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■ existing surface is unsuitable , while rain is falling , or when there is water on the <br /> surface to be covered . <br /> 1 3 . 3 APPLICATION OF THE PRIME COAT <br /> A . The surface to be primed shall be clean and dry . For limerock bases , the glazed <br /> finish shall have been removed as specified in Section 02514 of these <br /> Specifications . <br /> 1 B . Apply the prime coat uniformly with a pressure distributor. The spray bar shall be <br /> set at the height recommended by the manufacturer to insure even distribution . The <br /> temperature of the material shall be between 100 and 150 degrees Fahrenheit as <br /> required for even distribution . The application rate shall be approximately 0 . 10 to <br /> 0 . 25 gallons per square yard , dependent upon the type of base material , sufficient <br /> to coat the surface thoroughly and uniformly without having any excess to form <br /> pools or flow off the base . <br /> C . Preferably , schedule the work so that the asphaltic concrete wearing surface is <br /> applied less than 2 hours after the prime coat has been applied . If more than 2 <br /> hours will pass before the final wearing surface is to be applied , apply a light , <br /> uniform application of clean sand or screenings and roll with a traffic roller to cure <br /> the prime coat . This shall be done before opening the road to any traffic . If <br /> warranted by traffic conditions , apply the prime coat on only one- half of the base <br /> width at one time , taking care to insure that the correct amount of bituminous <br /> material is placed at the joint . <br /> D . The base must be sufficiently moist in order to obtain maximum penetration of the <br /> bituminous material . <br /> 3 . 4 APPLICATION OF THE TACK COAT <br /> A . On newly constructed base courses , the application of the tack coat shall follow the <br /> application of the prime coat immediately prior to placing the wearing surface when <br /> the tack coat is required . In general , a tack coat will not be required on prime <br /> bases , except in areas which have become excessively dirty and cannot be <br /> ' cleaned , or in areas where the prime coat has cured and lost its bonding effect . <br /> B . The tack coat shall be an Emulsified Asphalt , Grade RS -2 . Apply the tack coat with <br /> a pressure distributor at a rate of 0 . 05 gallons per square yard and at a temperature <br /> between 100 and 150 degrees Fahrenheit . Keep the tack coat free of dust , foreign <br /> matter, and traffic until the wearing surface has been laid . <br /> + + END OF SECTION + + <br /> ' Last revised 2/26/02 02518-2 EAST GIFFORD <br /> FAPublic Works\KeithM\StormWeter Projects\Gfford East\Construction Contract\Technical Specifications\Fnal Specifications\Division <br /> 2\02518 - Prime and Tack Coats for Base Courses.doc <br />