Superfund Information Systems: Site Profile

Superfund Site:


Cleanup Activities

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The 3.7-acre Reilly Tar and Chemical Corp. (Dover Plant) site is located in Dover, Ohio. A coal tar refinery operated on site from 1932 to 1956. During that time, coal tar wastes accumulated on the ground from spillage and other site activities, leading to soil and groundwater contamination. Following cleanup, operation and maintenance activities and monitoring are ongoing.

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What Has Been Done to Clean Up the Site?

The site is being addressed through potentially responsible party (PRP) actions under federal and state oversight.

EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment in the short term. The remedy will not be protective in the long term until site cleanup goals are met.

Since the completion of the most recent five-year review, analysis of groundwater data has demonstrated that one of the remedial action objectives for the site, hydraulic control of the perched aquifer, is not being achieved by the remedy. EPA has requested that the site’s potentially responsible party (PRP) revise the remedial design work plan to address this issue. Currently, a revised long-term monitoring plan is being developed that will include installation and monitoring of additional groundwater wells to determine if the remedy is protective of human health and the environment in the long term. EPA also notes that tar removal rates have increased since 2012 and additional sampling and monitoring is now underway to determine the overall effect on the perched aquifer and groundwater plume.

The last five-year review for the site was completed on April 30, 2015 and concluded that the remedy is operating as intended and is protective in the short-term.

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What Is the Current Site Status?

The site’s long-term remedy included institutional controls, excavation and off-site thermal treatment of drainage ditch and river sediment, surface soil and other contaminated material, off-site disposal of solidified tarry materials, and excavation and on-site disposal of surface water drainage ditch and river sediment and surface soil. It also included a landfill cap and a soil cover over the remainder of the site, hydraulic control and collection of perched groundwater, natural attenuation and long-term monitoring of shallow groundwater, and continued sampling and analysis of river sediments to monitor long-term ecological effects. Remedy construction finished in 2000. Long-term groundwater monitoring is ongoing.

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Sampling and Monitoring


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Emergency Response and Removal

Cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. In 1989, an expedited response action removed 1,442 tons of coal tar and asphalt materials.

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