Equitrans (nee EQT Midstream) owns a natural gas storage field in Greene County, PA, in the southwest corner of the state, called Swarts Field. Natural gas storage fields are an important, but often overlooked, part of the natgas ecosystem. Last December the state Dept. of Environmental Protection (DEP) threatened to shut down Swarts Field because of coal mining in the area, saying Equitrans had not properly mapped old/abandonded conventional gas wells in the area (see PA DEP Threatens to Close Equitrans Gas Storage Field in SWPA). The good news is the DEP threat is now over. The bad news is that Equitrans has to pay a $650,000 fine.