PLAAPCD RULE 902 AIRBORNE CHROMIUM CONTROL MEASURE.,ETC
LAST REVISED 04/13/95          

                               Adopted 07-17-89
                              (Revised 04-13-95)


          PART 1.0  GENERAL

          1.1  Purpose

               To  comply  with  Health  and  Safety  Code Section 39666 by
               reducing hexavalent chromium emissions from plating and acid
               anodizing operations.

          1.2  Applicability

               This  regulation shall apply to any new or  existing  chrome
               plating  or  chromic acid anodizing operation located in the
               Sacramento Valley, Mountain Counties or Lake Tahoe Air Basin
               portion of Placer County.

          PART 2.0  DEFINITIONS  - For the purpose of this section the fol-
          lowing definitions shall apply:

               A.   Ampere-Hours:   The  integral of electrical current ap-
                    plied to a plating tank (amperes) over a period of time
                    (hours).

               B.   Anti-Mist Additive:  A chemical which reduces the emis-
                    sion rate from the tank when added to and maintained in
                    the plating tank.

               C.   Chrome:  Metallic chrome.

               D.   Chrome  Plating:   Either  hard  or  decorative  chrome
                    plating.

               E.   Chromic Acid:  An aqueous solution of chromium trioxide
                    (CrO3)  or  a commercial  solution  containing  chromic
                    acid,  dichromic   acid  (H2CrO7)  or  trichromic  acid
                    (H2Cr3O10).

               F.   Chromic Acid Anodizing:   The  electrolytic  process by
                    which a metal surface is converted to an oxide  surface
                    coating in a solution containing chromic acid.

               G.   Chromium:  Hexavalent chromium.

               H.   Control  Equipment:  Any device which reduces emissions
                    from the emissions collection system.
               I.   Decorative   Chrome  Plating:   The  process  of  which
                    chromium is electrodeposited from a solution containing
                    compounds of chromium  onto  an  object  resulting in a
                    chrome layer 1 micron (0.04 mil.) thick or less.

               J.   Emission Factor:  The mass of chromium emitted during a
                    test  conducted in the emissions collection  system  in
                    accordance  with  ARB  Test  Method  425 divided by the
                    ampere-hours consumed by the tanks in  the tested emis-
                    sions  collection  system,  expressed  as the  mass  of
                    chromium emitted per ampere-hour of electrical  current
                    consumed.
               K.   Emissions  Collection  System:   A  device or apparatus
                    used to gather chromium emissions from the surface of a
                    chrome plating or chromic acid anodizing tank or tanks.

               L.   Facility:  A business or businesses engaged  in  chrome
                    plating  or  chromic acid anodizing which are owned  or
                    operated by the  same person or persons and are located
                    on the same parcel or on contiguous parcels.

               M.   Facility-wide Emissions  from  Hard  Chrome  Plating or
                    Chromic  Acid Anodizing:  The total emissions from  all
                    hard chrome  plating  or  chromic acid anodizing at the
                    facility  over  a calendar year.   Emissions  shall  be
                    calculated as the  sum  of emissions from the emissions
                    collection system at the  facility.  The emissions from
                    an emissions collection system  shall  be calculated by
                    multiplying  the  emission  factor  for that  emissions
                    collection  system by the sum of ampere-hours  consumed
                    during that year  for  all  of  the tanks served by the
                    emissions collection system.

               N.   Hard Chrome Plating:  The process  by which chromium is
                    electrodeposited  from a solution containing  compounds
                    of chromium onto an  object resulting in a chrome layer
                    thicker than 1 micron (0.04 mil.).

               O.   Plating Tank:  Any container used to hold a chromium or
                    chromic  acid  solution  for  the  purposes  of  chrome
                    plating or chromic acid anodizing.

               P.   Uncontrolled Chromium  Emissions  from  the Hard Chrome
                    Plating  or  Chromic  Acid  Anodizing  Facility:    The
                    chromium   emissions   from  the  emissions  collection
                    systems at the facility  calculated  as  if  no control
                    equipment  is  in  use.  For the purpose of determining
                    compliance with this  rule  the  uncontrolled  chromium
                    emissions shall be calculated using an emission  factor
                    based  on  tests  conducted in accordance with ARB test
                    method 425 or 14 mg/ampere-hour whichever is less.

          PART 3.0  STANDARDS

          3.1  Requirements for Decorative Chrome Plating Facilities

               A.   No person shall operate  a  decorative  chrome  plating
                    tank  unless  an  anti-mist  additive  is  continuously
                    maintained in the plating tank, or control equipment is
                    installed   and   used  in  a  manner  which  has  been
                    demonstrated  to  and  approved  by  the  district  air
                    pollution   control  officer   as   reducing   chromium
                    emissions by  95  percent  or more relative to chromium
                    emissions when an anti-mist  additive is not maintained
                    or control equipment is not installed and used.

          3.2  Requirements  for  Hard  Chrome  Plating  and  Chromic  Acid
               Anodizing Facilities

               A.   The owners or operators of all  hard chrome plating and
                    chromic  acid  anodizing facilities  shall  maintain  a
                    continuous  record  of  current  integrated  over  time
                    (ampere-hours)   for   all   plating   tanks  for  each
                    collection  system used in the hard chrome  plating  or
                    chromic acid anodizing operations and shall, within six
                    months after district adoption of regulations, July 17,
                    1989, enacting  this  control  measure and upon request
                    thereafter, submit the information  to the district air
                    pollution control officer.

               B.   No person shall operate a plating tank  for hard chrome
                    plating or chromic acid anodizing unless  the  tank has
                    an emissions collection system.
               C.   No  person  shall  operate  a  hard  chrome  plating or
                    chromic acid anodizing tank unless:

                    1.   The chromium emissions from the emissions  collec-
                         tion  system  serving  the  plating tank have been
                         reduced by 95 percent or more  of the uncontrolled
                         chromium emissions or;

                    2.   The   chromium   emissions   from  the   emissions
                         collection system serving the  plating  tank  have
                         been reduced to less than 0.15 milligrams (mg)  of
                         chromium  per  ampere-hour  of  electrical  charge
                         applied to the plating tank.

               D.   No  person shall operate a hard chrome plating tank  or
                    chromic  acid anodizing tank at a facility if facility-
                    wide chromium  emissions  from  hard  chrome plating or
                    chromic acid anodizing are greater than  2  pounds  per
                    year but less than 10 pounds per year, unless:

                    1.   The   chromium   emissions   from   the  emissions
                         collection systems serving the plating  tanks have
                         been  reduced  by  at  least  99  percent  of  the
                         uncontrolled  chromium  emissions  from  the  hard
                         chrome plating or chromic acid anodizing facility,
                         or;

                    2.   The   chromium   emissions   from   the  emissions
                         collection systems are reduced to less  than  0.03
                         mg  of  chromium  per  ampere-hour  of  electrical
                         charge applied to the tanks.

               E.   No  person  shall  operate  a  hard  chrome plating  or
                    chromic acid anodizing tank at a facility  if facility-
                    wide  chromium  emissions  from hard chrome plating  or
                    chromic  acid  anodizing  are 10  pounds  per  year  or
                    greater, unless:

                    1.   The   chromium  emissions   from   the   emissions
                         collection  systems serving the plating tanks have
                         been reduced  by  at  least  99.8  percent  of the
                         uncontrolled  chromium  emissions  from  the  hard
                         chrome plating or chromic acid anodizing facility,
                         or;

                    2.   The   chromium   emissions   from   the  emissions
                         collection systems are reduced to less  than 0.006
                         mg  of chromium per ampere-hour electrical  charge
                         applied to the tanks.

          PART 4.0  ADMINISTRATIVE REQUIREMENTS

          4.1  Compliance Schedule - Decorative Chrome Plating Facilities

               A.   No later than  six  months  after  district adoption of
                    regulations  enacting  this control measure,  July  17,
                    1989, the owners or operators  of  existing  decorative
                    chrome plating tanks must comply with the provisions of
                    Section 3.1.A.

          4.2  Compliance  Schedule - Hard Chrome Plating and Chromic  Acid
               Anodizing Facilities

               A.   No later  than twelve months after district adoption of
                    regulations  enacting  this  control  measure, July 17,
                    1989, the owner or operator of a hard chrome plating or
                    chromic  acid  anodizing facility subject  to  sections
                    3.2.C  or  3.2.E  shall  submit  to  the  district  air
                    pollution  control  officer   an   application  for  an
                    Authority to Construct the equipment  necessary to meet
                    the requirements of 3.2.B and 3.2.C and  no  later than
                    eighteen  months after district adoption of regulations
                    on July 17,  1989,  enacting  this control measure, the
                    facility shall be in compliance  with  the requirements
                    of 3.2.B and 3.2.C.
               B.   No  later than eighteen months after district  adoption
                    of regulations  enacting  this control measure July 17,
                    1989, the owner or operator of a hard chrome plating or
                    chromic acid anodizing facility  subject to 3.2.D shall
                    submit to the district air pollution control officer an
                    application for an Authority to Construct the equipment
                    necessary to meet the requirements  of  3.2.B and 3.2.D
                    and  no  later  than twenty-four months after  district
                    adoption July 17,  1989,  of  regulations enacting this
                    control  measure the facility shall  be  in  compliance
                    with the requirements of 3.2.B and 3.2.D.

               C.   No later than  thirty months after district adoption of
                    regulations  July 17, 1989,  enacting this control
                    measure, the owner or operator of a hard chrome plating
                    or chromic acid anodizing  facility  subject to 3.2.E
                    shall  submit to the  district  air pollution control
                    officer an application for an Authority to Construct
                    the equipment  necessary to  meet  the requirements of
                    3.2.E  and no later than forty-eight  months  after
                    district adoption of regulations  July 17, 1989,
                    enacting this control measure the facility shall be in
                    compliance with the requirements of 3.2.E.