In the 1980s, the Environmental Protection Agency designated the former Anaconda Co. Smelter site and surrounding areas as Superfund sites—among the nation’s largest. Historic milling and smelting activities produced wastes that impacted the soil, groundwater, and surface water with elevated concentrations of arsenic, copper, cadmium, lead, and zinc. A confidential client engaged Woodard & Curran to evaluate remedial alternatives for over 30,000 acres of smelter-impacted soils at the site and develop remedial designs to treat impacted soils and limit transport to surface and groundwater receptors.
DETAILS OF THE ALTERNATIVE EVALUATION AND REMEDIAL DESIGNS
The alternative evaluation and design considers soil treatment or otherwise ameliorating impacted soils (removal, capping, in-situ treatment, vegetation improvement, steep slope remediation) in response to both human health action levels (primarily arsenic and lead) and vegetation phyto-toxicity soil effects concentrations for contaminants of concern (arsenic, cadmium, copper, lead, and zinc). Woodard & Curran designed, coordinated, and managed the implementation of numerous investigation projects for the collection of necessary data to develop the detailed remedial designs. Information collected included media-specific data, equipment feasibility evaluations and soil amendment requirements, and vegetation-related data. As part of this large-scale remediation project, the project team also designed a GIS database system to manage the efficient application of the tremendous volume of data obtained for the design efforts.
The remedial designs address specific performance criteria negotiated with state and federal regulatory agencies and meet all applicable environmental regulations. In addition, Woodard & Curran has performed remedial construction oversight for several of the EPA-approved designs.
