NC0024147_Modifications IUP 000033_20220322

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WASTEWATER MANAGEMENT FACILITY
Sarah Jordan
Pretreatment Coordinator
[e-mail]
Phone:[phone]
March 21, 2022
Mr. Keyes McGee RECEIVED
Department of Water Quality, PERCS
1617 Mail Service Center MAR 2 3 2022
Raleigh,NC 27699-1617
NCDEQIDWRINPDES
Subject: Permit Modifications for IUP 000013, IUP 000033, and IUP 000041
Dear Mr. McGee:
The City of Sanford is submitting modified IUPs 000013,000033,and 000041. Modifications are as
follows for each IUP.
• IUP 13: The TTO Sampling requirement for the City was changed to"1 per 12 months
providing the certification is not submitted"to align with other IUPs on the pretreatment
program.
• IUP 33: Changed the pipe 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.
• IUP 41: I fixed typographical error in flow limits from 0.5 MGD daily max to 0.05 MGD
monthly average and removed COD monitoring.
Attached is a copy of each modified permit,copies of each of the transmittal letters, and an updated
allocation table.
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

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P.0.Box 3729 PHONE[phone]
Sanford,NC 27330 Fax [phone]
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SARAH JORDAN
Pretreatment Coordinator
[e-mail]
WASTEWATER MANAGEMENT FACILITY
March 21,2022
Mark Cauthen
EHS Associate
Caterpillar Inc.
5000 Womack Road
Sanford,NC 27330
Subject:Transmittal Letter for Ind
ustrial dustnal User Permit#000033 (Womack Facility)
Dear Mr. Cauthen:
Enclosed is modified Industrial User Permit 000033.Changes are as follows:
1. The daily maximum flow limit on pipe 02 has been increased from 0.0373 MGD to 0.044 MGD
to accommodate for increased production and employees.
2. The COD monitoring requirement on pipe 02 has been removed.
3. On pipe 01 the TTO sampling requirement for the POTW has been clarified.
The modified pages included are page 1-7. 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 anyparts
(measurement frequencies,sampling requirements,and/or limits)contained in this permit are
unacceptable to you,you have the right to an adjudicatory hearing 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
Carom Authority artdla rr,tapalty
PERMIT
Industrial User Pretreatment Permit(IUP)
To Discharge Wastewater Under the
Industrial Pretreatment Program
000033 433
IUP Number 40 CFR CMagart(f Applicable)
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,permittee:
CATERPILLAR PAINT&PLATING OPERATIONS
Facility Located at Street Address
5000 Womack Road
City
Sanford
State,Zip
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 ardlar Niinic pality VMTP name:
City of Sanford Big Buffalo Creek WWTP
NPDES Number:
NC 0024147
WWTP 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 permit and the authoriation to discharge shah became
effective at midnight on this date:
March 21, 2022
Expiration date,this permit and the authorization to discharge shall expire at
midnight on this date:
September 30, 2024
tote Di Public 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&WWII)name: POTW NPDES#
City of Sanford Big Buffalo WWTP NC 0024147
IUP Name: IUP Number:
Caterpillar Paint&Plating Operations 000033
IUP Effective date: Pipe Numbers,list all regulated pipes:
March 21, 2022 Pipe 01 &02
• IUP Expiration date: IUP 40 CFR#(if applicable),or N/A
September 30,2024 433
B. IUP History.
Effective Date Renewal or Modification Description of changes over previous RIP.
9/30/09 Renewal Changed flow limit,dropped NH3 limit,added parameters found in discharge
above detection limit and parameters required for LIMP,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 IOP 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/l8 Modification Change the IO treatment units due to a removal of a filter press from the wash
hay.
09/30/19 Renewal Permit renewed until 2024.
7

Industrial User Pretreatment Permit (IIJP)
PART I
Specific Conditions
L13/21/22 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 PDTW. Clarified the City's TTO requirement on pipe 01 to
align with the rest of IUPs on the pretreatment program.
C.) Authorization Statement:
1.) 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 authorized 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 Unds 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- 10.D00 gal.Unit that neutralize G precipitate metals
Neutralize, pH Adjust 2-Addition of Caustic 6 Acids far pH control
Sedimentation 2-Tanks used to settle solids
Spill Protection Dikes to contain unit overflows.
Flow Measurement Recording effluent flow meter
Automatic Samplers How proportional samplers
Clarifier Settling tank
Filter Press I press for wastewater paint system
Grease Trap Removal of grease from cafeteria discharge
Grit Removal Settling and Grit removal from wash pits
Oil/Water Separator Tank for oil removal prior to discharge
3

Industrial User Pretreatment Permit (IUP)
PART I
Specific Conditions
3.) The Permittee is hereby authorized to, if required by the Control Authority
and/or Municipality and after receiving Authorization to Construct (A to C)
from the Control Authority and/or Municipality, construct and operate
additional pretreatment units as needed to meet final effluent limitations.
D.) Description of IUP Discharge(s):
1. Describe the discharge(s) from all regulated pipes.
Pipe#01,Description of Discharge: Discharge consists of steam boiler blow down,air
compressor receiver tank condensate,air dryer condensate,laboratory sink,and process
wastewater.
Pipe # 02, Description of Discharge: Discharge consists of flow from pretreatment units,
bathrooms,hand washing sinks,cafeteria,mop and cleaning water,and non-contact cleaning
water.
4

Industrial User Pretreatment Permit OUP)
PART I
Specific Conditions
E.) Monitoring Locations and Schematic:
The sampling point for Pipe 01 shall be in the electroplating and painting pretreatment room
in the effluent pipe of the final discharge tank.
The sampling point for Pipe 02 shall be in the manhole just outside the parking lot.
;M AT -o OAK PARK ROAD .
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5

Receiving POTW name => Big Buffalo WWTP IU name => Caterpillar Paint& Plating Operations
IUP, Part 1 Section F: Receiving POTW NPDES#_> NC 0024147 IUP#_> 000033
Effluent Limits and Monitoring Requirements Effective date for these Limits=> March 2I,2022 Pipe#=> 01
Expiration date for these Limits=> September 30,2024 40 CFR#_> 433
The Permittee may discharge from this specific if not applicable put N/A
THE LIMITS ON THIS PAGE ARE,(Check one below):
Pipe number according to these specific dates, LIMITS for ENTIRE permit period => X
effluent limits, and monitoring requirements INTERIM Limits for period# t =>
INTERIM Limits for period#2 =>
FINAL Limits Page =>
ll
Concentration Limits Monitoring Frequency
i Required
' Sample Laboratory
Collection Detection
' Daily Method Level in
Max Units By Industry By City (C or G) mg/1
I Flow MGD Daily k Each Composite Sampling Event Each Composite Sampling Event Metered (
2 Arsenic mg/I 1 per six months Composite .005
3 Cadmium 0.05 mg/I ] per six months
� 4 per six months Composite .002
4 Chromium 1.50 mg/I 4 per six months Composite .005
5 Copper 1.42 mg/I
4 per six months Composite 005
7
Cyanide 0.15 mg/I 4 per six months I per six months Grab .01
8 Lead 0.30 mg/I 4 per six months Composite .005
9 Mercury mg/I 2per six months
g Composite .0002
10 Nickel � 1.00 mg/I 4 per six months Composite .005
I I pH(Range Min./Max.) 6.0-10.5 Std.Units _ 4sixths Grab Std. Units
12 phenol f
per months
mg/I 1 per six months Grab .01
13 Silver 0.24 mq/I
14 0 4 per six months Composite .005
Temperature 66 C 4 per six months Instantaneous oC
15 TTO 2.13 mg/I 1 per six months I per twelve months providing the certification is not I Grab .01
submitted
16 Xylene mg/I 1 per six months Grab ,01
17 Zinc 1.24 mg/I 4 per six months Composite 0.01
18
19
6

IUP, Part 1 Section F: Receiving POTW name => Big Buffalo WWTP lUname => Caterpillar Paint& Plating Operations
Effluent Limits and Monitoring Requirements Receiving POTW NPDES#=> NC 0024147 IUP#=> 000033
Effective date for these Limits=> March 21,2022 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
THE LIMITS ON THIS PAGE ARE,(Check one below):
effluent limits, and monitoring requirements
LIMITS for ENTIRE permit period => X
INTERIM Limits for period# 1 =>
INTERIM Limits for period#2 =>
FINAL Limits Page =>
Concentration Limits Monitoring Frequency
Required
Sample Laboratory
Collection Detection
Daily Method Level in
Max Units By Industry By POTVv' (C or G) mg/1
1 Flow .044 MOD Daily&Each Composite Sampling Event Each Composite Sampling Event Metered
2 Ammonia mg/I !per six months Composite 0.1
3 CBOD-5 mg/I 4 per six months Composite 2.0
4 Molybdenum mg/I 1per six months Composite 0.1
5 Oil& Grease mg/1 4 per six months I Grab 5.0
6 pH(Range Min./Max) 6.0-10.5 Std. Units 1'
4 per six months Grab
7 Selenium mg/I . I per six months Composite 0.01
8 Temperature 66 °C 4 per six months Instantaneous
9 Total Nitrogen (NO2+NO3+TKN) mg/I 1 per six months Composite 0.5
10 Total Phosphorous mg I 1 per six months Composite 0.1
11 TSS mg/1 4 per six months I Composite 2.5
I 1
7