Carbaryl Monitoring in Glassy-Winged Sharpshooter Treatment Areas, Chico

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Carbaryl Monitoring in Glassy-Winged Sharpshooter
Treatment Areas, Chico

• Johanna Walters and Kean S. Goh
• Department of Pesticide Regulation
• GWSS Public Information Meeting
• February 15, 2001
• Chico

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Outline

• Introduction
• Monitoring Objectives
• Sampling Sites
• Sampling Methods
• Results and Conclusions

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Introduction

• Department of Pesticide Regulation
• Independent monitoring
• Consultation
• Environmental data
• Urban environment

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Monitoring Objectives

• Obtain data on environmental concentration of
  Carbaryl to ensure
• human safety
• ecological safety
• proper application

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Sampling Sites

• Selection Criteria
• Sensitive areas
• human ecological
• Worst-case monitoring
• proximity to application
• highest amount used
• Highest frequency

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Sampling Sites
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Environmental Media

• Tank Mixture
• Air
• Surface Water
• Ground Water
• Foliage
• Fruits and Vegetables
• Fish

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Carbaryl Application
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Tank Mixture
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Air Monitoring
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Water Sampling
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Results Tank Mixture

• Location Date Sampled
  Concentration
• _________________________________________
• Whitman Ave 11/5/00 0.142
• Chico Mall
  0.151
• __________________________________________________
  ________________________________________________
• Label rate ranged 0.05 to 0.20

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Results Air

• Whitman Ave
• Four Intervals
• 1 hour before
• Duration of application plus 1 hour
• 24 hours after
• Another 24 hours
• No residue detected
• Health level 3,057 ppt

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Results Foliar
Location Date Sampled Concentration (ug/cm2)
Community Park 11/5/00 2.14
Chico Mall 11/5/00 3.79
Safe levels 5.6 ug/cm2
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Results Surface Water

• Sites
• Little Chico Creek
• Comanche Creek
• Sampling dates
• Prespray November 4,
• Postspray November 5,
• First Rain Event November 13
• No Carbaryl detected
• Minimum Detection Level 0.05 ppb

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Acknowledgments

• Consultants
• CDFG, NMFS, RWQCB, Co.Dept. of Ag.
• CDFA
• Collaborators
• Property Owners, Applicators
• Center for Analytical Chemistry
• C Cooper, J Hsu, J White, J Hernandez,
• H Feng, P Lee, D Tran
• DPR Field Staff
• Dave Kim, Dee Jones, Nina Bacey