AL Sewer Projects Practice Questions - Alabama Sewer Projects Contractor Examination Exam

Hydrogen sulfide (H2S) is a special concern in sewers because it is:

A harmless sweet-smelling gas used as a perfume A toxic gas that can dull the sense of smell and cause rapid unconsciousness at higher concentrations Heavier than all liquids and always visible as a green cloud Required for concrete curing in manholes

Correct Answer:

A toxic gas that can dull the sense of smell and cause rapid unconsciousness at higher concentrations

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