| Study ID | RCOO0008 |
| Study Name | West Medical Lake PCBs, Dioxins and Furans in Fish, Sediment, and Wastewater Treatment Plant Effluent |
| EIM Data Entry Review Status | Reviewed |
| Study Type | Total Maximum Daily Load (TMDL) development |
| Study Purpose | To establish load allocation for PCBs and Dioxins from the Medical Lake Treatment Plant. Six fish tissue, seven sediment, and four Medical Lake wastewater treatment plant (WWTP) effluent samples were collected. The toxics analyzed included polychlorinated biphenyls (PCBs), 2,3,7,8-tetrachlorodibenzodioxin (TCDD or dioxin), and other chlorinated dioxins and furans. Additional conventional parameters included lipids in fish tissue, total organic carbon (TOC) and grain size for sediments, and total suspended solids and TOC for WWTP effluent. |
| Field Collection Date Range | 2/12/2008 - 10/28/2008 |
| Data First/Last Loaded Date |  |
| Data Last Updated Date | |
| Ecology Program or Other Responsible Entity | Ecy Environmental Assessment Program |
| Ecology Contact | Randy Coots |
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| Study QA Planning Level | LEVEL 4: Approved QAPP or SAP. |
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| Study QA Assessment Level | Level 5: Data Verified and Assessed for Usability in a Peer-Reviewed Study Report |
| Study Result Description | Total PCB concentrations in fish tissue were generally low compared to statewide levels. However the EPA National Toxic Rule human health criterion was still exceeded by a factor of two to eight. Tissue concentrations of dioxin/furans were low and TCDD was not detected.
In sediment, total PCBs and dioxin/furans were below apparent effects thresholds (AET) for protection of benthic infauna based on Washington State’s proposed freshwater Sediment Quality Guidelines.
Total PCBs in WWTP effluent were low and below the NTR criterion for human health throughout the year. In the April sample, TCDD was reported just above the reporting limit, exceeding the NTR criterion. The April results may be related to the WWTP upset in the de-nitrification system. No furans were reported above detection. |
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