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Don't want the hassles of Black Friday - consider a refurbished gift this year; day after Thanksgiving travel could be messy - and supporters regroup for recreational marijuana in South Dakota.

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Big retailers predict an historic holiday shopping season, but small businesses are not sharing that optimism, and economists weigh in on what s behind the nation's labor shortages.

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South Dakota foster kids find homes with Native families; a conservative group wants oil and gas reform; rural Pennsylvania residents object to planes flying above tree tops; and poetry debuts to celebrate the land.

Contaminated Texas Drinking Water Linked to Faulty Shale Gas Wells

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Tuesday, September 16, 2014   

FORT WORTH, Texas - A new study finds contamination of drinking water in parts of Texas from the extraction of shale gas, but the primary cause is not what some people had feared.

Researcher Avner Vengosh says the contamination of the wells that they analyzed was not directly from the process of hydraulic fracturing deep underground, but from well-integrity problems such as poor casing and cementing.

"We can tell that the contamination derived from leaking of the shale gas wells, and therefore if those leaks could be fixed and corrected, this contamination could be avoided and stopped."

The sampling was conducted in 2012 and 2013 on 20 wells overlying the Barnett shale in Texas.

Vengosh says this study was unique because it employed a combination of noble gas and hydrocarbon tracers, allowing the researchers to distinguish between the signatures of naturally occurring methane and stray gas contamination from drill sites.

"We are trying to understand based on the best available scientific tools," says Vengosh. "We developed some new tools here, how we can do the correct monitoring for - and making sure that there are or are not in some cases - contamination."

The study, which also found the same issues with contaminated wells in Pennsylvania, is published in the Proceedings of the National Academy of Sciences.


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