AQ_F_0400045_20180417_PRMT_Permit

{
ROY COOPER
Governor
1 f�.
MICHAEL S.REGAN
a Secretary
Air Quality 1�f l�TT t L A A 77A7 VAC+
ENVIRONMENTAL QUALITY MICHAEL A.ABRACZINSKAS
Director
April 17, 2018
Mr. Karl Hildreth
Owner
Hildreth Ready Mix, LLC
PO Box 1098
Wadesboro,NC 28170
Subject: Air Permit No. 08715G04
GENERAL AIR PERMIT FOR CONCRETE BATCH PLANTS
Hildreth Ready Mix, LLC
Wadesboro, Anson County,North Carolina
Permit Class: General Small
Facility ID#0400045
Dear Mr. Hildreth:
In accordance with your completed application received April 5, 2018,we are forwarding
herewith Permit No. 08715G04 to Hildreth Ready Mix, LLC, Wadesboro, Anson County,North
Carolina for the construction and operation of air emissions sources or air cleaning devices and
appurtenances. Additionally, any emissions activities determined from your air permit application
as meeting the exemption requirements contained in 15A NCAC 2Q .0102 have been listed for
information purposes as an "ATTACHMENT" to the enclosed air permit. Please note the records
retention requirements are contained in General Condition 2 of the General Conditions and
Limitations.
If any parts,requirements, or limitations contained in this permit are unacceptable to you,
you have the right to request a formal adjudicatory hearing within 30 days following receipt of this
permit, identifying the specific issues to be contested. Such a request will stay the effectiveness of
the entire permit. This hearing request must be in the form of a written petition, conforming to G.S.
150B-23 of the North Carolina General Statutes, and filed with the Office of Administrative
Hearings, 6714 Mail Service Center, Raleigh,NC 21699-6714. The form for requesting a formal
adjudicatory hearing may be obtained upon request from the Office of Administrative Hearings.
Unless a request for a hearing is made pursuant to G.S. 150B-23,this air permit shall be final and
binding.
You may request modification of your air permit through informal means pursuant to G.S.
150B-22. This request must be submitted in writing to the Director and must identify the specific
provisions or issues for which the modification is sought. Please note that the permit will become
final and binding regardless of a request for informal modification unless a request for a hearing is
also made under G.S. 150B-23.
State of North Carolina I Environmental Quality I Air Quality
Fayetteville Regional Office 1 275 Green Street,Suite 714 1 Fayetteville,NC 28301-5094
910 433 3300 T 1 910 485 7467 F

i
Karl Hildreth
April 17, 2018
Page 2
Unless exempted by a condition of this permit or the regulations, construction of new
air pollution sources or air cleaning devices, or modifications to the sources or air cleaning
devices described in this permit must be covered under a permit issued by the Division of Air
Quality prior to construction. Failure to do so is a violation of G.S. 143-215.108 and may
subject the Permittee to civil or criminal penalties as described in G.S. 143-215114A and 143-
215.114B.
This permit shall be effective from April 17,2018 until March 31,2026, is nontransferable
to future owners and operators, and shall be subject to the conditions and limitations as specified
therein.
Changes have been made to the permit stipulations. The Permittee is responsible for
carefully reading the entire permit and evaluating the requirements of each permit
stipulation. The Permittee shall comply with all terms, conditions, requirements, limitations
and restrictions set forth in this permit. Noncompliance with any permit condition is grounds
for enforcement action, for permit termination, revocation and reissuance, or modification, or
for denial of a permit renewal application. Should you have any questions concerning this matter,
please contact Gregory Reeves at 910-433-3300.
Sincerely,
Heather Carter, Regional Supervisor
Division of Air Quality,NC DEQ
GWR
Enclosures
c: Fayetteville Regional Office

:F
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF AIR QUALITY
AIR PERMIT NO. 08715G04
Issue Date: April 17, 2018 Effective Date: April 17, 2018
Expiration Date: March 31, 2026 Replaces Permit: 08715G03
To construct and operate air emission source(s) an cleaning d is and for th p e s and/or air eanin ev e s , o e
O g O
discharge of the associated air contaminants into the atmosphere in accordance with the provisions
of Article 21.B of Chapter 143, General Statutes of North Carolina(NCGS) as amended, and other
applicable Laws, Rules and Regulations,
Hildreth Ready Mix,LLC
878 City Pond Road- SR 1142 .
Wadesboro, Anson County,North Carolina
Permit Class: General Small
Facility ID#0400045
(the Permittee) is hereby authorized to construct and operate the air emissions sources and/or air
cleaning devices and appurtenances described below:
One Concrete batch plant with fabric filter air pollution control system(s) installed on all sources;
1. One (1) cement mixing weigh hopper and loading operation; and,
2. Silos for cement and flyash storage.
in accordance with the completed application 0400045.18A received April 5,2018 including any
plans, specifications,previous applications, and other supporting data, all of which are filed with the
Department of Environmental Quality, Division of Air Quality(DAQ) and are incorporated as part
of this permit.
This permit is subject to the following specified conditions and limitations including any
TESTING,REPORTING, OR MONITORING REQUIREMENTS:

Permit No. 08715G04
Page 2
A. SPECIFIC CONDITIONS AND LIMITATIONS
1. Any air emission sources or control devices authorized to construct and operate above must
be operated and maintained in accordance with the provisions contained herein. The
Permittee shall comply with applicable Environmental Management Commission
Regulations, including Title 15A North Carolina Administrative Code (NCAC), Subchapter
2D .0202, 2D .0515, 2D .0521, 2D .0535, 2D .0540, 2D .0611, 2D .1100, 2Q .0310 and 2Q
.0711.
2. PERMIT RENEWAL AND EMISSION INVENTORY REQUIREMENT -The Permittee,
at least 90 days prior to the expiration date of this permit, shall request permit renewal by
!, letter in accordance with 15A NCAC 2Q .0304(d) and(f). Pursuant to 15A NCAC 2Q
.0203(i), no permit application fee is required for renewal of an existing air permit (without
a modification request). The renewal request(with AA application form) should be
submitted to the Regional Supervisor, DAQ. Also, at least 90 days prior to the expiration
date of this permit,the Permittee shall submit the air pollution emission inventory report
(with Certification Sheet) in accordance with 15A NCAC 2D .0202, pursuant to N.C.
General Statute 143 215.65. The report shall be submitted to the Regional Supervisor, DAQ
and shall document air pollutants emitted for the 2024 calendar year.
3. PARTICULATE CONTROL REQUIREMENT - As required by 15A NCAC 21) .0515
"Particulates from Miscellaneous Industrial Processes," particulate matter emissions from
the emission sources shall not exceed allowable emission rates. The allowable emission rates
are, as defined in 15A NCAC 21) .0515, a function of the process weight rate and shall be
determined by the following equation(s), where P is the process throughput rate in tons per
hour(tons/hr) and E is the allowable emission rate in pounds per hour(lbslhr).
E =4.10 * (P) 0.67 for P <= 30 tons/hr, or
E=55 * (P) 0-"- 40 for P >30 tons/hr

i
Permit No. 08715G04
Page 3
4. VISIBLE EMISSIONS CONTROL REQUIREMENTS -As required by 15A NCAC 2D
.0521 "Control of Visible Emissions," visible emissions from the permitted sources shall
meet the visible emissions control requirements listed below:
a. Visible emissions from sources manufactured after July 1 1971 shall not be more
than 20 percent opacity when averaged over a six-minute period, except that six-
minute periods averaging not more than 87 percent opacity may occur not more than
once in any hour nor more than four times in any 24-hour period.
b. Visible emissions from sources manufactured as of July 1, 1971 shall not be more
than 40 percent opacity when averaged over a six-minute period, except that six-
minute periods averaging not more than 90 percent opacity may occur not more than
once in any hour nor more than four times in any 24-hour period.
However, sources which must comply with 15A NCAC 21) .0524 "New Source
Performance Standards" or .I 111 "National Emission Standards for Hazardous Air
Pollutants" must comply with applicable visible emissions requirements contained therein
instead of the standard listed above.
5. NOTIFICATION REQUIREMENT - As required by 15A NCAC 2D .0535, the Permittee of
a source of excess emissions that last for more than four hours and that results from a
malfunction, a breakdown of process or control equipment or any other abnormal
conditions, shall:
a. Notify the Director or his designee of any such occurrence by 9:00 a.m. Eastern time
of the Division's next business day of becoming aware of the occurrence and
describe:
i. the name and location of the facility,
ii. the nature and cause of the malfunction or breakdown,
iii. the time when the malfunction or breakdown is first observed,
iv, the expected duration, and
V. an estimated rate of emissions.
b. Notify the Director or his designee immediately when the corrective measures have
been accomplished.
This reporting requirement does not allow the operation of the facility in excess of
Environmental Management Commission Regulations.

it
Permit No. 08715G04
Page 4
i
1
j 6. FUGITIVE DUST CONTROL REQUIREMENT -As required by 15A NCAC 2D .0540
"Particulates from Fugitive Dust Emission Sources," the Permittee shall not cause or allow
fugitive dust emissions to cause or contribute to substantive complaints or excess visible
emissions beyond the property boundary. If substantive complaints are received or excessive
fugitive dust emissions from the facility are observed beyond the property boundaries for six
minutes in any one hour (using Reference Method 22 in 40 CFR, Appendix A),the owner or
operator may be required to submit a fugitive dust plan as described in 2D .0540(f).
"Fugitive dust emissions" means particulate matter that does not pass through a process
stack or vent and that is generated within plant property boundaries from activities such as:
unloading and loading areas, process areas stockpiles, stock pile working, plant parking lots,
and plant roads (including access roads and haul roads).
7. FABRIC FILTER REQUIREMENT -Particulate matter emissions from the permitted
filters. Pursuant to 15A NCAC 2D .0611
equipment shall be controlledb f bric y a ,the
Permittee shall inspect and maintain the fabric filters as provided below:
a. Inspection and Maintenance Requirements - To comply with the provisions of-this
permit and ensure that emissions do not exceed the regulatory limits, the Permittee
shall perform, at a minimum, an annual (for each 12 month period following the
initial inspection) internal inspection of the fabric filter system. In addition, the
Permittee shall perform periodic inspections and maintenance as recommended by
the equipment manufacturer.
b. Recordkeeping Requirements - The results of all inspections and any variance from
manufacturer's recommendations or from those given in this permit(when
applicable), shall be investigated with corrections made and dates of actions recorded
in a logbook. Records of all maintenance activities shall be recorded in the logbook.
The logbook(in written or electronic form) shall be kept on-site and made available
to DAQ personnel upon request.

Permit No. 08715G04
Page 5
8. TOXIC AIR POLLUTANT CONTROL REQUIREMENTS - The facility shall not emit
arsenic in such quantities that may cause an exceedance of the acceptable ambient level
(AAL)pursuant to 15A NCAC 2D .1104. To demonstrate compliance with this requirement,
the Permittee shall limit the quantity of concrete processed to less than the applicable
"Maximum Concrete Production Rate", as listed below, based on the type of facility(truck
mix or central mix) and the facility's "Minimum Distance to Property Line." "Minimum
distance to property line" is the distance from the cement mixing weigh hopper to the closest
point of the facility's property line.
For Truck Mix Facilities:
Minimum Distance to Property Line Maximum Concrete Production Rate
meters/feet yd'/year
10 m 132.8 ft 233,500
15 m 149.2 ft 284,500
20 m/65.6 ft 340,500
25 m 182.0 ft 392,500
30 m/98.4 ft 438,500
35 m/ 114.8 ft 508,500
40 m/ 131.2 ft 615,500
45 m/ 147.6 ft 680,500
50 m/ 164.0 ft 742,500
55 m/ 180.4 ft 815,500
60 m/ 196.8 ft 896,000
For Central Mix Facilities:
Minimum Distance to Property Line Maximum Concrete Production Rate
meters/feet A'/year
10 m/32.8 ft 327,000
15 m/49.2 ft 417,000
20 m/65.6 ft 581,000
25 m/ 82.0 ft 766,500
30 m/98.4 ft 1,002,500
35 m/ 114.8 ft 1,358,000
40 m/ 131.2 ft 1,358,000
45 m/ 147.6 ft 1,358,000
50 m/ 164.0 ft 1,358,000
55 m/ 180.4 ft 1,358,000
60 m/ 196.8 ft 1,358,000

iI
Permit No. 08715G04
Page 6
1
The"Maximum Concrete Production Rate"may not be interpolated for property line distances
falling between two values listed above.(For example,a Truck Mix facility with a"Minimum
Distance to Property Line" of less than 60 meters but greater than or equal to 55 meters would be
subject to a"Maximum Concrete Production Rate" of 815,500 yd3lyr.)
a. Property Line Identification- The Permittee shall maintain a physical marker at the
point on the property line used to establish the "Minimum Distance to Property
Line", as defined above. The physical marker may consist of any fixture, including
(but not limited to) a property line fence or a pole or stake installed at the point for
the specific purpose of meeting this requirement.
b. Monitoring/Recordkeeping Requirements - The Permittee shall maintain the
following records in a logbook. The logbook (in written or electronic form) shall be
kept on-Site and made available to DAQ personnel upon request.
i. Each calendar month,the Permittee shall record the quantity of concrete
processed during the previous calendar month(in yd3/month); and,
ii. Each calendar year,the Permittee shall record the quantity of concrete
processed between January 1' and December 31" of the previous calendar
year(in yd3/year).
c. Notification Re uirement- The Permittee shall submit a notification to the Regional
Supervisor within 15 days of installing an additional cement silo and/or flyash silo.
The notification shall include the following:
is A description of the proposed silo, including storage capacity and material
- stored;
ii. A description of the proposed emission control; and,
iii. A statement indicating that the facility shall continue to qualify for the
general permit, as described in Specific Condition No. 9 of this permit.
9. In accordance with 15A NCAC 2Q .0310, the facility shall qualify for this general permit
provided it meets EACH of the following criteria:
a. The facility does not operate any emission sources other than emission sources listed
on Page 1 of this permit.
b. The facility is not subject to any 15A NCAC 2D or 2Q regulation not addressed in
Specific Condition No. 1.

Permit No. 08715G04
Page 7
c. The facility is located in one of the following counties:
j Alamance Cumberland Harnett North Hampton Scotland
Anson Currituck Hertford. Onslow Stanly
Beaufort Dare Hoke Orange Stokes
Bladen Davidson Hyde Pamlico Surry
Brunswick Davie Iredell Pasquotank Tyrrell
Cabarrus Duplin Johnston Pender Union
Camden Durham Jones Perquimans Vance
Carteret Edgecombe Lee Person Wake
Caswell Franklin Lenoir Pitt Warren
Catawba Gaston Lincoln Randolph Washington
Chatham Gates Martin Richmond Wayne
Chowan Granville Montgomery Robeson Wilson
Cleveland Greene Moore Rockingham Yadkin
Columbus Guilford Nash Rowan
Craven Halifax New Hanover Sampson
d. The facility is a truck mix or a central mix concrete batch plant that does not
process more concrete during any calendar year than the maximum production rate,
as listed below, applicable to the facility based on its "minimum distance to property
line". "Minimum distance to property line" is the distance from the cement mixing
weigh hopper to closestpoint of the facility's property line.
' For Truck Mix Facilities:
Minimum Distance to PropeLty Line Maximum Concrete Production Rate
meters/feet year
10 m/ 32.8 ft 233,500
15 m/49.2 ft 284,500
20 m/ 65.6 ft 340,500
25 ni/ 82.0 ft 392,500
30 m/ 98.4 ft 438,500
35 m/ 114.8 ft 508,500
40 m/ 131.2 ft 615,500
45 m/ 147.6 ft 680,500
50 m/ 164.0 ft 742,500
55 ru/ 180.4 ft 815,500
60 m/ 196.8 ft 896,000

:j
a
Permit No. 08715G04
Page 8
For Central Mix Facilities:
Minimum_Distance to Property Line Maximum Concrete Production Rate
meters/feet yd'/year
10 m/32.8 ft 327,000
15 m/49.2 ft 417,000
20 m/65.6 ft 581,000
25 m/ 82.0 ft 766,500
30 m/98.4 ft 1,002,500
35 m/ 114.8 ft 1,358,000
40 m/ 131.2 ft 1,358,000
45 m/ 147.6 ft 1,358,000
50 m/ 164.0 ft 1,358,000
55 m/ 180.4 ft 1,358,000
60 m/ 196.8 ft 1,358,000
The "Maximum Concrete Production Rate"may not be interpolated for property line distances falling
between two values listed above.(For example,a Truck Mix facility with a"Minimum Distance to Property
Line"of less than 60 meters but greater than or equal to 55 meters would be subject to a"Maximum Concrete
Production Rate" of 815,500 yd3lyr.)
10. TOXIC AIR POLLUTANT EMISSION LIMITATIONS - Pursuant to 15A NCAC 2Q .0711
"Emission Rates Requiring a Permit," for each of the toxic air pollutants (TAPs) listed
below, facility-wide actual emissions may not exceed the Toxic Permit Emission Rates
(TPERs) listed in 15A NCAC 2Q .0711(a):
Beryllium 0.218
Cadmium 0.37
Chromium* 0.013
Manganese and compounds 0.63
Nickel metal 0.13
*"Chromium" includes all soluble chromate compounds,as chromium(VI)equivalent.
The Permittee shall be responsible for obtaining a permit to emit TAPs and for
demonstrating compliance with the requirements of 15A NCAC 2D .1100 "Control of Toxic
Air Pollutants" PRIOR to exceeding any of the listed TPERs.

Permit No. 08715G04
`i Page 9
A
B. GENERAL CONDITIONS AND LIMITATIONS
1. In accordance with G.S. 143-215.108(c)(1), TWO COPIES OF ALL DOCUMENTS
REPORTS, TEST DATA, MONITORING DATA,NOTIFICATIONS, REQUESTS FOR
RENEWAL AND ANY OTHER INFORMATION REQUIRED BY THIS PERMIT shall
be submitted to the:
Regional Supervisor
North Carolina Division of Air Quality
Fayetteville Regional Office
Systel Building
225 Green Street, Suite 714
Fayetteville,NC 28301-5094
910-433-3300
For identification purposes, each submittal should include the facility name as listed on the
permit,the facility identification number, and the permit number.
2. RECORDS RETENTION REQUIREMENT - In accordance with 15A NCAC 2D .0605,
any records required by the conditions of this permit shall be kept on site and made available
to DAQ personnel for inspection upon request. These records shall be maintained in a form
suitable and readily available for expeditious inspection and review. These records must be
kept on site for a minimum of 2 years, unless another time period is otherwise specified.
3. ANNUAL FEE PAYMENT - Pursuant to 15A NCAC 2Q .0203(a),the Permittee shall pay
the annual permit fee within 30 days of being billed by the DAQ. Failure to pay the fee in a
timely manner will cause the DAQ to initiate action to revoke the permit.
4. EQUIPMENT RELOCATION - In accordance with 15A NCAC 2Q .0301, a new air permit
shall be obtained by the Permittee prior to establishing, building, erecting, using, or
operating the emission sources or air cleaning equipment at a site or location not specified in
this permit.
5. REPORTING REQUIREMENT - In accordance with 15A NCAC 2Q .0309, any of the
following that would result in previously unpermitted, new, or increased emissions must be
reported to the Regional Supervisor, DAQ:
i
i
a. changes in the information submitted in the application regarding facility emissions;
b. changes that modify equipment or processes of existing permitted facilities; or
c. changes in the quantity or quality of materials processed.
If appropriate,modifications to the permit may then be made by the DAQ to reflect any
necessary changes in the permit conditions. In no case are any new or increased emissions
allowed that will cause a violation of the emission limitations specified herein.

Permit No. 08715G04
Page 10
6. In accordance with 15A NCAC 2Q .0309,this permit is subject to revocation or
modification by the DAQ upon a determination that information contained in the application
or presented in the support thereof is incorrect, conditions under which this permit was
anted have changed, or violations of conditions contained in this permit have occurred. In
�' g a
accordance with G.S. 143-215.108(c)(1),the facility shall be properly operated and
maintained at all times in a manner that will effect an overall reduction in air pollution.
Unless otherwise specified by this permit, no emission source may be operated without the
concurrent operation of its associated air cleaning device(s) and appurtenances.
7. In accordance with G.S. 143-215.108(c)(1),this permit is nontransferable by the Permittee.
Future owners and operators must obtain a new air permit from the DAQ.
8. In accordance with G.S. 143-215.108(c)(1), this issuance of this permit in no way absolves
the Permittee of liability for any potential civil penalties which may be assessed for
violations of State law which have occurred prior to the effective date of this permit.
9. In accordance with G.S. 143-215.108(c)(1), this permit does not relieve the Permittee of the
responsibility of complying with all applicable requirements of any Federal, State, or Local
water quality or land quality control authority.
10. In accordance with 15A NCAC 2D .0605, reports on the operation and maintenance of the
facility shall be submitted by the Permittee to the Regional Supervisor, DAQ at such
intervals and in such form and detail as may be required by the DAQ. Information required
in such reports may include, but is not limited to,process weight rates, firing rates;hours of
operation, and preventive maintenance schedules.
11. A violation of any term or condition of this permit shall subject the Permittee to enforcement
pursuant to G.S. 143-215.114A, 143-215.114B, and 143-215.114C, including assessment of -
civil and/or criminal penalties.
12. Pursuant to North Carolina General. Statute 143-215.3(a)(2), no person shall refuse entry or
access to any authorized representative of the DAQ who requests entry or access for
purposes of inspection, and who presents appropriate credentials, nor shall any person
obstruct, hamper, or interfere with any such representative while in the process of carrying
out his official duties. Refusal of entry or access may constitute grounds for permit
revocation and assessment of civil penalties.
13. In accordance with G.S. 143-215.108(c)(1), this permit does not relieve the Permittee of the
responsibility of complying with any applicable Federal, State, or Local requirements
governing the handling, disposal, or incineration of hazardous, solid, or medical wastes,
including the Resource Conservation and Recovery Act(RCRA) administered by the
Division of Waste Management.
14. PERMIT RETENTION REQUIREMENT - In accordance with 15A NCAC 2Q .0110,the
Permittee shall retain a current copy of the air permit at the site. The Permittee must make
available to personnel of the DAQ, upon request, the current copy of the air permit for the
site.

Permit No. 08715G04
Page 11
15. CLEAN AIR ACT SECTION 112(r} REQUIREMENTS - Pursuant to 15A NCAC 2D .2100
"Risk Management Program," if the Permittee is required to develop and register a risk
management plan pursuant to Section 112(r) of the Federal Clean Air Act, then the
Permittee is required to register this plan with the USEPA in accordance with 40 CFR Part
68.
16. PREVENTION OF ACCIDENTAL RELEASES - GENERAL DUTY- Pursuant to Title I
Part A Section 112(r)(1) of the Clean Air Act "Hazardous Air Pollutants - Prevention of
Accidental Releases -Purpose and General Duty," although a risk management plan may not
be required, if the Permittee produces, processes, handles, or stores any amount of a listed
hazardous substance, the Permittee has a general duty to tape such steps as are necessary to
prevent the accidental release of such substance and to minimize the consequences of any
release. This condition is federally-enforceable only.
17. GENERAL EMISSIONS TESTING AND REPORTING REQUIREMENTS - If emissions
testing is required by this permit, or the DAQ, or if the Permittee submits emissions testing
to the DAQ in support of a permit application or to demonstrate compliance,the Permittee
shall perform such testing in accordance with 15A NCAC 2D .2600 and follow all DAQ
procedures including protocol approval,regional notification, report submittal, and test
results approval. Additionally, in accordance with 15A NCAC 2D .0605,the permittee shall
follow the procedures for obtaining any required audit sample and reporting those results..
Permit issued this the 17"of April, 2018.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Heather Carter
Regional Supervisor
By Authority of the Environmental Management Commission
Air Permit No. 08715G04

ATTACHMENT to Permit No. 08715GO4, April 17, 2018
Insignificant/Exempt Activities
I-1
Sand and Aggregate 2Q .0102 (h)(S) No Yes
Handling
1. Because an activity is exempted from being required to have a permit or permit modification
does not mean that the activity is exempted from an applicable requirement or that the owner
or operator of the source is exempted from demonstrating compliance with any applicable
requirement.
2. When applicable, emissions from stationary source activities identified above shall be
included in determining compliance with the permit requirements for toxic air pollutants
under 15A NCAC 2D .1100 "Control of Toxic Air Pollutants" or 2Q .0711 "Emission Rates
Requiring a Permit."
3. Sample permit conditions showing the regulatory requirements for exempt sources subject to
NESHAP,NSPS, and NCAC rules may be found here:
hops://deg.nc.gov/about/divisions/air-quality/air-quality-permits/specific-permit-conditions-
regulator -guide