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An inside look at the science of cleaning up and fixing the mess of marine pollution

Four Years and $44 Million Later: Restoring San Francisco Bay After the Cosco Busan Oil Spill

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This is a post by Greg Baker, a scientist with NOAA’s Office of Response and Restoration.

Cosco Busan ship with Bay Bridge.

The M/V Cosco Busan leaves the San Francisco Bay on Dec. 20, 2007, after hitting the Bay Bridge on Nov. 7. Credit: Jonathan R. Cilley, U.S. Coast Guard.

The infamous fog of San Francisco was thick and gray the morning the Cosco Busan cargo ship crashed into the San Francisco-Oakland Bay Bridge. It was November 7, 2007, and within seconds of the crash, 53,000 gallons of fuel oil were released into the surrounding waters. One of the largest oil spills in the history of San Francisco Bay, it set into motion a series of events that ultimately led to this week’s historic $44.4 million settlement [PDF] with the companies responsible for the spill (Regal Stone Limited and Fleet Management Limited).

To the public, this $44.4 million means there will be money for bird, fish, and habitat restoration in the bay. It will enhance shoreline parks and outdoor recreation throughout the Bay Area, helping compensate the public for the lost visits to the beach when oil washed up on the shores. This settlement will resolve all outstanding legal claims for natural resource damages, paying for the damage assessment, remaining cleanup costs, and for restoration of natural resources from the spill.

That first morning, we didn’t really know how much oil had been spilled—initial reports indicated it was only a small amount. But as the fog lifted, it quickly became apparent that oil was spreading over a large expanse of the bay [leaves this blog]. When I got the initial call about the spill, I had just landed in southern California to work on my major project at the time, which would soon be pushed aside. My coworker on the phone suggested I get back to the Bay Area as soon as possible. For the next several weeks I worked long hours alongside fellow scientists to quickly organize and conduct the field work to evaluate natural resource damages from the Cosco Busan oil spill [leaves this blog].

Cosco Busan with Coast Guard boat.

A U.S. Coast Guard boat approaches the gash in the side of the Cosco Busan, which released 53,000 gallons of bunker oil into San Francisco Bay. Credit: U.S. Coast Guard.

The type of oil that gushed into San Francisco Bay was bunker oil, which is commonly used to propel large ships and is different from crude oil or refined fuels. Bunker fuels are so viscous (thick and slow-moving) that they actually have to be heated to over 100 degrees Celsius (212 degrees Fahrenheit) in order to flow to ship engines.

As the thick bunker oil spread on the waters surrounding San Francisco, it turned into tarry patches and balls that eventually stranded along hundreds of miles of shoreline. Much of our understanding about the toxic effects from oil spills comes from studies of crude oil, conducted after the 1989 Exxon Valdez spill. But as we studied the effects of bunker oil on fish and wildlife after the Cosco Busan spill, we discovered bunker oil not only behaves differently than crude oil in the environment, but it appears to have different toxicological effects.

Two to three months after the spill, when the huge annual schools of Pacific herring entered San Francisco Bay to find their shallow spawning grounds, most of the evidence of lingering bunker oil was already gone, either cleaned up or weathered away. But when we collected herring eggs from areas both affected and unaffected by the spill, we made a remarkable discovery: Almost all of the eggs collected from spill locations were dead or deformed. The eggs collected outside of the spill zone were largely normal. This was especially surprising given the lack of significant remaining evidence of bunker oil.

We conducted additional studies over two more seasons of herring spawning in the bay and eventually concluded that the toxic characteristics of the bunker oil from the Cosco Busan spill affected as much as a quarter of the herring spawning in 2008. We also concluded that the effects didn’t carry over past that first spawning season after the spill. Our studies, directed by scientists from NOAA’s Northwest Fisheries Science Center and the Bodega Marine Laboratory in California, forged new scientific understandings on the effects of oil spills on aquatic resources and will guide further progress on our assessment of present and future spills.

This week at the announcement of the $44.4 million spill settlement, I had a moment to reflect on the countless hours of work that culminated in that press conference and the road to restoration of San Francisco Bay: from the emergency responders cleaning up the oiled waters (and the thank-you cards to them from local school kids left on the beach [PDF]) to the attorneys poring over the maritime and clean water laws violated by the spill.

Just two short hours before the press conference we still hadn’t received word that the settlement was filed in court. But then the message came, the last piece of the puzzle finally fell into place, and we were ready to unveil the whole, hopeful picture to the public.

The draft Damage Assessment and Restoration Plan for the Cosco Busan oil spill provides details on the restoration projects being planned; you can review it here [leaves this blog]. The public may submit comments on the plan through October 31, 2011.

Greg BakerGreg Baker works as an Environmental Scientist in the Assessment and Restoration Division of NOAA’s Office of Response and Restoration and is based in the San Francisco Bay Area.

Author: Office of Response and Restoration

The National Ocean Service's Office of Response and Restoration (OR&R) provides scientific solutions for marine pollution. A part of the National Oceanic and Atmospheric Administration (NOAA), OR&R is a center of expertise in preparing for, evaluating, and responding to threats to coastal environments. These threats could be oil and chemical spills, releases from hazardous waste sites, or marine debris.

One thought on “Four Years and $44 Million Later: Restoring San Francisco Bay After the Cosco Busan Oil Spill

  1. Pingback: Four Years and $44 Million Later: Restoring San Francisco Bay after the Cosco Busan Oil Spill (via Response and Restoration Blog) « Psilomelane

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