The Borough of Plum ("Borough"), located in Allegheny County, Pennsylvania, timely filed a petition for review of an Underground Injection Control (•'UIC") permit that the U.S. Environmental Protection Agency Region 3 ("Region") issued to Penneco Environmental Solutions, LLC ("Penneco"), on March 7, 2018. The permit authorizes Penneco to operate a Class II UIC well to dispose of brine produced during oil and natural gas production operations. The well, referred to as the Sedat #3A well. is located in the Borough.