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Investigations of Impacts of Selected Highway Maintenance Practices on Water Quality: Volume II
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1985-03-01
[PDF-1.20 MB]
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Abstract:This report, Volume II in a four-volume series of reports, describes a field research program to determine water quality impacts from two routine highway maintenance practices -- control of vegetation using herbicides and surface treatment (seal-coating) of asphaltic concrete pavements. It includes the details of monitoring site selection, precipitation and storm water runoff monitoring, performance of the above maintenance practices, and analysis of results. Two sites were monitored in the herbicide study; one was treated with 2,4-D, the other with picloram. For the surface treatment operation, an asphalt road was treated with a WS-90 asphalt emulsion followed by application of limestone gravel. Chemical analyses and bioassays conducted on runoff samples generally indicate these practices do not impact water quality.
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