San Francisco Estuary Institute Small Tributaries Loading Study #2 Zone 4 Line A, Cabot Blvd. Hayward Year 2 – Draft Data To-date Sources Pathways and Loadings Workgroup December 8 th 2008 Alicia Gilbreath and Lester McKee Item # 2b

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Season Data Inventory Item # 2b San Francisco Estuary Institute Samples Collected Field Duplicates Data Received Data QAQC Checked HgT32122No HgD20111No MeHgT2010No MeHgD2010No HgR91AllNo PCBs321AllNo PBDEs81AllNo OC Pesticides (DDT, chlordane, dieldrin) 81AllNo PAHs81AllNo Trace Elements (Ag, Al, As, Cd, Cr, Cu, Mn, Ni, Pb, Se, Zn) 2010No Fe1610No SSC100132No Organic carbon (DOC, POC)130 Yes

San Francisco Estuary Institute Item # 2b HgT range (n=22): 3 – 147 ng/L WY 2008 data DRAFT and subject to change. HgD range (n=11): 1.5 – 2.9 ng/L Hg(II)R (n=9): ND – 1.9 pg/L

San Francisco Estuary Institute Item # 2b t-PCB range (n=32): 336 – 102,234 pg/L WY 2008 data DRAFT and subject to change.

6 Item # 2b WY 2008 data DRAFT and subject to change.

7 San Francisco Estuary Institute Item # 2b WY 2008 data DRAFT and subject to change.

8 San Francisco Estuary Institute Item # 2b WY 2008 data DRAFT and subject to change.

9 San Francisco Estuary Institute Item # 2b Draft results for Hg and PCBs generally correlate with the first year of data Construction delay and few punctuated storms during potential sampling period led to opportunity to collect low- flow samples Low-flow data adds robustness to complete dataset