RI Data Gap Investigation, NAS North Island, CA
RI Data Gap Investigation, NAS North Island, CA
Trevet conducted an onshore and nearshore assessment and delineation of chlorinated volatile organic compounds (VOCs), semi-volatile organic compounds, per- and polyfluoroalkyl substances, metals, pesticides comprising a groundwater plume discharging into San Diego Bay. This highly complex project consisted of sediment, groundwater, and pore water investigations of the plume, which originates from a Naval Air Station (NAS) North Island former chemical disposal area, and assessment of risk to multiple receptors and media.
Groundwater samples from onshore wells and pore water samples from below the bay floor supported bench-scale treatability studies evaluating intrinsic bioremediation and assessing chlorinated solvent degradation using various amendments. Field activities included munitions and explosives of concern avoidance activities at 174 underwater stations adjacent to the weapons pier, offshore piezometers installation, high resolution passive profiler and SiREMs passive sampler deployment around the pier and the shoreline, sample collection using vibracore and Van Veen methodologies, cone penetration testing surveys, and eelgrass and invasive algae clearance surveys.
RI Data Gap Investigation, Installation Restoration Program Site 9, NAS North Island, CA
Field activities and tabulated data from the multiphase data gap investigation were documented in summary reports. Trevet also produced a DNAPL characterization report, a vertical salinity assessment report, and a natural degradation evaluation technical memorandum that delineated the nature, extent, and transformation of onshore and nearshore VOCs and evaluated natural degradation processes across the site.
“The integration of data from multiple sources over a period of almost 20 years resulted in a significantly improved understanding of site hydrogeology that aligned with the vast majority of previously collected data. This robust review resulted in consensus with regulatory agencies.” – NAVFAC Southwest
Have a project in mind?
Experience and Innovation for Lasting Results.
Contact TREVET today and discover how our team can provide innovative solutions to your civil and environmental challenges.
