For over 15 years, BMT has supported cleanup of Areas of Concern (AOCs) at the U.S. Department of Agriculture’s (USDA) Beltsville Agricultural Research Center (BARC) in Maryland. One AOC, dubbed BARC 32, consisted of transformers containing polychlorinated biphenyls (PCBs) that had leaked PCB-containing fluids. Soil was contained other environmental contaminants, including pesticides, metals, and polynuclear aromatic hydrocarbons (PAHs).
BMT delineated contamination using a variety of investigation technologies that included historical aerial photography; sampling soil and groundwater using Geoprobe® direct push methods; and field immunoassays to produce real-time data that expedited the assessment and cleanup.
An expedited Time-Critical Removal Action (TCRA) was implemented to ensure that contaminants were removed and potential exposures were minimized. The removal action addressed over 800 tons of highly concentrated PCB wastes. In addition, over 8,000 tons of soil was sent to a Low Temperature Thermal Desorption (LTTD) facility to separate contaminants and allow the soil to be recycled.
BMT identified the presence of groundwater contamination with chlorinated volatile organic compounds (VOCs) consisting primarily of Tetrachloroethene (PCE). An important aspect of our work is the development of groundwater treatment options. BMT evaluated several treatment technologies to reduce PCE levels in groundwater to acceptable levels, and developed an approach using a proprietary treatment technology using “OSorb®.”
Osorb® is a silica absorptive material used for the capture of a broad range of groundwater contaminants. Iron-Osorb® is a version of Osorb® which uses embedded micro iron to reductively dechlorinate chlorinated solvents such as PCE, trichloroethene (TCE), cis-1,2-dichloroethene (DCE), and vinyl chloride.
This approach was brought forward to ARS and EPA as a way to cost-effectively address PCE in groundwater. Bench tests demonstrated the ability of the Osorb® material to prevent further migration and reduce concentrations of PCE. BMT continues site monitoring.
BMT developed a 3D hydrodynamic and water quality model of the region around the Abrolhos Islands in Western Australia. In collaboration with BMT and the University of Western Australia, model results were used to assess the impact of proposed finfish aquaculture on the surrounding environment.
BMT was commissioned by the Abu Dhabi Environment Agency to undertake advanced numerical modelling at a site within the Arabian Gulf. This was to assess the viability of developing aquaculture operations at the site.
Following on from our role in assisting Stockland to carry out environmental assessments and obtain federal approval for the project, BMT has been responsible for the planning and design of the stormwater quality and flood risk management strategy for the Aura site as well as on-going surface and groundwater monitoring.
The Beaverdam Road Landfill (BDRLF) site is another site BMT characterized for the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) at the Beltsville Agricultural Research Center (BARC) in Maryland. BMT led a Remedial Investigation/Feasibility Study that included site investigation, development of a Site Screening Process, ecological risk assessment, human health risk assessment, and feasibility study to evaluate remedial options.