35 Ill. Adm. Code 203.103
Actual Construction
Section 203
Section 203.103 Actual
Construction
"Actual Construction"
means in general, initiation of physical on-site construction activities on an
emissions unit which are of a permanent nature. Such activities include, but
are not limited to, installation of building supports and foundations, laying
of underground pipework, and erection of permanent storage structures. With
respect to a change in method of operation, this term refers to those on-site
activities other than preparatory activities which mark the initiation of the
change.