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38 pea gravel is meant to be 3/8" pea gravel and is 1.4 tons/cy or roughly 104 lbs/cf.
typically the size of peas hence the name pea gravel
Pea stone is gravel that is about 1/4 inch in diameter (the size of a pea).
The sub-grade's compacted soil, topped by the sub-base of crushed stone and then the pea gravel.