Please be advised, chapter 21's entry covering soils seems to have some factual problems.
Specifically, regarding grain size for differing soil types, Ballast's values are very off.
Chapter 9 also has a section covering soils, but I have verified there given grain sizes to be accurate / acceptable.
It seems that chapter 21 failed to properly incorporate the general content of the previous chapter 9, and has even attempted to convert chapter 9's metric values into imperial ones (they failed by the way - several values are not even close).
If you are going to be chasing down referenced material in addition to the core chapter readings for this division, please be aware of this and verify the values for yourself.
In the end this little slip-up probably will not affect your PA test taking experience, but you never know.
PPD, however, could potentially be a different story.
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