Keith,
right from the Pond Boss Nov/Dec '05
...they look for soils that have a P.I. between 13 and 30......(now paraphrased): learn the plastic limit (correct amt of water to go from dry to the correct amt for adequate compaction). Next, the liquid limit (amt of water to go from no moisture to mud). The rest is a calc to arrive at the Plasticity Index.
Call the PB office, ask for Cathy, and she will send you a copy. The balance of the article will help (not to mention the entire pub)
