PART XVIII EXCAVATION, UNDERGROUND WORK AND ROCK CRUSHING — Rock crushing control measures
414
Rock-crushing plants shall be equipped with dust controls and
414(a)
rock crushers, including jaw, roll, cone or hammermills shall have an adequate mechanical exhaust system;
414(b)
the screen discharge hopper shall be enclosed and shall have an adequate mechanical exhaust system or an adequate water spray system;
414(c)
screens shall have partial covers and shall have an adequate mechanical exhaust system or an adequate water spray system;
414(d)
material-transfer points shall have an adequate mechanical exhaust system or an adequate water spray system; and
414(e)
discharge from a mechanical exhaust system shall be located to prevent the recirculation of contaminated air to areas occupied by a worker.
Not legal advice. Verify the cited article against the signed agreement.