By Michael S. Majewski and David S. Baston
U.S. GEOLOGICAL SURVEY
Water Resources Investigation Report 02-4100
Prepared in cooperation with the
California Regional Water
Quality Control Board, Central Valley Region
California
Department of Pesticide Regulation
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Weekly composite, bulk air was sampled with respect to wind speed and direction from January 1996 through December 1997 in one urban and two agricultural locations in Sacramento County, California. The sampling sites were located along a north-south transect, the dominant directions of the prevailing winds. The samples were analyzed for a variety of current-use pesticides, including dormant orchard spray insecticides and rice herbicides. A variety of pesticides were detected throughout the year, predominantly chlorpyrifos, diazinon, and trifluralin. The data obtained during the winter and spring suggest that some pesticides used in agricultural areas become airborne and may be transported into the urban area. Confirmation of this drift is difficult, however, because these three predominant pesticides, as well as other detected pesticides, also are heavily used in the urban environment. The spring data clearly show that molinate and thiobencarb, two herbicides used only in rice production, do drift into the urban environment.
Abstract
Introduction
Purpose and Scope
Acknowledgments
Sample Collection
Study Area Description
Sampling Site Description
Collection Procedure
Analytical Methodology
Sample Analysis
Gas Chromatography
Quality Control
Pesticide Recoveries
Laboratory Spike Samples
Collection Efficiency
Pesticide Detection Frequency
Pesticide Use Information
Herbicides
Insecticides
Fungicides
Conclusions and Summary
References Cited
Appendix 1. Sampling date, rainfall amount, sample volume, and pesticide air concentration for each
north and south sample taken at the Franklin Field Airport site, California
Appendix 2. Sampling date, rainfall amount, sample volume, and pesticide air concentration for each
north and south sample taken at the Sacramento Metropolitan area site, California
Appendix 3. Sampling date, rainfall amount, sample volume, and pesticide air concentration
for each north and south sample taken at the Sacramento International Airport site, California
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