4VAC25-40-720: Employee exposure limits to airborne contaminants

With respect to airborne contaminants, the following shall apply:

1. Employees shall be withdrawn from areas where airborne contaminants given a "C" designation in Threshold Limit Values and Biological Exposure Indices are present in concentrations that exceed specified TLVs.

2. Control of employee exposure to harmful airborne contaminants shall be by feasible engineering control methods. If such control measures are not available, an approved program of controlling employee exposure to airborne contaminants shall be implemented by the operator. Miners exposed for short periods to gas, dust, fumes and mist-inhalation hazards shall wear acceptable respiratory equipment appropriate for the hazard. When the exposure is for prolonged periods, other measures to protect workers or to reduce the hazard shall be taken.