A. Every worked-out area shall be either sealed or ventilated.
B. Where the practice is to seal worked-out areas, the sealing shall be done in accordance with sealing provisions of the approved bleeder plan.
Code 1950, § 45-60.5; 1954, c. 191; 1966, c. 594, § 45.1-62; 1993, c. 442; 1994, c. 28, § 45.1-161.228; 1996, c. 774; 1999, c. 256; 2005, c. 3; 2021, Sp. Sess. I, c. 387.