CITIZEN POWER ALLIANCE

Nationwide, concerns are especially acute over horizontal drilling -- which sometimes triple or quadruples the amount of frack fluid used -- and fracking in the deep Marcellus shale formations in New York, Pennsylvania and into the eastern third of Ohio.

One national environmental group recently rapped drilling companies nationwide for injecting toxic petroleum distillates into thousands of wells.

The Environmental Working Group focused on benzene -- a "known human carcinogen that is toxic in water at even minuscule levels," the report said -- found in some of the petroleum distillates used by drillers.

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