Texas Eastern Transmission, LP filed for a Clean Water Act section 401(a)(1) water quality certification with the Pennsylvania Department of Environmental Protection. The company submitted a copy of the application to the Federal Energy Regulatory Commission. They notified that the agency has until November 16, 2021, to act on the certification request. If the Pennsylvania Department of Environmental Protection does not act by that date, their authority to certify the request will be considered waived according to federal law.
Simple Explanation
Texas Eastern Transmission wants permission to make sure water stays clean while working on a project in Pennsylvania. If the Pennsylvania office does not give an answer by November 16, 2021, it will be like they said "yes" anyway.