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FC § 5607.9.1
The department shall approve the size of the blast area, which shall be not less than 500 feet (152 400 mm) in diameter, and the size of blast site, which shall be a minimum of 50 feet (15 240 mm) in all directions from the perimeter of the area in which explosives are being or have been loaded, including all holes loaded or to be loaded for the same blast.
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