Pesticide Application Workshop

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Pesticide Application Workshop
OCTOBER 2007

• Pudding River Watershed
• Pesticide Monitoring
• 2005-2007 Findings
• Kevin Masterson
• Oregon Department of Environmental Quality
• [phone], ext. 260

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Pesticide Monitoring Overview

• What are we sampling for?
• Organophosphate (OP) insecticides and triazine
  herbicides
• Why sample for these?
• Current use products
• OP pesticides very toxic to aquatic life

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Spring 2005 2006 Pesticide Monitoring Activity

• Monitoring time frames and frequency
• Spring ? March June (weekly)
• Fall ? September November (3 x)
• 2005-2007 monitoring data comparison
  considerations
• Grab samples at times when application is
  likely to occur
• Results for 2007 include spring, but not fall
  samples

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Pudding Watershed Pesticide Monitoring Locations
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Pesticide Monitoring Locations

• Where were pesticide detections found?
• Zollner Boschler Creek Sites Very high
  number
• Little Pudding Moderately high number
• Pudding River Lower number
• - Abiqua Silver No detections

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Chloryprifos Acute WQS (0.083 ug/l)
Chloryprifos Acute WQS (0.083 ug/l)
Chloryprifos Acute WQS (0.083 ug/l)
Chloryprifos Acute WQS (0.083 ug/l)
Azinphos-methyl WQS (0.01 ug/l)
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Chloryprifos Acute WQS (0.083 ug/l)
Chlorpyrifos Chronic WQS (0.041)
Azinphos-methyl WQS (0.01 ug/l)
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Pudding Pesticide MonitoringTake Home Messages

• Multiple detections of chlorpyrifos over the
  chronic water quality standard, and median
  concentration of the detections has been very
  close to standard
• Guthion (azinphos-methyl) has not been detected
  since 2005 (!)
• No diazinon detections in 2005, but 10 or more
  detections in each of the subsequent years
• Moderate fluctuations in detection frequency and
  concentrations of most pesticides, but no
  discernable trends yet