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Mercury Transport to San Francisco Bay through the Sacramento-San Joaquin River Delta.

Mercury Transport to San Francisco Bay through the Sacramento-San Joaquin River Delta. Nicole David, Lester J. McKee, Jon E. Leatherbarrow. December 15, 2005. Item #7. Sampling Event 2005 January 3 through 6, 2005. Sampling Event 2005. Max dayflow 58,000 cfs.

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Mercury Transport to San Francisco Bay through the Sacramento-San Joaquin River Delta.

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  1. Mercury Transport to San Francisco Bay through the Sacramento-San Joaquin River Delta. Nicole David, Lester J. McKee, Jon E. Leatherbarrow December 15, 2005 Item #7

  2. Sampling Event 2005January 3 through 6, 2005

  3. Sampling Event 2005 Max dayflow 58,000 cfs (Max dayflow so far 150,000 cfs)

  4. Sampling Event 2005 Max HgT 13.89 ng/L

  5. Relationship between total Hg and SSC

  6. Relationship between total Hg and SSC influenced by salinity

  7. Water Year Flow (Mm3) Sediment (Mt) Mercury (kg) 1995 51,559 2.58±0.83 399±136 1996 31,436 1.01±0.32 184±62 1997 42,307 2.24±0.72 351±119 1998 53,639 2.42±0.77 389±132 1999 27,805 0.84±0.27 156±53 2000 22,394 0.66±0.21 123±42 2001 8,565 0.26±0.08 52±18 2002 11,303 0.31±0.10 58±20 2003 17,330 0.55±0.17 97±33 2004 18,577 0.64±0.20 110±37 2005* 14,266 0.33±0.11 64±22 Average 27,198 1.08±0.34 180±61 Annual Mercury Loads

  8. Organic Contaminants *four samples collected in May 2003 had TPCB concentrations ranging from 890 – 6700 pg/L Item #7

  9. Preliminary Loading EstimatesLoads are preliminary and were estimated using Regression (REG) and Flow Weighted Mean Concentrations (FWMC). Preliminary estimates of errors are approximately ± 25%. PCBs PAHs FWMC FWMC 6 230 23 350 Item #7

  10. Project Sampling Schedule • WY 2006: Collect “first flush” data and sample storm event over 150,000 cfs • WY 2007: Sample storm event over 150,000 cfs only* • WY 2008: Sample storm event over 150,000 cfs only* • WY 2009: Sample all floods * With RMP contingency money

  11. Project Reporting Schedule • 2006 Final Report: 2002–2005 data • 2009 Report sampling results and reinterpret existing data Item #7

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