Unison/Union Carbide Site

Site Background

The KDHE-Bureau of Environmental Remediation (KDHE) is overseeing environmental investigation and remediation at the former Unison/Union Carbide site at 3126 Brinkerhoff Road within the Fairfax Industrial District of Kansas City, Kansas. The property consists of a vacant 14,000-square-foot warehouse building and attached two-story office area, wth paved and unpaved parking and loading areas to the east and north.

From 1983 to 1986, Environmental International Electrical Services, Inc. (EIES) used the facility to decontaminate and reclaim electrical transformers that had contained polychlorinated biphenyls (PCBs). The transformers were cleaned using a trichloroethylene (TCE), a chlorinated solvent. EIES reported a number of chemical releases and ultimately overhauled and improved its chemical-handling processes and storage. Unison obtained operating rights from EIES in 1988. A commercial re-permitting process was completed in late 1989, and the facility operated on a limited basis until 1991 when the facility was shut down, decommissioned, and equipment was removed from the warehouse. Unison reported no chemical releases while it operated the facility.

Although impacts to soil and groundwater associated with the former Unison facility are believed to have occurred prior to Unison's operations, Unison and its parent company, UCC, assumed the responsibility for cleanup and closure activities. In 1996, UCC entered into an agreement with KDHE to address TCE and degradation products present in site soil and groundwater.

Interim Remedial Measures

Starting in December 1992, PCB-contaminated materials were removed and properly disposed of. These materials included PCB-contaminated concrete from the warehouse floor and the underlying soils, as well as contaminated asphalt and soils from the exterior parking areas. The excavation and disposal of the PCB-contaminated material also removed the vast majority of the TCE-contaminated soils.

Groundwater contaminated with TCE was treated with a cometabolite-amended air sparging measure, which was highly successful in reducing the concentrations of TCE and its degradation products, except in areas where recalcitrant concentrations remained because they were out of the area of biosparge influence. These areas were treated with in-situ chemical oxidation if they were onsite, and with cometabolite-amended air sparging if offsite.

Corrective Action Study

The Corrective Action Study (CAS) identifies the preferred remedial alternative to address residual soil and groundwater contamination at the Site. KDHE will select a final remedy for the Site after reviewing and considering all information submitted during the 30-day public comment period that ran from October 2, 2018 through October 31, 2018. The CAS presents KDHE's preferred remedial alternative for the Site. KDHE may modify this alternative or select another response action based on new information and/or public comments.

Additional Information

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Site Documents