Toxic Contamination From Natural Gas Wells -map - Interactive Feature - Pa example

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Toxic Contamination From Natural Gas Wells

The New York Times collected data from more than 200 natural gas wells

in Pennsylvania. Many of them are tapping into the Marcellus Shale, a

vast underground rock formation. But a method being used to stimulate

wells, called hydraulic fracturing, produces wastewater containing

corrosive salts and radioactive and carcinogenic materials. In

Pennsylvania, this wastewater has been sent through sewage treatment

plants that cannot remove some of the contaminants before the water is

discharged into rivers and streams that provide drinking water. The

Times was able to map 149 of the wells.

http://www.nytimes.com/interactive/2011/02/27/us/natural-gas-map.html