Ill. Admin. Code tit. 62 § 240.500
For the purpose of this Subpart the term:
"Completion Fluids" means liquids that are used to complete or workover a well including saltwater, crude oil, frac fluids, acids and other treatment chemicals.
"Completion Fluid Waste" means completion fluids that are generated from the well during completion or workover activities.
"Drilling Fluid" means any freshwater based drilling muds, air or air foam mixtures used in the drilling of a well.
"Drilling Fluid Waste" means drilling fluids, muds and cuttings that are generated from the well during drilling activities.
"Oil Drilling Fluid" means any refined oil based drilling mud or drilling mud containing greater than 5% by volume crude oil.
"Saltwater Drilling Fluid" means any saltwater based drilling mud in excess of 10,000 ppm chlorides.
Ill. Admin. Code tit. 62, § 240.500
Amended at 19 Ill. Reg. 10981, effective July 14, 1995