03/18/2010 05:12 am ET Updated May 25, 2011

Frack-fluid tagging part of model Grand Junction, Palisade watershed plan

Using chemical tracers to make sure hydraulic fracturing fluids aren't contaminating groundwater supplies may be off the radar of Colorado officials who regulate the state's natural gas industry, but the concept is contained in what could be a precedent-setting plan crafted by the cities of Grand Junction and Palisade.

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