Addendum to QA Project Plan for Surface Water Monitoring Program for Pesticides in Salmonid Bearing Streams: Additon of Skagit-Samish Watershed, and Extension of Program through June 2009.

摘要

The Washington State Department of Agriculture (WSDA) and the Washington State Department of Ecology (Ecology) designed a multi-year monitoring study to characterize pesticide concentrations in salmonid-bearing streams during the typical pesticide use season. The first phase of monitoring was conducted during 2003-2005 in two watersheds representing urban and agricultural land use patterns. Thornton Creek in the Cedar-Sammamish watershed (WRIA 8) was chosen as the urban drainage. Marion Drain, Spring Creek, and Sulphur Creek Wasteway in the Lower Yakima watershed (WRIA 37) were selected to represent agricultural land use. Data from the monitoring program will be used to develop accurate pesticide exposure assessments for ESA-listed salmonid species. This data will be provided to EPA and NOAA-Fisheries for ESA consultations on pesticides and salmon. WSDA will use the data for pesticide registration decisions and may apply data to determine if pesticide mitigation efforts are successful. This Quality Assurance (QA) Project Plan addendum is designed to add a western Washington agricultural drainage, the Lower Skagit-Samish watershed (WRIA3), to the monitoring program and extend existing project QA through June 2009. This addendum describes changes to the program. Items not specifically addressed in the addendum are governed by the original QA Project Plan (Johnson and Cowles, 2003).