Two federal agencies issued an order Wednesday to ensure that Plains All American Pipeline finishes the cleanup of what they call the largest coastal oil spill in California in 25 years.

The Environmental Protection Agency and the Coast Guard issued the joint Clean Water Act order to ensure the cleanup of heavy crude on land, at the shoreline and in the ocean, to contain the oil and to prevent further contamination.

Representatives from the two agencies said at a news conference that such an order is common in spills and is not in response to any inaction by Plains All America.

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