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Herbicide use in the management of roadside vegetation, Western Oregon, 1999-2000 : effects on the water quality of nearby streams.
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    The USGS entered into a cooperative agreement with ODOT to assist the ODOT Technical Advisory Committee in evaluating the potential for impacts on water quality in nearby streams after IVM application of herbicides. This report presents the results of the work done by the USGS as part of that agreement. The first part of the study was a literature review, excerpts from which are presented in the Background section of this report. Much of the information reviewed was obtained from the agricultural literature, as most studies examining the runoff of herbicides have been done in that context. Relatively little work has been done studying the transport of herbicides from road shoulders, although the results from one study done in Glenn County, California (Powell et al., 1996), are relevant.

    As a result of the literature review, it was concluded that not enough was known about the fate and transport of herbicides used to control roadside vegetation to make a reasonable assessment of ODOT’s potential contribution to the loads of herbicides carried by small Oregon streams. In particular, many of the site- and compound-specific variables that determine the fate and transport of herbicides could be very different in the setting of a highway right-of-way than in an agricultural setting. To address remaining uncertainties, a field study was initiated that included the collection of water samples targeted at an improved understanding of the transport of herbicides from the road shoulder.

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