SLOAPCD RULE 421 FEDERAK OART 70 PTL TO EMIT LMTNS
LAST REVISED 05/24/95

RULE 421.     FEDERAL PART 70 POTENTIAL TO EMIT LIMITATIONS
               (Adopted 5/24/95)


     A.     APPLICABILITY

          1.   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:

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

               b.   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 Subsection F.1 below.

          2.   Stationary Source with De Minimis Emissions.  The 
               recordkeeping and reporting provisions in Sections D, E, and F 
               below shall not apply to a stationary source with de minimis 
               emissions or operations as specified in either Subsection 
               A.2.a or A.2.b below:

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

                    1)   5 tons per year of a regulated air pollutant, 
                         excluding HAPs,  
                    
                    2)   2 tons per year of a single HAP,

                    3)   5 tons per year of any combination of HAPs, and
 
                    4)   20 percent of any lesser threshold for a single HAP 
                         that the United States Environmental Protection 
                         Agency (EPA) may establish by rule.

               b.   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 A.2.b.1
                    through A.2.b.10 below:

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

                    2)   750 gallons of any combination of organic solvent-
                         containing materials where the materials contain the 
                         following: methyl chloroform (1,1,1-trichloroethane), 
                         methylene chloride (dichloromethane), tetrachloro-
                         ethylene (perchloroethylene), or trichloroethylene, 
                         but not more than 300 gallons of any one organic
                         solvent-containing material;

                    3)   1,408 gallons of organic solvent-containing or 
                         volatile organic compound (VOC) containing material 
                         used at a paint spray unit(s) subject to Rule 411, 
                         Surface Coating of Metal Parts and Products;

                    4)   879 gallons of organic solvent-containing or VOC 
                         containing material, including no more than 20 
                         gallons of organic solvent-containing or VOC-
                         containing pretreatment wash primer or precoat, 
                         at a paint spray unit(s) subject to Rule 423, Motor 
                         Vehicle and Mobile Equipment Coating Operations;

                         (a)  The VOC content of pretreatment wash primers 
                              and precoats shall not exceed 6.5 lb/gallon of 
                              coating, as applied, less water and exempt 
                              compounds.  The VOC content of all other 
                              coatings shall not exceed 4.5 lbs/gallon of 
                              coating, as applied, less water and exempt 
                              compounds.

                    5)   4,400,000 gallons of gasoline dispensed from 
                         equipment with Phase I and II vapor recovery systems;
                         
                    6)   470,000 gallons of gasoline dispensed from equipment 
                         without Phase I and II vapor recovery systems;

                    7)   1,400 gallons of gasoline combusted;

                    8)   16,600 gallons of diesel fuel combusted;

                    9)   500,000 gallons of distillate oil combusted; or

                    10)  71,400,000 cubic feet of natural gas combusted.     

               Within 30 calendar days of a written request by the District 
               or the EPA, the owner or operator of a stationary source not 
               maintaining records pursuant to Section D or F shall 
               demonstrate that the stationary source's emissions or 
               throughput are not in excess of the applicable quantities set 
               forth in Subsection A.2.a or A.2.b above.

          3.   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 EPA.  Such extension shall be valid unless,
               and until, the EPA disapproves the extension of this provision.

          4.   Exemption, Stationary Source Subject to Rule 216, Federal Part 
               70 Permits.  This Rule shall not apply to the following 
               stationary sources:

               a.   Any stationary source whose actual emissions, throughput, 
                    or operation, at any time after the effective of this 
                    Rule, is greater than the quantities specified in 
                    Subsection C.1 or F.1 below and which meets both of the
                    following conditions:

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

                    2)   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.

               b.   Any stationary source that has applied for a Part 70 
                    permit in a timely manner and in conformance with 
                    Rule 216, Federal Part 70 Permits, and is awaiting final 
                    action by the District and EPA.

               c.   Any stationary source required to obtain an operating 
                    permit under Rule 216, Federal Part 70 Permits, for any 
                    reason other than being a major source.

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

               Notwithstanding Subsections A.4.b and A.4.d 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 Subsection C.1 
               below or an applicable alternative operational limit in 
               Subsection F.1 below.

          5.   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 Subsections B.7 and B.8 below. 

          6.   Within three years of the effective date of Rule 216, Federal 
               Part 70 Permits, 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.

          7.   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.

     B.   DEFINITIONS.  All terms shall retain the definitions provided under 
          Rule 216, Federal Part 70 Permits, unless otherwise defined herein.
          
          1.   "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.

          2.   "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 
               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 
               EPA, California Air Resources Board (CARB) or District 
               approved methods, including emission factors and assumptions.   

          3.   "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 F, Alternative Operational Limit and Requirements. 

          4.   "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. 

          5.   "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. 
     
          6.   "Hazardous Air Pollutant":  Any air pollutant listed pursuant 
               to Section 112(b) of the CAA. 

          7.   "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 100 tons per year (tpy) of any regulated air
               pollutant.  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)."

          8.   "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 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 EPA .

          9.   "Part 70 Permit":  An operating permit issued to a stationary 
               source pursuant to an interim, partial, or final Title V 
               program approved by the EPA.

          10.  "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.  
          
          11.  "Process Statement":  An annual report, for the preceding 
               12-month period, 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.

          12.  "Regulated Air Pollutant": The following air pollutants are 
               regulated:

               a.   Oxides of nitrogen and VOCs; 

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

               c.   Any Class I or Class II ozone depleting substance subject 
                    to a standard promulgated under Title VI of the CAA; 

               d.   Any pollutant that is subject to any standard promulgated 
                    under Section 111 of the CAA; and

               e.   Any pollutant subject to a standard or requirement 
                    promulgated pursuant to Section 112 of the CAA, 
                    including: 
                    
                    1)   Any pollutant listed pursuant to Section 112(r), 
                         Prevention of Accidental Releases, shall be 
                         considered a regulated air pollutant upon 
                         promulgation of the list.

                    2)   Any HAP subject to a standard or other requirement 
                         promulgated by the 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:  upon 
                         promulgation of the standard or requirement, or 
                         18 months after the standard or requirement was 
                         scheduled to be promulgated pursuant to Section 
                         112(e)(3).

                    3)   Any HAP subject to a District case-by-case emissions 
                         limitation determination for a new or modified 
                         source, prior to the 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. 

     C.     EMISSION LIMITATIONS

          1.   Unless the owner or operator has chosen to operate the 
               stationary source under an alternative operational limit 
               specified in Subsection F.1 below, no stationary source 
               subject to this Rule shall emit in every 12-month period 
               more than the following quantities of emissions:

               a.   50 tons per year of regulated air pollutants, excluding 
                    HAPs, 
               
               b.   5 tons per year of a single HAP,

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

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

          2.   The Air Pollution Control Officer (APCO) shall evaluate a 
               stationary source's compliance with the emission limitations 
               in Subsection C.1 above as part of the District's periodic 
               permit renewal process required by Health & Safety Code 
               Section 42301(e).  For those sources with a renewal period 
               longer than one year, the APCO shall evaluate their compliance 
               annually.  In performing the evaluation, the APCO shall 
               consider any annual process statement submitted pursuant to 
               Section E, 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 EPA, CARB, or the APCO. 

          3.   Unless the owner or operator has chosen to operate the 
               stationary source under an alternative operational limit 
               specified in Subsection F.1 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 Subsection C.1
               above.

     D.   RECORDKEEPING REQUIREMENTS.  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 F, 
          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.

          1.   A stationary source previously covered by the provisions in 
               Subsection A.2 above shall comply with the applicable 
               provisions of Section D above and Sections E and F below if 
               the stationary source exceeds the quantities specified in 
               Subsection A.2.a above.

          2.   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 EPA staff upon 
               request.

               a.   Coating/Organic Solvent Emission Unit.  The owner or 
                    operator of a stationary source subject to this Rule that 
                    contains a coating/organic solvent emission unit or uses 
                    a coating, organic solvent, ink or adhesive shall keep
                    and maintain the following records:

                    1)   A current list of all coatings, organic 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;
                    
                    2)   A description of any equipment used during and after 
                         coating/organic 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/organic 
                         solvent application/drying method(s) employed;

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

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

               b.   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: 

                    1)   A monthly log identifying the liquid stored and 
                         monthly throughput; and

                    2)   Information on the tank design and specifications 
                         including control equipment. 

               c.   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:

                    1)   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 

                    2)   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.

               d.   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:

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

                    2)   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 
                         concerning type, material, life, volume, space 
                         velocity, ammonia injection rate, and temperature;
                         baghouse data concerning design, cleaning method, 
                         fabric material, flow rate,  and air/cloth ratio; 
                         electrostatic precipitator data concerning number 
                         of fields, cleaning method, and power input; 
                         scrubber data concerning type, design, sorbent type, 
                         and pressure drop; other design data as appropriate; 
                         all source test information; and 

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

               e.   General Emission Unit.  The owner or operator of a 
                    stationary source subject to this Rule that contains an 
                    emission unit not included in Subsections D.2.a, D.2.b, 
                    or D.2.c above shall keep and maintain the following 
                    records:
 
                    1)   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; 

                    2)   Any additional information requested in writing by 
                         the APCO;

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

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

     E.   REPORTING REQUIREMENTS

          1.   At the time of annual renewal of a permit to operate under 
               Rule 210, Periodic Renewal of Permits to Operate, each owner 
               or operator of a stationary source subject to this Rule shall 
               submit to the District a process statement.  For those sources 
               with a renewal period longer than one year, interim process 
               statements shall be submitted annually on the first business 
               day of the anniversary month of their permit.  The statement 
               shall be signed by the owner or operator and certify that the 
               information provided is accurate and true.
  
          2.   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:

               a.   25 tons per year of any regulated air pollutant, 
                    excluding HAPs, 

               b.   2.5 tons per year of a single HAP,

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

          3.   A stationary source previously covered by provisions in 
               Subsection E.2 above shall comply with the provisions of 
               Subsection E.1 above if the stationary source exceeds the 
               quantities specified in Subsection E.2.
   
          4.   Any additional information requested by the APCO under 
               Subsection E.1 above shall be submitted to the APCO within 
               30 calendar days of the date of request.

     F.   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. 

          1.  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.
  
              a.   The owner or operator shall report within 24 hours to 
                   the APCO any exceedance of the alternative operational 
                   limit.

              b.   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 EPA 
                   staff upon request.

              c.   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:

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

                   2)   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.  

                   3)   A copy of the monthly logs for the preceding calendar 
                        year shall be submitted to the APCO no later than the 
                        first business day in February of each year.  The 
                        owner or operator shall certify that the log is 
                        accurate and true.

              d.   Degreasing or Organic Solvent-Using Unit.  The owner or 
                   operator shall operate the degreasing or organic 
                   solvent-using unit(s) in compliance with the following 
                   requirements:

                   1)   Usage limits:

                        (a)  If the organic 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 
                             organic solvent-containing materials and no 
                             more than 2,200 gallons of any one organic 
                             solvent-containing material shall be used in 
                             every 12-month period.

                        (b)  If the organic 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 
                             organic solvent-containing materials and no 
                             more than 1,200 gallons of any one organic 
                             solvent-containing material shall be used in 
                             every 12-month period. 

                   2)   A monthly log of amount and type of organic 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.  

                   3)   A copy of the monthly logs for the preceding 12-month 
                        period shall be submitted to the APCO on the first 
                        business day of the anniversary month of the permit.  
                        For those sources with a renewal period longer than 
                        one year, a copy of the monthly logs for the 
                        preceding 12-month period shall be submitted annually 
                        on the first business day of the anniversary month of 
                        the permit.  The owner or operator shall certify that 
                        the log is accurate and true.
  
              e.   Paint Spraying Unit - Metal Surface Coating.  The owner or 
                   operator of a paint spray unit subject to Rule 411, 
                   Surface Coating of Metal Parts and Products, shall operate 
                   the paint spraying unit(s) in compliance with the 
                   following requirements:

                   1)   The total usage rate of all VOC-containing materials 
                        at the paint spray unit(s), including but not limited 
                        to, coatings, thinners, reducers, and cleanup 
                        solutions, shall not exceed 5,634 gallons in every 
                        12-month period.  

                   2)   A monthly log of the gallons of VOC-containing 
                        materials used in the preceding month with a monthly 
                        calculation of the total gallons used in the previous 
                        12 months shall be kept on site.  

                   3)   A copy of the monthly logs for the preceding 12-month 
                        period shall be submitted to the APCO on the first 
                        business day of the anniversary month of the permit.  
                        For those sources with a renewal period longer than 
                        one year, a copy of the monthly logs for the 
                        preceding 12-month period shall be submitted annually 
                        on the first business day of the anniversary month of 
                        the permit.  The owner or operator shall certify that 
                        the log is accurate and true.
  
              f.   Paint Spray Unit - Automobile Surface Coating.  The owner 
                   or operator of a paint spray unit subject to Rule 423, 
                   Motor Vehicle and Mobile Equipment Coating Operations, 
                   shall operate the paint spraying unit(s) in compliance 
                   with the following requirements:

                   1)   The total usage rate of all VOC-containing materials 
                        at the paint spray unit(s), including but not limited 
                        to, coatings, thinners, reducers, and cleanup 
                        solutions, shall not exceed 3,516 gallons in every 
                        12-month period including not more than 88 gallons of 
                        VOC-containing pretreatment wash primers and precoats 
                        in every 12-month period.

                        (a)  The VOC content of pretreatment wash primers 
                             and precoats shall not exceed 6.5 lb/gallon 
                             of coating, as applied, less water and exempt 
                             compounds.  The VOC content of all other coatings
                             shall not exceed 4.5 lbs/gallon of coating, as 
                             applied, less water and exempt compounds.

                   2)   A monthly log of the gallons of VOC-containing 
                        materials used in the preceding month with a monthly 
                        calculation of the total gallons used in the previous 
                        12 months shall be kept on site.  

                   3)   A copy of the monthly logs for the preceding 12-month 
                        period shall be submitted to the APCO on the first 
                        business day of the anniversary month of the permit.  
                        For those sources with a renewal period longer than 
                        one year, a copy of the monthly logs for the 
                        preceding 12-month period shall be submitted annually 
                        on the first business day of the anniversary month of 
                        the permit.  The owner or operator shall certify that 
                        the log is accurate and true.

              g.   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:

                   1)   The emergency standby engine(s) shall not operate 
                        more than 5,200 hours in every 12-month period and 
                        shall not use more than 265,000 gallons of diesel 
                        fuel in every 12-month period.
 
                   2)   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.  

                   3)   A copy of the monthly logs for the preceding 12-month 
                        period shall be submitted to the APCO on the first 
                        business day of the anniversary month of the permit.  
                        For those sources with a renewal period longer than 
                        one year, a copy of the monthly logs for the 
                        preceding 12-month period shall be submitted annually 
                        on the first business day of the anniversary month of 
                        the permit.  The owner or operator shall certify that 
                        the log is accurate and true.
 
          2.   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 Subsection F.1 above.

     G.   VIOLATIONS

          1.   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.

          2.   A stationary source subject to this Rule shall be subject to 
               applicable federal requirements for a major source, including 
               Rule 216, Federal Part 70 Permits, when the conditions 
               specified in either Subsection G.2.a or G.2.b below, occur:

               a.   Commencing on the first day following every 12-month 
                    period in which the stationary source exceeds a limit 
                    specified in Subsection C.1 above and any applicable 
                    alternative operational limit specified in Subsection F.1 
                    above; or

               b.   Commencing on the first day following every 12-month 
                    period in which the owner or operator cannot demonstrate 
                    that the stationary source is in compliance with the 
                    limits in Subsection C.1 above or any applicable 
                    alternative operational limit specified in Subsection F.1 
                    above.

     H.     COMPLIANCE SCHEDULE

          1.   The effective date of this Rule shall be January 25, 1997.