Regulation 72—Plans, specifications and site plans(1) A person who(a) intends to establish a plant for the manufacture of UN Class 1 or 5.1 substance shall submit in triplicate to the Chief Inspector for approval, detailed drawings, specifications and site plans of the proposed plant before construction relating to the proposed plant is commenced or carried out; or(b) operates a plant for the manufacture of UN Class 1 or 5.1 shall, where a significant alteration, modification, addition or extension of the plant is required, submit detailed drawings and specifications of the alteration, modification or extension in duplicate to the Chief Inspector for approval before the alteration, modification or extension is commenced or carried out.(2) A construction, alteration, modification or extension under subregulation (1) or (2) shall not, deviate from(a) the drawings and specifications approved by the Chief Inspector, or(b) any requirements given by the Chief Inspector.