In the story “Pennsylvania Putting the Pressure on Marcellus Gas Drilling” (see Daily GPI, June 30), NGI said that the Associated Press (AP) had reported that a list of chemicals used in hydraulic fracturing operations being compiled by the Pennsylvania Department of Environmental Protection (DEP) would include compounds associated with neurological problems or other serious health effects. DEP now says that the list AP used included all chemicals used at well sites, not just in fracing operations, the AP said Thursday.

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