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Illinois State Geological Survey


ROADWAY RUNOFF ASSESSMENT PROGRAM

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ROADWAY RUNOFF ASSESSMENT PROGRAM




The Illinois Tollway must balance the need to move people safely while
protecting water quality. Many natural areas that provide aquatic habitat border
the Tollway system, and municipalities rely on clean surface and groundwater for
recreational opportunities and municipal water supply.




Pollutants from Tollway construction activities and roadway runoff can
potentially reach downstream waters and shallow aquifers. Common pollutants of
interest are suspended sediment from land-surface disturbance, heavy metals from
automotive sources, and chloride from road salt applications. The Illinois
Tollway has implemented best management practices (BMPs) to reduce discharge and
pollution reaching the Chicago Area Waterways System (CAWS). The Illinois State
Geological Survey (ISGS) monitors hydrology and water quality to determine the
effectiveness of roadside treatment wetlands, such as bioswales, for removing
these contaminants. Further, impaired waterways that receive runoff from the
Tollway and are monitored for concentrations of roadway-derived target
contaminants regulated by IEPA.




Roadway Runoff Assessment Program

615 East Peabody Dr.

M/C 650

Champaign, IL 61820

217-333-4747



Email: info@isgs.illinois.edu



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