SACAQMD RULE 412 STAT. I.C. ENG. LOC. AT MJR. STAT.SRC. NOx             
LAST REVISED  06/01/95




             RULE 412  STATIONARY INTERNAL COMBUSTION ENGINES
                LOCATED AT MAJOR STATIONARY SOURCES OF NOX

                             Adopted 06-01-95
                                     
                                   INDEX


100 GENERAL
    101  PURPOSE
    102  APPLICABILITY
    110  EXEMPTION, EMERGENCY STANDBY
    111  EXEMPTION, AGRICULTURAL OPERATIONS
    112  EXEMPTION, TEST STANDS
    113  EXEMPTION, EMISSION CONTROL EVALUATION
    114  EXEMPTION, NONROAD INTERNAL COMBUSTION ENGINE
    115  EXEMPTION, MOTOR VEHICLE ENGINES
    116  EXEMPTION, FLIGHT LINE INTERNAL COMBUSTION ENGINE

200 DEFINITIONS
    201  ACTUAL INTERRUPTIONS OF POWER
    202  ANNUAL HOURS OF OPERATION
    203  BEST AVAILABLE RETROFIT CONTROL TECHNOLOGY (BARCT)
    204  EMERGENCY STANDBY ENGINE
    205  ENGINE RATING
    206  INTERNAL COMBUSTION ENGINE
    207  LEAN-BURN ENGINE
    208  LOCATION
    209  MAJOR STATIONARY SOURCE OF NITROGEN OXIDES
    210  MOTOR VEHICLE ENGINE
    211  MOTOR VEHICLE
    212  NONROAD INTERNAL COMBUSTION ENGINE
    213  POTENTIAL TO EMIT
    214  REASONABLY AVAILABLE CONTROL TECHNOLOGY (RACT)
    215  RETROFITTING
    216  RICH-BURN ENGINE
    217  STATIONARY INTERNAL COMBUSTION ENGINE
    218  STATIONARY SOURCE

300 STANDARDS
    301  RACT EMISSION LIMITS
    302  BARCT EMISSION LIMITS
    303  ALTERNATIVE CONTROL REQUIREMENT
    304  EQUIPMENT REQUIREMENT - HOUR METER

400 ADMINISTRATIVE REQUIREMENTS
    401  COMPLIANCE SCHEDULE
    402  SOURCE TESTING FREQUENCY

500 MONITORING AND RECORDS
    501  RECORDKEEPING REQUIREMENTS
    502  TESTING PROCEDURES
    
    
100 GENERAL
    101  PURPOSE: To limit emissions of nitrogen oxides, carbon
         monoxide, and non-methane hydrocarbons from the operation
         of stationary internal combustion engines located at a
         major stationary source of nitrogen oxides.

    102  APPLICABILITY:  This rule applies to any stationary
         internal combustion engine in the District rated at more
         than 50 brake horsepower located at a major stationary
         source of nitrogen oxides.

    110  EXEMPTION, EMERGENCY STANDBY:  The provisions of Section
         301, Section 302, Section 303 and Section 400 shall not
         apply to the operation of stationary internal combustion
         engines used for emergency standby.

    111  EXEMPTION, AGRICULTURAL OPERATIONS:  The provisions of this
         rule shall not apply to the operation of stationary
         internal combustion engines used directly and exclusively
         for agricultural operations necessary for the growing of
         crops or the raising of fowl or animals.

    112  EXEMPTION, TEST STANDS:  The provisions of this rule shall
         not apply to the operation of stationary internal
         combustion engines mounted on test stands used for
         evaluating engine performance.

    113  EXEMPTION, EMISSION CONTROL EVALUATION:  The provisions of
         Section 301, Section 302, Section 303, and Section 400
         shall not apply to the operation of stationary internal
         combustion engines used exclusively for research, design
         and evaluation of emission control devices.

    114  EXEMPTION, NONROAD INTERNAL COMBUSTION ENGINE:  The
         provisions of this rule shall not apply to nonroad internal
         combustion engines.

    115  EXEMPTION, MOTOR VEHICLE ENGINES:  The provisions of this
         rule shall not apply to motor vehicle engines.

    116  EXEMPTION, FLIGHT LINE INTERNAL COMBUSTION ENGINE:  The
         provisions of this rule shall not apply to internal
         combustion engines used as support for flight line
         operations.

200 DEFINITIONS
    201  ACTUAL INTERRUPTIONS OF POWER: When electrical service is
         interrupted by an unforeseeable event.

    202  ANNUAL HOURS OF OPERATION: The hours a stationary internal
         combustion engine operates in a calendar year. 

    203  BEST AVAILABLE RETROFIT CONTROL TECHNOLOGY (BARCT): Best
         available retrofit control technology as defined in Section
         40406 of the California Health and Safety Code is "an
         emission limitation that is based on the maximum degree of
         reduction achievable, taking into account environmental,
         energy, and economic impacts by each class or category of
         sources."

    204  EMERGENCY STANDBY ENGINE:  Any stationary internal
         combustion engine which does not exceed one hundred (100)
         hours per year of operation for maintenance purposes and
         operates under one or more of the following conditions:
         204.1   The provision of emergency electrical power during
                 actual interruptions of electrical power,  or;
         204.2   The provision of emergency water pumping for flood
                 control, or;
         204.3   The provision of emergency water pumping for fire
                 control, or;
         204.4   The provision of emergency electrical power for
                 emergency incident response by specially trained
                 personnel in law enforcement, medicine or hazardous
                 material incident response.

    205  ENGINE RATING:  The output of a stationary internal
         combustion engine as determined by the engine manufacturer
         and listed on the nameplate of the unit.

    206  INTERNAL COMBUSTION ENGINE:  A heat engine in which the
         combustion that generates the heat takes place inside the
         engine proper instead of in a furnace.

    207  LEAN-BURN ENGINE:  Any internal combustion engine that is
         not a rich-burn engine.

    208  LOCATION: Any single site at a building, structure,
         facility, or installation.

    209  MAJOR STATIONARY SOURCE OF NITROGEN OXIDES:  A stationary
         source whose potential to emit exceeds 25 tons per year of
         nitrogen oxides.

    210  MOTOR VEHICLE ENGINE: Any internal combustion engine used
         to propel a motor vehicle.

    211  MOTOR VEHICLE:  Any device, self propelled by an internal
         combustion engine.

    212  NONROAD INTERNAL COMBUSTION ENGINE:  Any internal
         combustion engine that:
         212.1   is not a motor vehicle engine; and
         212.2   is not regulated by a federal New Source
                 Performance Standard promulgated under section 111
                 of the Federal Clean Air Act; and
         212.3   by itself or in or on a piece of equipment, is
                 portable or transportable, meaning designed to be
                 and capable of being carried or moved from one
                 location to another.  Indicia of transportability
                 include, but are not limited to, wheels, skids,
                 carrying handles, dolly, trailer, or platform; and
         212.4   does not remain at a location for more than 12
                 consecutive months.  Any engine, such as a back-up
                 or stand-by engine, that replaces an engine at a
                 location and is intended to perform the same
                 function as the engine being replaced will be
                 included in calculating the consecutive time
                 period.  In that case, the cumulative time of both
                 engines, including the time between the removal of
                 the original engine and installation of the
                 replacement engine, would be counted toward the
                 consecutive residence time period.  In addition, an
                 engine that is moved from its location but does not
                 need to be moved from its location to perform its
                 function shall be deemed to have remained at a
                 single location. or
         212.5   remains at a location less than 12 consecutive
                 months where such a period represents the full
                 length of normal annual source operations, such as
                 a seasonal source.

    213  POTENTIAL TO EMIT: The maximum physical and operational
         design capacity to emit a pollutant. Limitations on the
         physical or operational design capacity, including
         emissions control devices and limitations on hours of
         operation, may be considered only if such limitations are
         incorporated into the applicable authority to construct and
         permit to operate.  Fugitive emissions associated with the
         emissions unit or stationary source shall not be included
         in the potential to emit of the emissions unit or
         stationary source unless the source belongs to one of the
         following categories of stationary sources:
         213.1      Coal cleaning plants (with thermal dryers);
         213.2      Kraft pulp mills;
         213.3      Portland cement plants;
         213.4      Primary zinc smelters;
         213.5      Iron and steel mills;
         213.6      Primary aluminum ore reduction plants;
         213.7      Primary copper smelters;
         213.8      Municipal incinerators capable of charging more
                    than 250 tons of refuse per day
         213.9      Hydrofluoric, sulfuric, or nitric acid plant;
         213.10  Petroleum refineries;
         213.11  Lime plants;
         213.12  Phosphate rock processing plants;
         213.13  Coke oven batteries;
         213.14  Sulfur recovery plants;
         213.15  Carbon black plants (furnace process);
         213.16  Primary lead smelters;
         213.17  Fuel conversion plants;
         213.18  Sintering plants;
         213.19  Secondary metal production plants;
         213.20  Chemical process plants;
         213.21  Fossil-fuel boilers (or combination thereof)
                 totaling more than 250 million British thermal
                 units per hour heat input;
         213.22  Petroleum storage and transfer units with a total
                 storage capacity exceeding 300,000 barrels;
         213.23  Taconite ore processing plants;
         213.24  Glass fiber processing plants;
         213.25  Charcoal production plants;
         213.26  Fossil-fuel-fired steam electric plants of more
                 than 250 million British thermal units per hour
                 heat input; or
         213.27  All other stationary source categories regulated by
                 a standard promulgated under Section 111 or 112 (42
                 U.S.C. Section 7411 or 7412) of the Federal Clean
                 Air Act, but only with respect to those air
                 pollutants that have been regulated for that
                 category.

    214  REASONABLY AVAILABLE CONTROL TECHNOLOGY (RACT):  The lowest
         emission limitation that a particular unit is capable of
         meeting by using measures that are reasonably available in
         terms of technological and economic feasibility.

    215  RETROFITTING:  Retrofitting is the addition of air
         pollution control equipment to the exhaust stream or
         physical modification to the combustion system excluding
         adjustment  of an stationary internal combustion engine in
         order to meet the RACT standards contained in Section 301. 
         Changes in the method of operation shall not be considered
         as retrofit.

    216  RICH-BURN ENGINE:  A two or four stroke spark-ignited
         internal combustion engine where the manufacturer's
         original recommended operating air/fuel ratio divided by
         the stoichiometric air/fuel ratio is less than or equal to
         1.1.

    217  STATIONARY INTERNAL COMBUSTION ENGINE:  Any internal
         combustion engine that:
         217.1   is not a motor vehicle engine; and 
         217.2   is not a nonroad engine. 

    218  STATIONARY SOURCE:  Any building, structure, facility, or
         emissions unit which emits or may emit any affected
         pollutant directly or as a fugitive emission.
         218.1   Building, structure, facility, or emissions unit
                 includes all pollutant emitting activities which:
            a.   belong to the same industrial grouping, and
            b.   are located on one property or on two or more
                 contiguous properties, and
            c.   are under the same or common ownership,
                 operation, or control or which are owned or
                 operated by entities which are under common
                 control.
         218.2   Pollutant emitting activities shall be considered
                 as part of the same industrial grouping if:
            a.   they belong to the same two-digit standard
                 industrial classification code, or
            b.   they are part of a common production process.
                 (Common production process includes industrial
                 processes, manufacturing processes and any
                 connected processes involving a common material.)

300 STANDARDS
    301  RACT EMISSION LIMITS:  After July 1, 1995, an owner or
         operator of any engine subject to this rule shall not
         operate the engine unless the engine meets the following
         emission limits.  If retrofitting is required, the engine
         is exempt from the limits of this Section provided the
         owner or operator complies with Sections 302 and 401.3




     ENGINE OPERATING           CONDITIONS EMISSIONS LIMIT (ppmv @ 15% O2)



                                NOx       CO         NMHC


Spark Ignited Rich Burn         50        4000        250

Spark Ignited Lean Burn        125        4000        750

Compression Ignited            700        4000        750


    302  BARCT EMISSION LIMITS: 
         302.1   Spark Ignited Rich Burn:
            a.   Except as provided in Table 2 of Section 302.1.b
                 or Section 303 an owner or operator of any spark-
                 ignited rich burn stationary internal combustion
                 engine subject to Section 300 shall not operate
                 the engine unless the engine meets the emission
                 limits in Table 1:



                TABLE 1: SPARK IGNITED RICH BURN 
           EMISSION LIMITS EXPRESSED AS PPMV @ 15% O2


        NOX            CO           NMHC

        25            4,000         250

            b.   If a spark-ignited rich burn stationary internal
                 combustion engine with an engine rating less than
                 or equal to 525 horsepower is operated less than
                 the hours listed in Table 2, the engine shall be
                 exempt from the requirements of Section 302.1.a. 
                 If the hours of operation exceed the hours listed
                 for any unit for any calendar year, then the unit
                 must be operated in compliance with the
                 applicable emissions limits in Section 302.1.a.



                        TABLE 2: SPARK IGNITED RICH BURN 
                     EXEMPTION FROM TABLE 1 EMISSION LIMITS


If engine rating is      ...But less than        and thje actual annual hours
greater than...             or equal to...       of operation are less than
                                                 or equal to ...

        50 hp                  75 hp                  200 hours
        75 hp                  125 hp                 120 hours
       125 hp                  155 hp                 100 hours
       155 hp                  200 hp                 80 hours
       200 hp                  300 hp                 60 hours
       300 hp                  400 hp                 45 hours
       400 hp                  525 hp                 40 hours



         302.2   Spark Ignited Lean Burn: Except as provided in
                 Section 303 an owner or operator of any spark-
                 ignited lean burn stationary internal combustion
                 engine shall not operate the engine unless the
                 engine meets the emission limits in Table 3:




                        TABLE 3: SPARK IGNITED LEAN BURN
                EMISSION LIMITS EXPRESSED AS PPMV @ 15% O2

        NOX               CO              NMHC
       65                4,000           750



         302.3   Compression Ignited Engine:
            a.   Except as provided in Table 5 of Section 302.3.b
                 or Section 303 an owner or operator of any
                 compression ignited stationary internal
                 combustion engine shall not operate the engine
                 unless the engine meets the emission limits in
                 Table 4:




                        TABLE 4: COMPRESSION IGNITED
                EMISSION LIMITS EXPRESSED AS PPMV @ 15% O2

         NOX             CO            NMHC
         80            4,000           750

            
            b.   If a compression ignited stationary internal
                 combustion engine with an engine rating less than
                 or equal to 525 horsepower is operated less than
                 the hours listed in Table 5, the engine shall be
                 exempt from the requirements of Section 302.3.a. 
                 If the hours of operation exceed the hours listed
                 for any unit for any calendar year, then the unit
                 must be operated in compliance with the
                 applicable emissions limits in Section 302.3.a.




                        TABLE 5: COMPRESSION IGNITED
                 EXEMPTION FROM TABLE 4 EMISSION LIMITS


If engine rating         ...but less than       and the actual hours of
is greater than...        or equal to...        operation are less than or 
                                                equal to...
  50 hp                       75 hp                  1,435 hours
  75 hp                      125 hp                    830 hours
 125 hp                      155 hp                    565 hours
 155 hp                      200 hp                    460 hours
 200 hp                      300 hp                    365 hours
 300 hp                      400 hp                    250 hours
 400 hp                      525 hp                    200 hours
 

    303  ALTERNATIVE CONTROL REQUIREMENT: As an alternative to the
         NOX emission limit specified in Section 302 a stationary
         internal combustion engine shall achieve and maintain a
         percent NOX reduction by volume limit specified below as
         measured concurrently across an emission control device. 
         If internal modifications are made to an engine the percent
         reduction shall be calculated from source test data before
         and after internal modification.
         303.1   Spark ignited rich burn  90 percent
         303.2   Spark ignited lean burn  90 percent
         303.3   Compression ignited  90 percent


    304  EQUIPMENT REQUIREMENT:  The owner or operator of any
         stationary internal combustion engine, except for those
         engines being removed from service under Section 401.5,
         subject to any provision of this rule shall install one of
         the following:
         304.1   HOUR METER:  A non-resetting totalizing hour meter
                 on each engine by (12 months after date of
                 adoption).
         304.2   COMPUTERIZED TRACKING:  A computerized tracking
                 system that maintains a continuous daily record of
                 hours of operation.


400 ADMINISTRATIVE REQUIREMENTS
    401  COMPLIANCE SCHEDULE:
         401.1   RACT EMISSION LIMITS: Any non-exempt stationary
                 internal combustion engine that is subject to the
                 rule and has operated in the District prior to
                 (date of adoption) shall comply with the applicable
                 limits by July 1, 1995 unless retrofitting is
                 required.  If retrofitting is required the engine
                 shall comply with Section 401.3 and either Section
                 401.4 or Section 401.5.
         401.2   BARCT EMISSION LIMITS: Any non-exempt stationary
                 internal combustion engine that is subject to the
                 emission limits of Section 302 shall comply with
                 the applicable limits by May 31, 1997 in accordance
                 with Section 401.3 and either Section 401.4 or
                 Section 401.5
         401.3   CURRENT EMISSION LEVEL: The owner or operator of
                 any non-exempt stationary internal combustion
                 engine subject to Section 401.1 or Section 401.2
                 must comply with the following requirements by July
                 1, 1995:
            a.   Submit a current emission level for each engine
                 to the Air Pollution Control Officer.
            b.   A description of the method used to determine the
                 current emission level.
         401.4   INCREMENTS OF PROGRESS: The owner or operator of
                 any stationary internal combustion engine subject
                 to Section 302 must comply with the following
                 requirements:
            a.   By July 1, 1995 submit a compliance plan to the
                 Air Pollution Control Officer for each unit which
                 includes the following information:
              1. The retrofitting required to meet the limits
                 of Section 302 or Section 303.
              2. A schedule demonstrating compliance with the
                 emission limits of Section 302 or Section 303
                 and the remaining increments of this Section
            b.   By January 31, 1996 submit a complete application
                 for an Authority to Construct for the
                 modifications or equipment necessary to meet the
                 applicable emission limits contained in Section
                 302 or Section 303 to the Air Pollution Control
                 Officer.
            b.   By November 30, 1996 begin construction.
            c.   By March 31, 1997 complete construction.
            d.   By May 31, 1997 comply with the emission limits
                 of Section 302 or Section 303.  This shall
                 include the submittal of a complete source test
                 report indicating compliance.
         401.5   REMOVAL FROM SERVICE: The owner or operator of any
                 stationary internal combustion engine operated in
                 the District prior to (date of adoption) that is
                 expected to be removed from service by May 31, 1999
                 shall comply with the following:
            a.   By July 1, 1995, submit to the Air Pollution
                 Control Officer a petition (a petition form can
                 be obtained from the District) requesting an
                 exemption from the requirements of Section 301
                 through 303.
            b.   By January 31, 1996, submit to the Air Pollution
                 Control Officer a compliance plan containing  the
                 following information:
              1. A complete application for an Authority to
                 Construct for modification of the Permit to
                 Operate.
            c.   By May 31, 1999, discontinue operation of the
                 stationary internal combustion engine unit,
                 disconnect fuel supply line(s), and notify the
                 Air Pollution Control Officer, in writing, of the
                 removal from service.

    402  SOURCE TESTING FREQUENCY:  The owner or operator of any
         stationary internal combustion engine subject to the
         requirements of Sections 301 through 303 shall conduct
         source testing every eight thousand seven hundred sixty
         (8,760) hours of operation or five (5) years which ever is
         the shorter time period.


500 MONITORING AND RECORDS
    501  RECORDKEEPING REQUIREMENTS:
         501.1   The owner or operator of any stationary internal
                 combustion engine subject to any provision of this
                 rule shall maintain an operation record containing,
                 at a minimum, the following data:
            a.   Permit number of each stationary internal
                 combustion engine.
            b.   Manufacturer, model number and rating in
                 horsepower of each stationary internal combustion
                 engine.
            c.   Actual quarterly hours of operation of each
                 stationary internal combustion engine.
            d.   Maintain copies of most recent emission tests
                 including date and results reported as ppmv @ 15%
                 O2 of NOX and pounds per unit time of NOX.
         501.2   The owner or operator of any stationary internal
                 combustion engine subject to any provision of this
                 rule shall maintain the operation record for a
                 period of five (5) years.  The records shall be
                 available for inspection by the Air Pollution
                 Control Officer upon request.

    502  TESTING PROCEDURES: Demonstration of compliance with the
         emission limits specified in Sections 301 through 303 shall
         be determined using the test methods specified below
         averaged over three consecutive test runs.
         502.1   OXIDES OF NITROGEN:
            a.   Emissions of oxides of nitrogen from spark
                 ignited engines shall be determined  using ARB
                 Test Method 100.
            b.   Emissions of oxides of nitrogen from compression
                 ignited engines shall be determined using EPA
                 Test Method 7E.
         502.2   CARBON MONOXIDE:
            a.   Emissions of carbon monoxide from spark ignited
                 engines shall be determined using ARB Test Method
                 100.
            b.   Emissions of carbon monoxide from compression
                 ignited engines shall be determined using EPA
                 Test Method 10.
         502.3   OXYGEN CONTENT:
            a.   Oxygen content of exhaust from spark ignited
                 engines shall be determined using ARB Test Method
                 100..
            b.   Oxygen content of exhaust from compression
                 ignited engines shall be determined using EPA
                 Test Method 3A.
         502.4   NONMETHANE HYDROCARBONS:
            a.   Nonmethane hydrocarbon emissions shall be
                 determined using EPA Test Method 25 or 25A.  If
                 EPA Test Method 25A is used, EPA Test Method 18
                 shall be used to determine methane content.