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| Title | Pesticide Residues in the East Chehalis Surficial Aquifer/Pesticides in Ground Water-Report No. 5 | |
| Month-Year Published | January 1994 | |
| Online Availability |
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| Short Description |
Eleven wells near Chehalis, Washington, were sampled in March 1993 for 123 pesticides and nitrate+nitrite as nitrogen. Field measurements of water temperature, pH, and specific conductance were also made. Four pesticides were detected in the initial samples; atrazine, simazine, diuron, and dichlobenil. One or more of these chemicals were detected in three wells, however concentrations were below health related levels set by the EPA. (Also see abstract below) | |
| Publication Number | 94-26 | |
| Author(s) | Larson, A. | |
| Print Availability | ||
| Number of pages | 23 pp. | |
| Keywords | aquifer, chemical, drinking water, ground water, groundwater, nitrate, nitrite, nitrogen, pesticide, pesticides, pH, report , specific conductance, temperature, water, wells | |
| Abstract | Long Description |
Eleven wells near Chehalis, Washington, were sampled in March 1993 for 123 pesticides and nitrate+nitrite as nitrogen. Field measurements of water temperature, pH, and specific conductance were also made. Four pesticides were detected in the initial samples; atrazine, simazine, diuron, and dichlobenil. One or more of these chemicals were detected in three wells, however concentrations were below health related levels set by the EPA. Atrazine, simazine, and diuron were detected in verification samples collected on August 23, 1993, from the three wells. Dichlobenil was not detected although dichlorobenzamide, a suspected breakdown product of dichlobenil, was detected. One well had a nitrate+nitrite as nitrogen concentration greater than the 10 mg/L standard for public drinking water supplies. |
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