Excerpt:
The U.S. Coast Guard was working with state officials Saturday to determine the cause of a large oil slick in the waters off Santa Barbara County.

The 1½- to 2-mile sheen was spotted Friday about five nautical miles from Summerland Beach, an area with a petroleum-rich sea floor that is home to numerous abandoned gas and oil wells.

Early Saturday morning, a Coast Guard helicopter flew over the slick to look for clues as to its source, according to Petty Officer Matthew West.

“We are still waiting to hear back,” he said…