Emails between Shell communication officials were made public as part of a congressional investigation into the fossil fuel industry and climate change.
The waste hauler illegally dumped solid waste from pipeline projects at five sites in Fayette County. DEP found no risk of harm to the public or the environment.
DEP issued a notice of violation to Shell for exceeding its limit for volatile organic compounds. The pollution was a result of flaring while it was starting up its ethane cracker.
More problems have been found at the Cambria County site. DEP has ordered the company to stop injecting gas into its storage wells and submit a clean-up plan.