FILE - In this May 1, 2009 file photo, offshore oil drilling 

FILE - In this May 1, 2009 file photo, offshore oil drilling platform 'Gail' operated by Venoco, Inc., is shown off the coast of Santa Barbara, Calif. Companies prospecting for oil off California’s coast have used hydraulic fracturing on at least a dozen occasions to force open cracks beneath the seabed _ and now oil and coastal regulators are investigating whether the practice should require a different permit from traditional drilling and be subjected to stricter environmental review. (AP Photo/Chris Carlson, file)
Associated Press
FILE - In this May 1, 2009 file photo, offshore oil drilling platform 'Gail' operated by Venoco, Inc., is shown off the coast of Santa Barbara, Calif. Companies prospecting for oil off California’s coast have used hydraulic fracturing on at least a dozen occasions to force open cracks beneath the seabed _ and now oil and coastal regulators are investigating whether the practice should require a different permit from traditional drilling and be subjected to stricter environmental review. (AP Photo/Chris Carlson, file)
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