One Less Engine at Welling Compressor Station as a Result of Comments

On June 25, 2012, the Clean Air Council and Group Against Smog and Pollution submitted comments on Plan Approval 63-00958A submitted by MarkWest which proposed to install five additional compressor engines, one diesel engine and capacity expansion of a dehydrator/reboiler at their Welling Compressor Station in Washington County.

After reviewing the facilities calculations for its potential to emit pollution and pointing out various flaws, PA DEP was forced to recalculate. As PA DEP stated in their response to comments:

• Upon review of all public comments received with the subject application and comparison of this application with that for another MarkWest facility with similar configuration, the Department reevaluated the emissions potential for CO2e at Welling and determined that as proposed, the CO2e emission potenial for Welling would be 100,071 tons per year of CO2e. On July 16, 2012, the Department conveyed this information to MarkWest. In response, MarkWest indicated that one of the proposed Waukesha P9390GSI engines would be removed from its proposal to ensure that Welling remained a minor source.