Fire crews responded around 4:30 a.m. to the Downingtown Sewer Plant on 550 Brandywine Ave., according to Downingtown police chief Howard Holland.
Crews secured the leak and the order was cleared around 9:30 a.m., Holland said.
Route 322 was temporarily shut down between Boot Road and Bradford Avenue, East Brandywine fire officials said.
No further information was immediately available.
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