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CIVIL & ENVIRONMENTAL

US Navy - SWDIV
Groundwater Remedial Investigation/Feasibility Study

Project Background
ERRG has prepared draft and draft final versions of an RI/FS report for groundwater contamination underlying NAS Alameda Site 25 and Alameda Annex IR Site 02. The project involved synthesizing site characterization efforts performed over the past 10 years, updating the human health risk assessment, and evaluating site remediation alternatives for a benzene and naphthalene plume, which underlies a residential neighborhood, an elementary school, and a day care center. The project has involved the detailed analysis of biosparging and monitored natural attenuation, the two technologies selected to form the recommended remedial alternative, and interaction with the regulatory agencies and local community.

The site investigations performed over the past 10 years have provided extensive characterization data, but lacked a uniform strategy for identifying and eliminating chemicals of potential concern. Through extensive background research and database queries, ERRG was able to concisely summarize the previous investigation data to successfully demonstrate that sufficient data existed to make a remedial decision that is protective of human health and the environment.

The presence of residential housing, a school and day care facility at the site has resulted in increased public scrutiny of the project. ERRG has worked closely with the Navy to discuss and resolve technical concerns raised by the agencies and public during the document review process. This included presenting at Base Closure Team and Restoration Advisory Board meetings, and preparing a fact sheet describing the biosparging alternative.