Siliceous Gravel or Crushed Stone 0 035 3070 75100 95100 CPA4* Siliceous Gravel, Chat or Crushed Stone 0 010** 95100 * Use with Basic Aggregate to produce Mixed Aggregate **If limestone or dolomite aggregates do not comply with Class 2 in subsection (3), the maximum percent retained is 5. (c) Deleterious Substances.