The report, “Spokane River PCBs and Other Toxics at the Spokane Tribal Boundary: Recommendations for Developing a Long-Term Monitoring Plan”, is available at
The Department of Ecology conducted seasonal monitoring for toxic contaminants in the Spokane River at the eastern Spokane Tribal boundary during 2015 – 2016. This monitoring area is downstream of all known sources of PBDEs, PCBs, and metals (cadmium, copper, lead, and zinc). Toxics monitoring was conducted to provide recommendations for establishing a long-term monitoring program for the site.
Surface water and suspended sediment samples were taken during the three major hydraulic river regimes: spring high flow, summer low flow, and winter moderate flow. The samples were analyzed for PCBs, PBDEs, dioxins/furans, and metals (cadmium, copper, lead, and zinc). Three collection and extraction techniques were used to ensure detection of PCBs and PBDEs in surface water: CLAM (Continuous Low-level Aqueous Monitoring device), XAD-2, and liquid-liquid extraction with two-liter composite samples. Suspended sediments were collected with sediment traps deployed for four months at a time.
Recommendations were made to continue long-term monitoring in the Spokane River at the eastern Spokane Tribal boundary site, with minor changes in collection techniques and toxic parameters to consider for analysis.
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