Remediation, Decommissioning, and Site Closure Done Right

Why iSi for Industrial Services in St. Louis

St. Louis has nearly 150 years of heavy manufacturing. Chemical plants, refineries, tanneries, metal finishing operations, and railroad yards have left subsurface legacies—soil contamination from petroleum, metals, and solvents; groundwater plumes from improper waste disposal; building materials contaminated with asbestos or lead. When companies acquire properties, expand facilities, or refinance loans, lenders and insurers require Phase I/II environmental site assessments (ESAs). Without proper assessment and remediation planning, buyers inherit multi-million-dollar cleanup liabilities.

iSi's industrial services team conducts Phase I ESAs (historical research, regulatory database review, site inspection) and Phase II ESAs (soil and groundwater sampling). We quantify contamination, assess risk to human health and groundwater, and determine Missouri DNR notification requirements. When contamination is confirmed, we design remedial action workplans—cleanup approaches that minimize disruption to ongoing operations or allow safe facility closure. We manage vapor intrusion assessments, soil excavation, groundwater treatment systems, and long-term monitoring. For sites with complex contamination histories, we navigate Missouri's remediation program and coordinate with DNR regulators.

Facility decommissioning is equally complex. Chemical manufacturers, aerospace contractors, and pharmaceutical facilities have specialized equipment, hazardous materials inventories, and regulatory obligations. We conduct hazardous material surveys to identify asbestos, PCBs, lead, and hazardous chemicals. We coordinate disposal with licensed hazardous waste contractors. We remove or salvage equipment. We perform post-closure environmental sampling and prepare closure documentation for Missouri DNR. We manage the process to minimize operational disruption and regulatory risk, protecting your exit from aging facilities.