United States         Office of Air Quality       EPA-456/B-98-003
              Environmental Protection     Planning and Standards     October 1998
              Agency            Research Triangle Park, NC
&EPA       Potential to Emit
               A Guide for
               Small Businesses

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                                                     EPA-456/B-98-003
                                                     October 1998
                         to
   >•••••••••••••••••••••••••••••••••••••••••••••••••!
    I          for
   U.S. Environmental Protection Agency
Office of Air Quality Planning and Standards
   Research Triangle Park, North Carolina
            Printed on paper that contains at least 20
          j percent postconsumer fiber.

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POTENTIAL To  EMIT
                                   Disclaimer
                                   This report has been reviewed by the Office of Air Quality Planning
                                   and Standards (OAQPS), U.S. Environmental Protection Agency
                                   (EPA)  and approved for publication. The statements in this
                                   guidebook are intended solely as guidance, and this guidebook is
                                   not a legally binding document. Contact your state air pollution
                                   control agency or state small business assistance program to
                                   clarify all requirements that may apply to your business.
                                   For more information...

                                   To obtain more information or additional copies of this guidebook,
                                   call your state small business assistance program or your state or
                                   local air pollution control agency. Also, visit the EPAs Technology
                                   Transfer Network - Small Business Assistance Program web site at:
                                   http://www.epa.gov/ttn/sbap to get information on your state
                                   small business assistance program or to find this document and
                                   additional materials concerning this subject. If you do not have
                                   access to the Internet, you can contact EPA's Clean Air
                                   Technology Center (CATC) Hotline at 919-541-0800.

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                                                                          TABLE or  CONTENTS
WHAT IS POTENTIAL TO EMIT?  	1
      What is the purpose of this document?	1
      What is potential to emit?	1
      What pollutants are regulated under the Clean Air Act?  	2
      Do I need to be concerned about "double-counting" these emissions as
      criteria pollutants and HAPs? 	4
      What does it mean if my business is a "major source" of a criteria pollutant?  	4
      What does it mean if my business is a "major source" of HAPs?	5
      Is my business a "minor source" of air emissions?	6
      What air pollution regulations apply to my business?   	6
      How do I know whether my business is a "major" or "minor" source
      of air pollutants? 	7
      What is "maximum capacity?" 	7
      What types of limitations might reduce my maximum capacity?  	7
      Can control measures qualify as limitations on my maximum capacity?  	8
      How can I be sure of my maximum capacity? Do alternatives
      exist if it's hard to figure out my capacity?	9
      Can I qualify as a minor source of air emissions without determining
      my maximum capacity?  	9
      If I already have a permit that limits my capacity or emissions,
      do I need to do anything else? 	11
HOW DO I DETERMINE POTENTIAL TO EMIT?	12
      How do I determine the potential to emit for my business?	12
      Does a screening method exist that can easily tell me if I am a major or minor
      source before I try to determine my potential to emit?	12
      What methods can I use to determine my emissions?   	13
      Which method should I use to calculate emissions?	13
      What information do I need to know to use one of the  methods you
      described to determine my business's potential to emit?  	15
      What are fugitive emissions,  and do they need to be considered
      when calculating my potential to emit?  	16
      How does the number of hours my business operates affect my
      emissions estimates? 	16
      If after calculating my potential to emit my business is above
      major source  levels, what do  I do?	16


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TABLE  or CONTENTS
EXAMPLES OF POTENTIAL TO EMIT	17
      Could you give some examples of how potential to emit is determined?	17
      Example 1: Potential to Emit of a Small Boiler	17
      How does my fuel type determine emissions?  	17
      How can I determine my boiler's rated capacity?  	17
      How can I determine the heating value of my fuel? 	18
      Can I use EPA's screening method to determine if I am a major or minor source?	18
      What method should I use to figure out my emissions? 	18
      Where can I find emission factors?  	18
      How do I figure out the potential to emit for my small boiler using
      an emission factor?  	19
      Am I a major or minor source of emissions?	20
      Example 2: Potential to Emit of a Sheetfed Offset Lithographic Printing Operation  	21
      What is my maximum capacity?	21
      What pollutants do I emit?  	21
      Can I use EPA's screening method to determine if I am a major or minor source?	22
      What method should I use to estimate my air emissions? 	23
      Do I need to add in fugitive emissions or equipment leaks?	23
      What is my potential to emit VOC emissions?	23
      What is my total potential to emit for VOCs?  	25
      What is my potential to emit HAPs emissions?	25
      What is my total potential to emit HAPs? 	27
      Am I a major source of either VOC or HAP emissions? 	27
WHERE CAN I GET MORE INFORMATION? 	28
APPENDIX A: DEFINITIONS 	A-l
APPENDIX B: LIST OF HAZARDOUS AIR POLLUTANTS (HAPs)	B-l

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                                                              WHAT  Is POTENTIAL To  EMIT?
      As a small business, you may have to meet certain
requirements in the Clean Air Act to limit the amount of
pollutants that are released into the air. One way to find out
which requirements apply to you is to figure out your
business's potential to emit. This document answers the
following questions:
• What is potential to emit?
• How do I figure out the potential to emit for my business?

      You  may wish to contact your state air pollution
control agency or state small business assistance program
with questions you have as you read this document
(for who to  contact, see "Where can I get more information?"
on page 28). Also see Appendix C for suggested sources
of information.
   What is the purpose  of
             this document?
      Potential to emit refers to the highest amounts of certain
pollutants that your business could release into the air (even if
you have never actually emitted the highest amount). Potential to
emit considers the design of your equipment. It can also consider
certain controls and limitations on the operation of your business,
as discussed throughout this document.
What  is potential  to  emit?




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WHAT Is POTENTIAL To  EMIT?
                                         It is important to know whether your business is a "major"
                                   or "minor" source of air emissions (how to do this is discussed
                                   throughout this document). Many requirements of the Clean Air
                                   Act only apply to major sources. If your business is not a major
                                   source, then you are considered a minor source. As a minor source,
                                   you may not have to meet certain requirements, or may have
                                   requirements that are easier to meet. Once a business is classified
                                   as a major source, generally its classification cannot be changed to
                                   a minor source except under certain limited circumstances that
                                   involve additional administrative and permitting procedures.

                                         Clean Air  Act requirements for major sources make
                                   sure that:
                                   • Air quality is not made worse.
                                   • Air emissions are controlled.
                                   • Businesses  that  are major sources have operating permits.

                                   To find out whether your business is a major  or minor source of
                                   emissions, you need to figure out its potential to emit certain air
                                   pollutants. Then compare these amounts to the amounts that the
                                   government considers to be "major" releases  of air emissions.
                                   This document will describe how to figure out your emissions.
                                   But first we discuss what pollutants you need to be concerned
                                   about and what amounts of emissions the government considers
                                   to be "major."
What pollutants are
regulated  under the  Clean
Air  Act?
      Pollutants are regulated under the Clean Air Act based
on whether they can have negative effects on people's health or
the environment. Pollutants that are regulated fall into two
main categories:
• Criteria pollutants
• Hazardous air pollutants (HAPs)

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                                                                       WHAT Is  POTENTIAL To  EMIT?
       Appendix A provides definitions of criteria pollutants,
HAPs, and other terms that are commonly used when discussing
air pollutants. Table 1 lists the six criteria pollutants covered by
the Clean Air Act. For ozone, one of the criteria pollutants, "
precursors" are regulated rather than ozone itself. Precursors are
substances that react together to form a pollutant. The precursors
of ozone are volatile organic compounds (VOCs) and nitrogen
oxides (NOX).

Table 1. Criteria Pollutants and Precursors3
Ground-level ozone ("smog")
Precursors: Volatile organic compounds
Nitrogen oxides (NOX)
(VOCs)
Carbon monoxide (CO)
Particulate matter (PM)b
Nitrogen oxides (NOX)
Sulfur dioxide (SO2)
Lead (Pb)
a A precursor of a criteria pollutant is a compound that reacts in the air to produce that pollutant.
b Several categories of particulate matter may be regulated in different states. Contact your
  state air pollution control agency or state small business assistance program to find out
  which categories are covered by your state (for who to contact, see "Where can I get
  more information?").

       The Clean Air Act also regulates  188 hazardous air
pollutants (HAPs),  also known as air toxics. Appendix B provides a
complete list of HAPs. Some HAPs are volatile organic compounds
(VOCs) and count as criteria pollutants as well as HAPs emissions.
HAPs in particle form can also be counted as particulate matter
(PM), another criteria pollutant.

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WHAT  Is POTENTIAL To  EMIT?
Do I need to  be  concerned
about "double-counting"
these emissions  as criteria
pollutants and HiPs?
      When determining your potential to emit, some HAPs
need to be reported as both HAPs and as VOCs or PM. Usually
"double-counting" is only a concern if the emission results will
be used to determine emission fees. To be sure, contact your
state air pollution control agency or state small business
assistance program (for who to contact, see "Where can I get
more information?").
What does it mean if my
business is a "major source"
of a criteria pollutant?
      Contact your state air pollution control agency or state
small business assistance program to find out the emission levels
in your area which classify a business as a major source of criteria
pollutants (also see Table 6 in Appendix A) (for who to  contact,
see "Where can I get more information?"). If your business
qualifies as a major source of criteria pollutant emissions, you
must do two things:
• Get a Title V operating permit.
• Meet emission limits established by your state.

      Title V Permit. Your Title V permit will describe all of
your federal obligations for controlling air pollution (additional
state and local requirements may exist). Examples of common
requirements that may be listed in your permit include:
• Limits on emissions.
• Maintaining progress reports, records, and a compliance schedule.
• Notifying your state air pollution control agency for possibly
  EPA) of any violations of your permit conditions.
• Monitoring your compliance with emission limits/requirements.

      Your specific obligations may vary, so contact your state
air pollution control agency or state small business assistance
program to find out how to obtain a permit and about particular
permit requirements (for who to contact, see "Where can I get
more information?").

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                                                                WHAT Is POTENTIAL  To EMIT?
      State emission limits. Your state sets emission limits for
criteria pollutants in part based on the location for area) of your
business. Location is important because "nonattainment" areas
have stricter emission requirements than "attainment" areas.
Attainment areas are those areas that meet National Ambient
Air Quality Standards (called NAAQS). There is a NAAQS for
each criteria pollutant. Nonattainment areas do not meet
NAAQS. Also, your business may be located in an attainment
area for federal air quality standards, but in a nonattainment
area for state/local standards. To find out whether your business
is located in an attainment or nonattainment area, contact
your state air pollution control agency or state small business
assistance program (for who to contact, see "Where can I get
more information?").
      Your business is a major source of HAPs if it has the
potential to emit either one of the following:
• At least 10 tons per year of any one of the 188 HAPs (listed in
  Appendix B).
• At least 25 tons per year of total HAPs.

      If your business qualifies as a major source of HAPs, then
you must meet certain emission performance standards. To meet
these standards, you must do two things:
• Meet certain air pollution control limits (which are established
  by the federal government based on performance standards that
  have been achieved in practice by a particular type of process or
  machinery).
• Get a Title V operating permit (which will list your air pollution
  control requirements).

      For certain industries, the federal government may not yet
have set performance standards. If this is true for your business,
then you may only have to get a Title V operating permit for now
to meet federal requirements. Or, state air pollution control agencies
may determine performance standards on a case-by-case basis  for
some types of industries. In addition, a business that is a major
source of HAPs may also have to meet state or local requirements.
Contact your state air pollution control agency or state small
business assistance program to find out your requirements (for
who to contact, see "Where can I get more information?").
      What does it mean
      if my business  is  a
"major source" of HAPs?

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WHAT Is  POTENTIAL To  EMIT?
Is my business a "minor
source" of air  emissions?
       Businesses that cannot emit as much criteria pollutants
or HAPs as a major source are called minor sources. Your business
can qualify as a minor source of air emissions if it meets one of
the following:
• Your potential to emit criteria pollutants or HAPs is below
  major source levels.
• Your potential to emit is at or above major source levels, but
  you limit your operations or emissions in certain ways. Generally,
  if your business qualifies as this type of minor source, you will
  need to get a permit through your state air pollution control
  agency.1 The limits on your operations or emissions that might
  qualify you as a minor source include:
     • You follow specific requirements to use, operate, and
       maintain air pollution control devices.
     • You follow specific requirements to restrict operations
       to a certain amount of time.
     • You use specified restrictions on the types and
       amounts of input materials used (for example,
       fuel usage or solvent usage).

       If your business has any of the limits discussed above that
qualifies it as a minor source, you will probably be required to
keep records or other information to show that your business is
operating within its limit.
What air  pollution
regulations  apply to
my  business?
       The regulations that apply to your business depend on
the types and amounts of criteria pollutants (see Table 1) and
hazardous air pollutants (HAPs, see Appendix B) that you emit or
have the potential to emit. Whether your business is a major or
minor source of air emissions, contact your state air pollution
control agency or state small business assistance program to find
out what regulations apply (for who to contact,  see "Where can
I get more information?").
                                    1  In some states, certain businesses that have very low actual emissions may not need to go
                                      through the permitting process; instead, they may be able to become a minor source by
                                      meeting industry-specific requirements in federal, state, or local regulations.

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                                                             WHAT Is POTENTIAL To  EMIT?
      You need to consider two factors to determine whether
your business is a major or minor source of air emissions:
• Your business's "maximum capacity."
• Air pollution regulations and policies that apply to your business,
 particularly those that affect your potential to emit by limiting
 your maximum capacity.

      Both of these factors are discussed below.
 How do  I know  whether
my  business is a "major"
      or "minor" source of
             air  pollutants?
      Your business's maximum capacity is based on the
amount of input materials used and products produced by each
piece of equipment you have. Begin by assuming that your business
operates continuously throughout the year (which equals 8,760
hours). Generally you must assume the highest amounts of
inputs and products possible, which result in the highest level
of air emissions.

      However, when certain limitations (that can be confirmed
by regulators) are present at your business, you may instead
base your maximum capacity on the amount of input materials
that can be used and the products that can be produced given
these limitations.
       What is "maximum
                 capacity?"
      The limitations present at your business must be
unchanging and unavoidable physical constraints in order to
reduce your maximum capacity. These constraints must result in
predictable upper limits on your operations and capacity. (Note
that changeable market conditions or business plans do not
qualify to limit your operations and capacity.)
What  types  of limitations
          might reduce my
       maximum capacity?


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WHAT Is POTENTIAL To EMIT?
                                         A common type of limitation that could reduce your
                                   maximum capacity might involve setting limits on operating rates
                                   or operating times of equipment. For example, in a paint-spraying
                                   booth at a small autobody shop, there is a limitation on the number
                                   of cars that can be painted and dried in a given amount of time
                                   because of the time it takes to perform each task required (e.g.,
                                   preparation of the surface, painting, drying, etc.). In figuring out
                                   the maximum capacity of such a business, the owner does not
                                   have to assume that the paint-spray ing equipment operates every
                                   hour throughout the year. Instead, he or she can assume that it
                                   operates only as much as is  necessary to paint the maximum
                                   number of cars that the booth can handle if operated every hour
                                   throughout the year.

                                         Another example is limitations in the operation of country
                                   grain elevators. These businesses  serve a limited and generally
                                   unchanging geographic area that can produce only a  finite amount
                                   of grain. While the amount of grain harvested might fluctuate,
                                   local grain production  generally will not exceed a certain upper
                                   limit. It is this upper limit that forms the basis for determining a
                                   grain elevator's maximum capacity.

                                         Similarly, the operation of emergency generators is limited
                                   to a certain number of hours — the number of hours for which
                                   the emergency generator must substitute for regular power. An
                                   upper limit of the number of hours the generator will operate can
                                   be estimated quite accurately. The upper limit of hours of operation
                                   will be much less than the 8,760 hours per year that is normally
                                   assumed to determine maximum  capacity.
Can control measures
qualify as  limitations  on
my  maximum capacity?
      Control measures can qualify as limitations that reduce
your maximum capacity only if they are operated and maintained
continuously for reasons other than air quality protection.
Examples of using controls for purposes other than for air quality
include: quality control, product recovery, or operating efficiency.
For example, at a dry cleaning facility, a closed loop dry cleaning
machine may be used for operating efficiency. As a side effect,
emissions of HAPs and VOCs may also be reduced.

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                                                               WHAT Is POTENTIAL To  EMIT?
      Check with your state air pollution control agency or
state small business assistance program if you are unsure of your
maximum capacity (for who to contact, see "Where can I get
more information?"). Agencies realize that uncertainties exist in
determining capacity, particularly for certain types of processes,
that may make it difficult to figure out what a business's maximum
capacity is. And yes, there are alternatives to figuring out your
own maximum capacity. In some cases, it may be easier for a
business to accept a limit set by the state (called an "enforceable
limit"), such as one that already exists in a permit, rather than
trying to figure out your maximum capacity.

      You can also get guidance documents and policy memoranda
that discuss limitations (known as "inherent limitations")  on
maximum capacity from your state air pollution control agency
or state small business assistance program. These materials
offer further assistance on maximum capacity. Appendix C
("References") includes some of these materials. Also check out
this information  on the Internet at: http://www.epa.gov/ttn/oarpg
    How  can I be sure  of
  my  maximum capacity?
  Do  alternatives exist if
    it's hard to  figure out
              my capacity?
      A business can qualify as a minor source through certain
permit and other options without determining maximum capacity.
Check with your state air pollution control agency or state small
business assistance program for information on these options,
which include:
• Case-by-case permits for construction and/or operation.
• General permits for a specific type of business.
• Meeting certain conditions (known as "prohibitory rule");
  this option does not require applying for a permit).
Can I qualify as a  minor
  source  of air  emissions
  without determining  my
       maximum  capacity?


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WHAT Is POTENTIAL  To EMIT?
                                          The last option listed above applies to certain types of
                                   businesses that are known to have low emissions. Some states
                                   have programs that make it easy to get prohibitory rule limits,
                                   such as mailing in a postcard in which the business owner agrees
                                   to meet certain limits. EPA expects that prohibitory rule limits
                                   will be used increasingly in the future and has developed guidance
                                   on this option (see the references in Appendix C: "Potential to
                                   Emit Guidance for Specific Source Categories" and "Technical
                                   Support Document for Potential to Emit Memo.")

                                          Other options also exist. Permits or other conditions can
                                   be applied that reduce your potential to emit based on one or
                                   more of the following:
                                   • The use of emission control devices.
                                   • Restrictions on the rate or time of operations.
                                   • Limitations on the amounts or types of raw materials used.

                                          Businesses using such options are generally required to
                                   keep adequate compliance records and to report regularly to state
                                   air pollution control agencies.

                                          In addition, some states have chosen to follow a temporary
                                   EPA "transition policy" (until December 31, 1999). This policy
                                   allows a business to be treated as  a minor source if the business
                                   maintains records showing that its actual emissions are less than
                                   50 percent of major source levels. Also, if a business has actual
                                   emissions between 50 and 100 percent of major  source levels,
                                   it may qualify as a minor source by meeting state limits on its
                                   potential to emit (e.g., through a permitting program). Not all states
                                   use this optional policy, so check with your state air pollution
                                   control agency or state small business assistance program to find
                                   out whether your state offers this option (for who to contact,
                                    see "Where can I get more information?"). After this temporary
                                   transition policy ends, most businesses with low emissions
                                   should be able to qualify as a minor source through any of the
                                   methods discussed above.


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                                                               WHAT  Is  POTENTIAL  To EMIT?
      If your business meets the following criteria, there's a good
chance that you are complying with limits for the potential to emit:
• Your emission controls are permanent.
• Your business is legally obligated to obey conditions for potential
 to emit limits.
• Your potential to emit limits do  not relax state requirements
 already accepted by EPA.
• Your limitations on potential to  emit are technically accurate
 and quantifiable.
• Your records of emissions allow  for monthly compliance checks
 by government agencies.
• Your recordkeeping, reporting, and monitoring are sufficient to
 demonstrate compliance.

      Not all permit limits  meet these requirements. Also, a
single permit limit does not  guarantee that you are a minor
source for all pollutants. You must still be a minor source for
all pollutants to  qualify as a  minor source. To do this, you must
determine your potential to emit for each pollutant, including
HAPs. Check with your state air  pollution control agency or
state small business assistance program to find out more about
different types of limits (for who  to contact, see "Where can I
get more information?").
If I already  have  a permit
that limits my  capacity or
     emissions, do I need to
           do  anything else?



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How  Do  I DETERMINE  POTENTIAL To EMIT?
How do I  determine  the
potential to  emit for
my  business?
       Your maximum capacity determines your potential to
emit. So, once you've identified your maximum capacity for have
chosen alternatives, such as permit limits or other state limits),
as described above, you can determine your potential to emit.
The steps involved in determining your emissions are presented
in Box 1. Specific methods for figuring out your potential to emit
are described below.

Box 1. Basic Steps for Determining Emissions
                                       1.   Identify all sources of emissions.

                                       2.   Identify all criteria pollutants and hazardous air pollutants (HAPs)
                                           that your business emits. (Note that other types of pollutants may
                                           also be regulated and require a Title V permit; check with your state
                                           air pollution control agency or state small business assistance
                                           program for a list of all regulated air pollutants. For who to contact,
                                           see "Where can I get more information?").

                                       3.   Select a method to use from Table 2 below to determine
                                           your emissions.

                                       4.   For each criteria and hazardous air pollutant, determine the
                                           maximum amount that each production process or piece of
                                           equipment in your business can emit in one year.

                                       5.   For each criteria and hazardous air pollutant, add the maximum
                                           emissions from all production  processes/equipment.
Does  a screening  method
exist  that  can easily tell
me  if I am  a  major or
minor source  before
I try to  determine  my
potential to  emit?
       Yes. EPA has developed guidance that you can use to
quickly determine if you are a major or minor source (see EPA,
1998a in the Reference section [Appendix C]. The screening
method covers pollutants and materials that are of the greatest
concern for different types of businesses. The method includes
cutoff levels for materials that you may use (e.g., solvents, etc.).
If you use less than the cutoff level for a certain material, then
you are probably a minor source. In all cases, you should confirm
your results with your state air pollution control agency. If the
screening method does not apply to you, then you can use the
procedures described below to  determine your potential to emit.


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                                                     How  Do  I DETERMINE  POTENTIAL To EMIT?
       You can use one of the following four methods to
determine your emissions:
• Use test data fonsite measurements).
• Use a material-balance approach (comparing inputs and outputs).
• Use source-specific models (based on information about your
  business's operations).
• Use emission factors (based on industry-average emission rates)

       Table 2 describes these methods in more detail.

Table 2. Emissions Calculation Methods
                                  What methods can  I  use
                              to  determine  my  emissions?
  Method
  Test data
Description
Onsite measurement of emissions.
  Material-balance calculations
Estimate emissions by comparing types and quantities of inputs to types and
quantities of outputs.
  Source-specific models
Formulas for emissions using source-specific parameters such as types and
quantities of inputs, operating hours, and physical characteristics of equipment.
  Emission factors
Uses average pollutant emission rates (provided by EPA, other agencies, or
equipment vendors), multiplied by time or frequency of operation, to obtain
emissions. Emission factors specific to your business can be used but should
be approved by the state air pollution control agency.
       It depends on the type of business and types of emissions
you have, what information and resources are available, and the
degree of accuracy required. Consult your state air pollution control
agency or your state small business assistance program before
choosing a particular method (for who to contact, see "Where can I
get more information?"). Different methods may be used for
different types of emissions. Whichever method you use, when
you determine your potential to emit, assume that no pollution
controls  are in place. Each of the methods is discussed below to
help you decide which method best suits your business.
                                Which method should  I use
                                    to  calculate  emissions?

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How  Do  I DETERMINE POTENTIAL To EMIT?
                                    1. Test data method. This method can provide the most accurate
                                      estimates of emissions. Unfortunately the data needed are often
                                      expensive to obtain, particularly for businesses that emit a
                                      variety of pollutants or have a lot of "fugitive emissions."
                                      (Fugitive emissions are those resulting from leaks or nonlocalized
                                      escape, such as from spraying operations. Fugitive emissions
                                      are discussed in more detail later in this document—see the
                                      question: "What are fugitive emissions...?".) Useful test data
                                      are easier to obtain when emissions come primarily from a
                                      point source, such as a smokestack. It may be necessary to
                                      collect test data over a period of time and from multiple
                                      production areas to gain a reliable measure of average emissions.
                                      Only experienced stack testers should measure emission samples
                                      and estimate total emissions.
                                    2. Material-balance approach. This method is appropriate for
                                      businesses that lose a high percentage of input material to the
                                      atmosphere (such as solvents in degreasing, cleaning,  and coating
                                      processes). A material-balance approach can be problematic
                                      for operations in which: inputs are consumed; inputs are
                                      chemically combined;  or losses to the atmosphere make up
                                      only a small part of the total throughput. The material-balance
                                      approach requires accurate records of the amounts of material
                                      used and the waste generated; such records often can be
                                      difficult to maintain.
                                    3. Source-specific models. These models are available for only
                                      a relatively small number of industrial operations. If you  want
                                      to use this method, you must make sure that the formulas
                                      used are relevant to your particular business. You also must
                                      determine correct values for parameters that are plugged
                                      into the equations.
                                    4. Emission Factor method. This method uses EPA emission
                                      factors that represent industry averages. An emission factor
                                      shows the relationship between an  air emission and a measure
                                      of production (e.g., pounds of SCh per  1,000 gallons of input).
                                      Equipment-specific emission factors can often be obtained from
                                      equipment vendors, especially through emission performance
                                      guarantees or from actual test data of similar equipment. It is
                                      important to use factors that are relevant for a particular
                                      production process. Emission factors should  account for periods
                                      of disrupted operation as well as routine operation. While this
                                      method has some limitations (e.g., it is simplistic and lacks
                                      specific data), it is often the best or only practical means  for
                                      estimating emissions.

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                                                  How  Do  I  DETERMINE  POTENTIAL  To EMIT?
      EPA has developed emission factor ratings ranging from
best-to-worst (A through E) which can be found in EPA's AP-42
document (see reference in Appendix C). These ratings indicate
the appropriateness of using the EPA factors to estimate average
emissions in a particular industry. Specific emission factors based
on your business can be used instead of EPA emission factors, but
should be approved by the state air pollution control agency. It
should be noted that emission factors are not EPA-recommended
emission limits or standards.

      You can obtain further information on methods for
determining potential to emit from state air pollution control
agencies, state small business assistance programs, EPA, trade
associations, and vendors. It is important to remember that you,
the business owner or operator, are ultimately responsible for
using the best data available. Your data should be accurate and
representative of your emissions. If you had reasonable access to
better sources of data but did not use the information because
you received poor advice, you remain responsible for not using the
best available data.
      The information you need to determine your potential to
emit depends on the method you selected. The emission-factor
method, which is the simplest of the four methods described
above, generally requires only the appropriate emission factors
and the maximum operation rates of your business processes.
For source-specific models, you need to know a greater variety of
information, such as the chemical composition of the inputs, the
temperatures at which processes occur, and the dimensions of
the equipment used. Material-balance and test data methods
require a number of specific measurements made at the business
establishment itself.

      You must estimate emissions for all pollutants emitted
by your business, whether criteria air pollutants or hazardous air
pollutants (HAPs). (See Table 1 for a list of criteria pollutants
and Appendix B for a list of the 188 EPA-regulated HAPs.) Your
estimates must be based on the collective total of emissions
from a particular business (e.g., if a business has five printing
lines, potential to emit must be based on the total emissions
from all five lines).
     What  information do  I
       need to  know  to use
   one  of  the  methods you
described  to determine my
         business's potential
                     to  emit?

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How  Do I  DETERMINE POTENTIAL To  EMIT?
What  are fugitive  emissions,
and do  they need  to  be
considered when calculating
my potential to emit?
      Fugitive emissions refer to air pollutant emissions that
enter the atmosphere from a business without first passing
through a stack or duct designed to direct or control their flow.
While air emissions often do pass through a stack or duct for are
otherwise captured) before being discharged to the atmosphere,
some fugitive emissions typically escape the system without
being captured.

      Depending on the purpose of your potential to emit
calculation, you may or may not be required to include fugitive
emissions. Also, some regulations require certain types of busi-
nesses to include fugitive emissions when determining their
potential to emit. Contact your state air pollution control agency
or state small business assistance program for guidance on
whether to include fugitive emissions in your potential to emit
(for who to contact, see "Where can I get more information?").
How does the  number
of hours  my business
operates  affect  my
emission  estimates?
      As discussed earlier, in determining potential to emit
you should assume that equipment operates every hour of the
year (8,760 hours per year), unless certain limitations affect how
much your business can operate (see the earlier question, "What
is maximum capacity?" which describes these limitations).
If such limitations are present, you should assume that your
equipment operates for the maximum number of hours allowed
by the limitations. In the case of batch operations, when emissions
are not continuous in time, determine your potential to emit by
multiplying the emissions per batch by  the maximum number of
batches per year.
If after  calculating  my
potential to emit my
business  is  above major
source levels, what  do  I do?
      If your potential to emit is just above major source levels,
carefully check and document any assumptions used in your
calculation. If your numbers are correct, you might still qualify as a
minor source if you limit your operations in certain ways (see the
earlier question, "Is my business a minor source of air emissions?")

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                                                          EXAMPLES Or  POTENTIAL To  EMIT
      Below are two examples of how to determine potential
to emit. The first is for a small boiler, the second is for a
lithographic print shop. The small boiler example uses
emission factors. The print shop example uses the material-
balance approach.
      Could you give some
examples of how potential
    to emit is determined?
      A small business operates a boiler for process heating.
The boiler fires exclusively natural gas. According to the state air
pollution control agency, the major source level for all criteria
pollutants for the area in which this business is located is 100
tons per year. Emissions are determined based on:
• The type of fuel burned
• The rated capacity of the boiler (this is your maximum capacity)
• The heating value of the fuel
• Maximum potential hours of operation per year
• Emission factors for pollutants

      The boiler typically operates at or close to its maximum
of 8,760 hours/year. The rest of the items listed above are
discussed below.
            Example  1:
        Potential to Emit of
              a Small Boiler
      Different fuels result in different types and amounts of
pollutants due to the specific composition of the fuel.
    How does my fuel type
     determine emissions?
      Most manufacturers place a metal plate on the boiler that
identifies the boiler's rated capacity. The rated capacity should
also be contained in the manufacturer's literature or operations
manual. The rated capacity should be in units of "million British
thermal unit per hour" (MMBtu/hr). For this example, the rated
capacity of the boiler was listed on the boiler as 15 MMBtu/hr.
   How can I determine my
   boiler's rated capacity?







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EXAMPLE  1: SMALL  BOILER
How can I determine the
heating value of my fuel?
      Your fuel supplier can provide you with this information.
If you are unable to contact the supplier, you can instead use
average values from Appendix A of EPA's AP-42 document (which
is listed in the References section). For this example, the heating
value of the natural gas is 1,050 MMBtu per MMcf (which stands
for million British thermal units per million cubic feet of gas),
based on information from the fuel supplier.
Can I use EPA's screening
method to determine
if I  am a major or
minor source?
      Yes. According to EPA's screening method (see EPA,
199 8 a in the References in Appendix C), if you burn no more than
710 million cubic feet per year, you are probably a minor source
for all pollutants. Since in this example your boiler capacity is
15 MMBtu/hr, at a heating value of 1,050 MMBtu/MMcf, your
maximum fuel burning rate is 0.014 MMcf/hr (15 MMBtu/hr
divided by 1,050 MMBtu/MMcf = 0.014 MMcf/hr). At 8,760 hours
per year, your maximum annual fuel burned is 123 MMcf/yr
(0.014 MMcf/hr x 8,760  hr/yr = 123 MMcf/yr). Since 123 MMcf/yr
is below the 710 MMcf/yr cutoff, you are probably a minor source.
You should confirm this information with your state air pollution
control agency. If the screening method is not sufficient to deter-
mine whether you are a  major or minor source, you can use the
procedures described below to determine your potential to emit.
What method should I use
to figure out my emissions?
      Emission factors are appropriate to use for this example
because they are the only practicable and economically feasible
method for this business.
Where can I find
emission factors?

      EPA's AP-42 document (listed in the References in
Appendix C) contains emission factors for boilers firing natural
gas (see Section 1.4 and Tables 1.4-1, 1.4-2, and 1.4-3 of AP-42}.
Also check with your state air pollution control agency or small
business assistance program because some agencies have additional
emission factors that should be used (for who to contact, see
"Where can I get more information?"). Table 3 lists emission factors
for small boilers from EPA's AP-42 document.


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Table 3. Pollutant Emission Factors for a Small Boiler3
Pollutant Emission Factor
SO2
NOx
CO
VOC
PM
0.6 Ib/MMcf
140lb/MMcf
35 Ib/MMcf
5.8 Ib/MMcf
13.7 Ib/MMcf
a  Emission factors obtained from EPA's AP-42, Tables 1.4-1, 1.4-2, and 1.4-3 (see Reference
  list in Appendix C)
                                                                        EXAMPLE  1: SMALL BOILER
                                                                        How do I figure out the
                                                                       potential to emit for my
                                                                          small  boiler using an
                                                                               emission factor?
       For each pollutant, you need to:
• Determine the "hourly heat input": divide the boiler's
  rated capacity by the heating value of the fuel to get the
  hourly heat input.
• Then multiply the hourly heat input by the emission factor
  for the pollutant of concern to get the emission  rate.
• Multiply the  emission rate by the maximum hours of
  operation per year. The result will be the pounds of the
  pollutant emitted each year.
• Finally, you need to change the annual emissions from pounds to
  tons; you do this by dividing your annual emissions in pounds
  by 2,000 (because there are 2,000 pounds in 1 ton).

       Box 2 summarizes the procedure for figuring out the
potential to emit for the boiler in this example:

Box 2. Potential to Emit for a Criteria Pollutant
                          Potential to Emit for a Criteria Pollutant (in tons/year)
  Step 1:    Rated capacity of the boiler (in MMBtu) -^ Heating value of the fuel (in MMBtu/MMcf) = hourly heat input (in MMcf per hr)

  Step 2:    x Emission factor (in Ib per MMcf) = emission rate (in Ib per hr)

  Step 3:    x Maximum hours of operation (in hours per year) = annual potential to emit (in Ib of emissions per year)

  Step 4:    Now, change from Ib to tons by dividing by 2,000: -r 2000 Ib = tons of pollutant per year




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EXAMPLE  1: SMALL  BOILER
Box 3. The potential to emit NOX is determined as:
                                      Potential to Emit NO,
Sfep 1:
Step 2:
Step 3:
Step 4:
15 MMBtu per hour -=- 1
(rated capacity)
x 140lbNOxperMMcf
(emission factor)
x 8,760 hours per year
(maximum hours of operation)
-f 2,000 Ib = 8.6 tons
,050 MMBtu per MMcf
(heating value of fuel)
1 .96 Ib NOX per hr
(emission rate)
17,170 Ib
(annual potential
of NOX per year
0.014MMcf/hr
(hourly heat input)

NOX per year
to emit, in Ib per year)

                                        Potential to emit for the other pollutants is calculated in
                                  the same way; Table 4 displays the results:

                                  Table 4. Potential to Emit for Small Boiler
Pollutant Potential to Emit
SO2
NOX
CO
VOCs
PM
0.038 tons/year
8.6 tons/year
2.2 tons/year
0.34 tons/year
0.86 tons/year
Am I a major or minor
source of emissions?

      The values determined above for the potential to emit
show that this boiler is a minor source because its emissions of
criteria pollutants lie below major source levels for criteria
pollutants in this area (the major source levels were obtained
from the state air pollution control agency), and this business
does not emit HAPs.


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                                                            EXAMPLE 2: PRINTING OPERATION
      A small printing company operates several sheetfed offset
lithographic presses. Instead of figuring out its maximum capacity,
the company has accepted an operating limit from the state of
16,000 pounds of ink per year, and 1,350 gallons of total solvent
per year with an average VOC content of 6.6 pounds per gallon.
These limits are based on the company's best estimate of the
maximum amounts of inks and solvents that will be used. (If the
business owner were to determine maximum capacity instead of
accepting a predetermined limit from  the state, he or she would
need to determine the maximum operating schedule, line speed,
and drying time, which might be difficult to figure out.)
             Example 2:

      Potential to Emit of a
             Sheetfed Offset
      Lithographic Printing
                   Operation
  For ink: 16,000 pounds of ink per year, which is the operating
  limit you accepted from the state.
  For solvents: 1,350 gallons of total solvents per year with an
  average VOC content of 6.6 pounds per gallon, which you also
  accepted as a limit from the state.
                 What is my
       maximum capacity?
      The ink, cleaning solvent, blanket wash solvent, and
fountain solution you use all contribute to VOC and HAP
emissions. You can get some of the information you need from
your state air pollution control agency, state small business
assistance program, and Material Safety Data Sheets (MSDS)
located at your business, including:
• Find out from your state air pollution control agency or state
  small business assistance program what the major source level
  for VOCs is. (For this example, according to the state agency,
  the major source level for VOCs is 50 tons per year.)
• Comparing your MSDS with the list of HAPs in Appendix B of
  this document tells you that you emit the following HAPs from
  your inks and solvents:
      toluene
      ethylene glycol
• Look at your MSDS to determine the specific VOC and HAP
  content of the inks and solvents you use.

      Table 5 lists the relevant input materials, their maximum
usage rates, and their VOC and HAP content based on the MSDS.

What pollutants do I emit?






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EXAMPLE  2:  PRINTING OPERATION
Table 5. Maximum Usage and Pollutant Content of Inputs
Material Usage VOC Content HAP Content
Ink
Cleaning Solvent
Blanket Wash Solvent
Fountain Solution
16,000 Ibs/year
600 gal/year
500 gal/year
250 gal/year
1 0% by weight
(which =
10lbVOCper
100lbink)
6.9 Ib/gal
6.2 Ib/gal
6.8 Ib/gal
0 Ib/gal
0 Ib/gal
2.3 Ib/gal toluene
1 .2 Ib/gal ethylene glycol
Can I use EPA's screening
method to determine if
I am a major or
minor source?

      Yes. According to EPA's screening method (see EPA,
1998a in Appendix C), if your printing business:
• Uses less than 7,125 gallons of cleaning solvent and fountain
  solution per year, you are probably a minor source for VOCs.
• Uses less than 3,333 gallons of all materials that contain
  hazardous air pollutants and less than 1,333 gallons of material
  containing any one HAP, you are probably a minor source
  for HAPs.

      Since, in this example, you have accepted a limit of 1,350
gallons of total solvent per year, you are probably a minor source
for VOCs and total HAPs. Based on the solvent data in Table 5,
the maximum solvent usage for any one HAP is the 500 gallons
per year blanket wash solvent, which contains toluene. Because
this is less than 1,333 gallons, you are probably also a minor source
for any individual HAP. You should confirm this information
with your state air pollution control agency or state small business
assistance program (for who to contact, see "Where can I get
more information?"). If the screening process is not  sufficient to
determine whether you are a major or minor source, use the
procedures described below.


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                                                           EXAMPLE  2:  PRINTING OPERATION
      Because of the information you now know, which
includes: fl) your maximum capacity for limits accepted from
the state), and (2) the VOC content and the HAPs content of
the materials you use (listed in your MSDS), using a material-
balance method is appropriate (assuming that all VOCs and
HAPs are emitted).

      According to the MSDS, the VOC content of your ink can
vary from 5 to 10 percent by weight. Because potential to emit is
based on the assumption of maximum VOC content, you need to
use 10 percent.
 What method should I
     use to estimate my
         air emissions?
      According to the state small business assistance program,
your business is not required to include fugitive VOCs in potential
to emit calculations for a Title V permit. Fugitive HAPs, however,
do need to be included. By using the material balance method to
estimate potential to emit, you are assuming that all VOCs and
HAPs are emitted. Therefore, fugitive emissions and equipment
leaks are included in this estimate.
     Do I need to add in
  fugitive emissions or
      equipment leaks?
      Determine your VOC emissions by using
the following steps:
• Determine the potential to emit VOCs from each material used
  (e.g., ink, solvents, solutions). To do this, multiply a material's
  usage by its VOC content (see Table 5 for usage and VOC content).
• Add the individual VOC emissions together. The result will be
  in pounds of VOCs per year.
• Change from pounds of VOCs per year to tons of VOCs per year.
  Do this by dividing the result you have by 2,000 (because there
  are 2,000 pounds in 1 ton).

      You can use the equations summarized in Box 4 to carry
out the above steps:
What is my potential to
  emit VOC emissions?









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EXAMPLE  2: PRINTING  OPERATION
Box 4. How to Determine Potential to Emit VOC Emissions
                                         VOC emissions, in tons/year
   Step 1:      Determine potential to emit VOCs from the ink, solvents, and solution:
           Ink usage (from Table 5)
               (in Ibs per year)
  VOC content (from Table 5)
   (in IbofVOC per Ib of ink)
   and also:
       Solvent and solution usage (from Table 5)
                   (in gal per year)
              VOC content (from Table 5)
                (in Ib of VOC per gal of
                 solvents and solution)
   Step 2:      Add together the individual results for the ink, solvents, and solution:

      Ib VOC per yr  +         Ib VOC per yr       +          Ib VOC per yr
        (from ink)           (from the cleaning solvent)         (from the blanket wash solvent)

   Step 3:      Change from Ib per year to tons per year:

       total Ib VOC per year     +     2000     =     tons total VOCs per year
                                                   Ib VOC per yr
                                               (from the fountain solution)
Thus the VOC emissions from the ink are:
   Ink:
         16,000 Ib peryr of ink
                (usage)
x       10lbofVOCper100lbofink
                (VOC content)
 1,600 Ib of VOCs
per year from ink
The VOC emissions from the solvents and solution are:
   Cleaning solvent:

    600 gal per yr of cleaning solvent      x   6.9 Ib VOC per gal of cleaning solvent
                (usage)                                  (VOC content)

   Blanket Wash Solvent:

   500 gal per yr of blanket wash solvent   x 6.2 Ib VOC per gal of blanket wash solvent
                (usage)                                  (VOC content)

   Fountain Solution:

    250 gal per yr of fountain solution      x   6.8 Ib VOC per gal of fountain solution
                (usage)                                  (VOC content)
                                                 4,140 Ib per year
                                                 of VOCs from the
                                                 cleaning solvent


                                             3,100 Ib per year of VOCs
                                                 from the blanket
                                                   wash solvent
                                                  1,700 Ib per year
                                                 of VOCs from the
                                                 fountain solution
(Note that changing from pounds to tons per year will be done later.)

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                                                              EXAMPLE  2:  PRINTING  OPERATION
      To find the total VOC emissions from this printing
business, add up all of the individual VOC emissions above as
shown in Box 5:

Box 5. Total Potential to Emit VOCs
                                                      What is my total
                                          potential to emit for VOCs?
                                     Total Potential to Emit VOCs:
   1,600 Ib VOC per yr
       (from ink)
4,140lbVOCperyr
(from cleaning solvent)
 3,100lbVOCperyr
(from blanket wash solvent)
1,700 Ib VOC per yr  =
(from fountain solution)
10,540 Ib of total
 VOC per year
  Now, change from Ib of VOCs to tons of VOCs by dividing by 2,000: 10,540 + 2,000 = 5.27 tons per year of total VOCs
      This result shows that this printing company could be
only a minor source of VOC emissions (which can contribute to
criteria pollutants), since the maximum VOC emissions are less
than the major source level of VOCs, which is 50 tons per year.
      Determine your potential to emit for HAP emissions in
the same way you did for VOC emissions. That is, for a particular
kind of HAP, first figure out separately the maximum HAPs that
could be emitted from each individual input material used fin this
case, the blanket wash solvent and fountain solution). Determine
your potential HAP emissions from each of these materials by
using the following steps:
• Determine the potential to emit HAPs from each material used
  (e.g., solvents, solutions). To do  this, multiply a material's  usage
  by its HAP content (see Table 5  for usage and HAP content).
• Change each individual HAP emission from pounds of HAP per
  year to tons of HAP per year. Do this by dividing the result you
  have by 2,000  (because there are 2,000 pounds in 1 ton).
• Add the individual HAP emissions  together  to get total
  HAPs emissions.

      You can use the equations  summarized in Box 6  to
carry out the above steps:
                                              What is my potential to
                                               emit HAPs emissions?








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EXAMPLE 2:  PRINTING  OPERATION
Box 6. Potential to Emit HAP Emissions
   Step 1:
   Step 2:
   Step 3:
                                         Potential to Emit HAP Emissions
Determine potential to emit HAPs from the solvents and solution:

Solvent and solution usage in gal per year x  HAP content of the material in Ib per gal of solvents and solution

Change each HAP emission from Ib per year to tons per year:

       Ib HAP per year   ^  2000   =   tons HAP per year

Add together the individual results for the solvents and solution:
                   tons HAP per yr
               (from the blanket wash solvent)
                                  tons HAP per yr
                                (from the fountain solution)
tons of total HAPs per year
                                               For this example, first figure out the potential to
                                        emit for the individual HAPs: toluene and ethylene glycol,
                                        listed in Table 5, as follows:
   Toluene from the blanket wash solvent:

   500 gal per yr of blanket wash solvent   x
               (usage)
                           2.3 Ib of toluene per gal of blanket wash solvent
                                          (HAP content)
                   1,150lb
              of toluene per year
               from the blanket
                 wash solvent
   Change from pounds to tons: 1,150 Ib of toluene per year  ^   2000  =   0.575 ton toluene per year


   Ethylene glycol from the fountain solution:

   250 gal per yr of fountain solution  x   1.2 Ib of ethylene glycol per gal of fountain solution  =  300 Ib of ethylene glycol
               (usage)                                 (HAP content)                         per year from the
                                                                                         fountain solution

   Change from pounds to tons: 300 Ib of ethylene glycol per year +•   2000  =   0.15 ton ethylene glycol  per year



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                                                            EXAMPLE  2:  PRINTING OPERATION
      To find the total HAP emissions from this printing
business, add up all of the individual HAP emissions above,
as follows:
         0.575 ton per yr
  (of toluene from the blanket wash solvent)
                                    Total Potential to Emit HAPs:
        0.15 ton per yr
(of ethylene glycol from the fountain solution)
                              What is my total potential
                                          to emit HAPs?
0.725 tons per year of total HAPs
      This result shows that the printing company could be
only a minor source of HAP emissions, since its individual HAP
emissions all lie below 10 tons per year (which is the major
source level for individual HAPs),  and its total HAP emissions
are less than 25 tons per year (which is the major source level
for total HAPs).
      No, the printing business in this example is not a major
source; it is a minor source of both VOC and HAP emissions
because its emissions fall below the major source levels for both
VOCs and HAPs.
                                 Am I a major source of
                                            either VOC or
                                        HAP emissions?








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WHERE CAN I GET MORE  INFORMATION?

                                  Where can I get more information?

                                  The Small Business Assistance Program has an Internet web site at:
                                  http://www.epa.gov/ttn/sbap. Through this web site you can obtain
                                  information pertinent to small businesses, including a list of small
                                  business assistance program contacts (click on "Contacts and
                                  Resources"). If you do not have access to the Internet, you can call
                                  EPA's Clean Air Technology Center Hotline at 919-541-0800 for a list
                                  of state small business assistance program contacts or for more
                                  information on potential to emit and related subjects.

                                  Also, the EPA's Technology Transfer Network (TTN), available
                                  through the Internet at: http://www.epa.gov/ttn, provides the
                                  public with a  variety of air emissions materials, including the text
                                  of the Clean Air Act, EPA guidance documents, and software. The
                                  Small Business Assistance Program's web site can also be accessed
                                  from the TTN main home page (click on "Technical Sites," then
                                  click on "SBAP," then click on "Contacts and Resources" for a list
                                  of state small business assistance program contacts). The TTN
                                  help-line number is (919) 541-5384.

                                  The TTN web site also contains the EPA Office of Air and Radiation's
                                  Policy and Guidance site at: http://www.epa.gov/ttn/oarpg, which
                                  contains policy memoranda on potential to emit and related topics
                                  mentioned in this document. The references in Appendix C of
                                  this document also provide a partial list of relevant EPA guidance
                                  documents and policy memoranda.

                                  The CHIEF web site accessed through TTN provides information
                                  on emission factors through resources such as AP-42 and the
                                  Locating and  Estimating series and through software such as the
                                  Factor Information and Retrieval (FIRE) system. Software for some
                                  emission models is available through the CHIEF web site.


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Appendix A
  Definitions

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Appendix  A: Definitions
Appendix  A: Definitions
Attainment area: A geographical area that meets National Ambient
Air Quality Standards (NAAQS) for criteria air pollutants.

Criteria air pollutant: One of six air pollutants or classes of
pollutants (see Table 1 in the text)  regulated by the EPA for
which National Ambient Air Quality Standards JNAAQS)
have been established.

Emission: Release of pollutants into the air (e.g., from a stack
or duct).

Emission factor: A number that shows the relationship  between
an air emission and a measure of production (e.g., pounds of SO2
per 1,000 gallons of input).

Fugitive emissions: Emissions resulting from leaks or from
nonlocalized escape (e.g., from spraying operations).

Hazardous air pollutant (HAP): One of 188 hazardous air
pollutants (see Appendix B) that are regulated.

Inherent limitation: A limitation on emissions that results from
unchanging and unavoidable physical constraints on the operation
of a business.

Major source: A business that has a potential to emit for a
regulated pollutant (or class of pollutants) that is at or greater
than an emission threshold set by the government. The major
source threshold is  100 tons per year of any criteria pollutant if
the business is located in an attainment area.

The major source thresholds for criteria pollutants  for businesses
located in nonattainment areas are listed in Table 6 below.

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                                                                            Appendix I:  Definitions
Table 6. Major Source Thresholds for Criteria Pollutants in Nonattainment Areas3
  Pollutant
  Ozone
 Nonattainment Area Classification
 Marginal
 Moderate
 Serious
 Severe
 Extreme
 Transport regions not classified
 as severe or extreme
Potential Emission Rate
100tpyVOCsorNOxb
100 tpy VOCs or NOX
50 tpy VOCs or NOX
25 tpy VOCs or NOX
10 tpy VOCs or NOX
50 tpy VOCs or 100 tpy NOX
  Carbon monoxide
 Serious
50 tpy CO
  Particulate matter < 10 |im
  (PM-10)
 Serious
70 tpy PM-10
a  Source: The Air Pollution Consultant, Sept./Oct. 1992
b  tpy = tons per year

Major source thresholds for HAPs are listed in Table 7:
Table 7.  Major Source Thresholds for Hazardous Air Pollutants (HAPs)
  Pollutant
  Any single HAP
  Total HAPs
Potential Emission Rate
10 tpya
25 tpy
  tpy = tons per year

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Appendix 4:  Definitions
                                   Material-balance calculation: Calculation of emissions based on
                                   the quantities and types of input materials and the quantities and
                                   types of output materials.

                                   Minor source: A business with a potential to emit that either
                                   fl) lies below major source emission thresholds, or (2) lies
                                   above major source emission thresholds, but through adoption
                                   of emission or process controls or limitations, gains minor
                                   source status.

                                   Nonattainment area: A geographical area that does not meet
                                   National Ambient Air Quality Standards (NAAQS) for criteria
                                   pollutants.

                                   Potential to emit: The maximum capacity of a business to emit a
                                   pollutant given its physical or operational design, and considering
                                   certain controls and limitations.

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          Appendix B
List of Hazardous Air Pollutants (HiPsj

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Appendix  B: HIPs  List
CAS No. Chemical name
75-07-0
60-35-5
75-05-8
98-86-2
53-96-3
107-02-8
79-06-1
79-10-7
107-13-1
107-05-1
92-67-1
62-53-3
90-04-0
0
0
1332-21-4
71-43-2
92-87-5
98-07-7
100-44-7
0
92-52-4
117-81-7
542-88-1
75-25-2
106-99-0
0
156-62-7
133-06-2
63-25-2
Acetaldehyde
Acetamide
Acetonitrile
Acetophenone
2-Acetylaminofluorene
Acrolein
Acrylamide
Acrylic acid
Acrylonitrile
Allyl chloride
Aminobiphenyl
Aniline
o-Anisidine
Antimony Compounds
Arsenic Compounds (inorganic including arsine)
Asbestos
Benzene (including benzene from gasoline)
Benzidine
Benzotrichloride
Benzyl chloride
Beryllium Compounds
Biphenyl
Bis(2-ethylhexyl)phthalate(DEHP)
Bis(chloromethyl)ether
Bromoform
1 ,3-Butadiene
Cadmium compounds
Calcium cyanamide
Captan
Carbaryl
a The Clean Air Act originally specified 189 hazardous air pollutants. In 1996, caprolactam was examined and taken off the list, and thus
  there are now 188 HAPs.

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Appendix B: HiPs List
CAS No. Chemical name
56-23-5
75-15-0
463-58-1
120-80-9
133-90-4
57-74-9
7782-50-5
79-11-8
532-27-4
108-90-7
510-15-6
67-66-3
107-30-2
126-99-8
0
0
0
108-39-4
95-48-7
106-44-5
1319-77-3
98-82-8
0
94-75-7
3547-04-4
334-88-3
132-64-9
96-12-8
84-74-2
106-46-7
91-94-1
111-44-4
542-75-6
Carbon tetrachloride
Carbon disulfide
Carbonyl sulfide
Catechol
Chloramben
Chlordane
Chlorine
Chloroacetic acid
2-Chloroacetophenone
Chlorobenzene
Chlorobenzilate
Chloroform
Chloromethyl methyl ether
Chloroprene
Chromium Compounds
Cobalt Compounds
Coke Oven Emissions
m-Cresol
o-Cresol
p-Cresol
Cresols/Cresylic acid (isomers and mixture)
Cumene
Cyanide Compounds
2,4-D, salts and esters
DDE
Diazomethane
Dibenzofurans
1 ,2-Dibromo-3-chloropropane
Dibutylphthalate
1 ,4-Dichlorobenzene(p)
3,3-Dichlorobenzidene
Dichloroethyl ether (Bis(2-chloroethyl)ether)
1 ,3-Dichloropropene

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Appendix B: HIPs List
CAS No. Chemical name
62-73-7
111-42-2
121-69-7
64-67-5
119-90-4
60-11-7
119-93-7
79-44-7
68-12-2
57-14-7
131113
77781
534-52-1
51-28-5
121-14-2
123-91-1
122-66-7
106-89-8
106-88-7
140-88-5
100-41-4
51-79-6
75-00-3
106-93-4
107-06-2
107-21-1
151-56-4
75-21-8
96-45-7
75-34-3
0
50-00-0
0
Dichlorvos
Diethanolamine
N, N-Diethyl aniline (N, N-Dimethylaniline)
Diethyl sulfate
3,3-Dimethoxybenzidine
Dimethyl aminoazobenzene
3,3%-Dimethyl benzidine
Dimethyl carbamoyl chloride
Dimethyl formamide
1,1-Dimethyl hydrazine
Dimethyl phthalate
Dimethyl sulfate
4,6-Dinitro-o-cresol, and salts
2,4-Dinitrophenol
2,4-Dinitrotoluene
1 ,4-Dioxane (1 ,4-Diethyleneoxide)
1 ,2-Diphenylhydrazine
Epichlorohydrin (l-Chloro-2,3-epoxypropane)
1 ,2-Epoxybutane
Ethyl acrylate
Ethyl benzene
Ethyl carbamate (Urethane)
Ethyl chloride (Chloroethane)
Ethylene dibromide (Dibromoethane)
Ethylene dichloride (1 ,2-Dichloroethane)
Ethylene glycol
Ethylene imine (Aziridine)
Ethylene oxide
Ethylene thiourea
Ethylidene dichloride (1,1-Dichloroethane)
Fine mineral fibers
Formaldehyde
Glycol ethers

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Appendix B: HiPs List
CAS No. Chemical name
76-44-8
118-74-1
87-68-3
77-47-4
67-72-1
822-06-0
680-31-9
110-54-3
302-01-2
7647-01-0
7664-39-3
123-31-9
78-59-1
0
58-89-9
108-31-6
0
0
67-56-1
72-43-5
74-83-9
74-87-3
71-55-6
78-93-3
60-34-4
74-88-4
108-10-1
624-83-9
80-62-6
1634-04-4
101-14-4
75-09-2
101-68-8
Heptachlor
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclopentadiene
Hexachloroethane
Hexamethylene-1 ,6-diisocyanate
Hexamethylphosphoramide
Hexane
Hydrazine
Hydrochloric acid
Hydrogen fluoride (Hydrofluoric acid)
Hydroquinone
Isophorone
Lead Compounds
Lindane (all isomers)
Maleic anhydride
Manganese Compounds
Mercury Compounds
Methanol
Methoxychlor
Methyl bromide (Bromomethane)
Methyl chloride (Chloromethane)
Methyl chloroform (1,1,1-Trichloroethane)
Methyl ethyl ketone (2-Butanone)
Methyl hydrazine
Methyl iodide
Methyl isobutyl ketone (Hexone)
Methyl isocyanate
Methyl methacrylate
Methyl tert butyl ether
4,4-Methylene bis (2-chloroaniline)
Methylene chloride (Dichloromethane)
Methylene diphenyl diisocyanate (MDI)

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Appendix B: HIPs List
CAS No. Chemical name
101-77-9
91-20-3
0
98-95-3
92-93-3
100-02-7
79-46-9
62-75-9
684-93-5
59-89-2
56-38-2
82-68-8
87-86-5
108-95-2
106-50-3
75-44-5
7803-51-2
7723-14-0
85-44-9
1336-36-3
0
1120-71-4
57-57-8
123-38-6
114-26-1
78-87-5
75-56-9
75-55-8
91-22-5
106-51-4
0
0
100-42-5
4,4%-Methylenedianiline
Naphthalene
Nickel Compounds
Nitrobenzene
4-Nitrobiphenyl
4-Nitrophenol
2-Nitropropane
N-Nitrosodimethylamine
N-Nitroso-N-methylurea
N-Nitrosomorpholine
Parathion
Pentachloronitrobenzene (Quintobenzene)
Pentachlorophenol
Phenol
p-Phenylenediamine
Phosgene
Phosphine
Phosphorus
Phthalic anhydride
Polychlorinated biphenyls (Aroclors)
Polycylic Organic Matter
1 ,3-Propane sultone
beta-Propiolactone
Propionaldehyde
Propoxur (Baygon)
Propylene dichloride (1 ,2-Dichloropropane)
Propylene oxide
1 ,2-Propylenimine (2-Methyl aziridine)
Quinoline
Quinone
Radionuclides (including radon)
Selenium Compounds
Styrene

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Appendix B: HiPs List
CAS No. Chemical name
96-09-3
1746-01-6
79-34-5
127-18-4
7550-45-0
95-80-7
584-84-9
108-88-3
95-53-4
8001-35-2
120-82-1
79-00-5
79-01-6
95-95-4
88-06-2
121-44-8
1582-09-8
540-84-1
108-05-4
593-60-2
75-01-4
75-35-4
1330-20-7
108-38-3
95-47-6
106-42-3
Styrene oxide
2,3,7,8-Tetrachlorodibenzo-p-dioxin
1 ,1 ,2,2-Tetrachloroethane
Tetrachloroethylene (Perchloroethylene)
Titanium tetrachloride
2,4-Toluene diamine
2,4-Toluene diisocyanate
Toluene
o-Toluidine
Toxaphene (chlorinated camphene)
1 ,2,4-Trichlorobenzene
1 ,1 ,2-Trichloroethane
Trichloroethylene
2,4,5-Trichlorophenol
2,4,6-Trichlorophenol
Triethylamine
Trifluralin
2,2,4-Trimethylpentane
Vinyl acetate
Vinyl bromide
Vinyl chloride
Vinylidene chloride (1,1-Dichloroethylene)
Xylenes (isomers and mixture)
m-Xylenes
o-Xylenes
p-Xylenes

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Appendix C
  References

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Appendix  C:  References
Appendix C:
References
Some of the EPA policy memoranda listed below and other
guidance on potential to emit can be found on the Internet at
EPA's Technology Transfer Network, Office of Air and Radiation
Policy and Guidance web site at:

http://www.epa.gov/ttn/oarpg

Metal Finishing Suppliers Association (MFSA). Air Emissions.
Chap. 2 in: Metal Finishing Guidance Manual. MFSA.

U.S. Environmental Protection Agency. 1998a. Potential to Emit
(PTE) Guidance for Specific Source Categories. April 14 policy
memorandum from J.S. Seitz, Office of Air Quality Planning and
Standards, and E. Schacffcr, Office of Regulatory Enforcement.

U.S. Environmental Protection Agency. 1998b. Technical Support
Document for Potential to Emit Guidance Memo. Documentation
of Emission Calculations. Tim Smith, Office of Air Quality
Planning and Standards. April.

U.S. Environmental Protection Agency. 1998c. Second Extension
of January 25, 1995 Potential to Emit Transition Policy and
Clarification of Interim Policy. July 10 memorandum from J.S.
Seitz and E.V Schaeffer.

U.S. Environmental Protection Agency. 1996a. Extension of
January 25, 1995 Potential to Emit Transition Policy. August 27
policy memorandum from J.S. Seitz, Office of Air Quality
Planning and Standards, and R.I. Van Heuvelen, Office of
Regulatory Enforcement.

U.S. Environmental Protection Agency. 1996b. Clarification of
Methodology for Calculating Potential to Emit (PTE) for Batch
Chemical Production Operations. August 29 policy memorandum
from J.S. Seitz, Office of Air Quality Planning and Standards.

U.S. Environmental Protection Agency. 1996c. Release of Interim
Policy on Federal Enforceability of Limitations on Potential to
Emit. January 22 policy memorandum from J.S. Seitz, Office
of Air Quality Planning and Standards, and R.I. Van Heuvelen,
Office of Regulatory Enforcement.

U.S. Environmental Protection Agency. 1996d. Letter to
Subcommittee on Permits, New Source Review and
Toxics Integration.

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                                                                     Appendix C: References
U.S. Environmental Protection Agency. 1995a. Options for
Limiting the Potential to Emit (PTE) of a Stationary Source
under Section 112 and Title V of the Clean Air Act (Act).
January 25 policy memorandum from J.S. Seitz, Office of Air
Quality Planning and Standards, and R.I. Van Heuvelen, Office
of Regulatory Enforcement.

U.S. Environmental Protection Agency. 1995b. AP-42, 5th ed.,
Vol. 1. Compilation of Air Pollutant Emission Factors. Office
of Air Quality Planning and Standards. January.

U.S. Environmental Protection Agency. 1995c. Calculating
Potential to Emit (PTE) for Emergency Generators. September 6
policy memorandum from J.S. Seitz, Office of Air Quality
Planning and Standards.

U.S. Environmental Protection Agency. 1995d. Calculating
Potential to Emit (PTE) and Other Guidance for Grain Handling
Facilities. November 14 policy memorandum from J.S. Seitz,
Office of Air Quality Planning and Standards.

U.S. Environmental Protection Agency. 1995e. Protocol for
Equipment Leak Emission Estimates. EPA-453/R-95-017.

U.S. Environmental Protection Agency. 1993a. The Plain
English Guide to the Clean Air Act. Office of Air and Radiation.
EPA400-K-93-001.

U.S. Environmental Protection Agency. 1993b. Approaches
to Creating Federally Enforceable Emissions  Limits.
November 3 policy memorandum from J.S. Seitz, Office
of Air Quality Planning.

U.S. Environmental Protection Agency. 1992. The Clean Air
Act Amendments of 1990: A Guide for Small Businesses. Office
of Air and Radiation. EPA 450-K-92-001.

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                                                                     State  SB4P  Contacts
State  SBAP  contacts:

If you don't know the contact for the state small business assis-
tance program in your state, you can find this information on the
Internet at: http://www.epa.gov/ttn/sbap or contact the Clean Air
Technology Center (CATC) at (919) 541-0800.

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TECHNICAL REPORT DATA
(Please read Instructions on reverse before completing)
1. REPORT NO.
EPA-456/B-98-Q03
2.
4. TITLE AND SUBTITLE
to Emit: A for
7. AUTHORJS)
9. PERFORMING ORGANIZATION NAME AND ADDRESS
U.S. Agency
of Air Planning and
Transfer and Division
Research Triangle Park, NC 27711
12. SPONSORING AGENCY NAME AND ADDRESS
Director
of Air Planning and
of Air and
U.S. Environmental Protection Agency
Triangle Park, NC 27711
3. RECIPIENT'S ACCESSION NO.
5. REPORT DATE
October 1998
6. PERFORMING ORGANIZATION CODE
8. PERFORMING ORGANIZATION REPORT NO.
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1 1 . CONTRACT/GRANT NO.
13. TYPE OF REPORT AND PERIOD COVERED
14. SPONSORING AGENCY CODE
EPA/200/04
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EPA Work M. (919) 541-5437
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This to and of on is
to and how to to for facility. This
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Air Pollution
to
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Air Pollution
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