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Small Tributary Loads
The “Guadalupe River Study”
Lester McKee, John Oram, Jon Leatherbarrow SFEI
Autumn Bonnoma, Mark Stephenson, Wes Heim
MLML
Item #8
Sampling Location
Item #8
Sampling
Item #8
Suspended Sediment Loads
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
2003 2004 2005
Water Year
Su
spen
ded
Sed
imen
t L
oad
(t)
Item #8
HgT v SSC (all data)
1
10
100
1,000
10,000
100,000
1 10 100 1,000 10,000
Suspended Sediment (mg/L)
To
tal M
ercu
ry (
ng
/L)
WY 2003
WY 2004
WY 2005
Item #8
Sources of Mercury
Item #8
HgTmg/kg (ppm)
Total Mercury Loads
0
20
40
60
80
100
120
140
160
180
2003 2004 2005
Water Year
To
tal M
ercu
ry (
kg)
111% MAQ 96% MAQ 133% MAQ
Item #8
Methylmercury Concentrations
0.0
0.5
1.0
1.5
2.0
0 100 200 300 400 500 600 700 800
Suspended Sediment (mg/L)
To
tal M
eth
ylm
ercu
ry (
ng
/L)
Item #8
Methyl Mercury Loads
40 g or 0.5% of total Hg load
Item #8
Bedload Mercury Concentrations
0
0.5
1
1.5
2>3
.8
>2.0
>1.0
>0.5
>0.2
5
>0.1
25
>0.0
625
< 0.
0625
Grain size (mm)
To
tal m
ercu
ry (
mg
/kg
)
Item #8
Bedload Mercury Loads
1% of total Hg load
Grainsize(mm)
<0.5 <1 <2 <4 <8 <16 <32 <64 Total
Percent Finer Than (%) 1 6 15 31 51 75 98 100
Bed Load Sediment Transport (t) 17 83 150 258 333 399 391 33 1,663
Mercury (mg/kg) 0.42 0.24 0.094 0.058 0.029 0.029 0.029 0.029
Bed Load Mercury Transport (g) 7 20 14 15 9 11 11 1 88
Item #8
WY05 Organic Contaminants Concentrations
Range FWMC
WY 2003 3.4 – 90 ng/l 55 ng/l
WY 2004 0.7 – 66 ng/l 26 ng/l
tPBDEs = 2 to 3 x tPCBs
Item #8
Organic Contaminants Loads
Item #8
WY
200
3W
Y 2
004
WY
200
5Discharge SSC
53.1 Mm3
45.3 Mm3
58.0 Mm3
10,805 tons
8,578 tons
4,575 tons
Item #8
tPCBs vs. SSC
WY 2005 samples showed increased separation between rising and falling stages
Item #8
Rising and Falling Stages
tPCBs tPBDEs
Item #8
Project Schedule WY 2005
Report completed read for review
WY 2006 funded by USACE/SCVWD / RMP Complete QAQC for all WYs and get the data on the WWW Write papers for Journal
WY 2007 funded? Only WY 2006 currently guaranteed but everything in place for
continuation RMP funding not yet discussed
Future Modeling (if funding is found)? Explore transport processes in more detail Explore and predict the effects of management on Hg loads
Item #8