AMAAPCD RULE 523 LIMIT POTENTIAL TO EMIT                     
LAST REVISED 06/13/95
                     
                     
                     
                     RULE 523 LIMIT POTENTIAL TO EMIT

                                   INDEX

                                                                       PAGE
523.1     APPLICABILITY. . . . . . . . . . . . . . . . . . . . . . . .   1 

     A.   GENERAL APPLICABILITY. . . . . . . . . . . . . . . . . . . .   1 
     B.   STATIONARY SOURCE WITH DE MINIMIS EMISSIONS. . . . . . . . .   1 
     C.   PROVISION FOR AIR POLLUTION CONTROL EQUIPMENT. . . . . . . .   3 
     D.   EXEMPTION, STATIONARY SOURCE SUBJECT TO RULE 523
          TITLE V - FEDERAL OPERATING PERMIT PROGRAM . . . . . . . . .   3 
     E.   EXEMPTION, STATIONARY SOURCE WITH A LIMITATION
          ON POTENTIAL TO EMIT . . . . . . . . . . . . . . . . . . . .   4 
     F.   WITHIN THREE YEARS OF EFFECTIVE DATE OF RULE 523
          TITLE V - FEDERAL OPERATING PERMIT PROGRAM . . . . . . . . .   5 
     G.   RULE SHALL NOT RELIEVE STATIONARY SOURCE FROM
          COMPLYING WITH REQUIREMENTS OF PRECONSTRUCTION
          PERMIT . . . . . . . . . . . . . . . . . . . . . . . . . . .   5 

523.2     DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . .   5 

     A.   12-MONTH PERIOD. . . . . . . . . . . . . . . . . . . . . . .   5 
     B.   ACTUAL EMISSIONS . . . . . . . . . . . . . . . . . . . . . .   5 
     C.   ALTERNATIVE OPERATIONAL LIMIT. . . . . . . . . . . . . . . .   6 
     D.   EMISSION UNIT. . . . . . . . . . . . . . . . . . . . . . . .   6 
     E.   FEDERAL CLEAN AIR ACT. . . . . . . . . . . . . . . . . . . .   6 
     F.   HAZARDOUS AIR POLLUTANT. . . . . . . . . . . . . . . . . . .   6 
     G.   MAJOR SOURCE OF REGULATED AIR POLLUTANTS
          (EXCLUDING HAPs) . . . . . . . . . . . . . . . . . . . . . .   6 
     H.   MAJOR SOURCE OF HAZARDOUS AIR POLLUTANTS . . . . . . . . . .   6 
     I.   PART 70 PERMIT . . . . . . . . . . . . . . . . . . . . . . .   7 
     J.   POTENTIAL TO EMIT. . . . . . . . . . . . . . . . . . . . . .   7 
     K.   PROCESS STATEMENT. . . . . . . . . . . . . . . . . . . . . .   7 
     L.   REGULATED AIR POLLUTANT. . . . . . . . . . . . . . . . . . .   7 

523.3     EMISSION LIMITATIONS . . . . . . . . . . . . . . . . . . . .   8 

523.4     RECORDKEEPING REQUIREMENTS . . . . . . . . . . . . . . . . .   9 

523.5     REPORTING REQUIREMENTS . . . . . . . . . . . . . . . . . . .  13 

523.6     ALTERNATIVE OPERATIONAL LIMIT 
          AND REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . .  14 

523.7     VIOLATIONS . . . . . . . . . . . . . . . . . . . . . . . . .  16 
                                 RULE 523

                          LIMIT POTENTIAL TO EMIT


523.1     APPLICABILITY

     A.   GENERAL APPLICABILITY:  This rule shall apply to any
          stationary source which would, if it did not comply
          with the limitations set forth in this rule, have the
          potential to emit air contaminants equal to or in
          excess of the threshold for a major source of regulated
          air pollutants or a major source of hazardous air
          pollutants (HAPs) and which meets one of the following
          conditions:

          1.   In every 12-month period, the actual emissions of
               the stationary source are less than or equal to
               the emission limitations specified in section
               523.3 A., below; or

          2.   In every 12-month period, at least 90 percent of
               the emissions from the stationary source are
               associated with an operation limited by any one of
               the alternative operational limits specified in
               section 523.6 A., below.

     B.   STATIONARY SOURCE WITH DE MINIMIS EMISSIONS:  The
          recordkeeping and reporting provisions in sections
          523.4, 523.5 and 523.6 below shall not apply to a
          stationary source with de minimis emissions or
          operations as specified in either subsection 523.1
          B.1., or 523.1 B.2., below:

          1.   In every 12-month period, the stationary source
               emits less than or equal to the following
               quantities of emissions:

               a.   5 tons per year of a regulated air pollutant
                    (excluding HAPs), 

               b.   2 tons per year of a single HAP,

               c.   5 tons per year of any combination of HAPs,
                    and
 
               d.   20 percent of any lesser threshold for a
                    single HAP that the United States
                    Environmental Protection Agency (U.S. EPA)
                    may establish by rule.

          2.   In every 12-month period, at least 90 percent of
               the stationary source's emissions are associated
               with an operation for which the throughput is less
               than or equal to one of the quantities specified
               in subsections 523.1 B.2.a., through 523.1 B.2.i.,
               below:

               a.   1,400 gallons of any combination of solvent-
                    containing materials but no more than 550
                    gallons of any one solvent-containing
                    material, provided that the materials do not
                    contain the following:  methyl chloroform
                    (1,1,1-trichloroethane), methylene chloride
                    (dichloromethane), tetrachloroethylene
                    (perchloroethylene), or trichloroethylene;

               b.   750 gallons of any combination of solvent-
                    containing materials where the materials
                    contain the following:  methyl chloroform
                    (1,1,1-trichloroethane), methylene chloride
                    (dichloromethane), tetrachloroethylene
                    (perchloroethylene), or trichloroethylene,
                    but not more than 300 gallons of any one
                    solvent-containing material;

               c.   4,400,000 gallons of gasoline dispensed from
                    equipment with Phase I and II vapor recovery
                    systems;

               d.   470,000 gallons of gasoline dispensed from
                    equipment without Phase I and II vapor
                    recovery systems;

               e.   1,400 gallons of gasoline combusted;

               f.   16,600 gallons of diesel fuel combusted;

               g.   500,000 gallons of distillate oil combusted,
                    or


               h.   71,400,000 cubic feet of natural gas
                    combusted.     

          Within 30 days of a written request by the District or
          the U.S. EPA, the owner or operator of a stationary
          source not maintaining records pursuant to sections
          523.4 or 523.6 shall demonstrate that the stationary
          source's emissions or throughput are not in excess of
          the applicable quantities set forth in subsection 523.1
          B.1., or 523.1 B.2., above.

     C.   PROVISION FOR AIR POLLUTION CONTROL EQUIPMENT:  The
          owner or operator of a stationary source may take into
          account the operation of air pollution control
          equipment on the capacity of the source to emit an air
          contaminant if the equipment is required by Federal,
          State, or District rules and regulations or permit
          terms and conditions.  The owner or operator of the
          stationary source shall maintain and operate such air
          pollution control equipment in a manner consistent with
          good air pollution control practice for minimizing
          emissions.  This provision shall not apply after
          January 1, 1999 unless such operational limitation is
          federally enforceable or unless the District Board
          specifically extends this provision and it is submitted
          to the U.S. EPA.  Such extension shall be valid unless,
          and until, the U.S. EPA disapproves the extension of
          this provision.

     D.   EXEMPTION, STATIONARY SOURCE SUBJECT TO RULE 500 TITLE
          V - FEDERAL OPERATING PERMIT PROGRAM:  This rule shall
          not apply to the following stationary sources:

          1.   Any stationary source whose actual emissions,
               throughput, or operation, at any time after the
               effective date of this rule, is greater than the
               quantities specified in sections 523.3 A or 523.6
               A., below and which meets both of the following
               conditions:

               a.   The owner or operator has notified the
                    District at least 30 days prior to any
                    exceedance that s/he will submit an
                    application for a Part 70 permit, or
                    otherwise obtain federally-enforceable permit
                    limits, and

               b.   A complete Part 70 permit application is
                    received by the District, or the permit
                    action to otherwise obtain federally-
                    enforceable limits is completed, within 12
                    months of the date of notification.

          However, the stationary source may be immediately
          subject to applicable federal requirements, including
          but not limited to, a maximum achievable control
          technology  (MACT) standard.

          2.   Any stationary source that has applied for a Part
               70 permit in a timely manner and in conformance
               with Rule 500 TITLE V - FEDERAL OPERATING PERMIT
               PROGRAM, and is awaiting final action by the
               District and U.S. EPA.

          3.   Any stationary source required to obtain an
               operating permit under Rule 500 TITLE V - FEDERAL
               OPERATING PERMIT PROGRAM for any reason other than
               being a major source.

          4.   Any stationary source with a valid Part 70 permit.

          Notwithstanding subsections 523.1 D.2., and 523.1 D.4.,
          above, nothing in this section shall prevent any
          stationary source which has had a Part 70 permit from
          qualifying to comply with this rule in the future in
          lieu of maintaining an application for a Part 70 permit
          or upon rescission of a Part 70 permit if the owner or
          operator demonstrates that the stationary source is in
          compliance with the emissions limitations in section
          523.3 A., below or an applicable alternative
          operational limit in section 523.6 A., below.

     E.   EXEMPTION, STATIONARY SOURCE WITH A LIMITATION ON
          POTENTIAL TO EMIT: this rule shall not apply to any
          stationary source which has a valid operating permit
          with federally-enforceable conditions or other
          federally-enforceable limits limiting its potential to
          emit to below the applicable threshold(s) for a major
          source as defined in sections 523.2 G. and 523.2 E.
          below. 

     F.   Within three years of the effective date of Rule 500
          TITLE V - FEDERAL OPERATING PERMIT PROGRAM, the
          District shall maintain and make available to the
          public upon request, for each stationary source subject
          to this rule, information identifying the provisions of
          this rule applicable to the source.

     G.   This rule shall not relieve any stationary source from
          complying with requirements pertaining to any otherwise
          applicable preconstruction permit, or to replace a
          condition or term of any preconstruction permit, or any
          provision of a preconstruction permitting program. 
          This does not preclude issuance of any preconstruction
          permit with conditions or terms necessary to ensure
          compliance with this rule.

523.2      DEFINITIONS

          All terms shall retain the definitions provided under
          Rule 500 TITLE V - FEDERAL OPERATING PERMIT PROGRAM,
          unless otherwise defined herein.


     A.   12-MONTH PERIOD:  A period of twelve consecutive months
          determined on a rolling basis with a new 12-month
          period beginning on the first day of each calendar
          month.

     B.   ACTUAL EMISSIONS:  The emissions of a regulated air
          pollutant from a stationary source for every 12-month
          period.  Valid continuous emission monitoring data or
          source test data shall be preferentially used to
          determine actual emissions.  In the absence of valid
          continuous emissions monitoring data or source test
          data, the basis for determining actual emissions shall
          be: throughputs of process materials; throughputs of
          materials stored; usage of materials; data provided in
          manufacturer's product specifications, material
          volatile organic compound (VOC) content reports or
          laboratory analyses; other information required by this
          rule and applicable District, State and Federal
          regulations; or information requested in writing by the
          District.  All calculations of actual emissions shall
          use U.S. EPA, California Air Resources Board (CARB) or
          District approved methods, including emission factors
          and assumptions.   

     C.   ALTERNATIVE OPERATIONAL LIMIT: A limit on a measurable
          parameter, such as hours of operation, throughput of
          materials, use of materials, or quantity of product, as
          specified in Section 523.6, Alternative Operational
          Limit and Requirements. 

     D.   EMISSION UNIT:  Any article, machine, equipment,
          operation, contrivance or related groupings of such
          that may produce and/or emit any regulated air
          pollutant or hazardous air pollutant. 

     E.   FEDERAL CLEAN AIR ACT:  The federal Clean Air Act (CAA)
          as amended in 1990 (42 U.S.C. section 7401 et seq.) and
          its implementing regulations. 
     
     F.   HAZARDOUS AIR POLLUTANT:  Any air pollutant listed
          pursuant to section 112(b) of the federal Clean Air
          Act.

     G.   MAJOR SOURCE OF REGULATED AIR POLLUTANTS (excluding
          HAPs):  A stationary source that emits or has the
          potential to emit a regulated air pollutant (excluding
          HAPs) in quantities equal to or exceeding the lesser of
          any of the following thresholds:

          1.   100 tons per year (tpy) of any regulated air
               pollutant;

          2.   50 tpy of volatile organic compounds or oxides of
               nitrogen for a federal ozone nonattainment area
               classified as serious, 25 tpy for an area
               classified as severe, or 10 tpy for an area
               classified as extreme; and

          3.   70 tpy of PM10 for a federal PM10 nonattainment
               area classified as serious.

     Fugitive emissions of these pollutants shall be considered
     in calculating total emissions for stationary sources in
     accordance with 40 CFR Part 70.2 "Definitions- Major
     source(2)."

     H.   MAJOR SOURCE OF HAZARDOUS AIR POLLUTANTS:  A stationary
          source that emits or has the potential to emit 10 tons
          per year or more of a single HAP listed in section
          112(b) of the CAA, 25 tons per year or more of any
          combination of HAPs, or such lesser quantity as the
          U.S. EPA  may establish by rule.  Fugitive emissions of
          HAPs shall be considered in calculating emissions for
          all stationary sources.  The definition of a major
          source of radionuclides shall be specified by rule by
          the U.S. EPA.

     I.   PART 70 PERMIT:  An operating permit issued to a
          stationary source pursuant to an interim, partial or
          final Title V program approved by the U.S. EPA.

     J.   POTENTIAL TO EMIT:  The maximum capacity of a
          stationary source to emit a regulated air pollutant
          based on its physical and operational design.  Any
          physical or operational limitation on the capacity of
          the stationary source to emit a pollutant, including
          air pollution control equipment and restrictions on
          hours of operation or on the type or amount of material
          combusted, stored, or processed, shall be treated as
          part of its design only if the limitation is federally
          enforceable.    

     K.   PROCESS STATEMENT:  An annual report on permitted
          emission units from an owner or operator of a
          stationary source certifying under penalty of perjury
          the following:  throughputs of process materials;
          throughputs of materials stored; usage of materials;
          fuel usage; any available continuous emissions
          monitoring data; hours of operation; and any other
          information required by this rule or requested in
          writing by the District.


     L.   REGULATED AIR POLLUTANT:  The following air pollutants
          are regulated:

          1.   Oxides of nitrogen and volatile organic compounds;

          2.   Any pollutant for which a national ambient air
               quality standard has been promulgated;

          3.   Any Class I or Class II ozone depleting substance
               subject to a standard promulgated under Title VI
               of the federal Clean Air Act;

          4.   Any pollutant that is subject to any standard
               promulgated under section 111 of the federal Clean
               Air Act; and

          5.   Any pollutant subject to a standard or requirement
               promulgated pursuant to section 112 of the federal
               Clean Air Act, including:

               a.   Any pollutant listed pursuant to section
                    112(r) (Prevention of Accidental Releases)
                    shall be considered a regulated air pollutant
                    upon promulgation of the list.

               b.   Any HAP subject to a standard or other
                    requirement promulgated by the U.S. EPA
                    pursuant to section 112(d) or adopted by the
                    District pursuant to 112(g) and (j) shall be
                    considered a regulated air pollutant for all
                    sources or categories of sources:  1) upon
                    promulgation of the standard or requirement,
                    or 2) 18 months after the standard or
                    requirement was scheduled to be promulgated
                    pursuant to section 112(e)(3).

               c.   Any HAP subject to a District case-by-case
                    emissions limitation determination for a new
                    or modified source, prior to the U.S. EPA
                    promulgation or scheduled promulgation of an
                    emissions limitation shall be considered a
                    regulated air pollutant when the
                    determination is made pursuant to section
                    112(g)(2).  In case-by-case emissions
                    limitation determinations, the HAP shall be
                    considered a regulated air pollutant only for
                    the individual source for which the emissions
                    limitation determination was made.


523.3     EMISSION LIMITATIONS

     A.   Unless the owner or operator has chosen to operate the
          stationary source under an alternative operational
          limit specified in section 523.6 A., below, no
          stationary source subject to this rule shall emit in
          every 12-month period more than the following
          quantities of emissions:

          1.   50 percent of the major source thresholds for
               regulated air pollutants (excluding HAPs),
     
          2.   5 tons per year of a single HAP,

          3.   12.5 tons per year of any combination of HAPs, and

          4.   50 percent of any lesser threshold for a single
               HAP as the U.S. EPA may establish by rule.

     B.   The APCO shall evaluate a stationary source's
          compliance with the emission limitations in section
          523.3 A., above as part of the District's annual permit
          renewal process required by Health & Safety Code
          section 42301(e).  In performing the evaluation, the
          APCO shall consider any annual process statement
          submitted pursuant to Section 523.5, Reporting
          Requirements.  In the absence of valid continuous
          emission monitoring data or source test data, actual
          emissions shall be calculated using emissions factors
          approved by the U.S. EPA , CARB, or the APCO. 

     C.   Unless the owner or operator has chosen to operate the
          stationary source under an alternative operational
          limit specified in section 523.6 A., below, the owner
          or operator of a stationary source subject to this rule
          shall obtain any necessary permits prior to commencing
          any physical or operational change or activity which
          will result in actual emissions that exceed the limits
          specified in section 523.3 A., above.

523.4     RECORDKEEPING REQUIREMENTS

          Immediately after adoption of this rule, the owner or
          operator of a stationary source subject to this rule
          shall comply with any applicable recordkeeping
          requirements in this section.  However, for a
          stationary source operating under an alternative
          operational limit, the owner or operator shall instead
          comply with the applicable recordkeeping and reporting
          requirements specified in Section 523.6 Alternative
          Operational Limit and Requirements.  The recordkeeping
          requirements of this rule shall not replace any
          recordkeeping requirement contained in an operating
          permit or in a District, State, or Federal rule or
          regulation. 

     A.   A stationary source previously covered by the
          provisions in section 523.1 B., above shall comply with
          the applicable provisions of section 523.4 above and
          sections 523.5 and 523.6 below if the stationary source
          exceeds the quantities specified in section 523.1 B.1.,
          above.

     B.   The owner or operator of a stationary source subject to
          this rule shall keep and maintain records for each
          permitted emission unit or groups of permitted emission
          units sufficient to determine actual emissions.  Such
          information shall be summarized in a monthly log,
          maintained on site for five years, and be made
          available to District, CARB, or U.S. EPA staff upon
          request.

          1.   Coating/Solvent Emission Unit

               The owner or operator of a stationary source
               subject to this rule that contains  a
               coating/solvent emission unit or uses a coating,
               solvent, ink or adhesive shall keep and maintain
               the following records:

               a.   A current list of all coatings, solvents,
                    inks and adhesives in use.  This list shall
                    include:  information on the manufacturer,
                    brand, product name or code, VOC content in
                    grams per liter or pounds per gallon, HAPS
                    content in grams per liter or pounds per
                    gallon, or manufacturer's product
                    specifications, material VOC content reports
                    or laboratory analyses providing this
                    information;

               b.   A description of any equipment used during
                    and after coating/solvent application,
                    including type, make and model; maximum
                    design process rate or throughput; control
                    device(s) type and description (if any); and
                    a description of the coating/solvent
                    application/drying method(s) employed;

               c.   A monthly log of the consumption of each
                    solvent (including solvents used in clean-up
                    and surface preparation), coating, ink and
                    adhesive used; and

               d.   All purchase orders, invoices, and other
                    documents to support information in the
                    monthly log.

          2.   Organic Liquid Storage Unit

               The owner or operator of a stationary source
               subject to this rule that contains a permitted
               organic liquid storage unit shall keep and
               maintain the following records: 

               a.   A monthly log identifying the liquid stored
                    and monthly throughput; and

               b.   Information on the tank design and
                    specifications including control equipment. 

          3.   Combustion Emission Unit

               The owner or operator of a stationary source
               subject to this rule that contains a combustion
               emission unit shall keep and maintain the
               following records:

               a.   Information on equipment type, make and
                    model, maximum design process rate or maximum
                    power input/output, minimum operating
                    temperature (for thermal oxidizers) and
                    capacity, control device(s) type and
                    description (if any) and all source test
                    information; and 

               b.   A monthly log of hours of operation, fuel
                    type, fuel usage, fuel heating value (for
                    non-fossil fuels; in terms of BTU/lb or
                    BTU/gal), percent sulfur for fuel oil and
                    coal, and percent nitrogen for coal.

          4.   Emission Control Unit

               The owner or operator of a stationary source
               subject to this rule that contains an emission
               control unit shall keep and maintain the following
               records:

               a.   Information on equipment type and
                    description, make and model, and emission
                    units served by the control unit;

               b.   Information on equipment design including
                    where applicable:  pollutant(s) controlled;
                    control effectiveness; maximum design or
                    rated capacity; inlet and outlet
                    temperatures, and concentrations for each
                    pollutant controlled; catalyst data (type,
                    material, life, volume, space velocity,
                    ammonia injection rate and temperature);
                    baghouse data (design, cleaning method,
                    fabric material, flow rate, air/cloth ratio);
                    electrostatic precipitator data (number of
                    fields, cleaning method, and power input);
                    scrubber data (type, design, sorbent type,
                    pressure drop); other design data as
                    appropriate; all source test information; and

               c.   A monthly log of  hours of operation
                    including notation of any control equipment
                    breakdowns, upsets, repairs, maintenance and
                    any other deviations from design parameters.

          5.   General Emission Unit

               The owner or operator of a stationary source
               subject to this rule that contains an emission
               unit not included in subsections 523.4 B.1., 523.4
               B.2., or 523.4 B.3., above shall keep and maintain
               the following records:
 
               a.   Information on the process and equipment
                    including the following:  equipment type,
                    description, make and model; maximum design
                    process rate or throughput; control device(s)
                    type and description (if any); 

               b.   Any additional information requested in
                    writing by the APCO;

               c.   A monthly log of operating hours, each raw
                    material used and its amount, each product
                    produced and its production rate; and 

               d.   Purchase orders, invoices, and other
                    documents to support information in the
                    monthly log. 

523.5     REPORTING REQUIREMENTS

     A.   At the time of annual renewal of a permit to operate
          under Rule 500 GENERAL PERMIT REQUIREMENTS, each owner
          or operator of a stationary source subject to this rule
          shall submit to the District a process statement.  The
          statement shall be signed by the owner or operator and
          certify that the information provided is accurate and
          true.
     
     B.   For the purpose of determining compliance with this rule,
          this requirement shall not apply to stationary sources which
          emit in every 12-month period less than or equal to the
          following quantities:

          1.   For any regulated air pollutant (excluding HAPs),

               a.   25 tons per year including a regulated air
                    pollutant for which the District has a
                    federal area designation of attainment,
                    unclassified, transitional, or moderate
                    nonattainment,

               b.   15 tons per year for a regulated air
                    pollutant for which the District has a
                    federal area designation of serious
                    nonattainment,

               c.   6.25 tons per year for a regulated air
                    pollutant for which the District has a
                    federal area designation of severe
                    nonattainment, 

          2.   2.5 tons per year of a single HAP,

          3.   6.25 tons per year of any combination of HAPs, and
 
          4.   25 percent of any lesser threshold for a single
               HAP as the U.S. EPA may establish by rule.

     C.   A stationary source previously covered by provisions in
          section 523.5 B. above shall comply with the provisions
          of section 523.5 A. above if the stationary source
          exceeds the quantities specified in section 523.5 B.

     D.   Any additional information requested by the APCO under
          section 523.5 A. above shall be submitted to the APCO
          within 30 days of the date of request.

523.6     ALTERNATIVE OPERATIONAL LIMIT AND REQUIREMENTS

     The owner or operator may operate the permitted emission
     units at a stationary source subject to this rule under any
     one alternative operational limit, provided that at least 90
     percent of the stationary source's emissions in every 12-
     month period are associated with the operation(s) limited by
     the alternative operational limit. 

     A.   Upon choosing to operate a stationary source subject to
          this rule under any one alternative operational limit,
          the owner or operator shall operate the stationary
          source in compliance with the alternative operational 
          limit and comply with the specified recordkeeping and
          reporting requirements.
  
          1.   The owner or operator shall report within 24 hours
               to the APCO any exceedance of the alternative
               operational limit.

          2.   The owner or operator shall maintain all purchase
               orders, invoices, and other documents to support
               information required to be maintained in a monthly
               log.  Records required under this section shall be 
               maintained on site for five years and be made
               available to District or U.S. EPA staff upon
               request.

          3.   Gasoline Dispensing Facility Equipment with Phase
               I and II Vapor Recovery Systems

               The owner or operator shall operate the gasoline
               dispensing equipment in compliance with the
               following requirements:

               a.   No more than 7,000,000 gallons of gasoline
                    shall be dispensed in every 12-month period.

               b.   A monthly log of gallons of gasoline
                    dispensed in the preceding month with a
                    monthly calculation of the total gallons
                    dispensed in the previous 12 months shall be
                    kept on site.  

               c.   A copy of the monthly log shall be submitted
                    to the APCO at the time of annual permit
                    renewal.  The owner or operator shall certify
                    that the log is accurate and true.

          4.   Degreasing or Solvent-Using Unit

               The owner or operator shall operate the degreasing
               or solvent-using unit(s) in compliance with the
               following requirements:

               a.   i.   If the solvents do not include methyl
                         chloroform (1,1,1-trichloroethane),
                         methylene chloride (dichloromethane),
                         tetrachloroethylene (perchloroethylene),
                         or trichloroethylene, no more than 5,400
                         gallons of any combination of solvent-
                         containing materials and no more than
                         2,200 gallons of any one solvent-
                         containing material shall be used in
                         every 12-month period,.

                    ii.  If the solvents include methyl
                         chloroform (1,1,1-trichloroethane),
                         methylene chloride (dichloromethane),
                         tetrachloroethylene (perchloroethylene),
                         or trichloroethylene, no more than 2,900
                         gallons of any combination of solvent-
                         containing materials and no more than
                         1,200 gallons of any one solvent-
                         containing material shall be used in
                         every 12-month period. 

               b.   A monthly log of amount and type of solvent
                    used in the preceding month with a monthly
                    calculation of the total gallons used in the
                    previous 12 months shall be kept on site.  

               c.   A copy of the monthly log shall be submitted
                    to the APCO at the time of annual permit
                    renewal.  The owner or operator shall certify
                    that the log is accurate and true.

          5.   Diesel-Fueled Emergency Standby Engine(s) with
               Output Less Than 1,000 Brake Horsepower
          
               The owner or operator shall operate the emergency
               standby engine(s) in compliance with the following
               requirements:

               a.   For a federal ozone nonattainment area
                    classified as severe, the emergency standby
                    engine(s) shall not operate more than 1,300
                    hours in 12-month period and shall not use
                    more than 66,000 gallons of diesel fuel in
                    every 12-month period.

               b.   A monthly log of hours of operation, gallons
                    of fuel used, and a monthly calculation of
                    the total hours operated and gallons of fuel
                    used in the previous 12 months shall be kept
                    on site.  

               c.   A copy of the monthly log shall be submitted
                    to the APCO at the time of annual permit
                    renewal.  The owner or operator shall certify
                    that the log is accurate and true.

     B.   The owner or operator of a stationary source subject to
          this rule shall obtain any necessary permits prior to
          commencing any physical or operational change or
          activity which will result in an exceedance of an
          applicable operational limit specified in section 523.6
          A., above.

523.7     VIOLATIONS

     A.   Failure to comply with any of the applicable provisions
          of this rule shall constitute a violation of this rule. 
          Each day during which a violation of this rule occurs
          is a separate offense.

     B.   A stationary source subject to this rule shall be
          subject to applicable federal requirements for a major
          source, including Rule 500 TITLE V - FEDERAL OPERATING
          PERMIT PROGRAM when the conditions specified in either
          subsections 523.7 B.1., or 523.7 B.2., below, occur:

          1.   Commencing on the first day following every 12-
               month period in which the stationary source
               exceeds a limit specified in section 523.3 A.,
               above and any applicable alternative operational
               limit specified in section 523.6 A., above, or

          2.   Commencing on the first day following every 12-
               month period in which the owner or operator can
               not demonstrate that the stationary source is in
               compliance with the limits in section 523.3 A.,
               above or any applicable alternative operational
               limit specified in section 523.6 A., above.






































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ADOPTED:  

AMENDED:  

RESCINDED:     

REVISED: 6/13/95

R521PTE.ED2