1

Appendix I Uncertainty/Sensitivity Analysis 

To understand the effect of uncertainty (and the sensitivity) of the key variables on the 

outcome of the model, we ran the model using different values of certain parameters1, and 

then compared the predicted dissolved selenium water column values to the dissolved 

selenium water column values used to determine the proposed criteria. We ran the model 

using different values for partitioning coefficients (Kds), effect (tissue) concentrations, and 

trophic transfer factors (i.e., different diets). These values, the dissolved selenium water 

column values after running the model, and the percent differences from the selenium water 

column values used to determine the proposed criteria are shown in Table 1 for partitioning 

coefficients (Kds), Table 2 for effect concentrations and Table 3 for trophic transfer factors

(TTFs). The model runs using the different Kd values are shown in Tables 1A through 1H; the 

model runs using the different effect concentrations are shown in Tables 2A through 2H; and 

the model runs using the different TTF values are shown in Tables 3A through 3H. 

1. Sensitivity of Partitioning Coefficient (Kd) Values (Table 1)

The model runs used to determine the proposed criteria values are based on the 75th

percentile Kd values of the focused seaward transects for clam-eating fish and bird species, and 

on the 75th percentile Kd values of the landward transects for insect-eating fish species. We ran 

the model using the 25th percentile Kd values for each focused seaward and landward transect, 

and using the maximum Kd value for each focused seaward and landward transect; and then 

compared the dissolved selenium water column values to the dissolved selenium water column 

values using the 75th percentile Kd values for each transect. Using the 25th percentile Kd values 

for each transect, and the maximum Kd values for each transect, the predicted dissolved 

selenium water column values are similar to the dissolved selenium water column values used 

to determine the proposed criteria (i.e., the dissolved water column values using the 75th

percentile Kd values).

For clam-eating fish and birds, for all focused seaward transects, the range of the 25th

percentile Kd values to the maximum Kd values is 946 to 7,725. The corresponding dissolved 

selenium water column values range from 0.115 to 3.059 μg/L, for both clam-eating fish and 

birds. For insect-eating fish, for all landward transects, the range of 25th percentile Kd values to 

the maximum Kd values is 1,629 to 12,650 and the corresponding dissolved selenium water 

column values range from 0.218 to 1.695 μg/L.

 

1

 We changed one parameter at a time, and kept all other parameters the same as those that were used in the 

model runs to determine the proposed criteria (the model runs used to determine the proposed criteria were used 

as a baseline for comparisons). 
2

For individual focused seaward transects, the maximum percent difference between the 

dissolved selenium water column values when using the 25th percentile and the 75th percentile 

Kd values is 65%; the corresponding water column range is 0.2 to 0.4 μg/L for clam-eating fish 

and for clam-eating ducks, and 0.6 to 1.3 μg/L for clam-eating rails. For individual landward 

transects, the maximum percent difference between the dissolved selenium water column 

values when using the 25th percentile and the 75th percentile Kd values is 79%; the 

corresponding water column range is 0.3 to 0.7 μg/L for insect-eating fish. For individual 

focused seaward and landward transects, the maximum percent difference between the 

dissolved selenium water column values using the maximum and 75th percentile Kd values is 

51% and the corresponding water column range is 0.4 to 0.7 μg/L. The maximum percent 

differences of dissolved selenium water column values for all transects are all under 80%. 

2. Sensitivity of Effect (Tissue) Concentration Values (Table 2)

The model runs used to determine the proposed criteria values are based on a fish 

tissue whole body value of 8.5 μg/g dw for fish species, and on an egg tissue value of 12.5 μg/g 

dw for bird species. We ran the model using two different fish tissue whole body values, one 

lower and one higher, 5.0 μg/g dw and 12.0 μg/d dw, for fish species. Similarly, we ran the 

model using two different egg tissue values, one lower and one higher, 7.7 μg/g dw and 16.5 

μg/g dw, for bird species. For each transect, we then compared the predicted dissolved 

selenium water column value for fish and birds to the dissolved selenium water column value

using a fish tissue whole body value of 8.5 μg/g dw for fish and an egg tissue value of 12.5 μg/g 

dw for birds, respectively. Using the low and high fish tissue whole body and egg tissue values 

for each transect for each set of species, the predicted dissolved selenium water column values 

are similar to the water column values used to determine the proposed criteria.

Low Tissue Values: For fish species, using the focused seaward transects for clam-eating 

fish and landward transects for insect-eating fish, and using a 5.0 μg/g dw whole body tissue 

concentration, the model predicted dissolved selenium water column values ranging from 

0.084 μg/L to 0.505 μg/L. For bird species, using the focused seaward transects and using a 7.7 

μg/g dw egg tissue concentration, the model predicted dissolved selenium water column values 

ranging from 0.077 μg/L to 1.261 μg/L.

High Tissue Values: For fish species, using the focused seaward transects for clam-eating 

fish and landward transects for insect-eating fish, and using a 12.0 μg/g dw whole body tissue 

concentration, the model predicted dissolved selenium water column values ranging from 

0.202 μg/L to 1.213 μg/L. For bird species, using the focused seaward transects and using a 

16.5 μg/g dw egg tissue concentration, the model predicted dissolved selenium water column 

values ranging from 0.166 μg/L to 2.701 μg/L. 
3

For fish species, for individual focused seaward transects and landward transects, the 

maximum percent difference between the dissolved selenium water column values when using 

a 5.0 μg/g dw whole body tissue concentration and an 8.5 μg/g dw whole body tissue 

concentration is 52%; the maximum percent difference when using an 8.5 μg/g dw and 12.0 

μg/g dw whole body tissue concentration is 34%. For bird species, for individual focused 

seaward transects, the maximum percent difference between the dissolved selenium water 

column values when using a 7.7 μg/g dw egg tissue concentration and a 12.5 μg/g dw egg tissue 

concentration is 48%; the maximum percent difference when using a 12.5 μg/g dw and 16.5

μg/g dw egg tissue concentration is 28%. The maximum percent differences of dissolved 

selenium water column values are all approximately 50% or lower.

3. Sensitivity of Trophic Transfer Factor (TTF) Values (Table 3)

The model runs used to determine the proposed criteria are based on reasonable 

estimates of diets of the representative species in each category, i.e., for clam-eating fish, 

sturgeon are the representative species; for clam-eating birds, California Ridgeway’s rails and 

diving ducks (scoter and scaup) are representative species; and for insect-eating fish, juvenile 

Chinook salmon and steelhead, and Delta smelt are representative species. For clam-eating 

species, the amount of Corbula in their diet will affect the outcome of model runs, because 

Corbula are very efficient accumulators of selenium, i.e. the trophic transfer factor, TTF, for 

Corbula is high (17) (USGS, 2010). 

Since the availability of food prey species such as Corbula can vary with environmental 

and hydrologic conditions, we ran the model using a low-Corbula diet and a high-Corbula diet 

for clam-eating species, and a low-selenium and a high-selenium diet for insect-eating species. 

For each transect, we then compared the predicted dissolved selenium water column values to 

the dissolved selenium water column values used to determine the proposed criteria (i.e., the 

selenium water column values derived using the best representative diet for each set of 

species). Using the low- and high-Corbula diets for clam-eating fish and birds, and using the 

low- and high-selenium diets for insect-eating fish, for each transect for each set of species, the 

predicted dissolved selenium water column values are similar to the dissolved selenium water 

column values used to determine the proposed criteria.

Clam-eating Fish: To develop protective criteria, a diet of 40% Corbula (TTF = 17) and 

60% annelids and crustaceans (TTF = 1.3) was used, for a weighted TTF of 7.6 (i.e., [0.40 x 17] + 

[0.60 x 1.3] = 7.6) (see Chapter 4 and Appendix F). This represents our current understanding of 

the consumption pattern of sturgeon, the representative species for clam-eating fish living in 

the estuary. To better understand the sensitivity of the model, and specifically the how the 

amount of Corbula in a species’ diet affects the protective selenium values in the water column, 

a diet of 20% Corbula and a diet of 60% Corbula were modeled. A diet lower in Corbula
4

represents environmental conditions where Corbula may be less abundant – or where other 

food sources may be more abundant, while a diet higher in Corbula represents conditions 

where Corbula may be more abundant – or where other food sources may be less abundant. 

For a diet of 20% Corbula and 80% annelids and crustaceans, a TTF of 4.4 was used (i.e., [0.20 x 

17) + [0.80 x 1.3] = 4.4), and for a diet of 60% Corbula and 40% annelids and crustaceans, a TTF 

of 10.7 was used (i.e., [0.60 x 17] + [0.40 x 1.3] = 10.7).

Results: For clam-eating fish eating a low-Corbula (20% Corbula) diet, the model 

predicted dissolved selenium water column values ranging from 0.248 μg/L to 1.242 μg/L; for 

clam-eating fish eating a high-Corbula (60% Corbula) diet, the model predicted dissolved 

selenium water column values ranging from 0.102 μg/L to 0.511 μg/L. 

For clam-eating fish species, for individual focused seaward transects, the percent 

difference between the dissolved selenium water column values when using a 20% (low) 

Corbula diet and a 40% (best representative) Corbula diet is 53%; the percent difference 

between the dissolved selenium water column values when using a 60% (high) Corbula diet and 

a 40% (best representative) Corbula diet is 34%. The maximum percent differences of dissolved 

selenium water column values are approximately 50% or lower.

Clam-eating Birds: To develop protective criteria, two dietary scenarios were modeled: 

one for rails (littoral feeders) and one for diving ducks (sub-tidal feeders) (see Chapter 4 and 

Appendix F). For rails, a diet of 20% Corbula (TTF = 17), 40% other mollusks (TTF = 2.8) and 30% 

insects (TTF = 2.8) was used, for a weighted TTF of 5.42(i.e., [0.20 x 17] + [0.40 x 2.8] + [0.30 x 

2.8] = 5.4). This represents our current understanding of the consumption pattern of California 

Ridgway’s rails living in the estuary. To model a low-Corbula diet and a high-Corbula diet, a diet 

of 5% Corbula, and a diet of 40% Corbula were modeled. For a diet of 5% Corbula, 55% other 

mollusks and 30% insects, a TTF of 3.2 was used (i.e., [0.05 x 17] + [0.55 x 2.8] + [0.30 x 2.8] = 

3.2). For a diet of 40% Corbula, 20% other mollusks and 30% insects, a TTF of 8.2 was used (i.e., 

[0.40 x 17] + [0.20 x 2.8] + [0.30 x 2.8] = 8.2).

For diving ducks, to develop protective criteria, a diet of 45% Corbula (TTF = 17) and 5% 

other animal material (TTF = 2.8) was used, for a weighted TTF of 7.83(i.e., [0.45 x 17] + [0.05 x 

2.8] = 7.8). This represents our current understanding of the consumption pattern of scoter 

and scaup living in the estuary. As with rails, a diet lower in Corbula and a diet higher in 

 

2 The diet of the California Ridgway’s Rail also includes approximately 10% plant material, which is not considered 

a significant source of selenium in their diet and is, therefore, not included in the analysis. 

3

Since scoters and scaups are migratory spending half of the year in the estuary, only 50% of their yearly diet is 

represented. The other half of their diet is consumed outside the estuary and is not considered a significant source 

of selenium.
5

Corbula were modeled to represent conditions where the amount of Corbula and/or other 

available food sources may be different. A diet of 20% Corbula, and a diet of 70% Corbula were 

modeled. For a diet of 20% Corbula and 30% other animal material, a TTF of 4.2 was used (i.e., 

[0.20 x 17] + [0.30 x 2.8] = 4.2). For a diet of 70% Corbula and 5% other plant/animal material, a 

TTF of 12.0 was used (i.e., [0.70 x 17] + [0.05 x 2.8] = 12.0). Scoter and scaup are migratory and 

usually only spend the fall and winter in the estuary, or approximately half of the year; 

therefore, only 50% of their diet is represented in the 20% Corbula diet. A diet of 70% Corbula

and 5% other animal material reflects a longer period of time in the estuary (approximately 

three-quarters of a year).

Results: For clam-eating birds with a low-Corbula diet, the model predicted dissolved 

selenium water column values ranging from 0.233 μg/L to 3.453 μg/L; for clam-eating birds with 

a high-Corbula diet, the model predicted dissolved selenium water column values ranging from 

0.082 μg/L to 1.348 μg/L. 

For clam-eating rails, for individual focused seaward transects, the percent difference 

between the dissolved selenium water column values when using a 5% (low) Corbula diet and a 

20% (best representative) Corbula diet is 51%; the percent difference between the dissolved 

selenium water column values when using a 40% (high) Corbula diet and a 20% (best 

representative) Corbula diet is 41%. The maximum percent differences of dissolved selenium 

water column values are approximately 50% or lower.

For clam-eating ducks, for individual focused seaward transects, the percent difference 

between the dissolved selenium water column values when using a 20% (low) Corbula diet and 

a 45% (best representative) Corbula diet is 60%; the percent difference between the dissolved 

selenium water column values when using a 70% (high) Corbula diet and a 45% (best 

representative) Corbula diet 42%. The maximum percent differences of dissolved selenium 

water column values are 60% or lower. 

Insect-eating Fish: To develop protective criteria, a diet of 100% insects (TTF = 2.8) and a 

TTF of 2.8 was used in the modeling (see Chapter 4 and Appendix F). This represents our 

current understanding of the consumption pattern of juvenile Chinook salmon and steelhead, 

and Delta smelt, the representative species for insect-eating fish living in the estuary. To model 

a low-selenium diet, a diet of 50% insects (TTF = 2.8) and 50% amphipods (TTF = 0.6) for a 

weighted TTF of 1.6 was used (i.e., [0.50 x 2.8] + [0.50 x 0.6] = 1.6); and to model a highselenium diet, a diet of unknown prey with a TTF = 6.0 was used. 

Results: For insect-eating fish eating a low-selenium diet, the model predicted dissolved 

selenium water column values ranging from 0.564 μg/L to 1.504 μg/L; for insect-eating fish 
6

eating a high-selenium diet, the model predicted dissolved selenium water column values 

ranging from 0.150 μg/L to 0.401 μg/L. 

For insect-eating fish, for individual landward transects, the percent difference between 

the dissolved selenium water column values when using a low-selenium diet and a 100% insect 

diet is 55%; the percent difference between the dissolved selenium water column values when 

using a high-selenium diet and a 100% insect diet is 73%. The maximum percent differences of 

dissolved selenium water column values are 73% or lower.

4. Uncertainty/Sensitivity

In all three comparisons, the maximum percent differences of dissolved selenium water 

column values of the low and high scenarios with the scenarios used to determine the 

proposed criteria were all under 80%, and most were approximately 50% or lower. The 

maximum percent difference of dissolved selenium water column values when using the 25th

and 75th percentile Kds was 65% for focused seaward transects (approximately 0.2 – 0.4 μg/L for 

clam-eating fish and ducks and 0.6 – 1.2 μg/L for rails), and 79% for landward transects

(approximately 0.3 – 0.7 μg/L). The percent difference of dissolved selenium water column 

values when using the maximum and 75th percentile Kds ranged from 8% to 51% with most 

around 15% or lower. The differences in the water column values are not significant.

The maximum percent difference of dissolved selenium water column values when 

using a lower tissue concentration (5.0 v. 8.5 μg/g dw for whole body fish tissue and 7.7 v. 12.5

μg/g dw for egg tissue) was 52% for fish and 48% for birds (most water column values between 

0.1 and 0.7 μg/L). The maximum percent difference of dissolved selenium water column values 

when using a higher tissue concentration (12.0 v. 8.5 μg/g dw for whole body fish tissue and 

16.5 v. 12.5 μg/g dw for egg tissue) was 34% for fish and 28% for birds (most water column 

values between 0.2 – 1.0 μg/L). Lastly, for clam-eating fish and birds, the percent difference of 

dissolved selenium water column values between a low-selenium (low Corbula) diet and a 

representative diet was 54% for fish and 51-60% for birds (most water column values between 

0.2 and 1.2 μg/L). The percent difference of a high-selenium (high Corbula) diet and a 

representative diet was 34% for clam-eating fish and 41-43% for clam-eating birds (most water 

column values between 0.2 and 1.2 μg/L). For insect-eating fish, the percent difference of 

dissolved selenium water column values between a low-selenium diet and a 100% insect diet 

was 55% (water column values between 0.3 and 1.5 μg/L), and the percent difference between 

a high-selenium diet and a 100% insect diet was 73% (water column values between 0.3 and 0.8 

μg/L). In all cases, the range of water column values is within a reasonable and close proximity 

to the proposed water column criterion. 
7

Appendix I Uncertainty/Sensitivity Analysis: Table 1 Partitioning Coefficients – Focused Seaward Transects/Landward Transects

Representative 

Species

Effect Level/

Value

Representative

Diet and TTFs

Transect Date

Water Yr Type/

Flow Season

Kd –

75th

Percentile

 

Predicted 

Dissolved 

Se (μg/l)

 

Kd –

25th

Percentile

(Table 1A)

Predicted 

Dissolved 

Se (μg/l)

(Table 1A)

Kd -

Max

(Table1B)

Predicted 

Dissolved 

Se (μg/l)

(Table 1B)

Range:

25th – 75th

Percentiles: 

Dissolved Se

(μg/l)

Percent 

Difference:

25th- 75th

Percentiles

 

Range:

75th- Max

Percentiles:

Dissolved Se

(μg/l)

Percent 

Difference:

75th- Max 

Percentiles

 

Clam-Eating 

Fish:

Green Sturgeon 

White Sturgeon

Sacramento 

Splittail

EC10 /

8.5 WB μg/g dw

40% Corbula

60% Annelids/

Crustaceans

TTF(prey) =7.6

TTF(fish) = 1.1

June 1998

Wet/ High 1,414 0.719 946 1.075 1,647 0.617 1.075 – 0.719 40% 0.719 – 0.617 15%

Oct 1998

Wet/Low 4,498 0.226 2,286 0.445 5,212 0.195 0.445 – 0.226 65% 0.226 – 0.195 15%

April 1999

Wet/High 2,861 0.355 2,414 0.421 3,168 0.321 0.421 – 0.355 17% 0.355 – 0.321 10%

Nov 1999

Above Norm/Low 7,089 0.143 5,019 0.203 7,725 0.132 0.203 – 0.143 35% 0.143 – 0.132 8%

Mean 3,966 0.256 2,666 0.381 4,438 0.229 0.381 – 0.256 39% 0.256 – 0.229 11%

(Table 1C) (Table 1C) (Table 1D) (Table 1D)

Clam-Eating 

Birds:

California 

Ridgway’s Rail

EC10 /

12.5 Egg Tissue

μg/g dw

20% Corbula

40% Other 

Mollusk

30% Insect

(10% Plant)

TTF(prey) = 5.4

TTF(egg) = 0.8

June 1998

Wet/ High 1,414 2.046 946 3.059 1,647 1.757 3.059 – 2.046 40% 2.046 - 1.757 15%

Oct 1998

Wet/Low 4,498 0.643 2,286 1.266 5,212 0.555 1.266 - 0.643 65% 0.643 – 0.555 15%

April 1999

Wet/High 2,861 1.011 2,414 1.199 3,168 0.913 1.199 – 1.011 17% 1.011 – 0.913 10%

Nov 1999

Above Norm/Low 7,089 0.408 5,019 0.577 7,725 0.375 0.577 – 0.408 34% 0.408 – 0.375 8%

Mean 3,966 0.730 2,666 1.085 4,438 0.652 1.085 – 0.730 39% 0.730 – 0.652 11%

(Table 1E) (Table 1E) (Table 1F) (Table 1F)

Clam-Eating 

Birds:

Scaup

Scoter

EC10 /

12.5 Egg Tissue 

μg/g dw

45% Corbula

5% Other Animal

(1/2 yr resident)

TTF(prey) =7.8

TTF(egg) = 1.8

June 1998

Wet/ High 1,414 0.630 946 0.941 1,647 0.541 0.941 - 0.630 40% 0.630-0.541 15%

Oct 1998

Wet/Low 4,498 0.198 2,286 0.389 5,212 0.171 0.389 – 0.198 65% 0.198-0.171 15%

April 1999

Wet/High 2,861 0.311 2,414 0.369 3,168 0.281 0.369 – 0.311 17% 0.311-0.281 10%

Nov 1999

Above Norm/Low 7,089 0.126 5,019 0.177 7,725 0.115 0.177 – 0.126 34% 0.126-0.115 9%

Mean 3,966 0.224 2,666 0.334 4,438 0.201 0.334 – 0.224 39% 0.224-0.201 11%

(Table 1G) (Table 1G) (Table 1H) (Table 1H)

Insect Eating 

Fish:

Chinook Salmon 

(juvenile)

Steelhead Trout 

(juvenile)

Delta Smelt

EC10 /

8.5 WB μg/g dw

100% Insect 

TTF(insect) = 2.8

TTF(fish) = 1.1

January 2003

Above Norm/High 3,212 0.859 1,628 1.695 3,503 0.788 1.695 – 0.859 65% 0.859 – 0.788 9%

April 2003

Above Norm/High 3,564 0.774 1,898 1.454 4,351 0.634 1.454 – 0.774 61% 0.774 – 0.634 20%

October 2003

Below Norm/Low 8,569 0.322 3,712 0.743 12,650 0.218 0.743 – 0.322 79% 0.322 – 0.218 39%

January 2004

Below Norm/High 3,808 0.725 1,748 1.579 6,398 0.431 1.579 – 0.725 74% 0.725 – 0.431 51%

Mean 4,788 0.576 2,247 1.228 6,273 0.440 1.228 – 0.576 72% 0.576 – 0.440 27%
8

Appendix I Uncertainty/Sensitivity Analysis: Table 2 Effect Concentrations – Focused Seaward Transects/Landward Transects

Representative 

Species

Representative

Diet and TTFs

Transect Date

Water Yr Type/

Flow Season

Kd –

75th

Perce

ntile

Effect 

Value (EV)

EC10

(μg/g dw)

 

Predicted 

Dissolved

Se (μg/l)

 

Effect 

Value

(Low)

(μg/g dw)

(Table 2A)

Predicted 

Dissolved 

Se (μg/l)

(Table 2A)

Effect 

Value

(High)

(μg/g dw)

(Table 2B)

Predicted 

Dissolved 

Se (μg/l)

(Table 2B)

Range:

EV EC10 –

 EV (Low):

Dissolved Se

(μg/l)

Percent 

Difference:

EV EC10 –

 EV (Low)

 

Range:

EV (High) –

 EV EC10:

Dissolved Se

(μg/l)

Percent 

Difference:

EV (High) –

 EV EC10

 

Clam-Eating 

Fish:

Green Sturgeon 

White Sturgeon

Sacramento 

Splittail

40% Corbula

60% Annelids/

Crustaceans

TTF(prey) =7.6

TTF(fish) = 1.1

June 1998

Wet/ High 1,414 8.5 WB 0.719 5.0 WB 0.423 12.0 WB 1.015 0.719 - 0.423 52% 1.015 – 0.719 34%

Oct 1998

Wet/Low 4,498 8.5 WB 0.226 5.0 WB 0.133 12.0 WB 0.319 0.226 - 0.133 52% 0.319 – 0.226 34%

April 1999

Wet/High 2,861 8.5 WB 0.355 5.0 WB 0.209 12.0 WB 0.502 0.355 - 0.209 52% 0.502 – 0.355 34%

Nov 1999

Abv Norm/Low 7,089 8.5 WB 0.143 5.0 WB 0.084 12.0 WB 0.202 0.143 – 0.084 52% 0.202 – 0.143 34%

Mean 3,966 8.5 WB 0.256 5.0 WB 0.151 12.0 WB 0.362 0.256 - 0.151 52% 0.362 – 0.256 34%

(Table 2C) (Table 2C) (Table 2D) (Table 2D)

Clam-Eating 

Birds:

California 

Ridgeway’s Rail

20% Corbula

40% Other 

Mollusk

30% Insect

(10% Plant)

TTF(prey) =5.4

TTF(egg) = 0.8

June 1998

Wet/ High 1,414 12.5 Egg 2.046 7.7 Egg 1.261 16.5 Egg 2.701 2.046 – 1.261 47% 2.701 – 2.046 28%

Oct 1998

Wet/Low 4,498 12.5 Egg 0.643 7.7 Egg 0.396 16.5 Egg 0.849 0.643 – 0.396 48% 0.849 – 0.643 28%

April 1999

Wet/High 2,861 12.5 Egg 1.011 7.7Egg 0.623 16.5 Egg 1.335 1.011 – 0.623 47% 1.335 – 1.011 28%

Nov 1999

Abv Norm/Low 7,089 12.5 Egg 0.408 7.7 Egg 0.251 16.5 Egg 0.539 0.408 – 0.251 48% 0.539 – 0.408 28%

Mean 3,966 12.5 Egg 0.730 7.7 Egg 0.449 16.5 Egg 0.963 0.730 – 0.449 48% 0.963 – 0.730 28%

(Table 2E) (Table 2E) (Table 2F) (Table 2F)

Clam-Eating 

Birds:

Scaup

Scoter

45% Corbula

5% Other 

Animal

(1/2 yr 

resident)

TTF(prey) =7.8

TTF(egg) = 1.8

June 1998

Wet/ High 1,414 12.5 Egg 0.630 7.7 Egg 0.388 16.5 Egg 0.831 0.630 – 0.388 48% 0.831 – 0.630 28%

Oct 1998

Wet/Low 4,498 12.5 Egg 0.198 7.7 Egg 0.122 16.5 Egg 0.261 0.198 – 0.122 48% 0.261 – 0.198 27%

April 1999

Wet/High 2,861 12.5 Egg 0.311 7.7 Egg 0.192 16.5 Egg 0.411 0.311 – 0.192 47% 0.411 – 0.311 28%

Nov 1999

Abv Norm/Low 7,089 12.5 Egg 0.126 7.7 Egg 0.077 16.5 Egg 0.166 0.126 – 0.077 48% 0.166 – 0.126 27%

Mean 3,966 12.5 Egg 0.224 7.7 Egg 0.138 16.5 Egg 0.296 0.224 – 0.138 48% 0.296 – 0.224 28%

(Table 2G) (Table 2G) (Table 2H) (Table 2H)

Insect Eating 

Fish:

Chinook Salmon 

(juvenile)

Steelhead Trout 

(juvenile)

Delta Smelt

100% Insect 

TTF(insect) = 2.8

TTF(fish) = 1.1

January 2003

Abv Norm/High 3,212 8.5 WB 0.859 5.0 WB 0.505 12.0 WB 1.213 0.859 – 0.505 52% 1.213 – 0.859 34%

April 2003

Abv Norm/High 3,564 8.5 WB 0.774 5.0 WB 0.455 12.0 WB 1.093 0.774 – 0.455 52% 1.093 – 0.774 34%

October 2003

Blw Norm/Low 8,569 8.5 WB 0.322 5.0 WB 0.189 12.0 WB 0.455 0.322 – 0.189 52% 0.455 – 0.322 34%

January 2004

Blw Norm/High 3,808 8.5 WB 0.725 5.0 WB 0.426 12.0 WB 1.023 0.725 – 0.426 52% 1.023 – 0.725 34%

Mean 4,788 8.5 WB 0.576 5.0 WB 0.339 12.0 WB 0.814 0.576 – 0.339 52% 0.814 – 0.576 34%
9

Appendix I Uncertainty/Sensitivity Analysis: Table 3 Diet / Trophic Transfer Factors – Focused Seaward Transects /Landward Transects

Representative 

Species

Effect 

Level/

Value

Transect Date

Water Yr Type/

Flow Season

Kd –

75th

Percentile

Representative

(Rep) Diet and 

Representative 

(Rep) TTFs 

Predicted 

Dissolved

Se (μg/l)

 

Low Corbula / 

Low Selenium

Diet and TTFs

(Low TTF(prey))

(Table 3A)

Predicted 

Dissolved 

Se (μg/l)

 

(Table 3A)

High Corbula / 

High Selenium 

Diet and TTFs

(High TTF(prey))

(Table 3B)

Predicted 

Dissolved 

Se (μg/l)

 

(Table 3B)

Range: 

Low Diet –

 Rep Diet:

Dissolved Se

(μg/l)

Percent 

Difference:

Low Diet –

 Rep Diet

Range: 

Rep Diet –

 High Diet: 

Dissolved Se

(μg/l)

Percent 

Difference:

Rep Diet –

 High Diet

Clam-Eating 

Fish:

Green Sturgeon 

White Sturgeon

Sacramento 

Splittail

EC10/

8.5 WB 

μg/g dw

June 1998

Wet/ High 1,414 40% Corbula

60% Annelids/

Crustaceans

TTF(prey) = 7.6

TTF(fish) = 1.1

0.719 20% Corbula

80% Annelids/

Crustaceans

TTF(prey) = 4.4

TTF(fish) = 1.1 

1.242 60% Corbula

40% Annelids/

Crustaceans

TTF(prey) = 10.7

TTF(fish) = 1.1

0.511 1.242 –0.719 53% 0.719 –0.511 34%

Oct 1998

Wet/Low 4,498 0.226 0.390 0.161 0.390 –0.226 53% 0.226 -0.161 34%

April 1999

Wet/High 2,861 0.355 0.614 0.252 0.614 -0.355 53% 0.355 -0.252 34%

Nov 1999

Abv Norm/Low 7,089 0.143 0.248 0.102 0.248 -0.143 54% 0.143 -0.102 33%

Mean 3,966 0.256 0.443 0.182 0.443 -0.256 54% 0.256 -0.182 34%

(Table 3C) (Table 3C) (Table 3D) (Table 3D)

Clam-Eating 

Birds:

California 

Ridgeway’s Rail

EC10/

12.5 Egg 

Tissue

μg/g dw

June 1998

Wet/ High 1,414 20% Corbula

40% Other 

Mollusk

30% Insect

(10% Plant)

TTF(prey) = 5.4

TTF(egg) = 0.8

2.046 5% Corbula

55% Other 

Mollusk

30% Insect

(10% Plant)

TTF(prey) = 3.2

TTF(egg) = 0.8

3.453 40% Corbula

20% Other 

Mollusk

30% Insect

(10% Plant)

TTF(prey) = 8.2

TTF(egg) = 0.8

1.348 3.453 -2.046 51% 2.046-1.348 41%

Oct 1998

Wet/Low 4,498 0.643 1.086 0.424 1.086 -0.643 51% 0.643-0.424 41%

April 1999

Wet/High 2,861 1.011 1.707 0.666 1.707 -1.011 51% 1.011-0.666 41%

Nov 1999

Abv Norm/Low 7,089 0.408 0.689 0.269 0.689 -0.408 51% 0.408-0.269 41%

Mean 3,966 0.730 1.231 0.480 1.231-0.730 51% 0.730-0.480 41%

(Table 3E) (Table 3E) (Table 3F) (Table 3F)

Clam-Eating 

Birds:

Scaup

Scoter

EC10/

12.5 Egg 

Tissue

μg/g dw

June 1998

Wet/ High 1,414 45% Corbula

5% Other 

Animal

(1/2 year 

resident)

TTF(prey) =7.8

TTF(egg) = 1.8

0.630 20% Corbula

30% Other 

Animal

(1/2 year 

resident)

TTF(prey) = 4.2

TTF(egg) = 1.8

1.169 70% Corbula

5% Other 

Animal

(3/4 year 

resident)

TTF(prey) = 12.0

TTF(egg) = 1.8

0.409 1.169 -0.630 60% 0.630 –0.409 43%

Oct 1998

Wet/Low 4,498 0.198 0.368 0.129 0.368 -0.198 60% 0.198 -0.129 42%

April 1999

Wet/High 2,861 0.311 0.578 0.202 0.578 -0.311 60% 0.311 -0.202 42%

Nov 1999

Abv Norm/Low 7,089 0.126 0.233 0.082 0.233 -0.126 60% 0.126 -0.082 42%

Mean 3,966 0.224 0.417 0.146 0.417 -0.224 60% 0.224 -0.146 42%

(Table 3G) (Table 3G) (Table 3H) (Table 3H)

Insect Eating 

Fish:

Chinook Salmon 

(juvenile)

Steelhead Trout 

(juvenile)

Delta Smelt

EC10/

8.5 WB 

μg/g dw

January 2003

Abv Norm/High 3,212 100% Insect 

TTF(insect) = 2.8

TTF(fish) = 1.1

0.859 50% Insect

50% Amphipod

TTF(prey) = 1.6

TTF(fish) = 1.1

1.504 (Unknown prey 

/ concentrated 

source of se)

TTF(prey) = 6.0

TTF(fish) = 1.1

0.401 1.504 -0.859 55% 0.859 -0.401 73%

April 2003

Abv Norm/High 3,564 0.774 1.355 0.361 1.355 -0.774 55% 0.774 -0.361 73%

October 2003

Blw Norm/Low 8,569 0.322 0.564 0.150 0.564 -0.322 55% 0.322 -0.150 73%

January 2004

Blw Norm/High 3,808 0.725 1.268 0.338 1.268 -0.725 54% 0.725 -0.338 73%

Mean 4,788 0.576 1.009 0.269 1.009 -0.576 55% 0 576 -0.269 73%
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile Kd

Mean Kd Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 25th Kd Focused Seaward 2666 0.381 1.017 7.7 8.5 Fish (Clam) Target 8.5 ug/g

Prey TTF 7.6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.494 1.017 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.075 1.017 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.269 1.017 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.445 1.017 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.313 1.017 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.421 1.017 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.173 1.017 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.203 1.017 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.625 1.017 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.536 1.017 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.274 1.017 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.582 1.017 7.7 8.5

Appendix I

Table 1A Focused Seaward Clam-Eating Fish - 25th Percentile Kds (Blue) 

10
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile Kd

Mean Kd Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean Max Kd Focused Seaward 4438 0.229 1.017 7.7 8.5 Fish (Clam) Target 8.5 ug/g

Prey TTF 7.6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.092 1.017 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.617 1.017 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.038 1.017 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.195 1.017 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.076 1.017 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.321 1.017 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.051 1.017 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.132 1.017 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.290 1.017 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.234 1.017 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.080 1.017 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.159 1.017 7.7 8.5

Appendix I

Table 1B Focused Seaward Clam-Eating Fish - Max Kds (Blue)

11
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 25th Kd Focused Seaward 2666 1.085 2.894 15.6 12.5 Rail (Clam) Target 12.5 ug/g

Prey TTF 5.4 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.405 2.894 15.6 12.5 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 3.059 2.894 15.6 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.765 2.894 15.6 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 1.266 2.894 15.6 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.889 2.894 15.6 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 1.199 2.894 15.6 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.491 2.894 15.6 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.577 2.894 15.6 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.777 2.894 15.6 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.525 2.894 15.6 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.780 2.894 15.6 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.655 2.894 15.6 12.5

Appendix I 

Table 1C Focused Seaward Clam-Eating Rail - 25th Percentile Kds (Blue)

12
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean Kd Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean Max Kd Focused Seaward 4438 0.652 2.894 15.6 12.5 Rail (Clam) Target 12.5 ug/g

Prey TTF 5.4 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.262 2.894 15.6 12.5 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.757 2.894 15.6 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.108 2.894 15.6 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.555 2.894 15.6 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.217 2.894 15.6 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.913 2.894 15.6 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.146 2.894 15.6 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.375 2.894 15.6 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.826 2.894 15.6 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.665 2.894 15.6 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.229 2.894 15.6 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.452 2.894 15.6 12.5

Appendix I

Table 1D Focused Seaward Clam-Eating Rail - Max Kds (Blue)

13
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean Kd Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 25th Kd Focused Seaward 2666 0.334 0.890 6.9 12.5 Duck (Clam) Target 12.5 ug/g

Prey TTF 7.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.432 0.890 6.9 12.5 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.941 0.890 6.9 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.235 0.890 6.9 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.389 0.890 6.9 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.274 0.890 6.9 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.369 0.890 6.9 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.151 0.890 6.9 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.177 0.890 6.9 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.547 0.890 6.9 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.469 0.890 6.9 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.240 0.890 6.9 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.509 0.890 6.9 12.5

Appendix I

Table 1E Focused Seaward Clam-Eating Duck - 25th Percentile Kds (Blue)

14
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean Max Kd Focused Seaward 4438 0.201 0.890 6.9 12.5 Duck (Clam) Target 12.5 ug/g

Prey TTF 7.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.081 0.890 6.9 12.5 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.541 0.890 6.9 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.033 0.890 6.9 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.171 0.890 6.9 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.067 0.890 6.9 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.281 0.890 6.9 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.045 0.890 6.9 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.115 0.890 6.9 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.254 0.890 6.9 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.205 0.890 6.9 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.070 0.890 6.9 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.139 0.890 6.9 12.5

Appendix I

Table 1F Focused Seaward Clam-Eating Duck - Max Kds (Blue)

15
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 25th Kd Landward 2247 1.228 2.760 7.7 8.5 Fish (Insect) Target 8.5 ug/g

Prey TTF 2.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.340 2.760 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 2.917 2.760 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.730 2.760 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 1.207 2.760 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.848 2.760 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 1.143 2.760 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.468 2.760 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.550 2.760 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.695 2.760 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.454 2.760 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.743 2.760 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.579 2.760 7.7 8.5

Appendix I

Table 1G Landward Insect-Eating Fish - 25th Percentile Kds (Blue)

16
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean Max Kd Landward 6273 0.440 2.760 7.7 8.5 Fish (Insect) Target 8.5 ug/g

Prey TTF 2.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.250 2.760 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.676 2.760 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.103 2.760 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.529 2.760 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.207 2.760 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.871 2.760 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.139 2.760 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.357 2.760 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.788 2.760 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.634 2.760 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.218 2.760 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.431 2.760 7.7 8.5

Appendix I

Table 1H Landward Insect-Eating Fish - Max Kds (Blue)

17
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.151 0.598 4.5 5.0 Fish (Clam) Target 5.0 μg/g

Prey TTF 7.6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.240 0.598 4.5 5.0 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.423 0.598 4.5 5.0

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.092 0.598 4.5 5.0

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.133 0.598 4.5 5.0

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.084 0.598 4.5 5.0

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.209 0.598 4.5 5.0

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.074 0.598 4.5 5.0

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.084 0.598 4.5 5.0

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.186 0.598 4.5 5.0

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.168 0.598 4.5 5.0

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.070 0.598 4.5 5.0

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.157 0.598 4.5 5.0

Appendix I

Table 2A Focused Seaward Clam-Eating Fish - 5.0 Whole Body (Blue)

18
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.362 1.435 10.9 12.0 Fish (Clam) Target 12.0 μg/g

Prey TTF 7.6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.576 1.435 10.9 12.0 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.015 1.435 10.9 12.0

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.220 1.435 10.9 12.0

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.319 1.435 10.9 12.0

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.201 1.435 10.9 12.0

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.502 1.435 10.9 12.0

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.177 1.435 10.9 12.0

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.202 1.435 10.9 12.0

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.447 1.435 10.9 12.0

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.403 1.435 10.9 12.0

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.168 1.435 10.9 12.0

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.377 1.435 10.9 12.0

Appendix I

Table 2B Focused Seaward Clam-Eating Fish - 12.0 Whole Body (Blue)

19
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.449 1.782 9.6 7.7 Rail (Clam) Target 7.7 μg/g

Prey TTF 5.4 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.716 1.782 9.6 7.7 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.261 1.782 9.6 7.7

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.273 1.782 9.6 7.7

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.396 1.782 9.6 7.7

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.249 1.782 9.6 7.7

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.623 1.782 9.6 7.7

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.220 1.782 9.6 7.7

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.251 1.782 9.6 7.7

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.555 1.782 9.6 7.7

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.500 1.782 9.6 7.7

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.208 1.782 9.6 7.7

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.468 1.782 9.6 7.7

Appendix I

Table 2C Focused Seaward Clam-Eating Rail - 7.7 Egg Tissue (Blue)

20
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.963 3.819 20.6 16.5 Rail (Clam) Target 16.5 μg/g

Prey TTF 5.4 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.533 3.819 20.6 16.5 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 2.701 3.819 20.6 16.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.585 3.819 20.6 16.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.849 3.819 20.6 16.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.534 3.819 20.6 16.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 1.335 3.819 20.6 16.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.471 3.819 20.6 16.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.539 3.819 20.6 16.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.189 3.819 20.6 16.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.072 3.819 20.6 16.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.446 3.819 20.6 16.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.003 3.819 20.6 16.5

Appendix I

Table 2D Focused Seaward Clam-Eating Rail - 16.5 Egg Tissue (Blue)

21
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.138 0.548 4.3 7.7 Duck (Clam) Target 7.7 μg/g

Prey TTF 7.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.220 0.548 4.3 7.7 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.388 0.548 4.3 7.7

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.084 0.548 4.3 7.7

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.122 0.548 4.3 7.7

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.077 0.548 4.3 7.7

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.192 0.548 4.3 7.7

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.068 0.548 4.3 7.7

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.077 0.548 4.3 7.7

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.171 0.548 4.3 7.7

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.154 0.548 4.3 7.7

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.064 0.548 4.3 7.7

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.144 0.548 4.3 7.7

Appendix I

Table 2E Focused Seaward Clam-Eating Duck - 7.7 Egg Tissue (Blue)

22
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.296 1.175 9.2 16.5 Duck (Clam) Target 16.5 μg/g

Prey TTF 7.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.472 1.175 9.2 16.5 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.831 1.175 9.2 16.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.180 1.175 9.2 16.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.261 1.175 9.2 16.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.164 1.175 9.2 16.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.411 1.175 9.2 16.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.145 1.175 9.2 16.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.166 1.175 9.2 16.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.366 1.175 9.2 16.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.330 1.175 9.2 16.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.137 1.175 9.2 16.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.309 1.175 9.2 16.5

Appendix I

Table 2F Focused Seaward Clam-Eating Duck - 16.5 Egg Tissue (Blue)

23
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean Kd Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 4788 0.339 1.623 4.5 5.0 Fish (Insect) Target 5.0 μg/g

Prey TTF 2.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.652 1.623 4.5 5.0 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.148 1.623 4.5 5.0

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.249 1.623 4.5 5.0

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.361 1.623 4.5 5.0

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.227 1.623 4.5 5.0

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.567 1.623 4.5 5.0

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.200 1.623 4.5 5.0

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.229 1.623 4.5 5.0

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.505 1.623 4.5 5.0

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.455 1.623 4.5 5.0

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.189 1.623 4.5 5.0

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.426 1.623 4.5 5.0

Appendix I

Table 2G Landward Insect-Eating Fish - 5.0 Whole Body (Blue)

24
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 4788 0.814 3.896 10.9 12.0 Fish (Insect) Target 12.0 μg/g

Prey TTF 2.8 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.564 3.896 10.9 12.0 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 2.755 3.896 10.9 12.0

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.597 3.896 10.9 12.0

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.866 3.896 10.9 12.0

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.545 3.896 10.9 12.0

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 1.362 3.896 10.9 12.0

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.480 3.896 10.9 12.0

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.550 3.896 10.9 12.0

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.213 3.896 10.9 12.0

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.093 3.896 10.9 12.0

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.455 3.896 10.9 12.0

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.023 3.896 10.9 12.0

Appendix I

Table 2H Landward Insect-Eating Fish - 12.0 Whole Body (Blue)

25
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.443 1.756 7.7 8.5 Fish (Clam) Target 8.5 ug/g

Prey TTF 4.4 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.705 1.756 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.242 1.756 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.269 1.756 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.390 1.756 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.246 1.756 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.614 1.756 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.216 1.756 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.248 1.756 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.547 1.756 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.493 1.756 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.205 1.756 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.461 1.756 7.7 8.5

Appendix I

Table 3A Focused Seaward Clam-Eating Fish - Low Corbula Diet (Blue)

26
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.182 0.722 7.7 8.5 Fish (Clam) Target 8.5 ug/g

Prey TTF 10.7 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.290 0.722 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.511 0.722 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.111 0.722 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.161 0.722 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.101 0.722 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.252 0.722 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.089 0.722 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.102 0.722 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.225 0.722 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.203 0.722 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.084 0.722 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.190 0.722 7.7 8.5

Appendix I

Table 3B Focused Seaward Clam-Eating Fish - High Corbula Diet (Blue)

27
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 1.231 4.883 15.6 12.5 Rail (Clam) Target 12.5 ug/g

Prey TTF 3.2 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.960 4.883 15.6 12.5 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 3.453 4.883 15.6 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.748 4.883 15.6 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 1.086 4.883 15.6 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.683 4.883 15.6 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 1.707 4.883 15.6 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.602 4.883 15.6 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.689 4.883 15.6 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.520 4.883 15.6 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.370 4.883 15.6 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.570 4.883 15.6 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.282 4.883 15.6 12.5

Appendix I 

Table 3C Focused Seaward Clam-Eating Rail - Low Corbula Diet (Blue)

28
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.480 1.905 15.6 12.5 Rail (Clam) Target 12.5 ug/g

Prey TTF 8.2 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.765 1.905 15.6 12.5 Egg TTF 0.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.348 1.905 15.6 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.292 1.905 15.6 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.424 1.905 15.6 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.266 1.905 15.6 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.666 1.905 15.6 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.235 1.905 15.6 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.269 1.905 15.6 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.593 1.905 15.6 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.535 1.905 15.6 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.222 1.905 15.6 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.500 1.905 15.6 12.5

Appendix I

Table 3D Focused Seaward Clam-Eating Rail - High Corbula Diet (Blue)

29
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.417 1.653 6.9 12.5 Duck (Clam) Target 12.5 ug/g

Prey TTF 4.2 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.664 1.653 6.9 12.5 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 1.169 1.653 6.9 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.253 1.653 6.9 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.368 1.653 6.9 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.231 1.653 6.9 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.578 1.653 6.9 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.204 1.653 6.9 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.233 1.653 6.9 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.515 1.653 6.9 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.464 1.653 6.9 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.193 1.653 6.9 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.434 1.653 6.9 12.5

Appendix I

Table 3E Focused Seaward Clam-Eating Duck - Low Corbula Diet (Blue)

30
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Focused Seaward 3966 0.146 0.579 6.9 12.5 Duck (Clam) Target 12.5 ug/g

Prey TTF 12 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.232 0.579 6.9 12.5 Egg TTF 1.8 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.409 0.579 6.9 12.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.089 0.579 6.9 12.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.129 0.579 6.9 12.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.081 0.579 6.9 12.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.202 0.579 6.9 12.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.071 0.579 6.9 12.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.082 0.579 6.9 12.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.180 0.579 6.9 12.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.162 0.579 6.9 12.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.068 0.579 6.9 12.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.152 0.579 6.9 12.5

Appendix I

Table 3F Focused Seaward Clam-Eating Duck - High Corbula Diet (Blue)

31
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Landward 4788 1.009 4.830 7.7 8.5 Fish (Insect) Target 8.5 ug/g

Prey TTF 1.6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 1.939 4.830 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward712 946 1180 1180 1414 1647 3.416 4.830 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.740 4.830 7.7 8.5

wet/low Oct-98 Focused Seaward2202 2286 3435 3111 4498 5212 1.074 4.830 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.675 4.830 7.7 8.5

wet/high Apr-99 Focused Seaward2274 2414 2666 2555 2861 3168 1.688 4.830 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.595 4.830 7.7 8.5

normal/low Nov-99 Focused Seaward3496 5019 5986 6142 7089 7725 0.681 4.830 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 1.504 4.830 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 1.355 4.830 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.564 4.830 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 1.268 4.830 7.7 8.5

Appendix I 

Table 3G Landward Insect-Eating Fish - Low TTF/Se Diet (Blue)

32
Water Year/ Flow 

Season

Month-Year Transect Min Kd 25th 

percentile 

Kd

Mean 

Kd

Median 

Kd

75th 

percentile 

Kd

Max Kd Allowable 

Dissolved 

Se Conc 

(ug/L)

Predicted 

Allowable 

Particulate Se 

Conc (ug/g dw)

Predicted 

Allowable Inv 

Se Conc 

(ug/g dw)

Predicted 

Tissue Se 

Conc 

(ug/g dw) Name Value Units

Mean 75th Kd Landward 4788 0.269 1.288 7.7 8.5 Fish (Insect) Target 8.5 ug/g

Prey TTF 6 dimensionless

wet/high Jun-98 Seaward 712 2059 3198 2330 2491 11054 0.517 1.288 7.7 8.5 Fish TTF 1.1 dimensionless

wet/high Jun-98 Focused Seaward 712 946 1180 1180 1414 1647 0.911 1.288 7.7 8.5

wet/low Oct-98 Seaward 2202 3782 6501 4963 6525 26912 0.197 1.288 7.7 8.5

wet/low Oct-98 Focused Seaward 2202 2286 3435 3111 4498 5212 0.286 1.288 7.7 8.5

wet/high Apr-99 Seaward 1151 3253 5824 5252 7151 13317 0.180 1.288 7.7 8.5

wet/high Apr-99 Focused Seaward 2274 2414 2666 2555 2861 3168 0.450 1.288 7.7 8.5

normal/low Nov-99 Seaward 3496 5893 7614 6569 8114 19785 0.159 1.288 7.7 8.5

normal/low Nov-99 Focused Seaward 3496 5019 5986 6142 7089 7725 0.182 1.288 7.7 8.5

above normal/high Jan-03 Landward 554 1628 2268 2269 3212 3503 0.401 1.288 7.7 8.5

above normal/high Apr-03 Landward 927 1898 2684 2773 3564 4351 0.361 1.288 7.7 8.5

below normal/low Oct-03 Landward 1628 3712 5855 4720 8569 12650 0.150 1.288 7.7 8.5

below normal/high Jan-04 Landward 1256 1748 2981 2642 3808 6398 0.338 1.288 7.7 8.5

Appendix I

Table 3H Landward Insect-Eating Fish - High TTF/Se Diet (Blue)

33