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| Title | Contaminant Trends in Lake Roosevelt | |||
| Month-Year Published | November 1994 | |||
| Online Availability |
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| Short Description |
During 1992 and 1993 the Washington State Department of Ecology monitored dioxin, furan, and trace metal concentrations in suspended particles and selected fish tissues collected from upper Lake Roosevelt. The primary objective of the monitoring was to provide information about temporal trends in concentrations of these pollutants. This report presents new 1993 data and discusses this information in the context of previously reported 1990 and 1992 data. (Also see abstract below) | |||
| Publication Number | 94-185 | |||
| Author(s) | Serdar, D., W. Yake, and J. Cubbage | |||
| Print Availability | ||||
| Number of pages | 32 pp. + app (58 total) | |||
| Keywords | cadmium, contaminant, copper, dioxin, fish, lake, lead, mercury, metals, methods, pulp, sediment, toxic, toxicity, trend, waste, zinc | |||
| Subject Waterbodies |
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| Abstract | Long Description |
During 1992 and 1993 the Washington State Department of Ecology monitored dioxin, furan, and trace metal concentrations in suspended particles and selected fish tissues collected from upper Lake Roosevelt. The primary objective of the monitoring was to provide information about temporal trends in concentrations of these pollutants. This report presents new 1993 data and discusses this information in the context of previously reported 1990 and 1992 data. The primary historical source of dioxins and furans (especially 2,3,7,8-TCDD and 2,3,7,8-TCDF) in Lake Roosevelt has been the Celgar pulp mill in Castlegar, British Columbia. The Cominco lead-zinc smelter in Trail, B.C. is largely responsible for elevated metals concentrations (especially zinc, lead, copper, arsenic, cadmium, and mercury). Dioxin and furan concentrations in suspended particles, as well as lake whitefish muscle and eggs, found in 1993 generally confirm the decreases in contamination recorded between 1990 and 1992. While concentrations of some of the less toxic forms of dioxin and furan in suspended particles increased between 1992 and 1993, the overall toxicity of these compounds in particles and whitefish tissue remained much lower than it had been in 1990. The reduction in dioxin/furan levels reflects changes in pulp production and wastewater treatment methods at Celgar. Significant additional reductions in metals discharged from the Cominco facility will be necessary before concentrations in Lake Roosevelt fish and sediments begin to return to levels typical of unperturbed systems. |
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