Methylmercury in Dredged Operations and Dredged Sediment Reuse in the San Francisco Estuary

First Floor Auditorium
State of California Building
1515 Clay Street
Oakland, CA 94612

Meeting Purpose: Discuss information needs and options for managing adverse impacts of methylmercury from dredging and dredged material placement, particularly in restoration efforts.

Target Audience: Participants will include representatives from the dredging community, managers, scientists, the USACE, and other interested parties.

Meeting Goals: The meeting goals are to:

• Summarize the state of knowlege of methylmercury processes for dredging and dredged material placement
• Explore which components of the ecosystem need to be monitored in order to evaluate methylmercury impact
• Discuss how we define a positive outcome with respect to dredged material reuse

Contact Don Yee at (510) 746-7369, Jennifer Hunt at (510) 746-7347, or Bill Brostoff at
(415) 503-6867 for more information.

Presentations

• Bill Brostoff (USACE)
  Welcome/goals for this meeting (Presentation PDF)
• Ellen Johnck (Bay Planning Coalition
  Welcome/goals for this meeting (VIDEO)
• Steve Goldbeck (San Francisco Bay Conservation and Development Commission) Introduction to the LTMS and LTMS questions regarding mercury methylation and dredging
  activities/dredge material placement (Presentation PDF) (VIDEO)
• Dyan White Agency discussion of MeHg management needs Context of overall MeHg management
  strategy for San Francisco Bay. Goals of mercury TMDL. (Presentation PDF) (VIDEO)
• Brian Ross (USEPA) Context for evaluating dredging/dredge material disposal/dredge material reuse. Dredging
  operations and dredged sediment disposal quantities, present and projections Relative
  amts in bay ocean upland and wetland disposal, how big is this issue (Presentation PDF)
• Don Yee (SFEI) A Simple MeHg mass budget for SF Bay Context and extrapolation of dredged material/wetland contribution Don Yee, SFEI- gives a sense of how big an impact dredging and
  restoration operations could/would have on the whole system (Presentation PDF) (VIDEO)
• Mark Marvin-DiPasquale (USGS) How sediment mobilization affects inorganic mercury speciation and methylation potential: Case studies from Alviso Slough and the S. Yuba River (VIDEO)
• Elly Best (ERDC) Summary of Hamilton Wetland Restoration Studies Very detailed info- how can/do we design restoration and monitoring plans based on info collected, and extrapolate to other
  sites. Lessons learned. (Presentation PDF) (VIDEO)
• Mark Stephenson (CDFG) MeHg transport to/from Suisun Bay wetlands Estimates, uncertainties and challenges of export measurement (Presentation PDF) (VIDEO)
• Bryan Bemis (Applied Marine Sciences) Mercury methylation in dredged material settlement ponds from Sacramento and San Joaquin River dredge material. (Presentation PDF) (VIDEO)
• Holger Hintelman (Trent University) Measuring methylmercury exposure
  Monitoring options- Diffusion Gradient Thinfilm (DGT) Is this a good surrogate for biota? Or
  water or sediment? (Presentation PDF) (VIDEO)
• Letitia Grenier (SFEI) Monitoring options- biosentinels Make your beneficial use target your monitoring tool. Management planning options. South Bay Salt Ponds Plans- Case study/ Example strategy
  -how to move ahead without certainty - benefits, pitfalls, best/worst case scenarios. (Presentation PDF) (VIDEO)
• Manager Round Table (VIDEO)
• Scientist Round Table (VIDEO)