A Hundred Years of Silent Oil Leaks: Gulf of Mexico

Containment Dome for Arctic Challenger, 2012. Image from wikipedia

A decade-old oil leak where an offshore platform toppled during a hurricane could continue spilling crude into the Gulf of Mexico for a century or more if left unchecked, according to government estimates obtained by The Associated Press that provide new details about the scope of the problem.  Taylor Energy Company, which owned the platform and a cluster of oil wells, has played down the extent and environmental impact of the leak. The company also maintains that nothing can be done to completely eliminate the chronic oil slicks that often stretch for miles off the coast of Louisiana….

Federal regulators suspect oil is still leaking from at least one of 25 wells that remain buried under mounds of sediment from an underwater mudslide triggered by waves whipped up by Hurricane Ivan in 2004….A Taylor contractor drilled new wells to intercept and plug nine wells deemed capable of leaking oil. But a company official has asserted that experts agree the “best course of action … is to not take any affirmative action” due to the risks of additional drilling…

The AP’s review of more than 2,300 Coast Guard pollution reports since 2008 showed a dramatic spike in sheen sizes and oil volumes since Sept. 1, 2014. That reported increase came just after federal regulators held a workshop August 2014 to improve the accuracy of Taylor’s slick estimates and started sending government observers on a Taylor contractor’s daily flights over the site.

Presented with AP’s findings, the Coast Guard provided a new leak estimate that is about 20 times greater than one recently touted by the company. In a February 2015 court filing, Taylor cited a year-old estimate that oil was leaking at a rate of less than 4 gallons per day.

A Coast Guard fact sheet says sheens as large as 1.5 miles wide and 14 miles long have been spotted by Taylor since the workshop. Since last September, the estimated daily volume of oil discharged from the site has ranged from roughly 42 gallons to 2,329 gallons, with a daily average of more than 84 gallons.,,, Based on satellite imagery and pollution reports, the watchdog group SkyTruth estimates between 300,000 and 1.4 million gallons have spilled from the site since 2004, with an annual average daily leak rate between 37 and 900 gallons.

Ken Arnold, an industry consultant, said natural oil seeps from cracks in the seabed can last for thousands of years. But he has never heard of another commercial oil spill lasting more than a decade, let alone a century.

In 2008, Taylor set aside hundreds of millions of dollars to pay for leak-related work as part of a trust agreement with the Interior Department. The company says it has spent tens of millions of dollars on its efforts to contain and halt the leak, but it hasn’t publicly disclosed how much money is left in the trust. The company sold all its offshore leases and oil and gas interests in 2008, four years after founder Patrick Taylor died, and is down to only one full-time employee.

Justice Department officials say the company approached the government concerning the trust fund, but they declined to discuss the terms of its proposal. Federal agencies responded that more work needed to be done, including installing a more effective containment dome system, and that the company remained responsible for doing that work, the officials said.

Oil leak that began after 2004 storm could last a century, U.S. says, Chicago Tribune, May 15, 2015

 

 

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