Long-Term Environmental Monitoring

The major environmental monitoring activities of the council are conducted through the long-term environmental monitoring project, known as LTEMP. This project has gathered data on the presence of hydrocarbons in sediments and mussels in the region since 1993.

The project quantifies the amount of hydrocarbons, provides a benchmark for assessing the ongoing impacts of routine tanker and terminal operations, and identifies physical and biological changes taking place in the region’s ecosystem.

Establishing consistent baseline data helps us identify and assess trends over time. This data would enable us to accurately assess oil recovery in the event of a future spill. Long-term environmental monitoring also provides a context for more site-specific studies and research.

View map of long-term environmental monitoring field sites:

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Mussels were selected as the indicator species for LTEMP because they are:

  • indicator species
  • important subsistence food
  • important prey of sea birds and sea otters
  • commonly found throughout Prince William Sound and downstream habitats

By law, the Valdez Marine Terminal is allowed to discharge the equivalent of one barrel of oil each day into Port Valdez. The council works both to prevent accidental releases and to understand how long-term low inputs of crude oil impact the ecosystem. The environmental monitoring initiated by council in 1993 is the only long-term hydrocarbon monitoring in Prince William Sound and the northern Gulf of Alaska.

Results from the council’s studies indicate a variety of sources of hydrocarbons in Prince William Sound including the Exxon Valdez spill in 1989, operations at the Alyeska terminal, combustion sources, boating and shipping activities, normal oil seepage or coal deposits, biological processes, and atmospheric fallout.

Generally, the hydrocarbon levels detected under LTEMP have been relatively low. The stations farthest from the Alyeska terminal show low hydrocarbon levels, while those closest to the terminal show higher levels. Concern over the hydrocarbon levels at the terminal prompted the council to add an additional sampling effort at the two Port Valdez stations in the fall of each year.

LTEMP results are summarized in a year-end report and periodically peer reviewed. The program underwent a full data analysis and summary in 1998. Results from a 2000 review of the two Port Valdez monitoring sites suggest that Alaska North Slope crude oil residues from the terminal’s ballast water treatment facility have accumulated in the port’s intertidal mussels.

A reduced sampling frequency for LTEMP began in FY2010, as provided for in a new sampling plan accepted by the Board at its January 2009 meeting following a full programmatic review begun in 2007. The new sampling plan requires one sampling session per year at the two Port Valdez sites and the Knowles Head site. Then, every fifth year all 10 sites will be sampled.

Importance of Adequate Baseline Data

The Cook Inlet Regional Citizens’ Advisory Council has its own environmental monitoring program, similar in scope to LTEMP. Together, the data produced by the two programs provide some of the only multi-year data for coastlines downstream from the most industrialized and populated areas in Alaska.

The growth in commercial and recreational use of the northern Gulf of Alaska increases the complexity of determining adequate baseline data. Prince William Sound’s sensitive coastal marine environments are experiencing increased pressures on what is already intense use. Evidence of this increase in pressure can be found in the growing numbers of large and small passenger cruise ship traffic, the extension of the longevity of the trans-Alaska pipeline and its shipping activity, the Whittier road access that is adding to the increase in numbers of visitors to Prince William Sound, state oil and gas lease sales, new ports, increases in recreational uses, and demands for new access to fishing sites

Fact Sheet

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Reports and Data

Please contact Joe Banta for more information.

Data

PWSRCAC Long-term (oil) Monitoring Program data from mussel tissues, intertidal and subtidal sediments from fixed monitoring sites in Prince William Sound, outer Kenai coast and Kodiak, Alaska, 1993-2009:

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Annual Long Term Environmental Monitoring Project Reports

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Other Reports

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LTEMP Field Site Photos


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