"Residual fuel oil" means fuel oils of grade No. 4, 5 and 6 as specified in detailed requirements for fuel oils ASTM D-396-69 (1971) incorporated by reference in 35 Ill. Adm. Code 218.112 and 219.112.
Ill. Admin. Code tit. 35, § 211.5590
Added at 17 Ill. Reg. 16504, effective September 27, 1993