Small Tributaries Loading Study

1
Item 2b-2
Small Tributaries Loading Study 2 Zone 4 Line A,
Cabot Blvd. Hayward Year 2 Draft Data To-date
Sources Pathways and Loadings Workgroup May 14th
2008
Alicia Gilbreath and Lester McKee
2
Channel construction
Item 2b-2
WY 2007 WY 2008
3
Hg sampling status
Item 2b-2

• HgT
• 27 samples collected to date, 5 remaining
• 22 samples lab-analyzed to date
• HgD, MeHgT, MeHgD
• 12 samples collected to date, 4 remaining
• 11 HgD samples lab-analyzed to date

4
Hg data in so far
Item 2b-2

• HgT range (n22) 3 - 147 ng/L

5
HgT comparison between WYs
Item 2b-2
6
PCB sampling status and data
Item 2b-2

• 27 samples collected to date, 5 remaining
• t-PCB range (n11) 3091 104,513 pg/L

7
PCB comparison between WYs
Item 2b-2