SCAQMD RULE 2012-1 OVERVIEW
LAST REVISED 11/11/11

C H A P T E R 1



O V E R V I E W

This document provides the technical specifications for normally operated RECLAIM sources subject to District Rule 2012 "Requirements for Monitoring, Reporting, and Recordkeeping for Oxides of Nitrogen (NOx) Emissions." District Rule 2012 divides sources into four categories - major sources, large sources, NOx process units and equipment designated in Rule 219 - Equipment Not Requiring A Written Permit Pursuant To Regulation II. One difference in requirements between these source categories is the monitoring approach. A major source shall be monitored by a continuous emissions monitoring system (CEMS) or alternative monitoring system; a large source has the option to be monitored by a continuous process monitoring system (CPMS); and a NOx process unit has the option to be monitored manually by a fuel meter and/or timer, and any other device specified by the Executive Officer, in accordance with approval criteria stated in Rule 2012.

Another distinction between major and large sources and process units is the way in which they transmit data to the District's Central Station and the reporting frequency. Major sources shall electronically transmit the data via an RTU on a daily basis. In addition, the aggregated NOx emissions from all major sources shall be submitted in a Monthly Emissions Report. Large sources and process units have the option to report data via the RTU or other acceptable approaches such as a modem. Large sources report monthly; NOx process units shall submit emission data as part of the Quarterly Certification of Emissions required by Rule 2004 - Requirements.

The criteria for determining the applicable NOx RECLAIM category is presented in Table 1-A for a major source, Table 1-B for a large source, and Table 1-C for a NOx process unit. A fourth class of NOx sources are those that are exempt from permits per Rule 219. For both NOx process units and equipment exempt under Rule 219, the Facility Permit holder shall report the NOx emissions in the Quarterly Certification of Emissions . Election conditions for large sources and process units based on a NOx emission factor, concentration limit or emission rate would be part of an amendment to the Facility Permit. Election conditions for process units based on category-specific emission rate shall also require an amendment to the Facility Permit.

The Facility Permit will limit mass emissions in accordance with the following:

ð ECEMS + ð ECL + ð E ER + ð EEF + ð E219 µ RTCs

where:

ð ECEMS = sum of facility emissions monitored by CEMS or alternative monitoring system

ð ECL = sum of facility emissions from large sources subject to concentration limits

ð EER = sum of facility emissions from large sources and process units subject to emission rates

ð EEF = sum of facility emissions from large sources* and process units subject to emission factors

ð E219 = sum of facility emissions from equipment exempt under Rule 219

RTC = RECLAIM Trading Credit held by the Facility Permit holder

The fuel usage for any large source, process unit, or equipment exempt under Rule 219 shall not exceed the value determined in accordance with the following relationship:

ð (FxEF)pu,l + ð (FxER)pu,l + ð (FxEF)219 < RTC - ð ECEMS - ð ECL

where:

F = Fuel usage for the large source, process unit, or equipment exempt under Rule 219

The Facility Permit holder shall document the duration of operating time of any rental equipment at the Facility. Emissions generated by any rental equipment which exceeds 72 hours of operation in a quarter shall be determined and reported by the Facility Permit holder according to the applicable methodology for major or large sources or process units or Rule 219 exempt equipment.

This document has been divided into chapters addressing the various compliance aspects of Rule 2012. A summary of these chapters follows:

CHAPTERS 2 AND 3: MAJOR (CEMS) AND LARGE (CPMS) SOURCES

Chapters 2 and 3 describe the methodologies for measuring and reporting emissions from major and large sources, respectively. If a major source category is applicable then the Facility Permit holder shall be required to comply with the performance standards associated with a CEMS or an approved alternative monitoring system.

For large sources, the Facility Permit holder shall use a CEMS or elect to use a CPMS to measure NOx emissions. With a CPMS, the focal point for determining NOx emissions in this source category shall be the emission factor, concentration limit, or equipment-specific emission rate. In its most simplistic form, mass emissions shall be estimated by using the emission factor* (e.g., lb/mmscf), emission rate (e.g., lb/mmBtu), or concentration limit (e.g., ppmv converted to lb/mmBtu) and a throughput rate (typically fuel consumption adjusted for heating value).

Unless specifically exempted by Rule 2012, the Facility Permit holder for a major source shall measure and record all applicable measured variables as specified in Table 2-A. The Facility Permit holder for a large source shall measure and record one or more measured variables as specified in Table 3-A.

For large sources, process units and Rule 219 equipment, measurement and reporting requirements apply to variables used to calculate the NOx emissions. The Facility Permit will specify either a concentration limit or an emission rate for a large source, in accordance with Rule 2012. One or more measured variables necessary to substantiate the equipment specific emission rate shall be monitored for large sources. Fuel usage or throughput is required to be measured for large sources subject to a concentration limit.

* On and after January 1, 1995 (Cycle 1 facilities) and July 1, 1995 (Cycle 2 facilities), large-source emissions shall not be based on emission factors.

Several important aspects of Chapters 2 and 3 include:

° equations describing the methods used to calculate NOx emissions

° operational requirements

° obtaining valid data points

° alternative data acquisition methods

° accuracy requirements

° quality assurance procedures

° missing data procedures

° final and interim reporting procedures, and

° time-sharing

The concentration limit for large sources plays an important role in assessing the equipment's compliance status. If a large source exceeds the applicable concentration limit then the equipment shall be in violation of District Rules. The methodology for determining the applicable concentration limit is covered in Chapters 3 and 5.

The protocol allows for election to a different monitoring classification by fuel usage. Dedicated fuel meters for major and large sources shall be required for fuel usage verification. The emission rate for large sources shall comply with source testing requirements specified in Chapter 6. Once approved by the Executive Officer, an emission rate serves as an "average" value representing the source's annual NOx emissions.

CHAPTER 4: PROCESS UNITS- PERIODIC REPORTING AND RULE 219 EQUIPMENT

Chapter 4 describes the measuring and reporting requirements for the NOx process unit category. NOx process units, which comprise one or more pieces of equipment in accordance with Rule 2012, shall base emission calculations primarily on fuel consumption or operating time in conjuction with an emission factor or emission rate.

Important aspects of Chapter 4 include equations describing the method used to calculate NOx emissions and reporting procedures, as well as determining NOx emissions from equipment exempt under Rule 219.

CHAPTER 5 - ALL SOURCES AND UNITS - SOURCE TESTING

Large sources shall require source testing to establish emission rates and concentration limits, and verify compliance with the concentration limit. Process units shall require source testing only to establish alternative emission rates. Chapter 5 presents a brief description of the required test methods and the required source testing and tune-up frequency for affected equipment.

CHAPTER 6 - ALL SOURCES AND UNITS - DETERMINING SOURCE CATEGORY STATUS

As shown in Tables 1-A, 1-B, and 1-C all NOx RECLAIM equipment are categorized by equipment rating, mass emissions and annual operating capacity. On that basis, Chapter 6 prescribes the methodology for assessing these criteria so that the RECLAIM Facility Permit holder can adequately categorize each piece of equipment.

CHAPTER 7 - REMOTE TERMINAL UNITS (RTU) - ELECTRONIC REPORTING

Once the variables for determining emissions and tracking equipment operations have been measured, the measured data shall be stored at the facility. In addition, selected measured and calculated data shall be transmitted to the District's Central Station. This storing and transmitting of data shall be performed by the remote terminal unit (RTU) for a major source.

The use of a RTU for reporting purposes is optional for large sources, process units, and Rule 219 equipment.

Chapter 7 specifies tasks and characteristics required of the RTU as well as a guide for providing the required software/hardware for the RTU. In addition, this chapter serves as a:

° a functional guideline for operating requirements of the RTU, and

° an information source concerning RTU hardware/software procurement, configuration, installation, maintenance, and compatibility with the monitoring equipment and the District's Central Station.

TABLE 1-A

Criteria for Determining Major NOx Source Category

o Any boiler, furnace, oven, dryer, heater, incinerator, test cell and any solid, liquid or gaseous fueled equipment with maximum rated capacity greater than or equal to 40 but less than 500 million Btu per hour and an annual heat input greater than 90 billion Btu per year; or 500 million Btu per hour or more irrespective of heat input;

o Any internal combustion engine with rated brake horsepower (bhp) greater than or equal to 1,000 bhp and operating more than 2,190 hours per year;

o Any gas turbine rated greater than or equal to 2.9 megawatts excluding emergency standby equipment or peaking unit;

o Any petroleum refinery fluid catalytic cracking unit;

o Any petroleum refinery tail gas unit;

o Any kiln or calciner with a rated process weight greater than or equal to 10 tons per hour and processing more than 21,900 tons per year;

o Any equipment burning or incinerating solid fuels or materials;

o Any existing equipment using NOx CEMS or required to install CEMS under District rules to be implemented as of [date of adoption];

o Any NOx source or process unit elected by the Facility Permit holder or required of the Executive Officer to be monitored with a CEMS;

o Any NOx source or process unit for which NOx emissions reported pursuant to Rule 301 were equal to or greater than 10 tons per yr for any calendar year from 1987 to 1991, inclusive, excluding NOx sources or process units listed under Rule 2012 subparagraphs (d)(1)(A) through (d)(1)(E), and (e)(1)(A) through (e)(1)(D) and excluding any NOx source or process unit which has reduced NOx emissions to below 10 tons per year prior to January 1, 1994.

TABLE 1-B

Criteria for Determining Large NOx Source Category

o Any boiler, furnace, oven, dryer, heater, incinerator, test cell and any liquid or gaseous fueled equipment with a maximum rated capacity greater than or equal to 40 but less than 500 million Btu per hour and an annual heat input of 90 billion Btu per year or less, or greater than or equal to 10 but less than 40 million Btu per hour and an annual heat input greater than 23 billion Btu per year;

o Any internal combustion engine with rated brake horsepower greater than or equal to 1,000 bhp and operating 20002190 hours per year or less, or greater than or equal to 200 bhp but less than 1000 bhp and operating more than 2,190 hours per year;

o Any gas turbine rated greater than or equal to 0.2 but less than 2.9 megawatts, excluding any emergency standby equipment or peaking unit;

o Any kiln or calciner with rated process weight less than 10 tons per hour;

o Any sulfuric acid production unit;

o Any Facility Permit holder-selected NOx process unit or equipment required by the Executive Officer to be monitored with a CPMS;

o Any NOx source with reported emissions pursuant to Rule 301 equal to or greater than 4 tons per year, but less than 10 tons per year for any calendar year from 1987 to 1991, inclusive, excluding NOx sources or process units listed under Rule 2012 subparagraphs (c)(1)(A) through (c)(1)(H), and (e)(1)(A) through (e)(1)(D).

TABLE 1-C

Criteria for Determining NOx Process Unit Category

o Any boiler, furnace, oven, dryer, heater, incinerator, test cell and any liquid or gaseous fueled equipment with maximum rated capacity greater than or equal to 10 but less than 40 million Btu per hour and an annual heat input of 23 bilion Btu per year or less; or greater than or equal to 2 but less than 10 million Btu per hour;

o Any internal combustion engine with rated brake horsepower greater than or equal to 200 bhp but less than 1000bhp and operating 2,190 hours per year or less; or greater than 50 but less than 200 bhp;

o Any portable combustion and process equipment which is not a major or large source;

o Any emergency standby equipment or peaking unit;

o Any other NOx source that is not a large or major NOx source, or exempt pursuant to Rule 219 - "Equipment Not Requiring a Written Permit Pursuant to Regulation II".

SCAQMD RULE 2012-1 OVERVIEW
LAST REVISED 11/11/11





         C H A P T E R   1



         O V E R V I E W


PROTOCOL FOR RULE 2012


             This document provides the technical specifications for
             normally operated RECLAIM sources subject to District Rule
             2012 "Requirements for Monitoring, Reporting, and
             Recordkeeping for Oxides of Nitrogen (NOx) Emissions."
             District Rule 2012 divides sources into four categories -
             major sources, large sources, NOx process units and
             equipment designated in Rule 219 - Equipment Not Requiring A
             Written Permit Pursuant To Regulation II.    One difference
             in requirements between these source categories is the
             monitoring approach.  A major source shall be monitored by a
             continuous emissions monitoring system (CEMS) or alternative
             monitoring system; a large source has the option to be
             monitored by a continuous process monitoring system (CPMS);
             and a NOx process unit has the option to be monitored
             manually by a fuel meter and/or timer, and any other device
             specified by the Executive Officer, in accordance with
             approval criteria stated in Rule 2012.
             Another distinction between major and large sources and
             process units is the way in which they transmit data to the
             District's Central Station and the reporting frequency.
             Major sources shall electronically transmit the data via an
             RTU on a daily basis.  In addition, the aggregated NOx
             emissions from all major sources shall be submitted in a
             Monthly Emissions Report. Large sources and process units
             have the option to report data via the RTU or other
             acceptable approaches such as a modem.  Large sources report
             monthly; NOx process units shall submit emission data as
             part of the Quarterly Certification  of Emissions required
             by Rule 2004 - Requirements.
             The criteria for determining the applicable NOx RECLAIM
             category is presented in Table 1-A for a major source, Table
             1-B for a large source, and Table 1-C for a NOx process
             unit.  A fourth class of NOx sources are those that are
             exempt from permits per Rule 219.  For both NOx process
             units and equipment exempt under Rule 219, the Facility
             Permit holder shall report the NOx emissions in the
             Quarterly Certification of Emissions .  Election conditions
             for large sources and process units based on a NOx emission
             factor, concentration limit or emission rate would be part
             of an amendment to the Facility Permit.  Election conditions
             for process units based on  category-specific emission rate
             shall also require an amendment to the Facility Permit.
             The Facility Permit will limit mass emissions in accordance
             with the following:
                  ä ECEMS  +  ä ECL + ä E ER +  ä EEF  + ä  E219  ó  RTCs

                  where:

                       ä ECEMS=  sum  of  facility emissions monitored by
                                      CEMS   or   alternative  monitoring
                                      system

                       ä ECL     =    sum of facility emissions from
                                      large sources subject to
                                      concentration limits

                       ä EER     =    sum  of  facility   emissions  from
                                      large  sources  and  process  units
                                      subject to emission rates

                                                                    ä EEF
                                      =sum of facility emissions from
                                      large sources* and process units
                                      subject to emission factors

                       ä E219    =    sum  of  facility  emissions   from
                                      equipment exempt under Rule 219

                       RTC       =    RECLAIM  Trading Credit held by the
                                      Facility Permit holder

             The fuel usage for any large source, process unit, or
             equipment exempt under Rule 219 shall not exceed the value
             determined in accordance with the following relationship:
                  ä (FxEF)pu,l+ä(FxER)pu,l+ä(FxEF)219 < RTC-äECEMS - ä ECL

                       where:

                       F    =    Fuel usage for the large source, process
                                      unit,  or  equipment  exempt  under
                                      Rule 219


             The Facility Permit holder shall document the duration of
             operating time of any rental equipment at the Facility.
             Emissions generated by any rental equipment which exceeds 72
             hours of operation in a quarter shall be determined and
             reported by the Facility Permit holder according to the
             applicable methodology for major or large sources or process
             units or Rule 219 exempt equipment.
             This document has been divided into chapters addressing the
             various compliance aspects of Rule 2012.  A summary of these
             chapters follows:
                  CHAPTERS 2 AND 3:  MAJOR (CEMS) AND LARGE (CPMS)
             SOURCES
             Chapters 2 and 3 describe the methodologies for measuring
             and reporting emissions from major and large sources,
             respectively.  If a major source category is applicable then
             the Facility Permit holder shall be required to comply with
             the performance standards associated with a CEMS or an
             approved alternative monitoring system.
             For large sources, the Facility Permit holder shall use a
             CEMS or elect to use a CPMS to measure NOx emissions.  With
             a CPMS, the focal point for determining NOx emissions in
             this source category shall be the emission factor,
             concentration limit, or equipment-specific emission rate.
             In its most simplistic form, mass emissions shall be
             estimated by using the emission factor* (e.g., lb/mmscf),
             emission rate (e.g., lb/mmBtu), or concentration limit
             (e.g., ppmv converted to lb/mmBtu) and a throughput rate
             (typically fuel consumption adjusted for heating value).
             Unless specifically exempted by Rule 2012, the Facility
             Permit holder for a major source shall measure and record
             all applicable measured variables as specified in Table 2-A.
             The Facility Permit holder for a large source shall measure
             and record one or more measured variables as specified in
             Table 3-A.
             For large sources, process units and Rule 219 equipment,
             measurement and reporting requirements apply to variables
             used to calculate the NOx emissions.  The Facility Permit
             will specify either a concentration limit or an emission
             rate for a large source, in accordance with Rule 2012.  One
             or more measured variables necessary to substantiate the
             equipment specific emission rate shall be monitored for
             large sources.  Fuel usage or throughput is required to be
             measured for large sources subject to a concentration limit.
                       *   On   and   after  January  1,  1995  (Cycle  1
                       facilities) and July 1, 1995 (Cycle 2 facilities),
                       large-source  emissions  shall  not  be  based  on
                       emission factors.

                  Several important aspects of Chapters 2 and 3 include:

                       ø    equations  describing  the  methods  used  to
                            calculate NOx emissions
                       ø    operational requirements
                       ø    obtaining valid data points
                       ø    alternative data acquisition methods
                       ø    accuracy requirements
                       ø    quality assurance procedures
                       ø    missing data procedures
                       ø    final and interim reporting procedures, and
                       ø    time-sharing

                  The  concentration  limit  for  large  sources plays an
                  important role in assessing the equipment's  compliance
                  status.   If  a  large  source  exceeds  the applicable
                  concentration  limit  then  the equipment shall  be  in
                  violation  of  District  Rules.   The  methodology  for
                  determining  the  applicable   concentration  limit  is
                  covered in Chapters 3 and 5.

                  The  protocol  allows  for  election   to  a  different
                  monitoring  classification  by  fuel usage.   Dedicated
                  fuel  meters  for  major  and  large sources  shall  be
                  required  for  fuel usage verification.   The  emission
                  rate for large sources shall comply with source testing
                  requirements specified  in Chapter 6.  Once approved by
                  the Executive Officer, an  emission  rate  serves as an
                  "average"  value  representing the source's annual  NOx
                  emissions.

                  CHAPTER 4:  PROCESS UNITS- PERIODIC REPORTING AND RULE
             219 EQUIPMENT
             Chapter 4 describes the measuring and reporting requirements
             for the NOx process unit category.  NOx process units, which
             comprise  one or more pieces of equipment in accordance with
             Rule 2012, shall base emission calculations primarily on
             fuel consumption or operating time in conjuction with an
             emission factor or emission rate.
             Important aspects of Chapter 4 include equations describing
             the method used to calculate NOx emissions and reporting
             procedures, as well as determining NOx emissions from
             equipment exempt under Rule 219.
                  CHAPTER 5 - ALL SOURCES AND UNITS - SOURCE TESTING
             Large sources shall require source testing to establish
             emission rates and concentration limits, and verify
             compliance with the concentration limit.  Process units
             shall require source testing only to establish alternative
             emission rates.  Chapter 5 presents a brief description of
             the required test methods and the required source testing
             and tune-up frequency for affected equipment.

                  CHAPTER 6 - ALL SOURCES AND UNITS - DETERMINING SOURCE
                  CATEGORY STATUS

             As shown in Tables 1-A, 1-B, and 1-C all NOx RECLAIM
             equipment are categorized by equipment rating, mass
             emissions and annual operating capacity.  On that basis,
             Chapter 6 prescribes the methodology for assessing these
             criteria so that the RECLAIM Facility Permit holder can
             adequately categorize each piece of equipment.

                  CHAPTER 7 - REMOTE TERMINAL UNITS (RTU) - ELECTRONIC
                  REPORTING

             Once the variables for determining emissions and tracking
             equipment operations have been measured, the measured data
             shall be stored at the facility.  In addition, selected
             measured and calculated data shall be transmitted to the
             District's Central Station.  This storing and transmitting
             of data shall be performed by the remote terminal unit (RTU)
             for a major source.
             The use of a RTU for reporting purposes is optional for
             large sources, process units, and Rule 219 equipment.
             Chapter 7 specifies tasks and characteristics required of
             the RTU as well as a guide for providing the required
             software/hardware for the RTU.  In addition, this chapter
             serves as a:
                       ø    a   functional    guideline   for   operating
                            requirements of the RTU, and

                       ø    an   information   source    concerning   RTU
                            hardware/software procurement, configuration,
                            installation, maintenance, and  compatibility
                            with   the   monitoring  equipment  and   the
                            District's Central Station.





             TABLE 1-A

                  Criteria for Determining Major NOx Source Category

                       o    Any  boiler, furnace,  oven,  dryer,  heater,
                          incinerator, test cell and any solid, liquid or
                          gaseous  fueled  equipment  with  maximum rated
                          capacity greater than or equal to 40  but  less
                          than  500  million  Btu  per hour and an annual
                          heat  input  greater than 90  billion  Btu  per
                          year;  or 500 million  Btu  per  hour  or  more
                          irrespective of heat input;

                       o    Any internal  combustion  engine  with  rated
                          brake horsepower (bhp) greater than or equal to
                          1,000  bhp  and operating more than 2,190 hours
                          per year;

                       o    Any gas turbine  rated  greater than or equal
                          to  2.9 megawatts excluding  emergency  standby
                          equipment or peaking unit;

                       o    Any   petroleum   refinery   fluid  catalytic
                          cracking unit;

                       o    Any petroleum refinery tail gas unit;
                       o    Any  kiln  or  calciner with a rated  process
                            weight greater than  or  equal to 10 tons per
                            hour and processing more than 21,900 tons per
                            year;

                       o    Any  equipment burning or incinerating  solid
                            fuels or materials;

                       o    Any existing  equipment  using  NOx  CEMS  or
                            required to install CEMS under District rules
                            to be implemented as of [date of adoption];

                       o    Any NOx source or process unit elected by the
                            Facility  Permit  holder  or  required of the
                            Executive  Officer  to  be monitored  with  a
                            CEMS;

                       o    Any NOx source or process  unit for which NOx
                            emissions reported pursuant  to Rule 301 were
                            equal to or greater than 10 tons  per  yr for
                            any   calendar   year   from  1987  to  1991,
                            inclusive, excluding NOx  sources  or process
                            units  listed  under  Rule 2012 subparagraphs
                            (d)(1)(A)  through (d)(1)(E),  and  (e)(1)(A)
                            through  (e)(1)(D)   and  excluding  any  NOx
                            source or process unit  which has reduced NOx
                            emissions to below 10 tons  per year prior to
                            January 1, 1994.




             TABLE 1-B

                  Criteria for Determining Large NOx Source Category

                       o    Any  boiler,  furnace,  oven, dryer,  heater,
                          incinerator,  test  cell  and   any  liquid  or
                          gaseous  fueled equipment with a maximum  rated
                          capacity greater  than  or equal to 40 but less
                          than 500 million Btu per  hour  and  an  annual
                          heat  input of 90 billion Btu per year or less,
                          or greater than or equal to 10 but less than 40
                          million  Btu  per hour and an annual heat input
                          greater than 23 billion Btu per year;

                       o    Any internal  combustion  engine  with  rated
                          brake horsepower greater than or equal to 1,000
                          bhp  and  operating  20002190 hours per year or
                          less, or greater than  or  equal to 200 bhp but
                          less  than  1000  bhp and operating  more  than
                          2,190 hours per year;

                       o    Any gas turbine rated  greater  than or equal
                          to  0.2 but less than 2.9 megawatts,  excluding
                          any  emergency  standby  equipment  or  peaking
                          unit;

                       o    Any  kiln  or  calciner  with  rated  process
                          weight less than 10 tons per hour;

                       o    Any sulfuric acid production unit;
                       o    Any   Facility   Permit  holder-selected  NOx
                            process  unit or equipment  required  by  the
                            Executive  Officer  to  be  monitored  with a
                            CPMS;

                       o    Any   NOx   source  with  reported  emissions
                            pursuant to Rule 301 equal to or greater than
                            4 tons per year,  but  less  than 10 tons per
                            year for any calendar year from 1987 to 1991,
                            inclusive, excluding NOx sources  or  process
                            units  listed  under  Rule 2012 subparagraphs
                            (c)(1)(A)  through (c)(1)(H),  and  (e)(1)(A)
                            through (e)(1)(D).




             TABLE 1-C

                  Criteria for Determining NOx Process Unit Category

                       o    Any boiler,  furnace,  oven,  dryer,  heater,
                          incinerator,   test  cell  and  any  liquid  or
                          gaseous  fueled equipment  with  maximum  rated
                          capacity greater  than  or equal to 10 but less
                          than 40 million Btu per hour and an annual heat
                          input of 23 bilion Btu per  year  or  less;  or
                          greater  than  or  equal  to 2 but less than 10
                          million Btu per hour;

                       o    Any  internal  combustion engine  with  rated
                          brake horsepower greater  than  or equal to 200
                          bhp  but less than 1000bhp and operating  2,190
                          hours  per year or less; or greater than 50 but
                          less than 200 bhp;

                       o    Any portable combustion and process equipment
                          which is not a major or large source;

                       o    Any emergency  standby  equipment  or peaking
                          unit;

                       o    Any  other NOx source that is not a large  or
                          major NOx  source,  or  exempt pursuant to Rule
                          219 - "Equipment Not Requiring a Written Permit
                          Pursuant to Regulation II".