1

PCB and PBDE loads at Mallard Island on the Sacramento River:

WYs 2002 - 2006

John Oram, Jon Leatherbarrow, and Lester McKee

Sources Pathways and Loadings WorkgroupNovember 13th 2006

Item #1

2

PCBs and PBDEs at Mallard Island

MODIS 250km True Color Image | January 9, 2006

Item #1

Modified Methods for PBDEs and PCBsModified Methods for PBDEs and PCBs1. Use SSC data from USGS from 1995 to present

• Not applicable for PCBs and PBDEs

2. Use instantaneous SSC and contaminant data to develop a regression relationship (WY 2005-2006)

3. Estimate 15 minute contaminant concentrations4. Calculate daily average concentrations 5. Use linear interpolation to fill data gaps

• Regression not valid, use FWMC

6. Combine estimated daily concentrations with Delta Outflow to estimate daily advective loads

7. Correct loads for the effect of tidal influence and dispersion

Item #1

4

PCBs Item #1

5

PBDEs Item #1

6

PCBs vs SSCWY 02-06

No Significant Relationship Will Use FWMC Instead.

Item #1

7

PBDEs vs SSCWY 04-06

No Significant Relationship Will Use FWMC Instead.

Item #1

8

Item #1

9

Flow Weighted Mean Concentrations

Min Max FWMC (pg/L)

WY02 262.9 877.0 412.4WY03 319.1 6,678.9 573.9 (3,300)*WY04 189.2 620.6 287.7WY05 0.0 892.4 568.8WY06 180.1 971.0 400.8* 4/10/03 - 6/13/03 'Extreme' Event

WY04 733.9 733.9 733.9WY05 429.8 768.4 676.9WY06 19.0 510.3 269.8

PCBs (pg/L)

PBDEs (pg/L)

Item #1

10

LoadsOct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep TOTAL

WY02 0.07 0.16 0.59 0.98 0.23 0.38 0.24 0.29 0.13 0.10 0.06 0.06 3.29WY03 0.09 0.20 0.99 1.83 0.90 0.49 4.10 8.43 2.04 0.27 0.18 0.07 19.59WY04 0.05 0.08 0.39 0.55 1.18 1.02 0.35 0.18 0.10 0.10 0.06 0.05 4.12WY05 0.21 0.14 0.35 1.12 0.71 1.30 0.93 1.79 0.90 0.26 0.13 0.17 8.02WY06 0.08 0.09 0.93 4.15 1.22 2.79 4.56 2.18 0.88 0.25 0.17 0.18 17.48

WY04 0.12 0.21 1.00 1.41 3.02 2.61 0.88 0.46 0.26 0.24 0.16 0.13 10.51WY05 0.25 0.17 0.42 1.33 0.84 1.55 1.11 2.13 1.07 0.31 0.16 0.20 9.54WY06 0.05 0.06 0.62 2.79 0.82 1.88 3.07 1.47 0.59 0.17 0.11 0.12 11.77

WY02 323 602 1,876 2,938 824 1,287 873 1,023 541 429 286 302 11,304WY03 317 538 2,191 3,901 2,029 1,195 1,617 3,176 860 730 521 253 17,328WY04 325 486 1,807 2,435 4,831 4,267 1,611 937 586 555 395 343 18,578WY05 582 434 881 2,504 1,645 2,876 2,130 3,851 2,046 709 423 506 18,587WY06 102 393 2,813 11,689 3,705 8,072 12,819 6,412 2,525 912 593 686 50,721

WY02 0.00 0.01 0.06 0.11 0.02 0.03 0.02 0.02 0.01 0.01 0.00 0.00 0.31WY03 0.00 0.01 0.11 0.17 0.05 0.03 0.04 0.09 0.02 0.01 0.01 0.00 0.55WY04 0.00 0.01 0.04 0.09 0.22 0.18 0.04 0.03 0.01 0.01 0.00 0.00 0.64WY05 0.01 0.00 0.01 0.09 0.03 0.06 0.04 0.10 0.04 0.01 0.01 0.01 0.42WY06 0.00 0.00 0.07 0.64 0.09

PCB Load (kg)

PBDE Load (kg)

Delta Outflow (Mm3)

Sediment Load (Mt)

Item #1

11

Estimating Historic Loads by Linear Regression with Discharge

PCBs = 0.0003*Q + 4.1614

R2 = 0.3135

PBDEs = 5E-05*Q + 9.0191

R2 = 0.8101

0

5

10

15

20

25

0 10000 20000 30000 40000 50000 60000

Annual Discharge (Mm3)

An

nu

al L

oad

(K

g)

PBDEs (Kg)

PCBs (Kg)

Linear (PCBs (Kg))

Linear (PBDEs (Kg))

Item #1

12

Historic Load Estimates

0

5

10

15

20

25

30

PBDEs (Kg)

PCBs (Kg)

PBDEs (Kg) PCBs (Kg)Min 9.17 3.29Max 12.98 27.94Mean 10.20 11.17

Item #1

13

How did WY05 & WY06 compare to previous years?

Annual Discharge (Mm3)Min = 3055 (WY77)

Max = 79269 (WY83)

Mean = 23508

WY06 = 50721WY05 = 18588

Item #1