SACAQMD RULE 903 MERCURY          
LAST REVISED 12/06/78          

          SACRAMENTO METROPOLITAN AQMD                RULES AND REGULATIONS
                                         RULE 903 MERCURY
                                          Adopted 6-2-75
                                        (Amended 12-6-78)
                                              INDEX

          100 GENERAL
              101  PURPOSE

          200 DEFINITIONS
              201  CELL ROOM
              202  CONDENSER STACK GASES
              203  DENUDER
              204  END BOX
              205  END BOX VENTILATION SYSTEM
              206  HYDROGEN GAS STREAM
              207  MERCURY
              208  MERCURY CHLOR-ALKALI CELL
              209  MERCURY CHLOR-ALKALI ELECTROLYZER
              210  MERCURY ORE
              211  MERCURY ORE PROCESSING FACILITY
              212  SLUDGE
              213  SLUDGE DRYER

          300 STANDARDS
              301  MERCURY ORE PROCESSING
              302  SLUDGE INCINERATION PLANTS
              303  OTHER REQUIREMENTS

          400 ADMINISTRATIVE REQUIREMENTS
              401  TESTING
              402  REPORTING

          500 MONITORING AND RECORDS
              501  MERCURY ORE PROCESSING
              502  MERCURY  CHLOR-ALKALI  PLANTS  -  HYDROGEN  AND  END BOX
                   VENTILATION GAS STREAMS
              503  MERCURY  CHLOR-ALKALI  PLANTS  -  CELL  ROOM VENTILATION
                   SYSTEM
              504  SLUDGE INCINERATION AND DRYING PLANTS
              505  EMISSION MONITORING
          
          100 GENERAL

              101  PURPOSE:   To  limit  the  emission  of mercury  to  the
                   atmosphere.

          200 DEFINITIONS

              201  CELL ROOM:  A structure(s) housing one  or  more mercury
                   electrolytic chlor-alkali cells.

              202  CONDENSER  STACK  GASES:   The gaseous effluent  evolved
                   from the stack or processes  utilizing  heat  to extract
                   mercury metal from mercury ore.

              203  DENUDER:   A  horizontal or vertical container which  is
                   part of mercury  chlor-alkali  cell and  in  which water
                   and alkali metal amalgam are converted  to  alkali metal
                   hydroxide,    mercury,    and    hydrogen   gas   in   a
                   short-circuited, electrolytic reaction.

              204  END BOX  A container(s) located on one or both ends of a
                   mercury  chlor-alkali electrolyzer  which  serves  as  a
                   connection between the electrolyzer and denuder for rich
                   and stripped amalgam.

              205  END BOX VENTILATION  SYSTEM:  A ventilation system which
                   collects  mercury  emissions   from  the  endboxes,  the
                   mercury pump sumps, and their water collection system.

              206  HYDROGEN GAS STREAM:  A hydrogen  stream  formed  in the
                   chlor-alkali cell denuder.

              207  MERCURY:   The element mercury, excluding any associated
                   elements, and including mercury in particulates, vapors,
                   aerosols, and compounds.

              208  MERCURY CHLOR-ALKALI  CELL:  A device which is basically
                   composed  of  an  electrolyzer  section  and  a  denuder
                   (decomposer) section  and  utilizes  mercury  to produce
                   chlorine gas, hydrogen gas, and alkali metal hydroxide.

              209  MERCURY   CHLOR-ALKALI  ELECTROLYZER:   An  electrolytic
                   device which  is part of a mercury chlor-alkali cell and
                   utilizes a flowing  mercury  cathode to produce chlorine
                   gas and alkali metal amalgam.

              210  MERCURY  ORE:   A  mineral mined  specifically  for  its
                   mercury content.

              211  MERCURY ORE PROCESSING  FACILITY:  A facility processing
                   mercury ore to obtain mercury.

              212  SLUDGE:   Sludge produced  by  a  treatment  plant  that
                   processes municipal or industrial waste waters.

              213  SLUDGE DRYER:   A  device  used  to  reduce the moisture
                   content of sludge by heating to temperatures  above 65oC
                   (ca. 150oF) directly with combustion gases.

          300 STANDARDS

              301  MERCURY  ORE  PROCESSING:   Emissions  to the atmosphere
                   from those stationary sources which process  mercury ore
                   to   recover   mercury   and  those  which  use  mercury
                   chlor-alkali cells to produce  chlorine  gas  and alkali
                   metal hydroxide shall not exceed 2,300 grams of  mercury
                   per 24-hour period.

              302  SLUDGE INCINERATION PLANTS:  Emissions to the atmosphere
                   from  sludge  incineration plants, sludge drying plants,
                   or  a  combination  of  these  that  process  wastewater
                   treatment  plant sludges shall not exceed 3,200 grams of
                   mercury per 24-hour period.
              303  OTHER REQUIREMENTS:   If  any  other rule in these Rules
                   and  Regulations is more restrictive,  that  rule  shall
                   apply.

          400 ADMINISTRATIVE PROCEDURES

              401  TESTING:    Unless  a  waiver  of  emission  testing  is
                   obtained under  Rule  901,  Section  403,  or  has  been
                   previously  granted  under  40  CFR 61.13, each owner or
                   operator shall test emissions:
                   401.1   Within  90 days of the effective  date  of  this
                           rule; and
                   401.2   Within 90  days  of startup in the case of a new
                           source.

              402  REPORTING:  The Air Pollution  Control  Officer shall be
                   notified at least 30 days prior to an emission  test, so
                   that  he  may  at  his  option  observe the test. At his
                   option, the Air Pollution Control  Officer  may  conduct
                   the required test.

          500 MONITORING AND RECORDS

              501  MERCURY ORE PROCESSING FACILITY:
                   501.1   Samples  shall  be  taken over such a period  or
                           periods as are necessary to accurately determine
                           the maximum emissions  which  will occur in a 24
                           hour period. No changes in the  operation  shall
                           be   made   which   would  potentially  increase
                           emissions  above that  determined  by  the  most
                           recent source  test until the new emission level
                           has  been  estimated  by  calculation   and  the
                           results reported  to  the  Air Pollution Control
                           Officer.
                   501.2   All  samples  shall  be  analyzed,  and  mercury
                           emissions  shall be determined  within  30  days
                           after the source  test. Each determination shall
                           be reported to the Air Pollution Control Officer
                           by  a registered letter  dispatched  before  the
                           close  of  the  next business day following such
                           determination.
                   501.3   Records of emission  test results and other data
                           needed  to determine total  emissions  shall  be
                           retained  at  the  source and made available for
                           inspection by the Air  Pollution Control Officer
                           for a minimum of two years.

              502  MERCURY  CHLOR-ALKALI  PLANTS  - HYDROGEN  AND  END  BOX
                   VENTILATION GAS STREAMS:
                   502.1   Samples shall be taken over  such  a  period  or
                           periods as are necessary to accurately determine
                           the  maximum  emissions which will occur in a 24
                           hour period.  No  changes in the operation shall
                           be  made,  which  would   potentially   increase
                           emissions  above  that  determined  by  the most
                           recent  source test, until the new emission  has
                           been estimated  by  calculation  and the results
                           reported to the Air Pollution Control Officer.
                   502.2   All  samples  shall  be  analyzed  and   mercury
                           emissions  shall  be  determined  within 30 days
                           after    the    source   test.    All   of   the
                           determinations shall  be  reported  to  the  Air
                           Pollution Control Officer by a registered letter
                           dispatched before the close of the next business
                           day following such determination.
                   502.3   Records  of emission test results and other data
                           needed to  determine  total  emissions  shall be
                           retained  at  the source and made available  for
                           inspection by the  Air Pollution Control Officer
                           for a minimum of two years.

              503  MERCURY  CHLOR-ALKALI PLANTS  -  CELL  ROOM  VENTILATION
                   SYSTEM:
                   503.1   Stationary  sources  using  mercury chlor-alkali
                           cells may test cell room emissions in accordance
                           with  Section  401 of this rule  or  demonstrate
                           compliance  with   Section   503.2   and  assume
                           ventilation  emissions  of  1,300  grams/day  of
                           mercury.
                   503.2   An  owner  or  operator  may  carry out approved
                           design, maintenance, and housekeeping practices.
                           A  list  of  approved  design,  maintenance  and
                           housekeeping practices may be obtained  from the
                           Air Pollution Control Officer.

              504  SLUDGE INCINERATION AND DRYING PLANTS:
                   504.1   Method  101  of  Rule  901 Section 402 or sludge
                           sampling in Section 504.6  shall be used to test
                           the emissions as follows:
                           a.  The test shall be performed  within  90 days
                               of  the  effective date of these regulations
                               in the case  of  an existing source or a new
                               source  which has an  initial  startup  date
                               preceding the effective date.
                           b.  The test  shall  be performed within 90 days
                               of startup in the case of a new source which
                               did  not  have  an  initial   startup   date
                               preceding the effective date.
                   504.2   Samples  shall  be  taken  over such a period or
                           periods as are necessary to determine accurately
                           the maximum emissions which  will  occur in a 24
                           hour  period.  No changes shall be made  in  the
                           operation  which   would   potentially  increase
                           emissions above the level determined by the most
                           recent stack test until the  new  emission level
                           has  been  estimated  by  calculation  and   the
                           results  reported  to  the Air Pollution Control
                           Officer.
                   504.3   All  samples  shall  be  analyzed,  and  mercury
                           emissions  shall be determined  within  30  days
                           after the stack  test.  Each determination shall
                           be reported to the Air Pollution Control Officer
                           by  a  registered letter dispatched  before  the
                           close of  the  next  business day following such
                           determination.
                   504.4   Records of emission test  results and other data
                           needed  to  determine total emissions  shall  be
                           retained  at  the   source  and  shall  be  made
                           available for inspection  by  the  Air Pollution
                           Control Officer for a minimum of two years.
                   504.5   As   an   alternative  means  for  demonstrating
                           compliance with Section 302 an owner or operator
                           may use Method  105  of  Appendix  B  40  CFR 61
                           (April 6, 1973) and the procedures specified  in
                           this section.
                           a.  Sludge shall be sampled according to Section
                               504.6b;  sludge  charging rate for the plant
                               shall be determined   according  to  Section
                               504.5c   and   sludge   analysis   shall  be
                               performed according to Section 504.5d.
                           b.  The   sludge   shall   be   sampled,   after
                               dewatering   and   before   incineration  or
                               drying,  at  a  location  that  provides   a
                               representative  sample of the sludge that is
                               charged to the incinerator  or  dryer. Eight
                               consecutive  grab samples shall be  obtained
                               at intervals of  between  45  and 60 minutes
                               and  thoroughly mixed into one sample.  Each
                               of the  eight  grab  samples  shall  have  a
                               volume of at least 200 ml. but not more that
                               400  ml.  A total of three composite samples
                               shall be obtained within an operating period
                               of  24 hours.  When  the  24-hour  operating
                               period is not continuous, the total sampling
                               period  shall  not exceed 72 hours after the
                               first grab sample is obtained. Samples shall
                               not be exposed to  any  condition  that  may
                               result in mercury contamination or loss.
                           c.  The    maximum    24-hour    period   sludge
                               incineration   or   drying  rate  shall   be
                               determined by use of a flow rate measurement
                               device that can measure  the  mass  rate  of
                               sludge  charged  to the incinerator or dryer
                               with an accuracy of  plus,  or minus 5% over
                               its   operating  range.  Other  methods   of
                               measuring  sludge mass charging rates may be
                               used if they have received prior approval by
                               the Air Pollution Control Officer.
                           d.  The handling,  preparation,  and analysis of
                               sludge   samples   shall   be   accomplished
                               according the Method 105, Appendix  B 40 CFR
                               61 (April 6, 1973).
                           e.  The mercury emissions shall be determined by
                               use of the following equation:
                                               EHg  =  1 X 10-3  CQ
                                   where:
                                   EHg  = mercury emissions, g/day
                                   
                                   C    =  mercury  concentration of sludge
                                        on a dry solids basis ug/g (ppm).
                                   
                                   Q    = sludge charging rate; kg/day
                           
                           f.  No changes in the operation of a plant shall
                               be  made  after  a  sludge   test  has  been
                               conducted which would  potentially  increase
                               emissions above the level determined  by the
                               most  recent  sludge  test,  until  the  new
                               emissions   level   has  been  estimated  by
                               calculation and the results  reported to the
                               Air Pollution Control Officer.
                           g.  All  sludge  samples  shall be analyzed  for
                               mercury content within  30  days  after  the
                               sludge    sample    is    collected.    Each
                               determination  shall  be reported to the Air
                               Pollution Control Officer  by  a  registered
                               letter  dispatched before the close  of  the
                               next    business    day    following    such
                               determination.
                           h.  Records of  sludge  sampling,  charging rate
                               determination  and  other  data  needed   to
                               determine   mercury  content  of  wastewater
                               treatment plant sludges shall be retained at
                               the source and made available for inspection
                               by the Air Pollution  Control  Officer for a
                               minimum of two years.

              505  EMISSION MONITORING:  Wastewater treatment plant  sludge
                   incineration   and  drying  plants,  for  which  mercury
                   emissions exceed 1,600 g/day, demonstrated by any of the
                   methods specified  in  this  rule, shall monitor mercury
                   emissions at intervals of at least  once per year by any
                   of the methods specified in this rule.