  |
|
|
|
|
| Title | Pesticide Monitoring in the Mission Creek Basin, Chelan County | |||
| Month-Year Published | October 2002 | |||
| Online Availability |
678 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
| |||
| Short Description |
The report describes results of pesticide sampling in Mission Creek basin, a Wenatchee River tributary with its confluence at Cashmere. Objectives were to assess types and concentrations of pesticides in Mission Creek and its tributaries, and determine which drainages are contributing pesticides to Mission Creek. Concentrations of DDT, azinphos-methyl, and chlorpyriphos were at times above criteria to protect aquatic life from chronic exposure. In addition, DDT was above levels derived to protect human health from consumption of contaminated fish tissue. Other pesticides detected were endosulfan compounds, methoxychlor, diazinon, dimethoate, bromacil, dichlobenil, and atrazine. (Also see abstract below) | |||
| Publication Number | 02-03-022 | |||
| Author(s) | Serdar, S. and B. Era-Miller | |||
| Print Availability | ||||
| Number of pages | 35 pp. | |||
| Keywords | basin, county, creek, fish, Mission, monitoring, objectives, pesticide, river, soil, urban, Wenatchee River | |||
| Subject Waterbodies |
| |||
| Related Publications | Title | Relationship | ||
| Quality Assurance Project Plan: Pesticide Monitoring in the Mission Creek Basin | similar topic | |||
| Abstract | Long Description |
The Washington State Department of Ecology monitored pesticide concentrations in streams within the Mission Creek basin on five occasions from April through October, 2000. Several chlorinated insecticides, organophosphorous insecticides, and nitrogen herbicides were found in three creeks located within or downstream of agricultural and urban areas. No pesticides were found at a site located in the Wenatchee National Forest upstream of agricultural and urban areas, except for a single detection of azinphos-methyl. DDT (and metabolites DDE, DDD, and DDMU), endosulfan compounds, azinphos-methyl, and chlorpyriphos were detected in most samples. Methoxychlor, diazinon, dimethoate, bromacil, dichlobenil, and atrazine were detected much less frequently, generally in only one instance each. No carbamates or chlorophenoxy herbicides were found in any samples. Concentrations of azinphos-methyl (0.001 - 0.043 ug/l), chlorpyriphos (0.001 - 0.047 ug/l), and DDT compounds (0.001 - 0.048 ug/l) were, at times, above criteria to protect aquatic life from chronic exposure. In addition, DDT was above levels derived to protect human health from consumption of contaminated fish tissue. Azinphos-methyl and chlorpyriphos concentrations appear to closely follow seasonal use patterns. Endosulfan concentrations seem to reflect both its current seasonal use and historic use, while DDT concentrations appear to be related to delivery of contaminated soils to streams. Investigating mechanisms of pesticide transport to streams is recommended as a high priority for follow-up sampling. |
||
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
