Resource Conservation and Recovery Act (RCRA) Corrective Action Program
Trihydro provides ongoing environmental services to address chlorinated solvent impacts at an industrial facility, including regulatory compliance and groundwater remediation.
Trihydro is performing ongoing work at a site under the United States Environmental Protection Agency (USEPA) and New Jersey Department of Environmental Protection (NJDEP) oversight and the requirements of a USEPA Hazardous and Solid Waste Amendments (HSWA) permit. The work is being performed to address extensive chlorinated solvent impacts in soil, bedrock, and groundwater.
Trihydro designed and implemented a complex site investigation to delineate the extent of impacts in groundwater at six solid waste management units (SWMUs) and three Areas of Concern (AOCs). Over 80 monitoring wells were installed and sampled in three water-bearing zones including fractured bedrock. Multiple dissolved-phase chlorinated solvent plumes extending off site from the facility were delineated. The vapor intrusion to the indoor air pathway was investigated in three off-site buildings and was dismissed. Extensive well-to-well aquifer testing was performed to map out fracture interconnection and delineate a stacked sequence of five water-bearing bedding-plane fractures controlling plume migration in the bedrock. Trihydro’s thorough evaluation of geologic and hydrogeologic conditions at the site and integration into a detailed conceptual site model (CSM) clarified the understanding of site conditions.
Trihydro is guiding the remediation phase of work toward a final remedy that will cap and leave residual impacts in place and control groundwater through a sitewide groundwater extraction and treatment system. The system includes bedrock groundwater extraction and provides hydraulic control of groundwater contamination, treatment of extracted groundwater to remove volatiles and inorganics, and discharge of treated water under permit to the municipal sewer system. Optimization of the treatment system was conducted after 20 years of operation, which focused on eliminating an inorganic treatment circuit, upgrading telemetry and automation, and replacing a high-maintenance packed tower air stripper with a smaller, tray-style indoor unit.
Ongoing work at the site includes routine monitoring and reporting, an ecological risk assessment, on- and off-site soil delineation events, and sentinel monitoring well installation. These events are being completed as part of remedial investigation and action efforts.
