http://www.legislation.gov.uk/uksi/1990/304/contents/madeHazardous substancesBusiness practice and regulationHealth and safety at workFire and rescue servicesRegulation and deregulationThe Dangerous Substances (Notification and Marking of Sites) Regulations 1990Queen's Printer of Acts of Parliament2012-01-31HEALTH AND SAFETY These Regulations require the notification and marking of sites where there is a total quantity of 25 tonnes or more of dangerous substances present at the site. ARRANGEMENT OF REGULATIONS 1 Citation and commencement. 2 Interpretation. 3 Exceptions. 4 Notification. 5 Access Marking. 6 Location marking. 7 Signs to be kept clean, etc. 8 Enforcing authority. 9 Exemption certificates. 10 Transitional provisions. 11 Repeals. Schedule 1 Exceptions. Schedule 2 Matters to be notified. Part I Particulars to be notified under regulation 4(1). Part II Changes to be notified under regulation 4(2). Schedule 3 Table of classifications and hazard warnings. Schedule 4 Repeals and enabling powers. 1990 No. 304 Made 16th February 1990 Laid before Parliament 1st March 1990 Coming into force 1st September 1990 The Secretary of State, in exercise of the powers conferred on him by sections 15(1), (2), (3)(c), (4)(a), (5)(b), 80(1), (4), and 82(3)(a) of, and paragraphs 1(1)(b), 15(1) and 21(a) of Schedule 3 to, the Health and Safety at Work etc. Act 1974 (“the 1974 Act”), the provisions of the Acts mentioned in column 1 of Schedule 4 to these Regulations which are specified opposite thereto in column 4 of that Schedule and of all other enabling powers; for the purpose of giving effect without modifications to proposals submitted to him by the Health and Safety Commission under section 11(2)(d) of the 1974 Act after carrying out by the said Commission of consultations in accordance with section 50(3) of that Act; and it appearing to him that the repeal of the provisions of the Acts mentioned in column 1 of Schedule 4 to these Regulations which are specified opposite thereto in column 3 of that Schedule (provided for by section 80(1) of the 1974 Act as applied by the provisions specified in column 4 of that Schedule) is expedient, after the carrying out by him of consultations in accordance with section 80(4) of the 1974 Act, hereby makes the following Regulations: 1974 c. 37; sections 15 and 50 were amended by the Employment Protection Act 1975 (c. 71), Schedule 15, paragraphs 6 and 16 respectively.