MBUAPCD RULE 404 SULFUR COMPOUNDS AND NITROGEN OXIDES          
LAST REVISED 09/15/93
          
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          RULE 404.   SULFUR COMPOUNDS AND NITROGEN OXIDES
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          [Adopted 9-1-74; Revised 9-15-93]



                                      CONTENTS


          PART 1  GENERAL..............................................1
            
            1.1   Purpose..............................................1
              
            1.2   Applicability........................................1
              
            1.3   Exemptions...........................................2
              
            1.4   Effective Dates......................................2
              
            1.5   References...........................................2
              

          PART 2  DEFINITIONS..........................................2
            
            2.1   British Thermal Unit (Btu)...........................2
                  
            2.2   Nitrogen Oxides......................................2
              

          PART 3  REQUIREMENTS AND STANDARDS...........................2
            
            3.1   Emission Limits......................................3
              
            3.2   Measurement Methods..................................3
              
            3.3   Recordkeeping Requirements...........................3
                  




          PART 1  GENERAL


          1.1   Purpose

            The purpose of this Rule is to provide limits for the emissions
            of sulfur compounds, nitrogen oxides and nitrogen dioxide from
            sources within the District.


          1.2   Applicability

            The provisions of this Rule shall apply to sources of sulfur
            compounds, nitrogen oxides, nitrogen dioxide subject to
            District Rule 200.


          1.3   Exemptions

            1.3.1   Utility power boilers subject to District Rule 431
                    shall not be subject to Subsection  of this Rule.


          1.4   Effective Dates

            This Rule has been in effect since September 1, 1974.  The Rule
            in its present form is effective on September 15, 1993.

          1.5   References


            The requirements of this Rule arise from the provisions of the
            California Clean Air Act and amendments (Health and Safety Code
            Section 40910 et seq.) and the Federal Clean Air Act and
            amendments (42 U.S.C. Section 7401 et seq.)




          PART 2  DEFINITIONS


          2.1   British Thermal Unit (Btu)

            The quantity of heat required to raise the temperature of one
            pound of water one degree Fahrenheit (oF) at or near 39.2
            degrees Fahrenheit.


          2.2   Nitrogen Oxides

            The sum of the molecular forms of nitrogen oxide and nitrogen
            dioxide.  When measured or calculated, the total of the two
            molecular forms are collectively expressed as nitrogen dioxide.




          PART 3  REQUIREMENTS AND STANDARDS


          3.1   Emission Limits

            Any person shall not discharge from any single source
            whatsoever any one or more of the following contaminants in any
            state or combination thereof, exceeding in concentration or
            amount at the point of discharge to the atmosphere;

            3.1.1   sulfur compounds calculated as sulfur dioxide (SO2),
                    0.2 percent by volume;

            3.1.2   nitrogen oxides, calculated as nitrogen dioxide (NO2),
                    140 pounds per hour from any new or expanded boiler,
                    furnace, jet engine, or similar fuel burning equipment
                    used for the production of power or heat;

            3.1.3   from fuel burning equipment having a maximum heat input
                    rate of more than 1-1/2 billion Btu per hour (gross),
                    flue gas having a concentration of nitrogen oxides
                    calculated as nitrogen dioxide (NO2) in parts per
                    million parts of flue gas (ppm) by volume at 3 per cent
                    oxygen, 225 ppm with natural gas, liquid or solid fuel;
                    or,

            3.1.4   from sources other than combustion sources, nitrogen
                    oxides, calculated as nitrogen dioxide (NO2), 250 parts
                    per million by volume.


          3.2   Measurement Methods

            3.2.1   For determination of SO2 emissions concentrations in
                    stack gases during stationary source tests, 40 Code of
                    Federal Regulations (CFR) Part 60, App. A, Methods 6 or
                    6C (EPA Methods 6 or 6C, "Determination of Sulfur
                    Dioxide Emissions from Stationary Sources"), or
                    California Air Resources Board (ARB) Method 100,
                    "Procedures for Continuous Gaseous Emission Stack
                    Sampling", shall be performed.

            3.2.2   For determination of NOx emissions concentrations in
                    stack gases during stationary source tests, 40 CFR Part
                    60, App. A, Method 7E (EPA Method 7E, "Determination of
                    Nitrogen Oxides Emissions from Stationary Sources
                    (Instrumental Analyzer Procedure)"), or ARB Method 100,
                    "Procedures for Continuous Gaseous Emission Stack
                    Sampling", shall be performed.


          3.3   Recordkeeping Requirements

            For any source subject to this Rule, permanent records, or
            records in a District-approved electronic format, shall be
            maintained for a period of five years after creation and shall
            be made available for inspection by the Air Pollution Control
            Officer upon request.  The records shall include, but are not
            limited to, the date and time of testing, the parameters which
            were measured and the contaminant concentrations or emission
            rates in the same units as the emission limits.

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          091593                                               Rule 404:  1