Amendment status not verified — confirm the current text below against the official source.
In compliance to Rule 6(3) b, it shall be ensured by the AE/JE/Supervisor that none of the toxic gases are present inside the sewer line for allowing the workers to go inside. The limit of gases is tabulated as under: - S. No. GAS MAXIMUM LIMIT FOR 1 HOUR EXPOSURE MAXIMUM LIMIT FOR 8 HOUR EXPOSURE 1 CO 0.04% by volume in air 0.005% by volume in air 2 H2S 0.02% by volume in air 0.001% by volume in air 3 CH4 Probably no limit provided oxygen percentage is sufficient 1% by volume in air 4 O2 Oxygen level should be 19.5 – 21 % by volume in air