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<br />(d) To el~in.te the du.t null.noe, the alxiftS pl~t <br />ahall be equipped with proper hou.in,s for conveyora, acreen., <br />mixer., etc., end an approved type of du.t collectins .yat.. of <br />adequate capacity. Dust collecto~. .hall be '0 constructed a. to <br />~8te or return any part or all of the dust to the hot elevator, a. <br /> <br />""31 <br />. , <br /> <br />(-..., <br /> <br />directed by tbe Engineer. <br />The plant shall be 10 operated that the amount of <br /> <br />amoke will be reduced to . mintmum. <br /> <br />(.) Before May 15 and after September 15 of any year, <br />and at all other times when in the opinion of the Engineer, the <br /> <br />length of haul will cause excelsive 1086 of beat in the mixture. <br /> <br />all truck boxes used for hauling mixtures shall be insulated with <br />insulatins material not less than 1/2 inch thick. <br />(f) The placement of each course shall be completed <br />over the full width of the .ection under construction on each day'. <br /> <br />run. <br /> <br />(g) The rolling equipment for each opera.ing paver <br />ahall consist of not less than 2 aelf-propelled steel Wheeled <br />rollers) at least one of which shall be of the tandem type. When <br />the amount of bituminous mixture placed by one paver exceed. 120 <br />ton, per hour, 3 rollers will be required at that paver. All roller. <br />ahall exert a pressure of not le8s than 250 pound I per linear inch <br /> <br />on the rear roll. <br /> <br />v <br /> <br />(h) The plant-mixed bituminous mixtures may be placed <br />in the Fall after October 1st only on the condition that, in addi- <br />tion to all other requirements, each layer shall be compacted by <br />two complete coverages of a self-propelled pneumatic-tired roller <br />weighing not less than ZOO pounds per inch of rolling width. Such <br />rolling shall be accomplilhe4 between tbe initial and final rolllng. <br />.pecifled to be done by the Iteel wheeled rollers. <br />