Case C-654/18: Judgment of the Court (Fifth Chamber) of 28 May 2020 (request for a preliminary ruling from the Verwaltungsgericht Stuttgart — Germany) — Interseroh Dienstleistungs GmbH v SAA Sonderabfallagentur Baden-Württemberg GmbH (Reference for a preliminary ruling — Environment — Shipment of waste — Regulation (EC) No 1013/2006 — Procedure of prior written notification and consent — General information requirements — Annex IIIA — Mixture of paper, paperboard and paper products — Entry B3020 of Annex IX to the Basel Convention — Impurities — Contamination of a mixture by other materials — Environmentally sound method of recovery)