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| Title | Quality Assurance Project Plan: Grayland Ditch: An Evaluation of Organophosphate Pesticides and Pesticide Test Kits | |||
| Month-Year Published | July 2009 | |||
| Online Availability |
467 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
This is the study plan for an Evaluation of Organophosphate Pesticides and Pesticide Test Kits at Grayland Ditch. (Also see abstract below) | |||
| Publication Number | 09-03-115 | |||
| Author(s) | Anderson, P. | |||
| Print Availability | ||||
| Number of pages | 32 pp. | |||
| Keywords | 303(d), county, Ecology, evaluation, Grays Harbor , Grays Harbor County, internet, Pacific County, pesticide, quality, quality assurance, quality assurance project plan, results, sampling, toxic, water, Willapa Bay | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Evaluation of Efforts to Reduce Pesticide Contamination in Cranberry Bog Drainage | similar topic | |||
| Pesticide Reduction Evaluation for Cranberry Bog Drainage in the Grayland Area | similar topic | |||
| Grayland Ditch: An Evaluation of Organophosphate Pesticides and Pesticide Test Kits | parent publication | |||
| Assessment of Cranberry Bog Drainage Pesticide Contamination | similar topic | |||
| Abstract | Long Description |
Each study conducted by the Washington State Department of Ecology (Ecology) must have an approved Quality Assurance Project Plan. The plan describes the objectives of the study and the procedures to be followed to achieve those objectives. After completion of the study, a final report describing the study results will be posted to the Internet. Between Grayland and North Cove along the Washington Coast, the Grayland Ditch is used to drain surface water and groundwater from cranberry growing operations and residential property. The Grayland Ditch is made up of two ditches: the Grays Harbor County ditch flowing north to Grays Harbor and the Pacific County ditch flowing south to Willapa Bay. Several Ecology studies have identified concentrations of three organophosphate pesticides (azinphos-methyl, chlorpyrifos, and diazinon) in water that did not meet water quality standards. Both ditches are currently on Washington State′s 303(d) list for exceeding water quality criteria or recommended standards for multiple toxic pollutants. To reduce pesticide levels in these drainages, local cranberry growers sponsored research and development of best management practices. After several years of design and implementation, Ecology conducted a study to evaluate the effectiveness of the best management practices. Results showed that there was some progress made, but concentrations of pesticides continued to exceed water quality standards during the growing season. This Ecology study will provide another evaluation of current concentrations of the three organophosphate pesticides. Sampling will be conducted during the peak pesticide application period during June and July 2009. In conjunction with laboratory samples, field organophosphate pesticide test kits will also be evaluated as a sampling tool. If effective, commercially available organophosphate pesticide test kits could be used by cranberry growers to identify areas of concern. |
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This page last updated August 17, 2011
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