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Boston Harbor: An Environmental Success Story

Boston Harbor: An Environmental Success Story. Cleaning Up MWRA Discharges. MWRA Primary and Secondary Flows. Million Gallons Per Day. Decreased Bacteria Levels in Deer Island Effluent. Number of Days with High Bacteria Counts. MWRA Solids Discharges to Boston Harbor.

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Boston Harbor: An Environmental Success Story

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  1. Boston Harbor: An Environmental Success Story

  2. Cleaning Up MWRA Discharges

  3. MWRA Primary and Secondary Flows Million Gallons Per Day

  4. Decreased Bacteria Levels in Deer Island Effluent Number of Days with High Bacteria Counts

  5. MWRA Solids Discharges to Boston Harbor

  6. MWRA Treatment Plant Metals Discharges 1989-2000

  7. Questions (and grades) from 1990 “State of Boston Harbor” report • Are marine resources protected? • Is it safe to eat fish and shellfish? • Is it safe to swim? • How does the Harbor rate aesthetically? Overall 1990 Grade was D+

  8. Ampelisca abdita: • Tiny tube-dwelling crustacean • Moderately pollution intolerant • Builds tubes in the sediment

  9. Harbor sediment cross-section, sludge site, 1990

  10. Harbor sediment cross-section, sludge site, 1996

  11. Increased Species Diversity in Harbor Sediment Communities 45 40 35 Species per grab 30 25 20 15 10 91 92 93 94 95 96 97 98

  12. Is it safe to eat fish and shellfish?

  13. Mussels absorb and concentrate toxic contaminants from the water into their tissue

  14. Deployment of Mussels

  15. Decrease in PAH levelsin Mussels Deployed at Deer Island Predeployment LMW Concentration Predeployment HMW Concentration

  16. Is it safe to swim?

  17. 0-14 Open shellfishing 14-88 Restr. Shellfishing 88-200 Swimming 200-1000 Boating >1000 Poor No Data Map by Suh Yuen Liang

  18. 0-14 Open shellfishing 14-88 Restr. Shellfishing 88-200 Swimming 200-1000 Boating >1000 Poor No Data Map by Suh Yuen Liang

  19. Homaris americanus R. Michelson

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