Construction shall be deemed to have started with the initiation of any of the following construction activities:

(1) Site preparation by grading of the site, foundation excavation, or other significant earthwork on the site;

(2) Construction of footings or foundations, form work, installation of rebar, or pouring concrete for a project's major components or auxiliary structures;

(3) Excavation for natural gas supply, water supply, water or waste water discharge pipelines or structures;

(4) Earthwork or construction of access or service roads, electrical transmission lines, switchyard structures, or laydown areas.