Specifications include, but are not limited to: Asphaltic mixtures shall not be placed on any wet or frozen surface or when the weather conditions otherwise are detrimental to the proper handling or finishing of such mixtures. Asphaltic mixtures shall not be placed when the air temperature as measured in the shade is less than 40°F. Asphaltic base course material with thicknesses of three inches (3") or more may be placed when the air temperature as measured in the shade is 30°F or above with the approval of the Engineer if density and Marshall requirements can be obtained. For polymer modified asphalt mixtures with a Performance Grade of 70-28 or greater, base mixtures may be placed when the air temperature as measured in the shade is 45ºF or above, and surface mixtures may be placed when the temperature as measured in the shade is 50ºF or above, with the approval of the Engineer and if density and Marshall requirements can be obtained. In addition, the asphalt surface temperature for all subsequent placement after first base lift shall be 50ºF or above.