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EXPLANATION OF SIGNIFICANT DIFFERENCE: CINTAS-MEAD STREET SITE, WICHITA, SEDGWICK COUNTY, KANSAS
Kansas Department of Health and Environment, 20 pp, 2017

This ESD documents a significant change to the Corrective Action Decision (CAD) issued on June 26, 2013. The site soil and groundwater are affected primarily by PCE, TCE, and daughter products. The CAD remedy called for monitored natural attenuation (MNA) and land use controls to achieve the remedial action objectives for impacted groundwater. The alternative remedy in this ESD calls for enhanced reductive dechlorination (ERD) followed by MNA, groundwater monitoring, and land use controls. ERD is in situ bioremediation implemented to promote anaerobic biological dechlorination of chlorinated solvents in the subsurface by direct and cometabolic degradation processes. The ESD changes the remedial design by the construction of a temporary drum and injection equipment staging area to support direct-push injections of an emulsified vegetable oil-based substrate (SRS™) and sodium bicarbonate. After amendments injection, the remedy will revert to the MNA remedy specified in the 2013 CAD. The modification is described in greater detail in the 2017 Groundwater Remediation Work Plan, available with the ESD at http://www.kdheks.gov/remedial/site_remediation/cintas.html.



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