Roadway Runoff Water Quality from Milled and Unaltered Surfaces during Convective Storms
Publication: Journal of Environmental Engineering
Volume 137, Issue 12
Abstract
Time series of total suspended solids, and total and dissolved copper, zinc, and lead concentrations were compared between milled hot-mix asphalt (HMA) roadway sections () and unaltered HMA roadway sections (). Milled and unaltered road surface runoff water quality parameter values were within the ranges reported previously for unaltered rural and urban roadways. Event mean concentrations of suspended solids and lead were greater for milled roadway surfaces than for unaltered surfaces. No differences in copper and zinc concentrations were observed between road treatments. Contaminant mobilization was flow-driven, with incomplete wash-off of roadway constituents during the short-duration convective storm events. Storm precipitation intensity was not an indicator of storm-water quality. The presence of lead in runoff from milled roadway sections in this study indicated a road side soil source of the solids resulting from overland flow from adjacent land surfaces onto the roadway. Future milling operations should proceed with consideration not to create new hydraulic connections with the adjacent roadside.
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Acknowledgments
This research was sponsored by the Joint Highway Research Advisory Council (JHRAC) of the University of Connecticut and the Connecticut Department of Transportation, and was performed through the Connecticut Transportation Institute of the University of Connecticut. We thank Messrs. John DaDalt, Gilbert Hansen, and Justin Webster for helping with sample collection. Dr. Jack Clausen and the UConn Center for Environmental Sciences and Engineering are thanked for loaning the ISCO sampling equipment used in this study. Dr. Clausen and Mr. Gary Ulatowski are thanked for help in the set-up and trouble-shooting of ISCO control systems. Mses. Roopa Krishnamurthy and Raquel Figueroa are thanked for assistance in sample preparation for water quality parameter analyses. We appreciate the careful comments provided by anonymous reviewers for an earlier manuscript version.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1165 - 1175
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 9, 2010
Accepted: Jun 9, 2011
Published online: Jun 11, 2011
Published in print: Dec 1, 2011
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