On January 16, the New Jersey Department of Environmental Protection (NJDEP) published its new guidance on vapor intrusion, including significant changes to the groundwater vapor intrusion screening levels. Parties involved in the remediation process should discuss the impact of the new guidance with their environmental professionals. The link to the new NJDEP guidance is http://www.nj.gov/dep/srp/guidance/vaporintrusion/index.html.
Of particular note – the groundwater vapor intrusion screening level for tetrachloroethene (also known as perchloroethylene), which is commonly associated with dry cleaning operations, has increased. This increase of the screening level may end the Immediate Environmental Concern/Vapor Concern classification at many dry cleaning sites that are undergoing remediation.
The link to the NJDEP’s summary of how to implement the new guidance is: