the Metals
Filtration Sand filter
Flocculation 2-Addition of anionic polymers to precipitate the solids
Flow Equalization 2-1D.ODD gal.Unit that neutralize fi precipitate metals
Neutralize,pH Adjust 2-Addition of Caustic fi Acids for pH control
Sedimentation 2-Tanks used to settle solids
Spill Protection Dikes to contain unit overflows.ws.a
Flow Measurement Recording effluent flow meter
Automatic Samplers flow proportional samplers
Clarifier Settling tank
Filter Press I press for wastewater paint system
1 Grease Trap Removal of grease from cafeteria discharge
Grit Removal Settlingand Grit removal from wash pits
Oil!Water Separator Tank for oil removal prior to discharge
3

IUP, Part 1 Section F: Receiving POTW name => Big Buffalo WWTP III name=> Caterpillar Paint&Plating Operations
Effluent Limits and Monitoring Requirements Receiving POTW NPDES#_> NC 0024147 IUP#_> 000033
Effective date for these Limits=> August 1,2022 Pipe#_> 02
The Permittee may discharge from this specific Expiration date for these Limits=> September 30,2024 40 CFR#=> 433
Pipe number according to these specific dates, if not applicable put N/A
effluent limits, and monitoring requirements THE LIMITS ON THIS PAGE ARE,(Check one below):
LIMITS for ENTIRE permit period => X
INTERIM Limits for period# I =>
INTERIM Limits for period#2 =>
FINAL Limits Page =>
Concentration Limits Monitoring Frequency
Required
Sample Laboratory
Collection Detection
Daily Monthly Method Level in
Max Average Units By Industry By POTW (C or G) mg/1
1 Flow 0.044 MGD Daily&Each Composite Sampling Event Each Composite Sampling Event Metered
2 Ammonia mg/1 1 per six months Composite 0.1
3 CBOD-5 mg/1 4 per six months Composite 2.0
4 Molybdenum mg/1 1 per six months Composite 0.1
5 Oil&Grease mg/I 4 per six months Grab 5.0
6 pH(Range Min./Max.) 6.0-10.5 Std.Units 4 per six months Grab
7 Selenium mg/1 1 per six months Composite 0.01
8 Temperature 66 °C 4 per six months Instantaneous
9 Total Nitrogen (NO2+NO3+TKN) mg/1 1 per six months Composite 0,5 '
10 Total Phosphorous mg/1 1 per six months Composite 0,1
11 TSS mg/1 4 per six months Composite 2.5
0
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