Accepted Reports

Responders perform well overall in drills in 2024

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Two fishing vessels pull boom behind them. Each boat is attached to one end of the boom so that when they move forward, the boom forms a curve. In this first image, the boats are parallel with each other so that the boom is in the shape of the letter U.

Many of the drills and exercises conducted by the industry last year went well, according to the latest drill summary released by the Council. During the 14 drills and exercises observed in 2024, responders were generally well-practiced and activities went smoothly. The summary report also contains suggestions for future exercises.

Tanker spill exercise

In October, Marathon Petroleum conducted a large exercise, simulating a spill of almost 3 million gallons of crude oil from a tanker into central Prince William Sound.

One goal of the exercise was to test how well responders transitioned command of the response from Alyeska’s Ship Escort Response Vessel System, or SERVS, to Marathon. Part of SERVS’ role in an oil spill is to initiate and manage the response activities until the company that owns the tanker arrives on the scene.

“The transition from Alyeska to Marathon was very well done,” says Roy Robertson, drill monitor for the Council. “The Marathon team members took the time to shadow SERVS’ team before the transition to learn the system and processes that are unique to our region.”

“Marathon also kept most of SERVS’ team around to provide support which has not always been done in the past,” Robertson added.

Three people surround a metal table in a shiny new facility with modern equipment. One of the three is directing the other two on otter cleaning techniques. The "otter" on the table is a stuffed toy.
A wildlife expert teaches Council staff members Donna Schantz and Joe Lally how to clean crude oil from an otter. A stuffed toy otter is used in these training sessions.

Terminal spill exercises

In 2024, Alyeska conducted several exercises that simulated a spill from the terminal. During one of these, Alyeska set up its new units for treating oiled wildlife such as otters and birds. These units contain state of the art equipment and can be set up quickly in the event of a spill.

Polar Tankers conducted emergency towing exercises

Polar Tankers led the pack in tanker towing exercises. The industry is required to perform one each quarter, although a total of five were conducted in 2024. The Council observed two of the five. Polar Tankers volunteered to conduct three.

“These exercises do add time to the tanker’s trip,” says Robertson. “But they provide valuable training for the crews.”

The report recommends rotating the exercises between the various shipping companies.

Protecting sensitive areas

Several exercises focused on tactics to keep oil away from shorelines or other areas that are particularly susceptible to damage from oil contamination.

This type of exercise is often held during the annual spill response training for fishing vessel crews. The small vessels that participate in these trainings would mostly be used in this capacity in a real incident.

Some areas to improve

The report included suggestions for improving future exercises, including:

  • More deployments of the new oil spill response barge, the Allison Creek, which replaced an older barge of the same name last year. The new barge is an improvement, but does have more equipment on its deck.
  • Practice response operations during reduced visibility. More than 5 years have elapsed since the last exercise was conducted in low visibility. The escort tugs have special equipment on board that improves responders’ ability to spot oil in these conditions.

2024 Annual Drill Report

More details and additional recommendations are available in the full report: 2024 Annual Drill Monitoring Report 

Study estimates emissions from 2022 incident

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A new Council report contains an estimate of crude oil vapors emitted during an incident at the Valdez Marine Terminal in 2022.

Damage from snow and ice during winter 2021-2022

Over the winter of 2021 to 2022, excessive snow and ice built up on top of the vast tanks that store crude oil at the terminal, damaging the pressure vacuum vents on many of the tanks. In some cases, the vents were completely sheared off. These vents control the internal tank pressures, preventing dangerous overpressure or vacuum conditions.

The image shows two photos. One is a distance shot of the storage tanks, which demonstrates how vast the tanks are. The second photo is a closeup of the vents, which are metal and stick up off of the top edge of the tanks.
Oil is stored in tanks until it can be loaded onto ships for transport. Each of the storage tanks can store over 21 million gallons of crude oil.
Pressure vacuum vents are located on the outside edge of the roof on each tank. (Larger image)

During normal tank operations, the internal tank pressure can vary. Oil levels inside the tanks increase or decrease, and other factors such as sunlight heating the tanks can affect the internal pressure.

When the tank vapor pressures get too high, the vents can open and release those vapors to the atmosphere. They also prevent too much oxygen from entering the tanks, which could lead to a fire or explosion.

Damage to the vents led to concerns about the release of crude oil vapors into the surrounding atmosphere and other dangers.

Evaluating the impact

In incidents like these, precise emission volumes are difficult to measure. However, estimates can be calculated using key data points. Last year, the Council hired Dr. Ron Sahu, a nationally respected expert in air quality and engineering, to do just that. By gaining a better understanding of the volume of emissions that was released, the Council hoped to better understand the potential effects on the environment of Port Valdez or nearby residents from this incident.

The Council provided Dr. Sahu with documents from Alyeska and data from the State of Alaska, acquired via public records requests. From these documents, he was able to determine key points such as:

  • The number of tank vents that were damaged.
  • The extent of damage to individual vents.
  • The time period between when the damages were discovered until vent repairs were made and when pressure management of the tanks stopped.
  • The amount of oil in each tank.

Dr Sahu also considered ambient conditions such as temperature, among other factors to complete his analysis.

Using special software developed by the U.S. Environmental Protection Agency that calculates air pollutant emissions from organic liquid storage tanks, Dr. Sahu conservatively estimated that between 79 to 193 tons of volatile organic compounds and hazardous air pollutants were released into the surrounding atmosphere from February through March 2022. Dr. Sahu emphasizes that his estimate is conservative, and that the total is likely higher. Among other factors, he only accounted for losses when the oil levels were not changing in the tanks.

He also provided input on Alyeska’s response to the incident, including areas to improve safety.

Alyeska disagrees with the estimate

Dr. Sahu used the best information that was available to the Council at the time of the report’s release. In preliminary feedback provided by Alyeska, they disagreed with the report’s calculations, noting that they believe the total emissions to be lower. The Council has requested additional information on what Alyeska believes to be inaccurate; however, Alyeska has so far declined to provide any more feedback, limiting the Council’s ability to address their concerns.

Read the report

The full report details Dr. Sahu’s calculations and how he arrived at his conclusions: Report on VOC Emissions from Snow Removal Incident at VMT in 2022

Pilot test evaluates testing methods for buried liners

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How do you detect damage underground? The Council, Alyeska, and the Alaska Department of Environmental Conservation, or ADEC, have been trying to answer that question. The results from a recent pilot test are providing direction to help ensure that oil will not leak through the secondary containment liners under the storage tanks at the Valdez Marine Terminal.

Finding flaws in an underground liner

Last summer, Alyeska conducted a pilot test for locating damage in the special asphalt liners that surround the crude oil storage tanks at the terminal.

The liners are part of a system surrounding the tanks that is designed to prevent oil from leaking into the environment. The liners are difficult to examine because they are buried under several feet of earthen fill. Digging them up for inspection is expensive, time-consuming, and historically has caused damage.

Since the liners were installed nearly 50 years ago, only a small percentage has ever been uncovered and evaluated for damage. When sections have been uncovered, holes or cracks have been found about 19% of the time.

Both Alyeska and the Council have been looking for a method that can determine whether there are cracks or faults in the liner, and if so, where they are located, without having to dig, per requirements set by ADEC.

Results from pilot test

Of the methods that were tested last July, electrical leak location was determined to be the most feasible. This type of survey is done by applying electric currents to the ground outside the liner and measuring electric currents on the surface of the fill inside the liner. A solid liner would block the currents. Holes or cracks would allow the current to flow through. The currents that flow through the liner can be detected from the surface, allowing technicians to create a map of damaged areas.

Further analysis to come

Alyeska conducted this pilot test in preparation for a larger-scale test. When approving the last update to Alyeska’s oil spill contingency plan, ADEC placed a condition on the plan’s approval, requiring that Alyeska conduct further analysis of the liner. The timeline for these additional tests is yet to be determined.

How much of the liner needs to be tested?

The Council hired Dr. Craig Benson, Distinguished Professor Emeritus of the University of Wisconsin-Madison, and Dr. Joe Scalia, Associate Professor of Civil and Environmental Engineering at Colorado State University, to weigh in on the pilot test results. They determined that when the large-scale testing is done, at least 20% of the liner needs to be examined to be able to confidently estimate the frequency and size range of defects in the liner.

Details in the report:

Find out more about the pilot test and the expert’s recommendations in the report:

Researchers find new non-native species in Prince William Sound

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Last year, researchers from the Smithsonian Environmental Research Center, or SERC, partnered with the Council to conduct the largest survey of non-native benthic marine invertebrate species in Prince William Sound since 2003.

The work is part of a larger survey being conducted by Dr. Gregory Ruiz and a team of researchers from SERC to document non-native species in ports and bays throughout the United States. The researchers have also recently surveyed in California, southeast Alaska, and other sites along the Pacific coast of the U.S. Researchers anticipate surveying Cook Inlet in 2025.

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