DEP probes methane bubbles
BY ELIZABETH SKRAPITS (STAFF WRITER)
Published: September 8, 2010
Warren Ruda / The Citizens' Voice DEP Secretary John Hanger said methane gas bubbling up in the Susquehanna River in Bradford County is likely 'gas that has migrated through the ground as a result of drilling in the area.'
The state Department of Environmental Protection is investigating the source of methane gas that bubbled up in the North Branch Susquehanna River near Sugar Run and six private water wells in Wilmot Township, Bradford County, last week.
The sites are in the same general location as two other instances of methane contamination involving a beaver pond and a residential water well, and Chesapeake Energy is evaluating its natural gas wells in the area, according to DEP Secretary John Hanger.
"This is probably gas that has migrated through the ground as a result of drilling in the area," he said.
Reports of gas bubbling up from the North Branch Susquehanna River came in to DEP late Thursday, with additional reports Friday. Hanger said DEP investigators were at the site all day Friday and are "running some pretty complex tests to identify what kind of gas it is and its source."
Chesapeake tested 26 residential wells within a half-mile radius of the river and found six of them had elevated methane levels. On Friday, high levels of methane were also detected in a crawl space of a seasonal home, according to DEP.
Methane is highly flammable and can cause fires or explosions. Chesapeake is taking corrective action at the new sites, as well as at the sites of two earlier incidents in the area, Hanger confirmed.
On June 25, DEP received a complaint of bubbling in a beaver pond west of Wyalusing. Methane was discovered Aug. 6 in a residential water well along Paradise Road in Terry Township.
Although Chesapeake has drilled numerous natural gas wells in the area - including the six wells at the Welles pad about two miles northwest of the Susquehanna River that DEP believes are the source of the earlier contamination - they have not been hydraulically fractured so no gas has been produced, Hanger said. The methane is not from the Marcellus Shale, which typically lies 5,000 to 8,000 feet deep, he said.
"The gas that is migrating is almost certainly gas from a shallower level, that should have been contained but wasn't," Hanger said.
DEP believes the wells at the Welles site are also the most likely source of the new contamination, but that has not been conclusively proved. The agency and Chesapeake are investigating. DEP expects analysis of lab results to be complete within two weeks.
"After testing of a section of the Susquehanna River near Sugar Run in Bradford County showed the presence of methane, Chesapeake immediately began working in cooperation with the PA Department of Environmental Protection to screen residences within a half-mile radius. Based on our field screenings, there is no immediate threat to public safety or the environment," said Brian Grove, Chesapeake's senior director of corporate development, in an e-mail.
"While the source of the methane has not yet been determined, Chesapeake is working closely with the DEP to find it," he stated. "Work will continue throughout the week to further #OOPS#ess the situation, and additional information will be provided when facts are confirmed."
Hanger said Chesapeake has been fully cooperative, including changing drilling practices, using different kinds of cement and well casings and agreeing to look at all 61 of its wells in the area.
eskrapits@citizensvoice.com, 570-821-2072
Link to source: http://citizensvoice.com/news/dep-probes-methane-bubbles-1.998409
Another article: http://www.timesleader.com/news/DEP_looks_at_drilling_as_river_bubbles_up_09-05-2010.html
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