This Clean Air Act (CAA) matter resolves New Source Review (NSR), Prevention of Significant Deterioration (PSD), and Title V violations for excess emissions of volatile organic compounds (VOCs) at pig launching and receiving operations at compressor stations and stand-alone stations in eastern Ohio and western Pennsylvania. MarkWest's facilities in western Pennsylvania are located in an ozone nonattainment area. MarkWest is eager to conclude this settlement, and has already invested significant resources to comply with several elements of the injunctive relief.
MarkWest has agreed to the following elements of injunctive relief for compressor stations (23 facilities) and large stand-alone sources (19 facilities) in the Ohio and Pennsylvania natural gas gathering system: (1) connection of high pressure pig launchers and receivers by jumper lines to a low pressure gathering line; (2) operation of jumper lines to depressurize such launchers and receivers prior to opening the launcher or receiver hatch; (3) installation and use of pig ramps in pig receivers; (4) use of a flare to control VOC emissions, when necessary, to ensure that VOC emissions do not exceed the state permitting threshold or permitted emissions limitations; and (5) submission of non-Title V state-only operating permits, or non-Title V Permits to Install and Operate, that are federally enforceable and will survive termination of the Consent Decree. To resolve violations of the small stand-alone sites (125