Civil Engineering - Waste Water Engineering - Discussion

11. 

Pick up the incorrect statement from the following for allowing workers to enter sewers

[A]. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
[B]. Proper tests for the presence of poisonous gases must be carried out
[C]. The men entering the manhole should be advised to smoke in the sewer
[D]. Warning signals should be erected
[E]. None of these.

Answer: Option C

Explanation:

No answer description available for this question.

Sultaan said: (Jun 24, 2018)  
No, smoking or open flames should be allowed, as methane gas is highly inflammable.

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