# 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 0.0 0.2 0.4 0.6 0.8 1.0Frequency 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 

### 0.0 0.2 0.4 0.6 0.8 1.0Frequency 

### 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 YearAverage (ug/l) 0.0 0.2 0.4 0.6 0.8 1.0Frequency 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 0.1223-May2-Jun12-Jun22-Jun2-Jul12-Jul22-Jul1-Aug11-Aug21-Aug31-Aug10-Sep20-Sep30-Sep10-OctAzinphos-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 0.123-May2-Jun12-Jun22-Jun2-Jul12-Jul22-Jul1-Aug11-Aug21-Aug31-Aug10-Sep20-Sep30-Sep10-OctSimazine (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 6/17/2007Chlropyrifos (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 0.189-Mar19-Mar29-Mar8-Apr18-Apr28-Apr8-May18-May28-May7-Jun17-JunAzinphos-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 6/17/2007Imidan (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 6/17/2007Simazine (ug/l) Hood River at Footbridge Lower Neal Creek at mouth Middle Neal Creek Neal Creek above ag diversion Neal Creek below ag diversion