Administrative Code

Virginia Administrative Code
11/27/2021

Part V. Air Quality and Physical Agents—Surface and Underground

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 Employees shall be withdrawn from areas where airborne contaminants given a "C" designation in Threshold Limit Values and Biological Exposure Indices are present in concentrations that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

Statutory Authority

§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.

Historical Notes

Derived from VR480-05-1.2 § 5.1, eff. July 19, 1989; amended, Virginia Register Volume 14, Issue 17, eff. July 1, 1998; Volume 25, Issue 20, eff. July 8, 2009.

4VAC25-40-730. (Repealed.)

Historical Notes

Derived from VR480-05-1.2 § 5.2, eff. July 19, 1989; repealed, Virginia Register Volume 14, Issue 17, eff. July 1, 1998.

4VAC25-40-740. Dust sources.

Sources of dust shall be wetted down unless controlled by dry collection measures.

Statutory Authority

§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.

Historical Notes

Derived from VR480-05-1.2 § 5.3, eff. July 19, 1989.

4VAC25-40-750. (Repealed.)

Historical Notes

Derived from VR480-05-1.2 § 5.4, eff. July 19, 1989; repealed, Virginia Register Volume 14, Issue 17, eff. July 1, 1998.

4VAC25-40-760. Silica compounds.

Silica sand or other materials containing more than 1.0% free silica shall not be used in abrasive cleaning equipment unless exposed persons are provided with self-contained respiratory equipment.

Statutory Authority

§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.

Historical Notes

Derived from VR480-05-1.2 § 5.5, eff. July 19, 1989.

4VAC25-40-770. Employee exposure to noise limits.

Except for surface mines which are inspected by MSHA, employee exposure to noise shall not exceed the federal limit adopted for mineral mines. If exposure exceeds the federal limit, the director may require the mine operator to employ feasible engineering and administrative control measures. Operators shall provide hearing protection upon request.

Statutory Authority

§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.

Historical Notes

Derived from VR480-05-1.2 § 5.6, eff. July 19, 1989; amended, Virginia Register Volume 14, Issue 17, eff. July 1, 1998.

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