BP's Record:

August 2006 Prudhoe Bay Shutdown
In August, 2006, BP shut down oil operations in Prudhoe Bay, Alaska, due to corrosion in pipelines leading up to the Alaska Pipeline. BP had spilled over one million litres of oil in Alaska's North Slope.<44> This corrosion is caused by sediment collecting in the bottom of the pipe, protecting corrosive bacteria from chemicals sent through the pipeline to fight this bacteria. There are estimates that about 5,000 barrels (790 m3) of oil were released from the pipeline. To date 1,513 barrels (240.5 m3) of liquids, about 5,200 cubic yards (4,000 m3) of soiled snow and 328 cubic yards (251 m3) of soiled gravel have been recovered. After approval from the DOT, only the eastern portion of the field was shut down, resulting in a reduction of 200,000 barrels per day (32,000 m3/d) until work began to bring the eastern field to full production on 2 October 2006.<45> In May 2007, the company announced another partial field shutdown owing to leaks of water at a separation plant. Their action was interpreted as another example of fallout from a decision to cut maintenance of the pipeline and associated facilities. <46>

October 2007 Prudhoe Bay spill
On 16 October 2007 Alaska Department of Environmental Conservation officials reported a toxic spill of methanol (methyl alcohol) at the Prudhoe Bay oil field managed by BP PLC. Nearly 2,000 gallons of mostly methanol, mixed with some crude oil and water, spilled onto a frozen tundra pond as well as a gravel pad from a pipeline. Methanol, which is poisonous to plants and animals, is used to clear ice from the insides of the Arctic-based pipelines.<47>