SECOND SCHEDULE
Regulations 2(1), 8(1), 11(1) and 13(1)(a)
Major hazard installation
  Any premises where processing, manufacturing or bulk storage by way of trade or for the purpose of gain is carried on of one or more dangerous substances specified in the First Schedule where —
(a)the quantity of a dangerous substance present or is likely to be present in the premises —
(i)being a dangerous substance specified in the first column of Part 1 of the First Schedule, is equal to or exceeds the corresponding threshold quantity in the third column; or
(ii)being a dangerous substance within a category specified in the first column of Part 2 of the First Schedule, is equal to or exceeds the corresponding threshold quantity in the second column; or
(b)the aggregate sum of ratios, of the dangerous substances specified in the First Schedule present or likely to be present in the premises, that is calculated using the following formula, is equal to or exceeds 1:
where —
(i)x, y, [....] and n are the dangerous substances present or likely to be present in the premises;
(ii)qx, qy, [....] and qn is the total quantity of the respective dangerous substances x, y, [....] and n present or likely to be present in the premises; and
(iii)Qx, Qy, [....] and Qn is the corresponding threshold quantity specified in the third column of Part 1 of the First Schedule or the second column of Part 2 of that Schedule, as the case may be, for each dangerous substance x, y, [....] and n.