USGS Washington Water Science Center
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Figure 1. Locations of streams with measurements of dissolved copper concentrations in the top 5% of values for urban and non-urban streams in the Washington State Department of Ecology database (J. Sloan, Washington State Department of Ecology, personal communication February 2010)
Figure 2. Location of Mill Creek and Thornton Creek watersheds for which pilot studies of copper attenuation were conducted for the project.