SCAQMD RULE 401 VISIBLE EMISSIONS
LAST REVISED 04/07/89



(Adopted Feb. 4, 1977)(Amended Apr. 1, 1977)(Amended Aug. 4, 1978)
(Amended Sept. 7, 1979)(Amended Feb. 1, 1980)(Amended July 11, 1980)
(Amended Oct. 15, 1982)(Amended Mar. 2, 1984)(Amended Feb. 5, 1988)
(Amended April 7, 1989)


          RULE 401.    VISIBLE EMISSIONS
          
          (a)  Definitions
               For  the  purpose  of this rule, the following definitions
               shall apply:
               (1)  Kerosene Fuel is  petroleum  distillate  fuel meeting
                    diesel grade 1-D per ASTM D975-78, fuel oil grade No.
                    1  per  ASTM  D396-79,  or  kerosene  by conventional
                    commericial specifications.
               (2)  An  Approved  Smoke-reducing  Fuel  Additive   is  as
                    approved by the Executive Officer.
               (3)  A Synthetic Engine Lubricating Oil is as approved  by
                    the Executive Officer.

          (b)  Requirements
               (1)  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
                         No. 1 on the  Ringelmann  Chart, as published by
                         the United States Bureau of Mines; or
                    (B)  Of such opacity as to obscure an observer's view
                         to a degree equal to or greater  than does smoke
                         described  in  subparagraph  (b)(1)(A)  of  this
                         rule.
               (2)  Not  withstanding  the  provisions  of   subparagraph
                    (b)(1)  of  this  rule,  a person shall not discharge
                    into  the  atmosphere  from  equipment  for  melting,
                    heating, or holding asphalt or coal tar pitch for on-
                    site roof construction or repair; 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
                         No. 2 on the Ringelmann  Chart,  as published by
                         the United States Bureau of Mines; or


                    (B)  Of  such an opacity as to  obscure  an
                         observer's view  to a degree equal to or greater
                         than  does  smoke  described   in   subparagraph
                         (b)(2)(A) of this rule.
               (3)  Notwithstanding the provisions of subparagraph (b)(1)
                    of this rule, a person shall not discharge  into  the
                    atmosphere   from  any  diesel  pile-driving  hammer,
                    operating exclusively using kerosene fuel, containing
                    approved smoke-reducing  fuel  additives, as the sole
                    fuel,  and  using  only synthetic engine  lubrication
                    oil,  or  other  method  deemed  technologically  and
                    economically feasible  by  the Executive Officer, any
                    air contaminant for a period  or  periods aggregating
                    more than four minutes during the driving of a single
                    pile which is:
                    (A)  As  dark or darker in shade as  that  designated
                         No. 2  on  the Ringelmann Chart, as published by
                         the United States Bureau of Mines; or
                    (B)  Of such opacity as to obscure an observer's view
                         to a degree  equal to or greater than does smoke
                         described  in  subparagraph  (b)(3)(A)  of  this
                         rule.

          (c)  Exemptions
               (1)  The provisions of this rule shall not apply to the
                    following operations:
                    (A)  Asphalt pavement heater operations;
                    (B)  Abrasive blasting operations;
                    (C)  The use of visible emission generating equipment
                         in training sessions  conducted  by governmental
                         agencies  necessary  for certifying  persons  to
                         evaluate visible emissions  for  compliance with
                         this  rule  and with the California  Health  and
                         Safety Code, Section 41704 (l).
                    (D)  Visible  emissions   from  ships  which  perform
                         emergency boiler shutdowns,  tests  required  by
                         governmental  agencies  or  maneuvers for safety
                         purposes;
                    (E)  Agricultural operations.