1. HYDRAULIC FRACTURING
Groundwater contamination risk higher in parts of Marcellus Shale -- study
There is a higher potential for contamination of groundwater by fugitive gases from the Marcellus Shale in some parts of northeastern Pennsylvania, a new study suggests. Methane, which is a key component of natural gas extracted by hydraulic fracturing, could flow through natural pathways that link the Marcellus deep underground to aquifers near the surface. The study finds evidence that such pathways do, in fact, exist.