The following words and phrases when used in this chapter shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Public improvement." The term includes, but is not limited to, the following:
(1) The building, paving, grading, rebuilding, repaving and regrading of streets, sidewalks, curbs and gutters.
(2) The creation, extension and renovation of water and sewerage collection, transmission, treatment and disposal systems.
(3) The creation, extension and renovation of storm, surface and subsurface drainage systems.
(4) The construction, reconstruction and repair of wharves and docks.
(5) The installation of pipes, wires and conduits relating to city-supplied utility services.
(6) The installation, maintenance or operation of lighting that services the streets and sidewalks within the city.
(7) The planting, maintaining, trimming, transplanting, removal and protection of shade trees.