upper-tier establishment
as defined in Directive 2012/18/EU of the European Parliament and of the Council of 4 July…, Article 3, point (3) (Definitions)
an establishment where dangerous substances are present in quantities equal to or in excess of the quantities listed in Column 3 of Part 1 or in Column 3 of Part 2 of Annex I, where applicable using the summation rule laid down in note 4 to Annex I