August 2011 - Sediment biodiversity (PDF)

June 2011 - Red Tide-Correction to previous notification and additional data (PDF)

May 2011 - Red Tide-original notice (PDF): Results from a May 20, 2011 survey show that at least one sample from eight of ten monitoring stations had Alexandrium counts exceeding the Contingency Plan threshold. Get more information about Red Tide from the Woods Hole Oceanographic Institution.

August 2010 - Sediment biodiversity (PDF): On January 3, 2011, MWRA completed its data quality reviews and calculations of Contingency Plan threshold values for diversity in the bottom-dwelling community and for the abundance of pollution tolerant animals for its August 2010 monitoring. That is, the community was more diverse than in baseline, before the outfall came on-line.

Other measures of the sediment animal community health including sediment oxygenation, sediment quality, the abundance of animals, and the other two diversity indices, showed no indication that excessive sediment enrichment was occurring, or that there has been a decline in sediment community health. The number of opportunistic animals remains extremely low. Therefore, all indications so far are that the increased diversity is a normal fluctuation of the sediment animal population.