HONOLULU (AP) — The U.S. Navy is investigating another spill near an underground fuel facility in Hawaii.

The Navy said in a statement about 14,000 gallons of fuel and water spilled from a drain line near the troubled Red Hill facility near Pearl Harbor over the weekend.

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The Navy reports that the water and fuel mixture were removed from the tunnel and put into a storage tank above ground by midday on Monday.

The Navy said there were no signs the fuel had escaped into the environment and drinking water was safe.

The facility has faced increasing scrutiny in recent years after a series of leaks. Earlier this month, Hawaii’s congressional delegation asked the Department of Defense’s inspector general to investigate the Navy’s handling of the facility.

A 2014 leak caused concern the facility could be contaminating Oahu’s drinking water.