SACAQMD RULE 458 LARGE COMMERCIAL BREAD BAKERIES          
LAST REVISED 06/07/94

          SACRAMENTO METROPOLITAN AQMD                RULES AND REGULATIONS
                             RULE 458 LARGE COMMERCIAL BREAD BAKERIES
                                          Adopted 6-7-94

                                              INDEX

          100 GENERAL
              101  PURPOSE
              110  EXEMPTION, SMALL BAKERIES
              111  EXEMPTION, CHEMICALLY LEAVENED PRODUCTS

          200 DEFINITIONS
              201  BREAD
              202  EXEMPT COMPOUNDS
              203  LARGE COMMERCIAL BREAD BAKERY
              204  LEAVEN
              205  OVEN
              206  PROOFING BOX
              207  VOLATILE ORGANIC COMPOUNDS (VOC)

          300 STANDARDS
              301  EMISSION CONTROL REQUIREMENTS, NEW AND EXISTING OVENS

          400 ADMINISTRATIVE REQUIREMENTS
              401  OPERATION AND MAINTENANCE PLAN
              402  PROCEDURE FOR PROCESSING OPERATION AND MAINTENANCE PLAN
              403  COMPLIANCE SCHEDULE
              404  CALCULATION  FOR  VOC  MASS  EMISSION  RATE  AND PERCENT
                   CONTROL EFFICIENCY
              405  CALCULATION FOR SMALL BAKERIES EXEMPTION

          500 MONITORING AND RECORDS
              501  USAGE RECORDS
              502  TEST METHODS
          
          100 GENERAL

              101  PURPOSE:  To  limit  the  emission  of  volatile organic
                   compounds  from  bread  ovens at large commercial  bread
                   bakeries.

              110  EXEMPTION, SMALL BAKERIES:  This rule shall not apply to
                   bakeries whose total VOC emissions  for  each  and every
                   operating day are less than 100 pounds, as determined by
                   Section 405.

              111  EXEMPTION, CHEMICALLY LEAVENED PRODUCTS: This rule  does
                   not  apply  to equipment used exclusively for the baking
                   of bakery products leavened chemically in the absence of
                   yeast.

          200 DEFINITIONS

              201  BREAD: A perishable  foodstuff  prepared  from  a yeast-
                   leavened  dough  which  is  baked into products commonly
                   referred to as pan bread, buns,  rolls, or other similar
                   yeast-leavened products.

              202  EXEMPT  COMPOUNDS:  The following compounds  are  exempt
                   from the definition of VOC in Section 207.
                   202.1   methane
                   202.2   carbon dioxide
                   202.3   carbon monoxide
                   202.4   carbonic acid
                   202.5   metallic carbides or carbonates
                   202.6   ammonium carbonate
                   202.7   1,1,1-trichloroethane
                   202.8   methylene chloride
                   202.9   trichlorofluoromethane (CFC-11)
                   202.10  dichlorodifluoromethane (CFC-12)
                   202.11  chlorodifluoromethane (HCFC-22)
                   202.12  trifluoromethane (HFC-23)
                   202.13  trichlorotrifluoroethane (CFC-113)
                   202.14  dichlorotetrafluoroethane (CFC-114)
                   202.15  chloropentafluoroethane (CFC-115)
                   202.16  dichlorotrifluoroethane (HCFC-123)
                   202.17  2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124)
                   202.18  pentafluoroethane (HFC-125)
                   202.19  1,1,2,2-tetrafluoroethane (HFC-134)
                   202.20  tetrafluoroethane (HFC-134a)
                   202.21  dichlorofluoroethane (HCFC-141b)
                   202.22  chlorodifluoroethane (HCFC-142b)
                   202.23  1,1,1-trifluoroethane (HFC-143a)
                   202.24  1,1-difluoroethane (HFC-152a).
                   202.25  The  following  four  classes of perfluorocarbon
                           compounds:
                           a.  Cyclic,  branched,  or   linear,  completely
                               fluorinated alkanes.
                           b.  Cyclic,  branched,  or  linear,   completely
                               fluorinated ethers, with no unsaturations.
                           c.  Cyclic,   branched,  or  linear,  completely
                               fluorinated    tertiary   amines   with   no
                               unsaturations.
                           d.  Sulfur-containing  perfluorocarbons  with no
                               unsaturations and with sulfur bonds only  to
                               carbon and fluorine.

              203  LARGE  COMMERCIAL  BREAD  BAKERY:  Any  bakery producing
                   equal  to  or more than 100 pounds of VOC per  operating
                   day.
              204  LEAVEN:  To  raise  a dough by causing gas to thoroughly
                   permeate it through the  use of a chemical agent such as
                   baking powder or a fermentation-producing  agent such as
                   yeast.

              205  OVEN:   An  enclosed  compartment  supplied  with  heat,
                   typically  from the combustion of natural gas,  used  to
                   bake bread,  buns,  and  rolls.   This  does not include
                   proofing boxes.

              206  PROOFING  BOX:  A warm (typically about 100o  F),  humid
                   chamber where yeast-leavened dough is allowed to rise to
                   the volume desired for baking.

              207  VOLATILE ORGANIC  COMPOUNDS (VOC):  Compounds containing
                   at  least one atom of  carbon,  except  for  the  exempt
                   compounds listed in Section 202.

          300 STANDARDS

              301  EMISSION  CONTROL  REQUIREMENTS, NEW AND EXISTING OVENS:
                   All  ovens shall vent  emissions  to  a  control  system
                   meeting the following standards:
                   301.1   An  emissions  collection  system  shall capture
                           emissions from all oven stacks.
                   301.2   Collected  emissions  shall  be  vented   to  an
                           approved  emission  control  device which has  a
                           control efficiency of at least  95%  on  a  mass
                           basis,  as  determined pursuant to Section 502.1
                           of this rule.

          400 ADMINISTRATIVE REQUIREMENTS

              401  OPERATION AND MAINTENANCE  PLAN:  Any person required to
                   use an emissions control device  pursuant to Section 301
                   must submit an Operation and Maintenance  Plan  for  the
                   emissions  control  device  to the Air Pollution Control
                   Officer for approval.  The Plan  shall specify operation
                   and   maintenance  procedures  which  will   demonstrate
                   continuous  operation  of  the emissions control device,
                   pursuant to Section 301, during  periods  of  emissions-
                   producing operations.  The Plan shall also specify which
                   daily  records  must be kept to document these operation
                   and maintenance procedures.   These records shall comply
                   with the requirements of Sections  501.1 and 501.2.  The
                   Plan  shall  be  implemented upon approval  by  the  Air
                   Pollution Control Officer.

              402  PROCEDURE FOR PROCESSING OPERATION AND MAINTENANCE PLAN:
                   402.1   APPROVAL OF  PLAN:   The  Air  Pollution Control
                           Officer  shall determine whether  the  Operation
                           and Maintenance  Plan  meets the requirements of
                           Section 401 not later than 30 days after receipt
                           of the Plan, or within a  longer  period of time
                           agreed  upon by the parties.  The Air  Pollution
                           Control Officer  shall  approve an Operation and
                           Maintenance Plan unless it  fails to demonstrate
                           continuous  operation  of the emissions  control
                           device  during  periods of  emissions  producing
                           operations, according to the standards set forth
                           in Section 301, and/or it fails to specify which
                           daily   records,   in    accordance   with   the
                           requirements of Sections 501.1  and  501.3,  are
                           kept  to  document the operation and maintenance
                           procedures set forth in the Plan.
                   402.2   REVISION OF  PLAN:  If the Air Pollution Control
                           Officer  does  not   approve  an  Operation  and
                           Maintenance  Plan,  the   source  shall  receive
                           written notice of the deficiency, and shall have
                           an  additional  30 days from  the  date  of  the
                           notification of the  deficiency  to  correct and
                           resubmit  the  Operation  and Maintenance  Plan.
                           The  decision  of  the  Air  Pollution   Control
                           Officer regarding the resubmitted Operation  and
                           Maintenance  Plan  shall  be  final.  Failure to
                           correct  the  deficiency  in  an  Operation  and
                           Maintenance    Plan   upon   resubmittal   shall
                           constitute a violation  of  this  rule  that  is
                           subject to the penalties set forth in Health and
                           Safety Code section 42400 et seq.



              403  COMPLIANCE SCHEDULE:
                   403.1   For all bakeries subject to this rule with total
                           VOC  emissions  greater than or equal to 25 tons
                           per  year,  the  application  for  Authority  to
                           Construct an emission  control  device  must  be
                           submitted  pursuant  to Rule 201, General Permit
                           Requirements, with the Operation and Maintenance
                           Plan  by  August  7,  1994.   For  all  bakeries
                           subject to this rule with  total  VOC  emissions
                           less than 25 tons per year, the application  for
                           Authority   to  Construct  an  emission  control
                           device must be  submitted  pursuant to Rule 201,
                           General Permit Requirements,  with the Operation
                           and Maintenance Plan by November 7, 1995.
                   403.2   Operation  and Maintenance Plans  for  emissions
                           control devices installed as of June 7, 1994, if
                           not previously  submitted,  must be submitted by
                           December 7, 1994, and receive  approval  by  the
                           Air Pollution Control Officer.
                   403.3   Effective  May 31, 1995, all ovens, except those
                           exempt pursuant to Sections 110, 111, and 403.4,
                           shall be in compliance with this rule.
                   403.4   Effective June  7, 1996, all bakeries with total
                           VOC emissions of  less  than  25  tons  per year
                           shall be in compliance with this rule.

              404  CALCULATION  FOR  VOC  MASS  EMISSION  RATE  AND PERCENT
                   CONTROL EFFICIENCY:  The VOC mass emission rate shall be
                   calculated both upstream and downstream of the emissions
                   control   device   based  on  the  respective  VOC  mass
                   concentration  and  volumetric   flowrate,  pursuant  to
                   Section 502.1 and the following equation:

                                        M =  (Q)(C)(60 min/hr)

                               Where:   M  =  VOC mass  emission  rate,  in
                                        lb/hr.
                                        Q = the  volumetric flowrate of the
                                        exhaust stack, in scfm.
                                        C = the VOC  mass concentration, in
                                        lb/scf, as measured by
                                            EPA Method 25.

                   The percent control efficiency is calculated as follows:

                                        % CE = (MU - MD)  MU

                               Where:   CE = control efficiency.
                                        MU = the upstream VOC mass emission
                                        rate, in lb/hr.
                                        MD  =  the  downstream   VOC   mass
                                        emission rate, in lb/hr.

              405  CALCULATION FOR SMALL BAKERIES EXEMPTION:  VOC emissions
                   to determine exemption status pursuant to Section 110 of
                   this  rule  shall  be  calculated  using  the  following
                   equation:

                        VOC = (P)(0.95Y + 0.195T - 0.51S - 0.86ST + 1.90)

                               Where:   VOC = emissions in pounds per day
                                        P   = tons of product per day
                                        Y    =  initial baker's percent  of
                                        yeast
                                        T   = total  yeast  action  time in
                                        hours
                                        S   = final (spike) baker's percent
                                        of yeast
                                        ST  = spiking time in hours

          500 MONITORING AND RECORDS

              501  USAGE  RECORDS:   In  addition  to  any  existing permit
                   conditions  issued  pursuant  to  Rule  201, any  person
                   subject  to  this  rule shall comply with the  following
                   requirements:
                   501.1   CONTROL EQUIPMENT:  Any person using an emission
                           control system  pursuant  to  Section  300 shall
                           maintain   such   records  as  required  by  the
                           Operation and Maintenance Plan in Section 401 on
                           a daily basis.
                   501.2   LIST OF PRODUCT:  A  current  list  of  products
                           shall  be kept which includes, for each product,
                           the initial  baker's percent of yeast, the total
                           yeast action time,  the  final  (spike)  baker's
                           percent of yeast, and the spiking time.
                   501.3   DURATION  OF  RECORDS:   Such  records  shall be
                           maintained  on-site  for  a  continuous two-year
                           period and made available to the  Air  Pollution
                           Control Officer upon request.

              502  TEST METHODS
                   502.1   DETERMINATION  OF  CONTROL  EFFICIENCY:  Control
                           efficiency of the emissions control device shall
                           be determined in accordance with  EPA Method 18,
                           25,  25A,  EPA  Method  2  or  2C (whichever  is
                           applicable), and Section 404.