Groundwater tested in north-central Arkansas showed no signs of contamination by shale natural gas drilling, according to a study by the U.S. Geological Survey and Duke University. About 127 shallow drinking water wells in the Fayetteville Shale in the state were tested using isotopic tracers, a Duke release stated. "These findings demonstrate that shale gas development, at least in this area, has been done without negatively impacting drinking water resources," said Duke doctoral student Nathaniel Warner, the lead author of the study.

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