Colorado oil and gas regulators are scheduled to take their first enforcement measures later this month against companies that fail to disclose chemicals used in hydraulic fracturing.
The Grand Junction Daily Sentinel reports that disclosure is part of a year-and-a-half-old rule.
Alleged violations involving at least 11 companies to date mostly involve a handful of wells, or in some cases a single well.
At its meeting at the end of the month, the Colorado Oil and Gas Conservation Commission is scheduled to take action against Noble Energy, Bill Barrett Corp., Marathon Oil, ConocoPhillips, Kerr-McGee, Gunnison Energy, Laramie Energy II, McElvain Energy, Synergy Resources Corp. and Orr Energy. It is expected to take action later against Encana.
Companies say many violations involve human error.