Marcellus Shale - Gas Wells

October 28, 2010

Firm finds fracking chemicals in Dimock well

MICHAEL RUBINKAM Associated Press Writer

DIMOCK — A private consulting firm says it found toxic chemicals in the drinking water of a Pennsylvania community already dealing with methane contamination from natural gas drilling.

Environmental engineer Daniel Farnham said Thursday that his tests, which were verified by three laboratories, found industrial solvents such as toluene and ethylbenzene in “virtually every sample” taken from water wells in Dimock Township, Susquehanna County.

Farnham, who has tested water for both gas interests and for local residents, said it would be impossible to say that the chemicals he found were caused by gas drilling.

The chemicals, at least one of which, ethylbenzene, may cause cancer, are among dozens used to hydraulically fracture shale deposits to unlock natural gas trapped thousands of feet underground. The chemicals are also used in an array of products ranging from paint thinner to gasoline.

Millions of gallons of water mixed with numerous chemicals and sand are blasted deep into the earth to free gas from the shale rock. As much as 90 percent of the mixture is left underground.

Dimock residents sued Houston-based Cabot Oil & Gas Corp. last year, alleging the drilling company polluted their wells with methane gas and other contaminants. Pennsylvania’s Department of Environmental Protection said defective casings on at least three of Cabot’s wells allowed gas to pollute groundwater. Cabot was fined more than $240,000 and ordered to clean up the pollution.

On Thursday, DEP said it would spend about $10.5 million to provide safe water for the affected Dimock residents, connecting their homes to a municipal water supply in Montrose, about six miles away.

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