Why are gasoline and volatile solvents objectionable when present in a sewer?

Gasoline and volatile solvents are objectionable in a sewer primarily due to the explosion hazard they present. These substances are highly flammable, and when mixed with air, they can create explosive mixtures. In sewer systems, where conditions can lead to the accumulation of gases, the presence of such volatile compounds increases the risk of fire or explosion, especially near sources of ignition or in confined spaces.

While other factors, such as unpleasant odors or potential for groundwater contamination, are valid concerns, the immediate danger of an explosion poses a critical risk that is particularly significant in the context of sewer maintenance and safety protocols. Addressing the explosion hazard is paramount because it can lead to catastrophic incidents that could endanger workers and the surrounding community.