Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
From the Associated Press:
The U.S. Environmental Protection Agency says two natural gas companies have agreed to improve their operations in western Pennsylvania.
In a statement released Tuesday, the EPA alleges that Mark West Liberty Midstream & Resources and Laurel Mountain Midstream Operating failed to comply with federal clean air regulations to prevent accidental releases of flammable substances.
The EPA says Mark West has agreed to install new emergency equipment and adopt an approved maintenance schedule at all 14 of its compressor stations in Washington and Butler counties.
In another settlement a Laurel Mountain Midstream facility in Washington County has agreed to conduct a safety analysis and make necessary improvements, as well as conduct training with local emergency responders.
The companies did not admit or deny EPA's allegations.