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

Remediation Technology Demonstration Project Profiles

Operable Unit B (OUB), Sinclair Inlet
Last Updated: August 24, 2011
Site Identifying Information                                                
Site Name, Location:   Bremerton Naval Complex, Bremerton, Washington, United States
(EPA Region 10)
Cleanup Program:   Superfund Remedial
Entity Responsible for Cleanup:   Navy
Site Type:   Naval Shipyard
Government Affiliation:   Federal

 
Project Information                                                                   
Project Name:   Operable Unit B (OUB), Sinclair Inlet
Project Status:   Complete
Contaminants Treated:  
Chemical Name Conc. Units Comment
Polychlorinated biphenyls (PCB)
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 (recovery) (EMNR) at reducing chemical concentrations in a biologically active zone of sediment that would enhance the potential for ecologically balanced recolonization. The remedial action objective was to reduce average surface sediment polychlorinated biphenyls (PCB) concentrations to below 3 milligram/kilogram (mg/kg) within ten years of remedy implementation.
Design and Operations:   The EMNR remedy included a thin layer cap of 15 to 20 centimeters over an area of 16 acres. Placement of the cap was done by positioning a split-hull barge over the target area to release medium sand as the barge moved across the site. The placement volume for the cap was 20,000 cubic yards.
Performance Data Relevant to Demonstration Goals:   Performance data from the 2007 monitoring event indicated a decline in PCB concentrations compared to a 2005 sampling event. Mercury concentrations were unchanged from the 2005 data.
Interesting Aspects or Significance of the Demonstration:   Not Specified
Lessons Learned:   Lessons learned include that placing long, low-relief ridges of sand in the capped area is an effective way to distribute the capped material. Because PCB concentrations have slowly declined, initially, there needs to be source control near the capped area; however, results between 2005 and 2007 indicate the possibility of meeting the 10-year remedial action objective.
Other Demonstration Information (such as cost data, if available):   The cap material cost an estimated at $4 per cubic yard.
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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