Oil Spill Response

Report identifies concerns with tanker escort tugs being built for service in Prince William Sound

The council has identified some areas of concern with the design of the new escort and general purpose tugs under construction by Edison Chouest Offshore for use in Prince William Sound. These concerns and recommendations result from a council-commissioned analysis of the tugs by Robert Allan Ltd., a naval architecture and marine engineering company.

Edison Chouest Offshore is taking over the marine services contract for Alyeska Pipeline Service Company in the summer of 2018. Crowley Maritime has held the contract since the creation of Alyeska’s Ship Escort/Response Vessel System after the Exxon Valdez oil spill. The services provided under this contract include escort tugs, general purpose tugs, oil recovery storage barges, and associated personnel, all of which are key oil spill prevention and response assets for the Valdez Marine Terminal and associated oil tankers operating in Prince William Sound. Robert Allan Ltd. was contracted by the council to review and evaluate drawings and other vessel design materials provided by Alyeska Pipeline Service Company. This review includes information that was provided to the council as of December 14, 2016.

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Vessel construction, planning underway for Crowley to Edison Chouest transition

Council conducting independent review of vessel designs

This Alyeska chart compares some of the capabilities and specifications of the new vessels to the current fleet. The council is independently analyzing the vessels’ design specifications. Image courtesy of Alyeska.
This Alyeska chart compares some of the capabilities and specifications of the new vessels to the current fleet. The council is independently analyzing the vessels’ design specifications. Image courtesy of Alyeska. (CLICK PHOTO FOR LARGER IMAGE.)

By July of 2018, Edison Chouest Offshore, or ECO, of Louisiana will be the marine services contractor for oil tankers and the terminal in Prince William Sound. Until then, Alyeska and ECO will be working with Crowley Maritime, the contractor who currently provides those services, on a smooth transition between the two contractors. These services include escort tugs, general purpose tugs, oil recovery storage barges and associated personnel, all of which are key oil spill prevention and response assets for Prince William Sound. For instance, two state-of-the-art escort tugs accompany every laden tanker that leaves Port Valdez. One tug is tethered through the confined waterway called the Valdez Narrows, and one tug stands by at Hinchinbrook Entrance until the tanker is 17 miles into the Gulf of Alaska. The primary responsibility of these escort tugs is to rescue or “save” a tanker that may experience problems and prevent oil from spilling, and initiate response efforts should these prevention measures fail.

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New plan for using dispersants in Alaska is in effect

The Alaska Regional Response Team, or ARRT, established a new plan earlier this year for how oil spill dispersants, an alternative oil spill response option, would be used during an oil spill. The ARRT is a group of federal and state agencies that share responsibilities for managing oil and chemical spill responses in Alaska.

Mechanical response, such as booms and skimmers that actually remove oil from the water, is the priority response option by state and federal law.

The new plan was effective January 27, 2016, although parts of the plan will not go into effect until 2018.

Details of new plan

The new plan describes two different processes for dispersant use. Dispersants will be “preauthorized” in certain areas, and all other areas are “undesignated.”

A new “preauthorization area” will go into effect in 2018. This area extends from 24 nautical miles offshore out to 200 nautical miles offshore (approximately 27.6 to 230 miles), south of Alaska’s mainland through the Aleutian chain. The ARRT’s rationale is that preauthorizing, or deciding before an oil spill occurs where chemical dispersants are allowed, could speed up response time. In the preauthorized area, dispersants are considered to be approved by government agencies before an oil spill happens. Therefore, the U.S. Coast Guard, as federal on scene coordinator, can decide to apply dispersants to a crude oil spill. Areas farther than 200 nautical miles from shore are international waters, and are not part of this plan.

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Council and partners plan test of spill surrogate for response training

By Jeremy Robida
Council Project Manager

A group of oil spill preparedness planners in Prince William Sound are working together to develop an improved method of training for oil spills. The council has been working for many years to find a suitable oil “surrogate” for spill response training. Surrogates are floating substances such as wood chips, peat moss, or other materials that would mimic an oil slick and have similar interactions with currents, tides, and winds, without harming the environment. A surrogate would provide a target for responders during training and exercises; something which physically interacts with boom and equipment and acts as a visual aid to help responders increase proficiency with gear and tactics.

Federal policies do not provide guidance for surrogates. Instead, local solutions are encouraged which can be tailored to fit each region’s particular environmental concerns.

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