The Mariner East 2 pipeline is proposed to carry Highly Volatile Liquids (artificially liquefied Ethane, Propane, Butane gas) through several densely populated areas in Southeastern Pennsylvania. Much of route through Chester and Delaware counties would be considered Class 4 High Consequence Areas by Natural Gas standards. However, these artificially liquefied gases have hazards greater than traditional Natural Gas. “Natural Gas Liquids”, or “NGLs” are maintained in an arti