"Although they represent only a small fraction of the total wells drilled in Pennsylvania, Marcellus Shale wells accounted for a quarter of all enforcement actions brought by the Department of Environmental Protection last year.

The DEP, which inspects oil and gas wells and cites operators for violations, chose to pursue 173 enforcements against Marcellus Shale drillers, resulting from 638 shale violations recorded in 2009. Enforcement actions typically lead to fines and/or settlement agreements."


Read more: Marcellus Shale hit with one-quarter of Pennsylvania enforcement actions in 2009 - Pittsburgh Business Times