Why are gasoline and volatile solvents particularly concerning when found in a sewer system?

Gasoline and volatile solvents are particularly concerning in a sewer system primarily due to their potential to produce an explosion hazard. These substances are highly flammable and can easily vaporize, creating a mixture with air that is capable of igniting. When introduced into the confined spaces of a sewer system, the accumulation of these vapors poses a significant risk, as even a small spark can trigger an explosion.

This risk is exacerbated by the nature of sewer systems, which often lack adequate ventilation, allowing flammable vapors to concentrate. The possibility of ignition in such environments dramatically increases the danger to workers, emergency responders, and the structural integrity of the sewer infrastructure.

While gasoline and volatile solvents can also have toxic effects on aquatic life and may create foul odors, the immediate concern regarding their presence in sewer systems centers on the serious explosion hazard they represent.