56As regards the argument that the principles of legal certainty and non-retroactivity of the law are breached by the extension of the after-care period of landfills regardless of the date on which the waste was stored and without any limitation as regards the financial implications for the holder of the waste, it is true that it follows from settled case-law that, in order to ensure observance of the principles of legal certainty and the protection of legitimate expectations, the substantive rules of EU law must be interpreted as applying to situations existing before their entry into force only in so far as it clearly follows from their terms, objectives or general scheme that such effect must be given to them (judgment of 14 March 2019, Textilis, C‑21/18, EU:C:2019:199, paragraph 30 and the case-law cited).
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