"Aging Pipes, Deadly Hazards"
"Despite a long history of accidents, and a stack of warnings from safety investigators, there are still thousands of miles of antiquated, leak-prone, cast-iron pipelines running under the streets of Pennsylvania cities and towns. Some are more than 100 years old."
Joseph Tanfani and Craig R. McCoy report the last of a four-part "Battle Lines" series for the Philadelphia Inquirer's Deep Drill reports December 18, 2011.