WQ0020808_Final Permit_20051123

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Q4 Michael F. Easley, Governor
DuayWilliam G. Ross Jr., Secretary
.t^ North Carolina Department of Environment and Natural Resources
0 Alan W. Klimek, RE, Director
Division of Water Quality
November 23, 2005
Ms, Dawn Krueger, Environmental Operations Manager
3M Environmental, Health, and Safety Operations
P.O. Box 33331
St. Paul, Minnesota 55133-3331
Subject: Modified Permit Number WQ0020808
3M Company
Pittsboro, NC Plant
Wastewater Treatment and Reclaimed Water Utilization Facilities
Chatham County
Dear Ms. Krueger;
In accordance with your permit application received April 12, 2005, we are forwarding
herewith Modified Permit No. WQ0020808, dated November 23, 2005, to 3M Company,
Pittsboro, NC Plant for the construction and operation of the subject reclaimed water generation
and utilization system.
This permit shall be effective from the date of issuance until November 22, 2010, and
shall be subject to the conditions and limitations as specified therein. Please pay particular
attention to the monitoring requirements in this permit. Failure to establish an adequate system
for collecting and maintaining the required operational information will result in future
compliance problems. Also, mare note of this permit's expiration date and the fact that a permit
renewal application is due to the Division of Water Quality (Division) no later than six months
prior to that date (i.e., see Condition V1. 8.), as the Division does not send reminders to you to
apply for permit renewal.
If any parts, requirements, or limitations contained in this permit are unacceptable, you
have the right to request an adjudicatory hearing upon written request within thirty (30) days
following receipt of this permit. 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, NC 27699-6714. Unless such
demands are made this permit shall be final and binding.
One (1) set of final approved plans and specifications is to be forwarded to you, one (1)
set is being forwarded to your Engineer (A/E), and one (1) set retained for the Raleigh Regional
Office.
Nne
rthCarolina
Na&rally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Cuslorner Service
Intamet: h2o.enr.state.nc.us 517 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal opportunitylAifirmative Action Employer-- 50% Recycled/10% Post Consumer Paper

Ms. Dawn Krueger, Environmental Operations Manager
November 23, 2005
Page 2
A copy of the approved plans and specifications shall be maintained on file by the owner
for the life of the project.
If you need additional information concerning this matter, please do not hesitate to
contact Cecil G. Madden, Jr., P.E. at [phone].
Sincerely,
Ian W. Klimek, E.
kp:cgm
cc: Chatham County Health Department
Raleigh Regional Office, Aquifer Protection Section
DWQ, Aquifer Protection Program Section, Land Application Unit, Central Files
DWQ, Aquifer Protection Program Section, Land Application Unit, LAU Files
Daniel Blaisdell, P.E.
Cecil G. Madden, Jr., P.E.
Ken Pohlig, P.E.
SRG

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
WASTEWATER TREATMENT and RECLAIMED WATER UTILIZATION PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
3M Company, Pittsboro, NC Plant
Chatham County
Construction and operation of a 300,000 GPD reclaimed water utilization system (reclaimed water
received from the Town of Pittsboro WWTP Reclaimed Water Generation and Distribution
System, permit WQ0024838), consisting of a flowmeter, and 6 -inch and 4 -inch piping internal to
the 3M, Pittsboro, NC Plant, with the reclaimed water directed to two uses internal to the Plant:
evaporative coolers and wetting of fines in the pug mill area, with no discharge of wastes to the
surface waters, pursuant to the application received April 12, 2005, and in conformity with the
project plan, specifications, and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources and considered a part of this permit. All
piping for this reclaimed water utilization system shall be separate from the reclaimed water
utilization system associated with the 5,900 gpd domestic wastewater treatment facility (see
below),
Continued operation of 5,900 -gallon per day wastewater treatment and reclaimed water utilization
facilities to treat and use domestic wastewater generated by 3M Company's Pittsboro, NC Plant
that is located at 4191 North Carolina Highway 87 in Moncure, North Carolina at an approximate
latitude and longitude of 35°39'35" and 79°09'55", respectively. The wastewater treatment and
reclaimed water utilization facilities shall be operated with no discharge of wastes to surface
waters, and shall consist of the following minimum components: one equalization tank,
approximately 10,500 gallons in capacity (i.e., 7,000 -gallon equalization chamber and 3,500-
gallon
,500gallon influent pump chamber), with two 40 -gallon per minute wastewater transfer pumps; a meter
to monitor and record influent wastewater flows continuously; a ZeeWeed°/ZenoGemo
Wastewater Treatment System manufactured by Zenon Environmental, Inc. (Oakville, Ontario
CANADA) consisting of a 3,000 -gallon aerobic reactor chamber, a 3,000 -gallon anoxic chamber

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 2
with pH adjustment system, and a filter chamber with two cassettes of immersible 0.1 -micron
hollow fiber membranes for the bioreaction and subsequent filtration of the influent wastewater as
well as a soak tank for the cleaning of the filter membrane cassettes; a sludge holding tank
approximately 1,000 gallons in capacity; two 91 -cubic foot per minute blowers to provide aeration
to the facilities; two 15 -gallon per minute pumps to convey permeate from the filter chamber to the
backpulse system or the disinfection system; a backpulse system to effect periodic cleaning (i.e.,
backwashing) of the membrane filters and consisting of one 100 -gallon backpulse tank, two 30 -
gallon per minute pumps, and a 15 -gallon hypochlorite tank as well as a 0.5 -gallon per minute
metering pump to chlorinate the backpulse water; a disinfection system consisting of two
ultraviolet disinfection units and two 15 -gallons per minute pumps to recirculate reclaimed water
stored in the storage tank through the disinfectionn system; and a meter to continuously monitor and
record turbidity of the wastewater effluent prior to being conveyed to the storage tank or the
headworks of the facilities for retreatment. The reclaimed water utilization facility (for this
internal domestic wastewater treatment facility) shall consist of the following minimum
components: one storage tank approximately 32,000 gallons of capacity; two six-gallon per minute
pumps to distribute reclaimed water to the pug mill area and/or evaporative coolers for use; and a
meter to monitor and record reclaimed water use flows continuously.
In addition to the above-described components, the combined wastewater treatment and reclaimed
water utilization facilities shall be provided with all-weather access; fencing, signs, tags, labels,
and other means to restrict access to the facilities; audible and visual alarms for each control panel;
a system that continuously (i.e., while the Pittsboro, NC Plant is staffed and/or operational)
monitors and records the status of the facilities' function, alarms, as well as commercial power
availability; power reliability (i.e., standard response procedures, on-site response staff while the
Pittsboro, NC Plant is staffed and/or operational, and a quick -connect receptacle for an on-site
portable power generation unit); and all associated piping, valves, electrical and
instrumentation/control systems, and other appurtenances required to make complete and
functional wastewater treatment and reclaimed water utilization facilities.
This permit shall be effective from the date of issuance until November 22, 2010, and shall be
subject to the following specified conditions and limitations:
I. PERFORMANCE STANDARDS
Upon completion of construction and prior to operation of this permitted facility, a
certification must be received from a professional engineer certifying that the
permitted facility has been installed in accordance with this permit, the approved
plans and specifications, and other supporting materials. If this project is to be
completed in phases and partially certified, you shall retain the responsibility to
track further construction approved under the same permit, and shall provide a final
certificate of completion once the entire project has been completed. Mail the
Certification to the Construction Grants & Loans Section, Division of Water
Quality, 1633 Mail Service Center, Raleigh, NC 27699-1633.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 3
2. The Raleigh Regional Office, telephone No. [phone], shall be notified at
least forty-eight (48) hours in advance of operation of the installed facilities so that
an in-place inspection can be made. Such notification to the regional supervisor
shall be made during normal office hours from 8:00 a.m. until 5:00 p.m. on Monday
through Friday, excluding State Holidays.
3. The 3M Company, Pittsboro, NC Plant is authorized to utilize reclaimed water
from the following facilities:
Reclaimed Water Generating Facility County Permit Maximum Flown
Number ( d)
3M Cam an , Pittsboro, NC Plant Chatham WQ0020808 5,900
Town of Pittsboro WWTP Chatham WQ0024838 300,000
Should reclaimed water quality result in non-compliance with reclaimed water
utilization requirements, then the 3M Company shall take corrective actions to
identity which source of reclaimed water is non-compliant, then either restore
and/or improve the quality of the its generated reclaimed water at its own internal
domestic wastewater treatment facility (Permit WQ0020808), or contact the Town
of Pittsboro to initiate restoration of the reclaimed water generated at the Town of
Pittsboro WWTP (Permit WQ0024838).
4. A temporary variance from 15A NCAC 2H.0219 (k)(1)(A)(viii) has been granted
for these wastewater treatment and reclaimed water utilization facilities in that an
automatically -activated stand-by power generation source shall not be required for
construction and operation at this time. The granting of this temporary variance is
dependent upon the Permittee installing a system that continuously (i.e., while the
Pittsboro, NC Plant is staffed and operational) monitors and records the status of the
facilities' function, alarms, as well as commercial power availability; installing a
quick -connect receptacle; maintaining a portable power generation unit of sufficient
size to operate all essential units at the facilities on site at all times; maintaining on-
site response staff while the Pittsboro, NC Plant is staffed and/or operational; and
developing and implementing standard procedures to respond to a loss in
commercial power. The extension of this temporary variance shall be reevaluated
at the time of permit renewal (i.e., see Condition VI. 8.) for continued applicability
to these facilities. At that time, data regarding the date, time, and duration of any
power interruptions at the facilities as well as the correlation of this data to any
performance or operational problems at these facilities (i.e., including spills and
overflows) shall be provided to the Division for review. This temporary variance
shall be considered to be revoked at any time that the Division notifies the
Permittee that the absence of the automatically -activated stand-by power generation
source at the facilities has been detrimental to water quality or public health.
Within 90 days of this notification, the Permittee shall formally apply for a permit
modification to allow for the construction and operation of an appropriately-

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 4
designed automatically -activated stand-by power source at the facilities. The
automatically -activated stand-by power source shall be installed and made
operational within 30 days of receipt of the modified permit from the Division.
5. A variance from 15A NCAC 2H .0219 (k)(1)(A)(v) has been granted for these
wastewater treatment and reclaimed water utilization facilities in that a five-day
side -stream detention pond/tank shall not be required for construction and operation
at this time. The granting of this temporary variance is dependent upon the
Permittee making provisions to route all wastewater effluent that does not meet the
reclaimed water quality limits (i.e., see Condition II. 6.) to the equalization tank of
the wastewater treatment facilities automatically for retreatment. In addition, the
Permittee shall ensure that the installed monitoring system monitors for such non-
compliant reclaimed water generation events. The extension of this variance shall
be reevaluated at the time of permit renewal (i.e., see Condition VI. 8.) for
continued applicability to these facilities. At that time, data regarding the date,
time, and duration of any non-compliant reclaimed water generation events at the
facilities as well as the correlation of this data to any performance or operational
problems at these facilities (i.e., including spills and overflows) shall be provided to
the Division for review. This variance shall be considered to be revoked at any
time that the Division notifies the Permittee that the absence of the five-day side -
stream detention pond/tank at the facilities has been detrimental to water quality or
public health. Within 90 days of any of this occurrence, Permittee shall formally
apply for a permit modification to allow for the construction and operation of an
appropriately -designed five-day side -stream detention pond/tank at the facilities.
The five-day side -stream detention pond/tank shall be installed and made
operational within 30 days of receipt of the modified permit from the Division.
6. The wastewater treatment and reclaimed water utilization facilities shall be
effectively maintained and operated at all times so that there is no discharge to the
surface waters, nor any contamination of ground waters, which will render them
unsatisfactory for normal use. In the event that the facility fails to perform
satisfactorily, including the creation of nuisance conditions or failure of the
irrigation area to adequately assimilate the wastewater, the Permittee shall take
immediate corrective actions including those actions that may be required by the
Division of Water Quality (Division), such as the construction of additional or
replacement treatment and disposal facilities.
7. The issuance of this permit shall not relieve the Permittee of the responsibility for
damages to surface waters or groundwater resulting from the operation of the
wastewater treatment and reclaimed water utilization facilities.
8. The Permittee shall maintain a spill prevention, countermeasures, and control plan
for the wastewater treatment and reclaimed water facilities.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 5
9. Diversion or bypassing of untreated or treated wastewater/reclaimed water from the
wastewater treatment and/or the reclaimed water utilization facilities shall be
strictly prohibited.
10. The residuals generated from these treatment facilities must be disposed of in
accordance with General Statute 143-215.1 and in a manner approved by the North
Carolina Division of Water Quality.
11. The following buffers shall be, maintained:
a. 50 feet between wastewater treatment units and any property line;
b. 100 feet between wastewater treatment units and any private or public water
supply source (i.e., including wells); and
C. 50 feet between the reclaimed water storage tank and any property line.
12. All reclaimed water valves, storage facilities, outlets shall be tagged or labeled to
warn the public or employees that the water is not intended for drinking_ Where
appropriate, such warning shall inform the public or employees to avoid contact
with the water.
13. All reclaimed water piping, valves, outlets and other appurtenances shall be
color -coded, taped, or otherwise marked to identify the source of the water as being
reclaimed water.
a. All reclaimed water piping and appurtenances shall be either colored purple
(i.e., Pantone 522) and embossed or integrally stamped or marked
"CAUTION: RECLAIMED WATER DO NOT DRINK" or be installed
with a purple (i.e., Pantone 522) identification tape or polyethylene vinyl
wrap. The warning shall be stamped on opposite sides of the pipe and
repeated every three feet or less.
b. Identification tape shall be at least three inches wide and have white or black
lettering on purple (i.e., Pantone 522) field stating "CAUTION:
RECLAIMED WATER DO NOT DRINK." Identification tape shall be
installed on top of reclaimed water pipelines, fastened at least every 10 feet
to each pipe length and run continuously the entire length of the pipe.
C, Existing underground distribution systems retrofitted for the purpose of
distributing reclaimed water shall be taped or otherwise identified as in
items a. or b. above. This identification need not extend the entire length of
the distribution system but shall be incorporated within 10 feet of crossing
any potable water supply line or sanitary sewer line.
14. All reclaimed water valves and outlets shall be of a type, or secured in a manner,
that permits operation by authorized personnel only.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 6
15. Above -ground hose bibs (i.e., spigots or other hand -operated connections) shall not
be present. Hose bibs shall be located in locked below -grade vaults that shall be
clearly labeled as being of non -potable quality. As an alternative to the use of
locked below -grade vaults with standard hose bibs services, hose bibs, which can
only be operated by a special tool may be placed in non -lockable underground
services boxes clearly labeled as non -potable water.
16. The Permittee shall maintain an active cross -connection control program that shall
have the following minimum requirements:
a. No direct cross -connections shall be allowed between the reclaimed water
and potable water systems.
b. A reduced pressure principle backflow preventer, an approved air gap
separation, or other device approved by the Division of Environmental
Health shall be installed at the potable water service connection to the use
area where both reclaimed water and potable water are supplied to a
reclaimed water use area. The installation of the reduced pressure principle
backflow prevention device shall allow proper testing.
C. An air gap separation, approved and regularly inspected by the potable
water supplier, shall be provided between the potable water and reclaimed
water systems where potable water is used to supplement a reclaimed water
system.
17. The following uses of the reclaimed water are approved:
a_ Dust suppression in the pug mill area.
b_ Cooling water in the evaporative coolers.
All other uses for reclaimed water shall not be allowed by the Permittee. In the
event there is a desire for the permitting of additional uses, a formal permit
modification request shall be submitted to the Division accompanied by an
application fee and other supporting materials as may be appropriate. The approval
of this request shall be considered on its merits and may or may not be approved.
18. Public access to the reclaimed water utilization facilities and contact with reclaimed
water shall be controlled during active use. Such controls may include the posting
of signs that describe the activities being conducted at the facilities. Signs shall
state that reclaimed water is utilized and provide subsequent guidance about
avoidance of contact with the reclaimed water, the fact that the reclaimed water is
not intended for drinking, etc.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 7
19. The Permittee shall develop, implement, and maintain an on-going, comprehensive
educational program for its employees and contractors regarding the wastewater
treatment and reclaimed water facilities. Educational programming and materials
may be in the form of formal training sessions, safety meetings, as well as the
distribution of flyers or any combination thereof. The following is a non-inclusive
list of topics that may be included in educational programming and materials:
a. Reclaimed water description and safety;
b. Approved and disapproved uses of reclaimed water;
C. Procedures for spill prevention, control, and notification requirements;
d. Personal safety and hygiene issues;
e. Description of labeling requirements and security measures (i.e., special
hose fittings, locked valve boxes, special pipe color, etc.); and
f. Cross -connection control program description.
II. OPERATION AND MAINTENANCE REQUIREMENTS
The wastewater treatment and reclaimed water utilization facilities shall be properly
maintained and operated at all times.
2. Upon classification of the wastewater treatment and reclaimed water utilization
facilities by the Water Pollution Control System Operators Certification
Commission (WPCSOCC), the Permittee shall designate and employ a certified
operator to be in responsible charge (ORC) and one or more certified operator(s) to
be back-up ORC(s) of the facilities in accordance with 15A NCAC 8G.0201. The
ORC shall visit the facilities in accordance with 15A NCAC 8G .0204 or as
specified in this permit and shall comply with all other conditions specified in these
rules.
3. The Permittee shall install all appropriate flow measurement devices consistent with
approved engineering and scientific practices to ensure accuracy and reliability of
influent flow measurement. Flow measurement devices selected shall be capable of
measuring flows with a maximum deviation: of less than 10 percent from true flow,
accurately calibrated at a minimum of once per year, and maintained to ensure that
the accuracy of the measurement is consistent with the accepted capacity of that
type of device. Records of flow measurement device calibrations shall be kept on
file by the Permittee for a period of at least three years. At a minimum, data to be
included in this documentation shall be:
a. Date of flow measurement device calibration.
b. Name of person performing calibration.
C. Percent from true flow.
4. The facilities shall be effectively maintained and operated as a non -discharge
system to prevent the discharge of any wastewater, treated or untreated, resulting
from the operation of these facility.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 8
5. As an indicator of proper operation and maintenance, the domestic 5,900 gpd
wastewater treatment facility shall produce a wastewater effluent/reclaimed water
in compliance with the following limitations:
Parameter Monthly Average a
vera e$ Dail Instantaneous Maximum"
Flow 0.0059 MGD
Ammonia as Nitrogen 4 mg/L 6 mg/L
BODS (5 -day, 20°C) 10 mg/L 15 mg/L
Fecal Coliform 14 per 100 mL 25 per 100 mL
Total Suspended Solids 5 mg/L 10 mg/L
Turbidity 10 NTU
pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
u Monthly averages for all parameters except fecal coliform shall be the arithmetic
mean of all samples collected during the reporting period. The monthly average
for fecal coliform shall be the geometric mean of all samples collected during the
reporting period.
The daily maximum shall be the maximum value of all samples collected during
the reporting period.
6. All wastewater shall be routed to the equalization tank of the wastewater treatment
facilities for retreatment should the limit for fecal coliform or turbidity, as
established in Condition 11. 5., be exceeded following treatment in the wastewater
treatment facilities. Wastewater shall be diverted to this tank until such time that
the problems associated with the treatment capability of the wastewater treatment
facilities have been corrected and the limits are no longer exceeded.
7. No type of reclaimed water other than that from 3M Company's Pittsboro, NC Plant
and the Town of Pittsboro's wastewater treatment plant shall be used in the
reclaimed water utilization facility.
III. MONITORING AND REPORTING _REQUIREMENTS
1. Any monitoring (including groundwater, surface water, soil or plant tissue analyses)
deemed necessary by the Division to insure surface and ground water protection will
be established and an acceptable sampling reporting schedule shall be followed.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 9
2. The reclaimed water generated by the 3M Company, Pittsboro, NC Plant domestic
5,900 gpd wastewater treatment facility shall be monitored by the Permittee at the
specified sampling points for the following parameters, and recorded on Form
NDMR- l :
3. A log of all maintenance activities performed at the wastewater treatment and
reclaimed water utilization facilities shall be kept. This log shall include, but shall
not be limited to, the following items:
a. Daily sampling results including pH, settleable matter, and dissolved oxygen
in the aeration tank.
b. Visual observations of the wastewater treatment and reclaimed water
utilization facilities.
C, Record of all preventative maintenance (e.g., changing of filters, adjusting
belt tensions, alarm testing, diffuser inspections and cleanings, membrane
cleaning, etc.).
d. Date of calibration of the flow measurement device(s).
e. Date of calibration of the turbidity device.
f. Date and volume of residuals removed from the wastewater treatment
facilities, including the name of the hauling firm as well as a permit
authorizing the disposal or a letter from the entity agreeing to accept the
residuals.
4. Adequate records shall be maintained by the Permittee to track the amount of
reclaimed water used in the reclaimed water utilization facilities. These records shall
include, but shall not necessarily be limited to, the following items:
a. Date of use;
b. Volume of reclaimed water used;
C. Location of reclaimed water use; and
d. Compliance status of the wastewater treatment facilities.
Sampling
Sampling
Type of
Parameter
Point
Frequency
Sample
Flow
See Below
See Below
See Below
..................
WWTF Influent
Continuous
Recording
..................
Storage Tank Effluent Continuous
Recording
Turbidity
WWTF Effluent
Continuous
Recording
pH
WWTF Effluent
Daily
Grab
Settleable Matter
WWTF Effluent
Daily
Grab
Ammonia as Nitrogen
WWTF Effluent
Twice per Month
Grab
BOD (5 -day, 20°C)
WWTF Effluent
Twice per Month
Grab
Total Suspended Solids
WWTF Effluent
Twice per Month
Grab
Fecal Coliform
WWTF Effluent
Twice per Month
Grab
3. A log of all maintenance activities performed at the wastewater treatment and
reclaimed water utilization facilities shall be kept. This log shall include, but shall
not be limited to, the following items:
a. Daily sampling results including pH, settleable matter, and dissolved oxygen
in the aeration tank.
b. Visual observations of the wastewater treatment and reclaimed water
utilization facilities.
C, Record of all preventative maintenance (e.g., changing of filters, adjusting
belt tensions, alarm testing, diffuser inspections and cleanings, membrane
cleaning, etc.).
d. Date of calibration of the flow measurement device(s).
e. Date of calibration of the turbidity device.
f. Date and volume of residuals removed from the wastewater treatment
facilities, including the name of the hauling firm as well as a permit
authorizing the disposal or a letter from the entity agreeing to accept the
residuals.
4. Adequate records shall be maintained by the Permittee to track the amount of
reclaimed water used in the reclaimed water utilization facilities. These records shall
include, but shall not necessarily be limited to, the following items:
a. Date of use;
b. Volume of reclaimed water used;
C. Location of reclaimed water use; and
d. Compliance status of the wastewater treatment facilities.

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 10
Three (3) copies of all monitoring data (as specified in condition. III. 2.) on Form.
NDMR-1 shall be submitted monthly on or before the last day of the following
month. All information shall be submitted to the following address:
NC DENR/DWQ
Information Processing Center
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
6. Noncompliance Notification:
The Permittee shall report by telephone to the Raleigh Regional Office, telephone
number [phone], as soon as possible, but in no case more than 24 hours or
on the next working day following the occurrence or first knowledge of the
occurrence of any of the following:
a. Any occurrence at the wastewater treatment facility which results in the
treatment of significant amounts of wastes which are abnormal in quantity
or characteristic, such as the dumping of the contents of a sludge digester;
the known passage of a slug of hazardous substance through the facility; or
any other unusual circumstances.
b. Any process unit failure, due to known or unknown reasons, that render the
facility incapable of adequate wastewater treatment such as mechanical or
electrical failures of pumps, aerators, compressors, etc.
Any failure of a pumping station, sewer line, or treatment facility resulting
in a by-pass directly to receiving waters without treatment of all or any
portion of the influent to such station or facility.
d. Any time that self-monitoring information indicates that the facility has
gone out of compliance with its permit limitations.
Occurrences outside normal business hours may also be reported to the Division's
Emergency Response personnel at telephone number [phone], (800) 858-
0368, or [phone]. Persons reporting such occurrences by telephone shall
also file a written report in letter form within five (5) days following first
knowledge of the occurrence. This report must outline the actions taken or
proposed to be taken to ensure that the problem does not recur.
IV. GROUNDWATER REQUIREMENTS
1. The compliance boundary and review boundary for wastewater disposal systems are
specified by 15A NCAC 2L. For systems utilizing reclaimed water, 15A NCAC 2H
.0219(k) specifies that both the compliance boundary and review boundary shall be

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 11
established at the property line. An exceedance of groundwater quality standards at
or beyond the compliance boundary is subject to immediate remediation action in
addition to the penalty provisions under North Carolina General Statute
143-215.6A(a)(1).
2. Any groundwater quality monitoring, as deemed necessary by the Division, shall be
provided.
V. INSPECTIONS
1. Adequate inspection, maintenance, and cleaning shall be provided by the Permittee
to insure proper operation of the subject facilities.
2. The Permittee or his designee shall inspect the wastewater treatment and reclaimed
water utilization facilities to prevent malfunctions and deterioration, operator errors
and discharges which may cause or lead to the release of wastes to the environment,
a threat to human health, or a nuisance. The Permittee shall keep an inspection log
or summary including at least the date and time of inspection, observations made,
and any maintenance, repairs, or corrective actions taken by the Permittee. This log
of inspections shall be maintained by the Permittee for a period of three years from
the date of the inspection and shall be made available upon request to the Division
or other permitting authority.
3. Any duly authorized officer, employee, or representative of the Division may, upon
presentation of credentials, enter and inspect any property, premises or place on or
related to the disposal site or facility at any reasonable time for the purpose of
determining compliance with this permit; may inspect or copy any records that must
be maintained under the terms and conditions of this permit, and may obtain
samples of groundwater, surface water, or leachate.
VI. GENERAL CONDITIONS
This permit shall become voidable unless the facilities are constructed in
accordance with the conditions of this permit, the approved plans and
specifications, and other supporting data.
2. This permit is effective only with respect to the nature and volume of wastes
described in the application and other supporting data.
A set of approved plans and specifications as well as the approved as -built plans for
the wastewater treatment and reclaimed water utilization facilities shall be retained
by the Pennittee for the life of the project.
4. This permit is not transferable. In the event there is a desire for the facilities to
change ownership, or there is a name change of the Permittee, a formal permit

3M Company, Pittsboro, NC Plant
Permit WQ0020808
November 23, 2005
Page 12
request must be submitted to the Division accompanied by an application fee,
documentation from the parties involved, and other supporting materials as may be
appropriate. The approval of this request will be considered on its merits and may
or may not be approved.
5. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to an enforcement action by the Division in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
6. The issuance of this permit does not exempt the Permittee from complying with any
and all statutes, rules, regulations, or ordinances which may be imposed by other
government agencies (local, state, and federal) which have jurisdiction, including
but not limited to applicable river buffer rules in 15A NCAC 2B .0200, erosion and
sedimentation control requirements in 15A NCAC Chapter 4 and under the
Division's General Permit NCGO10000, and any requirements pertaining to
wetlands under 15A NCAC 2B .0200 and 2H .0500.
7. The annual administration and compliance fee must be paid by the Permittee within
thirty (30) days after being billed by the Division. Failure to pay the fee
accordingly may cause the Division to initiate action to revoke this permit as
specified by 15A NCAC 21-1.0205 (c)(4).
The Permittee, at least six (6) months prior to the expiration of this permit, shall
request its extension. Upon receipt of the request, the Division will review the
adequacy of the facilities described therein, and if warranted, will extend the permit
for such period of time and under such conditions and limitations as it may deem
appropriate_
9. This reclaimed water utilization permit shall become voidable unless the agreement
between the 3M Company and the Town. of Pittsboro for the provision of reclaimed
water is in full force and effect.
Permit issued this the 23`a day of November 2005.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISS[ON
?nW. limek, PE.Dir ctor£ Water Qualitity of the Environmental Management Commission
No. WQ0020808

3M Company, Pittsboro, NC Plant
Wastewater Treatment and Reclaimed Water Utilization Facilities
Permit WQ0020808
Issued November 23, 2005
Engineer's Certification
1, , as a duly registered Professional Engineer in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the 3M Company, Pittsboro, NC Plant, located in Chatham County, hereby
state that to the best of my abilities, due care and diligence was used in the observation of the
following construction:
Construction and operation of a 300,000 GPD reclaimed water utilization system
(reclaimed water received from the Town of Pittsboro W WTP Reclaimed Water
Generation and Distribution System, permit WQ0024838), consisting of a flowmeter, and
6 -inch and 4 -inch piping internal to the 3M, Pittsboro, NC Plant, with the reclaimed
water directed to two uses internal to the Plant: evaporative coolers and wetting of lines
in the pug mill area, with no discharge of wastes to the surface waters, and in conformity
with the project plan, specifications, and other supporting data subsequently filed and
approved by the Department of Environment and Natural Resources.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Signature: Registration No.
Date:
Mail this Certification to the: DENR/DWQ
Construction Grants & Loans Section
Attn: Ken Pohlig, P.E.
1633 Mail Service Center
Raleigh, NC 27699-1633

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US GEOLOGICAL SURVEY
3M Pittsboro Project FIGURE 1
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I tweby rvdify that this plan, spe ftantion
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