(415 ILCS 5/3.345) (was 415 ILCS 5/3.59)
    Sec. 3.345. Potential primary source. "Potential primary source" means any unit at a facility or site not currently subject to a removal or remedial action which:
        (1) is utilized for the treatment, storage, or
    
disposal of any hazardous or special waste not generated at the site; or
        (2) is utilized for the disposal of municipal waste
    
not generated at the site, other than landscape waste and construction and demolition debris; or
        (3) is utilized for the landfilling, land treating,
    
surface impounding or piling of any hazardous or special waste that is generated on the site or at other sites owned, controlled or operated by the same person; or
        (4) stores or accumulates at any time more than
    
75,000 pounds above ground, or more than 7,500 pounds below ground, of any hazardous substances.
    A new potential primary source is:
        (i) a potential primary source which is not in
    
existence or for which construction has not commenced at its location as of January 1, 1988; or
        (ii) a potential primary source which expands
    
laterally beyond the currently permitted boundary or, if the primary source is not permitted, the boundary in existence as of January 1, 1988; or
        (iii) a potential primary source which is part of a
    
facility that undergoes major reconstruction. Such reconstruction shall be deemed to have taken place where the fixed capital cost of the new components constructed within a 2-year period exceed 50% of the fixed capital cost of a comparable entirely new facility.
    Construction shall be deemed commenced when all necessary federal, State and local approvals have been obtained, and work at the site has been initiated and proceeds in a reasonably continuous manner to completion.
(Source: P.A. 92-574, eff. 6-26-02.)