This stuff has scared me since the gas main explosion in San Bruno when I lived in California. There is a huge pipeline that runs from New York down to the Gulf states, cutting straight through this area of Northern Virginia. It runs half a mile from my house, and right through many, many housing developments.
https://www.nbcwashington.com/news/local/northern-virginia/dozens-of-homes-evacuated-after-explosion-in-centreville/4061521/