This past November, the Alaska Department of Environmental Conservation, or ADEC, approved the renewal of the oil spill contingency plan for the Valdez Marine Terminal. The approval came with conditions.
The plan, created and managed by Alyeska Pipeline Service Company, describes how the company plans to prevent spills from the terminal in Valdez, and how they would contain and clean up oil in case prevention measures fail. The approval followed several rounds of public comment, which began in 2023, and is subject to several conditions. This means the plan is tentatively approved, but there are required steps that must be taken for the approval to be valid.
As one of the conditions, ADEC is requiring that Alyeska conduct further analysis of the secondary containment liners underneath the crude oil storage tanks at the terminal’s East Tank Farm. These liners, made up of catalytically-blown asphalt, are part of a system that is intended to contain oil in the event of a spill, preventing contamination of surface and groundwater.
The liners are hard to inspect because they are covered with five feet of ground material.
Credit for a solid liner
Alyeska receives a 60% “prevention credit” from ADEC based on the integrity of these liners. This credit allows Alyeska to plan for a smaller spill, thus reducing the amount of equipment and responders that are listed in the plan to begin a quick response.
The credit is contingent upon the asphalt liner meeting ADEC’s “sufficiently impermeable” standard. This standard is based on a formula that determines whether the liner is solid enough that it can contain spilled oil until it is detected and cleaned up. Cracks and damage have previously been discovered in some areas when the liner has been exposed.
Request for public review of test results
In a November letter to the department, the Council requested that ADEC allow a public review of any changes that result from Alyeska’s analysis of the liner. The Council also requested the addition of a deadline for the analysis and corrective actions if the analysis finds that the liner is not sufficiently impermeable to meet ADEC’s standard. ADEC issued a decision that imposed deadlines for completion of the liner evaluation by 2028. The department did not include a public review or corrective actions.
Future updates
These plans are required to be updated every five years by industry and submitted for public review. This update to the terminal plan expires in 2029.
How and why do contingency plans change over time? Read a 2021 Council-sponsored report on how the plan for a spill from tankers developed over the years:
Every five years, this oil spill contingency plan is renewed. The process starts with Alyeska, who updates the plan to include new technology or lessons learned during drills. A renewed plan is effective for five years, when the cycle will be repeated. This process ensures that the preparations for preventing and responding to oil spills will continue to improve.
