MBUAPCD RULE 425 USE OF CUTBACK ASPHALT                                    
LAST REVISED 08/25/93
                                    
                                    REGULATION  IV
                                     PROHIBITIONS
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          RULE 425    USE OF CUTBACK ASPHALT
          *컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴*


          (Adopted 1-25-79; Revised 3-18-81, 2-23-83 and 8-25-93).



                                      CONTENTS


          PART 1  GENERAL..............................................2
            
            1.1   Purpose..............................................2
                  
            1.2   Applicability........................................2
                  
            1.3   Exemptions...........................................2
                  
            1.4   Effective Dates......................................2
                  
            1.5   References...........................................2
                  

          PART 2  DEFINITIONS..........................................3
            
            2.1   Cutback Asphalt......................................3
                  
            2.2   Emulsified Asphalt...................................3
                  

          PART 3  REQUIREMENTS AND STANDARDS...........................3
            
            3.1   Prohibition of Manufacture and Sale..................3
                  
            3.2   Rapid Cure Asphalt...................................3
                  
            3.3   Medium Cure Asphalt..................................3
                  
            3.4   Slow Cure Asphalt....................................4
                  
            3.5   Emulsified Asphalt...................................4
                  

          PART 4  ADMINISTRATIVE REQUIREMENTS..........................4
            
            4.1   Production and Sales.................................4
                  
            4.2   Daily High Temperature...............................4
                  

          PART 5    TEST METHODS.......................................5
                    
            5.1   Distillate Content of Slow Cure Asphalt..............5
                  
            5.2   Petroleum Solvent Content of Emulsified Asphalt......5
              





          082593                                               Rule 425:  1
                                    REGULATION  IV
                                     PROHIBITIONS
          PART 1  GENERAL


          1.1   Purpose

            The purpose of this Rule is to limit the emissions of vapors of
            organic compounds from the use of cutback and emulsified
            asphalts.


          1.2   Applicability

            The provisions of this Rule apply to the manufacture, sale,
            mixing, storage, use, and application of cutback and emulsified
            asphalts.


          1.3   Exemptions

            The requirements of Section 3.3 shall not apply to the
            following uses of medium cure cutback asphalts:

            1.3.1   as a penetrating prime coat for aggregate bases prior
                    to paving;

            1.3.2   for the manufacture of asphalt for long-period storage
                    or stockpiling of patching mixes used in pavement
                    maintenance but not for general paving; or

            1.3.3   when the forecast of the high temperature for the 24-
                    hour period following application is below 10 C (50
                    F), provided that the records of the high temperature
                    are maintained, as specified in Section 4.2.


          1.4   Effective Dates

            This Rule has been in effect since January 25, 1979.  The Rule
            in its present form is effective August 25, 1993.


          1.5   References

            The requirements of this Rule arise from the provisions of the
            California Clean Air Act and amendments (Health and Safety Code
            Section 40910 et seq.) and the federal Clean Air Act and
            amendments (42 U.S.C. Section 7401 et seq.)

          PART 2  DEFINITIONS

          2.1   Cutback Asphalt

            Asphalt cement that has been cut back or blended with a diluent
            of petroleum solvents.  Types of cutback asphalt are defined by
            American Society of Testing and Materials (ASTM) specifications
            as follows:

              Slow cure type    :  ASTM D 2026
              Medium cure type  :  ASTM D 2027
              Rapid cure type   :  ASTM D 2028


          2.2   Emulsified Asphalt

            An emulsion of asphalt cement and water that contains a small
            amount of emulsifying agent.  An inverted emulsified asphalt
            shall be considered a cutback asphalt if the liquid asphalt
            phase was a cutback asphalt.


          PART 3  REQUIREMENTS AND STANDARDS

          3.1   Prohibition of Manufacture and Sale

            No person shall manufacture, offer for sale or sell a liquid
            asphalt or emulsified asphalt product if the use of such
            product at any physical location within the District is
            prohibited by any provisions of this Rule.  The records of
            manufacture, sale, and destination of asphalts shall be
            maintained according to Section 4.1.

          3.2   Rapid Cure Asphalt

            The use of rapid cure cutback asphalts at any physical location
            within the District is prohibited.

          3.3   Medium Cure Asphalt

            All applications or uses of medium cure cutback asphalts are
            prohibited during the months of April, May, June, July, August,
            September and October, except as specifically exempted in
            Section 1.3.

          3.4   Slow Cure Asphalt

            Slow cure cutback asphalt shall contain no more than 0.5
            percent by volume of total distillate to 260 C (500 F) as
            determined by ASTM Method D 402.

          3.5   Emulsified Asphalt

            No person shall use any emulsified asphalt containing petroleum
            solvents in excess of three (3) percent by volume in paving
            material or in paving and maintenance operations.  The
            petroleum solvent content shall be determined by ASTM Method D
            244-88.

          PART 4  ADMINISTRATIVE REQUIREMENTS

            The following records shall be maintained for a period of two
            (2) years and shall be made available to the District upon
            request.

          4.1   Production and Sales

            Any person who manufactures liquid asphalts or emulsified
            asphalts which contain organic solvents shall maintain records
            showing the following:

            4.1.1   the types and amounts of asphalts produced, including
                    the percentages of petroleum solvent diluent used in
                    each type;

            4.1.2   dates of sale or use;

            4.1.3   name of the purchaser or user; and

            4.1.4   the intended destination of the products.

          4.2   Daily High Temperature

            Any person using medium cure cutback asphalt in accordance with
            Section 1.3.3, shall keep records of the official National
            Weather Service Forecast for the high temperature for the day
            following the application of the asphalt.

          PART 5    TEST METHODS

          5.1   Distillate Content of Slow Cure Asphalt

            The total distillate content of cutback asphalt shall be
            determined using ASTM Method D 402.

          5.2   Petroleum Solvent Content of Emulsified Asphalt

            The petroleum solvent content of emulsified asphalt shall be
            determined using ASTM Method D 244-88.

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          082593                                               Rule 425:  2