CFR /  Title 30  /  Part 57  /  Sec. 57.7055 Intersecting holes.

Holes shall not be drilled where there is a danger of intersecting a misfired hole or a hole containing explosives, blasting agents, or detonators. [56 FR 46517, Sept. 12, 1991; 56 FR 52193, Oct. 18, 1991]