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The following additional considerations should be taken if the confined space cannot be fully decontaminated and / or gas test results cannot be met:
•No person shall enter a confined space unless H2S gas readings are below 500 PPM.
•No more than two workers should enter the space at once.
•All workers entering the space will wear breathing apparatus and should be in full body harnesses with lifelines attached.
•There should be two watch persons to affect a rescue if required.
•Even if breathing apparatus is worn, no one will enter a flammable atmosphere. The maximum allowable flammable gas concentration will be 20% LEL.