Remedial Investigation/Feasibility Study, Proposed Plan, and Record of Decision for Parcel E-2

Hunters Point Naval Shipyard, San Francisco, California

ERRG conducted a remedial investigation/feasibility study (RI/FS) for the closed industrial landfill and surrounding areas (Parcel E-2) at Hunters Point Naval Shipyard in San Francisco, California for the U.S. Navy. ERRG integrated more than 20 years of investigations and removal actions into a comprehensive view of current environmental conditions and worked closely with several Navy contractors who were performing active remediation on the site. This multi-million dollar effort spanned 6 years and addressed the complex technical issues of a former industrial landfill located adjacent to San Francisco Bay. The project also required coordination with numerous stakeholders, including highly involved regulatory agencies and community members.

ERRG prepared an RI/FS Report to delineate the nature and extent of contamination at the site, including risk assessments, fate and transport analyses, and groundwater modeling to evaluate potential impacts of groundwater contamination to San Francisco Bay. The RI identified the following affected areas which pose potential threats to humans and wildlife: solid waste and soil in the landfill and surrounding areas, landfill gas, groundwater beneath the site, surface water runoff, and shoreline sediment.

To evaluate the feasibility of cleanup alternatives, ERRG performed groundwater modeling to simulate conditions for several possible groundwater response actions. ERRG then developed and evaluated a focused set of remedial alternatives. During the FS, detailed cost estimates were prepared for each remedial alternative, which were evaluated against the nine criteria established in the National Contingency Plan. The preferred alternative to address contaminated soil, sediment, landfill gas, groundwater, and soil was presented in the Final RI/FS and in the Proposed Plan and Record of Decision (ROD).

ERRG prepared the Final ROD, where the selected remedy to address contaminated soil, shoreline sediment, landfill gas, and groundwater was approved by the Department of the Navy, U.S. Environmental Protection Agency, Department of Toxic Substances Control, and San Francisco Regional Water Quality Control Board.