Mercury Transport to San Francisco Bay through the Sacramento-San Joaquin River Delta. Nicole David, Lester J. McKee, Jon E. Leatherbarrow December 15, 2005 Item #7
Mar 27, 2015
Mercury Transport to San Francisco Bay
through the Sacramento-San
Joaquin River Delta.
Nicole David, Lester J. McKee, Jon E. Leatherbarrow
December 15, 2005
Item #7
Sampling Event 2005 January 3 through 6, 2005
Sampling Event 2005
Max dayflow 58,000 cfs
(Max dayflow so far 150,000 cfs)
Sampling Event 2005
Max HgT 13.89 ng/L
Relationship between total Hg and SSC
y = 0.11x + 2.76
R2 = 0.8
0
2
4
6
8
10
12
14
16
0 20 40 60 80 100 120
SSC (mg/L)
Mer
cury
(n
g/L
)
Relationship between total Hg and SSC influenced by salinity
y = 0.12x + 2.54
R2 = 0.8
y = 0.29x - 2.13
R2 = 0.8
0
2
4
6
8
10
12
14
16
0 20 40 60 80 100 120
SSC (mg/L)
Me
rcu
ry (
ng
/L)
EC < 2 mS/cm
EC > 2 mS/cm
Annual Mercury LoadsWater Year Flow (Mm3) Sediment (Mt) Mercury (kg)
1995 51,559 2.58±0.83 399±136
1996 31,436 1.01±0.32 184±62
1997 42,307 2.24±0.72 351±119
1998 53,639 2.42±0.77 389±132
1999 27,805 0.84±0.27 156±53
2000 22,394 0.66±0.21 123±42
2001 8,565 0.26±0.08 52±18
2002 11,303 0.31±0.10 58±20
2003 17,330 0.55±0.17 97±33
2004 18,577 0.64±0.20 110±37
2005* 14,266 0.33±0.11 64±22
Average 27,198 1.08±0.34 180±61
Organic Contaminants
WY 2002 WY 2003 WY 2004TPCBs (pg/L) 200 - 660 320 - 850* 210 - 990TPAHs (ng/L) 16 - 33 12 - 36 5.3 - 28TDDT (pg/L) 342 - 1100 240 - 1550 380 - 760TCHLOR (pg/L) 41 - 111 56 - 178 87 - 190Dieldrin 60 - 120 78 - 250 100 - 170
*four samples collected in May 2003 had TPCB concentrations ranging from 890 – 6700 pg/L
Item #7
Preliminary Loading EstimatesLoads are preliminary and were estimated using Regression (REG) and Flow Weighted Mean Concentrations (FWMC). Preliminary estimates of
errors are approximately ± 25%.
REG FWMC REG FWMC REG FWMCWY 2002 6.0 8.2 0.9 1.2 1.8 1.9WY 2003 9.7 13 1.5 1.8 3.0 2.9
Extrapolated to WY 1996 - 2001WY 1995 36 37 4.9 5.3 13 8.7WY 1996 17 23 2.6 3.2 5.3 5.3WY 1997 31 31 4.2 4.4 11 7.1WY 1998 35 39 5.0 5.5 12 9.0WY 1999 15 20 2.3 2.9 4.5 4.7WY 2000 12 16 1.8 2.3 3.5 3.8WY 2001 5.0 6.2 0.7 0.9 1.6 1.4
9 YR AVG 18 21 3 3 6 5
DDT Chlordane Dieldrin PCBs PAHsFWMC FWMC 6 230 23 350
Item #7
Project Sampling Schedule
• WY 2006: Collect “first flush” data and sample storm event over 150,000 cfs
• WY 2007: Sample storm event over 150,000 cfs only*
• WY 2008: Sample storm event over 150,000 cfs only*
• WY 2009: Sample all floods
* With RMP contingency money
Project Reporting Schedule
• 2006 Final Report: 2002–2005 data• 2009 Report sampling results and
reinterpret existing data
Item #7