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Virginia Administrative Code
Title 4. Conservation And Natural Resources
Agency 25. Department of Energy
Chapter 40. Safety and Health Regulations for Mineral Mining
11/23/2024

4VAC25-40-880. Ground vibration from blasting.

A. Ground vibration, measured as peak particle velocity resulting from blasting, shall not exceed the limits set forth in Figure 1 at any inhabited building not owned or leased by the operator, without approval of the director. A seismographic record shall be provided for each blast.

https://law.lis.virginia.gov/RISImages/402240466939LEGLDH_files/image001.jpg

B. Seismic monitoring of each blast shall be conducted, unless the blast contains no more than 500 pounds of explosives and the scaled distance, Ds, is 90 feet or more, as calculated with the following scaled distance formulas:

https://law.lis.virginia.gov/RISImages/647373450129LEGAB_files/image001.gif

Where:

W = Maximum charge weight of explosives in pounds per delay period of 8.0 milliseconds or more.

D = Distance in feet from the blast site to the nearest inhabited building not owned or leased by the mine operator.

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 § 6.11, eff. July 19, 1989; amended, Virginia Register Volume 14, Issue 17, eff. July 1, 1998; Volume 25, Issue 20, eff. July 8, 2009; Volume 35, Issue 4, eff. November 30, 2018.

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