Blackwell Zinc Site – Groundwater Remediation

Blackwell Zinc Site – Groundwater Remediation Blackwell Zinc Site—Groundwater Remediation OUR CHALLENGE A former zinc smelter operating from 1916 to 1974 released zinc and cadmium sulfate solutions to the surficial alluvial aquifer soil and groundwater. The former facility was located immediately adjacent to and...

Alaska LNG Sediment Modeling

Alaska LNG Sediment Modeling Alaska LNG Sediment Modeling OUR CHALLENGE Alaska LNG has proposed constructing a pipeline from the North Slope to Cook Inlet that would deliver natural gas for commercialization and in-state distribution.  In accordance with the requirements of the National...

Douglas Harbor Dredging: Alaska

Douglas Harbor Dredging: Alaska Douglas Harbor Dredging: Alaska OUR CHALLENGE In Douglas Harbor, Alaska, a planned harbor renovation required dredging and placement of approximately 30,000 cubic yards of mercury-contaminated sediment in a disposal site at nearby Gastineau Channel.  To document...

Former DDT Manufacturing Facility Site Investigation: Oregon

Former DDT Manufacturing Facility Site Investigation: Oregon Former DDT Manufacturing Facility Site Investigation: Oregon OUR CHALLENGE DDT and related chemicals from historical pesticide manufacturing and other sources were found in river sediments at the Portland Harbor Superfund site.  Early in the project, little was known...

Deepwater Horizon—Information Management for NRDA: Louisiana

Deepwater Horizon—Information Management for NRDA: Louisiana Deepwater Horizon—Information Management for NRDA: Louisiana OUR CHALLENGE The Deepwater Horizon accident was unprecedented with regard to the volume and urgency of data to be collected, organized, shared, and evaluated.  A broad range of data types including in-water...

Stormwater Source Control: Willamette River, Oregon

Stormwater Source Control: Willamette River, Oregon Stormwater Source Control: Willamette River, Oregon OUR CHALLENGE At the inactive Arkema facility, part of the Portland Harbor Superfund site, DDT from past manufacturing remained in upland soil and was potentially vulnerable to transfer to the river via stormwater. ...

Berry’s Creek Study Area RI/FS: New Jersey

Berry’s Creek Study Area RI/FS: New Jersey Berry’s Creek Study Area RI/FS: New Jersey OUR CHALLENGE The Berry’s Creek Study Area is a 12-square-mile watershed located in the Hackensack River Meadowlands in New Jersey.  Historical industrial and urban development of the study area’s waterways and wetlands...

Lower Passaic River RI/FS: New Jersey

Lower Passaic River RI/FS: New Jersey Lower Passaic River RI/FS: New Jersey OUR CHALLENGE The Lower Passaic River has a long history of industrialization, leading to elevated levels of dioxin and other contaminants throughout the 17-mile study area.  The urban setting presents substantial engineering...

Natural Resource Damage Assessment of PFAS

Natural Resource Damage Assessment of PFAS Natural Resource Damage Assessment of PFAS OUR CHALLENGE Our client was faced with a state-led natural resource damage claim for per- and polyfluoroalkyl substances (PFAS) in groundwater, rivers, and lakes. OUR APPROACH We assessed damages using resource equivalency...