Waste Water Engineering

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

  • A. The particular manhole and one manhole on upstream and one manhole on downstream 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
Answer: Option C.
Explanation: 

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