1 / 18

Der Ausblick von der Flussmündung Hinauf zu den Bergen

Der Ausblick von der Flussmündung Hinauf zu den Bergen. Herr Doctor Khalil E. Abu-Saba. The View from Downstream Khalil Abu-Saba San Francisco Bay Regional Water Quality Control Board. Manage in the watersheds. Measure in the water. Overview. Connecting downstream data

polly
Download Presentation

Der Ausblick von der Flussmündung Hinauf zu den Bergen

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Der Ausblick von der Flussmündung Hinauf zu den Bergen Herr Doctor Khalil E. Abu-Saba

  2. The View from DownstreamKhalil Abu-Saba San Francisco Bay Regional Water Quality Control Board Manage in the watersheds. Measure in the water.

  3. Overview Connecting downstream data to upstream watersheds: • What chromium and silica taught us • The mercury story in California

  4. This discussion is about: Published historic accounts Public information (hearings, staff reports, peer-reviewed science) Staff recommended actions This discussion is not about: The will or intent of the Regional Board, the State Board, or the State of California The anticipated outcome of any public process The usual caveats...

  5. Hydrology + Geography = Geochemistry

  6. Summer: Low Flow Winter: High Flow Chromium Silica Flow Details in Abu-Saba and Flegal (1997)

  7. First Point: The View from Downstream • Chromium and Silica are geochemical tracers • We can see the effect of shifting freshwater sources downstream • Winter 1993 pulses of waters entered estuary • Chromium / Aluminum ratios also showed a shifting sediment source in Winter 1993

  8. Sources Current Background Mercury in Sediment Historic Baseline Sand Clay Second Point: The View from Downstream • The story of mercury in California is recorded in the sediments

  9. 1.2 0.8 Mercury (ppm) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand RMP Base Program Data

  10. 1.2 0.8 Mercury (ppm) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand Design Integration Workgroup Current Background

  11. 1.2 0.8 Mercury (ppm) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand State TMDL funds to evaluate Pre-human condition of Lower South Bay Current = 0.40 Baseline = 0.06

  12. 1.2 0.8 Mercury (ppm) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand Guadalupe River Mercury TMDL Spearheaded by SCVWD New Almaden

  13. 1.2 0.8 Mercury (ppm) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand RMP Air Deposition Study and relevance to contemporary background Global Regional Air Dep. ? 0.34 ppm ? Mining

  14. Investigation of remote watershed sources: CALFED CVRWQCB UCSC 1.2 Mercury in 0.8 Bottom Winter 1993 Sediments (µg/g) 0.4 0.0 0 50 100 % Fines (<63 µm) Clay Sand

  15. Link to Beneficial Uses: Methylmercury studies by CALFED, BASMAA, SCVWD, UCSC Methylation Bioaccumulation Total Mercury Bacteria in wetlands, mudflats and sloughs Methylmercury • Mercury is methylated in the margins of the Bay • Methylation rates highest at the fresh-salt interfaces • High total mercury concentrations ALWAYS associated with high methylmercury concentrations • High methylmercury concentrations OFTEN, but NOT ALWAYS associated with high total mercury concentrations

  16. Basin Plan Narrative Objective for Bioaccumulation • “Controllable water quality factors shall not cause a detrimental increase in the concentrations of toxic substances found in bottom sediments or aquatic life. Effects on aquatic organisms, wildlife, and human health will be considered.”

  17. Third Point: The View from Downstream • RMP Base Program sets the stage • Pilot, special, and external studies address key uncertainties • Today’s talk: • SFEI, State, CALFED, BASMAA, SCVWD, CVRWQCB, UCSC…. • Many many others • POTW ultra-clean monitoring, near-field methylmercury measurements, SFEI consumption study, RMP fish surveys... • Keep those cards and letters coming!

  18. + + But What Does it All Mean?

More Related