(a) “techniques” includes both the technology used and the way in which the
installation is designed, built, maintained, operated and decommissioned;
(b) “available” techniques means those developed on a scale which allows
implementation in the relevant industrial sector, under economically and
technically viable conditions, taking into consideration the costs and
advantages, whether or not the techniques are used or produced inside the
Member State in question, as long as they are reasonably accessible to the
operator;
(c) “best” means most effective in achieving a high general level of protection
of the environment as a whole