1

Early Spring Chlorpyrifos - Lower Neal Creek

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Chronic Chlorpyrifos WQS (0.041 ug/l)

Maximum

Early Spring Chlorpyrifos - Lenz Creek

0.000

0.020

0.040

0.060

0.080

0.100

0.120

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Chronic Chlorpyrifos WQS (0.041 ug/l)

Maximum

Early Summer Azinphos-Methyl - Lower Neal Creek

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Azinphos-methyl WQS (0.01 ug/l)

Maximum

Early Summer Azinphos-Methyl - Lenz Creek

0.000

0.020

0.040

0.060

0.080

0.100

0.120

0.140

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Azinphos-methyl WQS (0.01 ug/l)

Maximum

Late Summer Azinphos-Methyl - Lower Neal Creek

0.000

0.020

0.040

0.060

0.080

0.100

0.120

0.140

0.160

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Azinphos-methyl WQS (0.01 ug/l)

Maximum

Late Summer Azinphos-Methyl - Lenz Creek

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

0.400

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency Azinphos-methyl WQS (0.01 ug/l)

Maximum
2

Simazine - Lower Neal Creek

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

0.900

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency

Maximum

Simazine - Lenz Creek

0.000

0.200

0.400

0.600

0.800

1.000

1.200

1.400

1.600

1.800

2.000

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency

Maximum

Simazine - Middle Neal Creek

0.000

0.020

0.040

0.060

0.080

0.100

0.120

2000 2001 2002 2003 2004 2005 2006 2007

Year

Average (ug/l)

0.0

0.2

0.4

0.6

0.8

1.0

Frequency

Average Frequency

Maximum

2006 Hood River Basin Azinphos-Methyl Detections

0.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

0.11

0.12

23-May

2-Jun

12-Jun22-Jun

2-Jul

12-Jul22-Jul1-Aug

11-Aug21-Aug31-Aug

10-Sep20-Sep30-Sep

10-Oct

Azinphos-methyl (ug/L)

Baldwin Creek at end of Baldwin Rd. Evans Creek at bridge (Baseline Rd.) Hood River at footbridge

Lenz Creek at mouth Lower Neal Creek at mouth Middle Neal Creek 

Neal Creek above ag diversion Neal Creek below ag diversion

Azinphos-methyl WQS (0.01 ug/l)

2006 Hood River Basin Simazine Detections

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1

23-May

2-Jun

12-Jun22-Jun

2-Jul

12-Jul22-Jul1-Aug

11-Aug21-Aug31-Aug10-Sep20-Sep30-Sep

10-Oct

Simazine (ug/L)

Balwin Creek at end of Baldwin Rd. Evans Creek at bridge (Baseline Rd.) Hood River at footbridge

Lenz Creek at mouth Lower Neal Creek at mouth Middle Neal Creek 

Neal Creek above ag diversion Neal Creek below ag diversion

2007 Hood River Basin Spring Chlorpyrifos Detections

0.00

0.01

0.02

0.03

0.04

0.05

0.06

3/9/2007 3/19/2007 3/29/2007 4/8/2007 4/18/2007 4/28/2007 5/8/2007 5/18/2007 5/28/2007 6/7/2007 6/17/2007

Chlropyrifos (ug/l)

Hood River at Footbridge Lower Neal Creek at mouth Middle Neal Creek

Neal Creek above ag diversion Neal Creek below ag diversion

Chronic Chlorpyrifos WQS (0.041 ug/l)
3

2007 Hood River Basin Spring Azinphos-Methyl Detections

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

9-Mar

19-Mar29-Mar

8-Apr

18-Apr28-Apr

8-May

18-May28-May

7-Jun

17-Jun

Azinphos-methyl (ug/L)

Hood River at Footbridge Lower Neal Creek at mouth Middle Neal Creek

Neal Creek above ag diversion Neal Creek below ag diversion

2007 Hood River Basin Spring Imidan Detections

0.00

0.01

0.02

0.03

0.04

0.05

0.06

3/9/2007 3/19/2007 3/29/2007 4/8/2007 4/18/2007 4/28/2007 5/8/2007 5/18/2007 5/28/2007 6/7/2007 6/17/2007

Imidan (ug/l)

Hood River at Footbridge Lower Neal Creek at mouth Middle Neal Creek

Neal Creek above ag diversion Neal Creek below ag diversion

2007 Hood River Simazine Detections

0.00

0.05

0.10

0.15

0.20

0.25

3/9/2007 3/19/2007 3/29/2007 4/8/2007 4/18/2007 4/28/2007 5/8/2007 5/18/2007 5/28/2007 6/7/2007 6/17/2007

Simazine (ug/l)

Hood River at Footbridge Lower Neal Creek at mouth Middle Neal Creek

Neal Creek above ag diversion Neal Creek below ag diversion