French to English Tech/Engineering Construction / Civil Engineering tender instructions

It's a document related to a call for tenders for large-scale construction work.

My problem: up to now, I was under the impression that "entretien" and "maintenance" meant the same thing. But in my document these two terms always appear together, so, it seems, they are not being used alternatively to mean the same thing but rather (apparently) to refer to two different processes. I just can't figure out what the difference between them could be...

Here are some example sentences:

"Le titulaire est en charge de l'ensemble des missions relatives à la réalisation du Project, y compris le financement, la conception, la construction, l'entretien, la maintenance et le renouvellement de l'infrastructure."

"L'association foncière aura pour objet le paiement d'entretien, de maintenance et de renouvellement de l'infrastructure."

I am not sure what to do with "renouvellement" either.

Any ideas regarding these three terms, especially what the difference between "entretien" and "maintenance" might be, and how to translate them differently, are very welcome!

Thanks very much in advance!