A Guam shipyard was working with the U.S. Coast Guard, the Guam Environmental Protection Agency and a private cleanup company Tuesday night to fix a sinking dry dock and keep petroleum from spilling into the island’s main harbor, Coast Guard Sector Guam said.

The privately owned dry dock, known as both Machinist and Big Blue, began taking on water early Monday morning and the Guam Shipyard struggled for nearly two days to contain the situation on waterfront property it rents from U.S. Naval Base Guam.

By Tuesday evening, the Coast Guard said it had reviewed the shipyard’s plan to work with the petroleum cleanup company GRESCO and was overseeing a unified command of the cleanup between the shipyard and the EPA.

The Navy said it is not involved in the cleanup effort and referred all questions to Guam Shipyard.

“Guam Shipyard is working with the U.S. Coast Guard to ensure that all the diesel and waste oil is safely removed prior to raising the dry dock Machinist,” said Mathews Poten, president and chief executive officer of Guam Shipyard, in a prepared statement released by the Coast Guard.

The shipyard sits on the Apra Harbor waterfront and must be accessed through Naval Base Guam.

Poten said the shipyard has the equipment needed to remove all the diesel and waste oil contained on the dock.

The Coast Guard estimated a potential 83,000 gallons of wastewater — a mixture of oil or diesel with water — could be onboard.

“The primary concerns at this point are the safety of responders and mitigating the pollution threat,” said Capt. Thomas M. Sparks, commander of Coast Guard Sector Guam. “We are seeing cooperation between Guam Shipyard, GRESCO and Guam EPA in addressing these concerns.”

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