DENVER
03/14/2011 10:22 am ET Updated May 25, 2011

Niobrara Shale Formation May Be Chosen By EPA To Study Effects Of Fracking

The U.S. Environmental Protection Agency might use oil and gas development tapping the Niobrara shale formation near Cheyenne, Wyo., as a case study in an investigation of the overall environmental and public health impacts of hydraulic fracturing, or "fracking."

Fracking is a technique used by energy companies to fracture underground rock formations, releasing oil and gas. The technique usually requires an often-proprietary cocktail of water, sand and chemicals that many fear could threaten public health and contaminate groundwater and domestic water wells.

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