Section 4(1)(b) in Punjab Major Accident Hazard Control Rules, 1993
(b)an isolated storage in which a [threshold quantity] [Substituted for 'quantity' vide Punjab Notification No. G.S.R.45/C.A. 63/48/S. 112/Amd. (I)/2002, dated 27.11.2002.] of a hazardous chemical listed in column 2, of Schedule 2 which is equal to or more than the quantity specified for that chemical in column 3 of the said Schedule, is involved.