Iron ore containing elevated concentrations of trace metals was
smelted here during 113 years of operation (1771-1883). We
sampled a variety of materials nearby to determine the amount of
metals such as arsenic, chromium, copper, lead, and zinc.
Overview of project assessing water quality of the Tualatin
River basin near Portland, Oregon with links to reports on
chemical and nutrient levels and selected data on streamflow,
water temperature, weather and precipitation. It is important
that we collect samples consistently and properly to assure the
quality of the information needed by decision makers. This
report explains the procedures for sampling water, sediment,
benthic invertebrates, and microorganisms. Outlines tactical
problems that make it difficult for beach managers to use
scientific information to make beach closure and advisory
decisions. Explains methodologies we are using to address those
problems and better prepare local decision makers. Outlines
processes that control the release of metals and a