SISAPCD RULE 4.1 VISIBLE EMISSIONS          
LAST REVISED 01/01/89          
          
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          RULE 4.1  Visible Emissions
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          Except  as  provided  in  these  regulations,  a person shall not
          discharge into the atmosphere from any single source  of emission
          whatsoever,   any   air  contaminant  for  a  period  or  periods
          aggregating more than three minutes in any one hour which is:

          A. As dark or darker  in  shade as that designated as No.2 on the
             Ringelmann chart as published  by  the United States Bureau of
             Mines.

          B. Of such opacity as to obscure an observer's  view  to a degree
             equal to or greater than does smoke described in subsection A.
             of this rule.

          C. The provisions of Rule 4.1.A. and Rule 4.1.B. shall  not apply
             to:

             1. Fires set pursuant to Rule 4.3.

             2. Agricultural  burning  for  which a permit has been granted
                pursuant to Regulation VII.

             3. Use  of  any  aircraft  to  distribute   seed,  fertilizer,
                insecticide, or other agricultural aids over  lands devoted
                to the growing of crops or raising of fowl or animals.

             4. The  use of orchard and citrus grove heaters which  are  in
                compliance with the requirements set forth in Rule 4.11.

             5. Fires set or permitted by any public officer in the perfor-
                mance  of  his/her  official  duty  for  the improvement of
                watershed, range, or pasture.

             6. Agricultural operations necessary for the  growing of crops
                or raising of fowl or animals.

             7. The  use  of  other  equipment  in  agricultural operations
                necessary for the growing of crops or  raising  of  fowl or
                animals.

             8. The   use  of  visible  emission  generating  equipment  in
                training   sessions   conducted  by  governmental  agencies
                necessary  for  certifying   persons  to  evaluate  visible
                emissions.

             9. Smoke emissions from teepee burners operating in compliance
                with Section 4438 of the Public  Resources  Code during the
                disposal of forestry and agricultural residues  or forestry
                and  agricultural residues with supplementary fossil  fuels
                when such  emissions result from the startup or shutdown of
                the combustion  process or from the malfunction of emission
                control equipment.  This exception shall not apply to emis-
                sions which exceed a  period or periods of time aggregating
                more than 30 minutes in  any 24-hour period. This exception
                shall not apply to emissions  which result from the failure
                to operate and maintain in good  working order any emission
                control equipment.

            10. Smoke emissions from burners used  to  produce  energy  and
                fired   by   forestry   and   agricultural   residues  with
                supplementary fossil fuels when such emissions  result from
                startup or shutdown of the combustion process or  from  the
                malfunction  of emission control equipment.  This exception
                shall not apply  to  emissions  which  exceed  a  period or
                periods  of  time  aggregating more than 30 minutes in  any
                24-hour period, or which result from the failure to operate
                and maintain in good  working  order  any  emission control
                equipment.
            11. Emissions  from  methanol  fuel manufacturing plants  which
                manufacture  not more than 2,000,000  gallons  of  methanol
                fuel per day from  wood agricultural waste, natural gas, or
                coke (exclusive of petroleum  coke).  As used in this rule,
                "manufacturing plant" shall include  all  necessary support
                systems, including field operations equipment  that provide
                feed  stock.   However, this exception shall apply  to  not
                more than one such methanol fuel manufacturing plant in the
                Northeast Plateau  Air  Basin  and each such plant shall be
                located  in  an  area designated as  an  "attainment  area"
                pursuant to the Clean  Air Act (42 U.S.C. 7401 et seq.) and
                shall  meet  all  applicable   standards  required  by  the
                district board. This exception shall  remain in effect with
                respect to such a plant until five years after construction
                of  the  plant  and  shall  have no force and  effect  with
                respect to such a plant on and after such date.

          D. When the presence of uncombined  water  is the only reason for
             the  failure  of  an  emission  to meet the visible  emissions
             limitation (Rule 4.1), that rule  shall  not apply. The burden
             of proof which establishes the application  of  this exception
             shall   be   upon  the  person  seeking  to  come  within  its
             provisions.

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