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Sediment Toxicity Monitoring S&T program 1993-2005 Toxicity is persistent in the Estuary and more frequent in the northern and southern regions. Between.

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Presentation on theme: "Sediment Toxicity Monitoring S&T program 1993-2005 Toxicity is persistent in the Estuary and more frequent in the northern and southern regions. Between."— Presentation transcript:

1 Sediment Toxicity Monitoring S&T program 1993-2005 Toxicity is persistent in the Estuary and more frequent in the northern and southern regions. Between 1997-2001 67% of S&T sediment samples were toxic to either species: Eohaustorius (amphipod) Mytilus (bivalve larvae)

2 Winter Summer Change in the S&T Experimental Design in 2000 Less toxicity seen in the summer

3 New Proposal The TRC asked us to develop a new proposal that focused on getting at what might be causing the persistent sediment toxicity observed in the Status and Trends Program Get review and comments from the Toxicity Workgroup

4 The Toxicity Workgroup met (Nov. 27 th ) Endorsed the overall proposal: Liked the standard 10-day estuarine amphipod test Focus on Bay-margins in the winter New sediment TIE methodology is well developed Study is consistent with what the workgroup had proposed in past Want to participate in developing the site selection criteria and the prioritized list of sites to investigate

5 Sediment TIE Study Proposal TIEs will be conducted with the estuarine amphipod Eohaustorius estuarius. The goal of this study is to use newly- developed sediment TIE methods to determine the possible causes of sediment toxicity at the margins of the Estuary.

6 Sediment TIE Study Proposal 1.Develop a list of sampling sites 2.Screen sites to locate two toxic sites 3.Conduct the TIE study at these sites

7 Sediment TIE Study Proposal - Three phase sediment TIE I.Characterization II.Identification III.Confirmation - Bulk sediment and pore-water samples - Standard EPA toxicity methods for estuarine sediments (E. estuarius 10-day survival)

8 Sediment TIE Study Proposal 1.Develop a list of sampling sites

9 Sediment TIE Study Proposal 2. Screen sites to locate two toxic locations Sample first four sites if toxic conduct TIEs, Chemistry & assess duration If not toxic sample four more sites if toxic conduct TIEs, and Chemistry

10 Sediment TIE Study Proposal 2. Screen sites to locate two toxic locations Sample first four sites if toxic conduct TIEs, Chemistry & assess duration If not toxic sample four more sites if toxic conduct TIEs, and Chemistry If none of the eight sites are toxic enough to warrant a full TIE, sample last four sites (after) if toxic conduct TIEs, and Chemistry

11 Summary - Develop a prioritized list of sites (12) - Sample first four -4 if toxic conduct TIEs, Chemistry and assess duration - If not toxic sample four more sites -4 if toxic conduct TIEs, and Chemistry If none of eight sites are toxic consult TRC for approval of four more sites in 2008 - Sample last four sites -4 if toxic conduct TIEs, and Chemistry 0

12 Budget 2007 Episodic Toxicity Budget: $140,000 Sediment TIE Study Proposal 2007: $96,600


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