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Mallard Island Large Rivers Loading: Monitoring WY 2010

Item #4. Mallard Island Large Rivers Loading: Monitoring WY 2010. Nicole David Sources, Pathway, and Loading Work Group May 27, 2009. Item #4. Background. SPLWG recognized Delta outflow as potentially significant pathway for contaminants Identified as a high priority information gap

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Mallard Island Large Rivers Loading: Monitoring WY 2010

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  1. Item #4 Mallard Island Large Rivers Loading: Monitoring WY 2010 Nicole David Sources, Pathway, and Loading Work Group May 27, 2009

  2. Item #4 Background • SPLWG recognized Delta outflow as potentially significant pathway for contaminants • Identified as a high priority information gap • Study initiated in 2002

  3. Samples Collected Item #4 *Contingency money used (15 samples)

  4. Delta Outflow from 12/20/05 to 01/25/06 Item #4 370,000 cfs

  5. Item #4 Load Estimates

  6. Item #4 Slope 0.29 - Tidal SSC – Hg Relationships Influence Loads Slope 0.11 - Low Flow High Flow - Slope 0.22

  7. Item #4 PCB Loads and Allocations

  8. Item #4 Hg Loads and Allocations

  9. Item #4 Sampling Budget Example 5–6 Storms 40 samples for Hg, PCBs, and sediment $35,000 20 samples for Hg speciation (HgD, MeHgT, MeHgD, Hg(II)) $10,000 Lab Total $45,000 Field Labor $25,000 Project Management + Reporting $30,000 Overall $100,000

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