required between the excavating and transporting activities. It is advan- 

 tageous to maintain a stockpl le of at least moderate size to serve as a 

 buffer between excavating and transporting. Gravel stockpiles remained on or 

 immediately adjacent to nine of the study sites, however, only Dietrich 

 R i ver-Upstream, Jim River, and Phelan Creek stockpi les were sti I I being 

 used. 



PROCESSING 



Gravel processing can involve screening, washing, crushing, mixing, or 

 combinations of these. Materials of the study sites frequently were fairly 

 uniform, subrounded to well-rounded, hard gravels with varying amounts of 

 sand and cobbles. Such materials are suitable for road embankments with 

 little or no processing. However, silt content should be limited to approxi- 

 mately 10 percent to minimize frost susceptibility. Processing apparently 

 was only conducted at those study sites used for construction of the Trans- 

 Alaska Pipeline System where screening and some crushing were done to pro- 

 duce bedding and padding material for the below-ground pipeline. 



328 



