(a) No dry sandblasting shall be permitted except where wet sandblasting cannot be done due to unique circumstances.
(b) Whenever sandblasting is done, contaminant methods such as blast-cleaning machines and cabinets shall be used.
(c) Whenever sandblasting is done, curtains shall be used as temporary dust-containment structures.
(d) A minimum of three days notice shall be given by the contractor to owners, tenants and occupants of all structures within one hundred fifty feet of the site on which sandblasting is to be done.