5-04.3(1)	Hot Asphalt Mixing Plant
(March 9, 2016 APWA GSP)

Supplement this section with the following:

Plants used for preparation of PHMA shall conform to the following requirements:

Fiber Supply System
When fiber stabilizing additives are determined necessary to achieve drain down criteria per APWA GSP 5-04.3(7)A of these Specifications, a separate feed system that meets the following shall be required:

1.	Accurately proportions by weight the required quantity into the mixture in such a manner that uniform distribution will be obtained.
2.	The fibers shall be uniformly distributed prior to the injection of the asphalt binder into the mixture. When a continuous or drier-drum type plant is used, the fiber shall be added to the aggregate and uniformly dispersed prior to the injection of asphalt binder.

Surge and Storage Systems
The storage time for PHMA/PWMA mixtures shall be no more than four (4) hours for non-insulated silos or eight (8) hours for insulated silos. Placement temperature specifications shall be met regardless of silo storage time.