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| Title | Spokane River PCBs Total Maximum Daily Load Study (DRAFT report) | |||
| Month-Year Published | June 2006 | |||
| Online Availability |
1279 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
This draft report is posted for review purposes only. (Also see abstract below) | |||
| Publication Number | 06-03-024 | |||
| Author(s) | Serdar, D., K. Kinney, and P. Hallinan | |||
| Print Availability | ||||
| Number of pages | 109 + app. (143 total) | |||
| Keywords | Columbia River, fish, implementation plan, lake, model, order, PCBs, point source, sampling, Spokane River, stormwater, Total Maximum Daily Load, tribe, water quality | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Spokane River PCB TMDL Stormwater Loading Analysis: Final Technical Report | similar topic | |||
| Abstract | Long Description |
The Washington State Department of Ecology conducted a Total Maximum Daily Load (TMDL) assessment for PCBs in the Spokane River, during 2003-2004 Sampling included analysis of PCBs in river water, industrial and municipal effluents, stormwater, suspended particulate matter, bottom sediments, sediment cores, and fish tissue. The study area covered the Spokane River from the Idaho border (RM 96.1) to the mouth at the Columbia River, and the Little Spokane River. Total PCB concentrations in water increase with successive reaches moving downstream from the Idaho border (106 pg/l) to lower Long Lake (399 pg/l), with a corresponding eight-fold increase in loads (477 - 3,664 mg/d), on average. Point source PCB loads from industrial and sewage treatment facilities are responsible for approximately 20% of instream loads. Stormwater from the City of Spokane may occasionally deliver large PCB loads to the river (1,100 mg/d, on average). Current PCB concentrations in some fish samples were found to be up to an order of magnitude lower than historical levels. A PCB loading scenario was proposed based on meeting the Spokane Tribe water criterion for PCBs (3.37 pg/l). The scenario requires a 95% PCB load reduction at the Idaho border, a 97% load reduction in the Little Spokane River, and =99% reductions in municipal, industrial, and stormwater discharges. A food-web bioaccumulation model indicated that PCB loads in water and PCB concentrations in sediment would require reductions of =99% in order to meet the Spokane Tribes tissue criterion. A Preliminary Implementation Strategy is presented which describes a general framework for reducing PCBs discharged to the Spokane River. It is intended to provide the starting point for developing the Water Quality Implementation Plan. This Plan will describe and prioritize specific actions planned to improve water quality and achieve water quality standards in the Spokane River. |
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Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
