• Remediation cost estimates and regulatory documents prepared
• TSCA performance-based abatement of PCB-impacted caulking in concrete floors and doors/windows
• Hazardous materials also included ACM and LBP
• Oversaw excavation, chlorinated-solvent remediation, and hazardous soil and groundwater disposal
• Subslab ventilation system designed
Challenge
GZA supported the redevelopment of a former manufacturing property, where an existing 450,000-square-foot building was demolished to enable construction of an 800,000-plus-square-foot distribution warehouse. More than a century of industrial use had left soil and groundwater impacted by petroleum and chlorinated solvents, while the existing building contained hazardous materials including lead-based paint (LBP), asbestos-containing materials (ACM), and polychlorinated biphenyls (PCBs). Vapor-intrusion controls were also required for the redevelopment.
Solution
GZA developed preliminary remediation cost estimates; prepared regulatory plans for utility installation, targeted chlorinated-solvent remediation, and broader construction activities; and provided full-time construction oversight. A focused PCB sampling program identified affected floor joints, window frames, and door frames. By isolating and removing impacted caulking rather than removing entire floor slabs, GZA reduced bulk concrete removal by 80 percent, maximizing onsite reuse and limiting disposal costs.
During targeted remediation, GZA discovered an underground container holding nearly pure trichloroethylene, the source of historic solvent impacts. GZA designed and implemented removal of the container and surrounding soil, managed hazardous soil and groundwater, screened excavated materials, and coordinated dewatering and groundwater re-infiltration. Risk-based soil evaluation allowed thousands of tons of material to remain onsite, saving the client more than $500,000, while on-site groundwater treatment saved nearly $100,000. GZA also designed a subslab ventilation and vapor-barrier system to protect future occupants and implemented a TSCA performance-based abatement of PCB-impacted caulking in concrete floors and doors/windows.
Benefit
The integrated approach advanced regulatory compliance, reduced waste, controlled costs, and supported safe, efficient redevelopment of this complex industrial property.