The Coast Guard says cleanup crews with skimmers are removing heavy fuel that spilled when a barge overflowed as it was being filled at a terminal in Port Angeles.

Petty Officer Shawn Eggert says the work may continue into Thursday. A 25-foot Coast Guard boat is keeping other marine traffic at least 500 yards away to prevent wakes that could spread the fuel.

The state Ecology Department says the fuel was contained in a boom set up as a precaution at the Tesoro Port Angeles terminal. At total of 840 gallons overflowed early Wednesday from a barge owned by Harley Marine Services.

Cleanup crews were dispatched from Global Diving and Salvage and the Marine Spill Response Corp., which maintains a pollution response ship in Port Angeles Harbor.