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U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Remediation Technology Demonstration Project Profiles

Wyckoff/Eagle Harbor Superfund Site
Last Updated: August 24, 2011
Site Identifying Information                                                
Site Name, Location:   Wyckoff/Eagle Harbor Superfund Site, Puget Sound, Washington, United States
(EPA Region 10)
Cleanup Program:   Superfund Remedial
Entity Responsible for Cleanup:   Not Specified
Site Type:   Former Industrial Site
Government Affiliation:   Federal

 
Project Information                                                                   
Project Name:   Wyckoff/Eagle Harbor Superfund Site
Project Status:   Complete
Contaminants Treated:  
Chemical Name Conc. Units Comment
Mercury
Media Treated:  
Media Quantity Units Basis for Quantity
Sediment
Demonstration Technology and Type:   Monitored Natural Attenuation (In Situ Biological)
Demonstration Year:   2009
Year of Publication:   2009
Goal of the Demonstration:   The goal of the demonstration was to validate enhanced monitored natural attenuation as a means to reduce chemical concentrations in a biologically active zone of sediment that would enhance the potential for ecologically balanced recolonization. Specific remedial action objectives include reducing chemical concentrations in fish and shellfish, and achieving the State of Washington Sediment Quality Standards included 0.59 milligram/kilogram (mg/kg) for mercury in the top 10 centimeters of sediment within the first 10 years of remediation.
Design and Operations:   Enhanced monitored natural recovery (EMNR) included the placement of a 15 centimeter thin layer cap over the contaminated sediment that required remediation to reduce biological exposure or potential for sediment redistribution of sediment that exceeded the 0.59 mg/kg cleanup level but not the High Apparent Effective Threshold (HAET) level of 2.1 mg/kg. The capping was placed in shallow water area with minimal bottom slope. The area for capping covered 4.5 acres and the installation took about 3 weeks.
Performance Data Relevant to Demonstration Goals:   Results from the 2005 sampling event (year 8) indicate a slight increase in mercury concentrations in surface sediment; however, this is believed to be due to multiple processes including deposition or mercury-enriched flocculent material from the water column (due to lateral transport from elsewhere in Eagle Harbor) and bioturbation.
Interesting Aspects or Significance of the Demonstration:   Not Specified
Lessons Learned:   Lessons learned indicate that the EMNR thin layer cap has been implemented successfully as part of the larger remedial remedy at the site and has remained stable for ten years. Recontamination has occurred; therefore, the importance of source control is heavily emphasized.
Other Demonstration Information (such as cost data, if available):   Due to the overlap of materials and mobilization for both the thin layer cap and the overall cap, costs could not be broken down. Monitoring results from 2005 indicated that there has been no evidence of cap failure or erosion; however, mercury concentration in surface sediments had increased slightly since the cap’s installation.
Information Source(s) for the Demonstration:   U.S. EPA Contaminated Site Cleanup Information’s "Technology Innovation News Survey." November 1-15, 2010.
http://www.clu-in.org/products/tins/

Contact Information                                                                      
Point(s) of Contact:   Victor Magar
Battelle Memorial Institute
Columbus, Ohio, United States
Telephone: 614-424-6424
  Jason Conder
ENVIRON Corporation
  Karen Merritt (Primary Contact)
ENVIRON Corporation
 

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