Which type of water main is most susceptible to contamination from gasoline-saturated soil?

The primary concern regarding contamination from gasoline-saturated soil revolves around the permeability and chemical resistance of the materials used in water mains. PVC, or polyvinyl chloride, is known for its chemical resistance, but it lacks the durability and impermeability that can prevent contamination in environments where hydrocarbons like gasoline may be present.

When gasoline saturates the soil, it can permeate certain types of materials more easily than others. PVC has a risk of being penetrated or impacted by aggressive chemicals, leading to potential contamination of the water supply. Unlike steel or cast iron, which may corrode or rust but tend to maintain a barrier against certain contaminants, PVC does not provide the same level of resistance. Additionally, asbestos cement can resist many chemicals but is not typically used as much in modern installations due to its health risks.

In summary, while PVC pipes are lightweight and easy to handle, they are not the best choice for areas at risk for environmental contamination from substances like gasoline. Their susceptibility in this context makes them a significant concern compared to the other materials listed.