During 2010 – 2014, CMA supported a comprehensive pre- and post-cap assessment including surface water and porewater sampling, seepage measurements, sediment coring, infaunal biological sampling, and cap settling. The study was conducted under subcontracts to CH2M Hill and E2.

In 2006, a Trident sensor survey was conducted at the Dundalk Terminal, Baltimore Harbor, Maryland. The survey encompassed the entire perimeter of the terminal, including 57 primary stations and 17 supplementary stations identified during the field program. Trident results successfully delineated potential discharge zones where porewater samples will be collected in subsequent sampling events. The work was carried out under subcontract to CH2M Hill.

From 2008 to 2013 CMA has been working with the US Dept of Energy and Environmental Assessment Services to quantify migration of contaminants from the Hanford reservation to the Columbia River. CMA developed a 600 pound driving frame for use in the hard bottom, swift current environment of the Columbia. Using this frame and adapting existing trident deployment techniques, CMA was able to sample porewater over 1,000 locations from 2008-2014.

In 2004, CMA conducted a Trident survey at the Roebling Steel Superfund Site in New Jersey. The Trident survey mapped the entire perimeter of the site, including adjacent areas of the Deleware River and Crafts Creek. The purpose of the survey was to identify potential groundwater discharge zones. At this freshwater site, we relied on temperature contrast to successfully delineate potential discharge zones for over 160 stations at two subsurface depths.

From 2004-2014, CMA conducted an extensive Trident and UltraSeep assessment to identify and quantify groundwater discharge zones and rates in support of a Remedial Investigation at the Portland Harbor Superfund Site, Portland, Oregon. An extensive Trident sensor survey was successfully executed to identify potential discharge zones, encompassing over 400 stations. Trident porewater samples were subsequently collected at ~50 potential discharge zones.

During 2006, and extensive groundwater discharge assessment was carried out by CMA at the Hylebos Waterway, Washington. The assessment focused on quantification of discharge rates and chemical concentrations in previously identified groundwater discharge zones. UltraSeep groundwater discharge and sampling deployments were successfully conducted at 25 stations throughout the site. The results were evaluated to map the spatial distributions of both mean and tidal groundwater discharge.

In 2013 CMA conducted a Trident porewater investigation delineating potential zones of groundwater seepage at over 100 locations. In 2014, CMA is conducting UltraSeep investigations at 54 stations to quantify groundwater discharge at each of these locations. This work is being done under contract to Louis Berger Group and New York City.

During 2007, a Trident survey was conducted at Frog Mortar Creek, Baltimore, Maryland. The survey encompassed a reach of the creek adjacent to a suspected groundwater discharge zone. A Trident sensor survey consisting of 25 stations was used to identify potential discharge zones, where 9 Trident porewater samples were subsequently collected for chemical analysis. The study was conducted under subcontract to Tetra Tech NUS.

From 2010 - 2013, CMA conducted a groundwater discharge assessment at the US Steel Plant in Gary Indiana. The work encompassed a comprehensive field effort including Trident screening, Trident porwater sampling, surface water sampling, piezometer installations, drag probe surveys, UltraSeep surveys, and sediment sampling.

CMA conducted a modeling study to evaluate the potential for enhanced flushing of the Shelter Island Yacht Basin through the placement of engineered culverts. The study was conducted under subcontract to Weston.

During 2008 – 2010, CMA supported an effort to identify potential groundwater discharge zones, and collect surface water and subsurface porewater samples using the Trident Probe at stations adjacent to the site in Pere Marquette Lake and the Ludington harbor. The study was conducted under subcontract to CH2M Hill.

In 2012 – 2013, a detailed watershed loading, hydrodynamic, and water quality modeling assessment was conducted by CMA in support of the Loma Alta Slough Bacteria and Nutrient TMDL. The study was conducted under subcontract to the Southern California Coastal Water Research Project.