Mark Fischetti reports for Scientific American that, “Well water in Pennsylavania homes within a mile of fracking sites is found to be high in methane.”
From the report:
In Pennsylvania, the closer you live to a well used to hydraulically fracture underground shale for natural gas, the more likely it is that your drinking water is contaminated with methane. This conclusion, in a study published in the Proceedings of the National Academy of Sciences USA in July, is a first step in determining whether fracking in the Marcellus Shale underlying much of Pennsylvania is responsible for tainted drinking water in that region.
Robert Jackson, a chemical engineer at Duke University, found methane in 115 of 141 shallow, residential drinking-water wells. The methane concentration in homes less than one mile from a fracking well was six times higher than the concentration in homes farther away. Isotopes and traces of ethane in the methane indicated that the gas was not created by microorganisms living in groundwater but by heat and pressure thousands of feet down in the Marcellus Shale, which is where companies fracture rock to release gas that rises up a well shaft.
Most groundwater supplies are only a few hundred feet deep, but if the protective metal casing and concrete around a fracking well are leaky, methane can escape into them. The study does not prove that fracking has contaminated specific drinking-water wells, however. “I have no agenda to stop fracking,” Jackson says. He notes that drilling companies often construct wells properly. But by denying even the possibility that some wells may leak, the drilling companies have undermined their own credibility.
Samples have been taken for further testing, according to the report. Read more, click here.