SLOAPCD RULE 420 CUTBACK ASPHALT PAVING MATERIALS LAST REVISED 06/18/79 RULE 420. CUTBACK ASPHALT PAVING MATERIALS (Adopted 6/18/79) A. Compliance Dates 1. After July 1, 1979, no person shall cause or allow the use or application of rapid cure cutback asphalt for highway or street or maintenance, nor manufacture, sell or offer to sell cutback asphalt for such use or application. 2. After July 1, 1980, no person shall cause or allow the use or application of cutback asphalt for highway or street paving or maintenance, nor manufacture, sell, or offer for sale cutback for use or application except as specified below: a. Where the cutback asphalt is to be used solely as a penetrating prime coat; b. Where the National Weather Service official forecast of the high temperature for the immediate vicinity of the asphalt application for the 24-hour period following application is below 50oF (10oC); c. Where the cutback asphalt is to be used for highway or street paving or maintenance purposes and the location of such use is a minimum of 25 miles from the nearest available commercial plant which produces and offers for sale plant mixed surfacing material. 3. In non-attainment areas after January 1, 1982, no person shall cause or allow the use or application of an emulsified asphalt containing petroleum solvents (diluents) in excess of three percent by volume or cutback asphalt for highway or street paving or maintenance. These provisions do not apply to cutback asphalt manufactured in this District for shipment and use outside this District. If by January 1, 1981, there are no suitable emulsified or slow cure asphalt alternatives available at a cost comparable to existing materials as approved by the APCD for uses listed in the exception under A.2, then the January 1, 1982 date will be extended on a year-to-year basis until such materials are available. 4. After January 1, 1982, road oils used for highway or street paving or maintenance applications shall contain no more than 5.0% of organic compounds which boil at less than 500oF as determined by ASTM D402. B. Definitions 1. "Asphalt" means oil asphalt or a homogenous mixture of refined liquid and solid asphalts suitable for use in the manufacture of asphalt concrete. 2. "Cutback asphalt" means paving grade asphalts liquefied with petroleum distillate and as further defined by American Society for Testing and Materials (ASTM) specifications as follows: Rapid CureType: ASTM D2028 Medium Cure Type: ASTM D2027 3. "Dust palliative" means any light application of liquefied asphalt (cutback or emulsified asphalt) for the express purpose of controlling loose dust. 4. "Emulsified asphalt" means any asphalt liquefied with water containing an emulsifier. The two kinds of emulsions most pertinent are the anionic and cationic types. 5. "Penetrating prime coat" means any application of asphalt to an absorptive surface to penetrate and bind the aggregate surface and promote adhesion between it and the new superimposed construction. Prime coats do not include dust palliatives of tack coats. 6. "Road oils" shall be synonymous with slow cure asphalts. 7. "Tack coat" means any application of asphalt applied to an existing surface to provide a bond between new surfacing and existing surface to eliminate slippage planes where the new and existing surfaces meet.