22.—(1) The mine operator shall ensure that—
(a)there are in place in the zones classified under regulation 7(1) of DSEAR, specific arrangements to detect the presence, and monitor the concentration, of flammable gas; and
(b)measures are taken to reduce the level of flammable gas in any zone in which it has been detected to as low a level as is reasonably practicable.
(2) The measures referred to in paragraph (1)(b) shall include (where necessary) drainage, removal and dilution.