Summary of Selenium concentrations in water samples collected at the study area sites for the Grassland Bypass Project between 2001 and 2009.  Each concentration represents the level of selenium present in each grab sample collected for each toxicity testing period. All data in micrograms per liter (µg/L). Analysis was completed by the United States Bureau of Reclamation -Pacific Region. (Key at bottom of table.)

Month Date Site Location
B C D F DMC
October

2001

 10/22/01 53 <0.4 7.3 <0.4 <0.4
10/24/01 51 0.4 7.8 <0.4 <0.4
10/26/01 30 <0.4 5.2 <0.4 <0.4
November

 2001

 11/26/01 44 <0.4 6.0 <0.4 <0.4
11/28/01 47 <0.4 5.2 <0.4 <0.4
11/30/01 49 <0.4 6.2 <0.4 0.5
December

 2001

 12/10/01 55 <0.4 8.2 <0.4 <0.4
12/12/01 45 <0.4 7.4 <0.4 <0.4
12/14/01 47 <0.4 8.4 <0.4 <0.4
January

 2002

 1/28/02 61 <0.4 13 <0.4 <0.4
1/30/02 56 <0.4 14 0.8 <0.4
2/1/02 66 <0.4 13 0.5 <0.4
February

 2002

 2/18/02 61 0.7 20 0.9 1.3
2/20/02 65 0.7 20 1.0 1.2
2/22/02 70 0.8 22 0.9 1.0
March

 2002

 3/25/02 78 <0.4 24 0.4 1.7*
3/27/02 77 <0.4 27 0.6 <0.4
3/29/02 81 <0.4 26 <0.4 <0.4
April

 2002

 4/22/02 62 0.6 52 0.7 0.4
4/24/02 78 0.8 37 0.8 0.4
4/26/02 70 0.7 48 0.7 <0.4
May 

2002

 5/20/02 52 0.7 38 0.5 <0.4
5/22/02 34 0.6 25 0.5 <0.4
5/24/02 46 0.8 27 0.5 <0.4
June

2002

 6/24/02 48 0.9 29 0.5 <0.4
6/26/02 48 0.8 38 0.7 <0.4
6/28/02 52 0.5 50 0.7 0.5

July 

2002

 7/22/02 30 0.5 22 0.5 0.5
7/24/02 32 0.8 17 0.4 <0.4
7/26/02 32 0.9 20 <0.4 <0.4
August

 2002

 8/19/02 28 0.7 21 0.5 <0.4
8/21/02 34 0.7 26 0.6 <0.4
8/23/02 45 0.7 26 0.5 <0.4
September

2002

 9/23/02 48 0.5 15 0.5 <0.4
9/25/02 44 0.5 11 <0.4 <0.4
9/27/02 48 <0.4 18 0.4 <0.4
October 

2002

 10/14/02 75 0.4 15 <0.4 <0.4
10/16/02 52 <0.4 7.0 <0.4 <0.4
10/18/02 57 <0.4 10 <0.4 <0.4
November 

2002

 11/18/02 55 0.5 7.6 <0.4 <0.4
11/20/02 67 0.4 7.6 0.5 <0.4
11/22/02 68 0.4 6.5 <0.4 <0.4
December 

2002

 12/16/02 78 0.4 12 0.8 0.6
12/18/02 72 <0.4 8.4 0.8 0.6
12/20/02 70 <0.4 9.9 0.7 1.0
January 

2003

 1/20/03 72 <0.4 11 <0.4 <0.4
1/22/03 54 <0.4 8.8 <0.4 <0.4
1/24/03 35 <0.4 5.8 0.5 <0.4
February 

2003

 2/17/03 57 1.2 18 1.1 <0.4
2/19/03 54 1.0 15 0.9 0.6
2/21/03 56 1.0 15 1.0 <0.4
March

2003

 3/17/03 74 0.7 20 1.3 0.9
3/19/03 84 0.7 20 1.2 <0.4
3/21/03 86 1.1 19 0.9 <0.4
April

2003

 4/14/03 75 1.2 35 1.2 <0.4
4/16/03 62 0.8 47 0.6 <0.4
4/18/03 62 0.9 35 0.8 <0.4
May

2003

 5/12/03 45 1.4 22 0.7 <0.4
5/14/03 57 1.0 34 1.1 <0.4
5/16/03 58 1.1 35 0.7 0.5
June

2003

 6/23/03 45 1.2 34 0.6 <0.4
6/25/03 41 1.1 28 0.5 <0.4
6/27/03 44 0.9 31 0.6 <0.4
July

2003

 7/21/03 28 1.2 17 0.5 <0.4
7/23/03 32 1.0 33 0.5 <0.4
7/25/03 32 1.2 23 0.6 <0.4
August

2003

 8/18/03 18 0.8 16 <0.4 <0.4
8/20/03 22 0.7 18 <0.4 <0.4
8/22/03 22 0.8 17 <0.4 <0.4
September

2003

 9/15/03 28 <0.4 10 <0.4 <0.4
9/17/03 36 0.5 7.9 <0.4 <0.4
9/19/03 31 0.5 10 <0.4 <0.4
October

2003

 10/13/03 64 0.4 10 <0.4 <0.4
10/15/03 65 <0.4 9.5 <0.4 <0.4
10/17/03 69 <0.4 11 <0.4 <0.4
November

2003

 11/10/03 51 <0.4 5.8 <0.4 <0.4
11/12/03 85 <0.4 8.8 <0.4 <0.4
11/14/03 56 <0.4 8.8 <0.4 <0.4
December

2003

 12/8/03 73 <0.4 10 <0.4 <0.4
12/10/03 63 <0.4 9.4 <0.4 <0.4
12/12/03 60 <0.4 7.9 <0.4 1.0
January

2004

 01/05/04 56 <0.4 8.0 0.5 <0.4
01/07/04 62 <0.4 6.0 0.4 <0.4
01/09/04 78 <0.4 10 <0.4 <0.4
February

2004

 02/02/04 70 0.5 18 0.9 1.3
02/04/04 48 0.5 11 1.0 <0.4
02/06/04 71 0.5 19 1.1 <0.4
March

2004

 

 03/01/04 65 0.8 11 1.0 1.3
03/03/04 77 0.8 14 1.0 1.4
03/05/04 70 0.8 14 1.0 1.4
April

2004

 

 04/12/04 68 1.0 45 0.8 0.6
04/14/04 65 1.2 35 0.8 1.1
04/16/04 73 0.8 53 0.8 <0.4
May

2004

 

 05/10/04 51 0.5 23 0.8 <0.4
05/12/04 44 0.6 23 0.6 <0.4
05/14/04 56 0.6 23 0.5 <0.4
June

2004

 

 06/07/04 49 0.8 39 0.7 <0.4
06/09/04 43 0.8 37 0.7 <0.4
06/11/04 52 0.5 44 0.7 <0.4
July

2004

07/19/04 35 0.9 21 0.5 <0.4
07/21/04 25 0.9 19 0.4 <0.4
07/23/04 35 0.7 21 <0.4 <0.4
August

2004

 

08/02/04 27 0.4 19 0.4 <0.4
08/04/04 30 0.5 26 0.5 <0.4
08/06/04 34 <0.4 21 0.4 <0.4
September

2004

 

09/13/04 39 <0.4 13 <0.4 <0.4
09/15/04 38 <0.4 17 <0.4 <0.4
09/17/04 39 <0.4 21 <0.4 <0.4
October

2004

 

10/11/04 24 0.5 5.4 0.5 <0.4
10/13/04 27 <0.4 4.2 <0.4 <0.4
10/15/04 22 <0.4 3.4 <0.4 <0.4
November

2004

 

11/8/04 52 <0.4 7.5 0.4 0.5
11/10/04 49 <0.4 9.3 0.4 <0.4
11/12/04 56 <0.4 9.5 0.4 <0.4
December

2004

 

12/6/04 44 <0.4 6.7 0.5 <0.4
12/8/04 40 0.4 7.5 0.5 <0.4
12/10/04 42 <0.4 6.3 0.5 0.9
January

2005

 

1/3/05 44 0.6 4.5 0.6 0.4
1/5/05 42 <0.4 4.8 0.5 <0.4
1/7/05 38 <0.4 4.4 1.1 0.5
February

2005

 

2/14/05 63 0.5 20 0.8 <0.4
2/16/05 67 0.6 16 0.8 0.5
2/18/05 32 0.6 8 0.8 1.1
March

2005

 

3/14/05 100 0.9 30 1.0 0.8
3/16/05 109 0.9 38 1.1 1.1
3/18/05 99 0.9 31 1.2 1.2
April

2005

 

4/11/05 77 1.1 16 1.0 0.5
4/13/05 69 0.8 25 0.8 0.5
4/15/05 75 1.1 25 0.7 0.5
May

2005

 

5/9/05 69 0.5 31 <0.4 <0.4
5/11/05 65 0.5 36 <0.4 <0.4
5/13/05 73 0.5 41 <0.4 <0.4
June

2005

 

6/6/05 38 0.6 12 <0.4 <0.4
6/8/05 31 0.5 14 <0.4 0.4
6/10/05 37 0.5 21 0.5 <0.4
July

2005

 

7/18/05 36 0.7 24 0.5 <0.4
7/20/05 36 1.0 19 0.4 <0.4
7/22/05 39 1.0 22 0.5 <0.4
August

2005

 

8/15/05 45 0.4 31 0.8 <0.4
8/17/05 38 0.6 31 0.5 <0.4
8/19/05 38 0.6 26 0.4 <0.4
September

2005

 

9/12/05 47 <0.4 29 0.6 <0.4
9/14/05 34 <0.4 10 0.5 <0.4
9/16/05 45 0.5 14 0.6 0.4
October

2005

 

10/10/05 40 <0.4 4.5 <0.4 <0.4
10/12/05 41 <0.4 5.1 <0.4 <0.4
10/14/05 35 0.5 4.2 <0.4 <0.4
November

2005

 

11/14/05 55 <0.4 6.3 <0.4 <0.4
11/16/05 27 <0.4 3.4 <0.4 <0.4
11/18/05 40 <0.4 4.2 <0.4 <0.4
December

2005

 

12/5/05 29 <0.4 3.6 0.4 <0.4
12/7/05 51 <0.4 7.4 <0.4 <0.4
12/9/05 48 <0.4 6.9 <0.4 <0.4
January

2006

 

1/16/06 79 <0.4 21 <0.4 <0.4
1/18/06 71 <0.4 20 <0.4 <0.4
1/20/06 69 <0.4 21 <0.4 <0.4
February

2006

 

2/13/06 53 0.5 21 0.7 0.4
2/15/06 49 <0.4 18 0.6 <0.4
2/17/06 38 0.4 17 0.9 0.6
March

2006

 

3/13/06 63 0.6 10 0.8 <0.4
3/15/06 55 0.6 10 0.8 <0.4
3/17/06 51 0.6 9.5 0.8 <0.4
April

2006

 

4/10/06 62.1 <0.4 9.2 <0.4 <0.4
4/12/06 58.2 0.5 11.2 <0.4 <0.4
4/14/06 61.2 0.4 11.4 <0.4 <0.4
May

2006

 

5/8/06 75 0.4 13 0.4 <0.4
5/10/06 67 0.5 9.4 <0.4 <0.4
5/12/06 65 0.4 15 <0.4 <0.4
June

2006

 

6/5/06 55 0.7 9.0 0.5 <0.4
6/7/06 55 0.6 9.6 0.4 0.5
6/9/06 52 0.8 10 0.5 0.7
July

2006

 

7/17/06 45 1.0 16 0.5 0.4
7/19/06 51 1.1 17 0.4 <0.4
7/21/06 43 1.0 23 0.5 <0.4
August

2006

 

8/14/06 53 0.7 26 0.7 <0.4
8/16/06 52 0.7 38 0.7 <0.4
8/18/06 45 0.8 20 0.6 <0.4
September

2006

 

9/11/06 32 0.6 9.2 0.5 <0.4
9/13/06 41 0.5 12 0.4 <0.4
9/15/06 34 <0.4 12 <0.4 <0.4
October

2006

 

10/23/06 76 0.4 5.9 0.4 <0.4
10/25/06 68 <0.4 4.4 0.5 0.5
10/27/06 69 <0.4 5.9 0.5 <0.4
November

2006

 

11/13/06 69 <0.4 7.9 0.5 <0.4
11/15/06 66 0.7 8.1 <0.4 0.6
11/17/06 65 0.5 6.3 0.4 0.6
December

2006

 

12/04/06 63 <0.4 6.8 <0.4 0.4
12/06/06 58 <0.4 8.0 <0.4 <0.4
12/08/06 58 <0.4 9.8 <0.4 <0.4
January

2007

 

1/15/07 63 0.4 9.9 0.5 0.7
1/17/07 72 <0.4 14 0.4 <0.4
1/19/07 50 0.4 12 0.5 <0.4
1/21/07 58 <0.4 15 0.6 <0.4
February

2007

 

2/12/07 58 0.7 13 0.9 1.4
2/14/07 54 0.7 13 0.7 1.2
2/16/07 57 0.6 12 0.8 1.2
2/20/07 46 0.5 14 0.9 <0.4
March

2007

 

3/12/07 39 0.6 4.8 0.7 0.4
3/14/07 43 0.5 6.4 0.7 0.5
3/16/07 47 0.6 7.2 0.8 0.6
April

2007

 

4/9/07 44 0.8 22 1.0 0.4
4/11/07 71 <0.4 48 0.8 <0.4
4/13/07 79 0.6 48 0.9 <0.4
May

2007

 

5/7/07 53 0.5 50 0.6 <0.4
5/9/07 59 0.8 45 0.6 <0.4
5/11/07 76 0.6 57 0.6 <0.4
5/14/07 50 0.5 28 0.6 <0.4
June

2007

 

6/4/07 37 0.7 24 0.9 <0.4
6/6/07 28 0.5 18 0.7 <0.4
6/8/07 34 0.8 14 0.8 <0.4
July

2007

 

7/16/07 29 0.8 16 0.4 <0.4
7/18/07 24 0.8 10 <0.4 <0.4
7/20/07 23 0.8