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| Title | Reassessment of Toxicity of Lake Roosevelt Sediments | |||
| Month-Year Published | December 2001 | |||
| Online Availability |
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| Short Description |
Sediments from nine sites within Lake Roosevelt and the upstream reach of the Columbia River were tested for metals concentrations and toxicity by the Washington State Department of Ecology during May 2001. The resulting data were needed to determine if these sites should remain on the federal Clean Water Act Section 303(d) list of impaired waterbodies. Sediment samples were analyzed for arsenic, cadmium, copper, lead, mercury, and zinc. (Also see abstract below) | |||
| Publication Number | 01-03-043 | |||
| Author(s) | Era, B. and D. Serdar | |||
| Print Availability | ||||
| Number of pages | 26 pp. + app (54 total) | |||
| Keywords | 303(d), assessment, bioassay, Columbia River, creek, lake, Lake Roosevelt, lead, order, river, section 303, sediment, SEPA, study, toxic, toxicity, water, zinc | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Quality Assurance Project Plan: Reassessment of Toxicity of Lake Roosevelt Sediments | similar topic | |||
| Abstract | Long Description |
Sediments from nine sites within Lake Roosevelt and the upstream reach of the Columbia River were tested for metals concentrations and toxicity by the Washington State Department of Ecology during May 2001. The resulting data were needed to determine if these sites should remain on the federal Clean Water Act Section 303(d) list of impaired waterbodies. Sediment samples were analyzed for arsenic, cadmium, copper, lead, mercury, and zinc. Bioassay tests for toxicity included Chironomus tentans 20-day survival and growth, Hyalella azteca 10-day survival, and Microtox 100% porewater. With the exception of the Grand Coulee site, all nine sites showed toxicity to at least one of the bioassays. Sediment from the Goodeve Creek site, seven river miles downstream of the Canadian border, was the most toxic to all the bioassay organisms. Based on the existing 303(d) policy, listing requires only one toxicity hit per segment. Eight of nine sites meet current listing criteria. However, none of the sites meet criteria based on the newly proposed listing policy, which requires toxicity at three separate locations within a segment. Consequently, it is recommended that the eight sites showing toxicity should be reassigned to part 5, Undetermined Status, of the proposed 2002 303(d) list. Undetermined Status designation for these sites will allow the Department of Ecology and/or other public and private stakeholders to pursue measures to address toxicity in Lake Roosevelt and the upper Columbia River. |
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This page last updated August 17, 2011
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