Selenium concentrations at the study areas sites for the Grassland Bypass Project in 1996 through 2001. Each concentration represents the level of selenium present in each grab sample collected for each toxicity testing period. All data in micrograms per liter (ug/L). Analysis was completed by BOR. (Key at bottom of table.)

 

Month Date Site Location
B C D F DMC
October

1996

10/8/96 65 <1 20 1 <1
10/10/96 62 <1 16 1 <1
10/12/96 72 <1 19 <1 <1
November

1996

11/12/96 59 <1 6.8 <1 <1
11/14/96 75 <1 8.9 <1 <1
11/16/96 69 <1 11.0 <1 <1
11/19/96 94 <1 12.0 <1 <1
December

1996

12/10/96 36 <1 5.2 <1 <1
12/12/96 54 <1 8.0 <1 <1
12/14/96 51 <1 5.0 2.2 <1
January

1997

1/7/97 37 <2 3.4 <2 <2
1/9/97 45 <2 4.4 <2 <2
1/11/97 48 <2 4.6 <2 <2
February

1997

2/4/97 58 <2 5.7 5.0 <2
2/6/97 66 <2 7.7 5.8 <2
2/8/97 89 <2 15 <2 <2
March

1997

3/11/97 110 <2 50 <2 <2
3/13/97 99 <2 49 <2 <2
3/15/97 95 <2 33 <2 <2
April

1997

4/15/97 130 2.7 100 <2 <2
4/17/97 130 <2 67 <2 <2
4/19/97 120 <2 69 <2 <2
May

1997

5/13/97 84 <2 64 <2 <2
5/15/97 79 <2 58 <2 <2
5/17/97 64 <2 47 <2 <2
5/20/97 64 <2 34 <2 <2
June

1997

6/10/97 46 <2 28 <2 <2
6/12/97 56 <2 37 <2 <2
6/14/97 75 <2 43 <2 <2
July

1997

7/8/97 44 <2 24 <2 <2
7/10/97 36 <2 34 <2 <2
7/12/97 32 <2 36 <2 <2
August

1997

8/5/97 30 <2 17 <2 <2
8/7/97 29 <2 31 <2 <2
8/9/97 37 <2 44 <2 <2
September

1997

9/9/97 18 <2 22 <2 <2
9/11/97 21 <2 15 <2 <2
9/13/97 25 <2 14 <2 <2
9/16/97 16 <2 7.2 <2 <2
October

1997

10/14/97 48 <2 10 <2 <2
10/16/97 58 <2 10 <2 <2
10/18/97 47 <2 12 <2 <2
November

1997

11/4/97 63 <2 18 <2 <2
11/6/97 60 <2 10 <2 <2
11/8/97 65 <2 12 <2 <2
December

1997

12/2/97 32 <2 3.6 <2 <2
12/4/97 32 <2 3.4 <2 <2
12/6/97 27 <2 5.9 <2 <2
January

1998

1/20/98 75 <2 3.7 <2 <2
1/22/98 92 <2 2.8 <2 <2
1/24/98 64 <2 2.6 <2 <2
February

1998

2/17/98 47 <2 7.1 4.6 <2
2/19/98 56 <2 8.2 5.3 <2
2/21/98 63 <2 9.2 3.5 <2
March

1998

3/10/98 96 <2 15

4.1

<2

3/12/98 100 <2 19

2.5

<2

3/14/98 99 <2 21

2.1

<2
April

1998

4/7/98 85 <2

31

<2

<2
4/9/98 120 <2

29

<2

<2
4/11/98 140 <2

42

<2

<2
May

1998

5/12/98 130

<2

78

<2

<2
5/14/98 130

<2

67

<2

<2
5/16/98 80

<2

33

<2

<2
June

1998*

6/9/98 88.4

1.01

62.2

0.67

0.78
6/11/98 97.6

0.81

42.8

0.66

0.52
6/13/98 89.6

1.10

29.8

0.82

0.47
July

1998

7/6/98 45.3

1.30

26.8

0.40

0.42
7/8/98 43.7

1.25

30.6

0.62

<0.40
7/10/98 47.3

1.19

31.0

<0.40

0.57
August

1998

8/10/98 54

2.0

35

1.1

1.1
8/12/98 51

2.0

31

1.1

0.5
8/14/98 37

1.4

30

1.2

<0.40
September

1998

9/8/98 52 1.1 28 1.2 0.8
9/10/98 43 0.9 37 1.0 <0.40
9/12/98 50 0.9 43 1.2 <0.40
October

1998

10/12/98 49 0.7 9.4 0.8 <0.4
10/14/98 37 0.6 8.1 1.1 0.4
10/16/98 46 0.6 10 1.0 <0.4
November

1998

11/10/98 47 0.6 7.8

1.0

<0.4
11/12/98 46 0.7 6.7

0.9

0.7
11/14/98 52 0.6 8.0 0.9 0.5
December

1998

12/07/98 50 0.5 6.3 0.8 0.5
12/09/98 79 0.6 7.5 0.8 0.5
12/11/98 56 0.5 8.7 0.8 0.6
January

1999

1/11/99 46 0.8 12 1.2 1.0
1/13/99 50 0.9 9.8 1.0 1.0
1/15/99 49 0.7 9.2 1.0 1.2
February

1999

2/8/99 57 0.7 11 1.1 0.6
2/10/99 60 0.8 17 1.0 0.8
2/12/99 66 0.8 11 1.0 0.6
March

1999

3/8/99 89 1.3 26 1.3 0.9
3/10/99 80 0.9 25 1.1 1.0
3/12/99 88 0.9 27 1.4 1.1
April

1999

4/5/99 94 1.2 45 1.2 1.0
4/7/99 133 1.3 40 1.1 0.8
4/9/99 88 1.4 36 1.5 0.7
May

1999

5/10/99 69 1.3 42 0.9 0.7
5/12/99 67 1.4 30 1.0 0.5
5/14/99 61 1.0 48 0.7 0.6
June

1999

6/14/99 44 1.2 34 1.0 <0.4
6/16/99 52 1.4 37 0.9 <0.4
6/18/99 54 1.4 43 0.7 0.5
July

1999

7/12/99 45 2.5 38 0.9 <0.4
7/14/99 38 1.9 28 0.9 <0.4
7/16/99 43 1.9 29 1.0 <0.4
August

1999

8/9/99 23 1.8 13 0.8 <0.4
8/11/99 18 0.9 16 0.7 <0.4
8/13/99 24 1.0 21 0.9 <0.4
September

1999

9/13/99 43 1.2 19 1.2 0.6
9/15/99 34 0.9 23 1.1 <0.4
9/17/99 43 1.0 22 1.3 <0.4
October

1999

10/11/99 30 0.8 8.1 0.9 0.7
10/13/99 29 0.5 6.4 0.8 <0.4
10/15/99 24 0.5 3.0 1.0 <0.4
November

1999

11/8/99 55 0.4 8.1 1.0 0.5
11/10/99 58 0.5 7.5 1.1 <0.4
11/12/99 36 0.6 5.4 1.0 <0.4
December

1999

12/13/99 54 0.8 9.0 1.0 0.5
12/15/99 40 0.7 9.7 0.9 0.6
12/17/99 72 <0.4 10 0.9 0.7
January

2000

1/3/00 77 0.8 7.8 0.6 <0.4
1/5/00 55 0.4 6.7 0.9 <0.4
1/7/00 76 0.5 8.4 0.8 <0.4

February

2000

2/7/00 66 0.8 16

0.7

0.6
2/9/00 72 <0.4 22

0.9

0.6
2/11/00 63 <0.4 17

0.9

0.5

March

2000

3/6/00 81 1.2 24 1.1 0.6
3/8/00 90 0.6 27 1.1 0.6
3/10/00 79 0.8 23 1.2 0.8

April

2000

4/3/00 87 1.8 36 2.2 <0.4
4/5/00 74 1.7 39 1.1 0.8
4/7/00 80 1.3 31 1.7 0.9

May

2000

5/1/00 85 1.6 55 1.6 0.6
5/3/00 74 1.6 55 1.3 <0.4
5/5/00 78 1.0 60 1.2 0.6

June

2000

6/12/00 54 1.3 40 1.2 1.1
6/14/00 43 2.1 28 1.2 0.8
6/16/00 37 2.2 34 1.1 0.8

July

2000

7/10/00 42 1.7 31 1.0 0.4
7/12/00 35 1.3 33 1.0 0.4
7/14/00 32 0.9 30 0.9 <0.4

August

2000

8/14/00 24 1.2 26 0.6 <0.4
8/16/00 23 1.0 20 0.6 <0.4
8/18/00 28 0.8 24 1.6 <0.4

September

2000

9/11/00 52 0.6 32 0.7 <0.4
9/13/00 45 0.5 21 0.6 <0.4
9/15/00 40 0.8 17 0.7 <0.4

October

2000

10/16/00 56 0.5 8.3 <0.4 <0.4
10/18/00 55 <0.4 7.4 0.5 <0.4
10/20/00 28 <0.4 3.9 <0.4 <0.4

November

2000

11/13/00 54 0.5 6.7 <0.4 <0.4
11/15/00 61 0.4 9.4 <0.4 <0.4
11/17/00 75 0.5 10 <0.4 <0.4

December

2000

12/11/00 51 0.5 9.8 0.5 0.5
12/13/00 51 0.6 8.1 0.7 <0.4
12/15/00 56 0.6 12 0.6 <0.4

January

2001

1/8/01 42 <0.4 11 0.4 <0.4
1/10/01 46 0.5 9.3 0.5 <0.4
1/12/01 47 <0.4 7.7 1.0 0.8

February

2001

2/12/01 65 0.8 17 0.6 <0.4
2/14/01 70 <0.4 20 0.8 <0.4
2/16/01 68 <0.4 19 0.4 <0.4

March

2001

3/12/01 88 2.9 18 1.2 1.0
3/14/01 85 1.3 20 1.3 1.0
3/16/01 93 1.0 22 1.2 0.5

April

2001

4/9/01 77 1.5 50 1.7 1.5**
4/11/01 74 1.7 32 1.5 <0.4
4/13/01 79 1.7 37 1.5 0.5

May

2001

5/14/01 65 0.7 32 0.8 <0.4
5/16/01 47 0.4 22 1.0 <0.4
5/18/01 52 0.5 35 0.6 <0.4

June

2001

6/11/01 52 1.0 43 0.6 0.6
6/13/01 53 0.5 53 0.7 <0.4
6/15/01 55 0.5 53 0.5 0.5

July

2001

7/09/01 37 0.7 33 0.6 <0.4
7/11/01 39 0.7 32 0.6 <0.4
7/13/01 35 0.6 30 0.7 <0.4

August

2001

8/13/01 32 0.9 35 0.6 <0.4
8/15/01 33 0.6 27 0.5 <0.4
8/17/01 32 1.3 25 0.4 <0.4

September

2001

9/10/01 53 0.5 20 <0.4 <0.4
9/12/01 56 0.5 24 <0.4 <0.4
9/14/01 29 <0.4 20 <0.4 <0.4

Key

DMC = Delta Mendota Canal
NT = Not tested
"-" = Future sample
BOR = US Bureau of Reclamation
* = New testing laboratory with precision to 0.40 ug/L                                                                                                                                                                         ** = Sample re-analyzed and result confirmed

 

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