Surface Water Monitoring Program for Pesticides in Salmonid-Bearing Streams, April to October, 2004. A Cooperative Study Conducted by the Washington State Departments of Ecology and Agriculture.

摘要

The Washington State Department of Agriculture (WSDA) and the Washington State Department of Ecology (Ecology) designed a three-year monitoring study to characterize pesticide concentrations in salmonid-bearing streams during the typical pesticide-use season. This report presents data from the second year, 2004, in the study. Two index watersheds, representing urban and agricultural land-use patterns, were sampled from March through October 2004. Thornton Creek in the Cedar-Sammamish watershed was chosen as the urban drainage. Marion Drain, Spring Creek, and Sulphur Creek Wasteway in the Lower Yakima watershed were chosen as the agricultural drainage. Five conventional water quality parameters--discharge, temperature, pH, conductivity, and total suspended solids--were measured to characterize water quality of the streams and to investigate pesticide fate and toxicity.