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Assessment of Mercury Loads and Organic Contaminants in the Guadalupe River Watershed

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This study presents a comprehensive analysis of mercury loads, suspended sediment concentrations, and organic contaminants in the Guadalupe River Watershed. It examines data from various sampling locations and years, highlighting total mercury and methylmercury concentrations, bedload mercury loads, and the relationship between organic contaminants and sediment. The research aims to explore transport processes and management effects on mercury loads, providing critical insights for environmental management and policy decisions. Future modeling and additional funding considerations are discussed for extended research.

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Assessment of Mercury Loads and Organic Contaminants in the Guadalupe River Watershed

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  1. The “Guadalupe River Study” Lester McKee, John Oram, Jon Leatherbarrow SFEI Autumn Bonnoma, Mark Stephenson, Wes Heim MLML Item #8 Small Tributary Loads

  2. Item #8 Sampling Location

  3. Item #8 Sampling

  4. Item #8 Suspended Sediment Loads

  5. Item #8 HgT v SSC (all data)

  6. Item #8 Sources of Mercury HgT mg/kg (ppm)

  7. Item #8 Total Mercury Loads 133% MAQ 111% MAQ 96% MAQ

  8. Item #8 Methylmercury Concentrations

  9. Item #8 Methyl Mercury Loads • 40 g or 0.5% of total Hg load

  10. Item #8 Bedload Mercury Concentrations

  11. Item #8 Bedload Mercury Loads • 1% of total Hg load

  12. Item #8 WY05 Organic Contaminants Concentrations tPBDEs = 2 to 3 x tPCBs

  13. Item #8 Organic Contaminants Loads

  14. Item #8 Discharge SSC 10,805 tons 53.1 Mm3 WY 2003 45.3 Mm3 8,578 tons WY 2004 58.0 Mm3 4,575 tons WY 2005

  15. Item #8 tPCBs vs. SSC WY 2005 samples showed increased separation between rising and falling stages

  16. Item #8 Rising and Falling Stages tPCBs tPBDEs

  17. Item #8 Project Schedule • WY 2005 • Report completed read for review • WY 2006 funded by USACE/SCVWD / RMP • Complete QAQC for all WYs and get the data on the WWW • Write papers for Journal • WY 2007 funded? • Only WY 2006 currently guaranteed but everything in place for continuation • RMP funding not yet discussed • Future Modeling (if funding is found)? • Explore transport processes in more detail • Explore and predict the effects of management on Hg loads

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