BROADKILL BEACH, Del. (AP) – An approximately 215-gallon oil spill has been discovered at a Delaware beach. The spill from an unknown source spanned three-quarters of a mile of upper Delaware Bay coastline, depositing much of the oil that came ashore in the sand at Broadkill Beach, the Department of Natural Resources and Environmental Control said in a news release Monday.

A reconnaissance flight determined the size of the spill.

Samples of the oil will be provided to the U.S. Coast Guard Tuesday to be analyzed for a “petroleum fingerprint” that might determine its source, the department said.

The department was also working with the Coast Guard’s environmental contractor to clean up the spill.

Copyright 2020 The Associated Press.

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