1st federal study finds natural gas fracking chemicals didn’t spread - The Washington Post: " . . . Drilling fluids tagged with unique markers were injected more than 8,000 feet below the surface at the gas well bore but weren’t detected in a monitoring zone at a depth of 5,000 feet. The researchers also tracked the maximum extent of the man-made fractures, and all were at least 6,000 feet below the surface. That means the potentially dangerous substances stayed about a mile away from surface drinking water supplies, which are usually at depths of less than 500 feet. “This is good news,” said Duke University scientist Rob Jackson, who was not involved with the study. He called it a “useful and important approach” to monitoring fracking, but he cautioned that the single study doesn’t prove that fracking can’t pollute, since geology and industry practices vary widely in Pennsylvania and across the nation. The boom in gas drilling has led to tens of thousands of new wells being drilled in recent years, many in the Marcellus Shale formation that lies under parts of Pennsylvania, New York, Ohio and West Virginia. That’s led to major economic benefits but also fears that the chemicals used in the drilling process could spread to water supplies. . . ."(read more at link above)
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