A construction crew involved in a routine clean up uncovered a large amount of dynamite on Tuesday.
The dump is located in an area bound by Saint John's, Yellow Springs and Church Roads in Tredyffrin Township.
The boxes of old construction dynamite were found inside a metal shed.
Bomb squads from Montgomery County and Philadelphia have been called to remove the dynamite.
"The dynamite is old, and when it gets old, it gets unstable," said Capt. Andrew Chambers of Treddyfrin Twp. Police. "The bomb experts here are telling me that they can't move it. They have to render it safe here on site."
This section of Chester County has several quarries. Neighbors say they go back a decade or more, when blasting was commonplace.
"In 1990 or 1991, every twenty or thirty minutes you would hear boom, boom, boom. So, it's not surprising at all," said George Beech.
Officials think the dynamite was simply left behind and forgotten. The plan now is to burn the dynamite in ditches on location.
"They will hand carry it out (of the shed). They'll mix it with some materials to make it inert. They'll mix it with some diesel fuel to burn it. It will take a couple of hours to do that," said Chambers.
Nearby businesses were evacuated as a precaution during the process. The bomb squads finished the work by the end of the day.
