51.2 No person shall catch and retain or possess any shellfish of a species set out in column I of an item of the table to this section, the length of which is less than the minimum length set out in column II of the item.

All processes directly or indirectly linked to the production of phenol and acetone are included, in particular air compression, hydroperoxidation, cumene recovery from spent air, concentration and cleavage, production fractionation and purification, tar cracking, acetophenone recovery and purification, AMS recovery for export, AMS hydrogenation for ISB recycle, initial waste water purification (first waste water stripper), cooling water generation (e.g. cooling towers), cooling water utilisation (circulation pumps), flare and incinerators (even if physically located OSB) as well as any support fuel consumption

(a) support: acid-washed and silanized diatomaceous earth, or other suitable inert support with a narrow range of grain size (25 mm range between the limits 125 to 200 mm) the average grain size being related to the internal diameter and length of the column;