NC0047384_Pretreatment_IUP_PGSwing_Renewal_20240509

CITY OF GREENSBORO
WATER RESOURCES DEPARTMENT
INDUSTRIAL WASTE SECTION
SIGNIFICANT INDUSTRIAL USER
WASTEWATER DISCHARGE PERMIT
SIU PERMIT NUMBER P005
THE PROCTER & GAMBLE MANUFACTURING COMPANY
IS AUTHORIZED TO DISCHARGE WASTEWATER
FROM A FACILITY LOCATED AT
100 SWING ROAD
GREENSBORO, NORTH CAROLINA
into the City of Greensboro Sanitary Sewer System
to the T.Z. OSBORNE Water Reclamation Facility
[NPDES PERMIT NUMBER NCO047384]
in accordance with the limitations and conditions set forth in this permit.
This permit shall become effective
SEPTEMBER 1, 2023
This permit and the authorization to discharge shall
expire at midnight on
AUGUST 31, 2028
or upon permit reissuance, whichever comes first.
fio. un"'�Qt"" 9/y/
Amy Va#noski Date
Pretreatment Coordinator

Page 2, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
INDUSTRY OFFICIAL RESPONSIBLE FOR PERMIT COMPLIANCE
This signatory official shall be responsible for permit compliance, including monitoring, report
submittals, accidental discharge notification, and permit renewal. Although certain of these
activities may be delegated to other individuals, the Signatory Official is ultimately responsible
for compliance with all permit conditions, limits, activities and terms.
I am aware of my responsibilities as Signatory Official and I am aware of the terms and
conditions set forth in this wastewater discharge permit and the City of Greensboro Sewer Use
and Pretreatment Ordinance.
Signatory Official NAME (PLEASE PRINT)
Signatory Official TITLE (PLEASE PRINT)
Signatory Official Signature
Date:
CHANGE OF SIGNATORY OFFICIAL
If there is a change of the Signatory Official for this facility, the City of Greensboro shall be
notified of such change within thirty (30) days. A new page 2, "INDUSTRY OFFICIAL
RESPONSIBLE FOR PERMIT COMPLIANCE" shall be submitted to the Industrial Waste
Section with the name, title and signature of the new official.
September 1, 2023 Permit Renewal

Page 3, SIU Permit#P005
PROCTER& GAMBLE— SWING RD
Effective September 1, 2023
SECTION I— PERMIT MODIFICATION HISTORY
DATE MODIFIED REASON & DESCRIPTION OF MODIFICATION OR ACTION
September 1, 1998 PERMIT RENEWAL
February 9, 2000 Change in sampling location and type of sample collected from composite
to grab
September 21, 2001 New Pharmaceutical Manufacturing Categorical Effluent Limitations
Added [40 CFR Part 439.36 and 40 CFR Part 439.46]
Slurries were included in the P&G—Swing Rd.permit and should have
been included in P&G Brown Summit Permit instead. Page 3A -
September 28, 2001 Description of Discharge Pipe 01 —Process Wastewater from cleaning,
equipment use, and facility wash down from personal care and
pharmaceutical product manufacturing
Include submittal dates for self-monitoring: Samples for Jan 1-Jun 30
shall be taken in months Jan., Feb., and/or March and compliance report
July 1, 2002 submitted on or before Apr. 20th of each year. Samples for Jul. 1-Dec. 31
shall be taken in months Jul., Aug., and/or Sept. and compliance report
submitted on or before Oct. 201h of each year.
October 10, 2002 Installation of Effluent Meter (page 5) —Flow readings for compliance
are to be obtained from effluent meter in lieu of incoming meter (City)
PERMIT RENEWAL
September 1, 2003 Facility cannot discharge during a power outage. Pumps automatically
shut off. Under Section IV. A. 10. — The requirement for a backup
battery/generator has been deleted
September 1, 2007 Flow Increase—Due to change in how products are produced for
customers
PERMIT RENEWAL
Page 5, Section III. —Reduced Daily Maximum flow limit of 200,000 gpd
to Monthly Average limit of 100,000 gpd; Page 6, Section III. —Reduced
Daily Maximum cyanide limit to 0.100 mg/L based on the facility's
historical data; Page 7, Section IV.A.3. —Incorporated requirement to
submit flow data by the 15th for the previous month's readings; Section
IV.A.4. — Clarified reporting periods for meter calibration; Section
September 1, 2008 IV.A.5. —Included additional POTW contact information; Section IV.A.6.
— Updated Water Resources Customer Service contact information; Page
8, Section IV.B. —Modification of Annual Chemical Analysis
Reconfirmation statement; Page 8&9, Section IV.C. —Modified language
regarding alternate test methods & incorporated requirement of semi-
annual certification statement for pollutants not present; Page 10, Section
IV..D. -Modified perm ittee sampling requirements and due dates and
incorporated requirement to submit written notice of zero discharge for a
reporting period.
September 1, 2023 Permit Renewal

Page 3A, SIU Permit#P005
PROCTER& GAMBLE- SWING RD
Effective September 1, 2023
SECTION I — PERMIT MODIFICATION HISTORY
DATE MODIFIED REASON & DESCRIPTION OF MODIFICATION OR ACTION
February 18, 2009 Cooling Tower and boiler blow down dilution wastestream removed from
Pipe 01 in Section II.A. Description of Discharge (pg. 4)
Permit Modification
1) Page 5 and 6, Section III-Changed minimum sampling requirement for
City to 1/year. 2) Page 6, Section IV.A.4.- changed effluent meter
July 1, 2011 calibration requirement from once per six-month period to once a
calendar year; 3) Page 6, Section IV.A.5. and 6. - deleted names from
permit and included the position titles only; 4) Page 10, Section IV.D. -
Report Submittal date changed to 15th in lieu of 20th
Permit transferred to TEVA Pharmaceuticals USA, Inc. New owner has
November 1, 2011 confirmed that all products and processes will remain unchanged
throughout the duration of this permit.
PERMIT RENEWAL
Section III- City monitoring frequency set to 116 months; Removed
September 1, 2013 Methyl Cellosolve limit and monitoring; Section IV. -Added Special
Condition G (Slug/Spill Control Plan)per DWQ guidance; Reordered
Special Conditions; Corrections to Special Conditions; Added Special
Condition H Cyanide Certification
Permit transferred to The Procter & Gamble Manufacturing Company.
July 1, 2014 New owner has confirmed that all products and processes will remain
unchanged throughout the duration of this permit.
Permit Modification
September 28,2016 Removed SIUself-monitoringfor Zinc and Total Suspended Solids based
on data obtained.
PERMIT RENEWAL
Special Conditions Changes: Added Flow Measurement Calibration/
September 1, 2018 Verification Section; Modified Flow Language; Modified Cyanide
Certification language; Modified Annual Chemical Reconfirmation
Analyses language.
PERMIT RENEWAL
September 1, 2023 Increased 6-month average flow limit from 100,000 gpd to 125,000 gpd
based on addition of new product line
September 1, 2023 Permit Renewal

Page 4, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
SECTION II - GENERAL INFORMATION
A. Description of Discharge
Pipe 01 —Process Wastewater from cleaning, equipment use, and facility wash down from
personal care and pharmaceutical product manufacturing
Pipe 01 does not include domestic waste discharge.
B. 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 City of Greensboro
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.
Flow Equalization Basin
Neutralization, pH Adjustment
3. The permittee is hereby authorized to, if requested by the City of Greensboro and after
receiving Authorization to Construct (A to C) from the City of Greensboro, construct and operate
additional pretreatment units as needed to meet final effluent limitations.
C. Monitoring Location
Sampling building next to Parshall flume located adjacent to the retention basin on the west side
of P&G building
D. Composite Sampling Technique
Pharmaceutical Categorical regulated parameters shall be taken cis grab samples.
A composite sample for the purposes of this permit is:
A Flow Proportional Composite sample taken over the entire workday by an automatic sampler
interfaced with the effluent flow meter.
September 1, 2023 Permit Renewal

Page 5, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
SECTION III - EFFLUENT LIMITS AND MONITORING REQUIREMENTS
Effluent Limits and Monitoring Requirements for Pipe 01
THIS FACILITY IS REGULATED BY THE FEDERAL CATEGORICAL
PRETREATMENT STANDARDS FOR PHARMACEUTICAL MANUFACTURING
[40 CFR 439.36 Subpart C - Chemical Synthesis]
[40 CFR 439.46 Subpart D - Mixing/Compounding]
EFFLUENT LIMITATIONS MONITORING FREQUENCY
EFFLUENT Daily 6- Month Sample CITY OF
CHARACTERISTICS Maximum Average Type PERMITTEE GREENSBORO
Flow (gallons per day) 125,000 # DAILY
H standard units 5.0— 12.0 Grab 1/6 months
BOD++ m /1 M C 1/6 months
Suspended Solids++ m /1 M C 1/6 months
Cadmium T m /1 M C 1/6 months
Chromium T m /1 M C 1/6 months
Copper T m /1 M C 1/6 months
Lead T m /1 M C 1/6 months
Nickel T m /1 M C 1/6 months
Zinc T m /1 M C 1/6 months
Silver T) m /1 M C 1/6 months
Selenium T m /1 M C 1/6 months
ALL METALS ARE TO BE ANAL YZED AS TOTAL
#The Greensboro Industrial Waste Section does not consider flow to be a pollutant and
flow data is not considered a report.
++ALL BOD CONCENTRATIONS OVER 200 mg/1 AND ALL TOTAL SUSPENDED
SOLIDS CONCENTRATIONS OVER 200 mg/l ARE SUBJECT TO AN INDUSTRIAL
WASTE SURCHARGE
C - Composite Sample [See Section II Part D for permit-specific definition]
G - Grab Sample
M- Monitoring Only [See Local Pollutant Allocation Document to determine if an
Allocation has been issued for this parameter]
September 1, 2023 Permit Renewal

Page 5A, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
SECTION III — EFFLUENT LIMITS AND MONITORING REQUIREMENTS
Effluent Limits and Monitoring Requirements for Pipe 01
THIS FACILITY IS REGULATED BY THE FEDERAL CATEGORICAL
PRETREATMENT STANDARDS FOR PHARMACEUTICAL MANUFACTURING
[40 CFR 439.36 Subpart C - Chemical Synthesis]
40 CFR 439.46 Subpart D - Mixin /Com oundin
EFFLUENT EFFLUENT LIMITATIONS m /1 MONITORING FREQUENCY
CHARACTERISTICS Daily Monthly 6-Month Sample PERMITTEE CITY OF
Maximum Average Average Type GREENSBORO
Cyanide (total)A 0.10 Grab ^ see note 1/ ear
Acetone 20.7 8.2 Grab 1/6 months 1/ ear
4-Methyl-2-pentanone
(MethylIsobutyl M Grab 1/yr.***
Ketone
Isobutyraldehyde M Grab 1/ r.***
n-Am l acetate M Grab 1/ r.***
n-Butyl Acetate M Grab 1/ r.***
Ethyl acetate M Grab 1/ r.***
Isopropyl acetate M Grab 1/ r.***
Methyl formate M Grab 1/ r.***
Isopropyl ether M Grab 1/ r.***
Tetrah drofuran M Grab 1/ r.***
Benzene M Grab 1/ r.***
Toluene M Grab 1/ r.***
X lenes M Grab 1/ r.***
n-He tane M Grab 1/ r.***
n-Hexane M Grab 1/ r.***
Methylene Chloride M Grab 1/ r.***
Chloroform M Grab 1/ r.***
1,2-Dichloroethane M Grab 1/ r.***
Chlorobenzene M Grab 1/ r.***
o-Dichlorobenzene M Grab 1/ r.***
Diethyl amine M Grab 1/yr.-k**
Trieth 1 amine M Grab 1/ r.***
***See Section IV.- Special Permit Conditions - Annual Chemical Analysis Reconfirmation
^ See Section IV.- Special Permit Conditions - Cyanide Certification
C - Composite Sample [See Section II Part D for permit-specific definition]
G - Grab Sample
M- Monitoring Only [See Local Pollutant Allocation Document to determine if an
Allocation has been issued for this parameter]
September 1, 2023 Permit Renewal

Page 6, SIU Permit#P005
PROCTER& GAMBLE— SWING RD
Effective September 1, 2023
SECTION IV - SPECIAL PERMIT CONDITIONS
A. FLOW MEASUREMENT
Compliance with the flow limit in this permit shall be documented in the following manner:
1. The Permittee shall provide and maintain a refrigerated composite sampler and primary flow
measurement device for flow proportional sampling and flow measurement of the permittee's
process wastewater discharge.
2. The effluent process flow meter readings shall be recorded daily and the daily effluent flow
calculated in gallons per day. Flow measurement records shall be submitted to the City of
Greensboro Industrial Waste Section monthly. Data is to be submitted by the 15th of each
month for the previous month's flow measurements.
3. The permittee shall maintain permanent flow records and maintenance and calibration records
on-site for a minimum of three years. These records shall be available to the City of
Greensboro Industrial Waste Section during inspections or upon request.
4. Immediate notification, within 24 hours of becoming aware of the problem, shall be provided
to the Pretreatment Coordinator [336-433-7227] or Pretreatment Compliance Specialist [336-
373-3285] by phone or e-mail for any periods in which the effluent meter is inoperable with
the exception of periods for maintenance/calibration. This notification shall include the
cause of the malfunction/failure, anticipated repair time and/or plan of action to allow the
permittee to comply with the requirement to record the flow meter readings daily.
5. Malfunction/failure of effluent flow meters that are used for sewer billing purposes shall also
be immediately reported, within 24 hours of becoming aware of the problem, to the Water
Resources Customer Service Division by phone---Assistant Manager [336-373-4108] or
Manager [336-373-2639]. Failure to do so will result in the Industrial Waste Section and the
Water Resources Customer Service Division reverting back to the incoming Vvater meter to
determine compliance and billing.
6. The wastewater meter must have a non-resettable totalizer that reads in cubic feet or gallons.
There shall be no by-pass capability of the wastewater metering devices and monitoring
point(s).
7. If the wastewater meter is being used for billing or compliance, it must have permanent flow
records (i.e. strip chart recordings) that include at minimum the following basic information:
date, time, totalizer reading (with units), interval flow volume(with units), maximum flow
rate (with units), and primary measuring device type. Any interruption in such records with
the exception of periods for maintenance/calibration are a violation of this permit and may
result in a civil penalty each day the interruption is allowed to continue.
September 1, 2023 Permit Renewal

Page 7, SIU Permit#P005
PROCTER& GAMBLE— SWING RD
Effective September 1, 2023
8. The wastewater meter shall have a back-up power source (battery or generator)to ensure
uninterrupted measurement of the discharge flow in the event of a power failure unless loss
of power automatically prevents any discharge from the facility. The back-up source shall
provide power to the wastewater meter's sensor and permanent flow records for a minimum
of 12 hours.
B. ANNUAL CHEMICAL ANALYSIS RECONFIRMATION
An annual chemical analysis [for all pollutants regulated under 40 CFR Part 439.36 and 439.46]
of wastewater from the effluent sample location must be performed yearly to reconfirm the
absence of a pollutant. In order to reconfirm the absence of a pollutant,the chemical analysis
must show that the pollutant is less than the detectable value of the certified lab. In the event that
a certified parameter is detected in the annual chemical analyses reconfirmation or is expected
to be present based on changes that occur in the permittee's operations, the permittee shall
immediately notify the Control Authority.
C. TEST METHODS
On September 21, 1998 in conjunction with the promulgation of the Federal Categorical
Pretreatment Standards for the Pharmaceutical Manufacturing Category [40 CFR Part 439], EPA
amended 40 CFR Part 136 [Approved Test Methods for Wastewater Analysis] to include Table
IF-List of Approved Methods for Pharmaceutical Pollutants.
EPA recommends that some of the organic pollutants regulated under 40 CFR Part 439 be
analyzed using EPA Method 1666. However, as of the issuance date of this permit, the State of
North Carolina Division of Water Resources does not certify wastewater laboratories for Method
1666. [The North Carolina Pretreatment Regulations require that all pretreatment compliance
samples be analyzed by a laboratory certified by the State of North Carolina to conduct the
analysis.] Therefore, the permittee is hereby granted permission to use the following test
methods to comply with 40 CFR Part 439.
1. Pharmaceutical Organics Parameter Sampling and Test Procedures:
Sampling by the permittee may consist of one single grab sample for compliance judgment.
Test procedures for the analysis of pollutants shall conform to regulations published by the
United States Environmental Protection Agency (US EPA) pursuant to 40 CFR Part 136 under
which such procedures may be required. The categorical regulated parameters must be analyzed
using appropriate test methods listed in Table IF of 40 CFR 136.3. Alternate methods [i.e.
Method 624 and 625 or 524.2] may be used as long as the method meets the QA/QC
requirements of the applicable Table IF method (see 40 CFR 136.4), and the lab has approval
from NC DWR Laboratory Certification Unit to use the alternative method for the applicable
parameter [copy of approval letter is required]. Detection levels generated by the chosen method
must be low enough to judge compliance with limits contained within Section lI of this permit.
September 1, 2023 Permit Renewal

Page 8, SIU Permit#P005
PROCTER& GAMBLE-SWING RD
Effective September 1, 2023
D. PHARMACEUTICAL ORGANIC PARAMETERS NOT USED OR GENERATED
The permittee has submitted documentation under 40 CFR 439.2 that the following parameters
are neither used nor generated at the facility.
FEDERAL CATEGORICAL STANDARDS
PARAMETER 40 CFR 439.36 and 439.46 LIMITS m /1
Daily Maximum Monthly Average
4-Methyl-2-pentanone 20.7 8.2
(Methyl Isobutyl Ketone)
Isobutyraldehyde 20.7 8.2
n-Amyl acetate 20.7 8.2
n-Butyl Acetate 20.7 8.2
Ethyl acetate 20.7 8.2
Isopropyl acetate 20.7 8.2
Methyl formate 20.7 8.2
Isopropyl ether 20.7 8.2
Tetrahydrofuran 9.2 3.4
Benzene 3.0 0.7
Toluene 0.3 0.2
Xylenes 3.0 0.7
n-Heptane 3.0 0.7
n-Hexane 3.0 0.7
Methylene Chloride 3.0 0.7
Chloroform 0.1 0.03
1,2-Dichloroethane 20.7 8.2
Chlorobenzene 3.0 0.7
o-Dichlorobenzene 20.7 8.2
Diethyl amine 255.0 100.0
Triethyl amine 255.0 100.0
The following statement shall be submitted along with the reconfirmation data to the City of
Greensboro Industrial Waste Section annually:
"The Annual Chemical Reconfirmation Analyses were performed on[insert date]and based
upon my inquiry of the person or persons directly responsible for managing compliance with
Pretreatment Standards for 40 CFR Part 439, I certify that, to the best of my knowledge and
belief, there have been no changes in the processes at our facility that would result in the use
or generation of the parameters listed in this Special Condition since filing of the last
certification. "
The Chemical Reconfirmation Analyses must be conducted once each calendar year. The data
and certification statement must be signed and certified and shall be submitted to the City IWS
by the end of the calendar year. Any parameter detected in the Reconfirmation Analyses can
September 1, 2023 Permit Renewal

Page 9, SIU Permit#P005
PROCTER& GAMBLE— SWING RD
Effective September 1, 2023
result in reopening this SIUpermit to include limits and additional monitoringfor that
parameter.
E. PERMITTEE SAMPLING AND MONITORING REPORT SUBMITTAL DATES
Permittee Sampling for the pollutant limitations in Section III (Effluent Limits and Monitoring
Requirements) of this permit shall be conducted in the following manner:
1. Samples for the January 1-June 30 Reporting Period shall ALL be taken during the
months of January, February and/or March. The compliance report shall be submitted on
or before APRIL 15 of each year.
2. If there are no discharges during months designated for sampling, the April 15
compliance report shall be submitted with the notation"NO DISCHARGE/NO
SAMPLING". If there is a discharge after March and prior to June 30, self-monitoring is
still required to meet the permit monitoring requirements and that data shall be submitted
with the corresponding monthly flow data.
3. Samples for the July 1-December 31 Reporting Period shall ALL be taken during the
months of July, August and/or September. The compliance report shall be submitted on
or before OCTOBER 15 of each year.
4. If there are no discharges during months designated for sampling, the October 15
compliance report shall be submitted with the notation"NO DISCHARGE/NO
SAMPLING". If there is a discharge after September and prior to December 31, self-
monitoring is still required to meet the permit monitoring requirements and that data shall
be submitted with the corresponding monthly flow data.
If there are no discharges during an entire semi-annual reporting period, a letter must be
submitted to the Industrial Waste Section by July 15 or January 15 stating there was no discharge
and no sampling for that period. This letter must be signed and certified by the signatory official.
F. SIGNATORY REQUIREMENTS FOR INDUSTRIAL USER REPORTS
All self-monitoring and re-sampling data submitted for compliance to the City of Greensboro
shall include the certification statement below and shall be signed by the
person on-site at the facility who is authorized to represent the company in an official capacity
concerning matters that involve the City of Greensboro Industrial Waste Section ("Signatory
Official").
1 certify under penalty of law that this document and all attachments were prepared
under my direction or supervision in accordance ivith a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my
inquiry of the person or persons tivho manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate and complete. I am mvare that there are significant
penalties for submitting false information, including the possibility of fine and
imprisonment for knowing violations.
September 1, 2023 Permit Renewal

Page 10, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
G. SLUG/SPILL CONTROL PLAN
The permittee shall provide protection from accidental and slug discharges of prohibited
materials and other substances regulated by this permit, which may have a reasonable potential
to cause Interference or Pass Through, or in any other way violate the POTW's regulations, local
limits or Permit conditions.
The permittee shall notify the Industrial Waste Section immediately of any changes at its facility
affecting the potential for a Slug Discharge.
The permittee shall submit a new or updated slug/spill control plan for approval when so directed
in writing by the City of Greensboro Industrial Waste Section. The plan shall include, but is not
limited to:
■ Description of discharge practices, including non-routine batch discharges;
■ Description of stored chemicals;
■ Procedures for immediately notifying the POTW of slug discharges that would cause a
violation of 40 CFR Part 403.5 (b) [EPA Specific Prohibitions included in Greensboro
SUO Article II, Section 1. B.], with procedures for follow up written notification within 5
days;
■ If necessary, procedures to prevent adverse impact from accidental spills, including
inspection and maintenance of storage areas, handling and transfer of materials, loading
and unloading operations, control of plant site run-off, worker training, building of
containment structures or equipment, measures for containing toxic organic pollutants
(including solvents) and/or measures and equipment for emergency response.
Any current slug/spill control plan developed by the permittee and approved by the City of
Greensboro is hereby incorporated as a condition of this Significant Industrial User Permit.
H. CYANIDE CERTIFICATION
Per 40 CFR Part 439.12(g), compliance with the cyanide limit may be achieved by certifying that
the facility's manufacturing processes neither use nor generate cyanide. The following statement
shall be submitted to the City of Greensboro Industrial Waste Section at least semi-annually:
Based on a review of the raw materials in ztse and an assessment of the process chemistry,
products, and by-products resulting from each of the manufacturing processes conducted
at this facility, I certify that to the best of my knowledge and belief, cyanide is neither used
nor generated at this facility. I hereby certify that I have examined and am familiar with
the information submitted in this document and that the information is true, accurate and
complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
At a minimum, the certification statements are due by July 15"' of each year (covering the
previous January 1 through June 30 period) and by January 151" of each year (covering the
September 1, 2023 Permit Renewal

Page 11, SIU Permit#P005
PROCTER& GAMBLE—SWING RD
Effective September 1, 2023
previous July 1 through December 31 period). Certification statements must not be signed prior
to the end of the semi-annual period.
I. FLOW METER CALIBRATION/VERIFICATION
Flow meters used for flow monitoring under this permit shall be calibrated in accordance with
manufacturer's recommendation by an independent contractor or a Greensboro Industrial Waste
Section approved in-house technician. Calibration documentation shall be maintained for a
minimum of three (3) years and made available upon request and during on-site inspections.
1. Industries with a highly-accurate (<0.5% variance) flow meter, such as a magnetic or
ultrasonic (Doppler and transit) meter, must have the meter calibrated/verified once every
five years.
2. Industries with effluent wastewater meters that are used for City of Greensboro sewer
billing purposes, must calibrate the meters annually. Permanent records in the form of
electronic data trend sheets, strip or circular chart recordings that have back-up and fail-
safe capabilities are also required to be maintained.
3. Any industry may conduct meter calibration more frequently than required in this permit.
The following flovv meters/systems have no calibration requirements:
1. Industries with custom built Memtek©pretreatment systems have a permanently
calibrated flow measurement system (as long as the plumbing remains intact and the
viscosity of the liquid does not change) and no calibration is required.
2. Industries with a non-discharge closed-loop system are not required to have any meter on
the system calibrated.
3. Industries that record daily flow from a City of Greensboro owned, maintained, and
calibrated incoming potable water meter are not required to have the meters calibrated.
4. The Industrial Waste Section does not require deduct meters to be calibrated.
Industries with an electronic data base with power back-up do not need to maintain redundant
paper recorders.
September 1, 2023 Permit Renewal