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The Cargill Flour Milling facility is located within the North Industrial Corridor (NIC) Site in Wichita, Kansas. In January 1998, during the NIC Remedial Investigation, the City of Wichita detected carbon tetrachloride at a concentration of 480 micrograms per liter (ug/L) in groundwater immediately downgradient of the facility. This concentration exceeds the U. S. Environmental Protection Agency (EPA) Maximum Contaminant Level (MCL) of 5 ug/L for this contaminant in groundwater. Cargill conducted a subsequent investigation, which identified 760 ug/L of carbon tetrachloride and 1,400 ug/L of chloroform in the groundwater on-site.

In 2003, Cargill and KDHE entered into Consent Order 02-E-0312. A source control investigation work plan was submitted and conditionally approved by KDHE March 5, 2003. Based on the source control investigation findings and subsequent groundwater monitoring results, KDHE requested that Cargill implement interim measures (IM) at the Site. In response, Cargill proposed installation of two injected permeable reactive barriers to address source area contamination and limit off-site migration of the plume. KDHE approved implementation of the IM Work Plan/Design on September 25, 2008. The IM was implemented in March/April 2009. Routine groundwater monitoring was conducted through November 2011 to evaluate the performance of the IM.

Cargill submitted a Corrective Action Study (CAS) Report to KDHE for the Site, which was approved on July 10, 2013. KDHE prepared a Draft Corrective Action Decision (CAD), which identified KDHE's preferred alternative to address contamination and made it available for public review and comment. The Final CAD was signed by the Secretary on May 14, 2015. Groundwater monitoring is being conducted bi-ennially. Should contaminant trends indicate the need for contingency measures, injections to enhance reductive dechlorination will be reconsidered.