An administrative law judge has allowed Sunoco Pipeline LP to resume horizontal directional drilling (HDD) on a stretch of its Mariner East pipeline system in southeast Pennsylvania, overturning an order from state regulators that stopped construction last week.

Mariner East

Sunoco appealed the order to the Pennsylvania Environmental Hearing Board (EHB), which oversees decisions made by the state Department of Environmental Protection (DEP). The company argued that a prolonged work stoppage at the site in Chester County’s West Whiteland Township risked losing the 2,800-foot borehole and allowing more groundwater to be discharged. 

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