Top Tier/Lower Tier
Top Tier/Lower Tier : The COMAH Regulations operate at two levels depending on the quantities of dangerous substances at an establishment. Schedules of specific "named substances" and "general categories" are presented in the Regulations. Establishments which have quantities of dangerous substances exceeding the top tier thresholds (either individually or following application of the COMAH aggregation rules) are known as "top tier" COMAH sites. "Top tier" status requires the operator to: (a) Notify the Competent Authority; (b) Prepare a Major Accident prevention Policy (MAPP); (c)Submit a written safety report; (d) Prepare an on-site emergency plan and to provide sufficient information for an off-site emergency plan to be prepared; (e) Make information available to the public. Establishments which have quantities of dangerous substances exceeding the lower tier thresholds (either individually or following application of the COMAH aggregation rules) but not the top tier thresholds are known as "lower tier" COMAH sites. "Lower tier" status requires the operator to: (a) Notify the Competent Authority; (b) Prepare a Major Accident prevention Policy (MAPP)
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