After blasting has been carried out at a blasting site—
(a) no-one may enter the blasting site until the shotfirer, or a person authorised by the shotfirer, is satisfied that any fumes and toxic gases created by the explosion are at safe levels; and
(b) before any further work is carried out at the site, the site must be carefully inspected for the presence of unfired or misfired explosives; and
(c) drilling must not be undertaken at the site until—
(i) the whole site has been thoroughly washed down, if necessary; and
(ii) all butts have been carefully inspected and, if necessary, thoroughly washed and cleaned; and
(iii) any misfire has been treated as required by division 2.9.11 (Misfire precautions).