Effects of Deicing Salts on the Chloride Levels in Water and Soil Adjacent to Roadways
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2007-07-01
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TRIS Online Accession Number:1115812
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Edition:Final Report
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Abstract:In 1971, the Michigan Department of Transportation began a study of the effects of roadway deicing salts on the chloride levels in roadside soils and groundwater. Monitoring included sampling of surface water from ponds, streams, and drains, as well as from shallow groundwater wells that received recharge from surface water drainage from the roadways containing chlorides from winter maintenance deicing applications. Monitor well arrays were situated on roadway segments along a north-south trunkline system extending from the northern Lower Peninsula to the south-central region of the State. Chloride levels were monitored during the period from 1976 through 2006 at which time the investigation was ended. Results of the monitoring showed that the chlorides applied to the roadways are diluted by precipitation which prevents chloride build-up in the roadside soils and groundwater. The levels of chloride in the roadside surface waters also were found to be within acceptable limits. Caution is recommended regarding the use of alternative organic deicers that may result in biodegradation of the roadway infrastructure by bacteria and other organisms known to be in the roadway environment.
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