35 Ill. Adm. Code 203.1080
Begin Actual Construction
Section
203.1080Â Begin Actual Construction
"Begin actual construction" means in general,
initiation of physical on-site construction activities on an emissions unit that
are of a permanent nature. Such activities include, but not limited to, installation
of building supports and foundations, laying of underground pipework, and
construction of permanent storage structures. With respect to a change in
method of operations, this term refers to those on-site activities other than
preparatory activities which mark the initiation of the change.