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1 PCB and PBDE loads at Mallard Island on the Sacramento River: WYs 2002 - 2006 John Oram, Jon Leatherbarrow, and Lester McKee Sources Pathways and Loadings.

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Presentation on theme: "1 PCB and PBDE loads at Mallard Island on the Sacramento River: WYs 2002 - 2006 John Oram, Jon Leatherbarrow, and Lester McKee Sources Pathways and Loadings."— Presentation transcript:

1 1 PCB and PBDE loads at Mallard Island on the Sacramento River: WYs John Oram, Jon Leatherbarrow, and Lester McKee Sources Pathways and Loadings Workgroup November 13 th 2006 Item #1

2 2 PCBs and PBDEs at Mallard Island MODIS 250km True Color Image | January 9, 2006 Item #1

3 Modified Methods for PBDEs and PCBs 1.Use SSC data from USGS from 1995 to present Not applicable for PCBs and PBDEs 2.Use instantaneous SSC and contaminant data to develop a regression relationship (WY ) 3.Estimate 15 minute contaminant concentrations 4.Calculate daily average concentrations 5.Use linear interpolation to fill data gaps Regression not valid, use FWMC 6.Combine estimated daily concentrations with Delta Outflow to estimate daily advective loads 7.Correct loads for the effect of tidal influence and dispersion Item #1

4 4 PCBs Item #1

5 5 PBDEs Item #1

6 6 PCBs vs SSC WY No Significant Relationship Will Use FWMC Instead. Item #1

7 7 PBDEs vs SSC WY No Significant Relationship Will Use FWMC Instead. Item #1

8 8

9 9 Flow Weighted Mean Concentrations Item #1

10 10 Loads Item #1

11 11 Estimating Historic Loads by Linear Regression with Discharge Item #1

12 12 Historic Load Estimates Item #1

13 13 How did WY05 & WY06 compare to previous years? Annual Discharge (Mm3) Min = 3055 (WY77) Max = (WY83) Mean = WY06 = WY05 = Item #1


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