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Coldwater River Backwater Restoration - Artificial Runoff Events
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Peak pesticide concentrations observed at the upstream end of the wetland during the 1 h injection period were 12.0, 6.7 and 0.82 mg/L atrazine, metolachlor and fipronil, respectively. Pesticide was rapidly removed from the water column with 63%, 51%, and 61% decrease in concentrations of atrazine, metolachlor and fipronil, respectively, within 24 h at the upstream end of the wetland. By day seven, 79%, 80%, and 87% decrease from peak concentrations of atrazine, metolachlor and fipronil, respectively were observed. After four weeks all pesticide concentrations were <0.300 mg/L, and after eight weeks no target pesticides were detected. Water samples collected at the downstream endof the wetland showed only atrazine occurring in trace amounts (<0.4 mg/L) within 24 h of injection and after four weeks was not detected. Metolachlor occurred in only a single downstream weir water sample on week three (0.249 mg/L) and fipronil was not detected until day 15 and occurred in only trace amounts (<0.05 mg/L) until the last sample on week eight.

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