Weston resolved an array of client RCRA Corrective Action obligations by providing comprehensive services for an automotive manufacturing company and its bonding firm. Faced with legacy environmental concerns from historical waste handling at burial sites, surface impoundments, wastewater treatment systems, leaking underground storage tanks, and degreasing units, and bound by a regulatory consent agreement, the client relied on Weston to effectively design and implement all phases of the required RCRA Facility Investigation and Corrective Action.
The project site is a former manufacturing facility along the Huron River where environmental contaminants affected soil, groundwater, and surface water. Weston applied multifaceted investigative and interim response strategies throughout the project, enabling the client to receive regulatory approvals during each Corrective Action phase. The release assessment and the nature and extent of contamination portions of the RCRA Facility Investigation included innovative soil gas testing methods, direct push technologies, vertical aquifer profiling, nested well installations, test pitting, remote camera surveys, and surface soil and surface water characterizations. Corrective Actions and Interim Measures comprised waste excavations coupled with soil vapor extraction using horizontal soil vapor extraction wells emplaced within the excavation prior to backfilling.
Weston successfully gained agency approval for a groundwater-surface water mixing zone determination, allowing the residual groundwater contaminants (following demonstrated contaminant reductions resulting from the Interim Measures) to be addressed with monitored natural attenuation and institutional controls, at a significant cost savings compared to alternative groundwater remediation methods. Throughout the Corrective Measures implementation phase, long-term declines of the groundwater plume strength were documented, as our team continued the groundwater monitoring program with agency-approved decreases in sampling frequencies and costs.
Beginning with significant environmental concerns stemming from heavy metals, volatile and semivolatile organic compounds, cyanide, and polychlorinated biphenyl releases across the facility, the Weston team addressed all of these client issues in a professional manner, providing financial, ecological, and human health risk reductions that effectively shortened the overall lifecycle of the project, enabling the client to focus on its core business functions.