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

Sanitary manholes and wet wells can be hazardous confined spaces mainly because of:

Excess oxygen that always exceeds 30% Potential oxygen deficiency, toxic gases such as hydrogen sulfide, and engulfment or fall hazards Complete absence of any atmospheric risk after the cover is removed Guaranteed safe conditions if the crew works quickly without meters

Correct Answer:

Potential oxygen deficiency, toxic gases such as hydrogen sulfide, and engulfment or fall hazards

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