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Thiobencarb Monitoring Moves to Fifth and Sixth Weeks

Thiobencarb monitoring results report numbers at most sites on May 30 and June 4. The monitoring numbers exceeded the 1.5 µg/L (parts per billion) performance goal at the upper part of Colusa Basin Drain (CBD5) on May 30, and the lower part of the drainage (CBD1) May 30 and June 4. This now counts as seven exceedances of the performance goal into the sixth week of monitoring.

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Thiobencarb Fourth Week of Monitoring

Memorial Day weekend typically marks the fifth week of thiobencarb monitoring with peak use and numbers exceeding the 1.5 µg/L (parts per million) performance goal. For this atypical year, the holiday marked the fourth week of monitoring with numbers at all sites except the Sacramento River location. The monitoring results recovered to acceptable levels after a rough start where the performance goal was exceeded two and three weeks into the program.

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